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Compensation of quadrature imbalance in an optical coherent OQPSK receiver in presence of frequency offset |
Xinying LI, Bo HUANG, Yufeng SHAO, Junwen ZHANG, Shumin ZOU, Wuliang FANG, Li TAO, Jiangbo ZHU, Chi NAN( ) |
| Department of Communication Science and Engineering, State Key Laboratory of Application Specific Integrated Circuit (ASIC) and System, Fudan University, Shanghai 200433, China |
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Abstract In this paper, we describe the impact of quadrature imbalance (QI) in the presence of frequency offset in an optical coherent offset quadrature phase shift keying (OQPSK) receiver. Arbitrary conjugate misalignment was realized in a 2×4 90° optical hybrid, and the ellipse correction (EC) method of quadrature imbalance was applied in our simulation. In the case of transmission, the EC method can significantly improve the system performance.
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| Keywords
offset quadrature phase shift keying (OQPSK)
quadrature imbalance (QI)
ellipse fitting
frequency offset
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Corresponding Author(s):
NAN Chi,Email:nanchi@fudan.edu.cn
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Issue Date: 05 September 2011
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