Low-Resolution Digital Pre-Compensation Enabled by Digital Resolution Enhancer

Digital pre-compensation (DPC) is an indispensable block of state-of-the-art optical transceivers, and a key enabler for high-order modulation formats (HOMFs) transmission. A crucial component, which enables the transmission of the precompensated HOMFs, is the digital-to-analog-converter (DAC). Howe...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-03, Vol.37 (6), p.1543-1551
Main Authors: Yoffe, Yaron, Khanna, Ginni, Wohlgemuth, Eyal, de Man, Erik, Spinnler, Bernhard, Hanik, Norbert, Napoli, Antonio, Sadot, Dan
Format: Article
Language:English
Subjects:
Algorithms
coherent detection
Compensation
Computer simulation
Digital pre-compensation
digital signal procressing
Digital to analog conversion
Digital to analog converters
high-order modulation formats
Noise levels
Nonlinear distortion
Nonlinear optics
Optical transmitters
Power consumption
Power demand
quantization
Quantization (signal)
Receivers
resolution enhancement
Transceivers
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Summary:Digital pre-compensation (DPC) is an indispensable block of state-of-the-art optical transceivers, and a key enabler for high-order modulation formats (HOMFs) transmission. A crucial component, which enables the transmission of the precompensated HOMFs, is the digital-to-analog-converter (DAC). However, as data and symbol rates grow, the implementation of such devices becomes highly challenging in terms of performance, power consumption, and costs. In this paper, a digital-resolution-enhancer (DRE) algorithm is discussed, conjoined with high-end DPC methods. Simulation results demonstrate that the DRE reduces the effect of DAC quantization noise power by more than 8 dB for the considered cases of 400G with 64QAM. The proposed scheme is experimentally verified by transmitting a 4-bit DP-64QAM 400 Gbit/s signal in a WDM scenario over 95 km of single mode fiber.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2018.2885452