TO-CAN packaging structure of wave combining laser
By integrating two beams of lasers of different wavelengths in the laser TO-CAN package and realizing optical path combination, the existing laser package cannot meet the problem of miniaturized optical module packaging, and the laser is highly integrated and small-volume design is achieved, which meets the Requirements for optical path wavelength division multiplexing and miniaturization packaging.
Patent Information
- Application Number
- CN202421255064.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The existing laser TO-CAN packages are all single wavelengths and cannot meet the requirements of miniaturized optical module packages, especially in 50GCombo PON applications with multi-optical path integration.
A combined wave laser TO-CAN package structure is designed, and the combined wave of the laser optical path is achieved by integrating two lasers of different wavelengths in the TO-CAN package, and optical components such as collimating lenses and polarization spectroscopy prisms are used to form A light path.
It realizes the highly integrated laser and small-volume design, meets the requirements of optical path wavelength division multiplexing and miniaturized optical devices, while ensuring low energy loss and reliable structure.
Smart Images
Figure CN222515094U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of optical communication, and in particular relates to a TO-CAN packaging structure of a combined-wave laser. Background Art
[0002] TO-CAN packaged semiconductor lasers have the advantages of small size, low energy consumption, long life, mature and reliable process, and suitability for large-scale production. They are widely used in optical fiber communications and optical fiber sensing. In the access network PON optical fiber transmission system, WDM wavelength division multiplexing technology is increasingly used. Optical devices are used for single-fiber bidirectional, single-fiber four-way, and future 50G Combo PON single-fiber six-way integrated transmission. In the application process, they need to be integrated and miniaturized. At present, the main laser TO-CAN packages are all single wavelength, which makes them large in size and complex in optical path structure when used in optical devices, especially in 50G Combo PON with multi-optical path integration, and cannot meet the requirements of miniaturized packaging of optical modules. Utility Model Content
[0003] The utility model aims to overcome the problem that the laser TO-CAN packages in the prior art are all single wavelength and cannot meet the requirements of miniaturized packaging of optical modules when applied to optical devices.
[0004] To this end, the utility model provides a TO-CAN packaging structure of a combined-wave laser, including a TO base, a first laser component, a first optical component, a second laser component, and a second optical component; the first laser component and the second laser are fixed on the TO base; the first optical component is coupled and arranged on the light-emitting optical axis of the first laser component; the second optical component is coupled and arranged on the light-emitting optical axis of the second laser component; the first optical component is located on the reflected light path of the second optical component.
[0005] Specifically, the above-mentioned first optical component includes a first collimating lens and a first polarization beam splitter prism arranged in sequence along the light-emitting axis of the first laser component; the second optical component includes a second collimating lens and a second polarization beam splitter prism arranged in sequence along the light-emitting axis of the second laser component; the wavelength pass-stop bands of the first polarization beam splitter prism and the second polarization beam splitter prism are different; the first polarization beam splitter prism is located on the reflected light path of the second polarization beam splitter prism.
[0006] Specifically, the above-mentioned combined-wave laser TO-CAN packaging structure also includes a tube cap; the tube cap is buckled on the TO base and together with the TO base forms a sealed space; the first laser component, the first optical component, the second laser component, and the second optical component are located in the sealed space.
[0007] Specifically, the cap is a flat window pipe cap.
[0008] Specifically, the TO-CAN packaging structure of the combined-wave laser further includes a backlight detector; the backlight detector is fixed on the TO base.
[0009] Specifically, the TO-CAN packaging structure of the combined-wave laser further includes a cushion block; the cushion block is fixed on the TO base; and the backlight detector is fixed on the cushion block.
[0010] Specifically, the TO-CAN packaging structure of the combined-wave laser further includes a refrigerator; the refrigerator component is fixed on the TO base; the first laser component and the second laser are fixed on the refrigerator.
[0011] Specifically, the TO-CAN packaging structure of the combined-wave laser further includes a substrate; the substrate is fixed on the refrigerator; the first laser component, the first optical component, the second laser component and the second optical component are mounted on the substrate.
[0012] Specifically, the substrate is fixed on the refrigerator by silver glue.
