Collimating light source assembly and coupling structure of collimating light source assembly and silicon light chip

Abstract

The application discloses a collimating light source assembly and a coupling structure of the collimating light source assembly and a silicon optical chip, and belongs to the technical field of optical communication. The collimating light source assembly comprises a laser, a collimating lens and a base. The laser comprises a first laser, and the collimating lens comprises a first collimating lens. The first laser and the first collimating lens are arranged on the base. The light emitted by the first laser passes through the first collimating lens to form collimated light which is coupled with the silicon optical chip. In the technical scheme provided by the application, the laser and the collimating lens are arranged on the base of the collimating light source assembly, so that the light emitted by the laser passes through the collimating lens to form collimated light, and the collimated light can be coupled with silicon optical chips of different coupling types. The universality of the light source assembly for providing light sources for the silicon optical chip is improved, and the coupling degree between the light source assembly and the silicon optical chip is reduced.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to a collimated light source component and a coupling structure between the collimated light source component and a silicon photonic chip. Background Technology

[0002] Silicon photonics chips offer advantages such as high integration, high bandwidth, and low cost, and are rapidly developing in the fiber optic communication industry as a key component for optical transceivers. However, silicon, the material in silicon photonics chips, is an indirect bandgap semiconductor material and cannot emit light on its own. Therefore, in practical applications, an additional light source needs to be coupled to the silicon photonics chip.

[0003] Based on the type of optical coupling port, silicon photonics chips can be divided into two types: grating-coupled and edge-coupled. Related technologies typically design light source structures for one type of silicon photonics chip. The light source solutions provided by these technologies are only applicable to one type of silicon photonics chip and lack versatility. Summary of the Invention

[0004] This application provides a collimated light source component and a coupling structure between the collimated light source component and a silicon photonic chip, which can reduce the coupling degree between the silicon photonic chip and the light source component and improve the versatility of the light source component corresponding to the silicon photonic chip.

[0005] According to one aspect of the embodiments of this application, a collimated light source assembly is provided. The collimated light source assembly includes a laser, a collimating lens, and a base. The laser includes a first laser, and the collimating lens includes a first collimating lens. The first laser and the first collimating lens are disposed on the base. The light emitted by the first laser passes through the first collimating lens to form collimated light coupled to a silicon photonic chip.

[0006] In one possible design, the collimating light source assembly further includes an isolator, the isolator including a first isolator disposed on the base, and the first laser and the first isolator being located on opposite sides of the first collimating lens.

[0007] In one possible design, the base is provided with an isolator positioning groove, and the isolator is fixedly connected to the base through the isolator positioning groove;

[0008] The isolator positioning slot includes a first isolator positioning slot, through which the first isolator is fixedly connected to the base.

[0009] In one possible design, the base is provided with a lens positioning groove, and the collimating lens is fixedly connected to the base through the lens positioning groove;

[0010] The lens positioning groove includes a first lens positioning groove, through which the first collimating lens is fixedly connected to the base.

[0011] In one possible design, the base is also provided with electrodes, and the laser is connected to the electrodes 16;

[0012] The electrode includes a first electrode, and the first laser is connected to the first electrode.

[0013] In one possible design, the laser further includes a second laser, and the collimating lens further includes a second collimating lens. The second laser and the second collimating lens are disposed on the base. The second laser is a different laser from the first laser, and the second collimating lens is a different collimating lens from the first collimating lens.

[0014] In one possible design, the collimating light source assembly further includes an isolator, the isolator including a second isolator disposed on the base, and the second laser and the second isolator being located on opposite sides of the second collimating lens.

[0015] In one possible design, the collimating light source assembly further includes a cover that covers and is connected to the base. The cover has a light-transmitting sidewall 170 that transmits the collimated light to the outside of the cover, and the inner surface of the light-transmitting sidewall is parallel to the outer surface.

[0016] In one possible design, the inner surface and the outer surface are coated with an optical antireflective film;

[0017] Alternatively, the inner or outer surface may be coated with an optical anti-reflective film.

[0018] According to one aspect of the embodiments of this application, a coupling structure between a collimated light source component and a silicon photonic chip is provided. The coupling structure includes a collimated light source component, a lens, and a silicon photonic chip arranged sequentially along the optical path as described above. The collimated light emitted by the collimated light source component forms a converging light coupled to the silicon photonic chip after passing through the lens.

