A PPLN wavelength converter

Abstract

The application discloses a PPLN wavelength converter, which comprises a wavelength converter, a connecting optical fiber wire harness is connected to both ends of the wavelength converter, and a connecting socket is installed on one side of the wavelength converter; a shell is arranged on the wavelength converter, a shell cover is covered on the shell, a PPLN crystal assembly is installed in the shell, coupling optical fiber pieces are installed at both ends of the PPLN crystal assembly, a plurality of fixing devices are arranged at both ends of the PPLN crystal assembly, a sealing strip is arranged in the shell cover, clamping grooves are formed at both ends of the shell, and a plurality of connecting columns are arranged below the shell cover. The solid wall blocks are arranged on the inner walls of the shell, the PPLN crystal assembly is arranged between the solid wall blocks, the auxiliary shift gears on the two sides of the blocks are meshed with the built-in rack grooves, the auxiliary shift gears are shifted up and down, the auxiliary pressing pads press the side walls of the PPLN crystal assembly, and the stability of the PPLN crystal assembly is ensured. Compared with the traditional adhesive installation, the package is firm, and the package is more convenient to disassemble and take out.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, specifically a PPLN wavelength converter. Background Technology

[0002] PPLN refers to periodically polarized lithium niobate. Periodically polarized lithium niobate is a highly efficient wavelength-conversion nonlinear optical crystal with advantages such as high frequency conversion efficiency and no walk-off effect. Moreover, it is the only nonlinear optical crystal that can achieve arbitrary wavelength output within its transmission range through flexible periodic structure design, which can meet the diverse needs of modern optics for lasers.

[0003] Based on the nonlinear optical effects of materials, where the nonlinear polarization mechanism leads to the multiplication or combination of frequencies of the input optical signal, specific frequency conversion and wavelength tuning requirements can be achieved by precisely controlling the periodic polarization structure of the PPLN material, the parameters of the pump light, and the characteristics of the input optical signal.

[0004] However, the existing technology has the following shortcomings: Current wavelength converters generally use adhesive to fix the PPLN crystal component base. After use, the adhesive can ensure the firmness of the fixation with the long term of use, but because the adhesive is stuck to the bottom of the PPLN crystal component, it is difficult to remove it during subsequent disassembly. Summary of the Invention

[0005] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a PPLN wavelength converter. By using solid wall blocks set on both sides inside the housing in conjunction with displacement blocks to adjust up and down with the cooperation of auxiliary shift gears and rack grooves, the PPLM crystal component is locked between them and limited. At the same time, the auxiliary pressure pad presses down on the surface of the PPLM crystal component to achieve a fixing effect. Therefore, it is easier to disassemble and remove during maintenance compared to traditional fixing methods.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a PPLN wavelength converter, comprising a wavelength converter with connecting fiber optic bundles connected to both ends and a connection socket installed on one side of the wavelength converter; a housing is disposed within the wavelength converter, the housing is covered by a cover, a PPLN crystal assembly is installed inside the housing, coupling fiber optic components are installed at both ends of the PPLN crystal assembly, and several fixing devices are provided at both ends of the PPLN crystal assembly; a sealing strip is provided inside the cover, and a plurality of side sealing blocks are provided in front of the sealing strip; locking grooves are provided at both ends of the housing, and a plurality of connecting posts are provided below the cover. The sealing strip mainly improves the sealing performance when the cover is connected to the housing, thereby ensuring the sealing performance between the cover and the housing, and also works with the connecting posts to reinforce the connection, ensuring the firmness of the connection between the housing and the cover.

[0008] A further improvement to the present invention is that the fixing device includes a solid wall block, which has a movable cavity. Both sides of the movable cavity have rack grooves, and a displacement locking block is installed between the rack grooves. A fixing bolt is fixed to the bottom of the solid wall block. The solid wall block is fixed to the inner wall of the housing by bolts, and the movable cavity has rack grooves on both sides, allowing for displacement of the movable locking block through the rack grooves, providing adjustment for different heights.

