CN222127232U

CN222127232U - Radiation-resistant optical fiber amplifier

Info

Publication number: CN222127232U
Application number: CN202323472545.6U
Authority: CN
Inventors: 顾燚; 张翔; 张皓星
Original assignee: Huanxin Yilian Shanghai Technology Co ltd
Current assignee: Huanxin Yilian Shanghai Technology Co ltd
Priority date: 2023-12-20
Filing date: 2023-12-20
Publication date: 2024-12-06
Anticipated expiration: 2033-12-20

Abstract

The utility model belongs to the technical field of optical fiber amplifiers, and particularly relates to an irradiation-resistant optical fiber amplifier which comprises an outer shell, wherein an irradiation shielding area for installing an irradiation sensitive device, two active optical fiber heat dissipation shielding areas for shielding irradiation and heat dissipation of an optical fiber and two passive device areas are arranged in the outer shell, the two active optical fiber heat dissipation shielding areas are respectively positioned at two sides of the irradiation shielding area, the passive device areas are positioned between the active optical fiber heat dissipation shielding areas and the irradiation shielding areas, an optical path component is arranged in the outer shell and used for enabling an optical signal to pass through the irradiation shielding areas, the two active optical fiber heat dissipation shielding areas and the two passive device areas, the optical path component is connected with an armored optical cable component through signals, and the armored optical cable component is positioned at the outer side of the outer shell. The device realizes radiation shielding and heat dissipation of the optical fiber through the radiation shielding area and the two active optical fiber heat dissipation shielding areas, ensures the tolerance capability of the optical fiber amplifier in a space radiation environment, and maintains the stability of key indexes such as gain capability, noise coefficient and the like.

Description

Radiation-resistant optical fiber amplifier

Technical Field

The utility model belongs to the technical field of optical fiber amplifiers, and particularly relates to an irradiation-resistant optical fiber amplifier.

Background

With the development of space laser technology, especially the advantages of laser communication in terms of system capacity, interference resistance, confidentiality and the like, in the satellite communication field, the laser communication gradually replaces the conventional radio frequency communication.

Meanwhile, since the space laser communication link is far away, a sufficient signal transmission power is required at the transmitting end to obtain a sufficient link margin. As a core device of a long-span communication system, an optical fiber amplifier has been widely used in the field of space laser communication.

The core of the optical fiber amplifier is an active optoelectronic device such as an erbium-doped optical fiber (Er fiber), an erbium-doped ytterbium-doped optical fiber (ErY fiber), a single-mode pump laser, a multimode pump laser, a photoelectric detector and the like. In the spatial application environment, optoelectronic devices are susceptible to gamma rays, which are based on damage caused by the effect of the total dose of radiation. The total dose effect refers to the total absorbed energy level that the device can withstand before significant changes in the characteristics of the optoelectronic device occur, beyond which the device cannot function properly, leading to permanent failure. Which in turn affects the amplification capability and noise level of the fiber amplifier, resulting in abnormal communication of the link.

The existing common space radiation-proof treatment method is to select radiation-proof photoelectronic devices, the devices are designed from a wafer level by taking radiation resistance as a target, and then the photoelectronic devices with radiation-proof indexes are formed through the procedures of coupling, packaging and the like.

Disclosure of utility model

It is an object of the present utility model to provide a radiation-resistant optical fiber amplifier to solve the above-mentioned problems.

In order to achieve the above object, the present utility model provides the following solutions:

The radiation-resistant optical fiber amplifier comprises an outer shell, wherein an irradiation shielding area for installing an irradiation sensitive device, two active optical fiber heat dissipation shielding areas for shielding irradiation and heat dissipation of the optical fiber and two passive device areas are arranged in the outer shell;

The two active optical fiber heat dissipation shielding areas are respectively positioned at two sides of the irradiation shielding area, and the passive device area is positioned between the active optical fiber heat dissipation shielding area and the irradiation shielding area;

The light path component is arranged in the outer shell and enables light signals to pass through the irradiation shielding area, the two active optical fiber heat dissipation shielding areas and the two passive device areas;

The optical path component is in signal connection with an armored optical cable component, and the armored optical cable component is positioned outside the shell.

