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We investigate the crosstalk tolerance of 112 Gb/s PDM-QPSK channels for various temporal or spectral configurations of the detected and the crosstalk signals. We also illustrate usual bandwidth characterizations are not appropriate for coherent detection.
We show that 43 Gb/s DPSK channels aligned on the 50 GHz ITU grid remain tolerant to crosstalk thanks to the narrow optical filtering functions of the traversed transparent nodes and their different routing states.
We show that the tolerance to in-band crosstalk due to a slight misalignment of the filtering function can be relaxed. Such impairment may occur in case of WSS requiring accurate alignments of several optical elements
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