Analysis of laser diodes as transmitter and preamplifiers in time compression multiplexing systems

Author

Kashima, Norio

Author_Institution

NTT Corp., Kanagawa, Japan

Volume

10

Issue

3

fYear

1992

fDate

3/1/1992 12:00:00 AM

Firstpage

323

Lastpage

329

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 I_th (I_th=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 I_th 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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.124494

Filename

124494