Four-path integrated narrow linewidth laser module

Abstract

The utility model discloses a four-path integrated narrow linewidth laser module, which belongs to the field of lasers, and is characterized in that a circuit board, a four-path integrated laser, an optical fiber disc, a polarization-maintaining wavelength division multiplexer and a polarization-maintaining isolator adopt a laminated structure design, so that the structure is more compact; through the main heat dissipation table, the auxiliary heat dissipation table and the heat conduction material between the main heat dissipation table and the auxiliary heat dissipation table, heat dissipation of all heating devices can be better achieved, and the overall stability is improved. The device mainly comprises an upper shell and a lower shell, a circuit board is installed in the lower shell, an optical fiber disc is further installed in the lower shell, the optical fiber disc is located above the circuit board, a four-way integrated laser is arranged on the lower shell, the four-way integrated laser penetrates through the circuit board and an opening in the middle of the optical fiber disc, and the four-way integrated laser is connected with the circuit board. A plurality of vertical plates are arranged on the periphery of the optical fiber disc, and a polarization-maintaining isolator and a plurality of polarization-maintaining wavelength division multiplexers are arranged through the vertical plates. The four-path integrated narrow linewidth laser is mainly used for highly integrated four-path integrated narrow linewidth lasers.

Description

Technical Field

[0001] This utility model relates to the field of lasers, and more specifically, to a four-channel integrated narrow linewidth laser module. Background Technology

[0002] Most existing products use single-channel lasers. To create a four-channel laser module, four single-channel lasers are needed, resulting in low integration, large size, and complex assembly and maintenance. When manufacturing multi-channel laser modules, either a separate circuit is designed for each laser, leading to numerous components, large size, and high cost; or the circuit is designed as a single unit, with multiple lasers placed in the middle or around the circuit board. This design requires fiber coiling on the circuit board, making it difficult to physically separate the circuit and optical paths, leading to mutual interference and making maintenance difficult. For example, CN104466640A describes a full-fiber frequency up-conversion seed light system for sodium lidar, which provides a technical solution for combining two wavelength lasers for output. However, existing technology still cannot separate the circuit and optical paths within a very small space and combine four different wavelength lasers into a single output, requiring a redesign of the housing and internal structure. Utility Model Content

[0003] The purpose of this invention is to provide a four-channel integrated narrow-linewidth laser module. Its circuit board, four integrated lasers, fiber optic disk, polarization-maintaining wavelength division multiplexer, and polarization-maintaining isolator are designed in a stacked structure, resulting in a more compact structure. Through the main heat sink, auxiliary heat sink, and the thermally conductive material between them, each heat-generating component can be better cooled, improving overall stability. The circuitry and optical path are completely separated, minimizing mutual interference. During maintenance, the circuitry or optical path can be replaced individually, simplifying the operation.

[0004] This utility model is achieved through the following technical solution:

[0005] A four-channel integrated narrow-linewidth laser module includes an upper housing and a lower housing. A circuit board is installed inside the lower housing, and an optical fiber tray is also installed inside the lower housing, located above the circuit board. Four integrated lasers are positioned in the middle of the lower housing, passing through an opening between the circuit board and the optical fiber tray. The four integrated lasers are connected to the circuit board. Several vertical plates are arranged around the optical fiber tray, through which polarization-maintaining isolators and several polarization-maintaining wavelength division multiplexers are installed. The four integrated lasers are combined through the several polarization-maintaining wavelength division multiplexers, and the combined optical paths are then connected to the polarization-maintaining isolators. The polarization-maintaining isolators are connected to pigtails. One end of the pigtail is installed at the fiber outlet on the side of the lower housing, and the other end of the pigtail is equipped with an FC / APC connector to output laser light. The optical fiber can be wound between the vertical plates for easy wiring.

[0006] Furthermore, the aforementioned polarization-maintaining wavelength division multiplexers include polarization-maintaining wavelength division multiplexer I, polarization-maintaining wavelength division multiplexer II, and polarization-maintaining wavelength division multiplexer III. Interfaces one and two of the four-channel integrated laser are connected to polarization-maintaining wavelength division multiplexer I, interface three of the four-channel integrated laser and polarization-maintaining wavelength division multiplexer I are connected to polarization-maintaining wavelength division multiplexer II, interface four of the four-channel integrated laser and polarization-maintaining wavelength division multiplexer II are connected to polarization-maintaining wavelength division multiplexer III, and polarization-maintaining wavelength division multiplexer III is connected to a polarization-maintaining isolator.

