We measure the half-wave voltage of LiNbO<sub>3</sub> phase modulators in a 26-GHz wideband frequency range, and then analyze it by the phase modulation photonic peak gain linked to the interferometric demodulation. The optical interferometer is constructed with two 50:50 couplers and two fiber arms with a 1-m difference in fiber length. The photonic link gain peaks are frequency dependent, as indicated by the differential time delay in the interferometer. The procedure described is a new and practical half-wave voltage measurement method that can accurately predict the nonlinear frequency characteristics of the phase modulator. Moreover, the method can be applied to various types of LiNbO<sub>3</sub> phase modulators.
© 2013 Chinese Optics Letters
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(230.4110) Optical devices : Modulators
Instrumentation, Measurement, and Metrology
Quanyi Ye, Chun Yang, Yuhua Chong, and Xianghua Li, "An alternative phase modulator half-wave voltage measurement based on photonic link," Chin. Opt. Lett. 11, 071202- (2013)