Field demonstrations of coherent WDM via a diode-pumped erbium-doped fibre amplifier repeater

Author

Brain, M.C. ; Creaner, M.J. ; Steele, R.C. ; Spirit, D. ; Walker, G.R. ; Walker, N.G. ; Mellis, J. ; Al-Chalabi, S. ; Hale, W.B. ; Sturgess, I.C.C. ; Rutherford, M. ; Trivett, D.

Author_Institution

British Telecom Res. Labs., Ipswich, UK

fYear

1990

fDate

33051

Firstpage

42552

Lastpage

42556

Abstract

The authors report the results of field demonstrations of DPSK and FSK coherent transmission of 2 WDM channels via a single optical repeater. They indicate the scope for expansion to longer cascades spanning hundreds of kilometres between digital regenerators, or to many more wavelength channels. The optical repeater employed comprised two erbium-doped fibre amplifiers in cascade. Both were optically-pumped by diode lasers emitting at 1.48 μm wavelength: the first was co-pumped (producing low noise) whilst the second was counter-pumped (giving a high saturated output power). An optical isolator separated the two amplifiers, to suppress laser oscillations induced by reflections from the two pump sources. The demonstration route comprised two links between nodes in the BT network located at Edinburgh, Galashiels, and Newcastle. The link lengths were 70 and 130 km, with losses of 21.5 and 43.5 dB, giving a total system length of 200 km and a loss of 65 dB

Keywords

digital communication systems; frequency division multiplexing; frequency shift keying; optical fibres; optical links; optical pumping; phase shift keying; repeaters; solid lasers; 1.48 micron; 130 km; 200 km; 21.5 to 65 dB; 70 km; DPSK; Er doped optical fibre; FSK; coherent WDM; diode lasers; diode pumped fibre amplifier; field demonstrations; optical repeater;

fLanguage

English

Publisher

iet

Conference_Titel

Coherent Optical Communications, IEE Colloquium on

Conference_Location

London

Type

conf

Filename

190494