Optical device with double-path light splitting detection function
By employing a four-core fiber optic structure and a dual photoelectric detection chip design in the spectrometer, the problem that existing spectrometers cannot detect multiple beams simultaneously has been solved, achieving miniaturization of optical equipment and efficient beam detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG SANSHIYUAN TECH CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-04-28
AI Technical Summary
Existing spectrophotometers, which only have one photodetector, cannot simultaneously detect the optical power of multiple beams, resulting in an increase in size during the miniaturization of optical equipment.
It adopts a four-core pigtail structure, with two input optical fibers and two output optical fibers. At one end, a first lens, a beam splitter and a photodetector are set. The photodetector is equipped with two photodetector chips that share a grounding pin to realize the optical power detection of the two beams.
Reducing the number of photodetectors in optical equipment lowers the overall size of the equipment, helps to miniaturize optical equipment, and improves the accuracy and cost-effectiveness of beam detection.
Smart Images
Figure CN224176761U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of optical communication devices, specifically, to an optical device with dual-path beam splitting detection function. Background Technology
[0002] A spectrometer is a common optical device used to split optical signals and measure their optical power. It is widely used in fields such as spectral analysis and optical communication. Existing spectrometers typically use methods such as fiber coupling or prism splitting to separate the input beam into a transmitted beam and a reflected beam. The transmitted beam is then converted into an electrical signal by a photoelectric detection chip for measurement.
[0003] However, existing spectrophotometers have limitations in terms of integration. Specifically, a spectrophotometer uses a single photodetector, which contains only one photodetector chip, and can only detect the optical power of one beam at a time. As the integration of fiber optic communication systems increases, the number of beams requiring optical power detection also increases, necessitating a large number of spectrophotometers. However, with the increasing demands for miniaturization in optical equipment, using a large number of spectrophotometers will increase the overall size of the optical equipment, hindering its miniaturization. Summary of the Invention
[0004] The purpose of this invention is to provide an optical device with dual-path beam splitting detection function that can reduce the overall size of optical equipment.
[0005] To achieve the above objectives, the optical device with dual-path beam splitting and detection function provided by this utility model includes a four-core pigtail. The four-core pigtail contains two input optical fibers and two output optical fibers. At the first end of the four-core pigtail, a first lens, a beam splitter, a second lens, and a photodetector are arranged sequentially along the optical path. The photodetector is provided with a base. On the side of the base facing the second lens, a first photodetector chip and a second photodetector chip are arranged. On the second side of the base, a first positive pin, a second positive pin, and a ground pin are arranged. The first positive pin is electrically connected to the first photodetector chip, the second positive pin is electrically connected to the second photodetector chip, and the ground pin is electrically connected to both the first and second photodetector chips.
[0006] As can be seen from the above scheme, the photodetector is equipped with two photodetector chips, and the two photodetector chips share a ground pin. Therefore, one photodetector can detect the optical power of two beams. Compared with traditional beam splitters, the device of this invention can reduce the number of photodetectors used, thereby reducing the overall size of the optical equipment and facilitating the miniaturization of optical equipment.
[0007] A preferred arrangement is that the two input optical fibers and the two output optical fibers are arranged in a straight line within a four-core pigtail.
[0008] Arranging four optical fibers in a straight line allows for higher fiber alignment precision. This reduces the need for extremely precise placement of the two photodetector chips in the photodetector, thereby lowering the production cost of the photodetector.
[0009] A further proposed solution is to arrange the two input optical fibers and the two output optical fibers at equal intervals within a four-core pigtail.
[0010] An alternative is to arrange the two input optical fibers and the two output optical fibers in an array within a four-core pigtail.
[0011] Because the four optical fibers are arranged in a 2×2 array within the four-core pigtail, the cross-sectional area of the four-core pigtail can be made smaller, and the array arrangement of the four optical fibers can also simplify the production process of the four-core pigtail.
[0012] A further option is that the first lens is a collimating lens, which can be a self-focusing lens, a convex lens, an aspherical lens, or a spherical lens.
[0013] It can be seen that the beams output from the two input optical fibers are collimated by the collimating lens before being output to the beam splitter, which makes the position of the beam incident on the beam splitter more accurate. This is beneficial for the reflected beam to return accurately to the corresponding output optical fiber, and also for the transmitted beam to be incident on the corresponding photoelectric detection chip.
[0014] A further proposed solution is to use a spherical lens as the second lens.
[0015] Therefore, by setting up a spherical lens, the transmitted light beam can be accurately incident on the corresponding photoelectric detection chip, thereby ensuring the accuracy of the light power detected by the photoelectric detection chip.
