CN113031172A - Method for anti-reflection and effectively adjusting energy entering optical fiber and optical module - Google Patents
Method for anti-reflection and effectively adjusting energy entering optical fiber and optical module Download PDFInfo
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- CN113031172A CN113031172A CN202110197586.5A CN202110197586A CN113031172A CN 113031172 A CN113031172 A CN 113031172A CN 202110197586 A CN202110197586 A CN 202110197586A CN 113031172 A CN113031172 A CN 113031172A
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- optical fiber
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- polarizer
- light
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 title abstract description 22
- 230000010287 polarization Effects 0.000 claims abstract description 19
- 239000004065 semiconductor Substances 0.000 claims abstract description 15
- 238000002834 transmittance Methods 0.000 claims abstract description 6
- 241000220225 Malus Species 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 230000031700 light absorption Effects 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 230000003667 anti-reflective effect Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4213—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being polarisation selective optical elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0064—Anti-reflection devices, e.g. optical isolaters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
Abstract
The invention relates to the technical field of optical communication, in particular to a method and a system for anti-reflection and effectively adjusting the energy entering an optical fiber, which comprises the following steps: the semiconductor laser emits incident laser, and the incident laser sequentially passes through the lens and the polaroid and then enters the optical fiber; adjusting the tilt angle of the polarizer to mitigate near end reflections and far end reflections; rotating the polaroid around the central axis of the polaroid to adjust the energy entering the optical fiber by adjusting the light transmittance; the polaroid is arranged at the front end of the incidence of the optical fiber, and the polarized light is obtained after the light emitted by the laser passes through the polarizing film in the polaroid. The scheme can effectively adjust the energy entering the optical fiber and change the polarization state of the returning light, so that the polarization state of the returning laser light is different from the original polarization state, the influence on the laser is reduced, and the working stability of the device is improved; the polarizing film is made of a material with better cost performance, so that the cost of the optical fiber assembly is reduced.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a method for preventing reflection and effectively adjusting the energy entering an optical fiber and an optical module.
Background
Most optical communication devices perform conversion between electrical signals and optical signals through an optical transceiver module, perform connection to an optical fiber as a transmission medium, and select and provide an optical transceiver compatible with an environmental medium (e.g., a communication rate, a communication distance, and a transmission medium) to the communication device when operating the communication device.
Generally, first, light emitted from a laser of a light emitting module is reflected at a far end, and a semiconductor laser is very sensitive to reflection, which causes unstable performance of the semiconductor laser, so that an anti-reflection process is required between the semiconductor laser and an optical fiber. Then, the energy emitted by the semiconductor laser is too large, and the problem of poor effect of the device at the module testing end cannot be fundamentally solved by adopting a common defocusing means. The method has the following defects:
1. the semiconductor laser is very sensitive to the reflected light, and the light emitted by the laser is reflected at the far end to return parallel light, so that the normal operation of the device is greatly influenced.
2. The isolator is arranged in front of the optical fiber, so that the performance is good and the price is high.
3. The normal device can reach the normal power range only by defocusing, but the light spots converged after coupling are not concentrated, so that the module testing effect is poor.
Therefore, how to further research and explore the anti-reflection and effectively adjust the amount of energy entering the optical fiber to ensure the normal and stable operation of the optoelectronic device is the direction of research and exploration in the related field.
Disclosure of Invention
The invention provides a method for preventing reflection and effectively adjusting the energy entering an optical fiber and an optical module, which solve the technical problem of poor eye pattern effect of the optical communication device during testing.
The present invention provides a method for anti-reflection and effectively adjusting the amount of energy entering an optical fiber, which comprises the following steps:
the semiconductor laser emits incident laser, and the incident laser sequentially passes through the lens and the polaroid and then enters the optical fiber;
adjusting the tilt angle of the polarizer to mitigate near end reflections and far end reflections;
rotating the polaroid around the central axis of the polaroid to adjust the energy entering the optical fiber by adjusting the light transmittance;
the polaroid is arranged at the front end of the incidence of the optical fiber, and the polarized light is obtained after the light emitted by the laser passes through the polarizing film in the polaroid.
