VLSI Implementations of Carrier Phase Recovery Algorithms for M-QAM Fiber-Optic Systems
Journal article, 2020

We present circuit implementations of blind phase search (BPS) carrier phase recovery (CPR) for M-QAM coherent optical receivers and highlight some BPS algorithm modifications necessary to obtain efficient VLSI circuits. In addition, we show how three key design parameters (input word length, number of test phases, and type and size of averaging window) affect the resulting implementation. To study design tradeoffs, we develop BPS CPR circuit netlists for a 32-GBaud system, using a 22-nm CMOS process technology: Our implementations reach energy efficiencies of around 1 pJ/bit for 16QAM up to 3 pJ/bit for 256QAM, at an SNR penalty of approximately 0.25 dB at a BER of 10^(−2). Furthermore, we present a circuit implementation of pilot-symbol-aided CPR, reaching 0.38 pJ/bit and 0.34 pJ/bit for 16QAM and 256QAM, respectively, at a slightly higher SNR penalty. The two CPR methods are also evaluated in terms of silicon area and scaling to higher-order modulation formats.


Erik Börjeson

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

Christoffer Fougstedt

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

Per Larsson-Edefors

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

Journal of Lightwave Technology

0733-8724 (ISSN)

Vol. 38 14 3616-3623 9007736

Energy-efficient optical fibre communication

Knut and Alice Wallenberg Foundation (KAW2013.0021), 2014-07-01 -- 2019-06-30.

Energieffektiv och höghastighets-transmission i optisk fiber kommunikation

VINNOVA (2017-05228), 2018-01-01 -- 2019-12-31.

Areas of Advance

Information and Communication Technology

Driving Forces

Sustainable development

Subject Categories

Communication Systems

Embedded Systems

Signal Processing



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4/5/2022 6