CN218383538U - Optical power stabilizing device for optical fiber light path - Google Patents
Optical power stabilizing device for optical fiber light path Download PDFInfo
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- CN218383538U CN218383538U CN202222600674.8U CN202222600674U CN218383538U CN 218383538 U CN218383538 U CN 218383538U CN 202222600674 U CN202222600674 U CN 202222600674U CN 218383538 U CN218383538 U CN 218383538U
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Abstract
The utility model discloses a light power stabilising arrangement for optic fibre light path belongs to optical engineering technical field, can solve current light power stabilising arrangement need have free light path part switching, and the great, the problem that needs accurate mechanical structure of whole structure volume. The device comprises: the light conduction unit is connected with the light source, the liquid crystal unit and the beam splitting unit by adopting transmission optical fibers; the light conduction unit is used for receiving the light beam emitted by the light source and conducting the light beam to the liquid crystal unit; the liquid crystal unit is used for carrying out intensity modulation on the light beam and reflecting the modulated light beam back to the light conduction unit; the light conduction unit is also used for conducting the modulated light beam to the beam splitting unit; the beam splitting unit is used for splitting the modulated light beam into a detection light beam and an output light beam; the regulating and controlling unit is used for receiving the detection light beam and generating a voltage regulating and controlling signal according to the detection light beam so as to control the modulated light power of the liquid crystal unit. The utility model is used for the luminous power of light source is stable.
Description
Technical Field
The utility model relates to an optical power stabilising arrangement for optic fibre light path belongs to optical engineering technical field.
Background
In sensing applications where the signal is sensed by modulating the optical power, a high quality, stable output power light source is key to improving the signal-to-noise ratio. In most cases, the intensity noise of the light source is a major component of the noise of the overall system. The kind and cause of noise of the light source are wide and vary depending on the material, the use condition, and the surrounding environment. It is difficult to specifically identify and eliminate each type of noise, and some intrinsic noise is inherent and cannot be eliminated. However, the optical power stabilizer solves this problem well: the attenuation of the optical path is dynamically adjusted by detecting the change of the light intensity (power), so that the output power of the optical path is kept stable. At present, an optical power stabilizer using an electro-optical material is well developed, but the existing optical power stabilizer is designed based on a free space optical path, light emitted by a light source is split by a spectroscope, one path of light is connected to a receiver for detecting power, and the other path of light passes through the electro-optical material for modulation and output. The device is very friendly to a free space optical path, but has a plurality of inconveniences for the application of an optical fiber optical path, and mainly comprises the following aspects: (1) The laser exit light needs to enter free space and be collimated, which creates inconvenience for the use of some lasers with fiber optic output. (2) light needs to be coupled into the fiber from the output of the stabilizer. And (3) the system has poor portability and poor sealing performance. The above problems directly affect the application scenario of optical fiber sensing.
In addition, some existing optical power stabilizers incorporate couplers and mechanical attenuators in the fiber-to-fiber interface to monitor and adjust optical power. But the device is greatly influenced by vibration and stress, has poor stability under relatively severe conditions, and has relatively large volume and mass and high cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a luminous power stabilising arrangement for optic fibre light path can solve current luminous power stabilising arrangement and need have free light path part switching, and the great, the problem that needs accurate mechanical structure of whole structure volume.
The utility model provides an optical power stabilising arrangement for optic fibre light path, include: the device comprises a light conduction unit, a liquid crystal unit, a beam splitting unit and a regulation and control unit; the light conduction unit is connected with the light source, the liquid crystal unit and the beam splitting unit by adopting transmission optical fibers;
the light conduction unit is used for receiving the light beam emitted by the light source and conducting the light beam to the liquid crystal unit;
the liquid crystal unit is used for carrying out intensity modulation on the light beam and reflecting the modulated light beam back to the light conduction unit;
the light conduction unit is also used for conducting the modulated light beam to the beam splitting unit;
the beam splitting unit is used for splitting the modulated light beam into a detection light beam and an output light beam;
the regulating and controlling unit is connected with the beam splitting unit by adopting a transmission optical fiber and is used for receiving the detection light beam and generating a voltage regulating and controlling signal according to the detection light beam so as to control the modulated light power of the liquid crystal unit.
