Title :
Progress towards the field deployment of coherent optical fiber systems
Author :
Brain, M.C. ; Creaner, M.J. ; Steele, R.C. ; Walker, Nigel G. ; Walker, Graham R. ; Mellis, J. ; Al-Chalabi, S. ; Davidson, J. ; Rutherford, M. ; Sturgess, I.C.
Author_Institution :
British Telecom Res. Lab., Ipswich, UK
fDate :
3/1/1990 12:00:00 AM
Abstract :
A description is given of the first demonstration of a coherent optical transmission system deployed in an operational network. The miniaturized external cavity laser and the automated endless polarization control scheme which made it possible to mount this demonstration are described in detail, together with specific system results. A discussion is presented of the possible field deployment of other coherent system options, based on FSK modulation of DFB and DBR lasers, and polarisation diversity reception. The considerable potential afforded by coherent techniques for meeting future network requirements is highlighted. The demonstrated advantages of greater power budget and wavelength selectivity, combined with the use of optical amplifier multiwavelength repeaters, make coherent techniques particularly relevant to the growing demand for greater transmission capacity, transparency, and network flexibility. An increasingly urgent need for robust coherent optical technology can thus be anticipated, for wideband transmission and passive routing, for both telecommunications and computer networks of the near future
Keywords :
distributed Bragg reflector lasers; distributed feedback lasers; frequency shift keying; light coherence; optical fibres; optical modulation; DBR lasers; DFB lasers; FSK modulation; automated endless polarization control; coherent optical fiber systems; coherent optical transmission system; field deployment; miniaturized external cavity laser; multiwavelength repeaters; network flexibility; operational network; passive routing; polarisation diversity reception; power budget; transmission capacity; transparency; wavelength selectivity; wideband transmission; Automatic control; Control systems; Distributed Bragg reflectors; Fiber lasers; Frequency shift keying; Optical control; Optical fiber networks; Optical fiber polarization; Optical fibers; Stimulated emission;
Journal_Title :
Lightwave Technology, Journal of