CN211653337U - Polarization-maintaining magneto-optical attenuator - Google Patents
Polarization-maintaining magneto-optical attenuator Download PDFInfo
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- CN211653337U CN211653337U CN201922359331.5U CN201922359331U CN211653337U CN 211653337 U CN211653337 U CN 211653337U CN 201922359331 U CN201922359331 U CN 201922359331U CN 211653337 U CN211653337 U CN 211653337U
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- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 230000010287 polarization Effects 0.000 claims abstract description 41
- 230000003287 optical effect Effects 0.000 claims abstract description 27
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 230000001427 coherent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model relates to a polarization-maintaining magneto-optical attenuator, which comprises a polaroid, a Faraday rotary crystal, a variable magnetic field applying mechanism for applying a variable magnetic field, and a polarization-maintaining double-optical-fiber collimator for emitting optical signals and receiving optical signals; the variable magnetic field applying mechanism is sleeved outside the Faraday rotary crystal, and the direction of the variable magnetic field applied by the variable magnetic field applying mechanism is parallel to the horizontal axis. The utility model discloses utilized the high characteristic of polarization maintaining light path system input signal light polarization degree, the characteristics of polaroid absorption and its polarization direction inconsistent polarized light. The structure of the light path is effectively simplified. Make the utility model discloses a polarization maintaining magneto-optical attenuator has simple structure, and is small, no moving part, and reliability and repeatability are good, and the debugging assembly is simple, characteristics such as material cost low.
Description
Technical Field
The utility model belongs to the technical field of optical device, concretely relates to polarization maintaining magneto-optical attenuator.
Background
The polarization maintaining optical fiber transmits linearly polarized light and is widely applied to various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology, communication and the like. In an interference type optical fiber sensor based on optical coherent detection, the polarization maintaining optical fiber is used to ensure that the linear polarization direction is unchanged, and the coherent signal-to-noise ratio is improved, so that high-precision measurement of physical quantity is realized. The polarization maintaining fiber is used as a special fiber and widely applied to sensors such as fiber optic gyroscopes and fiber optic hydrophones and fiber optic communication systems such as DWDM and EDFA. In the polarization maintaining optical path, a polarization maintaining optical attenuator is a commonly used polarization maintaining device.
Common polarization-maintaining optical attenuators include mechanical polarization-maintaining optical attenuators, electro-optic polarization-maintaining optical attenuators, and micro-electro-mechanical system polarization-maintaining optical attenuators.
The mechanical polarization-maintaining optical attenuator has moving parts, and is slow in response speed and low in reliability and repeatability. The cost of the electro-optic crystal used by the electro-optic polarization-maintaining optical attenuator is high. MEMS polarization maintaining optical attenuators use MEMS chips that are susceptible to electrostatic breakdown.
The magneto-optical polarization-maintaining attenuator has no moving part, high reaction speed, low control voltage, simple structure and low raw material cost. The common magneto-optical attenuator generally uses the principle of changing the light path of polarized light under a magnetic field, thereby reducing the power and efficiency of a collimator to realize the transmission of the magnetic control light attenuation. The light path is complex, and the debugging difficulty is relatively high.
Disclosure of Invention
The technical problem to be solved in the utility model is to provide a polarization maintaining magneto-optical attenuator, realizes the transmission of magnetic control light attenuation volume.
The utility model discloses a realize like this:
a polarization-maintaining magneto-optical attenuator comprises a polarizing plate, a Faraday rotation crystal, a variable magnetic field applying mechanism for applying a variable magnetic field, and a polarization-maintaining double-fiber collimator for emitting and receiving optical signals;
the variable magnetic field applying mechanism is sleeved outside the Faraday rotary crystal, and the direction of the variable magnetic field applied by the variable magnetic field applying mechanism is parallel to a horizontal axis;
the polarization-maintaining dual-fiber collimator comprises: the optical fiber comprises a first optical fiber for inputting optical signals, a second optical fiber for outputting optical signals and a collimating lens; the collimating lens is disposed behind the exit end faces of the first and second optical fibers.
