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Format Conversion of Optical Multilevel Signals Using FWM-Based Optical Phase Erasure

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6 Author(s)
Guo-Wei Lu ; National Institute of Information and Communications Technology, Tokyo, Japan ; Ekawit Tipsuwannakul ; Tetsuya Miyazaki ; Carl Lundstrom
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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.

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Journal of Lightwave Technology  (Volume:29 ,  Issue: 16 )