Optionally, the polarizer angle is adjusted so that the reflected principal ray of the incident laser light striking the surface of the polarizer is redirected by the polarizer and the energy not returned to the laser is attenuated.
Optionally, the polarization direction is adjusted according to the Malus law of absorption of light by the polarizer to adjust the amount of energy entering the fiber.
Optionally, the inclination angle is an included angle between a central axis of the polarizer and the incident laser direction, and the included angle is 0-45 °.
The invention also provides an anti-reflection optical module capable of effectively adjusting the energy entering the optical fiber, which comprises a semiconductor laser for emitting incident laser, a lens, a polaroid and the optical fiber which are sequentially arranged along the path of the incident laser, wherein the included angle between the central axis of the polaroid and the direction of the incident laser can be adjusted.
Alternatively, the polarizer is made of glass or silicon or plastic.
Optionally, the included angle is 0 to 45 degrees.
Optionally, the polarizer is a polyvinyl alcohol film.
Has the advantages that: the invention provides a method for anti-reflection and effectively adjusting the energy entering an optical fiber and an optical module, comprising the following steps: the semiconductor laser emits incident laser, and the incident laser sequentially passes through the lens and the polaroid and then enters the optical fiber; adjusting the tilt angle of the polarizer to mitigate near end reflections and far end reflections; rotating the polaroid around the central axis of the polaroid to adjust the energy entering the optical fiber by adjusting the light transmittance; the polaroid is arranged at the front end of the incidence of the optical fiber, and the polarized light is obtained after the light emitted by the laser passes through the polarizing film in the polaroid. The scheme can effectively adjust the energy entering the optical fiber and change the polarization state of the returning light, so that the polarization state of the returning laser light is different from the original polarization state, the influence on the laser is reduced, and the working stability of the device is improved; the polarizing film is made of a material with better cost performance, so that the cost of the optical fiber assembly is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of the method of the present invention for anti-reflection and effectively modulating the amount of energy entering an optical fiber;
FIG. 2 is a schematic flow chart of a method of the present invention for anti-reflection and efficient conditioning of incoming optical fibers;
fig. 3 is a schematic diagram of the optical path of an optical module for anti-reflection and effective adjustment of incoming optical fibers according to the present invention.
Description of reference numerals: the laser comprises a semiconductor laser 1, a lens 2, a polaroid 3 and an optical fiber 4.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 3, the present invention provides a method for anti-reflection and effectively adjusting the amount of energy entering an optical fiber, comprising:
the semiconductor laser 1 emits incident laser, and the incident laser sequentially passes through the lens 2 and the polaroid 3 and then enters the optical fiber 4;
the inclination angle of the polarizer 3 is adjusted to mitigate the near-end reflection and the far-end reflection;
rotating the polaroid 3 around the central axis of the polaroid 3 to adjust the energy entering the optical fiber 4 by adjusting the light transmittance;
the polaroid 3 is arranged at the incident front end of the optical fiber 4, and the light emitted by the laser passes through the polarization film in the polaroid 3 to obtain polarized light.
The method comprises the following specific steps: by disposing the polarizer 3 at the front end of the optical fiber 4, the polarizing film (i.e. PVA film) inside the polarizer 3 is stretched in the optical direction to have strong anisotropy with different properties in the two directions of vertical and horizontal directions like a fence, and the dye molecules adsorbed by the macromolecular bonds form so-called dichroism with large difference in absorption properties for light vibration in the two directions of vertical and horizontal directions, that is, the vibration energy of light along the macromolecular bonds is absorbed completely and does not pass through, while the vibration energy perpendicular to the macromolecular bonds is not absorbed and passes through smoothly, which is a characteristic of strong selective absorption for the polarization direction of light, and only polarized light is left after natural light passes through the polarizing film. Polarized light passes through the polarization mode and is either passed or absorbed by the polarization direction.
