Including Specific Optical Elements Patents (Class 398/201)
  • Publication number: 20150055962
    Abstract: An optical apparatus comprising an optical source for providing output light for providing input signal light can comprise a pump source for pumping a four wave mixing (FWM) process with light pulses (“FWM pump light”); a FWM element in optical communication with said pump source, said FWM element configured for hosting the FWM process to generate, responsive to the FWM pump light, pulses of FWM signal light and FWM idler light having different wavelengths; and a laser or amplifier optical device comprising a gain material for providing optical gain at a gain wavelength via a process of stimulated emission responsive to optical pumping with pump light, said laser or amplifier optical device in optical communication with said optical source and receiving one of the FWM signal light and the FWM idler light as input signal light having the gain wavelength for optically seeding with input signal light the laser or amplifier optical device.
    Type: Application
    Filed: November 3, 2014
    Publication date: February 26, 2015
    Inventors: John Redvers Clowes, Michael Yarrow
  • Patent number: 8953947
    Abstract: In some examples, a transmit assembly is described that may include a first optical transmitter, a second optical transmitter, and a polarizing beam combiner. The first optical transmitter may be configured to emit a first optical data signal centered at a first frequency. The second optical transmitter may be configured to emit a second optical data signal centered at a second frequency offset from the first frequency by a nominal offset n. The polarizing beam combiner may be configured to generate a dual carrier optical data signal by polarization interleaving the first optical data signal with the second optical data signal. An output of the polarizing beam combiner may be configured to be communicatively coupled via an optical transmission medium to a polarization-insensitive receive assembly.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: February 10, 2015
    Assignee: Finisar Corporation
    Inventors: Ilya Lyubomirsky, Yasuhiro Matsui, Daniel Mahgerefteh
  • Patent number: 8934788
    Abstract: An optical apparatus for use in an optical communications network, and a method of operating a network are described. The apparatus includes an input suitable for receiving a first continuous wave optical signal from a remote location on a network, and a modifying unit arranged to modify the first continuous wave optical signal to produce a second continuous wave optical signal having a wavelength which is different from the wavelength of the first continuous wave optical signal. A modulating unit is arranged to modulate the second continuous wave optical signal with data to produce a modulated second continuous wave optical signal.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: January 13, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Fabio Cavaliere
  • Publication number: 20140355981
    Abstract: An optical transmission device includes a splitter configured to have at least a first port, a second port, and a third port that output branched input light, branching ratios of the first port and the second port being variable, and a controller configured to reduce an optical level of output light from the first port to be monitored and increase an optical level of output light from the second port according to the reduced optical level of output light from the first port by controlling the branching ratios.
    Type: Application
    Filed: April 29, 2014
    Publication date: December 4, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Satoshi Miyazaki
  • Publication number: 20140341593
    Abstract: A manner of mitigating the self heating effect of a laser or other light source such as a laser in a network node of a communication network. A self-heating mitigation module is provided, the self-heating mitigation module includes one or both of a self-heating adjustment module to accelerate self heating at the beginning of a transmission and a sub-threshold lasing module that applies a sub-threshold current between transmissions. The self-heating adjustment module and the sub-threshold lasing module are preferable both used together and driven by a common signal, for example the burst_enable signal that facilitates transmission from the light source.
    Type: Application
    Filed: May 16, 2014
    Publication date: November 20, 2014
    Applicants: ALCATEL-LUCENT USA INC., ALCATEL-LUCENT
    Inventors: Doutje T. van Veen, Robert Farah, Peter Vetter, Wolfgang Poehlmann
  • Patent number: 8891976
    Abstract: An interferometer is provided that includes a first path and a second path. The first path is configured to propagate an electro-magnetic signal at a first wavelength. The second path is configured to convert a portion of the electro-magnetic signal from the first wavelength to a second wavelength for processing and is configured to convert the portion of the electro-magnetic signal from the second wavelength back to the first wavelength for interference with the electro-magnetic signal of the first path. The first wavelength may be an optical wavelength or any other suitable wavelength of the electro-magnetic spectrum. The second wavelength, which is different than the first wavelength, also may be any suitable wavelength of the electro-magnetic spectrum.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: November 18, 2014
    Assignee: Alcatel Lucent
    Inventor: Peter Winzer
  • Publication number: 20140321856
    Abstract: A transmitter optical module is disclosed. The transmitter optical module has optical sources each emitting optical beam with a specific wavelength different from others and lenses corresponding to the optical sources. The optical sources and the lenses are mounted on a carrier. The carrier provides grooves surrounding rectangular areas where each of the lenses is mounted.
