Title :
Photonic devices for 100Gbps and beyond
Author :
Oohashi, Hiromi ; Ishii, Hiroyuki ; Shibata, Yasuo
Author_Institution :
NTT Photonics Labs., NTT Corp., Atsugi, Japan
Abstract :
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, the modulator exhibits a 6-dB electrical bandwidth of more than 41 GHz. The half-wavelength dc voltage is 2.8 V. We successfully demonstrated DQPSK modulation at 80 Gb/s with a driving voltage of 3 V in a push-pull configuration. We believe these devices will be employed as light sources for transmission systems with a higher order multi-level format.
Keywords :
Mach-Zehnder interferometers; differential phase shift keying; distributed feedback lasers; electro-optical modulation; laser cavity resonators; laser tuning; optical communication equipment; optical fibre losses; optical modulation; quadrature phase shift keying; semiconductor laser arrays; DQPSK modulation; DQPSK modulator; SMSR; bit rate 100 Gbit/s; bit rate 80 Gbit/s; electrical bandwidth; frequency 160 kHz; frequency 41 GHz; half-wavelength dc voltage; higher order multilevel format; light source; low electrical propagation loss; narrow linewidth operation; optical propagation loss; photonic device; power 20 mW; push-pull configuration; tunable DFB laser array; voltage 2.8 V; voltage 3 V; Arrays; Indium phosphide; Laser modes; Laser tuning; Optical modulation; Phase modulation;
Conference_Titel :
Communications and Photonics Conference and Exhibition (ACP), 2010 Asia
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-7111-9
DOI :
10.1109/ACP.2010.5682706
