Including Specific Optical Elements Patents (Class 398/201)
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Patent number: 7974542Abstract: An OTDM-DPSK signal generator includes an optical splitter, a first and a second phase modulator, an optical coupler, and a monitor signal splitter. The optical splitter splits an optical pulse string into a first and a second optical pulse string. The first and second phase modulators generate a first and a second channel DPSK signal, respectively. The DPSK signals are provided with one bit delay to generate another DPSK signal, which enters the optical coupler, which outputs an OTDM-DPSK signal, which enters a monitor signal splitter. The monitor signal splitter splits from the OTDM-DPSK signal a monitor signal and inputs the monitor signal to an optical carrier phase difference detector. The detector generates an optical carrier phase difference detection signal as a function of an optical carrier phase difference between optical pulses. The optical carrier phase difference can thus be detected between optical pulses in an OTDM-DPSK signal.Type: GrantFiled: September 27, 2007Date of Patent: July 5, 2011Assignee: Oki Electric Industry Co., Ltd.Inventor: Masatoshi Kagawa
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Patent number: 7965949Abstract: A robustly stabilized communication laser can output a multimode optical signal remaining aligned to a coordinate of a dense wavelength division multiplexing (“DWDM”) grid while responding to a fluctuating condition or random event, such as, without limitation, exposure to a temperature fluctuation, stray light, or contamination. Responsive to the fluctuating condition, energy can transfer among individual modes in a plurality of aligned longitudinal modes. Modes shifting towards a state of misalignment with the DWDM coordinate can attenuate, while modes shifting towards a state of alignment can gain energy. Fabrication processes and systems and light management, such as beam steering, epoxy scaffolds, spectral adjustments, mode matching, thermal expansion control, alignment technology, etc. can facilitate nano-scale control of device parameters and can support low-cost fabrication.Type: GrantFiled: June 12, 2009Date of Patent: June 21, 2011Assignee: Cirrex Systems LLCInventor: Michael L. Wach
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Patent number: 7962044Abstract: An optical transmitter is disclosed having a temperature stabilization system for an optical filter for maintaining constant the frequency response of the filter. The filter is mounted within a housing having a substantially higher thermal conductivity. The housing may include a copper-tungsten alloy and extend along the optical axis of the filter. The housing is in thermal contact with a thermo-electric cooler (TEC) and a temperature sensor. The TEC and temperature sensor are electrically coupled to a controller which adjusts the temperature of the TEC according to the output of the temperature sensor.Type: GrantFiled: February 4, 2008Date of Patent: June 14, 2011Assignee: Finisar CorporationInventors: Kevin McCallion, Michael Deutsch, Parviz Tayebati, Saeid Azemati
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Patent number: 7962045Abstract: An optical transmitter is disclosed including a widely tunable laser coupled to a periodic optical spectrum reshaper (OSR) to convert frequency modulated pulses from the laser into amplitude modulated pulses. The laser is tuned to generate pulses corresponding to passbands of the OSR spanning a wide range of frequencies. The laser includes a gain section having an optical path length substantially shorter than the total optical path length of the laser. The laser may be a Y-branch laser having reverse-biased sampled gratings or ring resonator filters tuned by stripe heaters. The laser may also include a reflective external cavity section tunable by modulating the temperature of ring resonators or etalons. The OSR may be integrally formed with the external cavity of the ECL laser.Type: GrantFiled: December 26, 2007Date of Patent: June 14, 2011Assignee: Finisar CorporationInventors: Kevin John McCallion, Yasuhiro Matsui, Daniel Mahgerefteh
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Patent number: 7962041Abstract: The infrared LED of an IrDA module transmits IR energy with a peak wavelength (for example, 875 nm) appropriate for IrDA communication. This peak wavelength is lower than is the wavelength (for example, 940 nm) used in ordinary IR remote controls (RC). The IrDA LED does, however, transmit some energy at the wavelength of the peak sensitivity of an RC receiver. When making an IrDA transmission, the IrDA LED is driven with a lower amount of current. When making an RC transmission, the IrDA LED is driven with an increased amount of current such that higher wavelength emissions received by the RC receiver are of adequate power to realize RC communication. A passive circuit is disclosed for automatically increasing IrDA LED current during RC transmissions. The circuit involves an inductor that shunts current around a current-limiting resistor used to limit LED drive current.Type: GrantFiled: April 9, 2010Date of Patent: June 14, 2011Assignee: IXYS CH GmbHInventor: Alan Grace
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Patent number: 7962043Abstract: A system and method are provided for controlling time delay in a multichannel optical transport network transmission device. The method accepts a pair of 2n-phase shift keying (2nPSK) modulated signals via Ix and Qx electrical signal paths, where n>1, and a pair of 2p-PSK modulated signals via Iy and Qy electrical signal paths where p>1. A voltage V1 on the Ix signal path is compared with a voltage V2 on the Qx signal path, and a VOx voltage in generated, which is minimized by adjusting time delay modules in the Ix and Qx signals paths. Likewise, a voltage V3 (Iy) is compared with a voltage V4 (Qy), and a VOy voltage is generated and minimized. Subsequent to minimizing VOx and VOy, the sum of V1 and V2 (V12) is compared with the sum of V3 and V4 (V34), and a VOxy voltage is generated and minimized.Type: GrantFiled: June 20, 2008Date of Patent: June 14, 2011Assignee: Applied Micro Circuits CorporationInventors: Keith Conroy, Omer Acikel, Francesco Caggioni