[0019] In one possible design, the silicon photonics chip includes a side-coupled silicon photonics chip.

[0020] In one possible design, the silicon photonic chip includes a grating-coupled silicon photonic chip, and the coupling structure further includes a mirror that reflects the converging light transmitted from the lens to the grating-coupled silicon photonic chip.

[0021] The technical solution provided in this application can bring the following beneficial effects:

[0022] By placing a laser and a collimating lens on the base of the collimating light source assembly, the light emitted by the laser can be collimated after passing through the collimating lens, and can be coupled with silicon photonic chips of different coupling types. This improves the versatility of the light source assembly that provides light to silicon photonic chips and reduces the degree of coupling between the light source assembly and the silicon photonic chip. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a collimating light source assembly provided in an embodiment of this application. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of a collimating light source assembly provided in an embodiment of this application. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure of a collimating light source assembly provided in an embodiment of this application. Figure 3 ;

[0027] Figure 4 This is a schematic diagram of the structure of a collimating light source assembly provided in an embodiment of this application. Figure 4 ;

[0028] Figure 5 This is a schematic diagram of the structure of a collimating light source assembly provided in an embodiment of this application. Figure 5 ;

[0029] Figure 6 This is a schematic diagram of the coupling structure between a collimated light source component and a silicon photonic chip provided in an embodiment of this application. Figure 1 ;

[0030] Figure 7 This is a schematic diagram of the coupling structure between a collimated light source component and a silicon photonic chip provided in an embodiment of this application. Figure 2 .

[0031] Legend

[0032] 1. Collimating light source assembly;

[0033] 10. Base;

[0034] 11. Laser; 111. First laser; 112. Second laser;

[0035] 12. Collimating lens; 121. First collimating lens; 122. Second collimating lens;

[0036] 13. Isolator; 131. First Isolator; 132. Second Isolator;

[0037] 14. Isolator positioning slot; 141. First isolator positioning slot; 142. Second isolator positioning slot;

[0038] 15. Lens positioning groove; 151. First lens positioning groove; 152. Second lens positioning groove;

[0039] 16. Electrode; 161. First electrode; 1611. First positive electrode; 1612. First negative electrode; 162. Second electrode; 1621. Second positive electrode; 1622. Second negative electrode;

[0040] 17. Lid; 170. Translucent sidewall; 171. Inner surface; 172. Outer surface;

[0041] 2. Lens; 21. First converging lens; 22. Second converging lens;

[0042] 3. Silicon photonics chip; 31. Edge-coupled silicon photonics chip; 32. Grating-coupled silicon photonics chip; 33. Waveguide;

[0043] 4. Reflector. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0045] The background section above describes the application background of the technical solutions provided in the embodiments of this application. Based on the background section, silicon photonics chips can be divided into two types according to the optical coupling port type: grating-coupled and edge-coupled. However, the light source solutions provided by related technologies are only applicable to one type of silicon photonics chip and lack versatility. For example, for edge-coupled silicon photonics chips, related technologies still use spatial light, which has disadvantages such as large size, complex manufacturing process, and high cost. Furthermore, for grating-coupled silicon photonics chips, related technologies often use silicon material light source boxes, but the designed light source boxes can only be used for grating-coupled silicon photonics chips and cannot be used for edge-coupled silicon photonics chips. At the same time, the beam waist position of the output light from these silicon material light source boxes is closely related to the material thickness tolerance, lens surface shape tolerance, and assembly errors of the light source box. Therefore, the consistency of the beam waist position is poor, requiring a large space for adjustment, resulting in a large adhesive layer thickness and affecting product quality.

[0046] Therefore, it is evident that the relevant light source solutions for silicon photonic chips mainly suffer from the following problems:

[0047] 1. Limited application scenarios: It can only be used for either grating-coupled or edge-coupled silicon photonic chips. For silicon photonic chips with different coupling types, it is often necessary to develop a new light source box, which is inefficient, costly, time-consuming, and labor-intensive.

[0048] 2. For edge-coupled silicon photonic chips, the light source solutions of related technologies often adopt spatial optical coupling, which is large in size and has low integration. It cannot be packaged in parallel with the silicon photonic chip, which is not conducive to improving production efficiency and manufacturing yield.

[0049] 3. For light source solutions using grating-coupled silicon photonic chips, small packaging tolerances lead to poor product consistency; or the structure is complex and the size is large.