Further, the first optical fiber and the second optical fiber are arranged in parallel; the first optical fiber and the second optical fiber are both polarization maintaining optical fibers; the stress axes of the first and second optical fibers are parallel to each other.
Further, the polarization direction of the polarizer is perpendicular to the stress axis direction of the first optical fiber to which the optical signal is input.
Further, the faraday rotator is a faraday rotator having no magnetic field, and a reflective film layer is provided on the rear end surface of the faraday rotator as a mirror surface.
The utility model has the advantages that: the polarization direction of the light beam is changed through the magnetic field, and the polaroid in the light path absorbs the part of light which is inconsistent with the polarization direction of the light beam, so that the effect of directly weakening the light intensity is achieved. Compare with ordinary magneto-optical attenuator, the utility model discloses structure and light path are simpler, the debugging assembly of being convenient for, and material cost is also lower. Traditional light path decay implementation mode compares, the utility model discloses utilized the high characteristic of polarization maintaining light path system input signal light polarization degree, the characteristics of polaroid absorption and its polarization direction inconsistent polarized light. The structure of the light path is effectively simplified. The device has the characteristics of simple light path structure, small volume, no moving part, good reliability and repeatability, simple debugging and assembly, low material cost and the like.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, a polarization-maintaining magneto-optical attenuator includes a polarizing plate 201, a faraday rotator 202, a variable magnetic field applying mechanism 203 for applying a variable magnetic field, and a polarization-maintaining dual-fiber collimator 200 for emitting and receiving optical signals.
The polarization-maintaining dual-fiber collimator 200 includes: a first optical fiber 204 for optical signal input, a second optical fiber 205 for optical signal output, and a collimating lens 206; the first optical fiber 204 and the second optical fiber 205 are arranged in parallel, and both the first optical fiber 204 and the second optical fiber 205 are polarization maintaining fibers. The stress axes of the first optical fiber 204 and the second optical fiber 205 are parallel to each other. The collimating lens 206 is disposed behind the exit end faces of the first optical fiber 204 and the second optical fiber 205.
In a specific embodiment, the first optical fiber 204 and the second optical fiber 205 are disposed in parallel in the glass capillary 207, the collimating lens 206 is installed behind the exit end faces of the glass capillary 207, the first optical fiber 204 and the second optical fiber 205, so as to be connected as a whole as the dual-fiber collimator 200, and the collimating lens 206 is configured to collimate diverging light exiting from the first optical fiber 204 and converge the reflected collimated light onto the second optical fiber 205.
The variable magnetic field applying mechanism 203 is sleeved on the Faraday rotary crystal 202, and the direction of the variable magnetic field applied by the variable magnetic field applying mechanism 203 is parallel to the horizontal axis.
The variable magnetic field applying mechanism 203 is an induction coil 203. The strength of the magnetic field B can be controlled by controlling the amount of energization to the induction coil 203.
The faraday rotator 202 is a faraday rotator 202 having no magnetic field, and a reflective film layer 2021 is provided on the rear end surface of the faraday rotator 202 as a mirror surface, and functions as a mirror, for example, in a specific embodiment, a highly reflective film layer in the operating wavelength range is directly plated on the rear end surface of the faraday rotator 202 as a mirror surface.
The light beam 100 emitted from the first optical fiber 204 of the polarization-maintaining dual-fiber collimator 200 enters the polarizer 201, and because the polarization direction of the incident light beam 100 is parallel to the polarization direction of the polarizer 201, the polarized light beam 100 is not absorbed by the polarizer 201, and the light intensity is not changed. The incident light beam 100 is incident on the reflecting surface 2021 of the faraday rotator crystal 202.