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Patent number: 7957642Abstract: Transport network interfaces operate to transport for Optical Transport Unit frames over an Optical Transport Network. Besides FEC bits for the Optical Transport Unit frames, the transmitting transport network interface provides sequences of error-determining bits for the Optical Transport Unit frames sent on working and protection communications channels. There is at least one sequence for each Optical Transport Unit frame, the number of bits in the at least one sequence much smaller than the number of bits in the Optical Transport Unit frame. The receiving transport network interface determines the bit error rates for the working and protection channels from the sequences of error-determining bits without decoding said Forward Error Correction bits and can select the working and protection channels accordingly.Type: GrantFiled: April 26, 2007Date of Patent: June 7, 2011Assignee: Cisco Technology, Inc.Inventor: Gilberto Loprieno
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Publication number: 20110110665Abstract: An AR coated quantum dot resonator implementing a wavelength independent light source to resolve a drawback of degradation in the property of a high temperature optical output due to AR coating of LED or wavelength locked light source, which is filtered to a narrow line width, is disclosed. In one embodiment, a gain medium includes at least one quantum dot and an anti-reflection (AR) coated reflection plane at one of front and rear planes of the gain medium. The gain medium has a wide line width due to different sizes and distribution of a plurality of quantum dots. The line width includes entire wavelength channels of a WDM or WDM-PON. Also, the AR coated reflection plane is a front reflection plane having a lower reflectivity (e.g., 0.001% to 1%.) than that of a rear reflection plane.Type: ApplicationFiled: November 9, 2010Publication date: May 12, 2011Inventor: Hee Yeal RHY
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Patent number: 7933524Abstract: Provided are an apparatus for and a method of generating millimeter waves, in which millimeter-wave generation and frequency up-conversion can be achieved at the same time using a single device. The apparatus includes a mode-locking laser diode (LD) which has a distributed feedback (DFB) sector and a gain sector and generates high-frequency optical pulses through a passive mode locking process, a modulator which modulates an external optical signal using an electric signal and injects the modulated optical signal to the mode-locking LD to lock the optical pulses, and a radio frequency (RF) locking signaling unit which injects the electric signal to the modulator.Type: GrantFiled: August 8, 2006Date of Patent: April 26, 2011Assignees: Electronics and Telecommunications Research Institute, Industry-Academic Cooperation Foundation, Yonsei-UniversityInventors: Kyung Hyun Park, Young Ahn Leem, Kwang Hyun Lee, Woo Young Choi
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Patent number: 7925172Abstract: An optical transmitter is disclosed wherein a directly modulated laser outputs a frequency modulated signal through a semiconductor optical amplifier. Both the optical transmitter and semiconductor amplifier are modulated according to an output of a digital data source. An optical filter is positioned to receive an output of the semiconductor optical amplifier and has a frequency dependent transmission function effective to convert the amplified signal into a filtered signal having enhanced amplitude modulation. In some embodiments, the semiconductor optical amplifier is coupled to the digital data source by means of a compensation circuit configured to high-pass filter the output of the digital signal source. In other embodiments, the semiconductor optical amplifier is coupled to the digital data source by means of a compensation circuit configured to produce an output including a first-order time derivative of the output of the digital signal source.Type: GrantFiled: July 31, 2008Date of Patent: April 12, 2011Assignee: Finisar CorporationInventors: Nils Anders Olsson, Daniel Mahgerefteh
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Patent number: 7925171Abstract: An optical transmission apparatus according to the present invention comprises: a plurality of optical modulating sections serially connected to each other via optical fibers; driving sections corresponding to the optical modulating sections; delay amount varying sections that provide variable delay amounts for modulating signals to be input to the driving sections, to adjust timing between drive signals to be provided for the optical modulating sections; temperature monitoring sections that monitor the temperature of each of the optical fibers and the like; and a delay amount control section that controls the delay amount in each of the delay amount varying sections based on the monitored temperatures.Type: GrantFiled: November 30, 2006Date of Patent: April 12, 2011Assignees: Fujitsu Limited, Yokogawa Electric CorporationInventors: Hiroki Ooi, George Ishikawa, Daisuke Tanimura, Hirotoshi Kodaka
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Patent number: 7917041Abstract: A small-scale VOA system includes a polarization rotator, a voltage multiplier circuit, and at least one transistor. The polarization rotator can be positioned within a TOSA along the emission axis of a corresponding optical signal source in addition to one or more polarizers. A microcontroller provides a first low voltage control signal to a voltage multiplier to generate a large voltage DC signal which is provided to the transistor. The transistor modulates the large voltage signal with a second control signal from the microcontroller to generate a large voltage AC signal for driving the polarization rotator. The polarization rotation of the polarization rotator can be altered depending on the applied large-voltage AC signal. As a result, the polarization rotator and one or more polarizers can variably attenuate signals emitted by the optical signal source or act as a shutter.Type: GrantFiled: February 20, 2008Date of Patent: March 29, 2011Assignee: Finisar CorporationInventors: Henry M. Daghighian, Kevin J. McCallion
