Abstract
We have characterized the performance of a single-ended intradyne receiver
when multiple wavelength-division multiplexed (WDM) channels are incident.
Detection of a single 40 Gb/s dual-polarization QPSK channel is achieved
within a band of up to 17 WDM channels using a receiver with real-time
digital signal processing and without optical demultiplexing. Measurements
are presented of the performance in a back-to-back configuration as well as
after transmission over 400 km of standard single-mode fiber. The dependence
of the coincident channels' interference on various parameters, such as the
net chromatic dispersion and the orientation of the coincident channels'
polarization tributaries relative to the receiver polarizer, is explored. We
also investigate using a single interfering channel with its power
appropriately scaled to represent multiple interfering channels as an
alternative configuration for evaluating receiver performance. The
single-interferer approach has significant disadvantages including increased
polarization sensitivity and different scaling of the interference term
arising from the channel-channel beating compared to true multi-channel
interference.
© 2010 IEEE
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