Linearization of periodic phase response for liquid crystal modulator

Wenjian Jia; Yubo Li; Li Chen; Minghua Wang; Jianyi Yang

doi:10.1117/12.802607

18 November 2008 Linearization of periodic phase response for liquid crystal modulator

Wenjian Jia, Yubo Li, Li Chen, Minghua Wang, Jianyi Yang

Proceedings Volume 7135, Optoelectronic Materials and Devices III; 71351G (2008) https://doi.org/10.1117/12.802607
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China

Abstract

Liquid crystal modulator(LCM) is now widely applied, especially in optical telecommunication networks. However, according to the electro-optic characteristic of liquid crystal, we will obtain nonlinear phase response when LCM is driven by the voltage varying with time linearly(v=kt+v0). And in practical application this nonlinear phase response will affect the modulation precision, communication modulation efficiency and so on. This paper presents a logarithm driving signal model to linearize the nonlinear phase response of LCM between 0 and π. When driven by a periodic signal whose voltage varies from 2.0 to 10.7V in the way of logarithm in every periods, the LCM's phase response hops in the point of intersection of two voltage periods. Therefore, we advance another periodic logarithm driving signal, whose voltage ascends from 2.0 to 10.7V in first half periods and descends from 10.7 to 2.0V in the other half periods. Furthermore, We find that the degree of phase response linearization of LCM decreases with the frequency of driving signal increasing. This paper proposes mapping the nonlinear phase response to linear one to overcome this problem. The experimental results indicate that obtaining the linear phase response of liquid crystal between 0 and π with different-frequency driving signals is feasible.

Citation Download Citation

Wenjian Jia, Yubo Li, Li Chen, Minghua Wang, and Jianyi Yang "Linearization of periodic phase response for liquid crystal modulator", Proc. SPIE 7135, Optoelectronic Materials and Devices III, 71351G (18 November 2008); https://doi.org/10.1117/12.802607

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