[0007] Furthermore, a main heat dissipation platform is provided in the middle of the lower housing, and four integrated lasers are installed and fixed on the main heat dissipation platform. The gap between the four integrated lasers and the main heat dissipation platform is filled with thermally conductive material.

[0008] Furthermore, the lower housing is provided with a boss one, and a number of auxiliary heat dissipation platforms are provided around the lower housing. The circuit board is mounted and fixed on the boss one. The position of the temperature control chip on the circuit board corresponds to the position of the number of auxiliary heat dissipation platforms. Thermally conductive material is filled between the temperature control chip and the auxiliary heat dissipation platforms. The lower housing also includes a boss two and a boss three, which are used to install the fiber optic disk.

[0009] Furthermore, the upper shell is provided with a square-shaped reinforcing rib around its perimeter, with a notch reserved in the square-shaped reinforcing rib to allow the optical fiber to pass through the fiber outlet; a grid-shaped reinforcing rib is also provided in the middle of the upper shell.

[0010] Furthermore, the polarization-maintaining isolator and several polarization-maintaining wavelength division multiplexers are all fixed between the fiber optic tray and the vertical plate with adhesive.

[0011] Furthermore, the circuit board includes a microcontroller and four LD constant current sources. The microcontroller is connected to 16 ADCs and 8 DACs respectively. The microcontroller is also connected to a connector via an RS485 chip, and the connector is connected to a power module. The 16 ADCs are connected to 4 TIAs, the four LD constant current sources, four integrated lasers, and an onboard NTC respectively. The four integrated lasers are connected to the four TIAs, and the eight DACs are connected to the four LD constant current sources. The eight DACs are connected to the four integrated lasers via four temperature control circuits, and the four LD constant current sources are connected to the four integrated lasers.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. It adopts a four-channel integrated laser and uses 8 DACs, 16 ADCs and 4 TIAs in the circuit. Its highly integrated design makes the originally complex four-channel laser module simple, concise and small in size. The circuit board, four-channel integrated laser, fiber disk, polarization-maintaining wavelength division multiplexer and polarization-maintaining isolator adopt a stacked structure design, which also makes the structure more compact.

[0014] 2. Completely separate the circuit and optical path to minimize mutual interference; during maintenance, the circuit or optical path can be replaced individually, making the operation simple.

[0015] 3. Through the main heat sink and auxiliary heat sink and the thermally conductive material in between, each heat-generating component can dissipate heat better, thus improving the overall stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is an exploded view of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the lower shell of this utility model;

[0020] Figure 5 This is a schematic diagram of the upper shell of this utility model;

[0021] Figure 6 This is a schematic diagram showing the connection between each polarization-maintaining wavelength division multiplexer and the four-channel integrated laser of this utility model;

[0022] Figure 7 This is the circuit schematic diagram of this utility model.

[0023] In the diagram: 1. Upper housing; 2. Fiber optic tray; 3. Four-channel integrated laser; 4. Circuit board; 5. Lower housing; 6. Pigtail; 7. Polarization-maintaining wavelength division multiplexer I; 8. Polarization-maintaining isolator; 9. U-shaped reinforcing rib; 10. Grid-shaped reinforcing rib; 11. Auxiliary heat sink; 12. Main heat sink; 13. Vertical plate; 14. Polarization-maintaining wavelength division multiplexer II; 15. Polarization-maintaining wavelength division multiplexer III; 16. Boss II; 17. Boss I; 18. Boss III. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1 – Figure 3As shown, a four-channel integrated narrow-linewidth laser module includes an upper housing 1 and a lower housing 5. A circuit board 4 is installed inside the lower housing 5, and an optical fiber tray 2 is also installed inside the lower housing 5, located above the circuit board 4. Four integrated lasers 3 are located in the middle of the lower housing 5. The four integrated lasers 3 pass through an opening in the middle of the circuit board 4 and the optical fiber tray 2, and are connected to the circuit board 4. Several vertical plates 13 are arranged around the optical fiber tray 2. Polarization-maintaining isolators 8 and several polarization-maintaining wavelength division multiplexers are arranged through the vertical plates 13. The four integrated lasers 3 are combined through the several polarization-maintaining wavelength division multiplexers, and the combined optical paths are then connected to the polarization-maintaining isolators 8. The polarization-maintaining isolators 8 are connected to pigtails 6. One end of the pigtail 6 is installed at the fiber outlet on the side of the lower housing 5, and the other end of the pigtail 6 is equipped with an FC / APC connector to output laser light outward. The optical fiber can be wound between the vertical plates 13 for easy wiring. The circuit board 4, the four-channel integrated laser 3, the fiber disk 2, the polarization-maintaining wavelength division multiplexer and the polarization-maintaining isolator 8 adopt a stacked structure design, which makes the structure more compact.

