CN219757526U - Wavelength and polarization insensitive optical power detector - Google Patents
Wavelength and polarization insensitive optical power detector Download PDFInfo
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- CN219757526U CN219757526U CN202320206709.1U CN202320206709U CN219757526U CN 219757526 U CN219757526 U CN 219757526U CN 202320206709 U CN202320206709 U CN 202320206709U CN 219757526 U CN219757526 U CN 219757526U
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- 230000009977 dual effect Effects 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims description 32
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
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- 229910052737 gold Inorganic materials 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 5
- 230000001419 dependent effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000007747 plating Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of optical power detectors, and provides an optical power detector insensitive to wavelength and polarization, which comprises: the dual optical fiber head, the collimating lens, the light splitting diaphragm and the photoelectric detector are sequentially arranged; the light splitting diaphragm comprises a glass substrate, wherein a regular pattern light splitting film is plated on the glass substrate, the regular pattern light splitting film consists of a plurality of regular pattern films which are distributed at intervals, the regular pattern films are metal reflecting films, and the interval areas are not plated with films. The utility model has the advantages that: the optical power detector overcomes the defects of a light splitting diaphragm based on a dielectric film, and has the performances of larger working wavelength range, larger light beam receiving angle range, smaller polarization-related loss and smaller wavelength-related loss.
Description
Technical Field
The utility model relates to the technical field of optical power detectors, in particular to an optical power detector insensitive to wavelength and polarization.
Background
The conventional optical power detector consists of a double optical fiber head, a collimating lens, a beam splitting diaphragm and a photoelectric detector. Wherein the light-splitting membrane is a flat plate plated with a dielectric film with a certain light-splitting ratio. The light of the input optical fiber of the double optical fiber head is incident on the dielectric film through the collimating lens, one part of energy light is transmitted and enters the photoelectric detector, and the other part of energy light is reflected and enters the output optical fiber of the double optical fiber head after passing through the collimating lens.
Due to the limitations of dielectric film material characteristics and film system design, the light-splitting diaphragm based on the dielectric film has the following defects: 1. the working wavelength range is small, generally 40nm; 2. the light beam acceptance angle range is small, generally 5 degrees; 3. the polarization dependent loss is large, generally 0.2dB; 4. the wavelength dependent loss is large, typically 0.2dB.
Therefore, how to provide an optical power detector with a brand new structure, and overcome the shortcomings of the light splitting membrane based on the dielectric membrane, is a technical problem to be solved in the field at present.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an optical power detector insensitive to wavelength and polarization and overcomes the defect of a light splitting diaphragm based on a dielectric film.
The utility model is realized in the following way: an optical power detector insensitive to wavelength and polarization, comprising:
the dual optical fiber head, the collimating lens, the light splitting diaphragm and the photoelectric detector are sequentially arranged;
the light splitting membrane comprises a glass substrate, wherein a regular pattern light splitting membrane is plated on the glass substrate, the regular pattern light splitting membrane consists of a plurality of regular pattern membranes which are distributed at intervals, the regular pattern membranes are metal reflecting membranes, and the interval areas are not plated with films;
the double-fiber head comprises an input fiber and an output fiber, wherein light rays emitted by the input fiber are incident to the regular pattern light splitting film after passing through the collimating lens, one part of the light rays are beaten at a spacing area of the regular pattern light splitting film and directly transmitted into the photoelectric detector, and the other part of the light rays are beaten at a regular pattern film of the regular pattern light splitting film and are converged to the output fiber after being reflected by the collimating lens.
Further, the metal reflective film is an aluminum film or a silver film or a gold film or a copper film.
Further, the regular pattern is circular or rectangular.
Further, the metal reflective film is laminated with a plurality of dielectric films.
Further, the glass substrate is in the shape of a flat sheet.
Further, the dual-fiber head further comprises a dual-fiber capillary, and the input optical fiber and the output optical fiber are fixedly arranged on the dual-fiber capillary.
Further, the collimating lens is a graded index lens or a spherical lens or an aspherical lens.
