The Experts below are selected from a list of 4929 Experts worldwide ranked by ideXlab platform

Yoshiaki Nakano - One of the best experts on this subject based on the ideXlab platform.

  • efficient ingaasp mqw based Polarization Controller without active passive integration
    Optics Express, 2021
    Co-Authors: Maiko Ito, Takuo Tanemura, Kosuke Okawa, Takahiro Suganuma, Taichiro Fukui, Eisaku Kato, Yoshiaki Nakano
    Abstract:

    Carrier-injection-based efficient Polarization Controller with a strained InGaAsP multiple-quantum-well (MQW) layer is demonstrated on a regrowth-free InP platform. We employ a straight-line device configuration by cascading an asymmetric Polarization rotator (PR) to provide a fixed Polarization conversion and a Polarization-dependent phase shifter (PD-PS) to enable tunable Polarization rotation. Based on a novel design concept, both the PR and PD-PS sections are integrated monolithically without active-passive integration. Using the fabricated device, we experimentally demonstrate efficient Polarization conversion over the entire Poincare sphere with a total current of less than 40 mA. With the capability of monolithically integrating other InP-based active components, the demonstrated scheme should be attractive for various applications, such-as low-cost coherent communication, microwave photonics, and quantum key distribution.

  • monolithic Polarization Controller on regrowth free ingaasp inp platform with strained mqw layer
    Optical Fiber Communication Conference, 2020
    Co-Authors: Kosuke Okawa, Takuo Tanemura, Takahiro Suganuma, Yoshiaki Nakano
    Abstract:

    Carrier-injection-based Polarization Controller with strained MQW layer is demonstrated. Based on novel design concept, both Polarization-rotating and phase-shifting sections are integrated monolithically on regrowth-free InGaAsP/InP platform to achieve efficient conversion over the entire Poincare sphere.

  • OFC - Monolithic Polarization Controller on Regrowth-Free InGaAsP/InP Platform with Strained MQW Layer
    Optical Fiber Communication Conference (OFC) 2020, 2020
    Co-Authors: Maiko Ito, Takuo Tanemura, Kosuke Okawa, Takahiro Suganuma, Yoshiaki Nakano
    Abstract:

    Carrier-injection-based Polarization Controller with strained MQW layer is demonstrated. Based on novel design concept, both Polarization-rotating and phase-shifting sections are integrated monolithically on regrowth-free InGaAsP/InP platform to achieve efficient conversion over the entire Poincare sphere.

  • high speed carrier injection based Polarization Controller with ingaalas inalas multiple quantum wells
    IEEE Photonics Technology Letters, 2017
    Co-Authors: Mohiyuddin Kazi, Samir Ghosh, Hassanet Sodabanlu, Kentaro Suzuki, Masakazu Sugiyama, Takuo Tanemura, Yoshiaki Nakano
    Abstract:

    We demonstrate a waveguide-based Polarization Controller that monolithically incorporates an active InGaAlAs/ InAlAs multiple-quantum-well phase shifter and a passive half-ridge Polarization converter on InP. The butt-joint active/passive integration technique and self-aligned waveguide fabrication steps are employed. Using the fabricated device, efficient rotation of the Stokes vector over $\pi$ radian is obtained on the Poincare sphere by injecting 14-mA current to a 1.4-mm-long phase shifter. Dynamic response time below 5 ns is also confirmed, demonstrating the feasibility of low-power high-speed integrated Polarization Controller on InP.

