National Natural Science Foundation of China [60677039]The paper studies an all fiber high-speed magneto-optic switch which includes an optical route, a nanosecond pulse generator, and a magnetic field module in order to reduce the switching time of the optical switch in the all optical network. A compact nanosecond pulse generator can be designed based on the special character of the avalanche transistor. The output current pulse of the nanosecond pulse generator is less than 5 ns, while the pulse amplitude is more than 100 V and the pulse width is about 10 to 20 ns, which is able to drive a high-speed magnetic field. A solenoid is used as the magnetic field module, and a bismuth-substituted rare-earth iron garnet single crystal is chosen as the Faraday rotator. By changing the direction of current in the solenoid quickly, the magnetization of the magneto-optic material is reversed, and the optical beam can be rapidly switched. The experimental results indicate that the switching time of the device is about 100 to 400 ns, which can partially meet the demand of the rapid development of the all optical network. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3619823
In the paper, a high speed magneto-optic switch based on the Faraday Effect is designed and analyzed. The novel magneto-optic switch presented in this paper will satisfy high speed transmission and exchange of optical-message through all-optic network. It consists of three important components as followed novel optical route, Faraday rotator configuration with ultrafast magnetic field and picosecond impulser. It may switch the optical route by controlling Faraday rotator which is supplied by picosecond impulser. By the development of the magneto-optic crystal, and ultrafast magnetic field, the designed magneto-optic switch featured as low insertion loss, low crosstalk, high switching speed and small bulky size gets ahead of traditional optic switches. As the first part of this paper, a design scheme of optical route in high speed magneto-optic switch and its experiment analysis will be discussed. Good avalanche effect of transistor FMMT415 is adopted to generate picosecond pulse signal and then to drive the high speed magnetic field. Shown by the experiment data, the rising time of the impulse about 1ns, the amplitude of the impulse about 100~500V are available on the Output end from the picosecond impulser, which can be used as driving current pulse of Faraday rotator. By using the relationship between the polarization plane rotate direction of polarization light and magnetic direction, the Faraday rotator is designed.
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