Research and development within the Plessey Company in the area of coherent optical communications is aimed at both free space and fibre based applications. Fibre based system design and experimentation covers the areas of high sensitivity single channel systems and multichannel systems, the latter being addressed in the main for the subscriber access within future broadband telecommunications networks. In this context a major system demonstration is being constructed in collaboration with partners within Europe as part of a RACE project. Modulation techniques of FSK, CPFSK, and DPSK have been addressed. Supporting R&D in devices and components includes: narrow linewidth and tunable laser sources of the DFB and external cavity types, integrated optic devices for polarisation control, polarisation diversity, and amplitude and phase modulation using lithium niobate, and broadband dual detector receiver front-ends.

Date Published: 5 February 1990
PDF: 8 pages
Proc. SPIE 1175, Coherent Lightwave Communications: Fourth in a Series, (5 February 1990); doi: 10.1117/12.963282

Published in SPIE Proceedings Vol. 1175:
Coherent Lightwave Communications: Fourth in a Series
Roger C. Steele; Harish R. Sunak, Editor(s)