Phase Modulation Type Patents (Class 385/3)
  • Patent number: 10416525
    Abstract: Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: September 17, 2019
    Assignee: NeoPhotonics Corporation
    Inventor: Jianying Zhou
  • Patent number: 10359653
    Abstract: A thin-plate LN optical control device includes: a thin-plate LN optical waveguide element which includes an optical waveguide formed by thermal diffusion of Ti in a substrate made of lithium niobate, and a control electrode that is formed on the substrate and is configured to control a light wave propagating through the optical waveguide, and in which at least a part of the substrate is thinned; and a housing that accommodates the thin-plate LN optical waveguide element in an air-tight sealing manner. Oxygen is contained in a filler gas inside the housing.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: July 23, 2019
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Katsutoshi Kondou, Kiyotaka Nakano, Eiji Murakami
  • Patent number: 10353225
    Abstract: The purpose of the present invention is to allow a silicon photonics modulator to be operated at high speed with high frequency by providing an electrode structure for the small multichannel high-density silicon photonics modulator. This electrode structure for a silicon photonics modulator includes, on the planar surface of a silicon substrate, a first layer for forming a plurality of bias electrical wirings, and a second layer formed by aligning each of a plurality of ground electrode portions and each electrical wiring in the first layer.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: July 16, 2019
    Assignee: PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATION
    Inventors: Kenichiro Yashiki, Yasuyuki Suzuki
  • Patent number: 10330875
    Abstract: An optical module includes a laser light supply system and a chip disposed within a housing. The chip includes a laser input optical port and a transmit data optical port and a receive data optical port. The optical module includes a link-fiber interface exposed at an exterior surface of the housing. The link-fiber interface includes a transmit data connector and a receive data connector. The optical module includes a polarization-maintaining optical fiber connected between a laser output optical port of the laser light supply system and the laser input optical port of the chip. The optical module includes a first non-polarization-maintaining optical fiber connected between the transmit data optical port of the chip and the transmit data connector of the link-fiber interface. The optical module includes a second non-polarization-maintaining optical fiber connected between the receive data optical port of the chip and the receive data connector of the link-fiber interface.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: June 25, 2019
    Assignee: Ayar Labs, Inc.
    Inventors: John Fini, Roy Edward Meade, Mark Wade, Chen Sun, Vladimir Stojanovic, Alexandra Wright
  • Patent number: 10331006
    Abstract: A pluggable electric connector can communicate a communication data signal and a control signal with an optical communication apparatus. An optical signal output unit includes a Mach-Zehnder type optical modulator including a phase modulation area and outputs an optical modulation signal modulated according to the communication data signal. An optical power control unit can control optical power of the optical modulation signal. A pluggable optical receptor can output the optical modulation signal to an optical fiber. A control unit controls a modulation operation of the optical signal output unit and the bias voltage applied to the phase modulation area. The control unit determines the bias voltage applied to the phase modulation area according to phase angle information of the control signal. The optical signal output unit applies the bias voltage determined by the control unit to the phase modulation area.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: June 25, 2019
    Assignee: NEC Corporation
    Inventor: Katsuhiro Yutani
  • Patent number: 10274757
    Abstract: An electro-optic device includes a first semiconductor layer including the rib-type waveguide, which includes a rib part and a first slab part, which extends in a first direction from the rib part; a dielectric layer, which is formed on the rib part; a second semiconductor layer, which extends in a second direction, which is opposite to the first direction, from an upper surface of the dielectric layer; a first high-concentration impurity region, which is formed in the first semiconductor layer to be in contact with the first slab part on the first direction side; and a second high-concentration impurity region, which is formed in a region of the second semiconductor layer on the second direction side. The second high-concentration impurity region is formed in a region other than a region overlapping the first semiconductor layer in a lamination direction.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: April 30, 2019
    Assignees: NEC CORPORATION, PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATION
    Inventors: Junichi Fujikata, Shigeki Takahashi
  • Patent number: 10248000
    Abstract: A semiconductor optical element is disclosed. The semiconductor optical element includes: a mesa-shaped optical waveguide formed on a substrate; a modulation electrode formed on the optical waveguide; a first resin layer that buries side surfaces of the optical waveguide; a bonding pad formed on the first resin layer; and a connecting wiring line that connects the modulation electrode and the bonding pad. In the semiconductor optical element, side surfaces of the bonding pad are partially covered with a second resin layer provided on the first resin layer, and the connecting wiring line extends on the second resin layer.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: April 2, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takamitsu Kitamura, Masataka Watanabe
  • Patent number: 10225004
    Abstract: Methods and systems for a connectionless integrated optical receiver and transmitter test are disclosed and may include an optoelectronic transceiver comprising a transmit (Tx) path and a receive (Rx) path, with each path comprising optical switches. The transceiver may be operable to: generate a first modulated optical signal utilizing a modulator in the Tx path, couple the first modulated optical signal to a first optical switch in the Rx path via a second optical switch in the Tx path when the optoelectronic transceiver is configured in a self-test mode, receive a second modulated optical signal via a grating coupler in the Rx path when the optoelectronics transceiver is configured in an operational mode, and communicate the second modulated optical signal to a photodetector in the Rx path via the first optical switch. The first modulated optical signal may be communicated to a grating coupler in the Tx path via the second optical switch.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: March 5, 2019
    Assignee: Luxtera, Inc.
