CN113835163A

CN113835163A - Optical module

Info

Publication number: CN113835163A
Application number: CN202010511663.5A
Authority: CN
Inventors: 濮宏图
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-12-24
Anticipated expiration: 2040-06-08
Also published as: CN113835163B

Abstract

An optical module includes an optical fiber amplification assembly. The optical fiber amplification assembly includes an erbium doped fiber and an optical assembly. The optical assembly includes a fixing assembly, a first lens, an isolator, an optical prism, an optical filter, and a second lens. The fixing component is used for fixing the first optical fiber bundle and the second optical fiber bundle. The second optical fiber bundle, the first lens, the isolator and the optical prism are sequentially arranged, and the optical prism, the optical filter, the second lens and the first optical fiber bundle are sequentially arranged. The first optical fiber bundle includes a first optical fiber receiving the pump light, a second optical fiber receiving the first signal light and the pump light, and a third optical fiber outputting the second signal. The second optical fiber bundle includes a fourth optical fiber receiving the first signal light and a fifth optical fiber receiving the second signal light. The second optical fiber and the fifth optical fiber are connected by an erbium-doped optical fiber. The first optical fiber bundle and the second optical fiber bundle are both positioned at the same side of the optical assembly, so that the optical fiber bundles can be conveniently wound, and the volume is reduced; and the light inlet process and the light outlet process share one isolator, so that the size is further reduced.

Description

Optical module

Technical Field

The application relates to the technical field of optical fiber communication, in particular to an optical module.

Background

Due to the development of coherent optical communication technology from network communication to digital communication and the optical power attenuation caused by the use of high-speed chips, the design and use of optical fiber amplifiers in optical modules is an inevitable development direction at present.

The conventional erbium-doped fiber amplifier mainly comprises a section of erbium-doped fiber (about 10-30m in length) and a pump source. The working principle is as follows: the erbium-doped fiber generates stimulated radiation under the action of a pump source (with the wavelength of 980nm or 1480nm), and the radiated light changes along with the change of an input optical signal, which is equivalent to the input optical signal being amplified.

Because the external dimension of the optical module is usually very small, the traditional erbium-doped fiber amplifier has a larger dimension and cannot be directly arranged in the optical module. Therefore, miniaturization of the optical fiber amplifier is a real requirement.

Disclosure of Invention

The application provides an optical module, which realizes miniaturization of an optical fiber amplifier.

A light module, comprising:

the optical fiber amplification assembly comprises an erbium-doped optical fiber and an optical assembly and is used for amplifying signal light;

the optical assembly comprises a fixing assembly, a first lens, an isolator, an optical prism, an optical filter and a second lens, wherein the fixing assembly, the first lens, the isolator, the optical prism, the optical filter and the second lens are arranged on the base;

the fixing component is used for fixing the first optical fiber bundle and the second optical fiber bundle;

the first optical fiber bundle comprises a first optical fiber, a second optical fiber and a third optical fiber, and the second optical fiber bundle comprises a fourth optical fiber and a fifth optical fiber;

a first optical fiber for receiving the pump light;

the second optical fiber is connected with one end of the erbium-doped optical fiber and is used for receiving the first signal light transmitted by the optical filter and the pump light reflected by the optical filter;

the third optical fiber is used for outputting second signal light, wherein the second signal light is the amplified first signal light;

a fourth optical fiber for receiving the first signal light;

the fifth optical fiber is connected with the other end of the erbium-doped optical fiber and used for receiving the second signal light;

a first lens positioned between the second fiber bundle and the isolator;

an isolator between the first lens and the optical prism for preventing the first signal light and the second signal light from returning to the first lens;

an optical prism for changing a transmission direction of the first signal light and the second signal light;

the optical filter is positioned between the optical prism and the second lens and is used for transmitting the first signal light and the second signal light and reflecting the pump light;

and the second lens is positioned between the optical filter and the first optical fiber bundle and is used for coupling the first signal light, the second signal light and the pump light to the first optical fiber bundle.

