Takashi Saida - IEEE Xplore Author Profile

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Author details

Takashi Saida

Also published under: T. Saida

Publications

58

Citations

454

Publications by Year

19952022

Co-Authors:

M. AbeAtsushi AratakeShuichiro AsakawaBing ZhuStefano Camatel

Show All Co-Authors (95)

Takashi Saida

Also published under: T. Saida

Affiliation

NTT Network Innovation Laboratories

Yokosuka

Kanagawa, Japan

Publication Topics

Optical Amplifier,
Digital Signal Processing,
Polarization Rotation,
Quadrature Phase Shift Keying,
Beam Polarization,
Bit Error Rate,
Choice Of System,
Coherent Optics,
Coherent Receiver,
Compact Packing,
Continuous Wave,
Digital Oscilloscope

Biography

Takashi Saida (M'99) received the B.S., M.S., and Ph.D. degrees in electrical engineering from Tokyo University, Tokyo, Japan, in 1993, 1995, and 1998, respectively.,From 1996 to 1998, he was a Research Fellow of the Japan Society for the Promotion of Science. In 1998, he joined Nippon Telegraph and Telephone Corporation (NTT), Ibaraki, Japan, where he was involved in research and development on functional silica-based planar lightwave circuits. From 2002 to 2003, he was a visiting scholar at Stanford University, Stanford, CA, USA, on leave from NTT laboratories. In 2006, he joined NTT Electronics Corporation, Ibaraki, and is the Director of Design Group at PLC business unit. He is currently with NTT Device Innovation Center, Kanagawa...

Publications

58

Citations

454

Publications by Year

19952022

Co-Authors:

M. Abe
Atsushi Aratake
Shuichiro Asakawa
Bing Zhu
Stefano Camatel

Show All Co-Authors (95)

Author's Published Works

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Showing 1-25 of 58 results

Conferences (38)

Journals (20)

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Single Year
T. Saida(30)
Takashi Saida(28)
T. Shibata(12)
Hiroshi Yamazaki(12)
H. Takahashi(10)
NTT Photonics Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan(19)
NTT Photonics Laboratories, NTT Corporation, Kanagawa, Japan(7)
NTT Network Innovation Laboratories, Yokosuka, Kanagawa, Japan(3)
NTT Corporation, NTT Device Innovation Center, Atsugi, Kanagawa, Japan(3)
NTT Device Innovation Center, NTT Corporation, Atsugi, Kanagawa, Japan(3)
IEEE Photonics Technology Letters(9)
Journal of Lightwave Technology(9)
2011 37th European Conference and Exhibition on Optical Communication(3)
(CLEO). Conference on Lasers and Electro-Optics, 2005.(2)
2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference(2)
IEEE(58)
Anaheim, CA, USA(6)
Baltimore, MD, USA(5)
Amsterdam, Netherlands(4)
Los Angeles, CA, USA(4)
Chiba, Japan(3)
Refractive Index(12)
Optical Circuits(11)
Output Ports(11)
Coherent Receiver(9)
Excessive Loss(9)

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Results

50-Tb/s (1 Tb/s × 50 ch) WDM Transmission on Two 6.25-THz Bands Using Hybrid Inline Repeater of PPLN-based OPAs and Incoherent-forward-pumped DRA

Takayuki Kobayashi;Shimpei Shimizu;Masanori Nakamura;Takeshi Umeki;Takushi Kazama;Junji Yoshida;Shigehiro Takasaka;Yasuto Tatamida;Hiroto Kawakami;Fukutaro Hamaoka;Munehiko Nagatani;Hiroshi Yamazaki;Kei Watanabe;Takashi Saida;Yutaka Miyamoto

2022 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2022 | Conference Paper |

Cited by: Papers (1)

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We demonstrate 50-Tb/s WDM transmission within 6.25-THz band over 240-km SMF using a novel hybrid inline repeater consisting of PPLN-based OPAs and incoherent-forward-pumped DRA. 1-Tb/s/lambda PS-64QAM channels are transmitted within each the S/C-band or C/L-band. © 2022 The Author(s)Show More