    Inventor: Subal Sahni
  • Patent number: 10218446
    Abstract: A method and apparatus for characterizing and compensating optical impairments in an optical transmitter includes operating an optical transmitter comprising a first and second parent MZ, each comprising a plurality of child MZ modulators that are biased at respective initial operating points. An electro-optic RF transfer function is generated for each of the plurality of child MZ modulators. Curve fitting parameters are determined for each of the plurality of electro-optic RF transfer functions and operating points of each child MZ modulator are determined using the curve fitting parameters. An IQ power imbalance is determined using the curve fitting parameters. Initial RF drive power levels are determined that compensate for the determined IQ power imbalance. The XY power imbalance is determined for initial RF drive power levels using the curve fitting parameters.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: February 26, 2019
    Assignee: Finisar Corporation
    Inventors: Suhas P. Bhandare, Heider N. Ereifej, Ihab E. Khalouf, Mark Colyar
  • Patent number: 10197821
    Abstract: An optical modulator circuit includes first and second electrodes, first and second p-n junction segments (PNJSs), and first and second optical waveguides. The first PNJS includes a first modulating p-n junction (MPNJ) in series with a first non-modulating device (NMD) that are connected to the first and second electrodes, respectively, where the first NMD includes a first substantially larger capacitance than the first MPNJ. The second PNJS includes a second NMD in series with a second MPNJ that are connected to the first and second electrodes, respectively, where the second NMD includes a second substantially larger capacitance than the second MPNJ. The first and second optical waveguides superimpose the first and second MPNJs, respectively, where the first and second MPNJs are configured to modulate a refractive index of the first and second optical waveguides, respectively, based on the substantially larger capacitance of the first NMD and the second NMD.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: February 5, 2019
    Assignee: Ciena Corporation
    Inventors: Michel Poulin, Yves Painchaud, Alexandre Delisle-Simard
  • Patent number: 10191350
    Abstract: A Mach-Zehnder waveguide modulator comprising a left arm including a left SiGe optical waveguide, and a right arm including a right SiGe optical waveguide; wherein each of the left and right optical waveguides comprises a junction region and a plurality of electrodes for providing a bias across the junction to enable control of the phase of light travelling through the junction regions via dispersion.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: January 29, 2019
    Assignee: Rockley Photonics Limited
    Inventors: Guomin Yu, Aaron John Zilkie
  • Patent number: 10142028
    Abstract: A method includes monitoring a parameter of an optical signal transmitted between two endpoints via an optical fiber. The optical fiber may be manipulated to modulate the parameter without disconnecting either endpoint of the optical fiber. Data in accordance with the modulation of the monitored parameter may be identified. A portion of the optical fiber may be wrapped around a high order mode filter (HOMF) that includes a grooved cylinder or mandrel suitable for wrapping the optical fiber. The monitored parameter may include a received power parameter. The HOMF may be a variable diameter HOMF that can be transitioned between a wrapped or attenuating diameter and an unwrapped or non-attenuating diameter in accordance with a data pattern. The wrapped and unwrapped diameters may be defined relative to a threshold diameter, above which the monitored parameter may be independent of the diameter.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: November 27, 2018
    Assignee: Dell Products L.P.