Has the advantages that: an optical module includes a fiber optic amplification assembly. The optical fiber amplifying assembly is used for amplifying the signal light. The optical fiber amplification assembly includes an erbium doped fiber and an optical assembly. The optical assembly comprises a fixing assembly, a first lens, an isolator, an optical prism, an optical filter and a second lens, wherein the fixing assembly, the first lens, the isolator, the optical prism, the optical filter and the second lens are arranged on the base. The fixing component is used for fixing the first optical fiber bundle and the second optical fiber bundle, so that the first optical fiber bundle and the second optical fiber bundle are both positioned on the same side of the optical component. The isolator is used for preventing the first signal light and the second signal light from returning to the isolator of the first lens. The optical prism is used for changing the transmission direction of the first signal light and the second signal light. The optical filter is used for transmitting the first signal light, the second signal light and reflecting the pump light. The second lens is used for coupling the first signal light, the second signal light and the pump light to the first optical fiber bundle. Wherein the first lens is positioned between the second fiber bundle and the isolator; the isolator is positioned between the first lens and the optical prism; the optical filter is positioned between the optical prism and the second lens; the second lens is positioned between the optical filter and the first optical fiber bundle. The first optical fiber bundle includes a first optical fiber, a second optical fiber, and a third optical fiber. The second optical fiber bundle includes a fourth optical fiber and a fifth optical fiber. The first optical fiber is used for receiving the pumping light. And the second optical fiber is connected with one end of the erbium-doped optical fiber and is used for receiving the first signal light transmitted by the optical filter and the pump light reflected by the optical filter. The third optical fiber is used for outputting second signal light, wherein the second signal light is the amplified first signal light. The fourth optical fiber is for receiving the first signal light. And the fifth optical fiber is connected with the other end of the erbium-doped optical fiber and used for receiving the second signal light. The signal amplification process is as follows: the first signal light enters the optical prism through the fourth optical fiber, the first lens and the isolator, the transmission direction of the first signal light is changed under the action of the optical prism, and the first signal light is coupled to the second optical fiber through the transmission of the optical filter and the second lens. And the pump light emitted by the first optical fiber is reflected by the optical filter and the second lens and is also coupled to the second optical fiber. The second optical fiber has both signal light and pump light. The first signal light and the pump light in the second optical fiber enter the erbium-doped optical fiber, the first signal light is amplified in the erbium-doped optical fiber, and second signal light is obtained, wherein the second signal light is amplified. Since the second optical fiber and the fifth optical fiber are connected by the erbium-doped fiber, the fifth optical fiber receives the second signal light. The second signal light passes through the first lens, the isolator, the optical prism, the optical filter and the second lens, enters the third optical fiber and is output through the third optical fiber. Because the first signal light is used as the light in the light inlet process, the second signal light is used as the light in the light outlet process, and the transmission of the first signal light and the second signal light both pass through the same isolator. In the application, the erbium-doped optical fiber and the optical assembly comprise the fixing assembly, the first lens, the isolator, the optical prism, the optical filter and the second lens, so that the first optical fiber bundle and the second optical fiber bundle are both positioned at the same side of the optical assembly, the optical fiber bundle is convenient to wind, and the volume is reduced; and the light inlet process and the light outlet process can share one isolator, so that the size is further reduced, and the miniaturization of the optical fiber amplifier is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal;

fig. 2 is a schematic structural diagram of an optical network terminal;

fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present invention;

fig. 4 is a schematic view of a partial structure of an optical module according to an embodiment of the present invention;

fig. 5 is an exploded schematic view of a partial structure of an optical module according to an embodiment of the present invention;

fig. 6 is an exploded front view of a partial structure of a light module according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a fiber optic amplification assembly provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of an optical prism provided by an embodiment of the present invention;

FIG. 9 is an angle view of a fixing assembly according to an embodiment of the present invention;

FIG. 10 is an exploded view of FIG. 9;

FIG. 11 is a schematic view of another angle of the fixing assembly according to the embodiment of the present invention;

FIG. 12 is an exploded view of FIG. 11;

fig. 13 is a side view of a securing assembly provided by an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer, it is necessary to perform interconversion between the electric signal and the optical signal.

The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

one end of the optical fiber 101 is connected with a far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.

An optical port of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical signal connection with the optical network terminal 100; the optical module realizes the interconversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104, which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.

At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, provides data signals for the optical module, and receives the data signals from the optical module, and the common upper computer of the optical module also comprises an optical line terminal and the like.

Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 has a circuit board 105, and a cage 106 is disposed on a surface of the circuit board 105; an electric connector is arranged in the cage 106 and used for connecting an electric port of an optical module such as a golden finger; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into the optical network terminal, specifically, the electrical port of the optical module is inserted into the electrical connector inside the cage 106, and the optical port of the optical module is connected to the optical fiber 101.

