A photodetector

Abstract

The utility model discloses a photoelectric detector, including the To base, is equipped with To chip on it, To cap, encapsulates on the To base, the lens of alignment To chip is encapsulated on To cap, and To cap has first light transmission hole on, the adapter, encapsulates in To cap outside, attenuation element, locates between To chip and lens, is used for attenuating the light power of entering To chip, is equipped with second light transmission hole on attenuation element, and the diameter of second light transmission hole is less than the diameter of first light transmission hole, when the incident light is directly shot into the inside of detector through the adapter in the utility model, the light converging through To lens will first pass through grating piece, and a part of light is shielded by light lens, and the light after being shielded and attenuated is finally transmitted into To chip of detector, the light is no longer high -power light at this time, will not make detector To chip saturation, also will not damage detector To chip because of light too big, and the echo loss performance can satisfy the requirement simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and in particular to a photodetector. Background Technology

[0002] Saturation optical power refers to the maximum load. It refers to the maximum input optical power that the receiver of an optical module can detect while maintaining a certain bit error rate at a given transmission rate. When a photodetector is exposed to strong light, photocurrent saturation occurs. After this phenomenon, the detector needs time to recover, during which time the receiver sensitivity decreases, potentially leading to misinterpretation of the received signal and resulting in bit errors. Furthermore, it can easily damage the receiver detector. Therefore, exceeding the saturation optical power should be avoided during operation. Thus, optical modules with high transmit optical power will exhibit bit errors without attenuation loopback testing. When the input optical power of the detector reaches a certain intensity, the output photocurrent will tend to saturate.

[0003] To address the issue of testing high-power optical modules without attenuation loopback, a photodetector is proposed and put into use. Utility Model Content

[0004] The main objective of this invention is to provide a photoelectric detector that addresses existing technical problems.

[0005] To achieve the above objectives, this utility model provides a photodetector, comprising: The To base has a To chip on it; A To cap is encapsulated on the To base. The To cap is encapsulated with a lens for aligning the To chip, and the To cap has a first light-transmitting hole. The adapter is encapsulated outside the To cap; An attenuation element is disposed between the To chip and the lens to attenuate the light power entering the To chip. The attenuation element has a second light-transmitting hole, the diameter of which is smaller than the diameter of the first light-transmitting hole.

[0006] Furthermore, the attenuation element includes a support portion and a blocking portion. The support portion is connected to the To base, and the blocking portion is spaced apart from the lens. The second light-transmitting hole is formed on the blocking portion.

[0007] Furthermore, the shielding part has a shielding slope.

[0008] Furthermore, the inclination angle of the shielding slope is 30-60°.

[0009] Furthermore, the attenuation element is a grating sheet.

[0010] Furthermore, it also includes a strip plate disposed inside the To cap, the strip plate having at least two through holes, and light-blocking plates with different inner diameters disposed in adjacent through holes.

[0011] Furthermore, the light-blocking sheet is detachably connected to the strip plate.

[0012] Furthermore, the To cap is provided with a support rod, the strip plate is slidably connected to the support rod, and the length of the strip plate is less than the length of the support rod.

[0013] Furthermore, the strip plate is provided with elastic protrusions, and the support rod is provided with arc-shaped grooves that cooperate with the elastic protrusions.

[0014] Furthermore, the To cap has an opening, and the opening is provided with an openable or removable baffle.

[0015] The beneficial effects of this utility model are reflected in: In this invention, when incident light enters the detector through the adapter in the forward direction, the light focused by the To lens first passes through the grating plate, where a portion of the light is blocked by the grating. Finally, the blocked and attenuated light enters the detector To chip. At this point, the light is no longer high-power light, so it will not saturate the detector To chip, nor will it damage the detector To chip due to excessive light. At the same time, since the grating plate is angled, the light reflected back from the detector To chip is reduced in magnitude after passing through the angled grating plate, and the return loss performance can also meet the requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the photodetector structure of this utility model; Figure 2 This is a schematic diagram of the optical path principle of this utility model; Figure 3 This is a side view of the attenuation element structure of this utility model; Figure 4 This is a front view schematic diagram of the attenuation element structure of this utility model; Figure 5 This is a schematic diagram of the light-blocking sheet structure of this utility model; Figure 6 This utility model Figure 5 Enlarged schematic diagram of a local structure; Figure 7 This is a schematic diagram of the strip plate and light-blocking sheet structure of this utility model; Figure 8 This is a schematic diagram of the baffle structure of this utility model.

[0017] Explanation of reference numerals in the attached figures: 100, To base; 101, To chip; 102, To cap; 1021, first light-transmitting hole; 1022, baffle; 103, lens; 200, adapter; 300, attenuation element; 301, second light-transmitting hole; 302, support part; 303, shielding part; 400, strip plate; 4001, elastic protrusion; 401, through hole; 402, light-blocking plate; 403, support rod; 4031, arc groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] Please see Figure 1-8 This utility model provides a photodetector, including a To base 100, on which a To chip 101 is disposed; To cap 102 is packaged on To base 100. To cap 102 is packaged with lens 103 for aligning with To chip 101, and To cap 102 has a first light-transmitting hole 1021. Adapter 200 is encapsulated outside To cap 102; The attenuation element 300 is disposed between the To chip 101 and the lens 103 to attenuate the light power entering the To chip 101. The attenuation element 300 is provided with a second light-transmitting hole 301, the diameter of which is smaller than the diameter of the first light-transmitting hole 1021.

[0020] In this embodiment, when the incident light enters the detector through the adapter 200, the light focused by the lens 103 first passes through the attenuation element 300, where a portion of the light is blocked. Finally, the attenuated light enters the detector To chip 101. At this point, the light is no longer high-power light, so it will not saturate the detector To chip 101, nor will it damage the detector To chip 101 due to excessive light, thus avoiding potential misjudgment of the received signal and causing bit errors.

