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Low detection penalty in an optical DPSK heterodyne system using a saturated optical amplifier as phase modulator

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3 Author(s)
Hui Bon Hoa, D. ; CNET, Lannion, France ; Le Ligne, M. ; O'Hare, A.T.

A model established from the rate equations of a near traveling-wave optical amplifier (NTWOA) used as a phase modulator shows that the modulation rate is limited by the carrier lifetime to 500 Mb/s and that the worst-case detection penalty is about 0.7 dB. It is then experimentally demonstrated that close control of the injected light polarization can reduce the detection penalty in a DPSK (differential phase-shift keying) heterodyne system, using an NTWOA phase modulator instead of an LiNbO3 modulator, to 0.6 dB. This device and a balance receiver have allowed the implementation of 282-Mb/s DPSK link operating at 1.522 μm over 242 km of fiber with a 3-dB margin

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Lightwave Technology, Journal of  (Volume:9 ,  Issue: 2 )