    Inventors: Vinay Sawal, Marimuthu Sakthivel, Shubhang Chaudhary
  • Patent number: 10101530
    Abstract: An intersecting splitter configured so that the branching ratio of each optical splitter differs in accordance with the difference in the number of intersections in each branched waveguide. The branching ratios (totaling 100%) of the optical splitters are adjusted so that the branching ratios on the high side as to the number of intersections is high in comparison with the branching ratios on the low side as to the number of intersections, and it is thereby possible to level the total loss.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: October 16, 2018
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventor: Junichi Hasegawa
  • Patent number: 10088699
    Abstract: Modulation electrodes, bias electrodes, and bias electrodes are disposed in this order in a light wave-travelling direction in an optical modulation region modulating light having a wavelength. On the other hand, in an optical modulation region modulating light having a wavelength, the bias electrodes, the bias electrodes, and the modulation electrodes are disposed in this order in the light wave-travelling direction. That is, an order of the modulation electrodes and the bias electrodes in a longitudinal direction of a substrate is changed for each of the wavelengths.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: October 2, 2018
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Norikazu Miyazaki, Yoichi Hosokawa
  • Patent number: 10061179
    Abstract: An optical modulator includes an optical modulation element including a plurality of signal electrodes and the like, a plurality of lead pins and the like for inputting radio frequency signals, and a relay substrate in which conductor patterns and the like that electrically connect the lead pins with the signal electrodes respectively are formed, the relay substrate is disposed so that a propagation direction of the radio frequency signals that have propagated through the lead pins is bent and guided to the conductor patterns, and the relay substrate is constituted so that widths of gaps between the plurality of conductor patterns in the optical modulator-side edge of the relay substrate is smaller than, preferably smaller than 50% of widths of gaps between the plurality of conductor patterns in the lead pin-side edge.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: August 28, 2018
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Norikazu Miyazaki, Toru Sugamata
  • Patent number: 9977310
    Abstract: A digital-electronic-to-analog-optical converter, which has a structure consistent with a super-Mach-Zehnder interferometer, and which can perform the functionalities of both a Digital to Analog Converter (DAC) and a digital modulator uses a sub-Mach-Zender modulator to modulate optical wave signals propagating through its optical waveguide in a push-pull manner. The modulation performed is phase modulation realized with electrodes positioned near the optical wave guide where such electrodes carry modulation signals in digital, analog or discrete time signal format creating electromagnetic or electric fields that engage the optical wave signals traveling through the waveguide thus imparting a phase shift onto the optical wave signals. The amount of the phase shift can be implemented through the geometry of the electrodes, the length of time the modulating signal is applied, and the amplitude of the modulating signal.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: May 22, 2018
    Assignee: Alcatel Lucent
    Inventors: Peter J. Winzer, Chandrasekhar Sethumadavan, Gregory Raybon
  • Patent number: 9977270
    Abstract: An optical device is provided, which includes: an optical waveguide provided in a substrate having an electro-optic effect; a signal electrode provided on the substrate and above the optical waveguide; and a peeling prevention film which is provided on at least a part of an outer peripheral portion of the substrate and at a position spaced apart from the signal electrode, and also serves as a ground electrode.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: May 22, 2018
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Yoshizumi Ishikawa, Youichi Hosokawa, Masayuki Motoya, Satoshi Oikawa
  • Patent number: 9954134
    Abstract: An optical biosensor, and a method of manufacturing the same, includes a first layer, a second layer stacked on the first layer, a first grating coupler within the first layer and the second layer, and a second grating coupler within the first layer. The first grating coupler is configured to couple a light pattern provided to a front side of the optical biosensor. The second grating coupler is configured to output the light pattern coupled by the first grating coupler to a photoelectric conversion element on a rear side of the optical biosensor.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: April 24, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyoung Won Na, Yoon Dong Park, Sung Dong Suh, Dong Mo Im
  • Patent number: 9939663
    Abstract: A dual-ring-modulated laser includes a gain medium having a reflective end coupled to a gain-medium reflector and an output end coupled to a reflector circuit to form a lasing cavity. This reflector circuit comprises: a first ring modulator; a second ring modulator; and a shared waveguide that optically couples the first and second ring modulators. The first and second ring modulators have resonance peaks, which are tuned to have an alignment separation from each other. During operation, the first and second ring modulators are driven in opposing directions based on the same electrical input signal, so the resonance peaks of the first and second ring modulators shift wavelengths in the opposing directions during modulation. The modulation shift for each of the resonance peaks equals the alignment separation, so the resonance peaks interchange positions during modulation to cancel out reflectivity changes in the lasing cavity caused by the modulation.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 10, 2018
    Assignee: Oracle International Corporation
    Inventors: Ying Luo, Shiyun Lin, Ashok V. Krishnamoorthy, Jock T. Bovington, Xuezhe Zheng
  • Patent number: 9900021
