An Experimental 50 Mb/s Fiber Optic PCM Repeater

Author

Runge, Peter K.

Author_Institution

Bell Labs., Holmdel, NJ, USA

Volume

24

Issue

4

fYear

1976

fDate

4/1/1976 12:00:00 AM

Firstpage

413

Lastpage

418

Abstract

An experimental repeater for amplification and regeneration of 50 Mb/s fiber-optical pulses has been built and tested. For the receiver either Si p-i-n or avalanche photodiodes are used in conjunction with a high impedance FET input amplifier. The high voltage for the avalanche photodiode is generated internally and controlled by the received signal. This AGC circuit is capable of compensating for temperature changes of the avalanche gain over the range of $-40 - +60\\deg$ C. The optical transmitter consists of either a GaAs light emitting diode or a GaA1As laser diode coupled to optical fibers and directly modulated by a current driver with 30 percent electrical efficiency. For 10^-9error rate, the required average optical signal power for a pseudorandom signal is p-i-n diode: -41.5 dBm; avalanche diode: -56.6 dBm. The optical output power into a fiber with 1 percent index difference is LED: -17 dBm; GaAlAs laser: 0 dBm. The repeater power requirement is about 2 W.

Keywords

Avalanche photodiodes; FET amplifiers; Gallium alloys/compounds, lasers; Light-emitting diodes (LED´s); Optical fiber communication; PCM communication; Photodiodes; Wire communication repeaters; p-i-n diodes; Avalanche photodiodes; Light emitting diodes; Optical fiber testing; Optical fibers; Optical modulation; Optical receivers; Optical transmitters; Phase change materials; Pulse amplifiers; Repeaters;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOM.1976.1093308

Filename

1093308