[0009] A further improvement to the present invention is that a block is provided inside the displacement block, and auxiliary displacement gears are installed on both sides of the block. An inner locking hole is opened on the lower surface of the block, and an auxiliary pressure pad is provided below the inner locking hole. A plurality of connecting bolts are installed above the auxiliary pressure pad. The auxiliary pressure pad is driven by the connecting bolts and connected to the inner locking hole below the block. The auxiliary pressure pad presses against the surface of the PPLN crystal component to fix the PPLN crystal component and prevent displacement during use.

[0010] In a further improvement to the present invention, the connecting bolt is nested with the inner locking hole, the auxiliary pressure pad is connected to the inner locking hole via the connecting bolt, the block engages with the rack groove via the auxiliary shifting gears on both sides, the auxiliary pressure pad abuts against the surface of the PPLN crystal assembly, the solidifying blocks are disposed on both sides of the PPLN crystal assembly, the shell cover is connected to the housing via the connecting post, and the shell cover is closed to the housing via the sealing strip. The solidifying block device mainly serves to secure both sides of the PPLN crystal assembly, and at the same time, it provides a position for the connecting post connecting the shell cover and the housing after a certain interval, facilitating the control of the interval between the two.

[0011] A further improvement to the present invention is that a clamping sealing block is provided inside the connection socket, and a plurality of nested frames are provided in front of the clamping sealing block. A fixing rod is connected to the inner surface of each nested frame, and a pin connector is installed between the nested frames. A movable protective sleeve is nested around each pin connector. The pin connector is mainly used for connecting external modules, and also for data exchange processing, thereby ensuring real-time remote monitoring of the wavelength converter's operating status and internal component status.

[0012] A further improvement to the present invention is that a sleeve frame is provided inside the movable protective sleeve, an anti-detachment block is fixed on the top of the sleeve frame, compression spring rods are provided on both sides of the anti-detachment block, and limit grooves are provided on both sides of the sleeve frame. The compression spring rods are mainly used to adapt to the retraction and adjustment of the sleeve frame. When the sleeve frame is subjected to force, it can form a corresponding inward retraction, so that the inward retraction drives the sleeve frame to retract synchronously, ensuring that the sleeve frame does not affect the connection and use of the pin connector.

[0013] In a further improvement to the present invention, the sleeve frame is connected to the nested frame via the compression spring rod, the limiting groove cooperates with the fixing rod, the top of the pin connector is connected to the fixing rod, and the nested frame is fixed to the side wall of the housing via the clamping sealing block. The limiting groove is mainly designed to accommodate the fixing rod for top engagement and limiting, thereby controlling the retraction distance of the sleeve frame, and also allowing the packaging anti-detachment block to be precisely aligned and snapped into the nested frames.

[0014] A further improvement to the present invention is that a frame body is provided within the nested frame, and an inner groove is formed within the frame body. A top-closing post is installed at one end of the inner groove, and a spiral seat is installed at the other end of the inner groove. One end of the top-closing post is connected to the compression spring rod, and the spiral seat is connected to the other end of the compression spring rod. The top-closing post mainly adapts to the top of the compression spring rod to achieve top-closing, while the spiral seat is used to secure the compression spring rod, thereby ensuring that the compression spring rod can retract within the inner groove, facilitating the retraction and reset of the frame, and protecting the pin when the pin connector is not in use.

[0015] A further improvement to the present invention is that a sleeve is provided inside the connecting column, the top of the sleeve has a threaded inner groove, the surface of the sleeve has a heat-conducting through hole, the bottom of the sleeve is connected to a heat-dissipating connecting seat, the heat-dissipating connecting seat has a housing inside, the surface of the housing has a through groove, and an external threaded sleeve is provided on the top of the housing. The heat-conducting through hole is mainly used for heat conduction inside the housing, so that the heat is introduced through the through hole and then directly output with the through groove of the housing below, forming an external discharge and achieving a cooling effect.