Further, the light-splitting membrane is omitted, and the light-splitting membrane with the regular pattern is directly plated at the emergent plane end of the graded index lens.
Further, the light splitting membrane is omitted, and the light splitting membrane with the regular pattern is directly plated on the window sheet of the photoelectric detector.
Further, the photoelectric detector comprises a photoelectric detection chip and a packaging shell, wherein the photoelectric detection chip is fixedly connected with the packaging shell, and light transmitted by the regular pattern light splitting film enters the photoelectric detection chip.
The utility model has the advantages that: compared with the conventional optical power detector adopting the light-splitting sheet with the dielectric film, the optical power detector provided by the utility model adopts the metal reflecting film with the regular pattern as the light-splitting medium, one part of light of the input optical fiber is beaten on the uncoated area of the light-splitting film with the regular pattern and directly transmitted in the original direction to enter the photoelectric detector, and the other part of light is beaten on the metal reflecting film of the light-splitting film with the regular pattern to be reflected and enter the output optical fiber.
Drawings
The utility model will be further described with reference to examples of embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of a wavelength and polarization insensitive optical power detector of the present utility model.
Fig. 2 is a schematic structural diagram of a light-splitting membrane in the present utility model.
Fig. 3 is a left side view of fig. 2.
Fig. 4 is a schematic diagram showing the P-ray, S-ray components and PDL of the reflected light beam of the light-splitting diaphragm according to the wavelength variation curve of the present utility model.
Fig. 5 is a schematic diagram showing the P-ray, S-ray components and PDL of the transmitted beam of the light-splitting diaphragm according to the wavelength variation curve of the present utility model.
Reference numerals: a dual optical fiber head 1; an input optical fiber 11; an output optical fiber 12; a double fiber capillary 13; a collimator lens 2; a light-splitting membrane 3; a metal reflective film 31; an uncoated region 32; a photodetector 4; a photoelectric detection chip 41; a package housing 42; light rays 100 exiting from the input fiber; light ray 101 is transmitted; the light ray 102 is reflected.
Detailed Description
The embodiment of the utility model overcomes the defects of a light splitting diaphragm based on a dielectric film in the background technology by providing the light power detector insensitive to wavelength and polarization, and realizes the purposes of larger working wavelength range, larger light beam acceptance angle range, smaller polarization-related loss and smaller wavelength-related loss.
The technical scheme in the embodiment of the utility model aims to solve the defects, and the general idea is as follows:
the utility model aims to provide an optical power detector with a brand new structure, wherein a conventional dielectric film is canceled from a light splitting film of the optical power detector, a glass substrate of the light splitting film is selected to be plated with a regular pattern light splitting film, the regular pattern light splitting film consists of a plurality of regular pattern films which are distributed at intervals, the regular pattern films are metal reflecting films, and an interval area is not plated with a film; the light rays emitted by the input optical fiber enter the regular pattern light splitting film after passing through the collimating lens, wherein a part of the light rays strike the interval area of the regular pattern light splitting film and directly transmit into the photoelectric detector, so that the stable detection of the signal light power is realized; and the other part of light rays are beaten on the regular pattern film of the regular pattern light-splitting film, reflected and converged to the output optical fiber through the collimating lens, so that the transmission of optical signals is realized.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, a preferred embodiment of the present utility model.
An optical power detector insensitive to wavelength and polarization, comprising:
the dual optical fiber head 1, the collimating lens 2, the light splitting diaphragm 3 and the photoelectric detector 4 are sequentially arranged;
the light splitting membrane 3 comprises a glass substrate, wherein a regular pattern light splitting membrane is plated on the glass substrate, the regular pattern light splitting membrane consists of a plurality of regular pattern membranes which are distributed at intervals, the regular pattern membranes are metal reflecting membranes 31, and the interval areas are not plated with films;
the dual-fiber head 1 comprises an input fiber 11 and an output fiber 12, wherein the light 100 emitted from the input fiber 11 passes through the collimating lens 2 and then enters the regular pattern light splitting film, one part of the light is transmitted into the photodetector 4 directly in the interval area of the regular pattern light splitting film, and the other part of the light is transmitted into the regular pattern film of the regular pattern light splitting film, and is reflected and then converged to the output fiber 12 through the collimating lens 2.
