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13 February 2016 Detection and alignment of XY skew for dual-polarization optical quadrature amplitude transmitter using reconfigurable interference
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Abstract
DP-QAM is one of the feasible paths towards 100Gbps, 400Gbps and 1Tbps optical communications systems. For DPQAM transmitter, the time mismatch between the XY tributary channels is known as the XY skew. Large uncompensated XY skew can significantly degrade the system performance. Sometimes, time-interleaved return-to-zero DP signal is preferred with lower nonlinear polarization scattering induced penalty. In this work, XY skew detection and alignment of dual-polarization optical quadrature amplitude transmitter using reconfigurable interference is experimentally demonstrated with >23-dB dynamic range. ~1.5-dB power change is achieved for 1-ps XY skew. Fast detecting scheme for arbitrary skew measurement is also experimentally verified. The scheme is compatible with different modulation formats, data sequences, and waveforms.
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Yang Yue, Bo Zhang, Qiang Wang, Rob Lofland, Jason O’Neil, and Jon Anderson "Detection and alignment of XY skew for dual-polarization optical quadrature amplitude transmitter using reconfigurable interference", Proc. SPIE 9774, Next-Generation Optical Communication: Components, Sub-Systems, and Systems V, 97740E (13 February 2016); https://doi.org/10.1117/12.2211826
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