Abstract
An optical format conversion scheme of multilevel phase-shift
keying (M-ary PSK) signals using the four-wave mixing based
optical phase erasure is discussed in this paper. The conversion
from differential quadrature phase-shift keying (DQPSK) to
differential phase shift keying at 10 and 160 Gbaud, and the
conversion from differential eight-ary phase-shift keying to DQPSK
at 40 Gbaud have been experimentally demonstrated. The proposed
scheme could be used as a phase erasure, in which a redundant
tributary of the M-ary PSK signal is removed, or as an
“updater” where the unwanted phase pattern is replaced with the new
pattern.
© 2011 IEEE
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