NDLI: Optical coherent burst-mode receivers with delayed channel equalisation feedback from parallel and pipelined design

Content Provider	IET Digital Library
Author	Xu, Bo Liu, Xinyu Wu, Chenyu Qiu, Kun
Abstract	A digital optical coherent burst-mode receiver (BMR) with 112-Gb/s polarisation-division multiplexing-quaternary phase-shift keying (QPSK) modulation is proposed with parallel digital signal processing and pipelined design. The convergence rate property of the digital channel equaliser with non-negligible computational delay is studied extensively using simulations. Owing to the interaction between the channel equalisation and frequency offset estimation (FOE), a novel equaliser adaptation method using the latest available equaliser output and the latest available FOE result is proposed for a faster convergence than the conventional method. Simulation results reveal that the computational delay have a great impact on the convergence rate. A smaller step size for tap coefficient updating with slower convergence rate should be used to avoid divergence. Compared with the FOE module, the computational delay from the channel equaliser has the dominant effect on the convergence. The design of the equaliser with short computational delay is the key for a fast convergence rate. The parallel and pipelined digital optical coherent BMR after successful initialisation has negligible error rate performance loss when compared with the ideal serial signal processing within a wide frequency offset range.
Starting Page	975
Ending Page	981
Page Count	7
ISSN	17518628
Volume Number	9
e-ISSN	17518636
Issue Number	Issue 7, May (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/9/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2014.0735
Journal	IET Communications
Publisher Date	2015-03-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bit Rate 112 Gbit/s BMR Channel Estimation Communication Channel Equalisation And Identification Convergence Rate Property Delayed Channel Equalisation Feedback Digital Channel Equaliser Digital Optical Coherent Burst-mode Receiver Equaliser Equaliser Adaptation Method Error Rate Performance FOE Frequency Estimation Frequency Offset Estimation Light Polarisation Modulation And Coding Method Multiplexing And Switching in Optical Communication Nonnegligible Computational Delay Optical Communication Equipment Optical Modulation Optical Receiver Parallel Digital Signal Processing Pipelined Design Polarisation-division Multiplexing-QPSK Modulation Quadrature Phase Shift Keying Signal Processing Signal Processing And Detection Statistics
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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