Adaptive frequency-domain equalization in digital coherent optical receivers | Zendy

Md. Saifuddin Faruk | Zendy; K. Kikuchi | Zendy

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Adaptive frequency-domain equalization in digital coherent optical receivers

Author(s) -

Md. Saifuddin Faruk,

K. Kikuchi

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.012789

Subject(s) - adaptive equalizer , computer science , phase shift keying , equalization (audio) , electronic engineering , polarization division multiplexing , quadrature amplitude modulation , transmission (telecommunications) , multiplexing , symbol rate , bit error rate , digital signal processing , signal processing , algorithm , decoding methods , telecommunications , engineering , computer hardware

We propose a novel frequency-domain adaptive equalizer in digital coherent optical receivers, which can reduce computational complexity of the conventional time-domain adaptive equalizer based on finite-impulse-response (FIR) filters. The proposed equalizer can operate on the input sequence sampled by free-running analog-to-digital converters (ADCs) at the rate of two samples per symbol; therefore, the arbitrary initial sampling phase of ADCs can be adjusted so that the best symbol-spaced sequence is produced. The equalizer can also be configured in the butterfly structure, which enables demultiplexing of polarization tributaries apart from equalization of linear transmission impairments. The performance of the proposed equalization scheme is verified by 40-Gbits/s dual-polarization quadrature phase-shift keying (QPSK) transmission experiments.

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