[0016] A further proposed solution is to make the line connecting the midpoint of the first photoelectric detection chip and the midpoint of the second photoelectric detection chip parallel to the line connecting the midpoints of the two input optical fibers.
[0017] With the above settings, the beams output from the two input optical fibers can be split and accurately incident on the first and second photoelectric detection chips.
[0018] A further option is that the beam splitter is a beam splitter located at the end of the first lens away from the four-core pigtail; or, the beam splitter is a beam splitting film located on the end face of the first lens away from the four-core pigtail.
[0019] Setting the beam splitter as a beam splitting film can reduce the size of optical devices with dual-path beam splitting detection capabilities.
[0020] A further approach is to ensure that the transmission ratio of the beam splitter does not exceed 50%. Attached Figure Description
[0021] Figure 1 This is a structural schematic diagram of the first embodiment of this utility model.
[0022] Figure 2 This is a cross-sectional view of the four-core pigtail of the first embodiment of this utility model.
[0023] Figure 3 This is a cross-sectional view of the photodetector according to the first embodiment of this utility model.
[0024] Figure 4 This is a structural schematic diagram of the second embodiment of the present invention.
[0025] Figure 5 This is a cross-sectional view of the four-core pigtail of the second embodiment of this utility model.
[0026] Figure 6 This is a cross-sectional view of the photodetector according to the second embodiment of this utility model.
[0027] Figure 7 This is a structural schematic diagram of the third embodiment of this utility model.
[0028] Figure 8 This is a cross-sectional view of the four-core pigtail of the third embodiment of this utility model.
[0029] Figure 9 This is a cross-sectional view of the photodetector according to the third embodiment of this utility model.
[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation
[0031] The optical device of this invention with dual-path beam splitting detection function is an optical device that can split two beams and detect the optical power of the two beams simultaneously. It reduces the overall size of the optical device by using only one photodetector to detect the optical power of the two beams.
[0032] First embodiment:
[0033] See Figure 1 The optical device with dual-path beam splitting detection function in this embodiment has a four-core pigtail 10. The four-core pigtail 10 contains two input optical fibers 11 and 12 and two output optical fibers 13 and 14. The four optical fibers are arranged in an array within the four-core pigtail 10, such as... Figure 2 As shown, four optical fibers are arranged in a 2×2 array.
[0034] A first lens 15 is provided at one end of the four-core pigtail 10. In this embodiment, the first lens 15 is a focusing lens, such as a self-focusing lens, a convex lens, an aspherical lens, or a spherical lens, used to collimate the light beam emitted from the input optical fibers 11 and 12.
[0035] A beam splitter is provided at the end of the first lens 15 furthest from the four-core pigtail 10. In this embodiment, the beam splitter is a beam splitter 16. The beam splitter 16 can split the incident light beam according to a preset ratio. The reflected light beam will be reflected back to the first lens 15, and the transmitted light beam will pass through the beam splitter 16 and continue to propagate. Since the reflected light beam is used for continued propagation and carries the information to be transmitted, while the transmitted light beam is used to detect the optical power of the beam, the proportion of the transmitted light beam should not be too high. Preferably, the proportion m of the transmitted light beam should not exceed 50%, and more preferably, the proportion of the transmitted light beam is 3%, that is, 97% of the optical power of the incident light beam is reflected. The reflected light beam will be reflected through the first lens 15, collimated by the first lens 15, and then continue to be incident on the two output optical fibers 13 and 14, and continue to be transmitted to the next level of optical equipment.
[0036] Of course, in other embodiments, the beam splitter can also be a beam splitting film disposed on the end face of the first lens 15 away from the four-core pigtail 10. The beam splitting ratio of the beam splitting film is preset, for example, the transmission ratio is 3%. Since the beam splitting film is a film coated on the end face of the first lens 15, compared with the beam splitter, the thickness of the beam splitting film is very small, which can reduce the size of the optical device and eliminate the process of attaching the beam splitter to one end of the first lens, thereby reducing the production cost of the optical device.
[0037] A second lens is disposed at the end of the beam splitter 16 away from the first lens 15. In this embodiment, the second lens is a spherical lens 17. The transmitted light beam is focused onto the photodetector 20 after passing through the spherical lens 17. The photodetector 20 is disposed at the end of the spherical lens 17 away from the beam splitter 16. In this embodiment, the photodetector 20 has a base 21. A first photodetector chip 23 and a second photodetector chip 24 are disposed on the side of the base 21 facing the second lens. See [link to relevant documentation]. Figure 3 The first photodetector chip 23 and the second photodetector chip 24 are arranged vertically. Preferably, the line connecting the midpoint of the first photodetector chip 23 and the midpoint of the second photodetector chip 24 is parallel to the line connecting the midpoints of the two input optical fibers 11 and 12. This ensures that the beams incident from the two input optical fibers 11 and 12 are split and the transmitted beams are accurately incident on the corresponding photodetector chips.
