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Polarization-insensitive frequency-shift-keying optical heterodyne receiver using discriminator demodulation

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2 Author(s)
Kavehrad, Mohsen ; AT&T Bell Lab., Holmdel, NJ, USA ; Glance, B.S.

A polarization-state-independent binary frequency-shift-keying optical heterodyne receiver, achieved by splitting the received signal between two orthogonal polarization axes and combining the signals after demodulation, is described. The authors consider various receiver configurations, using a discriminator with a limiter for applications in which received-signal-envelope fluctuations cannot be ignored, and without a limiter when the fluctuations are negligible. For applications that require the limiter, a diversity method or a variable-gain limiter that improves the performance of the limiter/discriminator receiver is proposed. Numerical results indicate that with diversity and a limiter/discriminator structure, polarization independence can be achieved with a system performance which is nearly that of an ideal receiver. Using a discriminator without a limiter, when there is no source of envelope fluctuations other than those due to Gaussian noise, the receiver performance degradation compared to the ideal baseline receiver is 0.5 dB

Published in:

Lightwave Technology, Journal of  (Volume:6 ,  Issue: 9 )

Date of Publication:

Sep 1988

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