The metal reflective film 31 is an aluminum film or a silver film or a gold film or a copper film.
The regular pattern is circular, a plurality of circles distributed at intervals form a circular spot pattern, the circular area is plated with a metal reflecting film 31, and other areas are not plated with films. Or the regular pattern is rectangular, a plurality of rectangles distributed at intervals form a line stripe pattern, a reflecting film is plated on the rectangular area, and other areas are not plated with films. Or the regular pattern is a geometric pattern of other rules
The metal reflecting film is overlapped with a plurality of dielectric films. The reflectivity of the metal reflective film is enhanced. The number of layers herein is at least one.
The glass substrate is in the shape of a flat sheet.
The dual-fiber head 1 further comprises a dual-fiber capillary 13, and the input optical fiber 11 and the output optical fiber 12 are fixedly arranged on the dual-fiber capillary 13.
The collimator lens 2 is a graded index lens or a spherical lens or an aspherical lens.
In another implementation manner of this embodiment, the light-splitting film is omitted, and the light-splitting film with regular pattern is directly plated on the exit plane end of the graded index lens.
In another implementation manner of this embodiment, the light splitting membrane is omitted, and the regular pattern light splitting membrane is directly plated on the window of the photodetector.
The photodetector 4 includes a photodetector chip 41 and a package housing 42, where the photodetector chip 41 is fixedly connected to the package housing 42, and light transmitted from the regular pattern light splitting film enters the photodetector chip 41.
The working principle of the wavelength and polarization insensitive optical power detector of the utility model is as follows:
the light 100 emitted from the input optical fiber 11 of the double optical fiber head 1 enters the front end face of the collimating lens 2, is converted into collimated light by the collimating lens 2, enters the regular pattern light-splitting film of the light-splitting film 3, and part of light is beaten on the uncoated area of the regular pattern light-splitting film to directly penetrate out of the light-splitting film 3, and the transmitted light 101 directly enters the photoelectric detection chip 41 of the photoelectric detector 4 to realize stable detection of signal light power; the other part of light is beaten on the film coating area of the metal reflecting film 31 of the light splitting film with the regular pattern and reflected, and the reflected light 102 is converged to the output optical fiber 12 through the collimating lens 2 and is output outwards, so that the transmission of optical signals is realized.
The utility model discloses a method for plating a regular pattern light splitting film on a glass substrate of a light splitting diaphragm, which comprises the steps of distributing the light splitting film on a glass substrate according to a regular pattern by utilizing a photoetching process and a film plating process, plating a metal reflecting film on a part of areas, and plating no metal reflecting film on the part of areas, namely plating no film on the part of areas.
For a light beam directly transmitted from a non-coated area in a regular pattern beam-splitting film, the path of the light beam is uniform, so that the light beam is very insensitive to the polarization state of light, has little selectivity to wavelength and is insensitive to incident angle, and therefore, the transmitted light has very low Polarization Dependent Loss (PDL) and very low Wavelength Dependent Loss (WDL) in a very large operating wavelength range (such as 200nm range) and a very large receiving angle range (such as +/-10 degrees), and the general value is less than 0.05dB.
For light beams reflected from the areas of the metallized reflective film in a regular pattern, very low Polarization Dependent Loss (PDL) and very low Wavelength Dependent Loss (WDL), typically values less than 0.10dB, are also obtained for very high operating wavelength ranges (e.g., 200nm range), for very high incident angle ranges (e.g., +/-10 °) because the reflectivity values of the metallic film for the P and S light components are very close.
For a conventional light splitting device using a dielectric film, light of different wavelengths corresponds to different dielectric film systems, but are called dielectric films. A fixed film system corresponds to only a fixed operating wavelength range. The film system is a group of films formed by multiple layers of different dielectric materials and different dielectric layer thicknesses.
