Abstract
Polarization-insensitive 640 Gbit/s demultiplexing for OTDM data signals
is demonstrated using a 100 m polarization-maintaining highly non-linear
fibre. The scheme is based on four wave mixing (FWM) in a
polarization-maintaining fibre loop (PMFL) with bidirectional operation.
Less than 0.2 dB polarization dependence is obtained. The FWM efficiency is
about ${-}6$ dB if the passive loss of the PMFL is not included. The flatness
characteristic of the FWM efficiencies allows for the OTDM demultiplexing of
a high speed signal with a bandwidth of 1.2 THz. Error free performance with
low penalty for the demultiplexed 10 Gbit/s signal is achieved for the
polarization scrambled 640 Gbit/s data signal. BER measurements and
eye-diagrams show that the demultiplexed 10 Gbit/s signals with and without
polarization scrambling have almost identical performance.
© 2010 IEEE
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