[0050] To address the aforementioned problems, embodiments of this application provide a collimating light source assembly, such as... Figure 1 As shown, it illustrates the structure of a collimating light source assembly provided in an embodiment of this application. Figure 1 The collimating light source assembly 1 includes a laser 11, a collimating lens 12, and a base 10.

[0051] Laser 11 and collimating lens 12 are mounted on base 10. The light emitted by laser 11 is collimated by collimating lens 12 and then forms a photoelectric effect with silicon photonic chip 3. Figure 1 Collimated light coupled (not shown in the image).

[0052] It should be noted that the type, model, power and other attributes of the laser 11 in this application embodiment are not limited, and the frequency, light intensity and other attributes of the light emitted by the laser 11 are not limited.

[0053] Optionally, the collimating lens 12 is used to collimate the optical signal emitted by the laser 11, and the output light of the laser 11 is transmitted as collimated light after passing through the collimating lens 12.

[0054] Optionally, the collimating lens 12 includes a spherical lens.

[0055] Optionally, the base 10 may be made of silicon or ceramic material. This application embodiment does not limit the material of the base 10.

[0056] Optionally, the laser 11 is fixed to the base 10. Optionally, the laser 11 and the base 10 are fixed together by adhesive material or solder. The method of fixing the laser 11 and the base 10 is not limited in this embodiment.

[0057] Optionally, the coupling type of the silicon photonics chip 3 includes, but is not limited to, grating-coupled and edge-coupled types.

[0058] In one possible implementation, the laser 11 includes a first laser 111, and the collimating lens 12 includes a first collimating lens 121. The first laser 111 and the first collimating lens 121 are disposed on the base 10. The light emitted by the first laser 111 is formed with the silicon photonic chip 3 after passing through the first collimating lens 121. Figure 1 Collimated light coupled (not shown in the image).

[0059] In summary, the technical solution provided by the embodiments of this application, by setting a laser and a collimating lens on the base of the collimating light source component, enables the light emitted by the laser to form collimated light after passing through the collimating lens, and can be coupled with silicon photonic chips of different coupling types, thereby improving the versatility of the light source component that provides light source for silicon photonic chips and reducing the degree of coupling between the light source component and the silicon photonic chip.

[0060] In one possible design, such as Figure 2 As shown, it illustrates the structure of a collimating light source assembly provided in an embodiment of this application. Figure 2 The collimating light source assembly 1 also includes a cover 17, which covers and is connected to the base 10. The cover 17 is provided with a light-transmitting sidewall 170 that transmits collimated light to the outside of the cover 17. The inner surface 171 of the light-transmitting sidewall is parallel to the outer surface 172.

[0061] The collimated light is emitted to the outside through the light-transmitting sidewall 170 of the cover 17. Optionally, the light-transmitting sidewall 170 is made of silicon or glass. Optionally, the light-transmitting sidewall 170 is an inclined sidewall, tilted towards the laser 33. Correspondingly, the inner surface 171 and the outer surface 172 are inclined planes, but still remain parallel. Optionally, the tilt angle of the light-transmitting sidewall 170 is 53 degrees. It should be noted that the tilt angle of the light-transmitting sidewall 170 is not limited in this embodiment. The tilt angle of the light-transmitting sidewall 170 can determine the output position of the collimated light, and can be configured according to actual conditions.

[0062] In one possible design, the inner surface 171 and the outer surface 172 are coated with an optical anti-reflection film; or, either the inner surface 171 or the outer surface 172 is coated with an optical anti-reflection film. The aforementioned optical anti-reflection film is used to reduce Fresnel reflection, thereby reducing losses.

[0063] Alternatively, the lid 17 and the base 10 may be fixed together by an adhesive material (such as glue) or solder.

[0064] In practical applications, for applications requiring airtightness, solder can be used to fix the cover 17 and the base 10 together; that is, in airtight applications, the cover 17 and the base 10 are fixedly connected by solder. For applications where airtightness is not required, the cover 17 and the base 10 are fixedly connected by adhesive material, or as... Figure 1 As shown, the cover 17 is removed. This implementation not only saves costs but also reduces precision requirements. This is because the cover 17 uses collimated light with a large tolerance, so the fixing between the cover 17 and the base 10 does not require high-precision alignment, which helps to improve production efficiency and reduce costs.

