상세정보
학술지
Impact of Quadrature Imbalance in Optical Coherent QPSK Receiver
- 발행일
- 200906
- 출처
- IEEE Photonics Technology Letters, v.21 no.11, pp.709-711
- ISSN
- 1041-1135
- 출판사
- IEEE
- 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.
- 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 hybrid, QPSK signal