[0027] Example 2

[0028] A four-channel integrated narrow-linewidth laser module, comprising several polarization-maintaining wavelength division multiplexers (PMD-DMLs) including PMD-DML I7, PMD-DML II14, and PMD-DML III15. Interfaces one and two of the four integrated lasers 3 are connected to PMD-DML I7; interface three of the four integrated lasers 3 and PMD-DML I7 are connected to PMD-DML II14; interface four of the four integrated lasers 3 and PMD-DML II14 are connected to PMD-DML III15; and PMD-DML III15 is connected to a polarization-maintaining isolator 8. Figure 6 As shown, the interfaces 1-4 of the four-channel integrated laser 3 are illustrated using wavelengths C31, C32, C33, and C34 respectively: First, polarization-maintaining wavelength division multiplexer I7 combines C31 and C32 into one channel; then, polarization-maintaining wavelength division multiplexer II14 combines C33 into the optical path; finally, polarization-maintaining wavelength division multiplexer III15 combines C34 into the optical path. Figure 7 As shown, the circuit board 4 includes a microcontroller and four LD constant current sources. The microcontroller is connected to 16 ADCs and 8 DACs respectively. The microcontroller is also connected to a connector via an RS485 chip, and the connector is connected to a power module. The 16 ADCs are connected to 4 TIAs, four LD constant current sources, four integrated lasers 3, and an onboard NTC respectively. The four integrated lasers 3 are connected to the four TIAs. The 8 DACs are connected to the four LD constant current sources. The 8 DACs are connected to the four integrated lasers 3 via four temperature control circuits. The four LD constant current sources are connected to the four integrated lasers 3. The rest is the same as in Embodiment 1.

[0029] The four-channel integrated laser 3 can generate four continuous wavelength lasers (e.g., C31, C32, C33, C34), with each laser output from a separate optical fiber. The four-channel integrated laser 3 has 32 pins soldered onto the circuit board 4. The four-channel integrated laser 3 can emit all four lasers simultaneously, or it can emit any one, two, or three of them individually.

[0030] Example 3

[0031] like Figure 4 – Figure 5 As shown, a four-channel integrated narrow linewidth laser module is disclosed. A main heat sink 12 is located in the middle of the lower housing 5, and four integrated lasers 3 are mounted and fixed on the main heat sink 12. The gap between the four integrated lasers 3 and the main heat sink 12 is filled with thermally conductive material. A boss 17 is provided on the lower housing 5, and several auxiliary heat sinks 11 are provided around the lower housing 5. A circuit board 4 is mounted and fixed on the boss 17. The position of the temperature control chip on the circuit board 4 corresponds to the position of the auxiliary heat sinks 11. The space between the heat dissipation platforms 11 is filled with thermally conductive material, and also includes a second boss 16 and a third boss 18 on the lower housing 5. The second boss 16 and the third boss 18 are used to install the fiber optic tray 2. The upper housing 1 is provided with a U-shaped reinforcing rib 9 around its perimeter. The U-shaped reinforcing rib 9 has a pre-reserved notch to allow the fiber to pass through the fiber outlet. The upper housing 1 is also provided with a cross-shaped reinforcing rib 10 in the middle position. The polarization maintaining isolator 8 and several polarization maintaining wavelength division multiplexers are fixed between the fiber optic tray 2 and the vertical plate 13 with glue. The rest is the same as in embodiment 1.

[0032] The quad-channel integrated laser 3 internally contains four LDs, four TECs, four NTCs, and four PDs. The microcontroller controls 8 DACs and 16 ADCs via an SPI interface. The 8 DACs control the four LD constant current sources and four temperature control circuits. The 16 ADCs collect data from the output voltages of 4 TIAs, the four LD constant current sources, the four NTCs within the quad-channel integrated laser 3, and the onboard NTC. The 4 TIAs convert the current output from the four PDs within the quad-channel integrated laser 3 into voltage signals. The onboard NTC monitors the temperature of the entire module. An RS485 chip connects the microcontroller to a connector, which serves as the power input and communication interface for the entire module, introducing external power supply VCC1 into the power module. The power module uses several LDO power chips to step down VCC1, generating at least three independent new power supplies: VCC2 powers the temperature control circuit; VCC3 provides a reference voltage for the ADCs and DACs; and VCC4 powers the microcontroller and other circuits. The voltage values ​​of VCC2-VCC4 can be the same or different. The specific structures of the above-mentioned 8-channel DAC, 16-channel ADC, four LD constant current sources, four temperature control circuits and 4-channel TIA are all existing technologies and will not be described in detail.