    Abstract: An apparatus comprised of a cascaded series of optical modulators addressed by a multi-bit digital word with each optical modulator in the cascaded series being responsive to a single bit in the multi-bit digital word and wherein each of the optical modulators in the cascaded series of optical modulators doubling in effective optical length as a bit index of the bit of the multi-bit digital word to which it is responsive increases by a bit index value equal to one. The apparatus may be used with a prior art analog optical modulator and an associated ADC, having a fixed bit width, to extend the number of bits beyond the fixed bit width that the ADC and analog optical modulator prior art combination can otherwise operate.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: February 20, 2018
    Assignee: HRL Laboratories, LLC
    Inventor: Kenneth R. Elliott
  • Patent number: 9864215
    Abstract: Provided is a substrate-type optical waveguide, having a phase modulation function, (i) in which a reflection of a signal to be inputted via a coplanar line is restrained and (ii) which consumes less power. In a case where the substrate-type optical waveguide is partitioned into a plurality of sections by cross sections orthogonal to a direction in which light propagates through a core, a local capacitance in each of the plurality of sections gradually increases as a distance from an entrance end surface increases.
    Type: Grant
    Filed: July 25, 2017
    Date of Patent: January 9, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Shinichi Sakamoto, Kazuhiro Goi, Norihiro Ishikura
  • Patent number: 9841618
    Abstract: An optical modulator circuit includes first and second electrodes, first and second p-n junction segments (PNJSs), and first and second optical waveguides. The first PNJS includes a first modulating p-n junction (MPNJ) in series with a first non-modulating device (NMD) that are connected to the first and second electrodes, respectively, where the first NMD includes a first substantially larger capacitance than the first MPNJ. The second PNJS includes a second NMD in series with a second MPNJ that are connected to the first and second electrodes, respectively, where the second NMD includes a second substantially larger capacitance than the second MPNJ. The first and second optical waveguides superimpose the first and second MPNJs, respectively, where the first and second MPNJs are configured to modulate a refractive index of the first and second optical waveguides, respectively, based on the substantially larger capacitance of the first NMD and the second NMD.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: December 12, 2017
    Assignee: Ciena Corporation
    Inventors: Michel Poulin, Yves Painchaud, Alexandre Delisle-Simard
  • Patent number: 9841658
    Abstract: A controllable opto-electronic time stretcher comprising a first wave guide and a second waveguide coupled to the first waveguide along a coupling portion; wherein at least one of the first and second waveguides in the coupling portion has a controllable refractive index.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: December 12, 2017
    Assignee: HRL Laboratories, LLC
    Inventors: Willie W. Ng, Mohiuddin Ahmed, Troy Rockwood
  • Patent number: 9838118
    Abstract: Systems and methods for reducing total skew in optical signals transmitted by optical coherent transponders without measuring the total skew are disclosed. The method may compensate for the in-phase/quadrature (I/Q) skew of optical signals in complex modulation formats. It may include providing input to a transponder to produce a periodic (and generally sinusoidal) output signal, providing the signal to an optical power meter, measuring the optical power of positive and negative harmonics of the signal while varying the amount of skew introduced by a de-skewing filter in the transponder, identifying the amount of skew introduced by the de-skewing filter when the minimum optical power measurement is taken, and causing the amount of skew introduced by the de-skewing filter to equal the identified skew offset by a one-half symbol delay. The system may provide better skew compensation using less expensive equipment than de-skewing methods based on existing skew measurement methods.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: December 5, 2017
    Assignee: Fujitsu Limited
    Inventor: Emilio Bravi
  • Patent number: 9838117
    Abstract: Systems and methods for detecting and correcting bias errors in optical coherent transponders are disclosed. An “outer” modulator in a transponder may, when properly biased, produce a phase offset of ?/2 radians between in-phase and quadrature components of the optical signals transmitted in optical modulation formats by the transponder. The method may include providing input to a transponder to produce a periodic (and generally sinusoidal) output signal, measuring (using an optical power meter) the optical power of positive and negative harmonics of the signal while varying the amount of skew introduced by a de-skewing filter in the transponder, and determining that a curve representing the measurements performed on the positive harmonics and a curve representing the measurements performed on the negative harmonics are not orthogonal. The method may include adjusting the bias voltage of the modulator to make the two curves orthogonal, thus eliminating the bias error.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: December 5, 2017
    Assignee: Fujitsu Limited
    Inventors: Emilio Bravi, Qian Liang
  • Patent number: 9817254
    Abstract: A stabilized integrated optical circuit is presented. The stabilized integrated optical circuit includes at least one integrated optical chip formed from at least one inorganic material, a stabilizing-polarizable-fill gas, and an enclosure enclosing the at least one integrated optical chip and the stabilizing-polarizable-fill gas. At least one surface of the at least one integrated optical chip is modified by a treatment with at least one treatment gas selected to stabilize defects on the at least one surface. The stabilizing-polarizable-fill gas includes N2O and at least one polarizable material.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: November 14, 2017
    Assignee: Honeywell International Inc.
