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Simple monitoring technique for synchronised phase remodulation using narrowband optical filtering

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3 Author(s)
Zhao, J. ; Dept. of Inf. Eng., Chinese Univ. of Hong Kong ; Ku, Y.C. ; Chen, L.K.

Synchronised phase remodulation (SPRM) to erase the original and write the new phase information simultaneously is a crucial signal processing technique in optical networks. A simple and polarisation-insensitive monitoring scheme for SPRM using a narrowband optical bandpass filter (OBPF) is demonstrated. Experiments show that, with the optimal central wavelength of the OBPF, -1.2 and 3.8 dB monitoring power dynamic ranges are obtained for non-return-to-zero differential phase shift keying and return-to-zero DPSK formats, respectively, thus achieving high monitoring sensitivity

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Electronics Letters  (Volume:43 ,  Issue: 6 )