50-Tb/s (1 Tb/s × 50 ch) WDM Transmission on Two 6.25-THz Bands Using Hybrid Inline Repeater of PPLN-based OPAs and Incoherent-forward-pumped DRA

Takayuki Kobayashi;Shimpei Shimizu;Masanori Nakamura;Takeshi Umeki;Takushi Kazama;Junji Yoshida;Shigehiro Takasaka;Yasuto Tatamida;Hiroto Kawakami;Fukutaro Hamaoka;Munehiko Nagatani;Hiroshi Yamazaki;Kei Watanabe;Takashi Saida;Yutaka Miyamoto

2022 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2022 | Conference Paper |

Novel CDC ROADM Architecture Utilizing Low Loss WSS and MCS without Necessity of Inline Amplifier and Filter

Yiran Ma;Kenya Suzuki;Ian Clarke;Ai Yanagihara;Patrick Wong;Takashi Saida;Stefano Camatel

2019 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2019 | Conference Paper |

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A novel CDC ROADM architecture comprising low loss wavelength selective switch and multicast switch is illustrated and experimentally demonstrated. The proposed add/drop structure is designed to eliminate the necessity of additional amplification and filtering.Show More

Novel CDC ROADM Architecture Utilizing Low Loss WSS and MCS without Necessity of Inline Amplifier and Filter

Yiran Ma;Kenya Suzuki;Ian Clarke;Ai Yanagihara;Patrick Wong;Takashi Saida;Stefano Camatel

2019 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2019 | Conference Paper |

Silicon-photonics-based coherent optical subassembly (COSA) for ultra-compact coherent transceiver

Kiyofumi Kikuchi;Ken Tsuzuki;Shin Kamei;Shogo Yamanaka;Shuichiro Asakawa;Toshihiro Itoh;Yusuke Nasu;Kotaro Takeda;Kentaro Honda;Yuriko Kawamura;Makoto Jizodo;Masayuki Takahashi;Mitsuo Usui;Hiroyasu Mawatari;Takashi Saida

2017 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)

Year: 2017 | Conference Paper |

Cited by: Papers (2)

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We actualized a silicon photonics (SiPh)-based coherent optical subassembly (COSA) with a compact and low-height package for the next-generation transceiver form factors. We integrated optical functions required for transmitting and receiving digital coherent optical signals into a single SiPh chip. The COSA is applicable to 100-Gbps dual-polarization quadrature phase shift keying and 200Gbps dual...Show More

Silicon-photonics-based coherent optical subassembly (COSA) for ultra-compact coherent transceiver

Kiyofumi Kikuchi;Ken Tsuzuki;Shin Kamei;Shogo Yamanaka;Shuichiro Asakawa;Toshihiro Itoh;Yusuke Nasu;Kotaro Takeda;Kentaro Honda;Yuriko Kawamura;Makoto Jizodo;Masayuki Takahashi;Mitsuo Usui;Hiroyasu Mawatari;Takashi Saida

2017 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)

Year: 2017 | Conference Paper |

Emerging integrated devices for coherent transmission — Digitally assisted analog optics

2017 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2017 | Conference Paper |

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Digital signal processing has been widening our choice of material systems for optical integration platforms. We review recent work on digital coherent optics, and show our results for high-speed InP modulators and ultra-compact Si-based coherent-optical-subassemblies.Show More

Emerging integrated devices for coherent transmission — Digitally assisted analog optics

2017 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2017 | Conference Paper |

Simulation of high-speed CMOS inverter-based driver for silicon photonic segmented Mach-Zehnder modulator

Masayuki Takahashi;Kotaro Takeda;Ken Tsuzuki;Shinsuke Nakano;Tsutomu Takeya;Takashi Saida

2016 IEEE Region 10 Conference (TENCON)

Year: 2016 | Conference Paper |

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We propose a high-speed and power-efficient CMOS-inverter-based driver for a silicon photonics-based segmented Mach-Zehnder modulator (MZM). The proposed driver is equipped with area-efficient three-dimensional inductors, which are suitable for flip-chip assembly with a compact area and for inductive peaking to increase the data rate. We also employ a dual-drive push-pull configuration to drive th...Show More

