Modulation format identification (MFI) is compulsory to reconfigure the digital signal processing (DSP) flow at the receiver-side (Rx) under the condition of modulation format switching. Here, we demonstrate a blind and fast MFI enabled by the digital frequency-offset (FO) loading technique for hitless coherent transceiver. Then, the operation of proposed method is extended to probabilistic shaping quadrature amplitude modulation (PS-QAM) formats. The proposed MFI scheme with compatible operation of both traditional QAM and PS-QAM formats is ideally desired for future agile optical network.
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