[0065] Optionally, the laser 11 and the collimating lens 12 are located within the accommodating space formed by the cover 17 and the base 10.

[0066] In one possible design, such as Figure 3 As shown, it illustrates the structure of a collimating light source assembly provided in an embodiment of this application. Figure 3 The collimating light source assembly 1 also includes an isolator 13, which includes a first isolator 131. The first isolator 131 is disposed on the base 10, and the first laser 111 and the first isolator 131 are respectively located on both sides of the first collimating lens 121.

[0067] The collimated light output from the collimating lens 12 passes through the isolator 13. The isolator 13 prevents the subsequent light from being reflected back to the laser 11, ensuring the stable operation of the laser 11. For applications with minimal reflected light, the isolator 13 can be omitted, as shown in the following example. Figure 1 or Figure 2 As shown.

[0068] Optionally, the isolator 13 is disposed between the collimating lens 12 and the light-transmitting sidewall 170. After passing through the isolator 13, the collimated light continues to pass through the light-transmitting sidewall 170 of the cover 17, thereby achieving external emission.

[0069] In one possible design, such as Figure 3 As shown, the base 10 is provided with an isolator positioning groove 14, and the isolator 13 is fixedly connected to the base 10 through the isolator positioning groove 14.

[0070] Optionally, the base 10 is provided with a positioning groove for placing optical components such as the collimating lens 12 and the isolator 13. The positioning groove includes an isolator positioning groove 14. Optionally, the isolator positioning groove 14 is used to place the isolator 13.

[0071] The isolator positioning groove 14 includes a first isolator positioning groove 141, and the first isolator 131 is fixedly connected to the base 10 through the first isolator positioning groove 141.

[0072] In one possible design, such as Figure 3 As shown, the base 10 is provided with a lens positioning groove 15, and the collimating lens 12 is fixedly connected to the base 10 through the lens positioning groove 15.

[0073] The lens positioning groove 15 includes a first lens positioning groove 151, and the first collimating lens 121 is fixedly connected to the base 10 through the first lens positioning groove 151.

[0074] In one possible design, such as Figure 3 As shown, the base 10 is also provided with an electrode 16, and the laser 11 is connected to the electrode 16.

[0075] The electrode 16 includes a first electrode 161, and the first laser 111 is connected to the first electrode 161.

[0076] Optionally, the base 10 is provided with electrodes 16 for connecting the positive and negative terminals of the laser 11 to provide power.

[0077] In one example, such as Figure 4 As shown, it illustrates the structure of a collimating light source assembly provided in an embodiment of this application. Figure 4 . Figure 4 A kind of Figure 3 The three-dimensional structure of the collimated light source assembly is shown.

[0078] Among them, except Figure 3 In addition to the structure shown, from Figure 4 It can also be seen that the first electrode 161 includes a first positive electrode 1611 and a first negative electrode 1612, which are used to connect the positive electrode and the negative electrode of the first laser 111 respectively (not shown in the figure).

[0079] In one possible design, such as Figure 5 As shown, it illustrates the structure of a collimating light source assembly provided in an embodiment of this application. Figure 5 The laser 11 also includes a second laser 112, and the collimating lens 12 also includes a second collimating lens 122. The second laser 112 and the second collimating lens 122 are disposed on the base 10. The second laser 112 is a different laser than the first laser 111, and the second collimating lens 122 is a different collimating lens than the first collimating lens 121.

[0080] In one possible design, such as Figure 5 As shown, the collimating light source assembly 1 also includes an isolator 13, which includes a second isolator 132. The second isolator 132 is disposed on the base 10, and the second laser 112 and the second isolator 132 are respectively located on both sides of the second collimating lens 122.

[0081] In one possible design, such as Figure 5 As shown, the isolator positioning groove 14 also includes a second isolator positioning groove 142, and the second isolator 132 is fixedly connected to the base 10 through the second isolator positioning groove 142.

[0082] In one possible design, such as Figure 5 As shown, the lens positioning groove 15 also includes a second lens positioning groove 152, and the second collimating lens 122 is fixedly connected to the base 10 through the second lens positioning groove 152.

[0083] In one possible design, such as Figure 5 As shown, electrode 16 also includes a first electrode 162, and the second laser 112 is connected to the second electrode 162.

[0084] The second electrode 162 includes a second positive electrode 1621 and a second negative electrode 1622.

