All fiber filter
A filter, all-fiber technology, applied in the fields of optics and laser optoelectronics, can solve the problems of filter bandwidth dependence, non-tunable, difficult to control, etc., to avoid insertion loss and alignment difficulties, easy to use all-fiber, and easy to adjust the modulation depth. Effect
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[0024] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0025] Such as figure 1 As shown, the structure of the all-fiber filter controlled by the fiber ring of the first embodiment of the present invention includes:
[0026] A 2×2 fiber optic coupler 4 having a first port and a second port on one side, and a third port and a fourth port on the other side;
[0027] A polarization-maintaining optical fiber 11, whose ends are respectively fused with the passive optical fibers 7, 8 of the third port and the fourth port, and the fusion point is 12, thereby forming a ring optical path;
[0028] Wherein, the passive optical fiber 7 between the third port and the polarization maintaining optical fiber 11 is coiled into an optical fib...
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