Optionally, the regulation unit comprises:
a detector for receiving the probe beam and detecting an actual optical power of the probe beam;
and the controller is used for generating a voltage regulation and control signal according to the difference value of the actual optical power and the preset optical power so as to control the modulated optical power of the liquid crystal unit.
Optionally, the liquid crystal cell includes: the liquid crystal display device comprises a transparent conductive film, a reflector and a liquid crystal cell clamped between the transparent conductive film and the reflector;
the transparent conductive film is used for transmitting incident beams;
the liquid crystal cell is used for changing the polarization direction of an incident beam to obtain polarized light;
the reflector is used for reflecting the polarized light back to the liquid crystal cell again;
two ends of the liquid crystal cell are respectively connected with electrodes, and the electrodes are connected with the controller by adopting a lead; the controller is used for controlling the voltage on the electrode according to the voltage regulation and control signal.
Optionally, the liquid crystal cell further comprises a polarizer; the polaroid is attached to the surface, far away from the liquid crystal cell, of the transparent conductive film and used for converting incident light beams into linearly polarized light.
Optionally, the light conduction unit is a circulator.
Optionally, the transmission fiber is a polarization maintaining fiber.
Optionally, the transparent conductive film is an ITO film.
Optionally, the beam splitting unit is a beam splitter.
Optionally, the controller is a PID controller.
The utility model discloses the beneficial effect that can produce includes:
the utility model provides a light power stabilising arrangement for optic fibre light path, the device can be arranged in full optic fibre light path, need not at the free space switching. And the device has the advantages of small volume, low manufacturing cost, simple structure, no need of precise mechanical structure and the like. In addition, the transmission fiber in the device adopts a polarization-maintaining fiber, so that the incident light can be linearly polarized, circularly polarized or non-polarized, and linearly polarized light with a fixed angle can be obtained at the output.
Drawings
Fig. 1 is a schematic structural diagram of an optical power stabilizing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a liquid crystal cell according to an embodiment of the present invention.
List of parts and reference numerals:
10. a light source; 11. a light-conducting unit; 12. a liquid crystal cell; 121. a transparent conductive film; 122. a mirror; 123. a liquid crystal cell; 124. an electrode; 125. a polarizing plate; 13. a beam splitting unit; 14. a detector; 15. and a controller.
Detailed Description
The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples.
An embodiment of the utility model provides an optical power stabilising arrangement for optic fibre light path, as shown in fig. 1 and fig. 2, include: a light conduction unit 11, a liquid crystal unit 12, a beam splitting unit 13 and a regulation unit; the light conduction unit 11 is connected with the light source 10, the liquid crystal unit 12 and the beam splitting unit 13 by transmission optical fibers.
The light conduction unit 11 is used for receiving the light beam emitted by the light source 10 and conducting the light beam to the liquid crystal unit 12.
Wherein the light conducting unit 11 may be a circulator. The circulator has three ports connected to the light source 10, the liquid crystal cell 12, and the beam splitting unit 13, respectively.
The liquid crystal cell 12 is used for intensity modulation of the light beam and reflecting the modulated light beam back to the light conducting cell 11.
The light conducting unit 11 is also used for conducting the modulated light beam to the beam splitting unit 13.
The light beam emitted from the light source 10 enters the circulator and is conducted to the liquid crystal unit 12, the intensity of the light beam modulated by the liquid crystal unit 12 is reflected back to the circulator, and then the light beam is emitted into the beam splitting unit 13 by the circulator.
