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27 February 2020 56 Gbaud PAM4 real time optical Datacom link
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We present a Forward Error Correction (FEC) - assisted, 56 Gbaud PAM4 optical link having error free performance with adequate link margin of better than 6 dB. The link was formed by driving a 1550 nm Externally Modulated Laser (EML) with a commercial PAM4 transceiver chip. The optical signal was transmitted over various link lengths of dispersion compensated fiber, fed to a low-noise Linear InGaAs Photoreceiver having Automatic Gain Control (AGC), and routed back to the PAM4 transceiver chip with ADC & DSP capability. Real time bit error rate measurements demonstrate the advantage of employing linear receivers having AGC.
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John Pertessis, Shubhashish Datta, and Abhay Joshi "56 Gbaud PAM4 real time optical Datacom link", Proc. SPIE 11308, Metro and Data Center Optical Networks and Short-Reach Links III, 113080B (27 February 2020);

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