The Research And Fabrication Of Magneto-optic Switch Based On The Leveling And Coupling Of Linear Polarized Light And Photoptical Detecting

With more demands of capacity and speed in transmission in current communication systems, a higher system was put forward. Optical communication system is developed apace because it has so many merits such as tremendous transmit bandwidth, very low transmit losses and anti-interfere of strong electromagnetism. All optical exchange scheme has been the trend of modern optical network with the development of optical communication system and application of Dense Wavelength-Division Multiplexing (DWDM), optical switch is the key element of all optical network (AON).The optical switch, which are used in Optical Add/Drop Multiplexer (OADM), Optical Cross Connect (OXC) and DWDM etc., is the key consideration in AON. The research and fabrication of optical switch become the hotspot in the optical communication.1×2 magneto-optical switch is designed in this paper, which is based on Faraday effect, and contains of the linear polarized light routes, electrocircuit and magnetic field and test of the switching time. The following are the main research contents:(1)The linear polarized light routes. The linear polarized light routes are the core of the magneto-optical switch, which comprise Polarization Beam Splitter (PBS), Dual Polarization Beam Combiner (DPBC), and Yttrium Iron Garnet (YIG) and so on. The selection of the elements of PBS and DPBC, the post-process of YIG magneto-optical single fiber were done in this paper, and did analysis and experiment on the coupling, insert-loss and polarization of the linear polarized light. At last, the whole optical routes were tested and leveled.(2)Electrocircuit and Magnetic field. The magnetic field is key component of magnetic field, trigged by the electrocircuit, which decides the switching time. The design I and II were introduced in this paper. The design I borrowed ideas from magneto-optical modulator, which contains nanosecond impulser. The design II adopted the windings and was trigged by AT89S52 and MC33886. The nanosecond implusers were fabricated, the magnetic field was simulated by ANSYS and the trigger circuits were tested.(3) The test of the switching time.The switching time is one of the most important specifications in AON. The switching time was tested by photoptical detector. The switching time was 1.443μs in the experiment at last.