Preferably, the outer shell comprises an aluminum alloy outer shell bottom shell, an aluminum alloy outer shell cover plate is fixedly connected to the aluminum alloy outer shell bottom shell through a plurality of fixing screws, and the radiation shielding area, the two active optical fiber radiating shielding areas and the two passive device areas are arranged in the aluminum alloy outer shell bottom shell;

the armored optical cable assembly is positioned at the outer side of the aluminum alloy outer shell bottom shell;

the light path component is positioned in the aluminum alloy outer shell bottom shell;

The armored optical cable assembly comprises an input armored optical cable and an output armored optical cable, wherein the output end of the input armored optical cable is in signal connection with the input end of the optical path assembly, and the output end of the optical path assembly is in signal connection with the input end of the output armored optical cable.

Preferably, the radiation shielding area comprises a lead inner shell bottom shell, the lead inner shell bottom shell is fixedly connected in the aluminum alloy outer shell bottom shell, an optoelectronic device plate is fixedly connected in the lead inner shell bottom shell, the optoelectronic device plate is used for mounting an electronic device, and a lead inner shell cover plate is fixedly connected at the top of the lead inner shell bottom shell.

Preferably, the two active optical fiber heat dissipation shielding areas are ErY fiber heat dissipation shielding areas and Er fiber heat dissipation shielding areas respectively, the ErY fiber heat dissipation shielding areas and the Er fiber heat dissipation shielding areas are located between the aluminum alloy outer shell bottom shell and the lead inner shell bottom shell, the ErY fiber heat dissipation shielding areas and the Er fiber heat dissipation shielding areas are located at two opposite sides of the lead inner shell bottom shell respectively, and the two passive device areas are located between the ErY fiber heat dissipation shielding areas and the lead inner shell bottom shell and between the Er fiber heat dissipation shielding areas and the lead inner shell bottom shell respectively.

Preferably, the optical path component comprises a front-stage optical amplifying module and a rear-stage optical amplifying module;

The front-stage optical amplification module comprises a first low-power input detection device, a wavelength division multiplexer, an Er fiber and a first low-power output detection device which are sequentially connected in a signal mode, wherein the wavelength division multiplexer is connected with a single-mode pump laser in a signal mode;

The single-mode pump laser, the first low-power input detection device and the first low-power output detection device are fixedly connected to the photoelectronic device board, the wavelength division multiplexer is positioned in the corresponding passive device area, and the Er fiber is arranged in the Er fiber heat dissipation shielding area;

The output end of the first low-power output detection device is in signal connection with the rear-stage optical amplification module, and the output end of the input armored optical cable is in signal connection with the input end of the first low-power input detection device.

Preferably, the rear-stage optical amplification module comprises ErY fibers, a high-power beam combiner and a second high-power output detection device which are sequentially connected in a signal mode, wherein the high-power beam combiner is connected with a multimode pump laser component in a signal mode, the input end of the ErY fibers is connected with the output end of the first low-power output detection device in a signal mode, and the output end of the second high-power output detection device is connected with the input end of the output armored optical cable in a signal mode;

The second high-power output detection device and the multimode pump laser assembly are arranged on the photoelectronic device board, erY fibers are arranged in the ErY fiber heat dissipation shielding area, and the high-power beam combiner is positioned in the corresponding passive device area.

Preferably, the multimode pump laser assembly comprises a first multimode pump laser and a second multimode pump laser, and the first multimode pump laser and the second multimode pump laser are respectively connected with the high-power beam combiner through signals;

The first multimode pump laser and the second multimode pump laser are mounted on the optoelectronic device board.