[0016] In a further improvement to the present invention, the seat is nested within the bottom of the housing, the through groove mates with the heat-conducting through hole, the external threaded sleeve is threadedly connected to the bottom of the sleeve, and the sleeve is connected to the bottom of the cover via the internal threaded groove. The seat is primarily connected to the bottom of the sleeve via the external threaded sleeve penetrating the bottom of the housing, thus allowing the cover to carry the sealing strip and be firmly fixed to the housing, ensuring a tight seal. Beneficial effects

[0017] Compared with the prior art, the present invention has the following beneficial effects;

[0018] 1. This invention places solid wall blocks on both sides of the inner wall of the housing, and then places the PPLN crystal assembly between the solid wall blocks. With the cooperation of the built-in rack and pinion groove, the auxiliary shift gears on both sides of the block engage with it to move up and down, driving the auxiliary pressure pad to press down on the side wall of the PPLN crystal assembly, thereby ensuring the stability of the PPLN crystal assembly. Compared with traditional adhesive installation, the packaging is more secure and easier to disassemble and remove.

[0019] 2. This invention protects the pin connector from all sides when the sleeve is not in use. When the pin connector is used for connection, the inner fixing of the connector allows the compression spring rod to be compressed, which in turn causes the sleeve to retract inward in the inner groove in conjunction with the top closing post and the spiral seat. Finally, the whole thing retracts into the nested frame, without interfering with the normal use of the pin connector, and also protects the pins when it is not in use.

[0020] 3. This invention achieves interconnection through the guide tube through hole on the sleeve and the through groove on the base shell. After the top of the sleeve is connected, some of the heat generated by the PPLN crystal component sealing box inside the shell is collected on the surface of the sealing box. The generated heat enters through the heat conduction through hole and enters the through groove on the base shell, thereby dissipating the heat generated by the PPLN crystal component sealing box into the interior of the shell, forming an auxiliary discharge and achieving a cooling effect on the PPLN crystal component sealing box. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a PPLN wavelength converter according to the present invention;

[0022] Figure 2 This is a three-dimensional exploded view of the wavelength converter in a PPLN wavelength converter according to the present invention.

[0023] Figure 3 This is a three-dimensional structural diagram of a fixing device in a PPLN wavelength converter according to the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of a displacement card block in a PPLN wavelength converter according to the present invention;

[0025] Figure 5 This is a three-dimensional structural diagram of a connection socket in a PPLN wavelength converter according to the present invention;

[0026] Figure 6 This is a three-dimensional structural diagram of a movable protective sleeve in a PPLN wavelength converter according to the present invention;

[0027] Figure 7 This is a cross-sectional three-dimensional structural diagram of a nested frame in a PPLN wavelength converter according to the present invention.

[0028] Figure 8 This is a three-dimensional structural diagram of a connecting post in a PPLN wavelength converter according to the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the sleeve in a PPLN wavelength converter according to the present invention.

[0030] In the diagram: Wavelength converter-1, connecting fiber optic bundle-2, connecting socket-3, housing-11, housing cover-12, sealing strip-13, side sealing block-14, connecting post-15, locking groove-16, PPLN crystal assembly-17, coupling fiber component-18, fixing device-19, wall block-191, rack groove-192, displacement locking block-193, fixing bolt piece-194, movable cavity-195, block-1931, inner locking hole-1932, auxiliary shifting gear-1933, connecting bolt-1934 1935, Auxiliary pressure pad, Clamping sealing block, Nested frame, Pin connector, Movable protective sleeve, Fixing rod, Sleeve frame, Compression spring rod, Anti-detachment block, Limiting groove, Frame body, Inner groove, Top closing column, Spiral seat, Sleeve, Threaded inner groove, Heat conduction through hole, Heat dissipation connecting seat, Seat shell, Through groove, External thread sleeve, 1543. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies are not connected through a transitional structure, but rather formed as a whole through a connecting structure. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0036] As attached Figure 1 To be continued Figure 4 As shown: Figure 1 This is a schematic diagram of the structure of a PPLN wavelength converter according to the present invention; Figure 2 This is a three-dimensional exploded view of the wavelength converter in a PPLN wavelength converter according to the present invention. Figure 3 This is a three-dimensional structural diagram of a fixing device in a PPLN wavelength converter according to the present invention; Figure 4 This is a three-dimensional structural diagram of a displacement card block in a PPLN wavelength converter according to the present invention.