[0021] In one embodiment, the attenuation element 300 includes a support portion 302 and a blocking portion 303. The support portion 302 is connected to the To base 100, and the blocking portion 303 is spaced apart from the lens 103. A second light-transmitting hole 301 is formed on the blocking portion 303.

[0022] In one embodiment, the blocking portion 303 has a blocking slope. This embodiment is configured such that, because the grating sheet is angled, the light reflected back from the detector To chip, after passing through the angled grating sheet, experiences a significant reduction in the amount of light returning to the optical path, thus meeting the return loss performance requirements.

[0023] In one embodiment, the inclination angle of the shielding slope is 30-60°. Specifically, it is preferably 45°.

[0024] In one embodiment, the attenuation element 300 is a grating sheet. Specifically, the grating sheet is made of stainless steel.

[0025] In one embodiment, a strip plate 400 is also included within the To cap 102. The strip plate 400 has at least two through holes 401, and light-blocking plates 402 with different inner diameters are respectively provided in adjacent through holes 401. Specifically, the light-blocking plates 402 are made of opaque material.

[0026] This embodiment is configured in such a way that the diameter of the second light-transmitting hole 301 can be adjusted using light-blocking plates 402 with different inner diameters according to different usage requirements. This allows for adjustment of the amount of incident light focused onto the lens 103 and transmitted to the To chip 101, thus meeting different needs. Specifically, the light-blocking plate 402 corresponding to the required size can be moved to the end of the second light-transmitting hole 301.

[0027] In one embodiment, the light-blocking plate 402 is detachably connected to the strip plate 400. This configuration facilitates the adjustment of the light-blocking plate 402 with different inner diameters according to different needs. Specifically, the light-blocking plate 402 can be connected to the strip plate 400 by screws.

[0028] In one embodiment, the To cap 102 is provided with a support rod 403, the strip plate 400 is slidably connected to the support rod 403, and the length of the strip plate 400 is less than the length of the support rod 403.

[0029] In this embodiment, the support rod 403 is configured to provide stable support for the strip plate 400 and to guide the strip plate 400 when adjusting different light-blocking plates 402 to the second light-transmitting hole 301.

[0030] In one embodiment, the strip plate 400 is provided with an elastic protrusion 4001, and the support rod 403 is provided with an arcuate groove 4031 that cooperates with the elastic protrusion 4001. Specifically, the number of arcuate grooves 4031 is set according to the number of light-blocking plates 402, and the distance between adjacent arcuate grooves 4031 is the same as the distance between two light-blocking plates 402.

[0031] In this embodiment, when different light-blocking plates 402 need to be adjusted, an external force is applied to move the strip plate 400, causing the elastic protrusion 4001 to disengage from the current arc groove 4031. When another light-blocking plate 402 moves to the second light-transmitting hole 301, the elastic protrusion 4001 just contacts the other arc groove 4031, thus positioning the strip plate 400. This also helps personnel determine whether the light-blocking plate 402 has moved into place, reducing the difficulty.

[0032] In one embodiment, the cap 102 has an opening with an openable or removable baffle 1022 at the opening.

[0033] In this embodiment, when it is necessary to adjust the light-blocking plate 402, the baffle 1022 can be opened or removed, and a tool can be inserted into the To cap 102 to push the strip plate 400 to move, thereby moving the appropriate light-blocking plate 402 to the second light-transmitting hole 301.

[0034] Specifically, the baffle 1022 can be opened and connected to the To cap 102 via a hinge, or it can be detachably connected to the To cap 102 via screws.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A photodetector, characterized in that: include, To base (100), on which To chip (101) is provided; To cap (102) is encapsulated on the To base (100). The To cap (102) is encapsulated with a lens (103) for aligning with the To chip (101), and the To cap (102) has a first light-transmitting hole (1021). An adapter (200) is encapsulated outside the To cap (102); An attenuation element (300) is disposed between the To chip (101) and the lens (103) to attenuate the light power entering the To chip (101). The attenuation element (300) is provided with a second light-transmitting hole (301), the diameter of which is smaller than the diameter of the first light-transmitting hole (1021).

2. A photodetector as described in claim 1, characterized in that: The attenuation element (300) includes a support portion (302) and a blocking portion (303). The support portion (302) is connected to the To base (100), and the blocking portion (303) is spaced apart from the lens (103). The second light-transmitting hole (301) is formed on the blocking portion (303).

3. A photodetector as described in claim 2, characterized in that: The shielding part (303) has a shielding slope.

4. A photodetector as described in claim 3, characterized in that: The inclination angle of the shielding slope is 30-60°.

5. A photodetector as described in claim 1, characterized in that: The attenuation element (300) is a grating sheet.

6. A photodetector as described in claim 1, characterized in that: It also includes a strip plate (400) disposed inside the To cap (102), the strip plate (400) having at least two through holes (401), and light-blocking plates (402) with different inner diameters disposed in adjacent through holes (401).

7. A photodetector as described in claim 6, characterized in that: The light-blocking plate (402) is detachably connected to the strip plate (400).

8. A photodetector as described in claim 6, characterized in that: The To cap (102) is provided with a support rod (403), the strip plate (400) is slidably connected to the support rod (403), and the length of the strip plate (400) is less than the length of the support rod (403).

9. A photodetector as described in claim 8, characterized in that: The strip plate (400) is provided with an elastic protrusion (4001), and the support rod (403) is provided with an arc groove (4031) that cooperates with the elastic protrusion (4001).

10. A photodetector as described in claim 6, characterized in that: The To cap (102) has an opening, at which a baffle (1022) is provided that can be opened or removed.

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