112 Gbit/s PDM-CSRZ-DQPSK field trial over 1730 km deployed DWDM-link

Браун,; Fritzsche,; Ehrhardt,; Schurer,; Wagner, Stefan; Schneiders,; Vorbeck,; Xie, Weibo; Zhao, Xiujian; WAN, WAN; Liu, Ming; Zhou, Quan; Hostalka,

doi:10.1109/acp.2010.5682524

Cited by 2 publications

(1 citation statement)

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“…With the introduction of colorless CMD, new ROADM-based architectures described as Colorless-Directionless-Contentionless (CDC) Mux/Demux are heavily deployed in nowadays' mesh networks [41]. The latter may have more than hundreds of light-paths [42] and deploy multi-degrees ROADMs, up to 8 degrees using WSSs with 43 ports as presented in [43,44], per site where any tunable Tx can be connected to any colorless CMD port. Having said that, pre-setting the correct pre-equalization TF or programming FIR filter taps properly takes an enormous effort and it's prone to mistakes.…”

Section: Comparison Of Contribution To Other Published Methodsmentioning

confidence: 99%

Adaptive Pre/Post-Compensation of Cascade Filters in Coherent Optical Transponders

Abdo

D’Amours

2020

Future Internet

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We propose an adaptive joint pre- and post-compensation to correct the filtering effects caused by cascading reconfigurable optical add drop multiplexers (ROADMs). The improvement is achieved without using additional hardware (HW) on the link or within the signal processor in the transponders. Using Monte Carlo simulations, the gradient-descent based method shows an improvement of 0.6 dB and 1.1 dB in the required optical signal-to-noise ratio (R-OSNR) at the threshold pre-decoder bit error rate (BER) of 0.02 versus pre-compensation only in the linear and nonlinear operating region of fiber respectively. We experimentally verified the method with lab measurements in the presence of heavy filtering and optical impairments. We observed a gain up to ~0.4 dB compared to typically used pre-compensation only. Additionally, other tangible system benefits of our method are listed and discussed.

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Section: Comparison Of Contribution To Other Published Methodsmentioning

confidence: 99%