Preferably, the ErY fiber heat dissipation shielding area or the Er fiber heat dissipation shielding area wraps the corresponding ErY fiber or Er fiber through heat conduction silicone rubber, and a layer of lead light net wraps the outer side of the heat conduction silicone rubber.

Preferably, the wavelength division multiplexer and the high-power beam combiner are fixedly connected in the corresponding passive device region through heat-conducting silicone rubber respectively.

Preferably, the thickness of the aluminum alloy outer shell bottom shell and the aluminum alloy outer shell cover plate is 1.5mm;

The thickness of the lead inner shell bottom shell and the lead inner shell cover plate is 0.5mm.

Compared with the prior art, the utility model has the following advantages and technical effects:

When the radiation shielding device is used, radiation sensitive devices which are easily affected by radiation of the light path component are arranged in the radiation shielding area, the radiation shielding area is utilized for carrying out radiation shielding on the radiation sensitive devices, so that the radiation sensitive devices are prevented from being affected by radiation, and meanwhile, radiation shielding and radiation of the optical fibers are realized through the two active optical fiber radiation shielding areas, so that the tolerance capability of the optical fiber amplifier in a space radiation environment is ensured, and the stability of key indexes such as gain capability, noise coefficient and the like is maintained.

Drawings

For a clearer description of an embodiment of the utility model or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a top view of the inner structure of the bottom shell of the aluminum alloy outer shell of the utility model;

FIG. 3 is a schematic view of the optical path assembly connection of the present utility model;

FIG. 4 is a diagram of a control test method of the present utility model;

FIG. 5 is a graph showing the contrast of the irradiation effect of the present utility model;

The device comprises a fixing screw, an aluminum alloy outer shell cover plate, a lead inner shell cover plate, an optoelectronic device plate, a lead inner shell bottom shell, a 6-ErY-fiber heat dissipation shielding area, a 7-Er-fiber heat dissipation shielding area, an 8-aluminum alloy outer shell bottom shell, a 9-input armored optical cable, a 10-passive device area, an 11-first low-power input detection device, a 12-wavelength division multiplexer, a 13-single-mode pump laser, a 14-Er-fiber, a 15-first low-power output detection device, a 16-ErY-fiber, a 17-high-power beam combiner, a 18-first multi-mode pump laser, a 19-second multi-mode pump laser, a 20-second high-power output detection device and a 21-output armored optical cable.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1 to 5, the utility model discloses an irradiation-resistant optical fiber amplifier, which comprises an outer shell, wherein an irradiation shielding area for installing an irradiation sensitive device, two active optical fiber heat dissipation shielding areas for shielding irradiation and heat dissipation of the optical fiber and two passive device areas 10 are arranged in the outer shell;

The two active optical fiber heat dissipation shielding areas are respectively positioned at two sides of the irradiation shielding area, and the passive device area 10 is positioned between the active optical fiber heat dissipation shielding area and the irradiation shielding area;

An optical path component is arranged in the outer shell, and the optical path component enables an optical signal to pass through the irradiation shielding region, the two active optical fiber heat dissipation shielding regions and the two passive device regions 10;

The optical path component signal is connected with an armored optical cable component, and the armored optical cable component is positioned outside the outer shell.

According to a further optimization scheme, the outer shell comprises an aluminum alloy outer shell bottom shell 8, the aluminum alloy outer shell bottom shell 8 is fixedly connected with an aluminum alloy outer shell cover plate 2 through a plurality of fixing screws 1, and an irradiation shielding area, two active optical fiber heat dissipation shielding areas and two passive device areas 10 are arranged in the aluminum alloy outer shell bottom shell 8;

the armored optical cable assembly is positioned at the outer side of the aluminum alloy outer shell bottom shell 8;

The light path component is positioned in the aluminum alloy outer shell bottom shell 8;

The armored optical cable assembly comprises an input armored optical cable 9 and an output armored optical cable 21, wherein the output end of the input armored optical cable 9 is in signal connection with the input end of the optical path assembly, and the output end of the optical path assembly is in signal connection with the input end of the output armored optical cable 21.

