Optical Vector Network Analyzer with an Improved Dynamic Range Based on a Polarization Multiplexing Electro-Optic Modulator

• Published in: Chinese physics letters 2017-05, Vol.34 (5), p.63-67
• Main Author: 王琪 王文亭 陈伟 刘建国 祝宁华
• Format: Article
• Language: English
• Subjects: 偏振复用; 偏置电压; 光纤布拉格光栅; 动态范围; 带通滤波器; 电光调制器; 矢量网络分析仪; 调制信号
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/34/5/054205

We present a new method to achieve an optical vector network analyzer （OVNA） based on a polarization multi- plexing electro-optic modulator （PM-EOM） without an optical bandpass filter. Optical single sideband （OSSB） modulated signals with a tunable optical carrier-sideband ratio （OCSR） are obtained at the output of the PM- EOM. The OCSR can be flexibly tuned by controlling bias voltages of the PM-EOM. The dynamic range of the OVNA is expanded by taking the improvement of the OCSR into account. The transmission response of an optical device under test （ODUT） is measured based on one-to-one mapping from optical domain to electrical domain. By optimizing the OCSR of the OSSB modulated signals, the dynamic range of the OVNA can be effectively improved with 3.TdB. An analytical model is derived to describe the transfer function of the ODUT. The magnitude and phase responses of a fiber Bragg grating are characterized with a large dynamic range.