Title :
Coherent optical receiver for 680 Mbit/s using phase diversity
Author :
Davis, A.W. ; Wright, S. ; Pettitt, M.J. ; King, J.P. ; Richards, K.
Author_Institution :
Standard Telecommunication Laboratories Limited, Harlow, UK
Abstract :
A coherent optical receiver using a multiport optical coupler to provide phase diversity is described. By this means, only homodyne bandwidth is required in the signal processing, but with tolerances on the frequency tracking typical of heterodyne systems. Measured sensitivities with limited local-oscillator power are ¿47.5 dBm at 320 Mbit/s and ¿42 dBm at 680 Mbit/s. The results at the higher bit rate are strongly influenced by limited receiver module bandwidth.
Keywords :
digital communication systems; optical communication equipment; baud rate 680 Mbit/s; coherent optical receiver; frequency tracking; homodyne bandwidth; limited local-oscillator power; multiport optical coupler; phase diversity; receiver module bandwidth; signal processing;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19860007
