CN203101764U - Device realizing optical polarized rotation by reflection method - Google Patents
Device realizing optical polarized rotation by reflection method Download PDFInfo
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- CN203101764U CN203101764U CN 201220696260 CN201220696260U CN203101764U CN 203101764 U CN203101764 U CN 203101764U CN 201220696260 CN201220696260 CN 201220696260 CN 201220696260 U CN201220696260 U CN 201220696260U CN 203101764 U CN203101764 U CN 203101764U
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Abstract
The utility model discloses a device realizing optical polarized rotation by the reflection method. The device comprises an optical signal input-output component, an optical rotation component and an optical reflection component which are sequentially arranged along the transmission direction of incident light, and the optical reflection component performs total reflection to the incident light of the optical rotation component and enables reflected light to return along an incident light way to pass the optical rotation component again. The device realizing optical polarized rotation by the reflection method is compact in optical structure, small in size, stable in performance, low in cost and quite suitable for popularization and application.
Description
Technical field
The utility model relates to sensory field of optic fibre, particularly relates to a kind of device that utilizes reflectometry to realize the polarization state rotation.
Background technology
Along with the mankind to the going deep into of space understanding, space exploration to become more meticulous, variation and synthesization development.The survey plan that many detection projects are many, the cycle is long, funds intensity is big needs better detection means, for the requirement of technological innovation than higher.
The principle of work of Fibre Optical Sensor be with light as signal vehicle, and transmit signal by optical fiber.Because optical fiber has good biography optical property, extremely low to the loss of light, the non-constant width of the frequency band of optical signal transmission fiber, and optical fiber itself in addition is exactly a kind of sensitive element, so Fibre Optical Sensor has many other traditional sensors excellent characteristic can't be obtained.
The polarization state rotary device is the necessary component of Fibre Optical Sensor.At present, the technology of existing realization polarization state rotation mainly is two kinds of transmission-type and quarter wave plate 14 formulas.Wherein, transmission-type, for signal input module and signal component output are distributed in the structure at the two ends of optically-active assembly, its volume is bigger, because the signal vehicle difference makes signal monitoring stable inadequately; The quarter wave plate 14 formula, for the principle of utilizing the phase delay wave plate realizes the polarization state rotation, complex structure and cost are higher.
The utility model content
Based on this, be necessary defective and deficiency at prior art, provide that a kind of optical texture is succinct, volume is little, the device of stable performance, realization polarization state rotation that cost is low.
The device that utilizes the rotation of reflectometry realization polarization state for realizing that the utility model purpose provides comprises the optically-active assembly, it is characterized in that, also comprises the light reflection subassembly;
Described optically-active assembly and described smooth reflection subassembly set gradually along the incident light direction of propagation;
Described optically-active assembly carries out the rotation of polarization state to the reflected light of incident light and the described smooth reflection subassembly reflection of process;
Described smooth reflection subassembly carries out total reflection to the incident light by described optically-active assembly, and reflected light is returned along input path, once more by described optically-active assembly.
Among embodiment, the device of described realization polarization state rotation also comprises the light signal in-out box therein;
Described light signal in-out box and described optically-active assembly, described smooth reflection subassembly set gradually along the incident light direction of propagation, provide incident light to described optically-active assembly, and finish receiving the postrotational reflected light of polarization state.
Among embodiment, described light signal in-out box comprises an optical lens and a single fiber head therein;
Described optical lens is arranged between described single fiber head and the described optically-active assembly, and incident light is collimated, and reflected light is converged.
Among embodiment, described single fiber head comprises an optical fiber and a pore glass tube therein, and described optical fiber is passed by described pore glass tube center, forms light exit side and light incident side;
Described light exit side and described light incident side are same port.
Among embodiment, described optically-active assembly comprises a magnet ring and a Faraday crystal therein;
Described Faraday crystal is embedded in the described magnet ring, and described magnet ring provides the stationary magnetic field for described Faraday crystal;
Described Faraday crystal carries out the polarization state rotation to incident light with through the reflected light that described smooth reflection subassembly reflects.
