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Digital coherent reception is an attractive candidate for increasing the channel capacity without expanding the bandwidth needed. The receiver DSP circuit must be able to compensate for the IQ-phase/power mismatch with low computation power requirements. In this paper, we propose a novel DSP circuit suitable for short-reach transmission systems including intra-datacenter networks. The proposed DSP circuit offers polarization-mode demultiplexing, compensation for IQ-phase/power mismatch, and estimation of carrier phase and frequency offset. The proposed DSP circuit consists of three-stage one-tap FIR filters; therefore, complicated calculations are not required. Its good demodulation performance is confirmed by simulations.
Takuma Kuno,Yojiro Mori, andHiroshi Hasegawa
"Evaluation of low-complexity digital coherent receivers for short-reach transmission systems", Proc. SPIE 11712, Metro and Data Center Optical Networks and Short-Reach Links IV, 117120C (5 March 2021); https://doi.org/10.1117/12.2577542
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Takuma Kuno, Yojiro Mori, Hiroshi Hasegawa, "Evaluation of low-complexity digital coherent receivers for short-reach transmission systems," Proc. SPIE 11712, Metro and Data Center Optical Networks and Short-Reach Links IV, 117120C (5 March 2021); https://doi.org/10.1117/12.2577542