CN1366200A - Polarization-independent tunable acousto-optic filter and its method - Google Patents

Polarization-independent tunable acousto-optic filter and its method Download PDF

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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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polarization
polarized light
acousto
optic
light
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CN1150420C (en
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林耕华
黄承彬
周维仁
杨淑媚
胡杰
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Industrial Technology Research Institute ITRI
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Abstract

The invention relates to a polarization-independent adjustable acousto-optic filter device and a method thereof, which are used for diffracting input light into first output light which is not influenced by sound waves and second output light which is influenced by the sound waves, the device and the method thereof utilize a polarization separator to separate the input light into two orthogonal beams of light, a plurality of polarization rotators rotate the polarization direction of the light by 90 degrees, an acousto-optic device rotates the polarization direction of specific wavelength light by 90 degrees, and the two orthogonal beams of light are combined through proper photosynthesis.

Description

With irrelevant adjustable acousto-optic filter and the method thereof of polarization
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.
First polarization separator 10 is used for polarization separation input light 100, makes it to become first polarized light and second polarized light of quadrature.First polarization separator 10 can be birefringece crystal.
First polarization rotator 20 is used to make the polarization direction of first polarized light of first polarization separator, 10 outputs to revolve to turn 90 degrees.First polarization rotator 20 can be half-wave plate or faraday's crystal.
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.
Second polarization separator 40 is used to receive first polarized light and second polarized light of acousto-optic device 30 outputs, and makes through the optical axis design direction of second polarization separator 40 and to be subjected to acoustooptic effect in the win polarized light and second polarized light and to cause to polarize and revolve the long light of specific filter that turn 90 degrees and separate respectively and become the 3rd and the 4th polarized light.Second polarization separator 40 can be birefringece crystal.
Second polarization rotator 50 is used to make the polarization direction of second polarized light of second polarization separator, 40 outputs and the 4th polarized light to revolve to turn 90 degrees.Second polarization rotator 50 can be half-wave plate or faraday's crystal.
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 separation 81 for the first time: separating input light is first polarized light and second polarized light.This step can be finished by birefringece crystal.
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 separation 84 for the second time: isolate the 3rd polarized light by first polarized light, second polarized light is isolated the 4th polarized light.This step can be finished by birefringece crystal.
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、一种与极化无关的可调式声光滤波装置，用于衍射一输入光，使之成为一不受声波影响的第一输出光与一受声波影响的第二输出光，包含：1. A polarization-independent adjustable acousto-optic filter device for diffracting an input light so that it becomes a first output light not affected by sound waves and a second output light affected by sound waves, comprising: 第一极化分离器，用于分离输入光为正交的第一偏振光与第二偏振光；The first polarization separator is used to separate the input light into orthogonal first polarized light and second polarized light; 第一偏振旋转器，用于使该第一极化分离器输出的第一偏振光的偏振方向旋转90度；a first polarization rotator, configured to rotate the polarization direction of the first polarized light output by the first polarization splitter by 90 degrees; 声光器，用于接收第一偏振旋转器输出的第一偏振光与第二偏振光，并产生声光效应，使特定波长光的偏振方向旋转90度；an acousto-optic device, configured to receive the first polarized light and the second polarized light output by the first polarization rotator, and generate an acousto-optic effect to rotate the polarization direction of light of a specific wavelength by 90 degrees; 第二极化分离顺，用于接收声光器输出的第一偏振光与第二偏振光，并由第一偏振光分离出第三偏振光，由第二偏振光分离出第四偏振光；The second polarization splitter is used to receive the first polarized light and the second polarized light output by the acousto-optic device, and separate the third polarized light from the first polarized light, and separate the fourth polarized light from the second polarized light; 第二偏振旋转器，用于使该第二极化分离器输出的第二偏振光与第四偏振光的偏振方向旋转90度；a second polarization rotator, configured to rotate the polarization directions of the second polarized light and the fourth polarized light output by the second polarization separator by 90 degrees; 第三偏振旋转器，用于使第二偏振旋转器输出的第三偏振光与第四偏振光的偏振方向旋转90度；以及The third polarization rotator is used to rotate the polarization directions of the third polarized light and the fourth polarized light output by the second polarization rotator by 90 degrees; and 第三极化分离器，用于合并第一偏振光与第二偏振光成为第一输出光，并合并第三偏振光与第四偏振光成为第二输出光。The third polarization splitter is used to combine the first polarized light and the second polarized light into the first output light, and combine the third polarized light and the fourth polarized light into the second output light. 2、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第一极化分离器为双折射晶体。2. The polarization-independent tunable acousto-optic filter device according to claim 1, characterized in that the first polarization separator is a birefringent crystal. 3、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第一偏振旋转器为半波片。3. The polarization-independent tunable acousto-optic filter device as claimed in claim 1, characterized in that the first polarization rotator is a half-wave plate. 4、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第一偏振旋转器为法拉第晶体。4. The polarization-independent tunable acousto-optic filter device as claimed in claim 1, characterized in that the first polarization rotator is a Faraday crystal. 5、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于声光器为声光晶体。5. The polarization-independent adjustable acousto-optic filter device according to claim 1, characterized in that the acousto-optic device is an acousto-optic crystal. 6、如权利要求5所述的与极化无关的可调式声光滤波装置，其特征在于声光器为TeO2晶体。6. The polarization-independent adjustable acousto-optic filter device as claimed in claim 5, characterized in that the acousto-optic device is a TeO2 crystal. 