Abstract
To utilize fully the temporal coherence of laser light and to obtain high receiver sensitivity in digital coherent optical fiber communication, it is most desirable to encode the information onto the laser phase.1 However, such a phase shifted keying (PSK) scheme demands precise knowledge of the laser phase during demodulation and thus puts a stringent requirement on the tolerable level of phase noise for optimal system performance. This study attempts, first, to confirm the stringent phase noise, or linewidth requirement for a differential PSK (DPSK) system operated at 400 Mbit/s, and, second, to establish practical linewidth criteria based on experimental observations.
© 1988 Optical Society of America
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