Title :
Direct demodulation of 140 Mb/s FSK signals in an injection-locked multiquantum-well DFB laser
Author :
Nakajima, H. ; Derouiche, R.
Author_Institution :
France Telecom, Bagneux, France
Abstract :
The authors report the transmission of frequency shift keying (FSK) signals using an injection-locked multiquantum-well distributed-feedback (DFB) laser that acts simultaneously as an optical frequency discriminator and a photodetector. 140 Mb/s FSK signals are directly demodulated by detecting changes in the forward voltage of an injection-locked GaInAs/GaInAsP/InP MQW DFB laser. A sensitivity of -25.9 dBm was measured at a bit-error-rate of 10/sup -9/. Bias-current-dependent FM demodulation efficiency is also reported together with the optical-power-dependent linewidth enhancement factor.<>
Keywords :
III-V semiconductors; distributed feedback lasers; frequency shift keying; gallium arsenide; indium compounds; infrared detectors; optical communication equipment; optical modulation; photodetectors; semiconductor junction lasers; 140 Mbit/s; FSK signals; GaInAs-GaInAsP-InP; GaInAs/GaInAsP/InP MQW DFB laser; III-V semiconductor; bias current dependent FM demodulation efficiency; bit-error-rate; direct demodulation; distributed feedback laser; frequency shift keying; injection-locked multiquantum-well DFB laser; optical frequency discriminator; optical-power-dependent linewidth enhancement factor; photodetector; sensitivity; Bandwidth; Demodulation; Frequency modulation; Frequency shift keying; Laser transitions; Optical feedback; Optical interferometry; Optical receivers; Optical saturation; Optical sensors;
Journal_Title :
Photonics Technology Letters, IEEE