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Patent number: 7903980Abstract: Provided herein are embodiments of a device, method of use and system for a low-cost analog multi-wavelength video distribution transamplifier for CATV and FTTH networks having a broadband overlay. The transamplifier embodiments described herein allow the use of multiple wavelengths to segment logical service groups in a CATV distribution system and a FTTH system having a broadband overlay. Improved optical signal power performance can be achieved by using direct modulating transmitters and modulating the optical signal for with an external waveguide, thereby decreasing SBS and reducing non-linearities.Type: GrantFiled: June 19, 2007Date of Patent: March 8, 2011Inventors: Fernando X. Villarruel, Steven C. Condra, Yihong Chen, Kevin L. Sweeney, James W. Sulhoff
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Patent number: 7899338Abstract: A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure.Type: GrantFiled: March 26, 2004Date of Patent: March 1, 2011Assignee: Sumitomo Osaka Cement Co., Ltd.Inventors: Yoshihiro Hashimoto, Junichiro Ichikawa, Kaoru Higuma, Takahisa Fujita
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Patent number: 7894726Abstract: A semiconductor chip on which a light receiving element is mounted, a preamplifier for amplifying an output signal from the light receiving element, and an insulating carrier substrate on which the light receiving element is mounted are connected such that the output signal from the light receiving element is input to the preamplifier through electrodes on the carrier substrate, and there are provided two electrodes, on the carrier substrate, having a capacitance value of 40 fF or more therebetween in a state where no light receiving element is mounted.Type: GrantFiled: June 13, 2006Date of Patent: February 22, 2011Assignee: Opnext Japan, Inc.Inventors: Osamu Kagaya, Yukitoshi Okamura, Atsushi Miura, Michihide Sasada, Hideyuki Kuwano
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Patent number: 7894725Abstract: A time-multiplexed waveform generator includes a wavelength splitter that receives an input optical signal and spectrally separates the input optical signal into a plurality of frequency components. A plurality of intensity modulators receives each of the frequency components and passes each of the frequency components for a selective time period, and then extinguishes that frequency for the remainder of a chirp time, the plurality of intensity modulators producing a plurality of first output signals. A plurality of adjustable delay lines is positioned after the intensity modulators and receives the first output signals. Each of the adjustable delay lines enables phase control of each of the frequency components associated with the first output signals for compensating any relative drifts of the path lengths and phase coherently stitching a plurality of sub-chirps together. The adjustable delay lines produce a plurality of second output signals.Type: GrantFiled: September 28, 2007Date of Patent: February 22, 2011Assignee: Massachusetts Institute of TechnologyInventors: Kevin W. Holman, David G. Kocher, Jae H. Kyung, Leaf A. Jiang, Sumanth Kaushik, Richard M. Heinrichs
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Patent number: 7885550Abstract: The invention provides an optical transmitter comprising a differential encoder having first and second outputs, the first and second outputs being of opposite polarity to one another, a first RZ converter connected to the first output of the differential encoder and a second RZ converter connected to the second output of the differential encoder, and a dual electrode Mach Zehnder modulator to which an unmodulated coherent light source is coupled, wherein the output of the first RZ converter is connected to a first electrode of the Mach Zehnder modulator and the output of the second RZ converter is connected to a second electrode of the Mach Zehnder modulator. The invention provides improved signal integrity as compared with existing RZ-DPSK solution through the use of high quality RZ drivers. Furthermore, the invention gives rise to controllable RZ pulse edge chirping, providing rapid pulse compression or broadening through a dispersive fibre length.Type: GrantFiled: July 15, 2004Date of Patent: February 8, 2011Assignee: Xtera Communications Ltd.Inventor: Richard Oberland
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Publication number: 20110026937Abstract: To reduce a size of an optical communication module.<br></br> There is provided an optical communication module 1, which includes a photoelectric conversion element package 10 to which a photoelectric conversion element 12 of either one of a light emitting element and a light receiving element is fitted so as to face one side 11a of a resin base 11, and an optical fiber coupler 20 having a light transmission hole 20c for coupling with an optical fiber in cylindrical portions 20a and 20b and mounted on the one side 11a of the resin base 11, where the photoelectric conversion element 12 and the light transmission hole 20c formed in the optical fiber coupler 20 are assembled aligned with an optical axis K.Type: ApplicationFiled: December 9, 2008Publication date: February 3, 2011Inventor: Takahito Saitou