[0037] This embodiment provides a PPLN wavelength converter, including a wavelength converter 1. Both ends of the wavelength converter 1 are connected to connecting fiber optic bundles 2, and a connecting socket 3 is installed on one side of the wavelength converter 1. A housing 11 is disposed inside the wavelength converter 1, and a cover 12 covers the housing 11. A PPLN crystal assembly 17 is installed inside the housing 11. Coupler fiber components 18 are installed at both ends of the PPLN crystal assembly 17. Several fixing devices 19 are provided at both ends of the PPLN crystal assembly 17. A sealing strip 13 is provided inside the cover 12, and a plurality of side sealing blocks 14 are provided in front of the sealing strip 13. Locking grooves 16 are provided at both ends of the housing 11, and a plurality of connecting posts 15 are provided below the cover 12. A wall block 191 is provided inside the fixing device 19, and a movable cavity 195 is provided inside the wall block 191. Rack grooves 192 are provided on both sides of the movable cavity 195, and displacement blocks 193 are installed between the rack grooves 192. A fixing bolt 194 is fixed to the bottom of the wall block 191. The displacement block 193 contains a block 1931. Auxiliary shift gears 1933 are installed on both sides of the block 1931. An inner locking hole 1932 is opened on the lower surface of the block 1931. An auxiliary pressure pad 1935 is provided below the inner locking hole 1932. A plurality of connecting bolts 1934 are installed above the auxiliary pressure pad 1935.

[0038] Furthermore, the PPMgLN crystal chip is fabricated into a thin-film ridge waveguide structure within the PPLN crystal module, and is also housed in a separate sealed enclosure. This combines the advantages of a waveguide with low transmission loss and a periodically polarized crystal with a high nonlinear coefficient, focusing light into a smaller ventilation aperture, greatly increasing the light energy density, while not damaging the crystal's own lattice structure, thus solving the problem of low damage threshold in traditional waveguide structures.

[0039] Furthermore, the fixing device 19 is provided with at least 3 sets, two in each set, which are installed opposite to each other and distributed on the inner wall of the housing. It is used to limit and fix the placement of the PPLN crystal component on both sides, so as to ensure that the PPLN crystal component can be firmly fixed and prevent the PPLN crystal component from moving.

[0040] The specific working principle is as follows:

[0041] This invention unfolds the housing 11, then installs the fixing device 19 on the side wall of the housing 11, installs the wall fixing block 191 on the inner wall of the housing 11, and then places the PPLN crystal assembly 17 between the wall fixing blocks 191. The two ends are engaged with the external connecting fiber optic bundle 2 and the locking groove 16 through the coupling fiber component 19. At the same time, the block 1931 on the movable cavity 195, together with the auxiliary moving gear 1933, drives the rack groove 192 to move downward, so that the auxiliary pressure pad 1935 connected to the inner locking hole 1932 and the connecting bolt 1934 is pressed down and engaged on both sides of the PPLN crystal assembly 17, thus completing its positioning. Then, the housing cover 12, together with the sealing strip 13, closes the housing 11 with the cooperation of the connecting post 15. At the same time, the side sealing block 14 engages with the locking groove 16 to cover it, finally forming the wavelength converter 1. Example 2

[0042] As attached Figure 5 To be continued Figure 7 As shown: Figure 5 This is a three-dimensional structural diagram of a connection socket in a PPLN wavelength converter according to the present invention; Figure 6 This is a three-dimensional structural diagram of a movable protective sleeve in a PPLN wavelength converter according to the present invention; Figure 7 This is a cross-sectional three-dimensional structural diagram of the nested frame in a PPLN wavelength converter according to the present invention.

