Magneto-optical Switch Based On The Magneto-optical Fiber And High-speed All-optical Magnetic Field

In the research, a novel all-fiber magneto-optic switch was first developed based on the Faraday Effect, optic fiber polarization beam splitter/combiner, magneto-optic crystal/glass fiber, nanosecond impulser and high-speed magnetic field etc. This micro all-optic switch is characterized of simplicity in structure, high switching speed, and easy integration etc.The study on all-fiber magneto-optic switch mainly includes as follows:1) The key research of all-fiber magneto-optic switch. The magneto-optic switch made of magneto-optic material fiber and optic-fiber polarization beam splitter/combiner is called all-fiber magneto-optic switch. The research of all-fiber magneto-optic switch focuses on aspects of searching for magneto-optic material fiber, optic-fiber polarization beam splitter/combiner, Faraday rotator and integration in large scale etc. The magneto-optic material fiber is made successfully recently, but there is still some distance between its performance and the goal people expect. The diameter of magneto-optic crystal fiber with better features is about 300-500 μm.2) The design and analysis of all-fiber magneto-optic switch made of magneto- optic crystal fiber. Making use of the magneto-optic crystal fiber, high-speed Faraday rotator and optic-fiber polarization beam splitter/combiner, the all-fiber magneto-optic switch of magneto-optic crystal fiber is designed. The design scheme substitutes magneto-optic crystal fiber for bulky magneto-optic crystal. Its optic route design includes the linear layout of magneto-optic crystal fiber, the optic route design of polarized light in optic-fiber polarization beam splitter/combiner, the magnetic route design and analysis of linear solenoid in the Faraday rotator, the analysis of simplicity in structure and versatility etc. The design scheme is characterized of simplicity in structure, polarization independence, small bulk, flexible bend and easy integration etc.3) The design and analysis of all-fiber magneto-optic switch made of magneto-optic glass fiber. Using the magneto-optic glass fiber, high-speed Faraday rotator and optic-fiber polarization beam splitter/combiner, the all-fiber magneto-optic switch based on magneto-optic glass fiber is designed. The design scheme substitutes magneto-optic glass fiber for magneto-optic crystal fiber. Its optic route design includes the loopy layout of magneto-optic crystal fiber, the optic route design of polarized light in optic-fiber polarization beam splitter/combiner, the magnetic route design and analysis of loopy solenoid in the Faraday rotator, the analysis of simplicity in structure and versatility etc. The magneto-optic glass fiber in the design scheme can be bent in several circles to minish the bulk. It also can increase the Faraday rotation angle, improve measurement accuracy, decrease driving voltage and reduce power wasting.4) Fabrication and testing of nanosecond impulser. The nanosecond impulser is designed and fabricated to output nanosecond pulse current. The high-speed control technology of all-fiber magneto-optic switch mainly relies on the performance of nanosecond impulser. The length of switching time is an important parameter in magneto-optic switch. One of the key parts of all-fiber magneto-optic switch is that the response time should keep at nanosecond level. With theavalanche features of normal transistor which is of high frequency and small power, such as 2N5551, the nanosecond impulser can output the nanosecond pulse current to drive the high-speed magnetic field. The testing results indicate that the nanosecond impulser with cheap and simple electric circuit is characterized of good stability, nanosecond raising edge, large amplitude and high repeatability, and it can output the nanosecond pulse which impulse width is 10-100 ns and impulse amplitude is 10-90 V.5) The analysis and fabrication of electric solenoid with high-speed magnetic field. The electric solenoid driven by nanosecond pulse current is designed and fabricated to output the high-speed magnetic field. One of the key parts of...