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Publication number: 20110026936Abstract: To reduce optical axis misalignment in an optical communication module, the optical communication module 1 includes a photoelectric conversion element package 10 to which a photoelectric conversion element 12 of either one of a light emitting element and a light receiving element is fitted so as to face one side 11a of a resin housing 11, and an optical fiber coupler 20 mounted on the one side 11a of the resin housing 11 so as to be coupled with an optical fiber, in which the optical fiber 20 coupler includes a metal lens-holding plate 22 holding a lens 23 arranged opposite to the photoelectric conversion element 12, and a resin lens-holding frame 21 that is mounted on the one side 11a of the resin housing 11 and that houses the lens 23 held on the metal lens-holding plate 22 in a light transmission hole 21a1 formed therein, so that the lens 23 is aligned with an optical axis K of the photoelectric conversion element 12.Type: ApplicationFiled: December 15, 2008Publication date: February 3, 2011Inventor: Takahito Saitou
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Patent number: 7881618Abstract: System and method for m-ary phase shifting keying modulation. According to an embodiment, the present invention provides a method for performing m-ary phase-keying shift modulation. The method includes providing at least a first signal and a second signal by a signal source. The first signal and the second signal are characterized by a first signal strength level. The method also includes attenuating the second signal to provide a third signal. The second signal are characterized by a second signal strength level which is at approximate 50% of the first signal strength level. The method additionally includes coupling the first signal to a first bias voltage to provide a fourth signal. Furthermore, the method includes coupling the third signal to a second bias voltage to provide a fifth signal. The method also includes a step for providing a sixth signal by combing the fourth signal and the fifth signal.Type: GrantFiled: June 7, 2007Date of Patent: February 1, 2011Assignee: Huawei Technologies Co., Ltd.Inventors: Cishuo Yan, Xinyu Xu, Zhihui Tao
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Patent number: 7877021Abstract: In a pulse generator of very high resolution phase and/or intensity profiles, an active mode-locking laser source (1) emits a first train of optical pulses according to a determined period (To), which is intensity-modulated pulse-by-pulse by a modulator (2). The modulated pulses are transmitted to an optical loop (3) via a coupler (4). The optical length of the optical loop is slightly different from the period (To) of the source. The modulated pulses are transmitted to input B of the coupler. The optical loop connects output D to input A of the coupler. This coupler is commanded such that, according to a first command (k=0), it transmits the light received on its two inputs A, B towards output d, and according to a second command (K=1), it transmits the light received on its input (A) towards output (C).Type: GrantFiled: August 9, 2005Date of Patent: January 25, 2011Assignee: Commissariat a l'Energie AtomiqueInventor: Alain Jolly
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Patent number: 7869717Abstract: In the present invention, the extremely complicated setting and control and an extremely expensive optical component (wavelength locker) are not required, and optical output wavelength and optical output power can simply be set and controlled at a moderate price. At least one value for determining a dependence of the optical output wavelength on drive current and device temperature and at least one value for determining a dependence of the optical output power on drive current and device temperature in a light emitting device constituting first means 1 for emitting light are stored in fourth means 4.Type: GrantFiled: February 2, 2006Date of Patent: January 11, 2011Assignee: Nippon Telegraph and Telephone CorporationInventors: Shingo Kawai, Kiyoshi Matsumoto, Hideo Kawata, Naoto Yoshimoto, Katsumi Iwatsuki
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Patent number: 7865086Abstract: Regardless of a transmission basis, a phase of a signal light with reference to a phase of local light is measured, and an output light from an antisqueezed light source in a transponder device is modulated in accordance with the measured phase. Since information obtainable in the transponder device is only the relative phase of the signal light with reference to the phase of the local light, and includes fluctuations corresponding to an antisqueezed component of the signal light, even if the information in the transponder device is eavesdropped on, the information cannot be decoded easily.Type: GrantFiled: October 4, 2007Date of Patent: January 4, 2011Assignee: Hitachi, Ltd.Inventor: Tatsuya Tomaru
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Patent number: 7860404Abstract: An optical transmitter is discloses having a gain section and a phase section. The phase section is modulated to generate a frequency modulated signal encoding data. The frequency modulated signal is transmitted through an optical spectrum reshaper operable to convert it into a frequency and amplitude modulated signal. In some embodiments, a driving circuit is coupled to the phase and gain sections is configured to simultaneously modulate both the phase and gain sections such that the first signal is both frequency and amplitude modulated.Type: GrantFiled: March 12, 2008Date of Patent: December 28, 2010Assignee: Finisar CorporationInventors: Yasuhiro Matsui, Kevin McCallion, Daniel Mahgerefteh, Xueyan Zheng, Parviz Tayebati
