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Magneto-optic fiber Sagnac modulator based on magnetic fluids
Authors:Zu Peng  Chan Chi Chiu  Siang Lew Wen  Jin Yongxing  Zhang Yifan  Fen Liew Hwi  Chen Lihan  Dong Xinyong
Institution:School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459.
Abstract:A magneto-optic modulator with a magnetic fluid film inserted into an optical fiber Sagnac interferometer is proposed. The magnetic fluid exhibits variable birefringence and Faraday effect under external magnetic field that will lead to a phase difference and polarization state rotation in the Sagnac interferometer. As a result, the intensity of the output light is modulated under the external magnetic field. Moreover, the modulator has a high extinction ratio and can easily be integrated in a single-mode fiber system. The performance of the modulator is not affected by ambient temperature variation from room temperature to 40 °C.
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