[0043] The connector 3 includes a clamping sealing block 31, with a plurality of nested frames 32 in front of the clamping sealing block 31. A fixing rod 35 is connected to the inner surface of each nested frame 32. A pin connector 33 is installed between the nested frames 32, and a movable protective sleeve 34 is nested around the pin connector 33. A sleeve frame 341 is installed inside the movable protective sleeve 34. An anti-detachment block 343 is fixed above the sleeve frame 341. Compression spring rods 342 are provided on both sides of the anti-detachment block 343. Limit grooves 344 are provided on both sides of the sleeve frame 341. A frame body 321 is installed inside the nested frame 322. An inner groove 322 is provided inside the frame body 321. A top-closing post 323 is installed at one end of the inner groove 322, and a screw seat 324 is installed at the other end of the inner groove 322.

[0044] Furthermore, at least two nested frames 32 are provided, both fixed to the surface of the clamping sealing block 31, so as to fix and cover the pin connector 33. At the same time, at least two inner grooves 322 formed on the inner wall of the nested frame are used for the cooperation of the movable protective sleeve 34.

[0045] Furthermore, the protective sleeve 34 is made of plastic so that it can retract into the nesting frame 32 with the cooperation of the compression spring rods 342 on both sides. When the pin connector 33 is not in use, the sleeve 341 is nested outside the pin connector 33 to protect it.

[0046] The specific working principle is as follows:

[0047] This invention forms a seal by fixing the clamping sealing block 31 to the slot on the housing 11, and then fixing it with the nested frame 32 on the surface of the clamping sealing block 31. The pin connector 33 is then installed inside the nested frame 32 and fixed with the fixing rod 35 while maintaining a gap for the installation of the movable protective sleeve 34. The sleeve 341 is fixed to the inner groove 322 of the inner wall of the frame 321 by compression spring rods 342 on both sides. One end is connected to the top closing column 323 and the other end is connected to the screw seat 324 so that when the sleeve 341 is under force, the compression spring rod 342 drives it to retract, thereby protecting the pin connector in advance when the sleeve 341 is not in use. Example 3

[0048] As attached Figure 8 To be continued Figure 9 As shown: Figure 8 This is a three-dimensional structural diagram of a connecting post in a PPLN wavelength converter according to the present invention; Figure 9 This is a three-dimensional structural diagram of the sleeve in a PPLN wavelength converter according to the present invention.

[0049] The connecting column 15 is provided with a sleeve 151. The top of the sleeve 151 is provided with a threaded inner groove 152. The surface of the sleeve 151 is provided with a heat-conducting through hole 153. The bottom of the sleeve 151 is connected to a heat dissipation connecting seat 154. The heat dissipation connecting seat 154 is provided with a seat shell 1541. The surface of the seat shell 1541 is provided with a through groove 1542. The top of the seat shell 1541 is provided with an external threaded sleeve 1543.

[0050] Furthermore, the sleeve 151 is made of stainless steel and has multiple heat-conducting through holes 153 on its surface, which are through the surface of the sleeve 151 and form a through groove 1542 on the adapter housing 1541 to allow air to flow.

[0051] The specific working principle is as follows:

[0052] The present invention consists of two parts: the top of the sleeve 151 and the inner thread groove 152 are made to the bottom of the shell cover. Then, a heat conduction hole 153 is opened on the surface of the sleeve 151. Finally, the heat dissipation connecting seat 154 passes through the bottom of the shell and is connected to the bottom of the sleeve 151 through the seat shell 1541 and the outer threaded sleeve 1543. During use, some of the heat inside the shell is discharged from the shell 11 through the heat conduction hole 153 to the through groove 1542 inside the seat shell 1541.

[0053] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0054] The term "embodiment" in this specification means that a specific feature or characteristic described in connection with an embodiment is included in at least one embodiment of the invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0055] Furthermore, the described features or characteristics can be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented without the aforementioned specific details or may be implemented using other methods, components, materials, etc.