[0013] Specifically, the TO base is provided with a plurality of TO pins; the plurality of TO pins are respectively connected to corresponding optical elements on the TO base through bonding gold wires.
[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0015] The TO-CAN packaging structure of the combined-wavelength laser provided by the utility model realizes the integrated packaging and combining of two laser beams with different wavelengths into one optical path on the TO-CAN package. The structure is highly integrated. On the premise of ensuring low energy loss of the optical path and reliable structure, a small volume design is carried out to meet the requirements of wavelength division multiplexing of the optical path and miniaturized packaging of optical devices.
[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The utility model is a schematic diagram of the TO-CAN packaging structure of the combined-wave laser provided by the utility model.
[0018] Figure 2 It is a schematic diagram of the first viewing angle of the optical device installation structure in the TO-CAN packaging structure of the combined-wave laser provided by the utility model.
[0019] Figure 3 It is a schematic diagram of the second viewing angle of the optical device installation structure in the TO-CAN packaging structure of the combined-wave laser provided by the utility model.
[0020] Figure 4 It is a schematic diagram of the optical path of the first optical component in the utility model.
[0021] Figure 5 It is a schematic diagram of the optical path of the second optical component in the utility model.
[0022] Figure 6 It is a schematic diagram of the optical path of the TO-CAN packaging structure of the combined-wave laser.
[0023] Explanation of the reference numerals: 1. TO base; 2. tube cap; 3. first laser assembly; 4. first optical assembly; 401. first collimating lens; 402. first polarization beam splitter prism; 5. second laser assembly; 6. second optical assembly; 601. second collimating lens; 602. second polarization beam splitter prism; 7. substrate; 8. refrigerator; 9. spacer; 10. backlight detector; 11. TO pin; 12. RF substrate. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.
[0027] Reference Figure 1-3The utility model provides a TO-CAN packaging structure of a combined wave laser, comprising a TO base 1, a first laser component 3, a first optical component 4, a second laser component 5, and a second optical component 6; the first laser component 3 and the second laser are fixed on the TO base 1; the first optical component 4 is coupled and arranged on the light-emitting optical axis of the first laser component 3; the second optical component 6 is coupled and arranged on the light-emitting optical axis of the second laser component 5; the first optical component 4 is located on the reflected light path of the second optical component 6, and the light outlet of the packaging structure matches the first optical component 4. The TO base 1 is used as a carrier for fixing various related optical components, and is preferably designed for impedance matching simulation to ensure the transmission matching and transmission quality of the laser signal. During packaging, the first laser component 3 and the second laser are fixed on the TO base 1, and the light-emitting surfaces of the two groups of laser components are preferably at the same horizontal position, which is conducive to ensuring the consistency of the subsequent optical component coupling and fixing positions. Then, according to the light-emitting optical axes of the first laser component 3 and the second laser, the first optical component 4 and the second optical component 6 are coupled in sequence, and the first optical component 4 is located on the reflected light path of the second optical component 6. When in use, the divergent light emitted by the first laser component 3 is converted into parallel light by the first optical component 4 and transmitted and emitted, and the divergent light emitted by the second laser component 5 is converted into parallel light by the second optical component 6 and reflected to the first optical component 4, and merged with the light emitted by the first laser component 3. The optical components collimate, transmit and reflect the light path to achieve the combination of two different laser wavelengths. The first laser component 3 and the second laser component 5 are selected according to actual needs, and a laser COC component can be selected, and the laser chip model is preferably DFB, EML or any other feasible model.
[0028] Specifically, the first optical component 4 includes a first collimating lens 401 and a first polarization beam splitter prism 402 arranged in sequence along the light-emitting axis of the first laser component 3; the second optical component 6 includes a second collimating lens 601 and a second polarization beam splitter prism 602 arranged in sequence along the light-emitting axis of the second laser component 5; the first polarization beam splitter prism 402 and the second polarization beam splitter prism 602 have different wavelength pass-bands; the first polarization beam splitter prism 402 is located on the reflection light path of the second polarization beam splitter prism 602. Preferably, the first collimating lens 401 and the second collimating lens 601 are located in the same horizontal plane, and the first polarization beam splitter prism 402 and the second polarization beam splitter prism 602 are located in the same horizontal plane and are parallel to each other. Figure 4-6As shown, the divergent light emitted by the first laser assembly 3 is converted into parallel light by the first collimating lens 401 and then transmitted through the first polarization beam splitter prism 402. The divergent light emitted by the second laser assembly 5 is converted into parallel light parallel to the light beam passing through the first collimating lens 401 by the second collimating lens 601, then reflected at 45° to the first polarization beam splitter prism 402 by the second polarization beam splitter prism 602, and then reflected at 45° by the first polarization beam splitter prism 402 and then emitted, and combined with the light emitted by the first laser assembly 3.