    Type: Application
    Filed: October 24, 2013
    Publication date: October 30, 2014
    Inventors: Tomoya Saeki, Munetaka Kurokawa, Kazunori Tanaka
  • Patent number: 8873657
    Abstract: Embodiments of the present invention disclose a data transmission method and a related device and system. A data transmission method includes: A transmitter performs scrambling, constellation modulation, and multiple-input multiple-output precoding processing sequentially on downlink user data to obtain a precoded symbol sequence; performs time-frequency resource mapping on the precoded symbol sequence to obtain frequency domain data of an OFDM symbol; performs conjugate symmetric extension and IFFT on the frequency domain data of the OFDM symbol to obtain a time domain real-number sequence; performs CP insertion processing on the time domain real-number sequence to form a first downlink time domain baseband signal; loads the first downlink time domain baseband signal onto a direct current of a LED lighting circuit to form a LED driving electrical signal; and converts the LED driving electrical signal into a visible beam of the LED for transmission.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: October 28, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Sheng Liu, Rongdao Yu, Rui Wang
  • Patent number: 8861977
    Abstract: A number of carriers are selected according to a modulation format and symbol rate to realize a superchannel having fixed capacity, for example. At a receive node, the superchannel is optically demultiplexed from a plurality of other superchannels. The plurality of carriers are then supplied to a photodetector circuit, which receives additional light at one of the optical signal carrier wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of the carriers is unnecessary.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: October 14, 2014
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Matthew L. Mitchell, David F. Welch
  • Patent number: 8861978
    Abstract: A wave division multiplexing (WDM) system is disclosed which accommodates shifts in the resonant frequency of optical modulators by using at least two carriers per optical communications channel and at least two resonant modulator circuits respectively associated with the carriers within each optical modulator. A first resonant modulator circuit resonates with a first carrier and a second resonates with a second carrier when there is a shift in resonance frequency of the at least two resonant optical modulator circuits. A switch circuit controls which carrier is being modulated by its respective resonant modulator circuit.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: October 14, 2014
    Assignee: Micron Technology, Inc.
    Inventors: Roy Meade, Gurtej Sandhu
  • Patent number: 8861960
    Abstract: The present disclosure provides systems and methods for the compensation of signal distortion in fiber optic communication systems and the like. More specifically, the present disclosure provides an orthogonal polarization detection and broadband pilot (OPDBP) technique for the compensation of nonlinear cross polarization (i.e. nonlinear cross polarization modulation) (XPolM) induced noise and nonlinear nonlinear cross phase modulation (XPM) induced noise in a high data rate polarization multiplexed (PM) multilevel-quadrature amplitude modulated (M-QAM) channel due to neighboring channels. This approach allows for the compensation of both XPolM and XPM simultaneously, providing several dBs of optical reach extension. The approach uses a pilot tone based orthogonal polarization detection scheme with broadband (i.e. a few GHz wide) filtering of the pilot tones.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: October 14, 2014
    Assignee: Ciena Corporation
    Inventors: Vladimir S. Grigoryan, Michael Y. Frankel
  • Patent number: 8842997
    Abstract: Return To Zero (RZ) shaping is performed for a first I/Q modulator whose output corresponds to a first polarization component using a first two digital-to-analog convertors (DACs), each of which is sampled at approximately twice a modulation symbol rate or more and has an output with a first interleaving order that interleaves one of a first pair of intended drive signal patterns and zeros. RZ shaping is also performed for a second I/Q modulator whose output corresponds to a second polarization component using a second two DACs, each sampled at approximately twice the modulation symbol rate or more and having a second interleaving order that interleaves zeros and one of a second pair of intended drive signal patterns, the second interleaving order opposite the first interleaving order. The first polarization and the second polarization may be combined, thereby forming an Interleaved Return To Zero (IRZ) Polarization Division Multiplexed (PDM) signal.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: September 23, 2014
    Assignee: Alcatel Lucent
    Inventors: Xiang Liu, Chandrasekhar Sethumadhavan
  • Patent number: 8843001
    Abstract: An optical transmitter is disclosed. An optical modulator outputs an optical signal by modulating light being input, and has an optical absorption characteristic which changes a degree of optical absorption depending on a bias voltage being applied and includes a first characteristic region and a second characteristic region in which the degree of the optical absorption is greater than the first characteristic region. An power source applies an electric field generated by applying a predetermined shutdown bias voltage corresponding to the second characteristic region to electrodes provided in two interference optical guides formed in the optical modulator, when an output of the optical signal from the optical modulator is shut down to be less than or equal to a desired amount.
