Swept Frequency Measurement of Electrooptic Phase Modulators Using Dispersive Fibers
ZHANG Shang-Jian**, ZHANG Xiao-Xia, LIU Yong
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Optoelectronic Information, University of Electronic Science & Technology of China, Chengdu 610054
Abstract：A novel method based on the use of dispersive fibers is proposed and experimentally demonstrated for measuring the high-frequency modulation index, as well as the half-wave voltage, of electro-optic phase modulators. Fiber dispersion causes the phase modulated signal to become intensity modulated, which allows for the high resolution swept frequency measurement of phase modulators, using a vector network analyzer. The proposed method holds without the restriction of small-signal approximation, which is applicable for the measurement at different driving levels and operating wavelengths.
2012, Vol. 29 
