The performance of subcarrier multiplexed coherent systems is compared theoretically using optical intensity and phase modulators. The results show that a subcarrier multiplexed coherent system with a symmetrical optical intensity modulator can offer a receiver sensitivity improvement as high as 9.1 dB over that with an optical phase modulator.
Published in:
Electronics Letters
(Volume:28
,
Issue:
2
)
Date of Publication: 16 Jan. 1992