Compensation for I/Q Imbalances and Bias Deviation of the Mach–Zehnder Modulators in Direct-Detected Optical OFDM Systems

Author

Peng, Wei-Ren ; Zhang, Bo ; Wu, Xiaoxia ; Feng, Kai-Ming ; Willner, Alan E. ; Chi, Sien

Author_Institution

Dept. of Photonics & Inst. of Electro-Opt. Eng., Nat. Chiao Tung Univ., Hsinchu

Volume

21

Issue

2

fYear

2009

Firstpage

103

Lastpage

105

Abstract

We demonstrate an equalization technique to simultaneously compensate for the fiber chromatic dispersion and the distortions induced by the in-phase/quadrature-phase (I/Q) imbalances and bias deviation in the Mach-Zehnder modulators (MZMs). With this technique, the requirement for the monitoring circuits at the transmitter could be relaxed or even eliminated, and thus simplifies the system design and reduces the system cost. The system exhibits a good performance with our proposal over a broad range of imbalances and bias deviation in the MZM. With deliberately introducing I/Q imbalances and bias deviation, we have observed a 2- and 4-dB optical signal-to-noise ratio improvement, for the back-to-back and 800 km of uncompensated standard single-mode fiber transmission, respectively, with our proposed scheme.

Keywords

OFDM modulation; optical communication equipment; optical distortion; optical fibre communication; optical fibre dispersion; optical modulation; MZM; Mach-Zehnder modulator; OFDM; bias deviation; direct-detected optical OFDM system; distance 800 km; equalization technique; fiber chromatic dispersion; in-phase/quadrature-phase imbalances; optical fiber communication; optical signal-to-noise ratio improvement; orthogonal frequency-division multiplexing; single-mode fiber transmission; Optical fiber communication; optical modulation; orthogonal frequency-division multiplexing (OFDM);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2008.2008819

Filename

4682712