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We successfully demonstrate the application of a recently proposed adaptive butterfly equalizer update algorithm, based on error signals evaluated in Stokes space, to the processing of data from a PM-16QAM Nyquist-WDM experiment with multi-span transmission over three fiber types.
We investigate the estimation of channel parameters from the receiver equalizer taps after CMA, in a 8,000km 30×120Gbit/s PM-QPSK transmission system experiment. We also show long-term results of joint measurements of BER, DGD and PDL.
Recently, coherent polarization-multiplexed quadrature-phase-shift keying has attracted considerable interest. Enabled by progress in ultrafast digital signal processing electronics, it can carry 4 bits per symbol and has been proposed for 100-Gb/s transmission at a reduced 25-GBaud line rate. Several different receiver structures are possible, whose performance, complexity, and design issues are...
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