Among embodiment, described smooth reflection subassembly comprises the catoptron of a plating total reflection film therein;
Finish the incident light that polarization state rotates for the first time by described optically-active assembly and carry out total reflection by described catoptron, reflected light overlaps with optical path of incident light.
Therein among embodiment, the focus of described optical lens is positioned on the end face of light exit side of described single fiber head.
The beneficial effects of the utility model: the utility model utilizes reflectometry to realize the device of polarization state rotation, by the light reflection subassembly is set, feasible light wave by the incident of light signal in-out box, after through the optically-active assembly, reflect by the light reflection subassembly again, pass through described optically-active assembly once more, one positive one is contrary with twice optically-active effect stack, finally exports from same light signal in-out box.Utilize this structure, can realize optically-active angle commonly used, comprise the manufacturing of the polarization apparatus that is not limited to 45 degree, 90 degree etc., its optical texture is succinct, volume is little, cost is low; And, owing in same optical fiber, transmit, can not cause the light-wave energy generation amplification or the range of decrease owing under different external environment influences, producing interference, stable performance is highly suitable for promotion and application.
Description of drawings
Fig. 1 realizes the one-piece construction synoptic diagram of an embodiment of device of polarization state rotation for the utility model utilizes reflectometry;
Fig. 2 a and 2b are the functional status synoptic diagram of embodiment as shown in Figure 1;
Fig. 3 moves towards the view of synoptic diagram and polarization state rotation for embodiment light path as shown in Figure 1.
Embodiment
An embodiment who utilizes reflectometry to realize the device of polarization state rotation of the present utility model, extremely shown in Figure 3 as Fig. 1.
The utility model utilizes reflectometry to realize the device of polarization state rotation, comprises optically-active assembly 200, also comprises light reflection subassembly 300;
Described optically-active assembly 200 and described smooth reflection subassembly 300 set gradually along the incident light direction of propagation;
200 pairs of incident lights of described optically-active assembly and the reflected light that reflects through described smooth reflection subassembly 300 carry out the rotation of polarization state;
300 pairs of incident lights by described optically-active assembly 200 of described smooth reflection subassembly carry out total reflection, and reflected light is returned along input path, once more by described optically-active assembly 200.
Incident light is finished the rotation first time of polarization state at first by described optically-active assembly 200; The light wave that carries the different polarization states component after the described optically-active assembly 200 of the process of 300 pairs of incidents of described smooth reflection subassembly is handled carries out total reflection, and make it keep postrotational polarization state for the first time, return along input path, by described optically-active assembly 200, finish the rotation second time of polarization state once more.Be equivalent to utilize one group of optically-active assembly that twice stack carried out in the rotation of polarization state, can realize optically-active angle commonly used, comprise the manufacturing of the polarization apparatus that is not limited to 45 degree, 90 degree etc., simple for structure, volume is little, practical.
Preferably, as an embodiment, the device of described realization polarization state rotation also comprises light signal in-out box 100;
Described light signal in-out box 100 and described optically-active assembly 200, described smooth reflection subassembly 300 set gradually along the incident light direction of propagation, provide incident light to described optically-active assembly 200, and finish receiving the postrotational reflected light of polarization state.
Because incident light in the different light paths and emergent light can produce interference under extraneous environmental impact, make the light-wave energy generation amplification or the range of decrease, polarization state also can random fluctuation, causes the pilot signal instability.Incident light and emergent light transmit in same in-out box, have reduced the influence of interference effect and external environment condition variation to polarization state, thereby make the device usability stable more, reliable.
Preferably, as an embodiment, described light signal in-out box 100 comprises an optical lens 120 and a single fiber head;
Described optical lens 120 is arranged between described single fiber head and the described optically-active assembly 200, and incident light is collimated, and reflected light is converged.
Preferably, as an embodiment, described single fiber head comprises an optical fiber 111 and a pore glass tube 112, and described optical fiber 111 is passed by described pore glass tube 112 centers, forms light exit side and light incident side;
Described light exit side and described light incident side are same port.
