Performance limitations of amplified coherent optical transmission systems due to interfering echoes

Author

Walker, G.R. ; Steele, R.C. ; Walker, N.G.

Author_Institution

British Telecom Res. Lab., Ipswich, UK

Volume

2

Issue

5

fYear

1990

fDate

5/1/1990 12:00:00 AM

Firstpage

377

Lastpage

379

Abstract

Interfering echoes produced in semiconductor amplifier cascades are known to cause bit error rate (BER) degradations in optical transmission systems. An experimental investigation of the effect of interfering echoes in a coherent differential phase-shift keying (DPSK) system is described and results in good agreement with theoretical predictions are reported. It is concluded that interfering echoes limit the minimum allowable inter-amplifier attenuation, which in turn severely limits the number of semiconductor laser amplifiers that can be cascaded without optical isolation.<>

Keywords

echo; light coherence; light interference; optical links; optical losses; optical modulation; phase shift keying; semiconductor junction lasers; amplified coherent optical transmission systems; bit error rate; cascaded; coherent differential phase-shift keying; degradations; interfering echoes; minimum allowable inter-amplifier attenuation; semiconductor amplifier cascades; semiconductor laser amplifiers; Bit error rate; Degradation; Differential phase shift keying; Differential quadrature phase shift keying; Laser theory; Optical attenuators; Quantum cascade lasers; Semiconductor lasers; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.54711

Filename

54711