Further optimizing scheme, the irradiation shielding area includes plumbous inner housing drain pan 5, and plumbous inner housing drain pan 5 rigid coupling is in aluminum alloy shell drain pan 8, and the rigid coupling has photoelectron device board 4 in the plumbous inner housing drain pan 5, and photoelectron device board 4 is used for the installation of electron device, and plumbous inner housing drain pan 5 top rigid coupling has plumbous inner housing apron 3.

According to a further optimization scheme, two active optical fiber radiating and shielding areas are ErY-fiber radiating and shielding area 6 and Er-fiber radiating and shielding area 7 respectively, erY-fiber radiating and shielding area 6 and Er-fiber radiating and shielding area 7 are located between an aluminum alloy outer shell bottom shell 8 and a lead inner shell bottom shell 5, erY-fiber radiating and shielding area 6 and Er-fiber radiating and shielding area 7 are located at two opposite sides of the lead inner shell bottom shell 5 respectively, and two passive device areas 10 are located between ErY-fiber radiating and shielding area 6 and the lead inner shell bottom shell 5 respectively and between Er-fiber radiating and shielding area 7 and the lead inner shell bottom shell 5 respectively.

Further optimizing scheme, the light path component comprises a front-stage light amplifying module and a rear-stage light amplifying module;

the front-stage optical amplification module comprises a first low-power input detection device 11, a wavelength division multiplexer 12, an Er fiber 14 and a first low-power output detection device 15 which are sequentially connected in a signal mode, wherein the wavelength division multiplexer 12 is connected with a single-mode pump laser 13 in a signal mode;

The single-mode pump laser 13, the first low-power input detection device 11 and the first low-power output detection device 15 are fixedly connected to the optoelectronic device board 4, the wavelength division multiplexer 12 is positioned in the corresponding passive device region 10, and the Er fiber 14 is arranged in the Er fiber heat dissipation shielding region 7;

The output end of the first low-power output detection device 15 is in signal connection with the rear-stage optical amplification module, and the output end of the input armored optical cable 9 is in signal connection with the input end of the first low-power input detection device 11.

The further optimizing scheme is that the rear-stage optical amplifying module comprises ErY optical fibers 16, a high-power beam combiner 17 and a second high-power output detecting device 20 which are sequentially connected in a signal mode, wherein the high-power beam combiner 17 is connected with a multimode pump laser component in a signal mode, the input end of the ErY optical fibers 16 is connected with the output end of the first low-power output detecting device 15 in a signal mode, and the output end of the second high-power output detecting device 20 is connected with the input end of the output armored optical cable 21 in a signal mode;

The second high power output detection device 20 and multimode pump laser assembly are mounted on the optoelectronic device board 4, erY fibers 16 are disposed within ErY fiber heat sink shield area 6, and high power combiner 17 is located within the corresponding passive device area 10.

In a further optimized scheme, the multimode pump laser assembly comprises a first multimode pump laser 18 and a second multimode pump laser 19, and the first multimode pump laser 18 and the second multimode pump laser 19 are respectively connected with the high-power beam combiner 17 in a signal manner;

the first 18 and second 19 multimode pump lasers are mounted on the optoelectronic device plate 4.

According to a further optimization scheme, the ErY fiber heat dissipation shielding region 6 or the Er fiber heat dissipation shielding region 7 wraps corresponding ErY fiber 16 or Er fiber 14 through heat-conducting silicone rubber, and a layer of lead light net wraps the outer side of the heat-conducting silicone rubber.

In a further optimized scheme, the wavelength division multiplexer 12 and the high-power beam combiner 17 are fixedly connected in the corresponding passive device region 10 through heat-conducting silicone rubber respectively.

Further optimizing scheme, the thickness of the aluminum alloy shell bottom shell 8 and the aluminum alloy shell cover plate 2 is 1.5mm;

The thickness of the lead inner housing bottom shell 5 and the lead inner housing cover plate 3 is 0.5mm.