Carry out 8 grinding and polishings and the PROCESS FOR TREATMENT of plating of spending angles at described light exit side and light incident side, guarantee that the described optical fiber 111 that passes through of luminous energy least disadvantage enters device inside greater than the anti-reflection film of 99% transmitance.
Preferably, as an embodiment, described optically-active assembly 200 comprises a magnet ring 210 and a Faraday crystal 2 20;
Described Faraday crystal 2 20 is embedded in the described magnet ring 210, and described magnet ring provides the stationary magnetic field for described Faraday crystal 2 20;
20 pairs of incident lights of described Faraday crystal 2 and the reflected light that reflects through described smooth reflection subassembly 300 carry out the polarization state rotation.
Because the characteristic of optically-active assembly itself, promptly its optical direction only changes with the change of the size and Orientation that is attached to the magnetic field on it, and the magnet ring that herein is provided with is a permanent-magnetic clamp, and the size and Orientation in magnetic field can not change basically.
Illustrate, as shown in Figure 2:
Incident light passes through described optically-active assembly for the first time, the polarization state anglec of rotation is ω, then through light reflection subassembly reflection output, once more by described optically-active assembly, again along same direction rotation ω, the angle of twice polarization state rotation is identical, and is last on anglec of rotation ω before for the polarization state anglec of rotation, the outgoing polarization state of light has been rotated 2 ω with respect to incident light, promptly utilizes one group of optically-active assembly to realize 2 times optically-active angle.
Can adjust and then obtain different optically-active angles to the design of described optically-active assembly as required.
Preferably, as an embodiment, described smooth reflection subassembly 300 comprises the catoptron of a plating total reflection film;
Finish the incident light that polarization state rotates for the first time by described optically-active assembly 200 and impinge perpendicularly on described mirror surface, described catoptron carries out total reflection to it, and reflected light is returned along optical path of incident light, and does not change the polarization state feature of incident light itself.
Preferably, as an embodiment, the focus of described optical lens 120 is positioned on the end face of light exit side of described single fiber head;
Incident light is injected described gyrotropi crystal 200 from the focus incident of described optical lens 120 through becoming directional light behind the described optical lens 120, carries out polarization state and rotates for the first time; Directional light incidence reflection mirror afterwards, after total reflection takes place, continuation keeping parallelism light carries out polarization state by described gyrotropi crystal 200 and rotates for the second time, converge to the focus place of described lens by the directional light of described optical lens 120, and light exit side, return described light signal in-out box 100 once more.
To realize that 90 degree optically-actives are example, describe below, as shown in Figure 3:
The S attitude of input light and output light represents that with solid line the P attitude dots (S attitude, P attitude refer to the polarisation of light component, and both are vertical mutually on direction of vibration);
Light signal in-out box 100, optically-active assembly 200 and light reflection subassembly 300 set gradually along input path;
Described light signal in-out box 100 is by optical fiber (type is healthy and free from worry smf-28e single-mode fiber) 111 and pore glass tube 112, and focal length is optical lens 120 compositions of 1.92mm, described optical lens 120 is arranged between the light exit side of optically-active assembly 200 and described optical fiber 111 along light path, and the focus of described optical lens 120 is positioned on the end face of light exit side of described optical fiber 111; The diverging light of being imported by the light exit side of described optical fiber 111 becomes the described optically-active assembly of directional light (Gaussian beam) incident by described optical lens 120;
Described optically-active assembly is that the 45 Faraday crystal 2s 20 of spending (supposing 45 degree that turn clockwise here) are formed by magnet ring (stationary magnetic field is provided) and unidirectional rotation angle; Along the gyrotropi crystal 220 in the described optically-active assembly 200 of directional light incident of light path propagation, this moment is because the effect of the Faraday effect of gyrotropi crystal 220, makes the polarization state of S attitude by the light of described gyrotropi crystal, P attitude 45 degree (setting of the magnetic direction in this example and the design of gyrotropi crystal make it according to clockwise 45 degree optically-actives) that all turned clockwise;