The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, held by the cage, and the heat generated by the optical module is conducted to the cage 106 and then diffused by the heat sink 107 on the cage.

Fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present invention. As shown in fig. 3, an optical module 200 provided in an embodiment of the present invention includes an upper housing 201, a lower housing 202, and an unlocking member 203;

the upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a cover plate, and the cover plate covers two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned at two sides of the cover plate and are perpendicular to the cover plate, and the two side walls are combined with the two side plates to realize that the upper shell covers the lower shell.

The two openings may be two openings (204, 205) located at the same end of the optical module, or two openings located at different ends of the optical module; one opening is an electric port 204, and a gold finger of the circuit board extends out of the electric port 204 and is inserted into an upper computer such as an optical network terminal; the other opening is an optical port 205 for external optical fiber access to connect with an optical transceiver inside the optical module; photoelectric devices such as a circuit board and an optical transceiver are positioned in the packaging cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that devices such as a circuit board, an optical transceiver and the like can be conveniently installed in the shells, and the upper shell and the lower shell form an outermost packaging protection shell of the optical module; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the housing of the optical module is not made into an integrated component, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component cannot be installed, and the production automation is not facilitated.

The unlocking component 203 is located on the outer wall of the wrapping cavity/lower shell 202, and is used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

The unlocking component 203 is provided with a clamping component matched with the upper computer cage; the end of the unlocking component can be pulled to enable the unlocking component to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer by a clamping component of the unlocking component; by pulling the unlocking component, the clamping component of the unlocking component moves along with the unlocking component, so that the connection relation between the clamping component and the upper computer is changed, the clamping relation between the optical module and the upper computer is released, and the optical module can be drawn out from the cage of the upper computer.

Fig. 4 is a schematic view of a partial structure of an optical module according to an embodiment of the present invention. Fig. 5 is an exploded schematic view of a partial structure of an optical module according to an embodiment of the present invention. Fig. 6 is an exploded front view of a partial structure of a light module according to an embodiment of the present invention. Fig. 7 is a schematic diagram of an optical fiber amplifying assembly according to an embodiment of the present invention. Fig. 8 is a schematic diagram of an optical prism provided in an embodiment of the present invention. As shown in fig. 4 to 8, in the embodiment of the present invention, the optical module includes a fiber amplification module, and the fiber amplification module includes an optical module 300 and an erbium-doped fiber 400, and is configured to amplify the signal light.

The optical assembly 300 includes a fixing assembly 301, a first lens 302, an isolator 303, an optical prism 304, an optical filter 306, and a second lens 307, which are disposed on a base 500.

The erbium-doped fiber 400 is configured to amplify the first signal light to obtain a second signal light. The second signal light is the amplified first signal light. Because the first signal light and the pump light exist in the erbium-doped fiber 400 at the same time, the erbium-doped fiber 400 transfers the energy of the pump light to the first signal light, so that the amplification of the first signal light is realized, and the second signal light is obtained.

The base 500 is a whole body, and the shape of the base may be a rectangular parallelepiped, a square, or the like, and the fixing member 301, the second lens 302, the isolator 303, the optical prism 304, the optical filter 306, and the second lens 307 may be fixed on the same horizontal plane, so as to facilitate the transmission of light.

A fixing assembly 301 for fixing a first optical fiber bundle 308 and a second optical fiber bundle 309. Specifically, two fixing grooves are formed in the fixing assembly 301, and the first optical fiber bundle 308 and the second optical fiber bundle 309 respectively and correspondingly traverse the two fixing grooves to fix the first optical fiber bundle 308 and the second optical fiber bundle 309.

The first optical fiber bundle 308 includes a first optical fiber, a second optical fiber, and a third optical fiber.

The first optical fiber is used for receiving the pumping light. Wherein the pump light is emitted by the pump source. The pumping source may be disposed within the optical module or outside the optical module. The pump source may be 980nm or 1480 nmLD. The pump source emits pump light, the pump light is emitted into the optical fiber assembly through the first optical fiber, and the wavelength of the pump light is smaller than the wavelength of the first signal light and the wavelength of the second signal light.