The device consists of a fixing screw 1, an aluminum alloy outer shell cover plate 2, a lead inner shell cover plate 3, an optoelectronic device plate 4, a lead inner shell bottom shell 5, erY fiber heat dissipation shielding area 6, an Er fiber heat dissipation shielding area 7, an aluminum alloy outer shell bottom shell 8, an input armored optical cable 9, a passive device area 10, a first low-power input detection device 11, a wavelength division multiplexer 12, a single-mode pump laser 13, an Er fiber 14, a first low-power output detection device 15, a ErY fiber 16, a high-power beam combiner 17, a first multimode pump laser 18, a second multimode pump laser 19, a second high-power output detection device 20 and an output armored optical cable 21.

The thickness of the aluminum alloy outer shell cover plate 2 and the aluminum alloy outer shell bottom shell 8 is 1.5mm, and the thickness of the lead inner shell cover plate 3 and the lead inner shell bottom shell 5 is 0.5mm.

The analysis of the equivalent aluminum thickness according to the irradiation shielding can be calculated by the following formula.

ρ=M/S (1)

H=ρ/0.27 (2)

Wherein ρ is the mass areal density of the material, M is the mass of the material, S is the actual area of the material, and H is the equivalent aluminum thickness of the material.

According to the calculation of (1) and (2), the lead box with the thickness of 0.5mm is equivalent to the aluminum box with the thickness of 2mm, so that the volume can be obviously reduced under the same irradiation resistance.

Referring to fig. 3, the optical path component of the device includes a front-stage optical amplifying module and a rear-stage optical amplifying module, the front-stage optical amplifying module is sequentially connected with a first low-power input detection device 11, a wavelength division multiplexer 12, an Er fiber 14 and a first low-power output detection device 15, and the wavelength division multiplexer 12 is connected with a single-mode pump laser 13.

The first low-power input detection device 11 plays roles of signal light branching, unidirectional transmission reverse isolation and photoelectric detection, the wavelength division multiplexer 12 is further connected with the single-mode pump laser 13, and the first low-power output detection device 15 plays roles of signal light branching, unidirectional transmission reverse isolation and photoelectric detection.

The single-mode pump laser 13, the first low-power input detection device 11 and the first low-power output detection device 15 are positioned on the optoelectronic device board 4 in the lead inner shell bottom shell 5, the Er fiber 14 is positioned in the Er fiber heat dissipation shielding region 7, and all other passive devices (including the wavelength division multiplexer 12) are positioned in the passive device region 10.

The rear-stage optical amplification module comprises ErY optical fibers 16, a high-power beam combiner 17 and a second high-power output detection device 20 which are sequentially connected in sequence and are in signal connection, the second high-power output detection device 20 plays roles of signal optical branching, unidirectional transmission reverse isolation and photoelectric detection, and the high-power beam combiner 17 is also connected with a first multimode pump laser 18 and a second multimode pump laser 19.

The first multimode pump laser 18, the second multimode pump laser 19 and the second high-power output detection device 20 are located on the optoelectronic device board 4 in the lead inner housing bottom shell 5, the ErY fiber 16 is located in the ErY fiber heat-dissipating shielding region 6, and the high-power combiner 17 is located in the passive device region.

The shielding area of the optoelectronic device takes lead as a raw material, a layer of light inner shell is manufactured, and the optoelectronic device sensitive to irradiation is packaged in the light inner shell through the stud of the outer aluminum alloy shell, penetrating, locking and fixing.

And the ErY fiber heat dissipation shielding region 6 or the Er fiber heat dissipation shielding region 7 is made of lead as a raw material, a layer of light net is manufactured, heat conduction silicon rubber is used as a heat conduction material, and the Er fiber 14 or the ErY fiber 16 is packaged in the heat conduction silicon rubber.

The passive device region 10 is formed by milling a track with an aluminum alloy material, placing all passive devices therein, and fixing the passive devices by taking heat-conducting silicon rubber as a heat-conducting fixing material.

