CN1366200A - Polarization-independent regualtable acousto-optic filter and its method - Google Patents
Polarization-independent regualtable acousto-optic filter and its method Download PDFInfo
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- CN1366200A CN1366200A CN 01100585 CN01100585A CN1366200A CN 1366200 A CN1366200 A CN 1366200A CN 01100585 CN01100585 CN 01100585 CN 01100585 A CN01100585 A CN 01100585A CN 1366200 A CN1366200 A CN 1366200A
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Abstract
The invention relates to a device of adjustable acoustic-optical filter and its method non relevant to polarization. Input light to be diffracted becomes first output light not affected by acoustic wave and second output light affected by acoustic wave. The input light is separated into two orthogonal beams by using the polarization separator in the invention. Several polarization rotators make polarization direction of light rotate 90 degrees. Acoustic-optic apparatus makes polarization direction of specific light rotate 90 degrees. The two orthogonal beams are then combined. The filtration mode is non relevant to the polarization property of the incident light. The invention has features of high radio of beam split, small volume and low cost.
Description
The present invention relates to a kind of polarize irrelevant adjustable acousto-optic filter and method thereof, particularly relate to a kind of that can be applicable to high density wavelength-division multiplex (DWDM) system and irrelevant adjustable acousto-optic filter and the method thereof of polarization.
When sound wave passes through medium, in periodically elastic deformation of the inner generation of medium, make the refractive index of medium produce cyclical variation, be equivalent to a mobile phase grating, light will be by the phase grating diffraction, and this kind phenomenon is called " acoustooptic effect ".
Adjustable acousto-optic filter (being called for short AOTF) is a kind of assembly that utilizes acoustooptic effect.When input light when comprising many different wave lengths, can make the light diffracted output respectively of different wave length by means of the frequency that change adds sound wave.Because the centre wavelength that penetrates can be adjusted through the frequency of sound wave that adds, and can have a plurality of frequency bands that penetrate simultaneously, therefore adjustable acousto-optic filter can be applicable to the high density wavelength-division multiplex system.
As the key element in the dwdm system, adjustable acousto-optic filter must possess following condition: high resolving power, high rejection ratio and irrelevant with polarization.High resolving power is meant the accurately special frequency band of limiting filter.High rejection ratio refers to only special frequency band be carried out filtering and do not influence other frequency.Irrelevant with the irrelevant filter effect that is meant of polarization with input polarisation of light polarity.Known technology is for example: United States Patent (USP) 5329397,5359451,5410371,5946128,5909304 can't be taken into account fully for these three conditions.
Adjustable acousto-optic filter can be divided into " conllinear " and " non-colinear " two big classes.Non-colinear is meant that light wave and sound wave axially do not advance same, United States Patent (USP) 6,016, the 216 irrelevant adjustable acousto-optic filters of a kind of non-colinear and polarization that propose can satisfy aforesaid three bar important documents, but the polarization optical splitter that the disclosed method of this patent adopts (being called for short PBS) costs an arm and a leg, and advancing of light is not along the single axial direction, causes bulky and the beam split ratio is on the low side.Because the spectroscopic distance of light beam is excessive, must use two transducers, required microwave energy is higher.
In view of this, how to propose a kind of meet high resolving power, high rejection ratio, with the adjustable acousto-optic filter of conditions such as polarization is irrelevant, and can reduce volume, reduce cost, be a technical task that waits to solve really.
Purpose of the present invention be exactly propose a kind of meet high-res, high rejection ratio, with conditions such as polarization is irrelevant and the adjustable acousto-optic filter and the method thereof that reduce volume, reduce cost.
Therefore, the present invention proposes adjustable acousto-optic filter and method thereof a kind of and that polarization is irrelevant, is used for diffraction input light, makes it to become the first second output light of exporting light and influenced by sound wave that not influenced by sound wave.
The present invention utilizes first polarization separator will import first polarized light and second polarized light that light is separated into quadrature, first polarization rotator revolves the polarization direction of first polarized light and turn 90 degrees, acousto-optic device generation acoustooptic effect is revolved the polarization direction of special wavelength light and is turn 90 degrees, second polarization separator makes first polarized light isolate the 3rd polarized light, and make second polarized light isolate the 4th polarized light, second polarization rotator revolves the polarization direction of second polarized light and the 4th polarized light and turn 90 degrees, the 3rd polarization rotator revolves the polarization direction of the 3rd polarized light and the 4th polarized light and turn 90 degrees, the 3rd polarization separator merges first polarized light and second polarized light, make it to become the first output light that not influenced by sound wave, and merge the 3rd polarized light and the 4th polarized light, make it to become the second output light of the specific wavelength that is subjected to acoustic wave diffraction.