And a second optical fiber connected to one end of the erbium-doped fiber 400, for receiving the first signal light transmitted through the optical filter 306 and the pump light reflected by the optical filter 306. The first signal light is emitted from the second optical fiber bundle 309, enters the optical filter 306 through the first lens 302, the isolator 303 and the optical prism 304, is transmitted to the second lens 307 through the optical filter 306, and is coupled into the second optical fiber under the action of the second lens 307. The pump light is emitted from the pump source, enters the filter 306 through the second lens 307, is emitted to the second lens 307 through the filter 306, and is coupled into the second optical fiber under the action of the second lens 307.

And a third optical fiber for outputting the second signal light. The second signal light is emitted from the erbium-doped fiber, enters the optical filter 306 through the second optical fiber bundle 309, the first lens 302, the isolator 303 and the optical prism 304, is transmitted to the second lens 307 through the optical filter 306, and is coupled to the third optical fiber under the action of the second lens 307.

The optical fiber amplifying assembly can be arranged near the optical emission submodule and is used for amplifying the first signal light emitted by the optical emission submodule; the first signal light can be amplified by the first signal light emitted into the light receiving sub-module. When the optical fiber amplifying assembly is used for amplifying the first signal light emitted by the light emission submodule, the third optical fiber is connected with the external optical fiber. At this time, the third optical fiber emits the second signal light to the external optical fiber. When the optical fiber amplifying assembly is used for amplifying the first signal light transmitted into the light receiving sub-module, the third optical fiber is connected with the light receiving sub-module. At this time, the third optical fiber transmits the second signal light to the optical receive sub-module.

The second fiber bundle 309 includes a fourth fiber and a fifth fiber.

And a fourth optical fiber for receiving the first signal light.

The optical fiber amplifying assembly can be arranged near the optical emission submodule and is used for amplifying the first signal light emitted by the optical emission submodule; the first signal light can be amplified by the first signal light emitted into the light receiving sub-module. When the optical fiber amplifying assembly is used for amplifying the first signal light emitted by the light emission submodule, the fourth optical fiber is connected with the light emission submodule. At this time, the fourth optical fiber receives the first signal light emitted by the optical emission sub-module. When the optical fiber amplifying assembly is used for amplifying the first signal light transmitted into the light receiving sub-module, the fourth optical fiber is connected with the external optical fiber. At this time, the fourth optical fiber receives the first signal light emitted from the external optical fiber.

And a fifth optical fiber connected to the other end of the erbium-doped fiber 400 for receiving the second signal light. The second signal light is the first signal light amplified by the erbium-doped fiber 400. The second signal light is incident on the third optical fiber of the first optical fiber bundle 308 via the fifth optical fiber, the first lens 302, the isolator 303, the optical prism 304, the optical filter 306, and the second lens 307.

The second optical fiber bundle 309 may include a sixth optical fiber in addition to the fourth and fifth optical fibers. The sixth fiber is not connected to any device.

The cladding diameter of the fibers within the first bundle 308 and the second bundle 309 is 80 microns. Such an optical fiber having a cladding diameter of 80 μm has the following advantages over a conventional optical fiber having a cladding diameter of 125 μm: (1) the working distance (the distance between the first lens and the second lens) is lengthened without too large fiber coupling loss; (2) the 80 micron optical fiber has small bending loss and small volume, and is suitable for winding and fixing the optical fiber in a small space in a packaging shell.

The first lens 302 is located between the second optical fiber bundle 309 fixed to the fixing member 301 and the isolator 303, and is configured to collimate the signal light emitted from the second optical fiber bundle 309 into collimated light. Specifically, the first lens 302 is a collimating lens, and can collimate the light emitted from the second fiber bundle 309 into collimated light.

Since the fourth optical fiber is configured to receive the first signal light, and the fifth optical fiber is configured to receive the second signal light, the first lens 302 is configured to collimate the signal light emitted by the second optical fiber bundle 309 into collimated light, which specifically means: the first lens 302 collimates the first signal light emitted from the fourth optical fiber into first collimated light, and the first lens 302 collimates the second signal light emitted from the fifth optical fiber into second collimated light.

And an isolator 303 between the first lens 302 and the optical prism 304, for preventing the first signal light and the second signal light from returning to the first lens 302. Specifically, since the isolator 303 allows light to pass in a single direction and blocks light in the opposite direction, the first signal light and the second signal light are prevented from returning to the first lens 302. At this time, the first signal light is first collimated light, and the second signal light is second collimated light.