  • High-Speed Carrier-Injection-Based Polarization Controller With InGaAlAs/InAlAs Multiple-Quantum Wells
    IEEE Photonics Technology Letters, 2017
    Co-Authors: Mohiyuddin Kazi, Samir Ghosh, Hassanet Sodabanlu, Kentaro Suzuki, Masakazu Sugiyama, Takuo Tanemura, Yoshiaki Nakano
    Abstract:

    We demonstrate a waveguide-based Polarization Controller that monolithically incorporates an active InGaAlAs/ InAlAs multiple-quantum-well phase shifter and a passive half-ridge Polarization converter on InP. The butt-joint active/passive integration technique and self-aligned waveguide fabrication steps are employed. Using the fabricated device, efficient rotation of the Stokes vector over $\pi$ radian is obtained on the Poincare sphere by injecting 14-mA current to a 1.4-mm-long phase shifter. Dynamic response time below 5 ns is also confirmed, demonstrating the feasibility of low-power high-speed integrated Polarization Controller on InP.

V. Mirvoda - One of the best experts on this subject based on the ideXlab platform.

  • versatile endless optical Polarization Controller tracker demultiplexer
    Optics Express, 2014
    Co-Authors: B. Koch, Reinhold Noe, David Sandel, V. Mirvoda
    Abstract:

    Following an initial discussion of control error signal generation, we present new developments and applications of automatic endless optical Polarization control based on a commercial electrooptic LiNbO3 Polarization transformer: (i) Fast tracking and subsequent demultiplexing of DPSK/DQPSK/QAM Polarization channels was hitherto limited to a fairly fixed optical input power. With APD photoreceivers used for residual interference detection, we demonstrate here an optical level tolerance of at least 7 dB, compared to only 3 dB for PIN photoreceivers. DPSK channel Polarizations are tracked at up to 40 krad/s and higher speed on the Poincare sphere. (ii) High-order optical modulation schemes require increased accuracy of the Polarization Controller in the demultiplexer. This is possible at the expense of a reduced tracking speed. We achieve a mean Polarization extinction ratio of >40 dB or <0.02 rad error while tracking arbitrary endless Polarization changes of up to 1000 rad/s. (iii) While electronic Polarization tracking in coherent receivers is currently limited to a symbol rate of about 28 GBaud we show optical Polarization tracking of a signal with 1 THz bandwidth.

  • Versatile endless optical Polarization Controller/tracker/demultiplexer.
    Optics express, 2014
    Co-Authors: B. Koch, Reinhold Noe, David Sandel, V. Mirvoda
    Abstract:

    Following an initial discussion of control error signal generation, we present new developments and applications of automatic endless optical Polarization control based on a commercial electrooptic LiNbO3 Polarization transformer: (i) Fast tracking and subsequent demultiplexing of DPSK/DQPSK/QAM Polarization channels was hitherto limited to a fairly fixed optical input power. With APD photoreceivers used for residual interference detection, we demonstrate here an optical level tolerance of at least 7 dB, compared to only 3 dB for PIN photoreceivers. DPSK channel Polarizations are tracked at up to 40 krad/s and higher speed on the Poincare sphere. (ii) High-order optical modulation schemes require increased accuracy of the Polarization Controller in the demultiplexer. This is possible at the expense of a reduced tracking speed. We achieve a mean Polarization extinction ratio of >40 dB or

Takuo Tanemura - One of the best experts on this subject based on the ideXlab platform.

  • efficient ingaasp mqw based Polarization Controller without active passive integration
    Optics Express, 2021
    Co-Authors: Maiko Ito, Takuo Tanemura, Kosuke Okawa, Takahiro Suganuma, Taichiro Fukui, Eisaku Kato, Yoshiaki Nakano
    Abstract:

    Carrier-injection-based efficient Polarization Controller with a strained InGaAsP multiple-quantum-well (MQW) layer is demonstrated on a regrowth-free InP platform. We employ a straight-line device configuration by cascading an asymmetric Polarization rotator (PR) to provide a fixed Polarization conversion and a Polarization-dependent phase shifter (PD-PS) to enable tunable Polarization rotation. Based on a novel design concept, both the PR and PD-PS sections are integrated monolithically without active-passive integration. Using the fabricated device, we experimentally demonstrate efficient Polarization conversion over the entire Poincare sphere with a total current of less than 40 mA. With the capability of monolithically integrating other InP-based active components, the demonstrated scheme should be attractive for various applications, such-as low-cost coherent communication, microwave photonics, and quantum key distribution.