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Patent number: 7860403Abstract: The invention includes a method for optically encoding data for transmission over a wavelength division multiplexed optical communications system comprising the steps of: generating a periodic series of optical pulses defining a series of time slots, wherein one pulse appears in each time slot; filtering the pulses to produce carrier pulses extending over more than one time slot; and modulating the pulses with data for transmission. Preferably, the filter gives rise to the pulses having a temporal profile with a minimum in the centre of each of the time slots adjacent to the time slot for that pulse. The resulting data format allows for greater spectral efficiency in a WDM optical transmission system as compared with conventional RZ and NRZ data formats.Type: GrantFiled: April 16, 2004Date of Patent: December 28, 2010Assignee: Xtera Communications Ltd.Inventors: Sergei Turitsyn, Mickail Fedoruk, Elena G Shapiro
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Publication number: 20100324736Abstract: A robot cleaner system is described including a docking station to form a docking area within a predetermined angle range of a front side thereof, to form docking guide areas which do not overlap each other on the left and right sides of the docking area, and to transmit a docking guide signal such that the docking guide areas are distinguished as a first docking guide area and a second docking guide area according to an arrival distance of the docking guide signal. The robot cleaner system also includes a robot cleaner to move to the docking area along a boundary between the first docking guide area and the second docking guide area when the docking guide signal is sensed and to move along the docking area so as to perform docking when reaching the docking area.Type: ApplicationFiled: June 15, 2010Publication date: December 23, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Kyung Hwan Yoo, Jae Man Joo, Dong Won Kim, Jun Hwa Lee, Jun Pyo Hong, Woo Ram Chung, Jae Young Jung, Hwi Chan Jang, Jang Youn Ko, Jeong Gon Song, Sam Jong Jeung
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Patent number: 7848662Abstract: A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of light which travel on first and second optical paths, respectively. A first reflector being disposed on the first optical path reflects the first split beam of light toward the half mirror. The second reflector being disposed on the second optical path reflects the second split beam of light toward the half mirror. At least one phase compensator being disposed between the half mirror and at least one of the first and second reflectors includes a medium that exhibits thermooptic effect and has temperature dependency of refractive index. The half mirror couples the first and second split beams of light to generate at least first and second coupled beams of light.Type: GrantFiled: May 3, 2007Date of Patent: December 7, 2010Assignee: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Morio Wada, Hiroyuki Matsuura, Akira Miura
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Patent number: 7848655Abstract: The present invention relates to advances in the field of reconfigurable optical networks. In particular, the present invention provides improvements in the technology of light sources for use in optical networks. The optical network according to the present invention includes a single light source that can be used to emit all of the bands and channels needed for transmission. In particular, the single light source in the optical network of the present invention is a mode-locked laser.Type: GrantFiled: August 27, 2004Date of Patent: December 7, 2010Assignees: Telcordia Technologies, Inc., University of Central FloridaInventors: Shahab Etemad, Peter Delfyett
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Patent number: 7844188Abstract: A light collecting device is disclosed that is able to couple light from a light emission structure to an optical fiber at low loss.Type: GrantFiled: September 19, 2007Date of Patent: November 30, 2010Assignee: Fujitsu LimitedInventor: Kazuya Takemoto
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Publication number: 20100296820Abstract: A system such as a server (100) dynamically aligns multiple free-space optical communication signals. One system embodiment includes a first array (114) in a first subsystem (110) and a second array (116) in a second subsystem (110). The first array (114) contains transmitters that produce optical signals that are transmitted through a first lens (220), free space, and a second lens (270) to the second array (116). The second array (116) contains receivers, and the first and second lenses (220, 270) constitute a telecentric lens that forms an image of the first array (114) on the second array (116). Mounting systems (230, 280) attach the first and second lenses (220, 270) respectively to the first and second subsystems (110), and at least one of the mounting systems (230, 280) dynamically moves the attached lens (220, 270) or another optical element (210, 260) to maintain image alignment.Type: ApplicationFiled: January 31, 2008Publication date: November 25, 2010Inventors: Huei Pei Kuo, Robert G. Walmsley
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Patent number: 7825366Abstract: Methods and systems for extracting energy from a heat source using photonic crystals with defect cavities generally comprise a photonic crystal, a cavity, and a converter. The photonic crystal is responsive to a heat source and generates an electromagnetic beam in response to incidence with the heat source. The photonic crystal exhibits a band gap such that wavelengths within the band gap are substantially confined within the photonic crystal. The cavity is substantially within the crystal and is responsive to the electromagnetic beam such that the cavity transmits the electromagnetic beam to a specified location. The converter is substantially collocated with the specified location and extracts energy in response to incidence with the electromagnetic beam.Type: GrantFiled: September 11, 2008Date of Patent: November 2, 2010Assignee: Raytheon CompanyInventors: Delmar L. Barker, William R. Owens, Abram G. Young
