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6 September 2019 28 Gbaud PAM4 real time optical datacom link up to 40 km
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We present a Forward Error Correction (FEC) assisted optical link that operated at 28 Gbaud (56 Gbps) error-free over link lengths ranging from 10 m to 40 km with Pulse Amplitude Modulation 4-level (PAM4) signals. The links operated with link margins greater than 10 dB due to the wide optical dynamic range performance which will be evident from the sensitivity plots presented. The link was implemented with a commercial PAM4 transceiver chip with built-in FEC driving a Low Noise Amplifier (LNA) which in turn drove a 1550 nm Externally Modulated Laser (EML). The link could have been implemented with a 1310 nm laser and produced comparable results. The optical signal was transmitted over dispersion compensated fiber, fed to a low-noise 28 GHz Linear InGaAs photoreceiver having variable gain, and routed back to the PAM4 transceiver chip. Real time bit error rate measurements demonstrate the advantage of employing linear receivers having Automatic Gain Control (AGC).
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John Pertessis, Shubhashish Datta, and Abhay Joshi "28 Gbaud PAM4 real time optical datacom link up to 40 km", Proc. SPIE 11136, Optics and Photonics for Information Processing XIII, 111360T (6 September 2019);


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