[0029] It is feasible that the optical components are all integrated and processed by a collimating lens (silicon lens) and a polarization beam splitter prism (PBS), which converts the laser light into parallel light with a small spot, facilitates optical path transmission and wavelength division multiplexing, and reduces energy loss. The length and width of the outer diameter of the silicon lens and the PBS are consistent, ensuring the position consistency of the two sets of optical components and small size packaging. The first polarization beam splitter prism 402 and the second polarization beam splitter prism 602 are selected according to the actual optical path, and the film structure coated with the bevel is designed as needed to ensure that the light of the second polarization beam splitter prism 602 is reflected to the first polarization beam splitter prism 402, and can be combined with the light emitted by the first laser component 3.
[0030] The wavelength pass-stop band includes a cut-off band and a pass-band. Preferably, the cut-off band wavelength range of the first polarization beam splitter is 850nm to 1650nm, and the pass-band wavelength range is 850nm to 1650nm; the second polarization beam splitter is used for light path reflection, and the cut-off band wavelength range of the second polarization beam splitter is 850nm to 1650nm. Optionally, the pass-band and the stop-band wavelength interval is 20nm.
[0031] In order to ensure the reliability of TO-CAN, the combined-wave laser TO-CAN packaging structure also includes a tube cap 2; the tube cap 2 is buckled on the TO base 1 and enclosed with the TO base 1 to form a sealed space; the first laser component 3, the first optical component 4, the second laser component 5, and the second optical component 6 are located in the sealed space. The tube cap 2 is used for airtight sealing of TO-CAN to prevent other gases such as water vapor outside the TO-CAN from entering the inside of the TO-CAN and affecting the laser performance. The tube cap 2 is preferably a flat window tube cap 2, coated with an anti-reflection film to improve the transmittance of the combined-wave beam.
[0032] In an optimized implementation, the combined-wave laser TO-CAN packaging structure further includes a backlight detector 10 for monitoring the laser backlight current; the backlight detector 10 is fixed on the TO base 1 and can monitor the laser light emission in real time, facilitating product performance debugging.
[0033] Furthermore, the backlight detector 10 is fixed on the TO base 1 through the pad 9, and the position height of the backlight detector 10 is adjusted through the pad 9 to facilitate packaging and wiring. The pad 9 is preferably a ceramic pad 9.
[0034] In a detailed implementation, the combined-wave laser TO-CAN packaging structure further includes a refrigerator 8, preferably a TEC refrigerator 8; the refrigerator 8 is fixed on the TO base 1; the first laser component 3 and the second laser component 5 are fixed on the refrigerator 8. The refrigerator 8 is used to control the operating temperature of the laser TO-CAN, so that the laser emits light at a certain temperature, and ensures that the laser wavelength is within the operating range and does not change with changes in ambient temperature.
[0035] Furthermore, the TO-CAN packaging structure of the combined-wave laser further includes a substrate 7; the substrate 7 is fixed on the refrigerator 8; the first laser component 3, the first optical component 4, the second laser component 5 and the second optical component 6 are mounted on the substrate 7. The substrate 7 preferably adopts an aluminum nitride substrate 7 with the characteristics of light weight and easy processing, which can reduce the stress on the refrigerator 8 and improve the product stability.
[0036] Optionally, the substrate 7 is fixed to the refrigerator 8 by silver glue, the first laser component 3 and the second laser component 5 are fixed to the substrate 7 by silver glue, and the first optical component 4 and the second optical component 6 are fixed to the substrate 7 by UV glue coupling. Silver glue has thermal conductivity, which is convenient for temperature control of the refrigerator 8 and heat dissipation of the product, and the shear force, push-off force and reliability of the glue meet industry requirements. The UV glue is cured by ultraviolet light irradiation, which is convenient for coupling and fixing of optical components, ensuring the stability of the combined beam and the ease of operation of the package.