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Patent number: 7826751Abstract: A bi-directional signal interface includes a first waveguide that propagates a first traveling wave. The first waveguide has one end that is coupled to a RF input port that receives a RF transmission signal and another end that is coupled to a RF bi-directional port that receives a RF reception signal and that transmits the RF transmission signal. A second waveguide is positioned proximate to the first waveguide. The second waveguide has one end that is coupled to an output port that passes the received RF reception signal. A non-reciprocal coupler couples fields from the first waveguide to the second waveguide so that the RF reception signal from the bi-directional port couples from the first waveguide to the second waveguide in a substantially non-reciprocal manner and then passes through the output port, and the RF transmission signal from the RF input port passes through the first waveguide to the RF bi-directional port.Type: GrantFiled: June 12, 2009Date of Patent: November 2, 2010Assignee: Photonic Systems, Inc.Inventors: Charles Cox, Edward Ackerman
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Publication number: 20100266295Abstract: Embodiments of a system are described. This system includes an array of chip modules (CMs) that are configured to communicate data signals with each other via optical communication. In a given CM module, optical signal paths, such as waveguides, are routed in the same way as in the other CMs in the array. In this way, a common optical design in the CMs may be used in the system to prevent data conflicts during the optical communication.Type: ApplicationFiled: December 21, 2007Publication date: October 21, 2010Applicant: SUN MICROSYSTEMS, INC.Inventors: Xuezhe Zheng, Ashok V. Krishnamoorthy, John E. Cunningham
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Patent number: 7817922Abstract: Provided are an apparatus and a method for generating a CS-RZ optical signal. The apparatus includes: a classifier distributing an input signal into two NRZ (non-return-to-zero) signals with an identical transmission speed; a first signal transformer converting one of the two NRZ signals into a first RZ signal using a full-frequency clock; a second signal transformer converting the other one of the two NRZ input signals into a second RZ signal using a full-frequency clock; a phase adjuster adjusting the first and second RZ signals so that a delay time corresponding to half a period of the input signal exists between the first and second RZ signals; a bias unit adding different DC (direct current) bias voltages to the first and second RZ signals; and a dual electrode optical modulator transforming the two electrical RZ signals into an optical CS-RZ signal.Type: GrantFiled: August 10, 2006Date of Patent: October 19, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Hyun Woo Cho, Dong Soo Lee, Je Soo Ko
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Patent number: 7813648Abstract: A transmitter includes a frequency modulated laser. An optical spectrum reshaper (OSR) is positioned to receive the frequency modulated signal and has a transmission function effective to convert the frequency modulation to amplitude modulation. An optical fiber channel has a first end positioned to receive the filtered signal and a second end proximate a receiver. A filter is positioned between the second end and the receiver and has a peak transmission frequency thereof located on a transmission edge of the OSR, such as at a peak logarithmic derivative value of the transmission function of the optical spectrum reshaper. In some embodiments a first OSR is positioned to receive the frequency modulated signal and configure to output a filtered signal wherein high frequency portions are more attenuated than low frequency portions. A second OSR at the receiver attenuates the low frequency portions substantially more than the high frequency portions.Type: GrantFiled: August 6, 2008Date of Patent: October 12, 2010Assignee: Finisar CorporationInventors: Daniel Mahgerefteh, Parviz Tayebati
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Patent number: 7801451Abstract: An optical phase modulation circuit includes an optical phase modulation element, an optical bandpass filter, and an optical directional coupler, wherein control light with a wavelength of ?C is coupled with probe light with a wavelength of ?P using the optical directional coupler and input to the optical phase modulation element, the probe light that has been phase modulated by the optical phase modulation element is extracted through the optical band pass filter, and the phase of the probe light is modulated in response to the intensity of the control light.Type: GrantFiled: August 22, 2007Date of Patent: September 21, 2010Assignees: National Institute of Information and Communications Technology, National Institute of Advanced Industrial Science and TechnologyInventors: Hidemi Tsuchida, Hiroshi Ishikawa, Takashi Shimoyama, Abedin Kazi Sarwar, Tetsuya Miyazaki
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Patent number: 7787779Abstract: A photonic waveform generator and system is described. The photonic waveform generator is used in produce an electrical pulse having arbitrarily controllable temporal characteristics in a Fourier transform (FT) pulse shaper or a direct space-to-time (DST) photonic generator. The electrical pulse signal may be used in a radar, a telecommunications system or other electrical apparatus where the spectral and temporal characteristics of the signal are be optimized with respect to specific system needs, such as spectral occupancy, peak-to-average power, minimum pulse duration, target-to-clutter ratio, target type discrimination, and the like.Type: GrantFiled: May 4, 2006Date of Patent: August 31, 2010Assignee: Purdue Research FoundationInventors: Andrew M. Weiner, Jason D. McKinney