Claims

1. A four-channel integrated narrow linewidth laser module, comprising an upper housing (1) and a lower housing (5), wherein a circuit board (4) is installed inside the lower housing (5), characterized in that: The lower housing (5) is also equipped with an optical fiber disk (2), which is located above the circuit board (4). The lower housing (5) is equipped with four integrated lasers (3). The four integrated lasers (3) pass through the opening between the circuit board (4) and the optical fiber disk (2). The four integrated lasers (3) are connected to the circuit board (4). Several vertical plates (13) are provided around the optical fiber disk (2). A polarization-maintaining isolator (8) and several polarization-maintaining wavelength division multiplexers are provided through the vertical plates (13). The four integrated lasers (3) are combined through several polarization-maintaining wavelength division multiplexers. After the optical paths are combined, they are connected to the polarization-maintaining isolator (8). The polarization-maintaining isolator (8) is connected to the pigtail (6). One end of the pigtail (6) is installed at the fiber outlet on the side of the lower housing (5). The other end of the pigtail (6) is equipped with an FC / APC connector to output laser light.

2. The four-channel integrated narrow linewidth laser module according to claim 1, characterized in that: The aforementioned polarization-maintaining wavelength division multiplexers include polarization-maintaining wavelength division multiplexer I (7), polarization-maintaining wavelength division multiplexer II (14) and polarization-maintaining wavelength division multiplexer III (15). Interfaces one and two of the four-channel integrated laser (3) are connected to polarization-maintaining wavelength division multiplexer I (7). Interface three of the four-channel integrated laser (3) and polarization-maintaining wavelength division multiplexer I (7) are connected to polarization-maintaining wavelength division multiplexer II (14). Interface four of the four-channel integrated laser (3) and polarization-maintaining wavelength division multiplexer II (14) are connected to polarization-maintaining wavelength division multiplexer III (15). Polarization-maintaining wavelength division multiplexer III (15) is connected to polarization-maintaining isolator (8).

3. The four-channel integrated narrow linewidth laser module according to claim 1, characterized in that: The lower housing (5) is provided with a main heat dissipation platform (12) in the middle position. Four integrated lasers (3) are installed and fixed on the main heat dissipation platform (12). The gap between the four integrated lasers (3) and the main heat dissipation platform (12) is filled with thermal conductive material.

4. The four-channel integrated narrow linewidth laser module according to claim 1, characterized in that: The lower housing (5) is provided with a boss (17), and a number of auxiliary heat dissipation platforms (11) are provided around the lower housing (5). The circuit board (4) is installed and fixed on the boss (17). The position of the temperature control chip of the circuit board (4) corresponds to the position of the number of auxiliary heat dissipation platforms (11). The temperature control chip and the auxiliary heat dissipation platforms (11) are filled with thermal conductive material. The lower housing (5) also includes a boss (16) and a boss (18) provided on the lower housing (5). The boss (16) and the boss (18) are used to install the fiber optic disk (2).

5. The four-channel integrated narrow linewidth laser module according to claim 1, characterized in that: The upper shell (1) is provided with a square-shaped reinforcing rib (9) around its perimeter, and the square-shaped reinforcing rib (9) has a notch reserved to allow the optical fiber to pass through the fiber outlet; the upper shell (1) is also provided with a grid-shaped reinforcing rib (10) in the middle position.

6. The four-channel integrated narrow linewidth laser module according to claim 1, characterized in that: The polarization-maintaining isolator (8) and several polarization-maintaining wavelength division multiplexers are fixed between the fiber optic disk (2) and the vertical plate (13) with glue.

7. The four-channel integrated narrow linewidth laser module according to claim 1, characterized in that: The circuit board (4) includes a microcontroller and four LD constant current sources. The microcontroller is connected to 16 ADCs and 8 DACs respectively. The microcontroller is also connected to a connector via an RS485 chip. The connector is connected to a power module. The 16 ADCs are connected to 4 TIAs, four LD constant current sources, four integrated lasers (3) and an onboard NTC respectively. The four integrated lasers (3) are connected to the four TIAs. The 8 DACs are connected to the four LD constant current sources. The 8 DACs are connected to the four integrated lasers (3) via four temperature control circuits. The four LD constant current sources are connected to the four integrated lasers (3).

Images