Ledentsov, N.N.LedentsovAgustin, M.M.AgustinChorchos, L.L.ChorchosKropp, J.R.J.R.KroppShchukin, V.A.V.A.ShchukinKalosha, V.P.V.P.KaloshaKöpp, M.M.KöppCaspar, C.C.CasparTurkiewicz, J.P.J.P.TurkiewiczLedentsov, N.N.N.N.Ledentsov2022-03-142022-03-142019https://publica.fraunhofer.de/handle/publica/40616510.1117/12.2509916Optical VCSEL-based links operating in on-off keying (OOK) modulation represent a robust energy-efficient solution for short-reach optical interconnects in datacenters. We report on the optical and electronic elements of such link and their integration into the transmitter (TR) and receiver (RX) assemblies. A single channel transceiver link capable of 40-56 Gbit/s OOK transmission over multimode fiber at record energy-efficiency of ~4.5 pJ/bit is demonstrated. VCSEL driver and receiver transimpedance amplifier (TIA) circuits capable of generating 80-100 Gbit/s error-free signals are characterized on a special test-board assembly. Real-time 56 Gbit/s transmission experiments of the complete link are done, resulting in bit-error ratios (BER) below standard Forward Error Correction (FEC) levels without equalization or signal processing.en621conference paper