The input armored optical cable 9 and the output armored optical cable 21 are arranged outside the aluminum alloy outer shell bottom shell 8, the aluminum alloy outer shell is not protected, and the 3mm armored sheath manufactured by the special single-buckle pipe is used for carrying out irradiation protection on the optical cable.

The input light sequentially passes through the first low-power input detection device 11, the wavelength division multiplexer 12, the single-mode pump laser 13, the Er fiber 14, the first low-power output detection devices 15, erY fiber 16, the high-power beam combiner 17, the first multimode pump laser 18, the second multimode pump laser 19 and the second high-power output detection device 20 through the input armored optical cable 9, and is output through the output armored optical cable 21, and the whole transmission process is shielded and protected by the lead inner shell cover plate 3, the lead inner shell bottom shell 5, the ErY fiber heat dissipation shielding region 6 and the Er fiber heat dissipation shielding region 7.

Referring to fig. 4, in comparison with the conventional non-radiation-resistant optical fiber amplifier, radiation verification was performed according to the method shown in fig. 4, and the radiation source was irradiated with Co-60 irradiation source at a total dose of 30 rad (Si) and a dose rate of 0.01Gy (Si)/s. And recording power by the power meter C and the power meter D after metering.

Referring to fig. 5, after the irradiation total dose 30krad (Si) test is performed, by comparing the output power of the device with the output power of the conventional non-irradiation-resistant optical fiber amplifier, the irradiation-resistant performance of the device is obviously superior to that of the conventional non-irradiation-resistant optical fiber amplifier, the output power is only deteriorated by 1.5dB, and the service requirement at the end of service life is met.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

The foregoing embodiments are merely illustrative of the preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present utility model pertains are made without departing from the spirit of the present utility model, and all changes and modifications and improvements fall within the scope of the present utility model as defined in the appended claims.

Claims

1. The radiation-resistant optical fiber amplifier is characterized by comprising an outer shell, wherein an irradiation shielding area for installing an irradiation sensitive device, two active optical fiber heat dissipation shielding areas for shielding irradiation and heat dissipation of the optical fiber and two passive device areas (10) are arranged in the outer shell;

the two active optical fiber heat dissipation shielding areas are respectively positioned at two sides of the irradiation shielding area, and the passive device area (10) is positioned between the active optical fiber heat dissipation shielding area and the irradiation shielding area;

An optical path component is arranged in the outer shell, and enables an optical signal to pass through the irradiation shielding region, the two active optical fiber heat dissipation shielding regions and the two passive device regions (10);

2. The radiation-resistant optical fiber amplifier according to claim 1, wherein the outer shell comprises an aluminum alloy outer shell bottom shell (8), the aluminum alloy outer shell bottom shell (8) is fixedly connected with an aluminum alloy outer shell cover plate (2) through a plurality of fixing screws (1), and the radiation shielding area, the two active optical fiber radiating shielding areas and the two passive device areas (10) are arranged in the aluminum alloy outer shell bottom shell (8);

the armored optical cable assembly is positioned outside the aluminum alloy outer shell bottom shell (8);

the light path component is positioned in the aluminum alloy outer shell bottom shell (8);

The armored optical cable assembly comprises an input armored optical cable (9) and an output armored optical cable (21), wherein the output end of the input armored optical cable (9) is in signal connection with the input end of the optical path assembly, and the output end of the optical path assembly is in signal connection with the input end of the output armored optical cable (21).

3. The radiation-resistant optical fiber amplifier according to claim 2, wherein the radiation shielding area comprises a lead inner shell bottom shell (5), the lead inner shell bottom shell (5) is fixedly connected in the aluminum alloy outer shell bottom shell (8), an optoelectronic device plate (4) is fixedly connected in the lead inner shell bottom shell (5), the optoelectronic device plate (4) is used for mounting an electronic device, and a lead inner shell cover plate (3) is fixedly connected at the top of the lead inner shell bottom shell (5).