[0085] In one possible implementation, the length of the laser 11 is between 250 and 1000 mm; the collimating lens 12 is a spherical lens with a diameter of 500 μm; and the isolator 13 has an aperture of 750 μm. The dimensions of the base 10 and the cover 17 can be determined based on the dimensions of the laser 11, the collimating lens 12, and the isolator 13, provided that the accommodating space formed by the base 10 and the cover 17 can accommodate the laser 11, the collimating lens 12, and the isolator 13. Optionally, the focal length of the collimating lens 12 is F, and the distance between the laser 11 and the collimating lens 12 is equal to the focal length F.

[0086] In summary, the collimated light source assembly provided in this application embodiment can also be combined in various ways by selecting isolator 13, cover 17 and multi-channel laser 11, so that it can be applied to various practical scenarios, such as reflected light scenarios, airtight scenarios, multi-light source scenarios, etc. It has high configuration flexibility and strong versatility, and the output collimated light can be used as a light source for both edge-coupled and grating-coupled silicon photonic chips, which can reduce development costs and improve development speed.

[0087] This application provides a coupling structure between a collimated light source component and a silicon photonic chip, such as... Figure 6 The diagram illustrates a coupling structure between a collimated light source component and a silicon photonic chip, as provided in an embodiment of this application. Figure 1 .

[0088] The coupling structure includes the collimating light source component 1, the lens 2, and the silicon photonic chip 3 provided in the above embodiment, which are arranged sequentially along the optical path. The collimated light emitted by the collimating light source component 1 forms a converging light coupled with the silicon photonic chip 3 after passing through the lens 2.

[0089] Optionally, lens 2 includes a square lens. This application embodiment does not limit the width, height, or thickness of lens 2. In one possible implementation, lens 2 is a square lens with a width of 750 μm, a height of 1000 mm, and a thickness that can be determined according to the optical design.

[0090] Since the collimating light source component 1 emits collimated light, there is no limitation on the distance between the converging lens 2 and the collimating light source component 1, and the distance can be adjusted according to specific circumstances.

[0091] In one possible design, such as Figure 6 As shown, the silicon photonics chip 3 includes a side-coupled silicon photonics chip 31. Optionally, the silicon photonics chip 3 includes a waveguide 33. Optionally, the waveguide 33 is located on the side of the side-coupled silicon photonics chip 31.

[0092] In one possible design, such as Figure 6 As shown, lens 2 includes a first converging lens 21. Optionally, the first converging lens 21 is a lens corresponding to the edge-coupled silicon photonic chip 31, used to converge the collimated light emitted by the collimating light source assembly 1. Since the optical coupling port of the edge-coupled silicon photonic chip 31 is on the side, and a waveguide 33 is provided thereon, the first converging lens 21 can converge the collimated light onto the waveguide 33 of the edge-coupled silicon photonic chip 31 to realize the transmission of optical signals.

[0093] In one possible implementation, by supplying power to the electrodes 16 on the base 10, the laser 13 enters a light-emitting state, and the collimated light source assembly 1 outputs collimated light. After traveling a certain distance, the light enters the first converging lens 21. The beam between the collimated light source assembly 1 and the first converging lens 21 is collimated light, therefore it is insensitive to the distance between them, which is beneficial to improving packaging flexibility. The first converging lens 21 focuses the collimated light into the waveguide 33 of the edge-coupled silicon photonic chip 31, realizing the coupling between the collimated light source assembly 1 and the edge-coupled silicon photonic chip 31.

[0094] In this embodiment, the collimating light source component 1 does not require position adjustment to achieve active coupling. The collimating light source component 1 can be fixed at a fixed position on the carrier, and the positional tolerance of the collimating light source component 1 relative to the silicon photonic chip 3 is within + / -20µm. Optionally, the collimating light source component 1 can also be fixed to the carrier using adhesives or solders with high thermal conductivity, such as thermally conductive silver paste or gold-tin solder, thereby achieving high-strength fixation while providing better heat dissipation and increasing the lifespan of the laser 11.

[0095] In one possible design, such as Figure 7 The diagram illustrates a coupling structure between a collimated light source component and a silicon photonic chip, as provided in an embodiment of this application. Figure 2 .