    Type: Grant
    Filed: October 30, 2011
    Date of Patent: September 23, 2014
    Assignee: Fujitsu Optical Components Limited
    Inventor: Ryoji Nagase
  • Patent number: 8834040
    Abstract: Cable adapters and connectors receive electrical signals and output optical signals. A cable adapter can receive various data signals in multiple interface protocols at a first electrical connector and provide an optical signal at a second connector. The conversion of electrical signals to optical signals may be achieved at various locations in the cable adapter. A connector can include an optical transmitter for converting electrical signals into optical signals. Such a connector can be provided on an output end of a cable adapter to provide optical signals corresponding to electrical signals received at an input connector of the cable adapter.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: September 16, 2014
    Assignee: Apple Inc.
    Inventors: Mathias Schmidt, Stan Rabu
  • Patent number: 8837954
    Abstract: A system includes a beacon device including a communication strip having a plurality of directed light emitters distributed along the communication strip. The beacon device can transmit a directed light signal via the directed light emitters. The system further includes a tag including a processor, a radio frequency transmitter coupled to the processor, a directed light receiver coupled to the processor, and a lens having first and second major surfaces and a side surface, the tag to receive the directed light signal via the side surface and to transmit a radio frequency tag message via the radio frequency transmitter. The system also includes a radio frequency reader to receive the radio frequency tag message.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: September 16, 2014
    Assignee: RF Code, Inc.
    Inventors: Michael R. Primm, Ronald B. Graczyk, Ryan D. Joy, Matthew C. Blackledge
  • Patent number: 8824900
    Abstract: A method for generating an optical single sideband signal comprising the steps of splitting an optical field into two parts and introducing a relative phase delay of +/??/4 radians in each direction of transmission to one of the parts, intensity reflection-modulating each part with electrical signals having a relative phase delay of +/??/2 radians and then recombining the reflection-modulated signals.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: September 2, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Peter Healey, David William Smith, Graeme Douglas Maxwell
  • Patent number: 8818208
    Abstract: A laser mux assembly generally includes a back reflector selectively coupled to one of the input ports of an optical multiplexer, such as an arrayed waveguide grating (AWG), and at least one laser emitter coupled to an output port. The laser emitter may include a gain region that emits light across a plurality of wavelengths including, for example, channel wavelengths in an optical communication system. The emitted light is coupled into the output port and the AWG or optical multiplexer filters the emitted light from the laser emitter at different channel wavelengths. The back reflector reflects the filtered light at the respective channel wavelength such that lasing occurs at the channel wavelength(s) of the reflected, filtered light. The laser mux assembly may be used, for example, in a tunable transmitter, to generate an optical signal at a selected channel wavelength.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: August 26, 2014
    Assignee: Applied Optoelectronics, Inc.
    Inventors: Jun Zheng, Stefan J. Murry
  • Patent number: 8805205
    Abstract: Data security of a multi-dimensional code system is increased. An optical device is provided with a single input port; a splitter splitting an input light from the input port into a plurality of lights; a plurality of phase shifters each shifting one of the lights split by the splitter; a multi-port encoder/decoder inputting the lights whose phases are shifted by the phase shifters and generating spectral encoded codes; and a plurality of output ports outputting the spectral encoded codes generated by the multi-port encoder/decoder.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: August 12, 2014
    Assignee: National Institute Of Information And Communications Technology
    Inventors: Naoya Wada, Gabriella Cincotti, Xu Wang, Kenichi Kitayama
  • Patent number: 8798474
    Abstract: A method and apparatus for communicating information content by modulation of light in an illumination system via a liquid lens optically coupled to the illumination system and capable of modulation of light thereof, using resonant modes of the liquid lens. A modulation control system operatively coupled to the liquid lens and to the information content is configured to represent at least a portion of the information content as a time-varying configuration of the liquid lens, the time-varying configuration substantially including one or more of said one or more resonance modes. A receiver system optically coupled to the liquid lens is configured to reconstruct at least a portion of the information content from light modulated by the time-varying configuration of the liquid lens.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: August 5, 2014
    Assignee: Koninklijke Philips N.V.
