Light receiving end, 1.6 T FR4 optical module and coupling method

Abstract

A collimator is coupled with a light inlet of a Z-block assembly, a 45-degree reflecting prism is arranged on the light outlet side of the Z-block assembly, an array detector is arranged below the reflecting surface of the 45-degree reflecting prism, a second dual-channel array converging lens is coupled between the lower part of the reflecting surface of the 45-degree reflecting prism and a third channel and a fourth channel of the array detector, and a second dual-channel array converging lens is coupled between the lower part of the reflecting surface of the 45-degree reflecting prism and the third channel and the fourth channel of the array detector. A third channel and a fourth channel of the Z-block assembly are coupled with a third channel and a fourth channel of the array detector through the 45-degree reflecting prism and the second dual-channel array converging lens in sequence, and a first channel and a second channel of the Z-block assembly are coupled with a first channel and a second channel of the array detector through the first dual-channel array converging lens and the 45-degree reflecting prism in sequence. A 1.6 T FR4 optical module comprises an optical receiving end. The array detector has the beneficial effects that four channels of the array detector can be simultaneously coupled to the maximum, so that the performance of a light receiving end is ensured, and the yield is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical modules, and in particular to an optical receiving end, a 1.6T FR4 optical module, and a coupling method. Background Art

[0002] In order to ensure the performance of the optical receiving end used in common 1.6T FR4 optical modules, its mainstream solution structure includes: Z-block assembly, four-channel array converging lens, 45° reflecting prism, array detector, collimator, glass capillary and optical fiber. The collimator is coupled with the light input port of the Z-block assembly. The Z-block assembly includes: Z-block and multiple filters fixed on the light output surface of the Z-block in sequence. The collimator is fixed at the end of the glass capillary. The optical fiber coupled with the collimator is fixed in the glass capillary. The external light is coupled into the Z-block assembly through the optical fiber and the collimator in sequence. A 45° reflecting prism is arranged on the light output side of the Z-block assembly. A four-channel array converging lens fixed to the light input side of the 45° reflecting prism by bonding is coupled between the Z-block assembly and the 45° reflecting prism. An array detector is arranged under the reflecting surface of the 45° reflecting prism. The specific structure is as follows: Figure 1 、 Figure 2 As shown, the array detector (optical chip or PD) has four channels, and the Z-block component also has four channels. The wavelengths of light emitted by the four channels of the Z-block component are different. In this solution, due to the high speed, the small photosensitive surface of each channel of the array detector, the Z-block component (Z-block + filter) has processing errors (especially angular errors), and the number of reflections of light in the four channels of the Z-block component is different (channel one has 1 reflection, channel two has 3 reflections, channel three has 5 reflections, and channel four has 7 reflections). As a result, channels one, two, three, and four of some array detectors cannot be coupled to the maximum at the same time, thereby affecting the yield of the optical receiving end. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an optical receiving end, a 1.6T FR4 optical module and a coupling method to overcome the deficiencies in the above-mentioned prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A light receiving end includes: a Z-block assembly and a collimator coupled to a light input port of the Z-block assembly; a 45-degree reflecting prism is arranged on the light output side of the Z-block assembly; an array detector is arranged below the reflecting surface of the 45-degree reflecting prism; a second dual-channel array converging lens is coupled between the reflecting surface of the 45-degree reflecting prism and channels three and four of the array detector; channels three and four of the Z-block assembly are sequentially coupled to channels three and four of the array detector via the 45-degree reflecting prism and the second dual-channel array converging lens; channels one and two of the Z-block assembly are sequentially coupled to channels one and two of the array detector via the first dual-channel array converging lens and the 45-degree reflecting prism.

[0005] The beneficial effect of the present invention is that a four-channel array converging lens is split into two dual-channel array converging lenses and coupled at different positions, so that each corresponds to two channels of the array detector. The principle is as follows: the second dual-channel array converging lens located below the reflecting surface of the 45° reflecting prism has a short focal length, and the first dual-channel array converging lens located between the Z-block assembly and the 45° reflecting prism has a long focal length, thereby changing the focal length of the converging lens compared to a four-channel array converging lens, ensuring that the focus of the corresponding channel can be on the photosensitive surface of each channel of the array detector. Therefore, even if the rate is high, the photosensitive surface of each channel of the array detector is small, there is a processing error in the Z-block assembly 1, and the number of reflections of light in the four channels of the Z-block assembly is different, it can also ensure that channels one, two, three, and four of the array detector can be coupled to the maximum at the same time, thereby ensuring the performance of the light receiving end and greatly improving the yield.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the second dual-channel array converging lens is fixed to the 45-degree reflecting prism by bonding.

