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Mitigation of XPM Penalty in 10-Gb/s OOK/DBPSK Mixed Modulation Format 50-GHz-Spaced WDM Transmission by Conversion of OOK to BPSK Using an SOA

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2 Author(s)
W. Astar ; Lab. for Phys. Sci. (LPS), College Park, MD ; G. M. Carter

Copropagation of return-to-zero differential binary phase-shift keying (RZ-DBPSK) with RZ on-off keying (RZ-OOK) in wavelength-division-multiplexed (WDM) transmission has been found to be detrimental to RZ-DBPSK due to cross-phase modulation (XPM) degradations induced by pattern-dependent RZ-OOK. A method is proposed at the optical cross-connect (not at the transmitter end) to alleviate this degradation, in which the impairing RZ-OOK channel is converted to RZ binary phase-shift keying (RZ-BPSK) in a semiconductor optical amplifier (SOA) prior to 50-GHz-spaced WDM transmission. The data format conversion completely compensates for the XPM degradation, while resulting in an optical signal-to-noise ratio transmission penalty of <2 dB for converted RZ-BPSK relative to RZ-OOK. Moreover, the wavelength conversion may be used to address contention resolution at the cross-connects.

Published in:

IEEE Photonics Technology Letters  (Volume:20 ,  Issue: 20 )