50 ch × 250 Gbit/s 32-QAM transmission over a fully integrated 7-core multicore link

Abstract

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108 Tb/s Transmission Over 120 km of 7-Core Multicore Fiber with Integrated Cladding Pumped Multicore Amplifiers

“…Advanced modulation techniques as e.g. time-domain hybrid QAM (TDHQ) [3][4][5] , frequency-domain hybrid modulation 6 , constellation shaping and multi-dimensional modulation formats provide much finer granularity in required SNR and achievable data-rates, keeping symbol rate and code rate fixed. By employing advanced modulation formats, throughput can be precisely maximized and cost per bit can be further reduced.…”

“…Fiber fanin/fan-out couplers based on free-space optics are used to integrate the multi-core link in the recirculating loop. The pump currents for both amplifiers are optimized by considering best performance for middle core as well as for two outer cores and taking the average value 3 . The loop setup is so configured that the optical signal circulates twice through the core under test emulating 120 km transmission link.…”