Below in conjunction with relevant detailed content of the present invention of description of drawings and technology, wherein:
Fig. 1 is x-z optical planar circuit figure and the y-z optical planar circuit figure with the irrelevant adjustable acousto-optic filter of polarization;
Fig. 2 is the polarization relation figure with the x-y plane of the irrelevant adjustable acousto-optic filter of polarization;
Fig. 3 is the process flow diagram with the irrelevant adjustable acousto-optic filtering method of polarization.
Please refer to Fig. 1, Fig. 1 is x-z optical planar circuit figure and the y-z optical planar circuit figure with the irrelevant adjustable acousto-optic filter of polarization.
The present invention is a kind of adjustable acousto-optic filter that has nothing to do with polarization, be used for diffraction input light and make it to become the first second output light of exporting light and influenced by sound wave that not influenced by sound wave, this acousto-optic filter comprises: first polarization separator 10, first polarization rotator 20, acousto-optic device 30, the second polarization separators 40, second polarization rotator 50, the 3rd polarization rotator 60, the 3rd polarization separator 70.
Acousto-optic device 30 is used to receive first polarized light and second polarized light of first polarization rotator, 20 outputs, and the generation acoustooptic effect revolves the polarization direction of special wavelength light to turn 90 degrees.Acousto-optic device 30 can be acousto-optic crsytal, for example: TeO2.
The 3rd polarization rotator 60 is used to make the polarization direction of the 3rd polarized lights of second polarization rotation, 50 outputs and the 4th polarized light to revolve to turn 90 degrees.The 3rd polarization rotator 60 can be half-wave plate or faraday's crystal.
The 3rd polarization separator 70 is used to merge first polarized light and second polarized light becomes the first output light 170, and makes up the 3rd polarized light and the 4th polarized light and become second of the specific wavelength that is subjected to acoustic wave diffraction and export light 171.The 3rd polarization separator 70 can be birefringece crystal.
Please refer to Fig. 2, Fig. 2 is the polarization relation figure with the x-y plane of the irrelevant adjustable acousto-optic filter of polarization.
After input light 100 incides first polarization separator 10, the polarised direction of light directly penetrates perpendicular to the part of optical axis becomes the first polarized light 111a, belong to ordinary ray, the part that its polarised direction is parallel to optical axis is separated into the second polarized light 111b via shift phenomenon, belong to special ray, obtain a displacement in-x direction.The first polarized light 111a revolves by first polarization rotator, 20 rear polarizer directions and turn 90 degrees, and makes win polarized light 121a and the second polarized light 121b be ordinary ray to acousto-optic filter 30; The condition that meets in incident after by acoustooptic effect and phase place, first polarized light comprises the composition 131a0 of special ray zeroth order (zero order) and the composition 131a1 of single order (first order), second polarized light comprises the composition 131b0 of zeroth order and the composition 131b1 of single order, and the polarization direction quadrature of the composition of zeroth order and the composition of single order, that is differ 90 degree.First polarized light becomes the 3rd polarized light 141a01 by 40 its polarization of second polarization separator with respect to second polarization separator 40 for the special ray person separates, second polarized light becomes the 4th polarized light 141b1 by 40 its polarization of second polarization separator with respect to second polarization separator 40 for the special ray person isolates.
This moment, the first polarized light 141a0 and the second polarized light 141b0 were all zeroth order light, and the 3rd polarized light 141a1 and the 4th polarized light 141b1 are all single order light.Second polarization rotator 50 revolves the polarization direction of the second polarized light 141b0 and the 4th polarized light 141b1 and turn 90 degrees.The 3rd polarization rotator 60 revolves the polarization direction of the 3rd polarized light 151a1 and the 4th polarized light 151b1 and turn 90 degrees.The first polarized light 161a0 that the 3rd polarization separator 70 merges zeroth orders becomes the first output light 170 with the second polarized light 161b0, and merges the 3rd polarized light 161a1 of single order and the 4th polarized light 161b1 and become second and export light 171.Because of the first output light 170 is made up by the zeroth order composition purely, not influenced by sound wave; The second output light 171 becomes the branch combination by single order purely, is the special wavelength light that influenced by sound wave.