    Inventor: Ian Ashdown
  • Patent number: 8792792
    Abstract: [PROBLEM] Providing an optical source that outputs optical frequency modulated light having a constant output optical intensity. [MEANS FOR SOLVING THE PROBLEM] Provided is a light source apparatus that outputs an optical signal having an optical frequency corresponding to a frequency control signal, the light source apparatus including a laser light source section that outputs laser light having an optical frequency corresponding to the frequency control signal; and an optical intensity adjusting section that compensates for intensity change of the laser light to output laser light in which the intensity change caused by a change in the optical frequency is restricted.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: July 29, 2014
    Assignee: Advantest Corporation
    Inventors: Shin Masuda, Kazunori Shiota
  • Patent number: 8787772
    Abstract: A laser package may include a semiconductor laser and a memory device integrated into the laser package for storing parameters associated with the laser. The parameters may include laser manufacturing, operational and/or user parameters. For example, the semiconductor laser may be tunable and the memory device may store tuning parameter data. One example of the laser package is a tunable transmitter optical sub-assembly (TOSA) package.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: July 22, 2014
    Assignee: Applied Optoelectronics, Inc.
    Inventor: Chan Chih Chen
  • Patent number: 8774568
    Abstract: Provided is an optical module. The optical module includes: an optical bench having a first trench of a first depth and a second trench of a second depth that is less than the first depth; a lens in the first trench of the optical bench; at least one semiconductor chip in the second trench of the optical bench; and a flexible printed circuit board covering an upper surface of the optical bench except for the first and second trenches, wherein the optical bench is a metal optical bench or a silicon optical bench.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: July 8, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young-Tak Han, Jang Uk Shin, Sang-Pil Han, Sang Ho Park, Yongsoon Baek
  • Patent number: 8750721
    Abstract: A light source control section 15 selects a first light emitting device arrangement (color combination device group) in which LEDs 19 make a particular visible light color by color synthesis and form one optical communication channel, and then causes the first light emitting device arrangement to emit light, and selects a second light emitting device arrangement so that a light quantity of a light source 18 as a whole becomes uniform, and then causes the selected second light emitting device arrangement to emit light when the first light emitting device arrangement does not emit light. As a result, upon performing optical communication, an optical transmitting apparatus and an optical communication system that can emit an illumination light at a uniform light quantity without generating a flicker of illumination can be realized.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: June 10, 2014
    Assignee: Kyocera Corporation
    Inventor: Yasuyuki Irie
  • Patent number: 8737846
    Abstract: An optical source uses feedback to maintain a substantially fixed spacing between adjacent wavelengths in a set of wavelengths in a wavelength comb output by the optical source. In particular, a set of light sources in the optical source provide optical signals having the set of wavelengths. Moreover, the optical signals are output at diffraction angles of an optical device in the optical source (such as an echelle grating), and optical detectors in the optical source determine optical metrics associated with the optical signals. Furthermore, control logic in the optical source provides control signals to the set of light sources based on the determined optical metrics.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: May 27, 2014
    Assignee: Oracle International Corporation
    Inventors: Xuezhe Zheng, Ying Luo, Guoliang Li, Ashok V. Krishnamoorthy
  • Patent number: 8725004
    Abstract: Methods and apparatus for optical analog to digital conversion are disclosed. An optical signal is converted by mapping the optical analog signal onto a wavelength modulated optical beam, passing the mapped beam through interferometers to generate analog bit representation signals, and converting the analog bit representation signals into an optical digital signal. A photodiode receives an optical analog signal, a wavelength modulated laser coupled to the photodiode maps the optical analog signal to a wavelength modulated optical beam, interferometers produce an analog bit representation signal from the mapped wavelength modulated optical beam, and sample and threshold circuits corresponding to the interferometers produce a digital bit signal from the analog bit representation signal.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: May 13, 2014
    Assignee: Sandia Corporation
    Inventor: Gregory A. Vawter
  • Patent number: 8718486
    Abstract: In various embodiments, a monolithic integrated transmitter, comprising an on-chip laser source and a modulator structure capable of generating advanced modulation format signals based on amplitude and phase modulation are described.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: May 6, 2014
    Assignee: Freedom Photonics, LLC.