    Inventors: Nancy E. Iwamoto, Steven J. Sanders, Stephen F. Yates, Paul S. Fechner, Austin Taranta
  • Patent number: 9817249
    Abstract: Disclosed herein is a traveling-wave Mach-Zehnder modulator and method of operating same that advantageously exhibits a reduced optical insertion loss as compared with contemporary Mach-Zehnder structures. Such advantage comes at the modest expense of increased modulator length and increased RF loss.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: November 14, 2017
    Assignee: Acacia Communications, Inc.
    Inventor: Christopher Doerr
  • Patent number: 9804426
    Abstract: An electro-absorption modulator, comprising: a substrate layer, including a silicon substrate and an oxide layer disposed on the silicon substrate; top-layer silicon, formed on the oxide layer, where a waveguide layer is formed on the top-layer silicon; a doping layer, including a first doping panel and a second doping panel, where a first-type light doping area is formed on the first doping panel, a second-type light doping area is formed on the second doping panel; and a modulation layer, disposed on the waveguide layer and connected in parallel to the PIN junction. For an incident beam with a specific wavelength, when a modulating electrical signal is reversely applied to the PIN junction, a light absorption coefficient of the modulation layer for the beam changes with the modulating electrical signal, and after the beam passes through a modulation area, optical power of the beam changes.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: October 31, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yaming Li, Buwen Cheng
  • Patent number: 9798164
    Abstract: An electro-optic device 200 comprising a substrate in which first and second waveguides 202, 203 are formed. The device also comprises first and second electrodes 204, 205 comprising an optically transparent conductive material and including primary portions 204a, 205a overlying the first and second waveguides 202, 203 for electrically biasing the first and second waveguides. The device is configured such that one of the first and second electrodes includes one other portion 204b, 205b arranged alongside the primary portion 204a, 205a of the other of the first and second electrodes. This arrangement improves the electro-optic efficiency of the device without the need for a buffer layer in the electrodes.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: October 24, 2017
    Assignee: Oclara Technology Limited
    Inventors: Stefano Balsamo, Marco Villa, Michele Belmonte
  • Patent number: 9739940
    Abstract: A photonic integrated circuit is presented that includes a substrate, and a first and second waveguide patterned on the substrate. The first waveguide guides an input beam of radiation. The photonic integrated circuit also includes a coupling region, wherein the first and second waveguides each pass through the coupling region. One or more modulating elements are coupled to each of the first and second waveguides. The first waveguide and the second waveguide have a first facet and a second facet, respectively, and first and second reflections are generated at the first and second facets within the first and second waveguides, respectively. The one or more modulating elements coupled to each of the first and second waveguides are designed to adjust the phase of the first and second reflections before the first and second reflections pass through the coupling region.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: August 22, 2017
    Assignee: Medlumics S.L.
