Abstract
A widely tunable burst mode digital coherent receiver is implemented
in a 112 Gb/s DP-QPSK WDM system. The receiver performance is validated in
a 24-channel WDM test-bed using a commercially available DS-DBR laser as the
local oscillator. It is demonstrated that the wavelength tunable laser can
switch to any one of the 24-channels in less than 130 ns, thus enabling the
dynamic reception of 5 µs optical bursts. The performance of the DS-DBR local oscillator
laser is commensurate with burst mode coherent reception when differential
decoding is employed and the parallel DSP implementation does not impair the
polarization and frequency tracking performance of a digital coherent receiver
under burst mode operation. The worst case reconfiguration time of the burst
mode receiver, which is a combination of the laser switching time and the
CMA convergence time, is less than 410 ns when switching from a single channel
to any other channel in the WDM grid. It is shown that the variation in reconfiguration
time is dependent on the convergence time of the CMA equalizer, which is adversely
affected by certain input states of polarization.
© 2012 IEEE
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