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Optical duobinary format from demodulation of DPSK using athermal delay interferometer

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4 Author(s)
Gnauck, A.H. ; Lucent Technol. Bell Labs., Holmdel, NJ ; Liu, X. ; Chandrasekhar, S. ; Wei, X.

We experimentally demonstrate the transformation of 42.7-Gb/s optical differential-phase-shift-keyed signals into high-quality duobinary signals by optical filtering in an athermal delay-interferometer (DI) filter. The resulting duobinary signals have good back-to-back performance and show high tolerance to chromatic dispersion and concatenated optical filtering. The repetitive passbands of the DI provide simultaneous transformation of multiple 42.7-Gb/s channels on a 50-GHz ITU grid. The passbands are wide enough not to affect 10.7-Gb/s channels, thereby also allowing hybrid-rate 50-GHz-spaced wavelength-division-multiplexed transmission using a single DI at the system input

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 4 )