    Inventors: José Luis Rubio Guivernau, Juan Sancho Durá, Eduardo Margallo Balbás
  • Patent number: 9735542
    Abstract: An optical source is described. This optical source includes a semiconductor optical amplifier, with a semiconductor other than silicon, which provides a gain medium. In addition, a photonic chip, optically coupled to the semiconductor optical amplifier, includes: an optical waveguide that conveys the optical signal; and a pair of ring-resonator modulators that modulate the optical signal. Furthermore, the pair of ring-resonator modulators is included within an optical cavity in the optical source. For example, the optical cavity may be defined by a reflective coating on one edge of the semiconductor optical amplifier and a reflector on one end of the optical waveguide. Alternatively, the optical cavity may be defined by reflectors on ends of the optical waveguide.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: August 15, 2017
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Guoliang Li, Ashok V. Krishnamoorthy, Xuezhe Zheng, Ying Luo
  • Patent number: 9709743
    Abstract: An optical modulator includes a modulating unit, an optical fiber, and a combining unit. The modulating unit outputs first and second optical beams with the electric signal superimposed thereon in a first direction. The optical fiber is placed along a second direction perpendicular to the first direction. The combining unit combines the first and second optical beams output by the modulating unit and outputs an optical beam obtained by the first and second optical beams being combined to the optical fiber. The combining unit includes a polarized light rotating element and a polarized light combining element. The polarized light rotating element rotates the polarization direction of the first optical beam. The polarized light combining element reflects the first optical beam of which the polarization direction has been rotated and the second optical beam in the second direction, and combines the first and second optical beams reflected in the second direction.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: July 18, 2017
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaharu Doi
  • Patent number: 9638942
    Abstract: A novel phase shifter design for carrier depletion based silicon modulators, based on an experimentally validated model, is described. It is believed that the heretofore neglected effect of incomplete ionization will have a significant impact on ultra-responsive phase shifters. A low V?L product of 0.3 V·cm associated with a low propagation loss of 20 dB/cm is expected to be observed. The phase shifter is based on overlapping implantation steps, where the doses and energies are carefully chosen to utilize counter-doping to produce an S-shaped junction. This junction has a particularly attractive V?L figure of merit, while simultaneously achieving attractively low capacitance and optical loss. This improvement will enable significantly smaller Mach-Zehnder modulators to be constructed that nonetheless would have low drive voltages, with substantial decreases in insertion loss. The described fabrication process is of minimal complexity; in particular, no high-resolution lithographic step is required.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: May 2, 2017
    Assignee: Elenion Technologies, LLC
    Inventors: Thomas Baehr-Jones, Yang Liu
  • Patent number: 9588359
    Abstract: An optical module includes: a substrate; a first terminal; a plurality of second terminals; a plurality of third terminals; and a plurality of wirings. The plurality of second terminals are on the substrate. The plurality of third terminals are disposed closer to an electrode than the plurality of second terminals on the substrate. The plurality of wirings extend from the plurality of second terminals through a side opposite to the first terminal and reach the electrode.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: March 7, 2017
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 9507182
    Abstract: A nanocomposite optical modulator device comprising an optically transparent electro-optic region. The electro-optic region exhibiting second-order optical nonlinearity properties. The nanocomposite optical modulator further comprises one or more dielectric layers, with at least one of the dielectric in contact with the electro-optic region, one or more electrodes in proximity to the electro-optic region. Wherein at least one of the aforementioned elements is nanocomposite material with nanoparticle loading from about 0.25% to about 70% volume.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: November 29, 2016
    Assignee: Vadient Optics. LLC.
    Inventor: George Williams
  • Patent number: 9470952
    Abstract: Electro-optical modulators and methods of fabrication are disclosed. An electro-optical modulator includes a Mach-Zehnder interferometer formed in a substrate removed semiconductor layer and a coplanar waveguide. Signals from the coplanar waveguide are capacitively coupled to the Mach-Zehnder interferometer through first and second dielectric layers having strong dielectric constant dispersion.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: October 18, 2016
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventor: Nadir Dagli
  • Patent number: 9470951
    Abstract: CMOS compatible SOI photonic integrated circuits (PICs) offer a low cost and promising solution to future short reach optical links operating beyond 100 Gb/s. A key building block in these optical links is the external optical modulator. Amongst, the PIC geometries for external modulators are those based upon ring resonators and Mach-Zehnder interferometers (MZI) where while the latter have been reported with increased thermal stability and fabrication tolerances, the former have demonstrated lower loss and lower driving voltages leading to a more energy efficient approach. Multi-segmented electrode structure based PAM optical modulator can potentially replace the analog digital-to-analog circuits (DACs) which are commonly used to achieve the multilevel electrical driving signal. Accordingly, it would be beneficial to combine the benefits of ring resonators to provide PAM-N modulators.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: October 18, 2016