Simulation of high-speed CMOS inverter-based driver for silicon photonic segmented Mach-Zehnder modulator

Masayuki Takahashi;Kotaro Takeda;Ken Tsuzuki;Shinsuke Nakano;Tsutomu Takeya;Takashi Saida

2016 IEEE Region 10 Conference (TENCON)

Year: 2016 | Conference Paper |

Si photonics wavelength-adjustable crosstalk suppression filter by using coarse laser trimming

Makoto Jizodo;Shin Kamei;Kiyofumi Kikuchi;Takashi Saida

2015 IEEE 12th International Conference on Group IV Photonics (GFP)

Year: 2015 | Conference Paper |

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We devised a crosstalk suppression filter in Si photonics, whose passband wavelength is adjustable by coarse laser trimming. Results of a proof-of-concept experiment show a crosstalk reduction of 10dB.Show More

Si photonics wavelength-adjustable crosstalk suppression filter by using coarse laser trimming

Makoto Jizodo;Shin Kamei;Kiyofumi Kikuchi;Takashi Saida

2015 IEEE 12th International Conference on Group IV Photonics (GFP)

Year: 2015 | Conference Paper |

Optical Nyquist-filtering multi/demultiplexer with PLC for 1-Tb/s class super-channel transceiver

Takashi Goh;Mikitaka Itoh;Hiroshi Yamazaki;Takashi Saida;Toshikazu Hashimoto

2015 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2015 | Conference Paper |

Cited by: Papers (9) | Patents (1)

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We developed a 37.5-GHz-spaced 8-subcarrier Nyquist-filtering multi/demulti-plexer with inverse sine compensation using integrated planar optics. We successfully demonstrated super-channel generation/reception with an OSNR penalty of 0.2 dB using the multi/demultiplexers and 32-Gbaud DP-QPSK subcarriers.Show More

Optical Nyquist-filtering multi/demultiplexer with PLC for 1-Tb/s class super-channel transceiver

Takashi Goh;Mikitaka Itoh;Hiroshi Yamazaki;Takashi Saida;Toshikazu Hashimoto

2015 Optical Fiber Communications Conference and Exhibition (OFC)

Year: 2015 | Conference Paper |

Design and Fabrication of Mixed Electronics-Optics Modulator for Dual-Carrier QPSK Generation

Kiyofumi Kikuchi;Hideyuki Nosaka;Hiroshi Yamazaki;Munehiko Nagatani;Takashi Goh;Kenji Kurishima;Takashi Saida

Journal of Lightwave Technology

Year: 2015 | Volume: 33, Issue: 15 | Journal Article |

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We discuss in detail the design and fabrication of a mixed electronics-optics (MEO) modulator and related key devices. Our proposed MEO modulator generates dual-carrier quadrature phase-shift keying (QPSK) signals utilizing both analog electrical and optical modulation with a simple optical circuit configuration. The key devices for the MEO modulator include a high-speed electrical-phase modulator...Show More

Design and Fabrication of Mixed Electronics-Optics Modulator for Dual-Carrier QPSK Generation

Kiyofumi Kikuchi;Hideyuki Nosaka;Hiroshi Yamazaki;Munehiko Nagatani;Takashi Goh;Kenji Kurishima;Takashi Saida

Journal of Lightwave Technology

Year: 2015 | Volume: 33, Issue: 15 | Journal Article |

Flexible four-channel silicon-external-cavity laser with a shared ring resonator

Yuriko Kawamura;Hiroshi Yamazaki;Yuta Ueda;Nobuhiro Nunoya;Takashi Saida

2014 IEEE Photonics Conference

Year: 2014 | Conference Paper |

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A four-channel external-cavity laser using one shared ring resonator, which provides a frequency grid, and four slave ring resonator enables us to select the lasing frequencies of the four subchannels from the grid frequencies. A proof-of-concept experiment, performed by butt-coupling an InP semiconductor optical amplifier to a Si wire waveguide external mirror chip, demonstrated lasing of each of...Show More