[0008] Furthermore, the collimator is fixed on the end of the glass capillary, and the optical fiber coupled with the collimator is fixed in the glass capillary.

[0009] Furthermore, the Z-block assembly includes: a Z-block and a plurality of filters sequentially fixed on the light-emitting surface of the Z-block.

[0010] Furthermore, the collimator is a collimating lens.

[0011] Based on the above technical solution, the present invention further provides a 1.6T FR4 optical module, comprising: two of the above optical receiving ends.

[0012] The above further beneficial effects are: the performance of the 1.6T FR4 optical module can be guaranteed, and the yield rate can be greatly improved.

[0013] Furthermore, the single wavelength of each of the four channels of the optical receiving end is 200G.

[0014] Furthermore, the Z-block assembly, the first dual-channel array converging lens, and the 45° reflecting prism are fixed on the substrate, the substrate is fixed on the PCB board, and the array detector is fixed on the PCB board.

[0015] Based on the above technical solution, the present invention also provides a light receiving end coupling method for coupling the above light receiving end, the steps are as follows: S100, fix the 45° reflecting prism and array detector respectively; S200, using a high-precision placement machine to align the second dual-channel array converging lens with the photosensitive surfaces of channel three and channel four of the array detector, and fix them; S300, connect a galvanometer to each of the four channels of the array detector, couple the collimator and the Z-block assembly, and couple the external light source into the Z-block assembly through the collimator. The light from channels three and four of the Z-block assembly is sequentially coupled into channels three and four of the array detector through a 45° reflecting prism and a second dual-channel array converging lens. Observe the response photocurrents of the galvanometers connected to channels three and four of the array detector. The position of the collimator and Z-block assembly is the optimal coupling position when the response photocurrent is maximum. Secure the collimator and Z-block assembly. S400, couple the first dual-channel array converging lens, and allow the light from channel one and channel two of the Z-block component to be coupled into channel one and channel two of the array detector respectively through the first dual-channel array converging lens and the 45° reflecting prism, observe the response photocurrent of the ammeter connected to channel one and channel two of the array detector, and the position of the first dual-channel array converging lens when the response photocurrent is the maximum is the optimal coupling position, and fix the first dual-channel array converging lens.

[0016] The above further beneficial effects are: convenient coupling, guaranteed performance of the optical receiving end, and greatly improved yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main view of a 1.6T FR4 optical module with an optical receiving end in the prior art; Figure 2 This is a top view of a 1.6T FR4 optical module with an optical receiving end in the prior art; Figure 3 This is a front view of the light receiving end of the present invention; Figure 4 A top view of the light receiving end of the present invention; Figure 5 This is a front view of the 1.6T FR4 optical module with an optical receiving end in the present invention; Figure 6 This is a top view of the 1.6T FR4 optical module including the optical receiving end in the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Z-block assembly, 2. Collimator, 3. 45° reflecting prism, 4. Array detector, 5. Second dual-channel array converging lens, 6. First dual-channel array converging lens, 7. Glass capillary, 8. Optical fiber, 9. Substrate, 10. PCB board. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] Example 1 like Figure 3 、 Figure 4 As shown, a light receiving end includes: a Z-block component 1 and a collimator 2. The collimator 2 is coupled to the light input port of the Z-block component 1. External light can be coupled into the Z-block component 1 through the collimator 2. A 45-degree reflecting prism 3 is arranged on the light output side of the Z-block component 1. An array detector 4 is arranged below the reflecting surface of the 45-degree reflecting prism 3. The array detector 4 has four channels, and the Z-block component 1 also has four channels. That is, the aforementioned technology remains consistent with the existing technology; A second dual-channel array converging lens 5 is coupled between the lower side of the reflecting surface of the 45° reflecting prism 3 and the array detector 4, and the second dual-channel array converging lens 5 is coupled to channel three and channel four of the array detector 4 respectively. Channel three of the Z-block assembly 1 is sequentially coupled to channel three of the array detector 4 via the 45° reflecting prism 3 and the second dual-channel array converging lens 5. Channel four of the Z-block assembly 1 is sequentially coupled to channel four of the array detector 4 via the 45° reflecting prism 3 and the second dual-channel array converging lens 5. A first dual-channel array converging lens 6 is disposed between the Z-block assembly 1 and the 45° reflecting prism 3, and channel 1 of the Z-block assembly 1 is coupled to channel 1 of the array detector 4 via the first dual-channel array converging lens 6 and the 45° reflecting prism 3, and channel 2 of the Z-block assembly 1 is coupled to channel 2 of the array detector 4 via the first dual-channel array converging lens 6 and the 45° reflecting prism 3; Since light is reflected once in channel one of the Z-block assembly 1 and three times in channel two of the Z-block assembly 1, the optical path difference is relatively small. Therefore, the light output from channel one of the Z-block assembly 1 is coupled into channel one of the array detector 4 through the first dual-channel array converging lens 6 and the 45-degree reflecting prism 3 in sequence, and the light output from channel two of the Z-block assembly 1 is coupled into channel two of the array detector 4 through the first dual-channel array converging lens 6 and the 45-degree reflecting prism 3 in sequence. By coupling a single first dual-channel array converging lens 6, the responsiveness of both channel one and channel two of the array detector 4 is maximized. Furthermore, since light is reflected five times in channel three of the Z-block assembly 1 and seven times in channel four of the Z-block assembly 1, the optical path differences are relatively small. Therefore, the light output from channel three of the Z-block assembly 1 is coupled into channel three of the array detector 4 through the 45° reflecting prism 3 and the second dual-channel array converging lens 5 in sequence, and the light output from channel four of the Z-block assembly 1 is coupled into channel four of the array detector 4 through the 45° reflecting prism 3 and the second dual-channel array converging lens 5 in sequence. By separately coupling a second dual-channel array converging lens 5, the responsiveness of channels three and four of the array detector 4 can also be ensured to be maximized at the same time. In the present invention, a four-channel array converging lens is split into two two-channel array converging lenses, which are coupled at different positions so that each corresponds to two channels of the array detector 4. Therefore, even if the rate is high, the photosensitive surface of each channel of the array detector 4 is small, there are processing errors in the Z-block component 1, and the number of times the light is reflected in the four channels of the Z-block component 1 is different, it can also ensure that channels one, two, three, and four of the array detector 4 can be coupled to the maximum at the same time, thereby ensuring the performance of the light receiving end and greatly improving the yield.