Alternatively, the angle of the polarizer 3 is adjusted so that the reflected principal ray of the incident laser light striking the surface of the polarizer 3 is redirected by the polarizer 3 and the energy that cannot return to the laser is attenuated. The polarization direction is adjusted according to the Malus law of light absorption by the polarizer 3 to adjust the amount of energy entering the fiber 4.
Alternatively, the optical absorption by the polarizer 3 may be based on the Malus law I' ═ Icos2Alpha to adjust the polarization direction to adjust the amount of energy entering the fiber 4. Malus' law states that: linearly polarized light having intensity I (o) is transmitted through the analyzer, and the intensity of transmitted light (without taking absorption into consideration) is I ═ I (o) cos2Theta. θ is an angle between the light vibration direction of the incident linearly polarized light and the polarization direction of the polarizing plate 3.
Specifically, a polarizer 3 is disposed between the laser of the light emitting assembly and the optical fiber 4 for changing the optical path of the light reflected back to the laser, thereby reducing the energy returned to the laser. The material of the polaroid 3 can be glass, silicon or plastic, and the polaroid 3 is obliquely arranged, and the inclination angle is 0-45 degrees. When in use, the light source is adjusted according to the transmission and reflection principles of light according to specific conditions.
As shown in fig. 1 to 3, an optical module for antireflection and effectively adjusting the amount of energy entering an optical fiber 4 is further provided in an embodiment of the present invention, and includes a semiconductor laser 1 for emitting incident laser light, and further includes a lens 2, a polarizer 3, and an optical fiber 4 sequentially arranged along a path of the incident laser light, and an included angle between a central axis of the polarizer 3 and a direction of the incident laser light is adjustable.
1. The polarizing plate 3 is disposed at the front end of the optical fiber 4.
2. The maximum energy value entering the optical fiber 4 is adjusted according to the Malus law I' ═ Icos of the light absorption of the polarizer 32The alpha polarization direction can effectively adjust the energy of the entering optical fiber 4 to be largeIs small.
A polarizer 3 is arranged between the laser of the light emitting assembly and the optical fiber 4 for altering the optical path of the light reflected back to the laser, thereby reducing the energy returned to the laser. The material of the polaroid 3 can be glass, silicon or plastic, and the polaroid 3 is obliquely arranged, and the inclination angle is 0-45 degrees. When in use, the light source is adjusted according to the transmission and reflection principles of light according to specific conditions.
Has the advantages that: the invention provides a method for anti-reflection and effectively adjusting the energy entering an optical fiber and an optical module, comprising the following steps: the semiconductor laser emits incident laser, and the incident laser sequentially passes through the lens and the polaroid and then enters the optical fiber; adjusting the tilt angle of the polarizer to mitigate near end reflections and far end reflections; rotating the polaroid around the central axis of the polaroid to adjust the energy entering the optical fiber by adjusting the light transmittance; the polaroid is arranged at the front end of the incidence of the optical fiber, and the polarized light is obtained after macromolecules in the optical signal pass through the polarizing film in the polaroid. The scheme can effectively adjust the energy entering the optical fiber and change the polarization state of the returning light, so that the polarization state of the returning laser light is different from the original polarization state, the influence on the laser is reduced, and the working stability of the device is improved; the polarizing film is made of a material with better cost performance, so that the cost of the optical fiber assembly is reduced.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (8)
1. A method of antireflective and efficiently modulating the amount of energy entering an optical fiber, comprising:
the semiconductor laser emits incident laser, and the incident laser sequentially passes through the lens and the polaroid and then enters the optical fiber;
adjusting the tilt angle of the polarizer to mitigate near end reflections and far end reflections;
rotating the polaroid around the central axis of the polaroid to adjust the energy entering the optical fiber by adjusting the light transmittance;
the polaroid is arranged at the front end of the incidence of the optical fiber, and the polarized light is obtained after the light emitted by the laser passes through the polarizing film in the polaroid.
