Theory of 2×2 switch based on electro-optic and piezoelectric effects in photorefractive LiNbO3 crystal

✍ Scribed by Xiaona Yan; Hua Zou; Xihua Yang; Huifang Zhang; Yan Wang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 434 KB
• Volume: 42
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2009.10.001

✦ Synopsis

Based on the electro-optic and piezoelectric effects, the principle of a 2 Â 2 bypass-exchange switch in photorefractive LiNbO 3 crystal is discussed. In photorefractive volume grating, the Bragg condition can be changed by applying a field during readout. That is, by applying a specific field E s or zero, the diffraction efficiency will be 0 or 1, respectively and this property can be used to realize the bypass or exchange operation of the switch. In this paper, considering both the piezoelectric and electro-optic effects caused by the applied electric field, we analyzed relations of both the specific field and the incident intensity ratio with respect to the writing angles and polarizations of writing beams.