7、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第二极化分离器为双折射晶体。7. The polarization-independent tunable acousto-optic filter device according to claim 1, characterized in that the second polarization separator is a birefringent crystal. 8、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第二偏振旋转器为半波片。8. The polarization-independent tunable acousto-optic filter device as claimed in claim 1, characterized in that the second polarization rotator is a half-wave plate. 9、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第二偏振旋转器为法拉第晶体。9. The polarization-independent tunable acousto-optic filter device as claimed in claim 1, characterized in that the second polarization rotator is a Faraday crystal. 10、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第三偏振放置器为半波片。10. The polarization-independent tunable acousto-optic filter device according to claim 1, characterized in that the third polarization placer is a half-wave plate. 11、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第三偏振旋转器为法拉第晶体。11. The polarization-independent tunable acousto-optic filter device according to claim 1, characterized in that the third polarization rotator is a Faraday crystal. 12、如权利要求1所述的与极化无关的可调式声光滤波装置，其特征在于第三极化分离器为一双折射晶体。12. The polarization-independent tunable acousto-optic filter device as claimed in claim 1, characterized in that the third polarization separator is a birefringent crystal. 13、一种与极化无关的可调式声光滤波方法，用于衍射一输入光成为一不受声波影响的第一输出光与一受声波影响的第二输出光，其特征在于该方法包含下列步骤：13. A polarization-independent adjustable acousto-optic filtering method for diffracting an input light into a first output light not affected by acoustic waves and a second output light affected by acoustic waves, characterized in that the method comprises Follow these steps: 第一次极化分离：分离输入光为第一偏振光与第二偏振光；The first polarization separation: split the input light into the first polarized light and the second polarized light; 第一次偏振旋转：使第一偏振光的偏振方向旋转90度；The first polarization rotation: rotate the polarization direction of the first polarized light by 90 degrees; 声光滤波：产生声光效应，使特定波长光的偏振方向旋转90度；Acousto-optic filtering: produce an acousto-optic effect to rotate the polarization direction of light of a specific wavelength by 90 degrees; 第二次极化分离：由第一偏振光分离出第三偏振光，由第二偏振光分离出第四偏振光；The second polarization separation: separate the third polarized light from the first polarized light, and separate the fourth polarized light from the second polarized light; 第二次偏振旋转：使第二偏振光与第四偏振光的偏振方向旋转90度；The second polarization rotation: rotate the polarization directions of the second polarized light and the fourth polarized light by 90 degrees; 第三次偏振旋转：使第三偏振光与第四偏振光的偏振方向旋转90度；以及The third polarization rotation: rotating the polarization directions of the third polarized light and the fourth polarized light by 90 degrees; and 极化合并：合并第一偏振光与第二偏振光成为该第一输出光，并合并第三偏振光与第四偏振光成为该第二输出光。Polarization combining: combining the first polarized light and the second polarized light to become the first output light, and combining the third polarized light and the fourth polarized light to become the second output light. 14、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第一极化分离步骤由双折射晶体完成。14. The polarization-independent tunable acousto-optic filtering method according to claim 13, characterized in that the first polarization separation step is completed by a birefringent crystal. 15、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第一偏振旋转步骤是由半波片完成。15. The polarization-independent tunable acousto-optic filtering method as claimed in claim 13, characterized in that the first polarization rotation step is performed by a half-wave plate. 16、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第一偏振旋转步骤是由法拉第晶体完成。16. The polarization-independent tunable acousto-optic filtering method as claimed in claim 13, characterized in that the first polarization rotation step is performed by a Faraday crystal. 17、如权利要求13所述的与极化无门面的可调式声光滤波方法，其特征在于声光滤波步骤是由声光晶体完成。17. The adjustable acousto-optic filtering method without polarization as claimed in claim 13, characterized in that the acousto-optic filtering step is completed by an acousto-optic crystal. 18、如权利要求17所述的与极化无关的可调式声光滤波方法，其特征在于声光滤波步骤的声光晶体为TeO2晶体。18. The polarization-independent adjustable acousto-optic filtering method according to claim 17, characterized in that the acousto-optic crystal used in the acousto-optic filtering step is a TeO2 crystal. 19、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第二极化分离步骤是由双折射晶体完成。19. The polarization-independent adjustable acousto-optic filtering method as claimed in claim 13, characterized in that the second polarization separation step is performed by a birefringent crystal. 20、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第二偏振旋转步骤是由半波片完成。20. The polarization-independent tunable acousto-optic filtering method as claimed in claim 13, characterized in that the second polarization rotation step is performed by a half-wave plate. 21、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第二偏振旋转步骤是由法拉第晶体完成。21. The polarization-independent tunable acousto-optic filtering method as claimed in claim 13, characterized in that the second polarization rotation step is performed by a Faraday crystal. 22、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第三偏振旋转步骤是由半波片完成。22. The polarization-independent tunable acousto-optic filtering method as claimed in claim 13, characterized in that the third polarization rotation step is completed by a half-wave plate. 23、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于第三偏振旋转步骤是由法拉第晶体完成。23. The polarization-independent tunable acousto-optic filtering method according to claim 13, characterized in that the third polarization rotation step is performed by a Faraday crystal. 24、如权利要求13所述的与极化无关的可调式声光滤波方法，其特征在于极化合并步骤是由双折射晶体完成。24. The polarization-independent tunable acousto-optic filtering method as claimed in claim 13, characterized in that the polarization combining step is completed by a birefringent crystal.
CNB011005858A 2001-01-16 2001-01-16 Adjustable acousto-optic filter independent of polarization and method thereof Expired - Fee Related CN1150420C (en)

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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
CN111413812A (en) * 2020-05-11 2020-07-14 中国电子科技集团公司第二十六研究所 A polarization independent fiber acousto-optic device

Cited By (5)

* Cited by examiner, † Cited by third party
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
CN111413812A (en) * 2020-05-11 2020-07-14 中国电子科技集团公司第二十六研究所 A polarization independent fiber acousto-optic device

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