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Impact of Quadrature Imbalance in Optical Coherent QPSK Receiver
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- 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
- 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