Flexible four-channel silicon-external-cavity laser with a shared ring resonator

Yuriko Kawamura;Hiroshi Yamazaki;Yuta Ueda;Nobuhiro Nunoya;Takashi Saida

2014 IEEE Photonics Conference

Year: 2014 | Conference Paper |

Simple three-dimensional simplex modulator

Hiroshi Yamazaki;Yasuaki Hashizume;Takashi Saida

Year: 2014 | Conference Paper |

Cited by: Papers (1)

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We devised a simple 3D simplex modulator containing only two Mach-Zehnder sub-modulators. The modulator has smaller intrinsic modulation loss than that with the conventional configuration. It operated at 43 Gb/s.Show More

Simple three-dimensional simplex modulator

Hiroshi Yamazaki;Yasuaki Hashizume;Takashi Saida

Year: 2014 | Conference Paper |

Ultra-compact and low-loss silica-based dual polarization optical hybrid for digital coherent receiver with excellent common-mode rejection ratio

Takayuki Mizuno;Takashi Saida;Yusuke Nasu;Takashi Yamada;Yasuaki Hashizume;Hiroshi Takahashi

2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC)

Year: 2013 | Conference Paper |

Cited by: Papers (5) | Patents (1)

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An ultra-compact 3 × 12 mm2 DPOH on a 1.5%-Δ silica-based PLC employing a novel coupler is reported. The excess loss is <;2 dB and the CMRR is <;-27 dBe over the C- and L-bands.Show More

Ultra-compact and low-loss silica-based dual polarization optical hybrid for digital coherent receiver with excellent common-mode rejection ratio

Takayuki Mizuno;Takashi Saida;Yusuke Nasu;Takashi Yamada;Yasuaki Hashizume;Hiroshi Takahashi

2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC)

Year: 2013 | Conference Paper |

Transmitter synthesis for advanced modulation formats utilizing silica-LiNbO3 hybrid integration technology

Shinji Mino;Hiroshi Yamazaki;Takashi Goh;Takashi Saida

2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC)

Year: 2013 | Conference Paper |

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Silica-LiNbO3 hybrid integration has opened up the possibility of synthesizing advanced transmitters, including dual-carrier 16 QAM modulators and flexible-format modulators. They can provide the best mix of optics and electronics, and are the key to future optical transport systems.Show More

Transmitter synthesis for advanced modulation formats utilizing silica-LiNbO3 hybrid integration technology

Shinji Mino;Hiroshi Yamazaki;Takashi Goh;Takashi Saida

2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC)

Year: 2013 | Conference Paper |

Dual-Carrier Dual-Polarization IQ Modulator Using a Complementary Frequency Shifter

Hiroshi Yamazaki;Takashi Saida;Takashi Goh;Shinji Mino;Munehiko Nagatani;Hideyuki Nosaka;Koichi Murata

IEEE Journal of Selected Topics in Quantum Electronics

Year: 2013 | Volume: 19, Issue: 6 | Journal Article |

Cited by: Papers (16)

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We discuss the detailed characteristics of a dual-carrier dual-polarization (DP) in-phase-and-quadrature (IQ) modulator. As the dual-carrier generator, we used a complementary frequency shifter (CFS), which generates two frequency-spacing-locked optical subcarriers and outputs each of them from different output ports without any optical demultiplexers. We fabricated the modulator, which integrates...Show More

Dual-Carrier Dual-Polarization IQ Modulator Using a Complementary Frequency Shifter

Hiroshi Yamazaki;Takashi Saida;Takashi Goh;Shinji Mino;Munehiko Nagatani;Hideyuki Nosaka;Koichi Murata

IEEE Journal of Selected Topics in Quantum Electronics

Year: 2013 | Volume: 19, Issue: 6 | Journal Article |

Flexible-Format Modulator With a Lattice Configuration

Hiroshi Yamazaki;Takashi Goh;Takashi Saida;Shinji Mino

IEEE Journal of Selected Topics in Quantum Electronics

Year: 2013 | Volume: 19, Issue: 6 | Journal Article |

Cited by: Papers (5)

