Dynamic tunable filter based on polarization controller and waveguide grating and tuning method
A polarization controller and tuning filter technology, which is applied to optical waveguides, optics, instruments, etc., can solve the problems of high insertion loss, poor stability of electro-optic polymer waveguide grating devices, and slow tuning speed, and achieves low insertion loss, Excellent tunable performance and good stability
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[0034] Example 1,
[0035] 1. Dynamically tunable filter
[0036] Such as figure 1 As shown, it is a dynamic tunable filter based on a polarization controller and a waveguide grating. Its structure includes a polarization controller and a waveguide grating. The polarization controller and the waveguide grating are coupled and connected by an optical fiber 8, and the polarization controller is used to The intensity of the reflected wave is controlled, and the resonant wavelength and the phase of the reflected wave are controlled by the waveguide grating part.
[0037] The waveguide grating includes a substrate 7 of the waveguide grating. A grooved waveguide 5 and a corrugated Bragg grating 4 are respectively arranged on the upper middle part of the substrate, and phase adjustment electrodes 3 (V a ), there are wavelength tuning electrodes 2 (V b ), phase adjustment electrode (V a ) And wavelength tuning electrode (V b ) Is provided with insulation (isolation) tape 6.
[0038] The waveg...
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[0051] Example 2
[0052] In this embodiment, the grooved waveguide in the present invention has a width d=7μm and a wrinkled Bragg grating length L b =10.36mm, grating period Λ=362.3nm, etching depth w=50nm, etching duty cycle is 1 / 2, voltage v is applied on both sides b . The length of the grooved waveguide without grating is L a =3.45mm, the voltage applied to both sides is v a . The spacing between the electrodes is equal to the width of the waveguide.
[0053] Figure 7 It reflects the tuning relationship between the filter reflection spectrum and the applied voltage under the parameter settings of Example 2. As can be seen from the figure, when the applied voltage changes from -100v to +100v, the resonance wavelength tuning range is 3nm and the tuning sensitivity is 15pm / v. Reducing the etching depth will greatly reduce the filtering performance, and reducing the waveguide width (electrode spacing) will increase the tuning sensitivity of the reflected wavelength.
[0054] Fi...
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