In this embodiment, the metal reflective film is an aluminum film, a silver film, a gold film, or a copper film, and the wavelength of the reflected light beam is greater than 300nm to 10000nm. The wavelength range of the light beam of the optical power detector is 300nm-2000nm in practical application.
Different from the conventional photoelectric detector which adopts a light splitting membrane with a dielectric film, the light splitting membrane adopted by the photoelectric detector adopts a metal reflecting membrane layer with a regular pattern as a light splitting medium, so that the product has the characteristics of larger working wavelength range, larger light beam receiving angle range, lower Polarization Dependent Loss (PDL) and lower Wavelength Dependent Loss (WDL).
The light splitting diaphragm is manufactured on a specific glass substrate, a metal reflecting film layer with a regular pattern is manufactured by adopting the most conventional photoetching and film plating technology, and the flat sheet is manufactured by adopting the cold processing technology which is the same as that of the conventional flat sheet, so that the light splitting diaphragm has high manufacturability, low cost and reliable performance.
While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the utility model, and that equivalent modifications and variations of the utility model in light of the spirit of the utility model will be covered by the claims of the present utility model.
Claims (10)
1. An optical power detector insensitive to wavelength and polarization, comprising:
the dual optical fiber head, the collimating lens, the light splitting diaphragm and the photoelectric detector are sequentially arranged;
the light splitting membrane comprises a glass substrate, wherein a regular pattern light splitting membrane is plated on the glass substrate, the regular pattern light splitting membrane consists of a plurality of regular pattern membranes which are distributed at intervals, the regular pattern membranes are metal reflecting membranes, and the interval areas are not plated with films;
the double-fiber head comprises an input fiber and an output fiber, wherein light rays emitted by the input fiber are incident to the regular pattern light splitting film after passing through the collimating lens, one part of the light rays are beaten at a spacing area of the regular pattern light splitting film and directly transmitted into the photoelectric detector, and the other part of the light rays are beaten at a regular pattern film of the regular pattern light splitting film and are converged to the output fiber after being reflected by the collimating lens.
2. A wavelength and polarization insensitive optical power detector according to claim 1, wherein the metal reflective film is an aluminum film or a silver film or a gold film or a copper film.
3. A wavelength and polarization insensitive optical power detector according to claim 1, wherein the regular pattern is circular or rectangular.
4. The wavelength and polarization insensitive optical power detector of claim 1 wherein the metal reflective film is laminated with dielectric films.
5. A wavelength and polarization insensitive optical power detector according to claim 1 wherein the glass substrate is in the shape of a flat sheet.
6. The wavelength and polarization insensitive optical power detector of claim 1 wherein the dual fiber head further comprises a dual fiber capillary, the input fiber and the output fiber being fixedly disposed in the dual fiber capillary.
7. A wavelength and polarization insensitive optical power detector according to claim 1, wherein the collimating lens is a graded index lens or a spherical lens or an aspherical lens.
8. The wavelength and polarization insensitive optical power detector of claim 7 wherein the splitting diaphragm is eliminated and the regular pattern splitting diaphragm is directly plated on the exit plane end of the graded index lens.
9. The wavelength and polarization insensitive optical power detector of claim 1 wherein the splitting film is eliminated and the regular pattern splitting film is directly plated onto the window of the photodetector.
10. The wavelength and polarization insensitive optical power detector of claim 1 wherein the photodetector comprises a photodetector chip and a package housing, the photodetector chip being fixedly connected to the package housing, light transmitted from the regular pattern beam splitting film entering the photodetector chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320206709.1U CN219757526U (en) | 2023-02-13 | 2023-02-13 | Wavelength and polarization insensitive optical power detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320206709.1U CN219757526U (en) | 2023-02-13 | 2023-02-13 | Wavelength and polarization insensitive optical power detector |
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| Publication Number | Publication Date |
|---|---|
| CN219757526U true CN219757526U (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320206709.1U Active CN219757526U (en) | 2023-02-13 | 2023-02-13 | Wavelength and polarization insensitive optical power detector |
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| CN (1) | CN219757526U (en) |
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- 2023-02-13 CN CN202320206709.1U patent/CN219757526U/en active Active
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