Title :
Analysis of laser diodes as transmitter and preamplifiers in time compression multiplexing systems
Author_Institution :
NTT Corp., Kanagawa, Japan
fDate :
3/1/1992 12:00:00 AM
Abstract :
It is proposed that a laser diode used as a transmitter in the transmission mode be used as a low bias current preamplifier in the receiving mode for time compression multiplexing transmission. By adopting the low bias current approach, the preamplifier is wavelength and polarization independent. The maximum bias current is determined to be about 0.5 Ith (Ith=threshold current) by experiments. A transmission experiment at 3.5 Mb/s reveals that about 4 dB of improvement in receiver sensitivity can be obtained by using a laser preamplifier at I=0.54 Ith when compared to an unbiased laser. The receiver sensitivity of the proposed configuration (laser amplifier at low bias current and photodiode) is estimated by considering the laser preamplifier noise and circuit noise. The laser preamplifier noise is calculated by treating the laser as a traveling wave amplifier with highly reflecting facets
Keywords :
electron device noise; multiplexing; optical communication equipment; photodiodes; preamplifiers; receivers; semiconductor junction lasers; sensitivity; transmitters; 3.5 Mbit/s; TCM transmission; circuit noise; highly reflecting facets; laser diodes; laser preamplifier noise; low bias current approach; low bias current preamplifier; maximum bias current; photodiode; polarization independent; receiver sensitivity; receiving mode; threshold current; time compression multiplexing systems; transmission mode; transmitter; traveling wave amplifier; wavelength independent; Diode lasers; Laser modes; Laser noise; Optical attenuators; Optical noise; Optical receivers; Optical sensors; Optical transmitters; Preamplifiers; Transceivers;
Journal_Title :
Lightwave Technology, Journal of