  • monolithic Polarization Controller on regrowth free ingaasp inp platform with strained mqw layer
    Optical Fiber Communication Conference, 2020
    Co-Authors: Kosuke Okawa, Takuo Tanemura, Takahiro Suganuma, Yoshiaki Nakano
    Abstract:

    Carrier-injection-based Polarization Controller with strained MQW layer is demonstrated. Based on novel design concept, both Polarization-rotating and phase-shifting sections are integrated monolithically on regrowth-free InGaAsP/InP platform to achieve efficient conversion over the entire Poincare sphere.

  • OFC - Monolithic Polarization Controller on Regrowth-Free InGaAsP/InP Platform with Strained MQW Layer
    Optical Fiber Communication Conference (OFC) 2020, 2020
    Co-Authors: Maiko Ito, Takuo Tanemura, Kosuke Okawa, Takahiro Suganuma, Yoshiaki Nakano
    Abstract:

    Carrier-injection-based Polarization Controller with strained MQW layer is demonstrated. Based on novel design concept, both Polarization-rotating and phase-shifting sections are integrated monolithically on regrowth-free InGaAsP/InP platform to achieve efficient conversion over the entire Poincare sphere.

  • high speed carrier injection based Polarization Controller with ingaalas inalas multiple quantum wells
    IEEE Photonics Technology Letters, 2017
    Co-Authors: Mohiyuddin Kazi, Samir Ghosh, Hassanet Sodabanlu, Kentaro Suzuki, Masakazu Sugiyama, Takuo Tanemura, Yoshiaki Nakano
    Abstract:

    We demonstrate a waveguide-based Polarization Controller that monolithically incorporates an active InGaAlAs/ InAlAs multiple-quantum-well phase shifter and a passive half-ridge Polarization converter on InP. The butt-joint active/passive integration technique and self-aligned waveguide fabrication steps are employed. Using the fabricated device, efficient rotation of the Stokes vector over $\pi$ radian is obtained on the Poincare sphere by injecting 14-mA current to a 1.4-mm-long phase shifter. Dynamic response time below 5 ns is also confirmed, demonstrating the feasibility of low-power high-speed integrated Polarization Controller on InP.

  • High-Speed Carrier-Injection-Based Polarization Controller With InGaAlAs/InAlAs Multiple-Quantum Wells
    IEEE Photonics Technology Letters, 2017
    Co-Authors: Mohiyuddin Kazi, Samir Ghosh, Hassanet Sodabanlu, Kentaro Suzuki, Masakazu Sugiyama, Takuo Tanemura, Yoshiaki Nakano
    Abstract:

    We demonstrate a waveguide-based Polarization Controller that monolithically incorporates an active InGaAlAs/ InAlAs multiple-quantum-well phase shifter and a passive half-ridge Polarization converter on InP. The butt-joint active/passive integration technique and self-aligned waveguide fabrication steps are employed. Using the fabricated device, efficient rotation of the Stokes vector over $\pi$ radian is obtained on the Poincare sphere by injecting 14-mA current to a 1.4-mm-long phase shifter. Dynamic response time below 5 ns is also confirmed, demonstrating the feasibility of low-power high-speed integrated Polarization Controller on InP.