    Inventors: Jonathon Barton, Leif Johansson, Milan Mashanovitch
  • Patent number: 8712252
    Abstract: To efficiently apply jitter to an optical signal using a simple configuration, provided is an optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal; an optical modulation section that modulates the optical signal output by the light source section, according to a designated pulse pattern; and an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: April 29, 2014
    Assignee: Advantest Corporation
    Inventors: Shin Masuda, Kazunori Shiota
  • Publication number: 20140112668
    Abstract: A stamped metal optic is provided that is a unitary, or integrally formed, part that includes at least a bench for holding at least one optoelectronic component and a reflector for folding an optical pathway. The stamped metal optic is formed of a piece of metal that is shaped using known metal stamping techniques. The stamped metal optic preferably has at least one fiducial mark formed therein that is used for placement of the optoelectronic device on the bench to ensure that the optoelectronic device is precisely aligned with the reflector. Because metal objects can be formed relatively inexpensively with high precision using known stamping techniques, the stamped metal optics can be manufactured with high precision at relatively low cost.
    Type: Application
    Filed: October 23, 2012
    Publication date: April 24, 2014
    Applicant: Avago Technologies General IP (Singapore) Pte. Ltd .
    Inventor: Laurence R. McColloch
  • Patent number: 8693894
    Abstract: A gain clamped optical device includes a semiconductor stack and a resonant cavity configured to emit stimulated light. A window created in the optical device is configured to emit the stimulated light in an LED mode.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: April 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Shih-Yuan Wang, Michael Tan, Alexandre Bratkovski, Sagi Mathai
  • Patent number: 8693878
    Abstract: The invention relates to an illumination device connectable to an AC voltage source for applying an alternating voltage during a series of time intervals. The illumination device comprises at least a first light source and a second light source, arranged to be connected in series to the AC voltage source, to generate a luminance output in response to the alternating voltage. Selection means are provided configured for selectively applying the alternating voltage over the first light source or the first and second light source. A controller is provided for controlling the selection means in response to a data signal comprising data symbols such that one or more of the data symbols are contained in said luminance output. The invention also relates to a method of embedding one or more data symbols in the luminance output of such an illumination device, an optical receiver and an illumination system.
    Type: Grant
    Filed: November 27, 2009
    Date of Patent: April 8, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Tim C. W. Schenk, Lorenzo Feri, Peter Deixler
  • Patent number: 8666260
    Abstract: A burst mode laser transmitter includes a burst mode laser diode and a controller having an input for receiving an RF data signal. The controller includes a triggering arrangement and a modulation arrangement. The triggering arrangement is configured to bias the laser diode to an on-state bias level when an RF data signal is present at the input to the controller and to an off-state bias level when no RF data signal is present at the input to the controller. The modulation arrangement is configured to modulate the on-state bias level at which the laser diode is biased with the RF data signal only when the RF data signal is present at the input of the controller.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: March 4, 2014
    Assignee: General Instrument Corporation
    Inventors: Ihab E. Khalouf, Kerry I. Litvin
  • Patent number: 8666261
    Abstract: A photoelectric encoder includes a scale; a detector; alight application section; a pair of origin signal reception sections; and a signal processing section adapted to provide the maximum value of the signal level output from the origin signal reception sections by side lobe light occurring as reflected on the origin mark as a stipulated value, provide an effective area of origin detection between the first position at which output of one of the origin signal reception sections for outputting a larger signal level than the stipulated value earlier than the relative displacement becomes a larger signal level than the stipulated value and the first position at which output of the other origin signal reception section exceeds the stipulated value and then becomes a smaller signal level than the stipulated value, and configured to generate the origin detection signal in the effective area.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: March 4, 2014
    Assignee: Mitutoyo Corporation
    Inventor: Tomotaka Takahashi
  • Patent number: 8655176
    Abstract: A system and methods are provided for converting a first temporally short and spectrally broad optical pulse into a train of spectrally narrow and distinct optical pulses. This involves receiving, on a first I/O channel, the first optical pulse associated with a plurality of wavelengths and performing wavelength division demultiplexing on the first optical pulse at an optical unit housed on an optical chip to output a plurality of second optical pulses on different ones of a plurality of second I/O channels, each of the second optical pulses associated with a unique wavelength range from the first optical pulse. This also involves receiving the second optical pulses at loop mirrors in the second I/O channels, wherein the second I/O channels are patterned as waveguides in the optical chip and reflecting, at the loop mirrors, the second optical pulses back to the optical unit.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: February 18, 2014
    Assignee: Telcordia Technologies, Inc.