    Assignee: The Royal Institution for the Advancement of Learning / McGill University
    Inventors: Odile Liboiron-Ladouceur, Mohammad Shafiqul Hai, Monireh Moayedi Pour Fard
  • Patent number: 9454023
    Abstract: A semiconductor electro-optical phase shifter may include a substrate, an optical waveguide segment (12) formed on the substrate, and first and second zones of opposite conductivity types configured to form a first bipolar junction perpendicular to the substrate. The phase shifter may also include a dynamic control structure configured to reverse bias the first junction and a static control structure configured to direct a quiescent current in the second zone, parallel to the first junction.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: September 27, 2016
    Assignee: STMICROELECTRONICS SA
    Inventor: Jean-Robert Manouvrier
  • Patent number: 9442314
    Abstract: An integrated circuit is described. This integrated circuit includes a ferroelectric layer disposed on top of the ring resonator, which has a resonance wavelength. The ferroelectric layer is positioned between electrical contacts. Moreover, there may be amorphous semiconductor materials between the electrical contacts and the ferroelectric layer. For example, the amorphous semiconductor materials may include: p-type amorphous silicon and/or n-type amorphous silicon. By applying a reverse-bias voltage across the electrical contacts, an electric field is generated in a plane approximately parallel to a top surface of the ring resonator. This electric field electro-optically tunes the resonance wavelength. The ring resonator may operate at low voltage and can be integrated with a silicon optical waveguide on a silicon-on-insulator (SOI) platform.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: September 13, 2016
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: John E. Cunningham, Xuezhe Zheng, Ashok V. Krishnamoorthy
  • Patent number: 9423566
    Abstract: An optical modulator includes a Mach-Zehnder optical waveguide that includes a pair of parallel waveguides, and a two-input-one-output optical coupler that couples light output from the parallel waveguides; a branching waveguide that branches a portion of light output from the optical coupler; and a light receiving unit that receives the light output from the branching waveguide. Orientation of an output end of the branching waveguide is angled toward the light receiving unit, to be oblique with respect to the parallel waveguides, and orientation of an output end of the optical coupler is angled toward a side opposite to that of the output end of the branching waveguide, to be oblique with respect to the parallel waveguides.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: August 23, 2016
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 9405137
    Abstract: A semiconductor electro-optical phase shifter may include an optical action zone configured to be inserted in an optical waveguide, and a bipolar transistor structure configured so that, in operation, collector current of the bipolar transistor structure crosses the optical action zone perpendicular to the axis of the optical waveguide.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: August 2, 2016
    Assignee: STMICROELECTRONICS SA
    Inventor: Jean-Robert Manouvrier
  • Patent number: 9395563
    Abstract: An electro-optic modulator includes a semiconductor substrate, a core region and slab regions. The core region is formed on the semiconductor substrate and includes a first low concentration doping region, a second low concentration doping region and a high concentration doping region formed between the first low concentration doping region and the second low concentration doping region. Slab regions are formed on the semiconductor substrate. The slab regions are in contact with the core region. A width of a depletion region included in the core region may be controlled based on a reverse bias voltage applied between the first low concentration doping region and the second low concentration doping region. If the width of a depletion region is controlled, an optical signal transmitted through the depletion region may be controlled. The electro-optic modulator according to example embodiments may increase an operation speed and decrease a power consumption of a system.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: July 19, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Amir Hossein Nejadmalayeri
  • Patent number: 9337936
    Abstract: An object of the invention is to provide an optical transmission apparatus capable of reducing the influence of nonlinear effect of an optical fiber, suppressing a band requested to a device from being widened, easily bias controlling a modulator, and flexibly switching plural modulation methods. An optical transmission apparatus 301 according to the invention includes a modulator 101 and a controller 102. The modulator 101 is a modulator capable of quadrapture phase-shift keying the light from a light source and outputting the light. The controller 102 controls the input signal to the modulator 101 and causes the modulator 101 to carry out a quadrapture phase-shift keying operation or a ?/2 shift binary phase-shift keying operation.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: May 10, 2016
    Assignee: NEC CORPORATION
    Inventors: Kumi Ito, Kouichi Suzuki
  • Patent number: 9329413
    Abstract: In a new optical intensity modulator, a nonlinear change in refractive index is used to balance the nonlinearities in the optical transfer function in a way that leads to highly linear optical intensity modulation.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: May 3, 2016