Please refer to Fig. 3, Fig. 3 is the process flow diagram with the method for the irrelevant adjustable acousto-optic filtering of polarization.
The present invention is a kind of adjustable acousto-optic filtering method that has nothing to do with polarization, being used for diffraction one input light becomes the second output light that first an output light and one that not influenced by sound wave is influenced by sound wave, comprises the following step: polarization separation 81, polarization rotation for the first time 82, acousto-optic filtering 83, polarization separation 84, polarization rotation for the second time 85, polarization rotation for the third time 86, polarization for the second time for the first time merges 87.
Polarization rotation for the first time 82: the polarization direction of first polarized light is revolved turn 90 degrees.This step can be finished by half-wave plate or faraday's crystal.
Acousto-optic filtering 83: the generation acoustooptic effect is revolved the polarization direction of special wavelength light and is turn 90 degrees.This step can be by acousto-optic crsytal for example: the TeO2 crystal is finished.
Polarization rotation for the second time 85: the polarization direction of second polarized light and the 4th polarized light is revolved turn 90 degrees.This step can be finished by half-wave plate or faraday's crystal.
Polarization rotation for the third time 86: the polarization direction of the 3rd polarized light and the 4th polarized light is revolved turn 90 degrees.This step can be finished by half-wave plate or faraday's crystal.
Polarization merges 87: making up first polarized light and second polarized light becomes the first output light, and makes up the 3rd polarized light and the 4th polarized light and become second and export light.This step can be finished entirely by the birefringence crystalline substance.
The present invention is a kind of adjustable acousto-optic filter and method thereof that has nothing to do with polarization, meet high-res, high rejection ratio, with the condition of acousto-optic tunable filters such as polarization is irrelevant, because of adopting birefringece crystal to reduce cost, and beam split ratio height, the input of light and output all same axially on, finished-product volume is dwindled significantly, so advantages such as the present invention has high-res, high rejection ratio,, beam split ratio height irrelevant with polarization, volume is little, price is low.
Though disclose the preferred embodiments of the present invention as previously discussed; but this is not in order to limit the present invention; the common technique personnel of this area can carry out some changes and improvements under the condition of the spirit and scope that do not break away from the present invention, so protection scope of the present invention should be determined by accompanying.
Claims (24)
1, a kind of and irrelevant adjustable acousto-optic filter of polarization is used for diffraction one input light, and making it becomes the second output light that first an output light and one that not influenced by sound wave is influenced by sound wave, comprises:
First polarization separator, being used to separate input light is first polarized light and second polarized light of quadrature;
First polarization rotator is used to make the polarization direction of first polarized light of this first polarization separator output to revolve and turn 90 degrees;
The acousto-optic device is used to receive first polarized light and second polarized light of the output of first polarization rotator, and the generation acoustooptic effect, the polarization direction of special wavelength light is revolved turn 90 degrees;
Second polarization separation is suitable, is used to receive first polarized light and second polarized light of acousto-optic device output, and isolates the 3rd polarized light by first polarized light, isolates the 4th polarized light by second polarized light;
Second polarization rotator is used to make the polarization direction of second polarized light of this second polarization separator output and the 4th polarized light to revolve and turn 90 degrees;
The 3rd polarization rotator is used to make the polarization direction of the 3rd polarized light of second polarization rotator output and the 4th polarized light to revolve and turn 90 degrees; And
The 3rd polarization separator, being used to merge first polarized light and second polarized light becomes the first output light, and merges the 3rd polarized light and the 4th polarized light and become second and export light.
2, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that first polarization separator is a birefringece crystal.
3, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that first polarization rotator is a half-wave plate.
4, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that first polarization rotator is faraday's crystal.
5, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that the acousto-optic device is an acousto-optic crsytal.
6, the as claimed in claim 5 and irrelevant adjustable acousto-optic filter of polarization is characterized in that the acousto-optic device is the TeO2 crystal.
7, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that second polarization separator is a birefringece crystal.
8, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that second polarization rotator is a half-wave plate.
9, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that second polarization rotator is faraday's crystal.
10, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that the 3rd polarization placer is a half-wave plate.
11, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that the 3rd polarization rotator is faraday's crystal.
12, the as claimed in claim 1 and irrelevant adjustable acousto-optic filter of polarization is characterized in that the 3rd polarization separator is a birefringece crystal.