[0096] The silicon photonics chip 3 includes a grating-coupled silicon photonics chip 32, and the coupling structure further includes a reflector 4 that reflects the converging light transmitted from the lens 2 to the grating-coupled silicon photonics chip 32. Optionally, the waveguide 33 is located on top of the grating-coupled silicon photonics chip 32.

[0097] In one possible design, such as Figure 7 As shown, lens 2 includes a second converging lens 22. Optionally, the second converging lens 22 is located between the reflector 4 and the collimating light source assembly 1, that is, the second converging lens 22 is located in front of the reflector 4, or the second converging lens 22 is located behind the reflector 4, that is, the second converging lens 22 is located on the other side of the reflector 4 relative to the collimating light source assembly 1.

[0098] and Figure 6 The embodiments shown are different. Figure 7 The coupling structure shown includes a reflector 4, which deflects horizontally transmitted light into the grating coupler of the grating-coupled silicon photonic chip 32 (such as the waveguide 33 disposed on the top of the grating-coupled silicon photonic chip 32). The position of the reflector 4 is not limited in this embodiment; the position of the reflector 4 can be adjusted to allow the converging beam to enter the grating coupler.

[0099] In this implementation, the optical element that deflects the beam angle is the reflector 4. For different types of grating-coupled silicon photonic chips 32, coupling matching can be achieved by adjusting the angle of the reflector 4. The processing cycle is short and the cost is low. This avoids the high investment and long processing cycle caused by redesigning the process flow of the cover 17 and verifying the coupling process, thus improving packaging efficiency.

[0100] In summary, the technical solution provided in this application does not use the method of outputting focused light to design the light source component, but rather uses the method of outputting collimated light to design the light source component, thus obtaining the above-mentioned collimated light source component capable of outputting collimated light. Furthermore, the above-mentioned coupling structure can provide a light source for silicon photonic chips with different coupling types by flexibly configuring reflectors and lenses outside the collimated light source component.

[0101] Secondly, since collimated light has the advantages of high tolerance and long propagation distance, the collimated light source component 1 can be independently fixed at a position far away from the coupler (such as waveguide 33) of the silicon photonic chip 3, resulting in better heat dissipation and higher stability.

[0102] In addition, the collimated light source component 1 has a simple structure, small size, good versatility, and low assembly complexity. Furthermore, it is decoupled from the silicon photonic chip 3 and can be completed in parallel and independently, which is conducive to improving the manufacturing yield and reducing production costs.

[0103] In some implementations, the output light from the laser in the light source box is directly focused by a single converging lens, and after passing through an isolator, a reflector, and a base, it enters the grating coupler of the silicon photonic chip from below the light source box to complete coupling. In this implementation, the output light is directly below the entire light source box, making it suitable only for grating-coupled silicon photonic chips and incompatible with edge-coupled silicon photonic chips. Furthermore, in this implementation, the bonding surface of the light source box is the bottom surface, fixed to the silicon photonic chip surface with adhesive. However, due to variations in material tolerances, lens shape tolerances, and assembly position tolerances, the waist position of the output beam varies significantly between different light source boxes. Therefore, the adhesive layer thickness between the light source box and the silicon photonic chip is inconsistent. A thicker adhesive layer may expand under wide temperature and high humidity conditions, leading to lower coupling efficiency and degraded performance.

[0104] In other implementations, optical components such as lasers, isolators, lenses, and top covers (including mirrors) are all mounted on the silicon photonics chip. High defect rates throughout the assembly and packaging process will result in the scrapping of valuable silicon photonics chips, leading to high costs. In particular, the top cover and silicon photonics chip are fixed by eutectic bonding, requiring heating to over 180 degrees Celsius. At such high temperatures, the position of the top cover also needs to be adjusted to achieve coupling, making the operation very difficult.

[0105] Compared to the two implementation methods described above, the collimating light source component 1 in the above embodiments provided in this application can simultaneously serve as a light source for both edge-coupled silicon photonic chips and grating-coupled silicon photonic chips, outputting collimated light. It has strong versatility, simple structure, and lower requirements for process precision without affecting the coupling effect. Furthermore, the coupling structure between the collimating light source component 1 and the silicon photonic chip 3 has strong independence of each device, low distance requirements between the silicon photonic chip 3 and the collimating light source component 1, and low installation position precision requirements. It is easy to implement and can guarantee the yield rate, effectively avoiding defects caused by directly fixing the silicon photonic chip and the light source component together.