    Inventor: Janet Jackel
  • Patent number: 8655189
    Abstract: An optical modulation system includes a metamaterial structure configured to receive and process an input optical signal at at least one operational wavelength, where the metamaterial structure changes between a transmissive state and a non-transmissive state with respect to the optical signal(s) at the operational wavelength(s) in response to an external stimulus applied to the metamaterial structure. An external stimulus source is coupled with the metamaterial structure and is configured to change the metamaterial structure between its transmissive and non-transmissive states by applying selected stimulus pulses to the metamaterial structure. The optical modulation system processes the input optical signal to output a modulated optical signal that modulates in correspondence with the selected pulses applied to the metamaterial structure.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: February 18, 2014
    Assignee: Exelis, Inc.
    Inventors: Robert Joseph Almassy, Anthony Bresenhan Kaye, Thomas Matthew Fletcher
  • Publication number: 20140044436
    Abstract: An optical transmitter and an optical transceiver including the same are provided. The optical transmitter may include a semiconductor laser diode to output optical signals, a multilayer thin film filter to receive the optical signals and pass optical signals corresponding to a transmission wavelength band, and a concave lens to collect the optical signals passed through the multilayer thin film filter.
    Type: Application
    Filed: August 8, 2013
    Publication date: February 13, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Jie Hyun LEE, Seung Hyun CHO, Kyeong Hwan DOO, Seung Il MYONG
  • Publication number: 20140044438
    Abstract: A surface emitting semiconductor laser includes a first semiconductor multilayer reflector of a first conductivity type, an active area, a second semiconductor multilayer reflector of a second conductivity type, a current confinement layer having a conductive area and a surrounding high-resistance area, each provided on a substrate, and a higher-order transverse mode suppressing layer formed on an emission surface from which laser light is emitted and in an area in which higher-order transverse mode is induced. The higher-order transverse mode suppressing layer includes first to third insulation films having first to third refractive indices, respectively, formed on each other, and capable of transmitting an oscillation wavelength. The second refractive index is lower than the first refractive index. The third refractive index is higher than the second refractive index. The optical film thickness of the first to third insulation films is an odd number times one-fourth of the oscillation wavelength.
    Type: Application
    Filed: June 5, 2013
    Publication date: February 13, 2014
    Inventors: Kazutaka Takeda, Takashi Kondo
  • Patent number: 8644714
    Abstract: Provided is a multi-wavelength optical source generator. The multi-wavelength optical source generator includes: a gain part generating a plurality of lights through a plurality of gain waveguides; a reflective part transmitting or reflecting lights provided from each of the plurality of gain waveguides according to a wavelength; and a multiplexing part multiplexing a plurality of lights transmitted and outputted through the reflective part.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: February 4, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Oh-Kee Kwon, Chul-Wook Lee, Dong-Hun Lee, Young Ahn Leem, Yongsoon Baek
  • Publication number: 20140029953
    Abstract: The invention relates to an optical coupling unit for an arrangement for sending optical signals, including a base unit, a light path formed between a light input and a light output of the base unit and configured to transmit light received via the light input to the light output, an outer light path section included in the light path, which section extends outside the base unit and into which the light transmitted along the light path emerges from the base unit via a light exit and from which the light after passing through the outer light path section enters again into the base unit via a light entry, and a light decoupling element, which is formed in the light path by means of at least one beamsplitting surface coating and configured to decouple a portion of the light transmitted along the light path. Furthermore the invention relates to an arrangement for sending optical signals and to an optical transceiver.