Described smooth reflection subassembly 300 is made of a catoptron that has plated high reflectance (general reflectivity is greater than 99%) film, and described catoptron is provided with along input path and perpendicular to the light incident direction; The incident light of finishing the rotation of polarization state 45 degree impinges perpendicularly on the light reflection subassembly 300 and total reflection takes place, reflected light is according to original optical path and keep former polarization state to reflect, pass through gyrotropi crystal 200 once more, the polarization of reflected light attitude is still according to equidirectional rotation 45 degree;
At last, finish twice light signal after the polarization state conversion by described optical lens 120, focus on the focus place of described optical lens 120, by the single fiber head output that described optical fiber 111 and described pore glass tube 112 are formed, the polarization state of output light signal is compared with S attitude, the P attitude of incident optical signal and has been rotated 90 degree.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (7)
1. a device that utilizes reflectometry to realize the polarization state rotation comprises the optically-active assembly, it is characterized in that, also comprises the light reflection subassembly;
Described optically-active assembly and described smooth reflection subassembly set gradually along the incident light direction of propagation;
Described optically-active assembly carries out the rotation of polarization state to the reflected light of incident light and the described smooth reflection subassembly reflection of process;
Described smooth reflection subassembly carries out total reflection to the incident light by described optically-active assembly, and reflected light is returned along input path, once more by described optically-active assembly.
2. the device of realization polarization state rotation according to claim 1 is characterized in that, also comprises the light signal in-out box;
Described light signal in-out box and described optically-active assembly, described smooth reflection subassembly set gradually along the incident light direction of propagation, provide incident light to described optically-active assembly, and finish receiving the postrotational reflected light of polarization state.
3. the device of realization polarization state rotation according to claim 2 is characterized in that described light signal in-out box comprises an optical lens and a single fiber head;
Described optical lens is arranged between described single fiber head and the described optically-active assembly, and incident light is collimated, and reflected light is converged.
4. the device of realization polarization state rotation according to claim 3 is characterized in that described single fiber head comprises an optical fiber and a pore glass tube, and described optical fiber is passed by described pore glass tube center, forms light exit side and light incident side;
Described light exit side and described light incident side are same port.
5. according to the device of each described realization polarization state rotation of claim 1 to 4, it is characterized in that described optically-active assembly comprises a magnet ring and a Faraday crystal;
Described Faraday crystal is embedded in the described magnet ring, and described magnet ring provides the stationary magnetic field for described Faraday crystal;
Described Faraday crystal carries out the polarization state rotation to incident light with through the reflected light that described smooth reflection subassembly reflects.
6. according to the device of each described realization polarization state rotation of claim 1 to 4, it is characterized in that described smooth reflection subassembly comprises the catoptron of a plating total reflection film;
Finish the incident light that polarization state rotates for the first time by described optically-active assembly and carry out total reflection by described catoptron, reflected light overlaps with optical path of incident light.
7. the device of realization polarization state according to claim 4 rotation is characterized in that, the focus of described optical lens is positioned on the end face of light exit side of described single fiber head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220696260 CN203101764U (en) | 2012-12-14 | 2012-12-14 | Device realizing optical polarized rotation by reflection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220696260 CN203101764U (en) | 2012-12-14 | 2012-12-14 | Device realizing optical polarized rotation by reflection method |
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| CN203101764U true CN203101764U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220696260 Expired - Fee Related CN203101764U (en) | 2012-12-14 | 2012-12-14 | Device realizing optical polarized rotation by reflection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869506A (en) * | 2012-12-14 | 2014-06-18 | 招远招金光电子科技有限公司 | Device and method for achieving light polarization state rotation by utilizing reflection method |
-
2012
- 2012-12-14 CN CN 201220696260 patent/CN203101764U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869506A (en) * | 2012-12-14 | 2014-06-18 | 招远招金光电子科技有限公司 | Device and method for achieving light polarization state rotation by utilizing reflection method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20161214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |