Rate‐Adaptable Optical Transmission and Elastic Optical Networks

Layec, Patricia; Morea, Annalisa; Pointurier, Yvan; Antona, Jean‐Christophe

doi:10.1002/9781119078289.ch15

Cited by 5 publications

(1 citation statement)

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“…A rate-adaptive transceiver has the ability to adapt its bit rate to the current channel conditions in order to maximize the spectral efficiency [10]. Approaches used to enable transceiver flexibility include constellation shaping, time-domain hybrid modulation formats, and variable-rate FEC codes [11].…”

Section: Introductionmentioning

confidence: 99%

Variable-Rate VLSI Architecture for 400-Gb/s Hard-Decision Product Decoder

Jain

Fougstedt

Larsson-Edefors

2021

IEEE Trans. Circuits Syst. I

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Variable-rate transceivers, which adapt to the conditions, will be central to energy-efficient communication. However, fiber-optic communication systems with high bit-rate requirements make design of flexible transceivers challenging, since additional circuits needed to orchestrate the flexibility will increase area and degrade speed. We propose a variable-rate VLSI architecture of a forward error correction (FEC) decoder based on hard-decision product codes. Variable shortening of component codes provides a mechanism by which code rate can be varied, the number of iterations offers a knob to control the coding gain, while a key-equation solver module that can swap between error-locator polynomial coefficients provides a means to change error correction capability. Our evaluations based on 28nm netlists show that a variable-rate decoder implementation can offer a net coding gain (NCG) range of 9.96-10.38 dB at a post-FEC bit-error rate of 10 −15 . The decoder achieves throughputs in excess of 400 Gb/s, latencies below 53 ns, and energy efficiencies of 1.14 pJ/bit or less. While the area of the variable-rate decoder is 31% larger than a decoder with a fixed rate, the power dissipation is a mere 5% higher. The variable error correction capability feature increases the NCG range further, to above 10.5 dB, but at a significant area cost.

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Section: Introductionmentioning

confidence: 99%