The beam splitting unit 13 is used for splitting the modulated light beam into a probe light beam and an output light beam. In practical applications, the beam splitting unit 13 may be a beam splitter.
The regulating unit is connected with the beam splitting unit 13 by a transmission optical fiber, and is configured to receive the probe beam and generate a voltage regulating signal according to the probe beam, so as to control the modulated optical power of the liquid crystal unit 12.
Wherein, the regulation and control unit comprises:
and a detector 14 for receiving the probe beam and detecting the actual optical power of the probe beam. The detector 14 may be a photodetector of the prior art.
And a controller 15, configured to generate a voltage regulation signal according to a difference between the actual optical power and a preset optical power, so as to control the modulated optical power of the liquid crystal cell 12. Wherein, predetermine luminous power for the power value that sets up in advance, technical staff in the field can set for according to actual conditions, the embodiment of the utility model provides a do not limit this. The embodiment of the present invention does not limit the type of the controller 15, and in practical applications, the controller 15 can select a PID (proportional-integral-derivative) controller.
The beam splitter divides the modulated light beam into two paths, one path outputs light with stable power, the other path is connected to the detector 14, a signal detected by the detector 14 is transmitted into the controller 15, the controller 15 compares the difference between the preset light power and the actual light power, and an output voltage regulation signal is calculated to control the liquid crystal unit 12 to modulate the light power. Finally, the whole system forms a negative feedback system.
Further, as shown in fig. 2, the liquid crystal cell 12 includes: a transparent conductive film 121, a mirror 122, and a liquid crystal cell 123 sandwiched between the transparent conductive film 121 and the mirror 122.
The transparent conductive film 121 transmits an incident beam; in an embodiment of the present invention, the transparent conductive film 121 may be an ITO (Indium Tin Oxide) film.
The liquid crystal cell 123 is used for changing the polarization direction of the incident beam to obtain polarized light.
The mirror 122 is used to reflect the polarized light back to the liquid crystal cell 123 again.
Two ends of the liquid crystal cell 123 are respectively connected with electrodes 124, and the electrodes 124 are connected with the controller 15 by adopting conducting wires; the controller 15 is configured to control the voltage on the electrode 124 according to the voltage regulation signal.
In practical applications, the liquid crystal cell 12 may further include a polarizer 125; a polarizer 125 is attached to the surface of the transparent conductive film 121 remote from the liquid crystal cell 123 for converting incident light beams into linearly polarized light.
Referring to fig. 2, the light beam is transmitted to the liquid crystal cell 12 through the transmission fiber, specifically, first, after diffraction, passes through the transparent ITO with the polarizer 125, and enters the liquid crystal cell 123, where the transmitted light is converted into linearly polarized light and keeps the same with the polarization angle of the polarizer 125. The liquid crystal in the liquid crystal cell 123 is deflected by different angles according to the voltage applied across the electrodes 124, thereby changing the polarization direction of the polarized light. The polarized light reflected by the mirror 122 is rotated by the liquid crystal again and emitted from the same path, and when passing through the polarizer 125 again, the attenuation of the optical power is different according to the difference of the polarization angle change. In summary, the optical power of the light beam can be modulated by varying the voltage applied across the electrodes 124, and the emitted light can be kept at a fixed polarization.
The embodiment of the utility model provides an in transmission fiber can choose polarization maintaining fiber for use, and the incident light can be any kind in linear polarization, circular polarization or the non-polarization like this, and the output can all obtain the linear polarization light of fixed angle this moment.
It should be noted that, if the transmission fiber is a polarization maintaining fiber, the polarizer 125 may be eliminated from the structure of the liquid crystal cell 12; if the transmission fiber is a common fiber, the polarizer 125 may be retained in the structure of the liquid crystal cell 12.
In the embodiment of the present invention, the liquid crystal unit 12 is used as an actuator to modulate the optical power according to the instruction of the controller 15. The controller 15, as a core device, can calculate a voltage regulation signal for driving the liquid crystal cell 12 according to the power information and the variation thereof received by the detector 14. At this time, the entire system constitutes a feedback network.