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Patent number: 7783202Abstract: An all-optical modulation format converter for converting optical data signals modulated in an on-off-keying (OOK) format to a phase-shift-keying (PSK) format. The OOK-to-PSK converter can be coupled to a delay-line interferometer to provide an all-optical wavelength converter for differential PSK (DPSK). The OOK-to-PSK converter can also be used in all-optical implementations of various functions, including, for example, exclusive-OR (XOR/NXOR) and OR logic, shift registers, and pseudo-random binary sequence (PRBS) generators.Type: GrantFiled: July 6, 2009Date of Patent: August 24, 2010Assignee: Alcatel-Lucent USA Inc.Inventor: Inuk Kang
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Patent number: 7778502Abstract: An optical transmission assembly consists of an upper cladding; a lower cladding; a core formed between the upper cladding and the lower cladding; a surface light emitting device mounted to an upper surface at one end of the upper cladding, a light emitting surface of the surface light emitting device facing the core and emitting wavelength ?1 light thereto; a reflective surface formed in the core and at a position facing the light emitting surface of the surface light emitting device, and inclined in a longitudinal direction of the core; an inclined surface formed in the core and facing the reflective surface in a longitudinal direction of the core, and inclined in a thickness direction of the upper or lower cladding; a wavelength filter formed on the inclined surface and transmitting wavelength ?1 light incident in a longitudinal direction of the core while reflecting wavelength ?2 (?2??1) light incident in the opposite longitudinal direction of the core to the incident direction of the wavelength ?1 light,Type: GrantFiled: May 15, 2008Date of Patent: August 17, 2010Assignee: Hitachi Cable, Ltd.Inventor: Akihiro Hiruta
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Patent number: 7778552Abstract: An integrated optical source includes a Directly Modulated Laser (DML) and a filter which is positioned with the DML on a common substrate. The filter is configured to receive an input signal in the form of a modulated chirped optical signal. The filter is further configured to provide an output optical signal in the form of an amplitude and/or phase modulated optical signal, optimized for long-distance transmission in optical fiber.Type: GrantFiled: March 2, 2006Date of Patent: August 17, 2010Assignee: Finisar CorporationInventors: Hongyu Deng, Yuri Vandyshev
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Patent number: 7769295Abstract: A micro-optic dual beam-splitter assembly comprises at least two beam-splitter optical filters and at least one photoreceptor. Each of the beam-splitter optical filters comprises an optical substrate having at least a coated or uncoated optical tap surface and a filter surface carrying a thin-film optical filter. The thin-film optical filters are substantially normal to the optical path from an optical signal source. Each of the optical tap surfaces is operative as an optical beam splitter to tap off an optical tap signal. The one or more photoreceptors are arranged to receive both or at least one of the optical tap signals. The tap signals comprise a portion of the optical signals passed along the optical path to the optical filter chips. The filter chips are cooperatively transmissive to an optical signal output port of a selected set of wavelengths received from the optical signal source along the optical path, and are reflective of other wavelengths.Type: GrantFiled: August 27, 2007Date of Patent: August 3, 2010Assignee: Bookham Technology plcInventors: Rad Sommer, Jill Oosterom, Claude Gamache
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Publication number: 20100183318Abstract: An LD-Driver with a back termination circuit is disclosed. The back termination circuit of the invention provides a transistor as an active device, a current source to provide a bias current to the transistor, and a resistor as a passive element that couples the transmission lines carrying a differential signal thereon. Because the transistor shows a differential resistance of several tens of ohms by providing only a few milli-amperes, the output impedance of the LD-Driver may be substantially matched with the characteristic impedance of the transmission line with lesser additional power consumption.Type: ApplicationFiled: January 19, 2010Publication date: July 22, 2010Applicant: Sumitomo Electric Industries, Ltd.Inventor: Keiji TANAKA
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Patent number: 7761012Abstract: A method of generating a dark-RZ pulse in an optical communications system with a dual-arm modulator by setting a direct current bias on the modulator to a specific value such that an output optical power from the modulator achieves a maximum value when the RF signals on the first and second arms of the modulator are off and maintaining the direct current bias at the specific value and applying RF signals to the first and second arms of the modulator and delaying one of the RF signals applied to one of the first and second arms relative to the other of the RF signals such that a dark-RZ pulse is generated with a duty cycle based on the delay.Type: GrantFiled: January 10, 2007Date of Patent: July 20, 2010Assignee: NEC Laboratories America, Inc.Inventors: Jianjun Yu, Lei Xu, Philip Nan Ji, Ting Wang
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Patent number: 7756385Abstract: An antisqueezed light generator system is built with only the components for optical communications with long-term reliability. A cw-LD light is made pulses by an intensity modulator and amplified by an optical amplifier. The amplified optical pulses are made short by high-order soliton pulse compression effect at a first optical fiber and peak power is increased. A fluctuation is expanded in a phase direction through propagation in a second optical fiber. Because an initial fluctuation is amplified by the optical amplifier, the fluctuation expanded in the phase direction is increased to the extent of the amplification and sufficient antisqueezing strength can be obtained.Type: GrantFiled: May 10, 2007Date of Patent: July 13, 2010Assignee: Hitachi, Ltd.Inventor: Tatsuya Tomaru
