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Proceedings Paper

Research on 1x2 all fiber high-speed magneto-optic switch
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Paper Abstract

In this paper two new types of 1x2 all fiber high-speed magneto-optic switches with thick film ferromagnetic bismuth-substituted rare-earth iron garnets are proposed and tested. Two types of magneto-optic switches are discussed by using two kinds of crystals. One is the ordinary switch which needs indurance magnetic field to maintain its state; And the other is latching type switch, the crystal remains in a given magnetic state for unlimited duration without energy supply. Circuits used to generate magnetic field are also discussed. The theoretical and experimental analysis of optical route, measurement of switching time and magnetic filed etc. are included. The extinction ratio of the switches are currently about 20 dB. It can be improved further by additional Faraday rotation created by another magneto-optic (MO) material in the light path. The switching time of MO material is under 100 ns, it can be ignored. Magnetic field should be able to change the voltage rapidly in order to obtain fast operating time of the optical switch. The inductance of the solenoid used for generating the required magnetic field is the bottleneck for rapid switching of the magnetic field in the MO material. The switching time of the two optical switch are discussed.

Paper Details

Date Published: 11 November 2008
PDF: 9 pages
Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 71341Y (11 November 2008); doi: 10.1117/12.804037
Show Author Affiliations
Shaohan Lin, Xiamen Univ. (China)
Zihua Weng, Xiamen Univ. (China)
Minfeng Wang, Xiamen Univ. (China)
Xu Chen, Xiamen Univ. (China)
Jianjian Ruan, Xiamen Univ. (China)

Published in SPIE Proceedings Vol. 7134:
Passive Components and Fiber-based Devices V
Ming-Jun Li; Ping Shum; Ian H. White; Xingkun Wu, Editor(s)

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