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We discuss the general design concept of lattice optical modulators and detailed characteristics of a flexible-format modulator with a lattice configuration. Compared to the conventional modulators, the lattice modulator provides smaller intrinsic signal-synthesis losses because it utilizes both of the two complementary quadrature-phase-shift-keying (QPSK) signals to synthesize higher-order signal...Show More

Flexible-Format Modulator With a Lattice Configuration

Hiroshi Yamazaki;Takashi Goh;Takashi Saida;Shinji Mino

IEEE Journal of Selected Topics in Quantum Electronics

Year: 2013 | Volume: 19, Issue: 6 | Journal Article |

In-band OSNR monitor for DP-QPSK signal with high-speed integrated Stokes polarimeter

Takashi Saida;Ikuo Ogawa;Takayuki Mizuno;Kimikazu Sano;Hiroyuki Fukuyama;Yoshifumi Muramoto;Yasuaki Hashizume;Hideyuki Nosaka;Koichi Murata

2012 38th European Conference and Exhibition on Optical Communications

Year: 2012 | Conference Paper |

Cited by: Papers (2)

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We propose an in-band OSNR monitor based on high-speed polarization analysis. We fabricated a high-speed integrated Stokes polarimeter with a PLC-based polarization filter, high-speed photodiodes and trans-impedance amplifiers, and carried out proof-of-concept experiments with 100-Gb/s DP-QPSK signals.Show More

In-band OSNR monitor for DP-QPSK signal with high-speed integrated Stokes polarimeter

Takashi Saida;Ikuo Ogawa;Takayuki Mizuno;Kimikazu Sano;Hiroyuki Fukuyama;Yoshifumi Muramoto;Yasuaki Hashizume;Hideyuki Nosaka;Koichi Murata

2012 38th European Conference and Exhibition on Optical Communications

Year: 2012 | Conference Paper |

Dual-carrier dual-polarization IQ modulator driven with high-speed DACs for 400-Gb/s applications

Hiroshi Yamazaki;Takashi Goh;Takashi Saida;Yasuaki Hashizume;Shinji Mino;Munehiko Nagatani;Hideyuki Nosaka;Koichi Murata

2012 38th European Conference and Exhibition on Optical Communications

Year: 2012 | Conference Paper |

Cited by: Papers (3) | Patents (2)

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An optical dual-carrier generator, four parallel IQ modulators, and a polarization multiplexer are integrated in a single modulator with a silica-LiNbO3 hybrid configuration. By driving the modulator with high-speed DACs we developed, we generated a 400-Gb/s dual-carrier dual-polarization 16QAM signal.Show More

Dual-carrier dual-polarization IQ modulator driven with high-speed DACs for 400-Gb/s applications

Hiroshi Yamazaki;Takashi Goh;Takashi Saida;Yasuaki Hashizume;Shinji Mino;Munehiko Nagatani;Hideyuki Nosaka;Koichi Murata

2012 38th European Conference and Exhibition on Optical Communications

Year: 2012 | Conference Paper |

Design and evaluation of highly reliable silica-LiNbO3 hybrid modulators for advanced formats

Ken Tsuzuki;Takashi Saida;Motohaya Ishii;Takashi Goh;Hiroshi Yamazaki;Yoshiyuki Doi;Atsushi Aratake;Takao Fukumitsu;Munehisa Tamura;Shinji Mino

Year: 2012 | Conference Paper |

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Silica/LiNbO3 hybrid integration enables us to realize compact and low-loss optical modulators for advanced formats. We propose a hybrid modulator design to mitigate the difference between the thermal expansion of a silicon substrate and LiNbO3, and report the evaluation results.Show More

Design and evaluation of highly reliable silica-LiNbO3 hybrid modulators for advanced formats

Ken Tsuzuki;Takashi Saida;Motohaya Ishii;Takashi Goh;Hiroshi Yamazaki;Yoshiyuki Doi;Atsushi Aratake;Takao Fukumitsu;Munehisa Tamura;Shinji Mino