13, a kind of and irrelevant adjustable acousto-optic filtering method of polarization, being used for diffraction one input light becomes the second output light that first an output light and one that not influenced by sound wave is influenced by sound wave, it is characterized in that this method comprises the following step:
Polarization separation for the first time: separating input light is first polarized light and second polarized light;
Polarization rotation for the first time: the polarization direction of first polarized light is revolved turn 90 degrees;
Acousto-optic filtering: produce acoustooptic effect, the polarization direction of special wavelength light is revolved turn 90 degrees;
Polarization separation for the second time: isolate the 3rd polarized light by first polarized light, isolate the 4th polarized light by second polarized light;
Polarization rotation for the second time: the polarization direction of second polarized light and the 4th polarized light is revolved turn 90 degrees;
Polarization rotation for the third time: the polarization direction of the 3rd polarized light and the 4th polarized light is revolved turn 90 degrees; And
Polarization merges: merging first polarized light and second polarized light becomes this first output light, and merges the 3rd polarized light and the 4th polarized light and become this and second export light.
14, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that the first polarization separation step finished by birefringece crystal.
15, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that first polarization rotation step is to be finished by half-wave plate.
16, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that first polarization rotation step is to be finished by faraday's crystal.
17, as claimed in claim 13 and the polarization the no shop front adjustable acousto-optic filtering method, it is characterized in that the acousto-optic filter step is to be finished by acousto-optic crsytal.
18, the as claimed in claim 17 and irrelevant adjustable acousto-optic filtering method of polarization, the acousto-optic crsytal that it is characterized in that the acousto-optic filter step is the TeO2 crystal.
19, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that the second polarization separation step is to be finished by birefringece crystal.
20, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that second polarization rotation step is to be finished by half-wave plate.
21, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that second polarization rotation step is to be finished by faraday's crystal.
22, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that the 3rd polarization rotation step is to be finished by half-wave plate.
23, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization is characterized in that the 3rd polarization rotation step is to be finished by faraday's crystal.
24, the as claimed in claim 13 and irrelevant adjustable acousto-optic filtering method of polarization, the combining step that it is characterized in that polarizing is to be finished by birefringece crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011005858A CN1150420C (en) | 2001-01-16 | 2001-01-16 | Polarization-independent regualtable acousto-optic filter and its method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011005858A CN1150420C (en) | 2001-01-16 | 2001-01-16 | Polarization-independent regualtable acousto-optic filter and its method |
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| Publication Number | Publication Date |
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| CN1366200A true CN1366200A (en) | 2002-08-28 |
| CN1150420C CN1150420C (en) | 2004-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011005858A Expired - Fee Related CN1150420C (en) | 2001-01-16 | 2001-01-16 | Polarization-independent regualtable acousto-optic filter and its method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004040359A1 (en) * | 2002-10-14 | 2004-05-13 | Tianjin Sunshine Optics Technologies Co., Ltd. | A method for improving ratio of signal to noise in aotf splitting beam system |
| CN100392447C (en) * | 2003-12-24 | 2008-06-04 | 招远招金光电子科技有限公司 | Low polarization-related loss optical filter with adjustable wavelength in a wide range |
| CN102023397B (en) * | 2009-09-11 | 2013-02-06 | 福州高意通讯有限公司 | Dimmable filter |
| CN102096211B (en) * | 2009-12-10 | 2013-06-05 | 中国科学院西安光学精密机械研究所 | AOTF optical system with image drift compensation |
-
2001
- 2001-01-16 CN CNB011005858A patent/CN1150420C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004040359A1 (en) * | 2002-10-14 | 2004-05-13 | Tianjin Sunshine Optics Technologies Co., Ltd. | A method for improving ratio of signal to noise in aotf splitting beam system |
| CN100392447C (en) * | 2003-12-24 | 2008-06-04 | 招远招金光电子科技有限公司 | Low polarization-related loss optical filter with adjustable wavelength in a wide range |
| CN102023397B (en) * | 2009-09-11 | 2013-02-06 | 福州高意通讯有限公司 | Dimmable filter |
| CN102096211B (en) * | 2009-12-10 | 2013-06-05 | 中国科学院西安光学精密机械研究所 | AOTF optical system with image drift compensation |
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| Publication number | Publication date |
|---|---|
| CN1150420C (en) | 2004-05-19 |
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Granted publication date: 20040519 Termination date: 20110116 |