CN216285838U - Small photosensitive surface spectral detector - Google Patents
Small photosensitive surface spectral detector Download PDFInfo
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- CN216285838U CN216285838U CN202121891240.7U CN202121891240U CN216285838U CN 216285838 U CN216285838 U CN 216285838U CN 202121891240 U CN202121891240 U CN 202121891240U CN 216285838 U CN216285838 U CN 216285838U
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Abstract
The utility model discloses a small-photosurface spectral detector.A input optical fiber and an output optical fiber are single-mode optical fibers, a section of graded-index multimode optical fiber is welded at the end parts of the input optical fiber and the output optical fiber, the end part of the graded-index multimode optical fiber is an inclined plane, the section of a spectral lens is in a right-angled trapezoid shape, and a light transmitting ball is arranged between the spectral lens and a detector chip; by adopting the scheme, the utility model has the characteristics of simple structure, small volume and low cost, and the glass ball is arranged between the beam splitting lens and the detector chip, so that parallel light from the beam splitting lens can be converged on a smaller detector chip, and the trend of small size of the chip is adapted.
Description
Technical Field
The utility model relates to the technical field of optical communication, in particular to a photoelectric detector.
Background
Chinese patent CN 111290087 a discloses a spectroscopic detector, which includes an input/output portion, a spectroscopic lens, a detector chip and a sealing tube.
Chinese patent CN 107390329 a discloses a unidirectional TAP PD, which includes an input optical fiber, an optical fiber connector, a beam splitting lens, a detector assembly and an output optical fiber, wherein the input optical fiber and the output optical fiber are disposed in two holes of the optical fiber connector, and the beam splitting lens is disposed between the optical fiber connector and the detector assembly; the end, facing the optical fiber connector, of the light splitting lens is ground into an angle alpha, and the end, facing the detector assembly, of the light splitting lens is ground into an angle beta; the angles of alpha and beta are used to make the light input by the input end fiber vertical to the position where the beam splitting lens is not ground into the angle of beta and the light input by the output end fiber totally reflected at the position where the angle of beta is ground.
Because the light input by the optical fiber is sine wave instead of standard parallel light, G-LENS lenses or grinding angle pieces are required in the existing light splitting detectors, so that the size of the detector is larger, and the high density degree of electronic components is difficult to improve; and the processing cost of the G-LENS and the angle grinding sheet is higher. If the transmitted light beam emitted by the beam splitter lens needs to be converged to another additional condenser lens, the size of the product is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a small-sized and low-cost small-photosurface spectral detector which can use a small detector chip,
to achieve the above object, the present invention provides a small photosurface spectral detector, which comprises: the input and output part comprises an input optical fiber and an output optical fiber, wherein the input optical fiber and the output optical fiber are single-mode optical fibers, a section of graded-index multimode optical fiber is welded at the end parts of the input optical fiber and the output optical fiber, the length of the graded-index multimode optical fiber is odd times of the wavelength of an input optical fiber input light beam 1/4, the end part of the graded-index multimode optical fiber is an inclined plane, the cross section of the light splitting lens is in a right trapezoid shape, the inclined plane of the light splitting lens is parallel and opposite to the inclined plane at the end part of the graded-index multimode optical fiber, and a light transmitting ball is arranged between the light splitting lens and the detector chip.
By adopting the scheme, the utility model does not use a Greens lens with higher cost and larger size, has the characteristics of simple structure, small volume and low cost, and is provided with the glass ball between the beam splitting lens and the detector chip, so that parallel light from the beam splitting lens can be converged on a smaller detector chip, thereby adapting to the trend of small size of the chip.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the light path of the parallel light from the light splitting lens through the glass ball.
Description of reference numerals:
1. sealing the tube, 2, and injecting optical fiber; 3. an outgoing optical fiber; 4. a graded-index multimode optical fiber; 5. a spectroscopic lens; 6. glass ball, 7, detector chip.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, in a compact optical signal monitoring and splitting detector according to the present invention, an input optical fiber 2 and an output optical fiber 3 as an input/output portion, a graded index multimode optical fiber 4 welded at the end portions of the input optical fiber 2 and the output optical fiber 3 by using an optical fiber fusion splicer, a splitting lens 5, and a detector chip 6 are sequentially disposed in a sealing tube 1. The input fiber 2 and the output fiber 3 are single mode fibers, and the input fiber 2 is used for inputting light beams. The beam splitting lens 5 is used for splitting an input light beam from an input end into a transmitted light beam and a reflected light beam, the output end is used for outputting the reflected light beam, and the detector chip 7 is used for converting the transmitted light beam into an electric signal.
The end part of the graded-index optical fiber 4 is an inclined plane, the section of the spectroscope lens 5 is a right trapezoid, and the inclined plane (i.e. the light splitting plane) of the spectroscope lens 5 is parallel to the inclined plane of the end part of the graded-index multimode optical fiber.
The length of the GI multimode fiber 4 is an odd multiple of the wavelength of the input beam 1/4 of the input fiber 2, and the GI multimode fiber 4 converts the input beam from a sine wave to a parallel wave. If the pitch of 1/4, 3/4 and 5/4 are taken, the proper length of the graded index fiber can be obtained to make the emergent light be collimated parallel light. The beam splitting lens splits the parallel light beam from the input end into a transmitted light beam and a reflected light beam. As shown in fig. 1, a glass ball 6 is provided between the beam splitter lens 5 and the detector chip 7, and as shown in fig. 2, the parallel transmitted beams are converged by the glass ball 6, so that the detector chip 7 can be a chip with a smaller size and a smaller photosurface.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (1)
1. A small photosurface photodetector comprising: input/output portion, spectral lens, detector chip and seal the pipe, input/output portion is including input fiber and output fiber, its characterized in that: the input optical fiber and the output optical fiber are single mode optical fibers, a section of graded index multimode optical fiber is welded at the end parts of the input optical fiber and the output optical fiber, the length of the graded index multimode optical fiber is odd times of the wavelength of an input light beam 1/4 of the input optical fiber, the end part of the graded index multimode optical fiber is an inclined plane, the section of the light splitting lens is in a right trapezoid shape, the inclined plane of the light splitting lens is parallel and opposite to the inclined plane at the end part of the graded index multimode optical fiber, and a light transmitting ball is arranged between the light splitting lens and the detector chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121891240.7U CN216285838U (en) | 2021-08-13 | 2021-08-13 | Small photosensitive surface spectral detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121891240.7U CN216285838U (en) | 2021-08-13 | 2021-08-13 | Small photosensitive surface spectral detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216285838U true CN216285838U (en) | 2022-04-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121891240.7U Active CN216285838U (en) | 2021-08-13 | 2021-08-13 | Small photosensitive surface spectral detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216285838U (en) |
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2021
- 2021-08-13 CN CN202121891240.7U patent/CN216285838U/en active Active
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