B. Koch - One of the best experts on this subject based on the ideXlab platform.

  • versatile endless optical Polarization Controller tracker demultiplexer
    Optics Express, 2014
    Co-Authors: B. Koch, Reinhold Noe, David Sandel, V. Mirvoda
    Abstract:

    Following an initial discussion of control error signal generation, we present new developments and applications of automatic endless optical Polarization control based on a commercial electrooptic LiNbO3 Polarization transformer: (i) Fast tracking and subsequent demultiplexing of DPSK/DQPSK/QAM Polarization channels was hitherto limited to a fairly fixed optical input power. With APD photoreceivers used for residual interference detection, we demonstrate here an optical level tolerance of at least 7 dB, compared to only 3 dB for PIN photoreceivers. DPSK channel Polarizations are tracked at up to 40 krad/s and higher speed on the Poincare sphere. (ii) High-order optical modulation schemes require increased accuracy of the Polarization Controller in the demultiplexer. This is possible at the expense of a reduced tracking speed. We achieve a mean Polarization extinction ratio of >40 dB or <0.02 rad error while tracking arbitrary endless Polarization changes of up to 1000 rad/s. (iii) While electronic Polarization tracking in coherent receivers is currently limited to a symbol rate of about 28 GBaud we show optical Polarization tracking of a signal with 1 THz bandwidth.

  • Versatile endless optical Polarization Controller/tracker/demultiplexer.
    Optics express, 2014
    Co-Authors: B. Koch, Reinhold Noe, David Sandel, V. Mirvoda
    Abstract:

    Following an initial discussion of control error signal generation, we present new developments and applications of automatic endless optical Polarization control based on a commercial electrooptic LiNbO3 Polarization transformer: (i) Fast tracking and subsequent demultiplexing of DPSK/DQPSK/QAM Polarization channels was hitherto limited to a fairly fixed optical input power. With APD photoreceivers used for residual interference detection, we demonstrate here an optical level tolerance of at least 7 dB, compared to only 3 dB for PIN photoreceivers. DPSK channel Polarizations are tracked at up to 40 krad/s and higher speed on the Poincare sphere. (ii) High-order optical modulation schemes require increased accuracy of the Polarization Controller in the demultiplexer. This is possible at the expense of a reduced tracking speed. We achieve a mean Polarization extinction ratio of >40 dB or

Qianjin Xiong - One of the best experts on this subject based on the ideXlab platform.

  • optimizing the operation of hbox linbo _ 3 based multistage Polarization Controllers through an adaptive algorithm
    IEEE Photonics Journal, 2010
    Co-Authors: Lixia Xi, Xiaoguang Zhang, Feng Tian, Xianfeng Tang, Xuan Weng, Guangyong Zhang, Xixiang Li, Qianjin Xiong
    Abstract:

    The LiNbO3-based Polarization Controller is widely used, but it needs to be calibrated in order to cancel the remaining birefringence. The calibration of the LiNbO3 Polarization Controller is untrivial because there are several stages, and for each stage, at least four parameters, including VA, Bias, VC, Bias, V 0, and V ? , need to be calibrated. A smart calibration approach is presented theoretically and experimentally. The particle swarm optimization (PSO) algorithm is used as an adaptive searching algorithm. The experiment results show that the PSO algorithm is powerful to optimize the operation of LiNbO3-based multistage Polarization Controllers. It takes only less than 1 min for all the stages of the Polarization Controller to be thoroughly calibrated.

  • Optimizing the Operation of $\hbox{LiNbO}_{3}$ -Based Multistage Polarization Controllers Through an Adaptive Algorithm
    IEEE Photonics Journal, 2010
    Co-Authors: Xiaoguang Zhang, Feng Tian, Xianfeng Tang, Xuan Weng, Guangyong Zhang, Qianjin Xiong
    Abstract:

    The LiNbO3-based Polarization Controller is widely used, but it needs to be calibrated in order to cancel the remaining birefringence. The calibration of the LiNbO3 Polarization Controller is untrivial because there are several stages, and for each stage, at least four parameters, including VA, Bias, VC, Bias, V 0, and V ? , need to be calibrated. A smart calibration approach is presented theoretically and experimentally. The particle swarm optimization (PSO) algorithm is used as an adaptive searching algorithm. The experiment results show that the PSO algorithm is powerful to optimize the operation of LiNbO3-based multistage Polarization Controllers. It takes only less than 1 min for all the stages of the Polarization Controller to be thoroughly calibrated.