[0038] The photodetector 20 has three pins on its second side, which is opposite to the second lens: a first positive pin 25, a second positive pin 26, and a ground pin 27. The first positive pin 25 is electrically connected to the first photodetector chip 23, the second positive pin 26 is electrically connected to the second photodetector chip 24, and the ground pin 27 is electrically connected to both the first photodetector chip 23 and the second photodetector chip 24. Therefore, the first photodetector chip 23 and the second photodetector chip 24 share a single ground pin 27.
[0039] Since the photodetector 20 is equipped with two photodetector chips 23 and 24, which can detect the optical power of the light beams incident from the two input optical fibers 11 and 12 respectively, when it is necessary to detect the optical power of multiple light beams, only half the number of light beams need to be set up as photodetectors. Compared with traditional beam splitting detection devices, this embodiment can effectively reduce the size of the optical equipment.
[0040] Second embodiment:
[0041] See Figure 4 The optical device with dual-path beam splitting detection function in this embodiment has a four-core pigtail 30. The four-core pigtail 30 contains two input optical fibers 31 and 32 and two output optical fibers 33 and 34. The four optical fibers are arranged in an array within the four-core pigtail 30, such as... Figure 5 As shown, four optical fibers are arranged in a 2×2 array.
[0042] A first lens 35 is provided at one end of the four-core pigtail 30. In this embodiment, the first lens 35 is a focusing lens, such as a self-focusing lens, a convex lens, an aspherical lens, or a spherical lens, used to collimate the light beam emitted from the input optical fibers 31 and 32.
[0043] A beam splitter, such as a beam splitter 36, is disposed at the end of the first lens 35 away from the four-core pigtail 30. The beam splitter 36 can split the incident light beam according to a preset ratio. The reflected light beam will be reflected back to the first lens 35, and the transmitted light beam will pass through the beam splitter 36 and continue to propagate. Preferably, the proportion of the transmitted light beam does not exceed 50%, for example, 3%. In other embodiments, the beam splitter can also be a beam splitting film disposed on the end face of the first lens 35 away from the four-core pigtail 30.
[0044] Unlike the first embodiment, this embodiment has a prism 38 at the end of the beam splitter 36 away from the first lens 35, and a second lens at the end of the prism 38 away from the beam splitter 36. In this embodiment, the second lens is a spherical lens 37, and the transmitted light beam is focused onto the photodetector 40 after passing through the spherical lens 37. The prism 38 in this embodiment allows the transmitted light beam after passing through the beam splitter 36 to be incident on the photodetector 40 more parallelly. Because the exit angle of the transmitted light beam decreases after passing through the prism 38, the transmitted light beam can be incident on the second lens 37 at a nearly parallel angle.
[0045] The photodetector 40 is disposed at the end of the spherical lens 37 away from the beam splitter 36. In this embodiment, the photodetector 40 has a base 41, and a first photodetector chip 43 and a second photodetector chip 44 are disposed on the side of the base 41 facing the second lens. See [link to documentation]. Figure 6 The first photodetector chip 43 and the second photodetector chip 44 are arranged side by side. Preferably, the line connecting the midpoint of the first photodetector chip 43 and the midpoint of the second photodetector chip 44 is parallel to the line connecting the midpoints of the two input optical fibers 31 and 32.
[0046] The photodetector 40 has three pins on its second side, which is opposite to the second lens: a first positive pin 45, a second positive pin 46, and a ground pin 47. The first positive pin 45 is electrically connected to the first photodetector chip 43, the second positive pin 46 is electrically connected to the second photodetector chip 44, and the ground pin 47 is electrically connected to both the first photodetector chip 43 and the second photodetector chip 44. Therefore, the first photodetector chip 43 and the second photodetector chip 44 share a single ground pin 47.
[0047] Third embodiment:
[0048] See Figure 7 The optical device with dual-path beam splitting detection function in this embodiment has a four-core pigtail 50, which contains two input optical fibers 51 and 52 and two output optical fibers 53 and 54. Unlike the first embodiment, in this embodiment, the four optical fibers are arranged in a straight line within the four-core pigtail 50. Figure 8 As shown. Preferably, the distance between any two adjacent optical fibers is equal, that is, the four optical fibers are arranged at equal intervals within the four-core pigtail 50.
[0049] A first lens 55 is provided at one end of the four-core pigtail 50. In this embodiment, the first lens 55 is a focusing lens, such as a self-focusing lens, a convex lens, an aspherical lens, or a spherical lens, used to collimate the light beam emitted from the input optical fibers 51 and 52.