    Type: Application
    Filed: December 20, 2011
    Publication date: January 30, 2014
    Applicant: Le Jupiter, 8, Parc Ariane
    Inventors: Sven Otte, Kai Schamuhn, Andreas Krink, Juergen Blank, Nicola Iwanowski
  • Patent number: 8638489
    Abstract: Techniques and configurations are provided to generate multiple coherent optical subcarriers. A laser source generates as output a light beam at a carrier frequency. A multicarrier generator is provided that is coupled to the laser source and comprises one or more dual carrier generators each configured to modulate the light beam at the same modulation frequency or different modulation frequencies so as to output a plurality of light beams each at a different subcarrier frequency that is offset from the carrier frequency. The multicarrier generator generates the plurality of light beams on individual outputs, e.g., fibers, without the need for an optical demultiplexing filter.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: January 28, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Thomas Duthel, James Whiteaway
  • Patent number: 8620164
    Abstract: Described herein is a hybrid III-V Silicon laser comprising a first semiconductor region including layers of semiconductor materials from group III, group IV, or group V semiconductor to form an active region; and a second semiconductor region having a silicon waveguide and bonded to the first semiconductor region via direct bonding at room temperature of a layer of the first semiconductor region to a layer of the second semiconductor region.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: December 31, 2013
    Assignee: Intel Corporation
    Inventors: John Heck, Hanan Bar, Richard Jones, Hyundai Park
  • Publication number: 20130336664
    Abstract: Methods and systems for a photonically enabled complementary metal-oxide semiconductor (CMOS) chip are disclosed. The CMOS chip may comprise a laser, a microlens, a turning mirror, and an optical bench, and may generate an optical signal utilizing the laser, focus the optical signal utilizing the microlens, and reflect the optical signal at an angle defined by the turning mirror. The reflected optical signal may be transmitted into the photonically enabled CMOS chip, which may comprise a non-reciprocal polarization rotator, comprising a latching faraday rotator. The CMOS chip may comprise a reciprocal polarization rotator, which may comprise a half-wave plate comprising birefringent materials operably coupled to the optical bench. The turning mirror may be integrated in the optical bench and may reflect the optical signal to transmit through a lid operably coupled to the optical bench.
    Type: Application
    Filed: May 14, 2013
    Publication date: December 19, 2013
    Inventors: Michael Mack, Mark Peterson, Steffen Gloeckner, Adithyaram Narasimha, Roger Koumans, Peter De Dobbelaere
  • Patent number: 8611751
    Abstract: Systems, apparatus and method for modulating digital data onto an optical carrier to produce a modulated optical carrier in which symbol-modulated optical signals of orthogonal polarizations are temporally interleaved and adapted to be processed by electronic time-division demultiplexing to recover the digital data modulated onto the orthogonal polarizations of the optical signals.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: December 17, 2013
    Assignee: Alcatel Lucent
    Inventors: Xiang Liu, Chandrasekhar Sethumadhavan
  • Patent number: 8582983
    Abstract: A method and system for generating multi-subcarriers is disclosed. Re-circulating frequency shifters—based on the frequency shifting in two cascading phase modulators—are used to generate 112 subcarriers with stable architecture since there is no direct current bias in phase modulators.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: November 12, 2013
    Assignees: ZTE Corporation, ZTE (USA) Inc.
    Inventor: Jianjun Yu
  • Patent number: 8571421
    Abstract: An apparatus is disclosed for the optical generation of clock signals with tunable frequency and low jitter. A laser source serves as both the carrier used to transmit the clock signal for use by other optical, electronic or hybrid circuit elements and the original modulation time base. A fraction of the original laser source undergoes one or more stages of frequency division before being recombined as a modulation signal with the remaining laser beam. Transmission of the resulting signal via single mode fiber and dividers retains the low jitter properties of the modulated signal. By starting with a clock signal of optical frequency then dividing downward in frequency, comparatively high frequency clocks may be generated, notably in the GigaHertz and TeraHertz frequency ranges.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: October 29, 2013
    Assignee: FTL Systems, Inc.
