High off ratio multi-channel magneto-optical switch

Abstract

The utility model relates to a kind of high off ratio multi-channel magneto-optical switch, including 1×N magneto-optical switch;N=2n, n is the integer greater than or equal to 2;1×N magneto-optical switch is constituted by a 1×2 magneto-optical switch series connection;The input end of 1×N magneto-optical switch is equipped with an input collimator;The output end of 1×N magneto-optical switch is respectively connected with N output collimators;1×1 magneto-optical switch is equipped between the output end of 1×N magneto-optical switch and output collimator;The utility model is by setting 1×1 magneto-optical switch at each output collimator, 1×1 magneto-optical switch is not only used for the output of signal, also constitutes isolator device, effectively promotes the off ratio of any channel, so that the off ratio of each channel of 1×N magneto-optical switch is greater than 40dB, and the structure also realizes the demand of high isolation degree;The series connection structure of 1×2 magneto-optical switch can effectively component multi-channel magneto-optical switch, simplify structure.

Claims

1. A high turn-off ratio multi-channel magneto-optical switch, characterized in that: Includes a 1×N magneto-optical switch; where N=2 n n is an integer greater than or equal to 2; the 1×N magneto-optical switch is composed of A series of 1×2 magneto-optical switches (100) are connected; the input end of the 1×N magneto-optical switch is provided with an input collimator (10); the output end of the 1×N magneto-optical switch is connected to N output collimators (20); a 1×1 magneto-optical switch (200) is provided between the output end of the 1×N magneto-optical switch and the output collimator (20); the 1×2 magneto-optical switch (100) includes a first polarizing beam splitter (110), a first waveplate (120), a first optical rotation component (130), and a second polarizing beam splitter (140) arranged along the optical path; the first polarizing beam splitter (110) includes a first polarizing beam splitter surface (111) and a first reflecting surface (112) arranged parallel to the first polarizing beam splitter surface (111). The second polarizing beam splitter (140) includes a second polarizing beam splitter (141) and a second reflecting surface (142) parallel to the second polarizing beam splitter (141); the first polarizing beam splitter (111) is arranged relative to the second reflecting surface (142) along the optical path direction; the first reflecting surface (112) is arranged relative to the second polarizing beam splitter (141) along the optical path direction; the 1×1 magneto-optical switch (200) includes two optical wedges (210) and a second optical rotating component (220); the two optical wedges (210) are respectively arranged at both ends of the second optical rotating component (220); the two optical wedges (210) correspond to one output end and one output collimator (20) of the 1×N magneto-optical switch respectively.

2. The high turn-off ratio multi-channel magneto-optical switch according to claim 1, characterized in that: The first waveplate (120) is a 22.5° waveplate.

3. A high extinction ratio multi-path magneto-optical switch according to claim 1, wherein: the first and second magneto-optical elements are made of a material having a magneto-optical effect. The first optical rotation component (130) includes a first magneto-optical crystal (131) disposed within a first magnetic element (132); the first magnetic element (132) generates positive and negative magnetic fields according to the direction of current flow to control the optical rotation direction of the first magneto-optical crystal (131) to be positive or negative.

4. A high extinction ratio multi-path magneto-optical switch according to claim 3, wherein: The optical rotation angle of the first magneto-optical crystal (131) is positive 45° or negative 45°; both light-transmitting surfaces of the first magneto-optical crystal (131) are provided with anti-reflection coatings; the first magnetic element (132) is a single-coil or state-locked electromagnet.

5. A high extinction ratio multi-path magneto-optical switch according to claim 3, wherein: A light-transmitting structure (150) is provided between the first magneto-optical crystal (131) and the second polarizing beam splitter (140); the first magnetic element (132) is a coil; the first magnetic element (132) is wound around the first magneto-optical crystal (131) and the light-transmitting structure (150).

6. A high extinction ratio multi-path magneto-optical switch according to claim 1, wherein: The second optical rotation component (220) includes a second magneto-optical crystal (221) disposed within a second magnetic element (222); the second magnetic element (222) generates positive and negative magnetic fields according to the direction of energization to control the optical rotation direction of the first magneto-optical crystal (131) to be positive or negative.

7. A high extinction ratio multi-path magneto-optical switch according to claim 6, characterized in that: The optical rotation angle of the second magneto-optical crystal (221) is positive 45° or negative 45°; the second magnetic element (222) is a single coil or a state latching electromagnet.

8. A high turn-off ratio multi-channel magneto-optical switch according to claim 6, characterized in that: Both of the two optical wedges (210) and the second magneto-optical crystal (221) have anti-reflection coatings on their two light-transmitting surfaces.

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