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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

Inactive Publication Date: 2013-08-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of slow tuning speed of traditional fiber gratings, poor stability and high insertion loss of electro-optic polymer waveguide grating devices, and provide a polarization controller and waveguide grating based on polarization controller and waveguide grating with simple structure, stable performance and higher tuning sensitivity. Dynamic Tunable Filter

Method used

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  • Dynamic tunable filter based on polarization controller and waveguide grating and tuning method
  • Dynamic tunable filter based on polarization controller and waveguide grating and tuning method
  • Dynamic tunable filter based on polarization controller and waveguide grating and tuning method

Examples

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Embodiment 1

[0035] 1. Dynamically tunable filter

[0036] Such as figure 1 As shown, it is a dynamically tunable filter based on a polarization controller and a waveguide grating. Its structure includes two parts: a polarization controller and a waveguide grating. The light 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 base 7 of the waveguide grating, a grooved waveguide 5 and a wrinkled-order Bragg grating 4 are respectively arranged on the middle upper part of the substrate, and phase adjustment electrodes 3 (V a ), wavelength tuning electrodes 2 (V b ), the phase adjustment electrode (V a ) and the wavelength tuning electrode (V b ) is provided with an insulating (isolating) strip 6 between them.

[0038] The waveguide grating uses X-cut lithium niobate crystal as the substrate, and the substrate is placed in octadecanoic acid (CH...

Embodiment 2

[0052] In this embodiment, the grooved waveguide width d=7μm in the present invention, the wrinkled order Bragg grating length L b =10.36mm, the grating period Λ=362.3nm, the etching depth w=50nm, the etching duty ratio is 1 / 2, and the voltage on both sides is v b . The length of the grooved waveguide without grating written is L a =3.45mm, the voltage on 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 in Example 2. It can be seen from the figure that 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 etch depth greatly degrades the filtering performance, and reducing the waveguide width (electrode spacing) increases the tuning sensitivity for reflected wavelengths.

[0054] Figur...

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Abstract

The invention discloses a dynamic tunable filter based on a polarization controller and a waveguide grating and a tuning method. The filter structure comprises the polarization controller and the waveguide grating, wherein the polarization controller is a linearly polarized device. An X-cut lithium niobate crystal serves as a substrate of the waveguide grating, a groove-type waveguide structure is manufactured on the substrate, a wrinkly rank bragg grating is etched at one end of a waveguide, and electrodes are arranged on two sides of the groove-type waveguide and two sides of the wrinkly rank bragg grating in an electroplate mode respectively. The reflex resonant wavelength can be fast tuned by adjusting voltage exerted on the two sides of the wrinkly rank bragg grating, a reflected wave phase is tuned at a high speed by adjusting voltage exerted on two sides of the groove-type waveguide, and at last, the reflected wave light strength is dynamically controlled by controlling the angles of the linearly polarized device. The dynamic tunable filter has the advantages of being high in integration level and tunable sensitivity, good in stability, suitable for being applied to all optical network communication with ultrahigh speed and large capacity, and the like.

Description

technical field [0001] The invention relates to a fast tunable narrow-band filter, in particular to a dynamically tunable filter based on a polarization controller and a waveguide grating. Background technique [0002] As a basic wavelength selective component, the grating made of optical fiber or optical waveguide has a very wide range of applications in the fields of optical communication and optical sensing. According to the size of the grating period, it can be divided into long-period gratings with a period length of 100 μm and Bragg gratings with a period size of less than 1 μm. Among them, the short-period Bragg grating can greatly reflect a specific wavelength that meets the Bragg condition. It has the function of narrow-band filtering. [0003] Fiber gratings are easy to manufacture, low loss, and easy to connect. They are often used as optical filters, dispersion compensators, and optical sensors in the fields of optical communication and optical sensing. ), only...

Claims

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Application Information

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IPC IPC(8): G02F1/035G02B6/12
Inventor 张爱玲李玉祥
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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