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40-Gbit/s EADFB laser integrated with short cavity SOA improving chirp characteristics with low power consumption
W. Kobayashi;M. Arai;T. Fujisawa;Y. Shibata;T. Sato;T. Ito;K. Hasebe;T. Yamanaka;H. Sanjoh
2014 The European Conference on Optical Communication (ECOC)
Year: 2014 | Conference Paper |
Cited by: Papers (4)
High-speed directly modulated laser for applications beyond 100GbE
Wataru Kobayashi;Takeshi Fujisawa;Toshio Ito;Takayuki Yamanaka;Yasuo Shibata;Takashi Tadokoro;Hiroaki Sanjoh
2013 International Conference on Indium Phosphide and Related Materials (IPRM)
Year: 2013 | Conference Paper |
Cited by: Papers (2)
Novel planar structure single-RF drive MZ optical modulator on InP(110) substrate
Yoshihiro Ogiso;Masakazu Arai;Eiichi Yamada;Hiromasa Tanobe;Yasuo Shibata;Masaki Kohtoku
2013 International Conference on Indium Phosphide and Related Materials (IPRM)
Year: 2013 | Conference Paper |
A MZ optical modulator (MZM) with a novel planar structure was proposed. A single-RF drive push-pull MZM with a simple coplanar waveguide (CPW) was fabricated by utilizing a (110)-oriented InP substrate in terms of the crystallographic orientation dependence of the electro-optic Pockels effect. The device exhibits a 3 dB-EO bandwidth of 30 GHz and 40 Gb/s NRZ high speed modulation.Show More
50-Gb/s Direct Modulation of a 1.3-μm InGaAlAs-Based DFB Laser With a Ridge Waveguide Structure
Wataru Kobayashi;Toshio Ito;Takayuki Yamanaka;Takeshi Fujisawa;Yasuo Shibata;Takeshi Kurosaki;Masaki Kohtoku;Takashi Tadokoro;Hiroaki Sanjoh
We demonstrate 50-Gb/s direct modulation by using 1.3-μm distributed-feedback lasers with a ridge waveguide structure. We employed InGaAlAs material for a multiple-quantum well to obtain a low damping factor K, and fabricated a ridge waveguide structure buried in benzocyclobutene to realize a structure with a low parasitic capacitance. In addition, to obtain high maximum frequency relaxation oscil...Show More
High-Speed InP-Based Mach-Zehnder Modulator for Advanced Modulation Formats
2012 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)
Year: 2012 | Conference Paper |
Cited by: Papers (26)
We present a traveling-wave-electrode InP-based Mach-Zehnder (MZ) modulator that employs an n-p-i-n waveguide structure. The structure provides low electrical and optical propagation losses, which enables the modulator to operate at a high baud rate with a low driving voltage and a low optical insertion loss. We developed a compact 40-Gb/s differential phase shift keying (DPSK) tunable wavelength ...Show More
Clarification of the degradation modes of an InP-based semiconductor MZ modulator
Hiroyasu Mawatari;Takako Yasui;Kei Watanabe;Mitsuteru Ishikawa;Eiichi Yamada;Yasuo Shibata;Hiroyuki Ishii
2012 IEEE International Reliability Physics Symposium (IRPS)
Year: 2012 | Conference Paper |
Cited by: Papers (5)
We clarified the degradation modes of an InP-based semiconductor optical Mach-Zehnder modulator (MZM) using high-power light-injected accelerated aging tests. Degradation clearly occurred at the light injected side of the edge on the electric field applied region. We found that the degradation threshold depends strongly on temperature, wavelength and bias voltage. By correlating these parameters, ...Show More
Clarification of the Change in the Extinction Characteristics of an InP-Based Mach–Zehnder Modulator
Hiroyasu Mawatari;Mitsuteru Ishikawa;Takako Yasui;Yasuo Shibata;Eiichi Yamada;Nobuhiro Kikuchi;Hiroyuki Ishii
IEEE Photonics Technology Letters
Cited by: Papers (1)
The stability of the extinction characteristics of an InP-based Mach-Zehnder modulator is clarified in detail. The changes in the half-wavelength voltage (Vπ) and null point voltage (Vnull) are investigated under long-term high-temperature aging tests. The time correlations with the change in Vπ and Vnull are different from each other. By using a statistical treatment of the Weibull distribution, ...Show More
Compact InP MZ modulator for high-speed transmission systems
16th Opto-Electronics and Communications Conference
Year: 2011 | Conference Paper |
Integration of semiconductor Mach-Zehnder modulator with tunable-wavelength laser diode
CLEO: 2011 - Laser Science to Photonic Applications
Year: 2011 | Conference Paper |
Cited by: Papers (1)
A semiconductor Mach-Zehnder modulator was integrated with a tunable-wavelength laser by using monolithic and hybrid integration techniques. Tunable-wavelength 40-Gbit/s DPSK modulation and 10-Gbit/s NRZ modulation were successfully demonstrated for hybrid and monolithic devices, respectively.Show More
Demonstration of 50 Gbit/s 16QAM signal generation by novel 16QAM generation method using a dual-drive InP Mach-Zehnder modulator