    Assignee: Sandia Corporation
    Inventors: Christopher DeRose, Michael R. Watts
  • Patent number: 9326050
    Abstract: An light input/output unit has at least three first ports, including a first input port for inputting light and a first output port for outputting light; at least three second ports, including a second input port for inputting light and a second output port for outputting light; and an alignment port for inputting and outputting alignment light. An optical axis of the input/output light of the first port and an optical axis of the input/output light of the second port differ from each other. The dispersive element changes the optical axes of input/output lights of the first and second ports by an angle corresponding to a wavelength. The light deflective element has a first part for directing the light from the first input port to the first output port and a second part for directing the light from the second input port to the second output port.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: April 26, 2016
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masaki Suzuki, Takafumi Ohtsuka, Takeshi Inoue
  • Patent number: 9323013
    Abstract: In a bidirectional optical communications module, an optics system is provided having a lens block that uses a single surface for reflecting light into or reflecting light passing out of the end of the optical fiber and a single surface for reflecting light toward a monitor photodetector. No other surfaces in the lens block are used to turn the light path. A filter block of the optics system that is adjacent to the lens block performs wavelength multiplexing and demultiplexing. The filter block reflects light at either its lower or upper surface back toward the lens block. In some embodiments, a portion of light passes through the upper surface of the filter block to provide some attenuation of light being transmitted so that the light is not coupled back into the light source. Because the upper surface of the filter block is the topmost surface of the optics system, the optics system can be very compact while also limiting the number of surfaces that turn the light path.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: April 26, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Bing Shao, Ye Chen, Seng-Kum Chan
  • Patent number: 9318785
    Abstract: Methods and apparatus are disclosed for wirelessly communicating among integrated circuits and/or functional modules within the integrated circuits. A semiconductor device fabrication operation uses a predetermined sequence of photographic and/or chemical processing steps to form one or more functional modules onto a semiconductor substrate. The functional modules are coupled to an integrated waveguide that is formed onto the semiconductor substrate and/or attached thereto to form an integrated circuit. The functional modules communicate with each other as well as to other integrated circuits using a multiple access transmission scheme via the integrated waveguide. One or more integrated circuits may be coupled to an integrated circuit carrier to form Multichip Module. The Multichip Module may be coupled to a semiconductor package to form a packaged integrated circuit.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: April 19, 2016
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Rofougaran, Arya Reza Behzad, Sam Ziqun Zhao, Jesus Alfonso Castaneda, Michael Boers
  • Patent number: 9310629
    Abstract: An optical modulator may include a leftmost waveguide, a rightmost waveguide, and a dielectric layer disposed therebetween. In one embodiment, the waveguides may be disposed on the same plane. When a voltage potential is created between the rightmost and leftmost waveguides, these layers form a silicon-insulator-silicon capacitor (also referred to as SISCAP) structure that provides efficient, high-speed optical modulation of an optical signal passing through the modulator. As opposed to a horizontal SISCAP structure where the dielectric layer is disposed between upper and lower waveguides, arranging the dielectric layer between waveguides disposed on the same plane results in a vertical SISCAP structure. In one embodiment, the leftmost and rightmost waveguide are both made from crystalline silicon.
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: April 12, 2016
    Assignee: Cisco Technology, Inc.
    Inventors: Vipulkumar Patel, Prakash Gothoskar
  • Patent number: 9298024
    Abstract: A Mach-Zehnder (MZ) modulator made of semiconductor material and a method to drive the MZ-modulator are disclosed. The MZ-modulator includes a pair of arms to vary the phase of the optical beam propagating therein. One of the arms further provides the phase presetter that varies the phase of the optical beam by ?. The arms are driven by modulation signals complementary to each other but with the DC bias equal to each other.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: March 29, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Shingo Yamanaka
  • Patent number: 9285651
    Abstract: A device, such as a silicon modulator, in accordance with the present disclosure employs PN diodes without sacrificing the modulation depth, while achieving lower loss and better impedance matching to 50-Ohm drivers. In one embodiment, the device includes an input waveguide, an input optical splitter coupled to the input waveguide, first and second optical phase shifters coupled to the input optical splitter, an output optical splitter coupled to the first and second phase shifters, and an output waveguide coupled to the output optical splitter. The phase shifters are designed with variant capacitance per unit length.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: March 15, 2016
    Assignee: SiFotonics Technologies Co, Ltd.
    Inventors: Changhua Chen, Dong Pan, Yanwu Zhang, Wang Chen, Pengfei Cai, Ching-yin Hong, Siying Liu