And an optical prism 304 at the other end (the end opposite to the fixing direction of the fixing member 301) of the base 300 for changing the transmission direction of the first signal light and the second signal light. The first signal light and the second signal light perpendicularly enter the transmission surface of the optical prism 304, and continue to enter the first internal total reflection surface of the optical prism 304. The first signal light and the second signal light are totally reflected on the first internal total reflection surface of the optical prism 304 and continuously enter the optical prism 304 to the second internal total reflection surface of the optical prism 304. The first signal light and the second signal light are reflected at the second internal total reflection surface and exit the optical prism 304 perpendicularly through the transmission surface. At this time, an angle between the first signal light incident on the optical prism 304 and the first signal light emitted through the optical prism 304 is 180 °. Accordingly, the optical prism 304 changes the transmission direction of the first signal light and the second signal light.

And an optical filter 306 between the optical prism 304 and the second lens 307 for transmitting the first signal light, the second signal light, and the pump light. Specifically, since the wavelength of the pump light is smaller than the wavelengths of the first signal light and the second signal light, the optical filter 306 may transmit the first signal light and the second signal light to the second lens 307, and may reflect the pump light to the second lens 307.

And a second lens 307, located between the filter 306 and the first optical fiber bundle 308 fixed on the fixing component 301, for coupling the first signal light, the second signal light and the pump light to the first optical fiber bundle 308. Specifically, the second lens 307 is a collimating lens, and is configured to couple the first signal light to the second fiber of the first fiber bundle 308, couple the second signal light to the third fiber of the first fiber bundle 308, and couple the pump light to the second fiber of the first fiber bundle 308.

In order to detect the optical power of the first signal light and the second signal light, the optical assembly further includes a photodetector 305. And a photodetector 305 disposed on the base 500 and between the optical prism 304 and the optical filter 306 for detecting optical power. Specifically, the photodetector 305 includes a photosurface. The photo-sensitive surface of the photodetector 305 receives the reflected light and converts the reflected light into an electrical signal. The photodetector 305 leads an electrical signal out of the wire to provide optical power reading and reading to achieve optical power detection. When the reflected light received by the photodetector 305 is part of the first signal light, the photodetector 305 detects the signal light without amplification at this time. When the reflected light received by the photodetector 305 is part of the second signal light, the photodetector 305 detects the amplified signal light at this time. The amplification factor of the second signal light can be obtained based on the optical power of the first signal light and the second signal light detected by the photodetector 305.

The reflected light received by the photosensitive surface of the photodetector 305 is a small portion of the first signal light or a small portion of the second signal light reflected by the optical prism 304. In order to make the optical prism 304 reflect a small portion of the first signal light or a small portion of the second signal light, a power splitting surface is provided in the optical prism 304. And a power splitting surface for reflecting and transmitting the incident light to obtain reflected light and transmitted light, wherein the reflected light is transmitted to the photodetector 305, and the transmitted light is totally reflected at the total reflection surface and transmitted to the optical filter 306. Specifically, the first signal light and the second signal light are totally reflected by the first total internal reflection surface and continuously emitted to the power splitting surface. A small portion of the first signal light and a small portion of the second signal light are reflected by the power splitting surface, and the reflected light is emitted perpendicularly to the light transmission surface and incident on the photodetector 305. Most of the first signal light and most of the second signal light are transmitted, the transmitted light enters the second internal total reflection surface, the transmitted light is totally reflected on the second internal total reflection surface, and the reflected light perpendicularly exits the light transmission surface and enters the optical filter 306.

In the present application, the specific process of the optical fiber amplification component for realizing optical fiber amplification is as follows: the first signal light is transmitted to the first lens 302 through the fourth optical fiber in the second optical fiber bundle 309, and enters the optical prism 304 through the first lens 302 and the isolator 303, the optical prism 304 changes the transmission direction of the first signal light, so that the first signal light enters the optical filter 306, and the first signal light is transmitted to the second lens 307 through the optical filter 306 and coupled to the second optical fiber in the first optical fiber bundle 308.

The pump light is emitted by the pump source, the pump light is transmitted to the second lens 307 through the first optical fiber in the first optical fiber bundle 308, the pump light is coupled to the optical filter 306 after being coupled by the second lens 307, the pump light is reflected to the second lens 307 under the action of the optical filter 306, and the reflected light of the pump light is also coupled to the second optical fiber in the first optical fiber bundle 308.

