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학술지 Impact of Quadrature Imbalance in Optical Coherent QPSK Receiver
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저자
장순혁, 정환석, 김광준
발행일
200906
출처
IEEE Photonics Technology Letters, v.21 no.11, pp.709-711
ISSN
1041-1135
출판사
IEEE
DOI
https://dx.doi.org/10.1109/LPT.2009.2016759
협약과제
09MH1200, 100Gbps급 이더넷 및 광전송기술개발, 김광준
초록
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.
키워드
Optical fiber communication, Optical fiber devices
KSP 제안 키워드
All-fiber, Bit-error-rate(BER), Correction algorithm, Correction method, Fiber optical, Gram-Schmidt orthogonalization, OSNR penalty, Optical QPSK, Optical coherent, Optical fiber communications, Optical fiber devices