Year: 2012 | Conference Paper |

IQ-coupling-loss-free polarization-switched QPSK modulator

Hiroshi Yamazaki;Takashi Goh;Takashi Saida;Yasuaki Hashizume;Shinji Mino

Year: 2012 | Conference Paper |

Cited by: Patents (2)

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We devised and fabricated a simple polarization-switched QPSK modulator free from the 3-dB IQ-coupling loss. It consists of only three Mach-Zehnder BPSK modulators and a polarization-coupling circuit, and operated at 43 and 84 Gb/s.Show More

IQ-coupling-loss-free polarization-switched QPSK modulator

Hiroshi Yamazaki;Takashi Goh;Takashi Saida;Yasuaki Hashizume;Shinji Mino

Year: 2012 | Conference Paper |

100-Gbit/s PDM-QPSK coherent receiver with wide dynamic range and excellent common-mode rejection ratio

Koichi Murata;Takashi Saida;Kimikazu Sano;Ikuo Ogawa;Hiroyuki Fukuyama;Ryoichi Kasahara;Yoshifumi Muramoto;Hideyuki Nosaka;Satoshi Tsunashima;Takayuki Mizuno;Hiromasa Tanobe;Kuninori Hattori;Toshihide Yoshimatsu;Hiroto Kawakami;Eiji Yoshida

2011 37th European Conference and Exhibition on Optical Communication

Year: 2011 | Conference Paper |

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We report the design and fabrication of a hybrid-integration-type coherent receiver. We optimize the receiver building blocks, and achieve a -25-dB common-mode rejection ratio and a 20-dB signal input power dynamic range.Show More

100-Gbit/s PDM-QPSK coherent receiver with wide dynamic range and excellent common-mode rejection ratio

Koichi Murata;Takashi Saida;Kimikazu Sano;Ikuo Ogawa;Hiroyuki Fukuyama;Ryoichi Kasahara;Yoshifumi Muramoto;Hideyuki Nosaka;Satoshi Tsunashima;Takayuki Mizuno;Hiromasa Tanobe;Kuninori Hattori;Toshihide Yoshimatsu;Hiroto Kawakami;Eiji Yoshida

2011 37th European Conference and Exhibition on Optical Communication

Year: 2011 | Conference Paper |

Temperature insensitive and ultra wideband silica-based dual polarization optical hybrid for coherent receiver with highly symmetrical interferometer design

Yusuke Nasu;Takayuki Mizuno;Ryoichi Kasahara;Takashi Saida

2011 37th European Conference and Exhibition on Optical Communication

Year: 2011 | Conference Paper |

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We designed temperature-insensitive dual-polarization optical hybrids for the coherent receivers, and firstly demonstrated temperature-insensitive performance with a polarization extinction ratio over 25 dB and phase errors within 3 degrees over fully C-and L-bands.Show More

Temperature insensitive and ultra wideband silica-based dual polarization optical hybrid for coherent receiver with highly symmetrical interferometer design

Yusuke Nasu;Takayuki Mizuno;Ryoichi Kasahara;Takashi Saida

2011 37th European Conference and Exhibition on Optical Communication

Year: 2011 | Conference Paper |

Dual-carrier IQ modulator using a complementary frequency shifter

Hiroshi Yamazaki;Takashi Saida;Takashi Goh;Atsushi Mori;Shinji Mino

2011 37th European Conference and Exhibition on Optical Communication

Year: 2011 | Conference Paper |

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We devised a dual-carrier IQ modulator incorporating a novel complementary frequency shifter. The modulator was fabricated with a PLC-LiNbO3 hybrid integrated circuit, and it successfully generated a 100-Gb/s/pol OFDM-QPSK signal.Show More

Dual-carrier IQ modulator using a complementary frequency shifter

Hiroshi Yamazaki;Takashi Saida;Takashi Goh;Atsushi Mori;Shinji Mino

2011 37th European Conference and Exhibition on Optical Communication

Year: 2011 | Conference Paper |

100-Gbit/s PDM-QPSK Integrated Coherent Receiver Front-End for Optical Communications