The second optical fiber in the first optical fiber bundle 308 emits first signal light and pump light, the first signal light is amplified by the erbium-doped fiber 400 to obtain second signal light, and the second signal light is transmitted to the fifth optical fiber in the second optical fiber bundle 309. The fifth optical fiber in the second optical fiber bundle 309 emits a second signal light, the second signal light enters the optical prism 304 through the first lens 302 and the isolator 303, the optical prism 304 changes the transmission direction of the second signal light, so that the second signal light enters the optical filter 306, and the second signal light is transmitted to the second lens 307 through the optical filter 306 and coupled to the third optical fiber in the first optical fiber bundle 308.

As can be seen from the above description, in order to realize the optical fiber amplification, the first signal light emitted from the fourth optical fiber of the second optical fiber bundle 309 needs to be coupled into the second optical fiber of the first optical fiber bundle 308 through the first lens 302, the isolator 303, the optical prism 304, the optical filter 306, and the second lens 307. The pumping light from the first fiber is reflected into the second fiber of the first fiber bundle 308 via the second lens 307, the filter 306 and the second lens 307. The erbium-doped fiber connected with the second fiber is internally provided with pump light and first signal light, so that the first signal light is amplified to obtain second signal light. The second signal light from the fifth optical fiber connected to the erbium-doped fiber is coupled into the third optical fiber of the first optical fiber bundle 308 through the first lens 302, the isolator 303, the optical prism 304, the optical filter 306, and the second lens 307.

In the embodiment of the present application, the plane formed by the fourth and fifth optical fibers of the second optical fiber bundle 309 is parallel to the plane formed by the second and third optical fibers of the first optical fiber bundle 308.

Since only the plane formed by the fourth and fifth fibers of the second fiber bundle 309 is parallel to the plane formed by the second and third fibers of the first fiber bundle 308, the third fiber in the first fiber bundle 308 may not accurately receive the light coupled by the second lens 307. In order to realize that the second fiber and the third fiber in the first fiber bundle 308 can both correspondingly receive the light coupled by the second lens 307, the distance between the fourth fiber and the fifth fiber of the second fiber bundle 309 is equal to the distance between the second fiber and the third fiber of the first fiber bundle 308.

Since the plane formed by the fourth fiber and the fifth fiber of the second fiber bundle 309 is parallel to the plane formed by the second fiber and the third fiber of the first fiber bundle 308, and the distance between the fourth fiber and the fifth fiber of the second fiber bundle 309 is equal to the distance between the second fiber and the third fiber of the first fiber bundle 308, the second fiber of the first fiber bundle 308 receives the first signal light emitted by the fourth fiber of the second fiber bundle 309, and the third fiber of the first fiber bundle 308 receives the second signal light emitted by the fifth fiber of the second fiber bundle 309.

Fig. 9 is a schematic view of an angle structure of a fixing assembly according to an embodiment of the present invention. Fig. 10 is an exploded view of fig. 9. Fig. 11 is a schematic structural view of another angle of the fixing assembly according to the embodiment of the present invention. Fig. 12 is an exploded view of fig. 11. Fig. 13 is a side view of a securing assembly provided by an embodiment of the present invention. As shown in fig. 9-13, in an embodiment of the present invention, the securing assembly 301 includes a base plate 3011 and a cover plate 3012. In particular, the method comprises the following steps of,

the base plate 3011 is disposed at one end of the base 300 and connected to the base 300. The cover 3012 encloses two fixing slots with the base 3011, and the two fixing slots are used to fix the first optical fiber bundle 308 and the second optical fiber bundle 309, respectively.

The lower surface of the cover plate 3012 is provided with two first grooves 30121, and a second groove may or may not be provided on the side of the bottom plate 3011 contacting with the cover plate 3012, where the second groove is provided corresponding to the first groove. When the bottom plate 3011 is provided with a second groove, the cover plate 3012 covers the bottom plate 3011, and the first groove 30121 and the second groove form two first fixing grooves. When the bottom plate 3011 is not provided with the second groove, the cover plate 3012 covers the bottom plate 3011, the first groove 30121 and the bottom plate 3011 form a first fixing slot and a second fixing slot, and the first fixing slot is used to fix the first optical fiber bundle 308, and the second fixing slot is used to fix the second optical fiber bundle 309.

As shown in fig. 7-11, in the embodiment of the present invention, one end of each of the first optical fiber bundle 308 and the second optical fiber bundle 309 has no protective layer, i.e. only the plurality of bare optical fibers.