    Inventors: John C. Willis, Ruth A. Betcher
  • Patent number: 8565616
    Abstract: A polarized-wave-multiplexing optical transmitter including: an optical combiner generating a polarized-wave-multiplexed optical signal by polarized-wave-multiplexing a first optical modulation signal and a second optical modulation signal; an optical power fluctuation portion fluctuating optical power of the first optical modulation signal and the second optical modulation signal periodically; a total-optical-power detection portion detecting fluctuation amount of total optical power of the polarized-wave-multiplexed optical signal; and an optical power controller reducing an optical power difference between the first optical modulation signal and the second optical modulation signal based on detection result of the total-optical-power detection portion.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: October 22, 2013
    Assignee: Fujitsu Limited
    Inventors: Toshiki Tanaka, Yuichi Akiyama, Masato Nishihara
  • Patent number: 8565619
    Abstract: An apparatus for preventing collision of upstream signals is provided. The apparatus is suitable for a time division multiplexing (TDM) passive optical network (PON). The apparatus includes an optical coupler device, an optic-electron converter (O/E), a control system, and an optical signal switch module. The O/E is coupled to the optical coupler device, the control system is coupled to the O/E, and the optical signal switch module is coupled to the optical coupler device and the control system. The optical coupler device receives a first optical signal and splits the first optical signal into a second optical signal and a third optical signal. The O/E converts the second optical signal into a first electrical signal. The control system generates a control signal according to the first electrical signal. The optical signal switch module determines whether to stop the third optical signal from passing the apparatus according to the control signal.
    Type: Grant
    Filed: December 25, 2007
    Date of Patent: October 22, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Chien-Hung Yeh, Sien Chi
  • Patent number: 8565614
    Abstract: A digital data transmission device is provided comprising optical waveguide architecture, a sideband generator, a modulation controller, an optical filter, a data mapping unit, and a phase controller. The optical waveguide architecture is configured to direct an optical signal through the sideband generator and the optical filter. The sideband generator comprises an electrooptic interferometer comprising first and second waveguide arms. The modulation controller is configured to generate an electrical drive signal to drive the sideband generator at a control voltage that is substantially larger than V? to generate optical frequency sidebands about a carrier frequency of the optical signal. The optical filter is configured to discriminate between the optical frequency sidebands and the optical carrier frequency such that optical sidebands of interest can be directed through the optical waveguide architecture as an optical millimeter wave signal.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: October 22, 2013
    Assignee: Battelle Memorial Institute
    Inventor: Richard W. Ridgway
  • Patent number: 8559820
    Abstract: A complex orthogonal code in the present invention is one in which each row of a square matrix of N rows and N columns in which an element of an mth row and nth column is exp[2?j(m?1)(n?1)/N] (where j is an imaginary unit) is adopted as a code word. An optical orthogonal code for Optical Code Division Multiplexing/Optical Code Division Multiple Access (OCDM/OCDMA) is realized by a train of N-number of optical pulses corresponding to the argument (phase) of the code elements. An optical transmitter or optical receiver includes an optical correlator provided with a sampled Bragg grating having a plurality of Bragg gratings disposed serially at regular intervals inside an optical waveguide. The optical correlator is allocated any one of the code words. In the optical transmitter, an optical signal to be transmitted is encoded by the optical correlator. In the receiver, a received optical signal is decoded by the optical correlator.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: October 15, 2013
    Assignee: University of Yamanashi
    Inventor: Masanori Hanawa
  • Patent number: 8554088
    Abstract: An optical transmission apparatus in an optical transmission system that transmits an optical signal through a transmission fiber includes a measurement device that measures Raman gain efficiency of the transmission fiber; a level determiner that determines an input level of the optical signal based on Raman gain efficiency measured by the measurement device; and a controller that controls a level of the optical signal input to the transmission fiber to become the input level determined by the level determiner.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: October 8, 2013
    Assignee: Fujitsu Limited
    Inventor: Ryosuke Goto
  • Patent number: 8554083
    Abstract: A method for producing an electromagnetic carrier wave in the frequency range between 0.1 and 10 terahertz that is suitable for the wireless transmission of data includes generating, by an electromagnetic pump wave, at least two mixing waves with a defined frequency difference, the pump wave being configured to constitute one of the mixing waves; and producing an electromagnetic carrier wave by frequency mixing the mixing waves.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: October 8, 2013
    Assignee: Deutsche Telekom AG
    Inventors: Ingo Breunig, Karsten Buse, Jens Kiessling, Bastian Knabe, Rosita Sowade