Koichi Murata;Takashi Saida;Ikuo Ogawa;Ryoichi Kasahara;Yoshifumi Muramoto;Hiroyuki Fukuyama;Kimikazu Sano;Hideyuki Nosaka;Hiroto Kawakami

2011 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)

Year: 2011 | Conference Paper |

Cited by: Papers (1) | Patents (2)

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This paper describes device and integration technologies for 100-Gbit/s polarization division multiplexed quadrature phase shift keying integrated coherent receiver front-end. The silica-based planar lightwave circuits for the optical passive circuits, InP-based photodiode for the opto-electrical conversion, and InP HBT for the transimpedance amplification are used to achieve high-performance. A m...Show More

100-Gbit/s PDM-QPSK Integrated Coherent Receiver Front-End for Optical Communications

Koichi Murata;Takashi Saida;Ikuo Ogawa;Ryoichi Kasahara;Yoshifumi Muramoto;Hiroyuki Fukuyama;Kimikazu Sano;Hideyuki Nosaka;Hiroto Kawakami

2011 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)

Year: 2011 | Conference Paper |

Silica-based adaptive-delay DPSK demodulator with a cascaded Mach-Zehnder interferometer configuration

Yusuke Nasu;Kuninori Hattori;Takashi Saida;Yasuaki Hashizume;Yohei Sakamaki

36th European Conference and Exhibition on Optical Communication

Year: 2010 | Conference Paper |

Cited by: Papers (4)

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A novel cascaded Mach-Zehnder interferometer configuration is proposed for an adaptive delay DPSK demodulator. We demonstrate that the 2-cascaded MZI configuration can realize three delay settings substantially, and can suppress the penalty caused by bandwidth narrowing at cascaded ROADM filters.Show More

Silica-based adaptive-delay DPSK demodulator with a cascaded Mach-Zehnder interferometer configuration

Yusuke Nasu;Kuninori Hattori;Takashi Saida;Yasuaki Hashizume;Yohei Sakamaki

36th European Conference and Exhibition on Optical Communication

Year: 2010 | Conference Paper |

Low-Loss Y-Branch Waveguides Designed by Wavefront Matching Method

Yohei Sakamaki;Takashi Saida;Toshikazu Hashimoto;Hiroshi Takahashi

Journal of Lightwave Technology

Year: 2009 | Volume: 27, Issue: 9 | Journal Article |

Cited by: Papers (23) | Patents (2)

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In this paper, we describe the procedure for designing low-loss Y-branch waveguides by the wavefront matching (WFM) method, and report experimental results as proof of concept. The designed Y-branches were fabricated using silica-based planar lightwave circuit (PLC) technology. A Y-branch fabricated with a 0.45%-$\Delta$ waveguide exhibited a low excess loss of less than 0.2 dB over a wide wavele...Show More

Low-Loss Y-Branch Waveguides Designed by Wavefront Matching Method

Yohei Sakamaki;Takashi Saida;Toshikazu Hashimoto;Hiroshi Takahashi

Journal of Lightwave Technology

Year: 2009 | Volume: 27, Issue: 9 | Journal Article |

Loss Reduction of Waveguide Crossings by Wavefront Matching Method and Their Application to Integrated Optical Circuits

Yohei Sakamaki;Takashi Saida;Toshikazu Hashimoto;Shin Kamei;Hiroshi Takahashi

Journal of Lightwave Technology

Year: 2009 | Volume: 27, Issue: 13 | Journal Article |

Cited by: Papers (19)

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This paper describes a waveguide crossing design that uses the wavefront matching (WFM) method. The WFM method enables us to design waveguide crossings with lower loss than simple crossings composed of two straight waveguides, without any crosstalk degradation. We report the procedure for designing waveguide crossings based on the WFM method and some experimental results. For experimental confirma...Show More

Loss Reduction of Waveguide Crossings by Wavefront Matching Method and Their Application to Integrated Optical Circuits

Yohei Sakamaki;Takashi Saida;Toshikazu Hashimoto;Shin Kamei;Hiroshi Takahashi

Journal of Lightwave Technology

Year: 2009 | Volume: 27, Issue: 13 | Journal Article |

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