Title :
Tunable DFB Laser Array Integrated With Mach–Zehnder Modulators for 44.6 Gb/s DQPSK Transmitter
Author :
Sasahata, Y. ; Saito, Takashi ; Takiguchi, Tetsuya ; Takagi, Kazuyoshi ; Matsumoto, Kaname ; Nagira, T. ; Sakuma, H. ; Suzuki, Daisuke ; Makita, R. ; Takabayashi, M. ; Gotoda, M. ; Ishimura, E.
Author_Institution :
High Freq. & Opt. Device Works, Mitsubishi Electr. Corp., Itami, Japan
Abstract :
A tunable distributed feedback (DFB) laser array integrated with Mach-Zehnder modulators (TLA-MZMs) for a 44.6 Gb/s differential quadrature phase shift keying (DQPSK) transmitter has been developed. The TLA-MZMs covers 98 wavelength channels with the 50 GHz ITU-T grid in the L-band. The side-mode suppression ratio for all channels was over 47 dB. DC extinction ratios over 25 dB were achieved for the MZMs. Our design achieves both the low modulation voltage (2 Vπ) less than 3 Vpp and the low-excess loss less than 1 dB. 44.6 Gb/s DQPSK modulation with a low driving voltage of 3 V was successfully demonstrated.
Keywords :
Mach-Zehnder interferometers; distributed feedback lasers; quadrature phase shift keying; radio transmitters; DFB laser array; DQPSK modulation; DQPSK transmitter; ITU-T grid; L-band; Mach-Zehnder modulators; bit rate 44.6 Gbit/s; differential quadrature phase shift keying; frequency 50 GHz; modulation voltage; side-mode suppression ratio; tunable distributed feedback laser array; voltage 3 V; wavelength channels; Arrays; Distributed feedback devices; Optical transmitters; Optical waveguides; Phase modulation; Semiconductor optical amplifiers; Distributed feedback (DFB) lasers; optical fiber communication; optical modulation; optical transmitters; semiconductor lasers;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2013.2241737
