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Effect of Mach-Zehnder modulator DC extinction ratio on residual chirp-induced dispersion in 10-Gb/s binary and AM-PSK duobinary lightwave systems

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2 Author(s)
Walklin, S. ; TRLabs, Edmonton, Alta., Canada ; Conradi, J.

It is shown through numerical simulation that residual frequency chirping in lithium niobate external modulators, which accompanies devices with a finite-optical extinction ratio, always degrades the performance of lightwave systems that use optical AM-PSK duobinary signaling. This is unlike binary systems which will exhibit either an improvement or degradation, depending on the polarity of residual chirp.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 10 )