[0037] The TO base 1 is provided with a plurality of TO pins 11 ; the plurality of TO pins 11 are respectively connected to the corresponding optical component circuits on the TO base 1 through bonding gold wires, so as to facilitate product performance debugging. The number of TO pins 11 is designed according to the number of optical devices on the TO base 1 .
[0038] A radio frequency substrate 12 is also provided on the TO base 1 to ensure the signal transmission quality of the laser and product performance.
[0039] Embodiment 1:
[0040] The present embodiment provides a TO-CAN packaging structure of a combined-wave laser, including a TO base 1, a tube cap 2, a radio frequency substrate 12, an aluminum nitride substrate 7, a first laser component 3, a first optical component 4, a second laser component 5, a second optical component 6, a backlight detector 10, a ceramic pad 9, and a TEC cooler 8.
[0041] The TO base 1 is designed for impedance matching simulation to ensure the transmission matching and transmission quality of the laser signal.
[0042] The RF substrate 12, the ceramic pad 9, and the TEC cooler 8 are respectively fixed on the upper surface of the TO base 1; the backlight detector 10 is fixed on the ceramic pad 9; the aluminum nitride substrate 7 is fixed on the TEC cooler 8; the first laser component 3 and the second laser component 5 are symmetrically fixed on the aluminum nitride substrate 7, and the light-emitting surfaces of the two groups of laser components are at the same horizontal position.
[0043] The first optical component 4 includes a first collimating lens 401 and a first polarization beam splitter prism 402 with the same outer diameter, length and width; the first collimating lens 401 and the first polarization beam splitter prism 402 are arranged in sequence along the light-emitting optical axis of the first laser component 3; the second optical component 6 includes a second collimating lens 601 and a second polarization beam splitter prism 602 with the same outer diameter, length and width; the second collimating lens 601 and the second polarization beam splitter prism 602 are arranged in sequence along the light-emitting optical axis of the second laser component 5. The first collimating lens 401 and the second collimating lens 601 are located in the same horizontal plane, and the light transmitted through the first collimating lens 401 and the second collimating lens 601 are parallel to each other; the first polarization beam splitter 402 and the second polarization beam splitter 602 are located in the same horizontal plane, and are parallel to each other; the cutoff band wavelength range of the first polarization beam splitter is 1480 to 1500 nm, and the passband wavelength range is 1575 to 1580 nm; the second polarization beam splitter is used for light path reflection, and the cutoff band wavelength range of the second polarization beam splitter is 1480 to 1500 nm.
[0044] A plurality of TO pins 11 are disposed on the TO base 1, and each TO pin 11 is insulated and fixed on the TO base 1; the upper end of the TO pin 11 protrudes from the upper surface of the TO base 1. Each optical device on the TO base 1 is bonded to the TO pin 11 by gold wire.
[0045] The tube cap 2 is a flat window tube cap 2 coated with an anti-reflection film; the tube cap 2 is buckled on the TO base 1 to form a sealed space together with the TO base 1, and it and the device are both located in the sealed space, and the light outlet of the tube cap 2 matches the first optical component 4.
[0046] The TO-CAN packaging structure of the combined-wave laser provided in this embodiment is packaged by the following steps:
[0047] 1. Use silver glue to fix the ceramic pad 9 and the TEC cooler 8 on the upper surface of the TO base 1 respectively;
[0048] 2. Fix the aluminum nitride substrate 7 on the TEC cooler 8 with silver glue; fix the backlight detector 10 on the ceramic pad 9 with silver glue;
[0049] 3. Use silver glue to fix the first laser component 3 and the second laser component 5 on the appropriate position of the aluminum nitride substrate 7;
[0050] 4. Use gold wire to connect TO pin 11 to each optical component;
[0051] 5. Use ultraviolet glue to couple and fix the first optical component 4 and the second optical component 6 on the aluminum nitride substrate 7 respectively;
[0052] 6. The cap 2 is welded to the TO base 1 by resistance welding to form a TO package. During this process, the water vapor and oxygen inside the package space are evacuated to enhance the anti-corrosion performance, ensure the airtightness of the TO package structure, and improve the stability and reliability of the product.