The utility model provides a luminous power stabilising arrangement for optic fibre light path, the device can be arranged in the all-fiber light path, need not at the free space switching. And the device has the advantages of small volume, low manufacturing cost, simple structure, no need of precise mechanical structure and the like. In addition, the transmission fiber in the device adopts a polarization-maintaining fiber, so that the incident light can be linearly polarized, circularly polarized or non-polarized, and linearly polarized light with a fixed angle can be obtained at the output.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (9)
1. An optical power stabilizing apparatus for an optical fiber circuit, comprising: the device comprises a light conduction unit, a liquid crystal unit, a beam splitting unit and a regulation and control unit; the light conduction unit is connected with the light source, the liquid crystal unit and the beam splitting unit by adopting transmission optical fibers;
the light conduction unit is used for receiving the light beam emitted by the light source and conducting the light beam to the liquid crystal unit;
the liquid crystal unit is used for carrying out intensity modulation on the light beam and reflecting the modulated light beam back to the light conduction unit;
the light conduction unit is also used for conducting the modulated light beam to the beam splitting unit;
the beam splitting unit is used for splitting the modulated light beam into a detection light beam and an output light beam;
the regulating and controlling unit is connected with the beam splitting unit by adopting a transmission optical fiber and is used for receiving the detection light beam and generating a voltage regulating and controlling signal according to the detection light beam so as to control the modulated light power of the liquid crystal unit.
2. The optical power stabilizing apparatus of claim 1, wherein the regulating unit comprises:
a detector for receiving the probe beam and detecting an actual optical power of the probe beam;
and the controller is used for generating a voltage regulation and control signal according to the difference value of the actual optical power and the preset optical power so as to control the modulated optical power of the liquid crystal unit.
3. The optical power stabilizing apparatus of claim 2, wherein the liquid crystal cell comprises: the liquid crystal display device comprises a transparent conductive film, a reflector and a liquid crystal cell clamped between the transparent conductive film and the reflector;
the transparent conductive film is used for transmitting incident beams;
the liquid crystal cell is used for changing the polarization direction of an incident beam to obtain polarized light;
the reflector is used for reflecting the polarized light back to the liquid crystal cell again;
two ends of the liquid crystal cell are respectively connected with electrodes, and the electrodes are connected with the controller by adopting a lead; the controller is used for controlling the voltage on the electrode according to the voltage regulation and control signal.
4. The optical power stabilization device of claim 3, wherein the liquid crystal cell further comprises a polarizer; the polaroid is attached to the surface, far away from the liquid crystal cell, of the transparent conductive film and used for converting incident light beams into linearly polarized light.
5. The optical power stabilization device of claim 1, wherein the light conduction unit is a circulator.
6. An optical power stabilizing device according to any one of claims 1 to 3, wherein said transmission fiber is a polarization maintaining fiber.
7. An optical power stabilizing device according to claim 3 or 4, wherein said transparent conductive film is an ITO film.
8. The optical power stabilization device of claim 1, wherein the beam splitting unit is a beam splitter.
9. The optical power stabilizer according to claim 2, wherein the controller is a PID controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222600674.8U CN218383538U (en) | 2022-09-30 | 2022-09-30 | Optical power stabilizing device for optical fiber light path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222600674.8U CN218383538U (en) | 2022-09-30 | 2022-09-30 | Optical power stabilizing device for optical fiber light path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218383538U true CN218383538U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222600674.8U Active CN218383538U (en) | 2022-09-30 | 2022-09-30 | Optical power stabilizing device for optical fiber light path |
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| Country | Link |
|---|---|
| CN (1) | CN218383538U (en) |
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2022
- 2022-09-30 CN CN202222600674.8U patent/CN218383538U/en active Active
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