When the induction coil 203 is not energized and the intensity of the magnetic field B is 0, the light beam 100 is reflected by the faraday rotator 202, and the polarization direction of the reflected light beam 110 is not changed and passes through the polarizer 201 again. Since the polarization direction of the reflected light beam 110 is parallel to the polarization direction of the polarizer 201, the polarized light beam 110 is not absorbed by the polarizer 201 and the light intensity is not changed. The reflected beam 110 is converged by the collimator lens 206 and received by the second optical fiber 205. Thereby realizing lossless optical transmission of optical signals from the incident port to the exit port.
When the induction coil 203 is energized, the intensity of the magnetic field B is increased, and after the polarized light beam 100 is reflected by the Faraday rotation crystal 202, the polarization direction of the reflected light beam 110 is deflected by more than 0 degrees and less than or equal to 90 degrees. When the reflected light beam 110 passes through the polarizing plate 201, since the polarization direction of the reflected light beam 110 is not parallel to the polarization direction of the polarizing plate 201, part of the reflected light beam 110 is absorbed by the polarizing plate 201, and the light intensity becomes weak. The reflected beam 110 is converged by the collimator lens 206 and received by the second optical fiber 205. Therefore, transmission of magnetic control light attenuation quantity of the optical signal from the incident port to the emergent port is realized.
The utility model discloses a magnetic field changes beam polarization direction, lets the polaroid absorption in the light path rather than the inconsistent that part light of polarization direction to reach the effect that directly weakens the light intensity. Compare with ordinary magneto-optical attenuator, the utility model discloses structure and light path are simpler, the debugging assembly of being convenient for, and material cost is also lower. Traditional light path decay implementation mode compares, the utility model discloses utilized the high characteristic of polarization maintaining light path system input signal light polarization degree, the characteristics of polaroid absorption and its polarization direction inconsistent polarized light. The structure of the light path is effectively simplified. The device has the characteristics of simple light path structure, small volume, no moving part, good reliability and repeatability, simple debugging and assembly, low material cost and the like.
Claims (4)
1. A polarization maintaining magneto-optical attenuator, characterized by: the polarization-maintaining double-fiber collimator comprises a polarizing plate, a Faraday rotation crystal, a variable magnetic field applying mechanism for applying a variable magnetic field, and a polarization-maintaining double-fiber collimator for transmitting and receiving optical signals;
the variable magnetic field applying mechanism is sleeved outside the Faraday rotary crystal, and the direction of the variable magnetic field applied by the variable magnetic field applying mechanism is parallel to a horizontal axis;
the polarization-maintaining dual-fiber collimator comprises: the optical fiber comprises a first optical fiber for inputting optical signals, a second optical fiber for outputting optical signals and a collimating lens; the collimating lens is disposed behind the exit end faces of the first and second optical fibers.
2. A polarization maintaining magneto-optical attenuator according to claim 1, wherein: the first optical fiber and the second optical fiber are arranged in parallel; the first optical fiber and the second optical fiber are both polarization maintaining optical fibers; the stress axes of the first and second optical fibers are parallel to each other.
3. A polarization maintaining magneto-optical attenuator according to claim 1, wherein: the polarization direction of the polaroid is perpendicular to the stress axis direction of the first optical fiber to which the optical signal is input.
4. A polarization maintaining magneto-optical attenuator according to claim 1, wherein: the Faraday rotary crystal is a Faraday rotary sheet without a magnetic field, and a reflecting film layer is arranged on the rear end face of the Faraday rotary sheet to be used as a reflecting mirror surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922359331.5U CN211653337U (en) | 2019-12-25 | 2019-12-25 | Polarization-maintaining magneto-optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922359331.5U CN211653337U (en) | 2019-12-25 | 2019-12-25 | Polarization-maintaining magneto-optical attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211653337U true CN211653337U (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922359331.5U Active CN211653337U (en) | 2019-12-25 | 2019-12-25 | Polarization-maintaining magneto-optical attenuator |
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| Country | Link |
|---|---|
| CN (1) | CN211653337U (en) |
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2019
- 2019-12-25 CN CN201922359331.5U patent/CN211653337U/en active Active
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