[0106] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A collimated light source assembly for silicon photonic chips, characterized in that, The collimated light source assembly (1) includes: a laser (11), a collimating lens (12), and a base (10). The laser (11) includes a first laser (111), and the collimating lens (12) includes a first collimating lens (121). The first laser (111) and the first collimating lens (121) are disposed on the base (10). The light emitted by the first laser (111) passes through the first collimating lens (121) to form collimated light coupled to the silicon photonic chip (3). The collimating light source assembly (1) also includes a cover (17), which covers and is connected to the base (10). The laser (11) and the collimating lens (12) are located in the accommodating space formed by the cover (17) and the base (10). The cover (17) is provided with a light-transmitting sidewall (170) for transmitting the collimated light to the outside of the cover (17). The inner surface (171) and the outer surface (172) of the light-transmitting sidewall are parallel. The inner surface (171) and the outer surface (172) are inclined relative to the collimated light. The cover (17) is connected to the base (10) at the light-transmitting sidewall (170) through the lower surface of the light-transmitting sidewall (170). The collimated light emitted from the light-transmitting sidewall (170) can be converted into a focused light coupled to the silicon photonic chip (3) after passing through the converging lens. The collimated light source assembly can serve as a light source for both edge-coupled and grating-coupled silicon photonic chips.

2. The collimating light source assembly according to claim 1, characterized in that, The collimating light source assembly (1) further includes an isolator (13), the isolator (13) includes a first isolator (131), the first isolator (131) is disposed on the base (10), and the first laser (111) and the first isolator (131) are respectively located on both sides of the first collimating lens (121).

3. The collimating light source assembly according to claim 2, characterized in that, The base (10) is provided with an isolator positioning groove (14), and the isolator (13) is fixedly connected to the base (10) through the isolator positioning groove (14). The isolator positioning groove (14) includes a first isolator positioning groove (141), and the first isolator (131) is fixedly connected to the base (10) through the first isolator positioning groove (141).

4. The collimating light source assembly according to claim 1, characterized in that, The base (10) is provided with a lens positioning groove (15), and the collimating lens (12) is fixedly connected to the base (10) through the lens positioning groove (15); The lens positioning groove (15) includes a first lens positioning groove (151), and the first collimating lens (121) is fixedly connected to the base (10) through the first lens positioning groove (151).

5. The collimating light source assembly according to claim 1, characterized in that, The base (10) is also provided with an electrode (16), and the laser (11) is connected to the electrode (16); The electrode (16) includes a first electrode (161), and the first laser (111) is connected to the first electrode (161).

6. The collimating light source assembly according to claim 1, characterized in that, The laser (11) further includes a second laser (112), and the collimating lens (12) further includes a second collimating lens (122). The second laser (112) and the second collimating lens (122) are disposed on the base (10). The second laser (112) is a different laser from the first laser (111), and the second collimating lens (122) is a different collimating lens from the first collimating lens (121).

7. The collimating light source assembly according to claim 6, characterized in that, The collimating light source assembly (1) further includes an isolator (13), the isolator (13) includes a second isolator (132), the second isolator (132) is disposed on the base (10), and the second laser (112) and the second isolator (132) are respectively located on both sides of the second collimating lens (122).

8. The collimating light source assembly according to claim 1, characterized in that, The lid (17) and the base (10) are fixed together by adhesive material or solder.

9. The collimating light source assembly according to claim 1 or 8, characterized in that, The inner surface (171) and the outer surface (172) are coated with an optical anti-reflective film; Alternatively, the inner surface (171) or the outer surface (172) may be coated with the optical antireflective film.

10. A coupling structure between a collimated light source component and a silicon photonic chip, characterized in that, The coupling structure includes a collimating light source component (1), a converging lens (2), and a silicon photonic chip (3) arranged sequentially along the optical path as described in any one of claims 1 to 9. The collimated light emitted by the collimating light source component (1) forms a converging light coupled to the silicon photonic chip (3) after passing through the converging lens (2).

11. The coupling structure according to claim 10, characterized in that, The silicon photonic chip (3) includes a side-coupled silicon photonic chip (31).

12. The coupling structure according to claim 10, characterized in that, The silicon photonic chip (3) includes a grating-coupled silicon photonic chip (32), and the coupling structure further includes a reflector (4) that reflects the converging light transmitted by the converging lens (2) to the grating-coupled silicon photonic chip (32).

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