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Patent number: 7756424Abstract: An optical code division multiple access communication system using a processor processes at least one collimated input beam which has been modulated with a data signal to produce multiple time-delayed output beams. The multiple time-delayed output beams are spatially distributed and independently phase shifted. An integration lens receives the phase modulated output beams and reintegrates the phase modulated output beams into a single encoded beam with a time series chip sequence. The integrated encoded beam is transmitted. A receiving system includes a processor to process the encoded collimated light beams received from a transmitter to produce multiple time-delayed output beams. The multiple time-delayed output beams are spatially distributed and independently phase shifted. An integration lens receives the phase-shifted output beams and reintegrates the phase-shifted output beams into a single decoded beam.Type: GrantFiled: January 22, 2002Date of Patent: July 13, 2010Assignee: Northrop Grumman Systems CorporationInventors: Terry M. Turpin, James L. Lafuse
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Patent number: 7751723Abstract: Methods and apparatus for monitoring the power level of one or more optical emitters are provided. In some embodiments, optical signals from two or more optical emitters are directed at different regions of a photo detector. The photo detector may include two or more spaced contacts that are adapted to receive different contributions of photo current from each of the optical signals. By monitoring the photo currents in the two or more spaced contacts, a measure of the optical power of each of the optical signals may be determined.Type: GrantFiled: September 24, 2007Date of Patent: July 6, 2010Assignee: Finisar CorporationInventor: James K. Guenter
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Publication number: 20100166424Abstract: A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room temperature without the need for ambient cooling or hermetic packaging. Since there is large scale integration of N optical transmission signal WDM channels on a TxPIC chip, a new DWDM system approach with novel sensing schemes and adaptive algorithms provides intelligent control of the PIC to optimize its performance and to allow optical transmitter and receiver modules in DWDM systems to operate uncooled. Moreover, the wavelength grid of the on-chip channel laser sources may thermally float within a WDM wavelength band where the individual emission wavelengths of the laser sources are not fixed to wavelength peaks along a standardized wavelength grid but rather may move about with changes in ambient temperature.Type: ApplicationFiled: November 4, 2009Publication date: July 1, 2010Inventors: Radhakrishnan L. Nagarajan, Fred A. Kish, JR., David F. Welch, Drew D. Perkins, Masaki Kato
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Patent number: 7742700Abstract: Systems and methods for encoding information in the topology of superpositions of helical modes of light, and retrieving information from each of the superposed modes individually or in parallel. These methods can be applied to beams of light that already carry information through other channels, such as amplitude modulation or wavelength dispersive multiplexing, enabling such beams to be multiplexed and subsequently demultiplexed. The systems and methods of the present invention increase the number of data channels carried by a factor of the number of superposed helical modes.Type: GrantFiled: June 3, 2009Date of Patent: June 22, 2010Assignee: New York UniversityInventor: David G. Grier
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Patent number: 7742705Abstract: A system and method for providing chirped light for an optical network. The system includes a light source configured to provide a light. The system additionally includes a driving signal source configured to provide a first driving signal. The system also includes an amplifier configured to receive the first driving signal, amplify the first driving signal, and provide a second driving signal at a predetermined amplification level, the second driving signal being the amplified first signal. Additionally, the system includes a splitter configured to receive the second driving signal and split the second driving signal into a third driving signal and a fourth driving signal. The system also includes a first attenuator configured to receive the third driving signal, attenuate the third driving signal at a first attenuation level, and provide a fifth driving signal, the fifth driving signal being the third driving signal attenuated by the first attenuator.Type: GrantFiled: February 2, 2006Date of Patent: June 22, 2010Assignee: FutureWei Technologies, Inc.Inventors: Yu Sheng Bai, Fei Zhu
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Patent number: 7738794Abstract: In an optical transmitter comprising a directly modulated laser and a wavelength filter provided on a post-stage of the directly modulated laser, the wavelength filter has a modulated light input port for inputting modulated light output from the directly modulated laser, a filter transmitted light output port for outputting light having a wavelength included in a filter transmission band among the modulated light as filter transmitted light, and a filter cutoff light output port provided separately from the modulated light input port and the filter transmitted light output port and outputting light having a wavelength included in a filter cutoff band among the modulated light as filter cutoff light, and the peak of the filter transmission band is set on a shorter-wave side from the peak of the spectrum of modulated light output from the directly modulated laser.Type: GrantFiled: March 1, 2006Date of Patent: June 15, 2010Assignee: Fujitsu LimitedInventors: Suguru Akiyama, Tsuyoshi Yamamoto