4. A radiation-resistant optical fiber amplifier according to claim 3, wherein the two active optical fiber radiating and shielding areas are ErY-fiber radiating and shielding areas (6) and 7-fiber Er radiating and shielding areas, erY-fiber radiating and shielding areas (6) and 7-fiber Er radiating and shielding areas are located between the aluminum alloy outer shell bottom shell (8) and the lead inner shell bottom shell (5), erY-fiber radiating and shielding areas (6) and 7-fiber Er radiating and shielding areas are located on two opposite sides of the lead inner shell bottom shell (5), and two passive device areas (10) are located between ErY-fiber radiating and shielding areas (6) and the lead inner shell bottom shell (5) and between Er-fiber radiating and shielding areas (7) and the lead inner shell bottom shell (5).

5. The irradiation resistant optical fiber amplifier as in claim 4, wherein the optical path component comprises a front stage optical amplification module and a rear stage optical amplification module;

The front-stage optical amplification module comprises a first low-power input detection device (11), a wavelength division multiplexer (12), an Er fiber (14) and a first low-power output detection device (15) which are sequentially connected in a signal mode, wherein the wavelength division multiplexer (12) is connected with a single-mode pump laser (13) in a signal mode;

The single-mode pump laser (13), the first low-power input detection device (11) and the first low-power output detection device (15) are fixedly connected to the optoelectronic device board (4), the wavelength division multiplexer (12) is located in the corresponding passive device region (10), and the Er fiber (14) is arranged in the Er fiber heat dissipation shielding region (7);

The output end of the first low-power output detection device (15) is in signal connection with the rear-stage optical amplification module, and the output end of the input armored optical cable (9) is in signal connection with the input end of the first low-power input detection device (11).

6. The irradiation-resistant optical fiber amplifier according to claim 5, wherein the rear-stage optical amplification module comprises ErY fibers (16), a high-power beam combiner (17) and a second high-power output detection device (20) which are sequentially connected in signal, wherein the high-power beam combiner (17) is connected with a multimode pump laser component in signal mode, the input end of the ErY fibers (16) is connected with the output end of the first low-power output detection device (15) in signal mode, and the output end of the second high-power output detection device (20) is connected with the input end of the output armored optical cable (21) in signal mode;

The second high-power output detection device (20) and the multimode pump laser assembly are mounted on the optoelectronic device board (4), the ErY fiber (16) is arranged in the ErY fiber heat dissipation shielding region (6), and the high-power beam combiner (17) is positioned in the corresponding passive device region (10).

7. An irradiation-tolerant optical fiber amplifier according to claim 6, characterized in that the multimode pump laser assembly comprises a first multimode pump laser (18) and a second multimode pump laser (19), the first multimode pump laser (18) and the second multimode pump laser (19) being respectively in signal connection with the high power combiner (17);

The first multimode pump laser (18) and the second multimode pump laser (19) are mounted on the optoelectronic device board (4).

8. The radiation-resistant optical fiber amplifier according to claim 6, wherein the ErY-fiber heat-dissipation shielding region (6) or the Er-fiber heat-dissipation shielding region (7) wraps the ErY-fiber (16) or the Er-fiber (14) corresponding to each other through heat-conducting silicone rubber, and a layer of lead light-weight net wraps the heat-conducting silicone rubber.

9. A radiation-resistant optical fiber amplifier according to claim 6, wherein said wavelength division multiplexer (12) and said high power combiner (17) are fixedly connected in said corresponding passive device region (10) by thermally conductive silicone rubber, respectively.

10. A radiation-resistant optical fiber amplifier according to claim 3, wherein the thickness of the aluminum alloy outer housing bottom shell (8) and the aluminum alloy outer housing cover plate (2) is 1.5mm;

The thickness of the lead inner shell bottom shell (5) and the lead inner shell cover plate (3) is 0.5mm.