Eiichi Yamada;Yasuo Shibata;Kei Watanabe;Takako Yasui;Akira Ohki;Hiroyasu Mawatari;Shigeru Kanazawa;Ryuzo Iga;Hiroyuki Ishii
2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference
Year: 2011 | Conference Paper |
Cited by: Patents (1)
Photonic devices for 100Gbps and beyond
Asia Communications and Photonics Conference and Exhibition
Year: 2010 | Conference Paper |
In this paper a tunable DFB laser array (TLA) with a long-cavity (1500 μm) DFB structure. The laser covers a 40-nm (4.8-THz) tuning range in the L-band with a fiber output power of 20 mW and a high SMSR of >;50 dB. Narrow linewidth operation below 160 kHz was obtained over the entire tuning range. An InP DQPSK modulator with low electrical and optical propagation losses is also developed. Moreover...Show More
Directly frequency modulated DFB laser integrated with EA modulator for extended transmission reach
K. Hasebe;S. Matsuo;H. Sanjoh;A. Ohki;T. Kakitsuka;Y. Shibata
36th European Conference and Exhibition on Optical Communication
Year: 2010 | Conference Paper |
Cited by: Papers (13)
We have successfully demonstrated the 180-km transmission of 10-Gbit/s NRZ signal using a dual-modulated EA-DFB laser. Directly frequency modulated DFB laser having semi-insulated semiconductor buried heterostructure effectively suppresses thermal frequency modulation, resulting in error-free transmission with PRBS of 231-1.Show More
Full $C$ -Band 10-Gb/s 40-km SMF Transmission of InGaAlAs Electroabsorption Modulator
Wataru Kobayashi;Naoki Fujiwara;Takayuki Yamanaka;Takashi Tadokoro;Takeshi Fujisawa;Yasuo Shibata;Mitsuteru Ishikawa;Masakazu Arai;Ken Tsuzuki;Fumiyoshi Kano
Journal of Lightwave Technology
Cited by: Papers (5)
This paper describes the 10-Gb/s, full C-band (1530 to 1565 nm) operation of 1.55-m electroabsorption modulators (EAMs) designed to eliminate the cost of a back up light source for a 10-Gb/s dense wavelength division multiplexing (DWDM) system. We employ InGaAlAs as the material for the EAM multiple-quantum well (MQW), and design it to achieve a sufficient extinction ratio and a low chirp () param...Show More
A monolithic wavelength-routing switch using double-ring-resonator-coupled tunable lasers with highly reflective mirrors
T. Segawa;S. Matsuo;T. Kakitsuka;Y. Shibata;T. Sato;R. Takahashi
2010 22nd International Conference on Indium Phosphide and Related Materials (IPRM)
Year: 2010 | Conference Paper |
Cited by: Papers (1)
We report a monolithically integrated 8×8 wavelength-routing switch with semiconductor-optical-amplifier-based wavelength converters and double-ring-resonator-coupled tunable lasers incorporated with highly reflective cavity mirrors. The dry-etched mirror coated with Au enables flexibility in device layout. It allows highly reflective mirrors in a chip and antireflective coating on both the input ...Show More
Full C-band 40-Gbit/s DPSK tunable transmitter module developed by hybrid integration of tunable laser and InP n-p-i-n Mach-Zehnder modulator
Eiichi Yamada;Akira Ohki;Nobuhiro Kikuchi;Yasuo Shibata;Takako Yasui;Kei Watanabe;Hiroyuki Ishii;Ryuzo Iga;Hiromi Oohashi
2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference
Year: 2010 | Conference Paper |
Cited by: Papers (6)
Dynamic operation of a monolithic wavelength-routing switch using double-ring-resonator-coupled tunable laser diodes
T. Segawa;S. Matsuo;T. Kakitsuka;Y. Shibata;T. Sato;Y. Kawaguchi;Y. Kondo;R. Takahashi
2009 International Conference on Photonics in Switching
Year: 2009 | Conference Paper |
Cited by: Papers (3)
We demonstrate an all-optical wavelength-routing switch monolithically integrated with four wavelength converters and an 8times8 arrayed-waveguide-grating (AWG) filter. In the switch, double-ring-resonator-coupled tunable laser diodes allow rapid and stable switching between output ports (~5 ns) and optical gates based on a parallel amplifier structure prevent the input optical signal from being r...Show More
10-Gb/s, 80-km SMF Transmission From 0 to 80 $^{\circ}$C by Using L-Band InGaAlAs-MQW Electroabsorption Modulated Laser With Twin Waveguide Structure
Wataru Kobayashi;Ken Tsuzuki;Yasuo Shibata;Takayuki Yamanaka;Yasuhiro Kondo;Fumiyoshi Kano
Journal of Lightwave Technology
Cited by: Papers (3)
A 10-Gbit/s, 1.58-mu m, InGaAlAs electroabsorption modulator (EAM) integrated distributed-feedback (DFB) laser (EML) with a twin waveguide (TWG) structure is operated experimentally over a wide temperature range of 0 to 80degC. We introduce an InGaAlAs multi-quantum well (MQW) system for both LD and EAM MQWs, because this material has temperature-tolerant characteristics. These layers are grown us...Show More
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