[0021] Example 2 like Figure 3 、 Figure 4 As shown, this embodiment is a further improvement on the basis of embodiment 1, specifically as follows: The second dual-channel array converging lens 5 is preferably fixed to the 45° reflecting prism 3 by bonding. Of course, other fixing methods are not excluded in actual application. This is just an exemplary description.

[0022] Furthermore, the collimator 2 is fixed to the end of the glass capillary 7, and the optical fiber 8 coupled to the collimator 2 is fixed in the glass capillary 7. The collimator 2 is preferably a collimating lens.

[0023] The Z-block assembly 1 includes: a Z-block and a plurality of filters, which are sequentially fixed on the light-emitting surface of the Z-block. This part is prior art and will not be described in detail here.

[0024] For Example 1 or 2, in actual application, the optical receiving end further includes: an electrical chip, which is electrically connected to the array detector 4 .

[0025] Example 3 like Figure 5 、 Figure 6 As shown, a 1.6T FR4 optical module includes: two optical receiving ends as in embodiment 1 or 2.

[0026] Furthermore, the single wavelength of each of the four channels of the optical receiving end is 200G, and 200G×4 channels×2 is 1.6T.

[0027] The Z-block assembly 1 , the first dual-channel array converging lens 6 and the 45° reflecting prism 3 are fixed on a substrate 9 , and the substrate 9 is fixed on a PCB board 10 , and the array detector 4 is fixed on the PCB board 10 .

[0028] Example 4 A light receiving end coupling method is used to couple the light receiving end in Embodiment 1 or 2, comprising the following steps: S100, fix the 45° reflecting prism 3 and the array detector 4 respectively; S200, using a high-precision placement machine to align the second dual-channel array converging lens 5 with the photosensitive surface of channel 3 of the array detector 4, and to align the second dual-channel array converging lens 5 with the photosensitive surface of channel 4 of the array detector 4, and fix them. Taking the above embodiment as an example, the second dual-channel array converging lens 5 can be fixed to the 45° reflecting prism 3 by bonding; S300, connect a galvanometer to each of the four channels of the array detector 4, that is, the number of galvanometers is four, couple the collimator 2 and the Z-block assembly 1, and couple the external light source into the Z-block assembly 1 through the collimator 2, so that the light output from channel three of the Z-block assembly 1 is sequentially coupled into channel three of the array detector 4 through the 45° reflecting prism 3 and the second dual-channel array converging lens 5, and the light output from channel four of the Z-block assembly 1 is sequentially coupled into channel four of the array detector 4 through the 45° reflecting prism 3 and the second dual-channel array converging lens 5, observe the response photocurrents of the galvanometers connected to channel three and channel four of the array detector 4, and the positions of the collimator 2 and the Z-block assembly 1 when the response photocurrent is maximum are the optimal coupling positions, and fix the collimator 2 and the Z-block assembly 1 respectively; S400, couple the first dual-channel array converging lens 6, and allow the light output from channel one of the Z-block component 1 to be coupled into channel one of the array detector 4 through the first dual-channel array converging lens 6 and the 45° reflecting prism 3 in sequence, and allow the light output from channel two of the Z-block component 1 to be coupled into channel two of the array detector 4 through the first dual-channel array converging lens 6 and the 45° reflecting prism 3 in sequence, observe the response photocurrents of the ammeters connected to channel one and channel two of the array detector 4, and when the response photocurrent is maximum, the position of the first dual-channel array converging lens 6 is the optimal coupling position, and fix the first dual-channel array converging lens 6.

