Penalties from in-band crosstalk for advanced optical modulation formats

We quantify, through simulations and experiments at 21.4 GBaud, the effect of in-band crosstalk on several advanced optical modulation formats, showing a 1-dB penalty at a bit-error ratio of 1×10<sup>−3</sup> from a crosstalk of −18 dB, −24 dB, and −32 dB for QPSK, 16-QAM, and 64-QAM, respectively.

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