2. A method of antireflection and efficiently adjusting the amount of energy that enters an optical fiber as claimed in claim 1, wherein the polarizer angle is adjusted so that the principal ray of reflection of the incident laser light striking the surface of the polarizer is redirected by the polarizer, and the energy and angle of the returning laser is attenuated so that it reduces the effect on the laser.
3. The method of claim 1, wherein the amount of energy entering the fiber is adjusted by adjusting the polarization direction according to the Malus law of absorption of light by the polarizer.
4. The method of claim 1, wherein the tilt angle is an angle between a central axis of the polarizer and a direction of the incident laser light, and the angle is 0 ° to 45 °.
5. The system is characterized by comprising a semiconductor laser used for emitting incident laser, a lens, a polaroid and an optical fiber which are sequentially arranged along the path of the incident laser, and an included angle between the central axis of the polaroid and the direction of the incident laser can be adjusted.
6. The system of claim 5, wherein the polarizer is made of glass or silicon or plastic.
7. The system of claim 5, wherein the included angle is between 0 ° and 45 °.
8. The system of claim 5, wherein the polarizer is a polyvinyl alcohol film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110197586.5A CN113031172A (en) | 2021-02-22 | 2021-02-22 | Method for anti-reflection and effectively adjusting energy entering optical fiber and optical module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110197586.5A CN113031172A (en) | 2021-02-22 | 2021-02-22 | Method for anti-reflection and effectively adjusting energy entering optical fiber and optical module |
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| CN113031172A true CN113031172A (en) | 2021-06-25 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222115A (en) * | 2007-01-10 | 2008-07-16 | 恩益禧电子股份有限公司 | Semiconductor laser module |
| CN102279094A (en) * | 2011-03-16 | 2011-12-14 | 中国科学院上海技术物理研究所 | Apparatus and method for calibrating transmission axis of polaroid |
| CN202600257U (en) * | 2012-06-07 | 2012-12-12 | 保定天威薄膜光伏有限公司 | Full automatic continuous laser power adjusting device |
| CN203102702U (en) * | 2013-01-09 | 2013-07-31 | 华北电力大学（保定） | Teaching instrument for demonstrating Marius's law |
| CN208874050U (en) * | 2018-09-20 | 2019-05-17 | 周利民 | A kind of laser aid and laser system that polarization light polarization direction is adaptive |
| CN111323635A (en) * | 2020-02-26 | 2020-06-23 | 贵州江源电力建设有限公司 | Optical fiber sensing system and method for measuring current intensity of high-voltage conductor in non-contact mode |
-
2021
- 2021-02-22 CN CN202110197586.5A patent/CN113031172A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222115A (en) * | 2007-01-10 | 2008-07-16 | 恩益禧电子股份有限公司 | Semiconductor laser module |
| CN102279094A (en) * | 2011-03-16 | 2011-12-14 | 中国科学院上海技术物理研究所 | Apparatus and method for calibrating transmission axis of polaroid |
| CN202600257U (en) * | 2012-06-07 | 2012-12-12 | 保定天威薄膜光伏有限公司 | Full automatic continuous laser power adjusting device |
| CN203102702U (en) * | 2013-01-09 | 2013-07-31 | 华北电力大学（保定） | Teaching instrument for demonstrating Marius's law |
| CN208874050U (en) * | 2018-09-20 | 2019-05-17 | 周利民 | A kind of laser aid and laser system that polarization light polarization direction is adaptive |
| CN111323635A (en) * | 2020-02-26 | 2020-06-23 | 贵州江源电力建设有限公司 | Optical fiber sensing system and method for measuring current intensity of high-voltage conductor in non-contact mode |
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