[0029] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An optical receiving end, characterized in that: include: A Z-block component (1) and a collimator (2) coupled to a light entrance of the Z-block component (1); a 45° reflecting prism (3) is arranged on the light exit side of the Z-block component (1); an array detector (4) is arranged below the reflecting surface of the 45° reflecting prism (3); a second dual-channel array converging lens (5) is coupled between the reflecting surface of the 45° reflecting prism (3) and channel three and channel four of the array detector (4); channel three and channel four of the Z-block component (1) are coupled to channel three and channel four of the array detector (4) in turn through the 45° reflecting prism (3) and the second dual-channel array converging lens (5); channel one and channel two of the Z-block component (1) are coupled to channel one and channel two of the array detector (4) in turn through the first dual-channel array converging lens (6) and the 45° reflecting prism (3).

2. The optical receiving end according to claim 1, wherein: The second dual-channel array converging lens (5) is fixed to the 45° reflecting prism (3) by bonding.

3. The optical receiving end according to claim 1, wherein: The collimator (2) is fixed to the end of a glass capillary (7), and an optical fiber (8) coupled to the collimator (2) is fixed inside the glass capillary (7).

4. An optical receiving end according to claim 1 or 3, characterized in that: The Z-block assembly (1) comprises: a Z-block and a plurality of filters fixed in sequence on the light-emitting surface of the Z-block.

5. The optical receiving end according to claim 1, wherein: The collimator (2) is a collimating lens.

6. A 1.6T FR4 optical module, characterized in that: include: Two optical receiving ends according to any one of claims 1 to 5.

7. The 1.6T FR4 optical module according to claim 6, characterized in that: The single wavelength of each of the four channels of the optical receiving end is 200G.

8. The 1.6T FR4 optical module according to claim 6, characterized in that: The Z-block assembly (1), the first dual-channel array converging lens (6), and the 45° reflecting prism (3) are fixed on a substrate (9), the substrate (9) is fixed on a PCB board (10), and the array detector (4) is fixed on the PCB board (10).

9. A light receiving end coupling method, characterized in that: For coupling the optical receiving end according to any one of claims 1 to 5, the steps are as follows: S100, respectively fixing the 45° reflecting prism (3) and the array detector (4); S200, using a high-precision placement machine to align the second dual-channel array converging lens (5) with the photosensitive surfaces of channel three and channel four of the array detector (4), and fix them; S300, connect a galvanometer to each of the four channels of the array detector (4), couple the collimator (2) and the Z-block assembly (1), and couple the external light source into the Z-block assembly (1) through the collimator (2), and couple the light from the channel three and channel four of the Z-block assembly (1) into the channel three and channel four of the array detector (4) respectively through the 45° reflecting prism (3) and the second dual-channel array converging lens (5), and observe the response photocurrent of the galvanometer connected to the channel three and channel four of the array detector (4). When the response photocurrent is the largest, the position of the collimator (2) and the Z-block assembly (1) is the optimal coupling position, and fix the collimator (2) and the Z-block assembly (1) respectively; S400, coupling the first dual-channel array converging lens (6), and allowing the light from channel 1 and channel 2 of the Z-block component (1) to be coupled into channel 1 and channel 2 of the array detector (4) respectively through the first dual-channel array converging lens (6) and the 45° reflecting prism (3), observing the response photocurrent of the galvanometer connected to channel 1 and channel 2 of the array detector (4), and the position of the first dual-channel array converging lens (6) when the response photocurrent is the maximum is the optimal coupling position, and fixing the first dual-channel array converging lens (6).

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