[0053] Reference Figure 4-6 The divergent light emitted by the first laser assembly 3 is converted into parallel light by the first collimating lens 401 and then transmitted through the first polarization beam splitter prism 402. The divergent light emitted by the second laser assembly 5 is converted into parallel light parallel to the light beam passing through the first collimating lens 401 by the second collimating lens 601, then reflected at 45° to the first polarization beam splitter prism 402 by the second polarization beam splitter prism 602, then reflected at 45° by the first polarization beam splitter prism 402 and then emitted, combined with the light emitted by the first laser assembly 3 and emitted through the tube cap 2.
[0054] The TO-CAN packaging structure of the combined-wavelength laser provided by the utility model is highly integrated, and realizes the integrated packaging and combining of two laser beams with different wavelengths into one optical path. Under the premise of ensuring low energy loss of the optical path and reliable structure, a small volume design is carried out through optical simulation, which meets the requirements of wavelength division multiplexing of the optical path and miniaturization of optical devices.
[0055] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.
Claims
1. A TO-CAN packaging structure for a combined-wave laser, characterized in that: The invention comprises a TO base (1), a first laser assembly (3), a first optical assembly (4), a second laser assembly (5), and a second optical assembly (6); the first laser assembly (3) and the second laser assembly (5) are fixed on the TO base (1); the first optical assembly (4) is coupled and arranged on the light output axis of the first laser assembly (3); the second optical assembly (6) is coupled and arranged on the light output axis of the second laser assembly (5); and the first optical assembly (4) is located on the reflected light path of the second optical assembly (6).
2. The TO-CAN packaging structure of the combined-wave laser according to claim 1, characterized in that: The first optical component (4) comprises a first collimating lens (401) and a first polarization beam splitter prism (402) which are sequentially arranged along the light-emitting axis of the first laser component (3); the second optical component (6) comprises a second collimating lens (601) and a second polarization beam splitter prism (602) which are sequentially arranged along the light-emitting axis of the second laser component (5); the first polarization beam splitter prism (402) and the second polarization beam splitter prism (602) have different wavelength pass-bands; and the first polarization beam splitter prism (402) is located on the reflection light path of the second polarization beam splitter prism (602).
3. The TO-CAN packaging structure of the combined-wave laser according to claim 1, characterized in that: It also comprises a tube cap (2); the tube cap (2) is buckled onto the TO base (1) and forms a sealed space together with the TO base (1); the first laser component (3), the first optical component (4), the second laser component (5), and the second optical component (6) are located in the sealed space.
4. The TO-CAN packaging structure of the combined-wave laser according to claim 3, characterized in that: The pipe cap (2) is a flat window pipe cap (2).
5. The TO-CAN packaging structure of the combined-wave laser according to claim 1, characterized in that: It also comprises a backlight detector (10); the backlight detector (10) is fixed on the TO base (1).
6. The TO-CAN packaging structure of the combined-wave laser according to claim 5, characterized in that: It also comprises a cushion block (9); the cushion block (9) is fixed on the TO base (1); and the backlight detector (10) is fixed on the cushion block (9).
7. The TO-CAN packaging structure of the combined-wave laser according to claim 1, characterized in that: It also comprises a refrigerator (8); the refrigerator (8) is fixed on the TO base (1); the first laser component (3) and the second laser component (5) are fixed on the refrigerator (8).
8. The TO-CAN packaging structure of the combined-wave laser according to claim 7, characterized in that: It also comprises a substrate (7); the substrate (7) is fixed on the refrigerator (8); the first laser component (3), the first optical component (4), the second laser component (5) and the second optical component (6) are mounted on the substrate (7).
9. The TO-CAN packaging structure of the combined-wave laser according to claim 8, characterized in that: The substrate (7) is fixed on the refrigerator (8) by means of silver glue.
10. The TO-CAN packaging structure of the combined-wave laser according to claim 1, characterized in that: The TO base (1) is provided with a plurality of TO pins (11); the plurality of TO pins (11) are respectively connected to corresponding optical elements on the TO base (1) via bonding gold wires.