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Journal Article Impact of Quadrature Imbalance in Optical Coherent QPSK Receiver
Cited 62 time in scopus Share share facebook twitter linkedin kakaostory
Authors
Sun Hyok Chang, Hwan Seok Chung, Kwang Joon Kim
Issue Date
2009-06
Citation
IEEE Photonics Technology Letters, v.21, no.11, pp.709-711
ISSN
1041-1135
Publisher
IEEE
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1109/LPT.2009.2016759
Abstract
In this letter, we present the impact of quadrature imbalance in an optical coherent quadrature phase-shift-keying (QPSK) receiver. Arbitrary conjugate misalignment was realized in all-fiber optical hybrid and two correction algorithms of quadrature imbalance, the ellipse correction method, and the Gram-Schmidt orthogonalization method, were independently applied. Bit-error-rate curves versus optical signal-to-noise ratio (OSNR) were measured for the 20-Gb/s optical QPSK signal. We show that OSNR penalty is reduced from ~6 to 1 dB at ~20째 conjugate misalignment with the help of correction algorithms. © 2009 IEEE.
KSP Keywords
All-fiber, Bit-error-rate(BER), Correction algorithm, Correction method, Fiber optical, Gram-Schmidt orthogonalization, OSNR penalty, Optical QPSK, Optical coherent, Optical hybrid, QPSK signal