Claims

1. A PPLN wavelength converter, characterized in that, Includes a wavelength converter (1), both ends of which are connected to a fiber optic cable bundle (2), and a connection socket (3) is installed on one side of the wavelength converter (1). The wavelength converter (1) is provided with a housing (11), and the housing (11) is covered with a cover (12). A PPLN crystal assembly (17) is installed inside the housing (11). Coupled fiber components (18) are installed at both ends of the PPLN crystal assembly (17). Several fixing devices (19) are provided at both ends of the PPLN crystal assembly (17). A sealing strip (13) is provided inside the cover (12). A plurality of side sealing blocks (14) are provided in front of the sealing strip (13). A locking groove (16) is provided at both ends of the housing (11). A plurality of connecting posts (15) are provided below the cover (12). The fixing device (19) is provided with a solid wall block (191), and a movable cavity (195) is opened in the solid wall block (191). A rack groove (192) is provided on both sides of the movable cavity (195). A displacement block (193) is installed between the rack grooves (192). A fixing bolt piece (194) is fixed at the bottom of the solid wall block (191). The displacement block (193) contains a block (1931), and auxiliary displacement gears (1933) are installed on both sides of the block (1931). An inner locking hole (1932) is opened on the lower surface of the block (1931), and an auxiliary pressure pad (1935) is provided below the inner locking hole (1932). A plurality of connecting bolts (1934) are installed above the auxiliary pressure pad (1935). The connecting bolt (1934) is nested with the inner locking hole (1932). The auxiliary pressure pad (1935) is connected to the inner locking hole (1932) through the connecting bolt (1934). The block (1931) meshes with the rack groove (192) through the auxiliary shift gears (1933) on both sides. The auxiliary pressure pad (1935) abuts against the surface of the PPLN crystal assembly (17). The solid wall block (191) is disposed on both sides of the PPLN crystal assembly (17). The shell cover (12) is connected to the shell (11) through the connecting post (15). The shell cover (12) is closed to the shell (11) through the sealing strip (13).

2. A PPLN wavelength converter according to claim 1, characterized in that: The connection socket (3) is provided with a clamping sealing block (31), and a plurality of nested frames (32) are provided in front of the clamping sealing block (31). A fixing rod (35) is connected to the inner surface of the nested frame (32). A pin connector (33) is installed between the nested frames (32), and a movable protective sleeve (34) is nested outside the pin connector (33).

3. A PPLN wavelength converter according to claim 2, characterized in that: The movable protective sleeve (34) is provided with a sleeve frame (341), and an anti-detachment block (343) is fixed on the upper part of the sleeve frame (341). Compression spring rods (342) are provided on both sides of the anti-detachment block (343), and limit grooves (344) are provided on both sides of the sleeve frame (341).

4. A PPLN wavelength converter according to claim 3, characterized in that: The sleeve frame (341) is connected to the nested frame (32) through the compression spring rod (342), the limiting groove (344) cooperates with the fixing rod (35), the top of the pin connector (33) is connected to the fixing rod (35), and the nested frame (32) is fixed to the side wall of the housing (11) through the clamping sealing block (31).

5. A PPLN wavelength converter according to claim 4, characterized in that: The nested frame (32) is provided with a frame body (321), and an inner groove (322) is provided in the frame body (321). A top fitting post (323) is installed at one end of the inner groove (322), and a spiral seat (324) is installed at the other end of the inner groove (322). The top of the top fitting post (323) is connected to one end of the compression spring rod (342), and the top of the spiral seat (324) is connected to the other end of the compression spring rod (342).

6. A PPLN wavelength converter according to claim 1, characterized in that: A sleeve (151) is provided inside the connecting column (15). A threaded inner groove (152) is provided on the top of the sleeve (151). A heat-conducting through hole (153) is provided on the surface of the sleeve (151). A heat dissipation connecting seat (154) is connected to the bottom of the sleeve (151). A seat shell (1541) is provided inside the heat dissipation connecting seat (154). A through groove (1542) is provided on the surface of the seat shell (1541). An external threaded sleeve (1543) is provided above the seat shell (1541).

7. A PPLN wavelength converter according to claim 6, characterized in that: The base (1541) is nested at the bottom of the housing (11), the through groove (1542) cooperates with the heat-conducting through hole (153), the external threaded sleeve (1543) is threaded to the bottom of the sleeve (151), and the sleeve (151) is connected to the bottom of the cover (12) through the threaded inner groove (152).

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