[0050] A beam splitter, such as a beam splitter 56, is disposed at the end of the first lens 55 away from the four-core pigtail 50. The beam splitter 56 can split the incident light beam according to a preset ratio. The reflected light beam will be reflected back to the first lens 55, and the transmitted light beam will pass through the beam splitter 56 and continue to propagate. Preferably, the proportion of the transmitted light beam does not exceed 50%, for example, 3%. In other embodiments, the beam splitter can also be a beam splitting film disposed on the end face of the first lens 55 away from the four-core pigtail 50.
[0051] A second lens is disposed at the end of the beam splitter 56 away from the first lens 55. In this embodiment, the second lens is a spherical lens 57. The transmitted light beam is focused onto the photodetector 60 after passing through the spherical lens 57. The photodetector 60 is disposed at the end of the spherical lens 57 away from the beam splitter 56. In this embodiment, the photodetector 60 has a base 61. A first photodetector chip 63 and a second photodetector chip 64 are disposed on the side of the base 61 facing the second lens. See [reference needed] Figure 9 The first photodetector chip 63 and the second photodetector chip 64 are arranged side by side. Preferably, the line connecting the midpoint of the first photodetector chip 63 and the midpoint of the second photodetector chip 64 is parallel to the line connecting the midpoints of the two input optical fibers 51 and 52.
[0052] The photodetector 60 has three pins on its second side, which is opposite to the second lens: a first positive pin 65, a second positive pin 66, and a ground pin 67. The first positive pin 65 is electrically connected to the first photodetector chip 63, the second positive pin 66 is electrically connected to the second photodetector chip 64, and the ground pin 67 is electrically connected to both the first photodetector chip 63 and the second photodetector chip 64. Therefore, the first photodetector chip 63 and the second photodetector chip 64 share a single ground pin 67.
[0053] Since the four optical fibers in the four-wire pigtail 50 of this embodiment are arranged in a straight line, the optical fiber arrangement accuracy is higher. The placement of the first photodetector chip 63 and the second photodetector chip 64 of the photodetector 60 does not need to be very precise, which can reduce the production cost of the photodetector.
[0054] Finally, it should be emphasized that the above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An optical device with dual-path beam splitting and detection function, including a four-core pigtail, wherein the four-core pigtail is provided with two input optical fibers and two output optical fibers; Its features are: A first lens, a beam splitter, a second lens, and a photodetector are sequentially arranged along the optical path at the first end of the four-core pigtail. The photodetector is provided with a base. A first photodetector chip and a second photodetector chip are provided on the side of the base facing the second lens. A first positive electrode pin, a second positive electrode pin, and a ground pin are provided on the second side of the base. The first positive electrode pin is electrically connected to the first photodetector chip, the second positive electrode pin is electrically connected to the second photodetector chip, and the ground pin is electrically connected to both the first photodetector chip and the second photodetector chip.
2. The optical device with dual-path beam splitting detection function according to claim 1, characterized in that: The two input optical fibers and the two output optical fibers are arranged in a straight line within the four-core pigtail.
3. The optical device with dual-path beam splitting detection function according to claim 2, characterized in that: The two input optical fibers and the two output optical fibers are arranged at equal intervals within the four-core pigtail.
4. The optical device with dual-path beam splitting detection function according to claim 1, characterized in that: The two input optical fibers and the two output optical fibers are arranged in an array within the four-core pigtail.
5. The optical device with dual-path beam splitting detection function according to any one of claims 1 to 4, characterized in that: The first lens is a collimating lens, which can be a self-focusing lens, a convex lens, an aspherical lens, or a spherical lens.
6. The optical device with dual-path beam splitting detection function according to any one of claims 1 to 4, characterized in that: The second lens is a spherical lens.
7. The optical device with dual-path beam splitting detection function according to any one of claims 1 to 4, characterized in that: The line connecting the midpoint of the first photoelectric detection chip and the midpoint of the second photoelectric detection chip is parallel to the line connecting the midpoints of the two input optical fibers.
8. The optical device with dual-path beam splitting detection function according to any one of claims 1 to 4, characterized in that: The beam splitter is a beam splitter located at the end of the first lens furthest from the four-core pigtail.
9. The optical device with dual-path beam splitting detection function according to any one of claims 1 to 4, characterized in that: The beam splitter is a beam splitting film disposed on the end face of the first lens away from the four-core pigtail.
10. The optical device with dual-path beam splitting detection function according to any one of claims 1 to 4, characterized in that: The transmission ratio of the beam splitter does not exceed 50%.