To secure the plurality of optical fibers in the first bundle 308 to the first retaining groove and the plurality of optical fibers in the second bundle 309 to the second retaining groove, the first groove 30121 includes two intersecting surfaces. The included angle between the two intersecting surfaces is between 0 and 180 degrees. When the number of optical fibers in the first optical fiber bundle 308 and the second optical fiber bundle 309 is 3, in order to accurately fix the three optical fibers to the first groove 30121, the angle between two intersecting surfaces of the first groove may be set to 60 °.

An optical module includes a fiber optic amplification assembly. The optical fiber amplifying assembly is used for amplifying the signal light. The optical fiber amplification assembly includes an erbium doped fiber and an optical assembly. The optical assembly comprises a fixing assembly, a first lens, an isolator, an optical prism, an optical filter and a second lens, wherein the fixing assembly, the first lens, the isolator, the optical prism, the optical filter and the second lens are arranged on the base. The fixing component is used for fixing the first optical fiber bundle and the second optical fiber bundle, so that the first optical fiber bundle and the second optical fiber bundle are both positioned on the same side of the optical component. The isolator is used for preventing the first signal light and the second signal light from returning to the isolator of the first lens. The optical prism is used for changing the transmission direction of the first signal light and the second signal light. The optical filter is used for transmitting the first signal light, the second signal light and reflecting the pump light. The second lens is used for coupling the first signal light, the second signal light and the pump light to the first optical fiber bundle. Wherein the first lens is positioned between the second fiber bundle and the isolator; the isolator is positioned between the first lens and the optical prism; the optical filter is positioned between the optical prism and the second lens; the second lens is positioned between the optical filter and the first optical fiber bundle. The first optical fiber bundle includes a first optical fiber, a second optical fiber, and a third optical fiber. The second optical fiber bundle includes a fourth optical fiber and a fifth optical fiber. The first optical fiber is used for receiving the pumping light. And the second optical fiber is connected with one end of the erbium-doped optical fiber and is used for receiving the first signal light transmitted by the optical filter and the pump light reflected by the optical filter. The third optical fiber is used for outputting second signal light, wherein the second signal light is the amplified first signal light. The fourth optical fiber is for receiving the first signal light. And the fifth optical fiber is connected with the other end of the erbium-doped optical fiber and used for receiving the second signal light. The signal amplification process is as follows: the first signal light enters the optical prism through the fourth optical fiber, the first lens and the isolator, the transmission direction of the first signal light is changed under the action of the optical prism, and the first signal light is coupled to the second optical fiber through the transmission of the optical filter and the second lens. And the pump light emitted by the first optical fiber is reflected by the optical filter and the second lens and is also coupled to the second optical fiber. The second optical fiber has both signal light and pump light. The first signal light and the pump light in the second optical fiber enter the erbium-doped optical fiber, the first signal light is amplified in the erbium-doped optical fiber, and second signal light is obtained, wherein the second signal light is amplified. Since the second optical fiber and the fifth optical fiber are connected by the erbium-doped fiber, the fifth optical fiber receives the second signal light. The second signal light passes through the first lens, the isolator, the optical prism, the optical filter and the second lens, enters the third optical fiber and is output through the third optical fiber. Because the first signal light is used as the light in the light inlet process, the second signal light is used as the light in the light outlet process, and the transmission of the first signal light and the second signal light both pass through the same isolator. In the application, the erbium-doped optical fiber and the optical assembly comprise the fixing assembly, the first lens, the isolator, the optical prism, the optical filter and the second lens, so that the first optical fiber bundle and the second optical fiber bundle are both positioned at the same side of the optical assembly, the optical fiber bundle is convenient to wind, and the volume is reduced; and the light inlet process and the light outlet process can share one isolator, so that the size is further reduced, and the miniaturization of the optical fiber amplifier is realized.

The same and similar parts among the embodiments in the specification are referred to each other. It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A light module, comprising:

the first optical fiber is used for receiving the pump light;

the fourth optical fiber is used for receiving the first signal light;

the fifth optical fiber is connected with the other end of the erbium-doped optical fiber and used for receiving second signal light;

the first lens is positioned between the second optical fiber bundle and the isolator;

the isolator is positioned between the first lens and the optical prism and used for preventing the first signal light and the second signal light from returning to the first lens;

the optical prism is used for changing the transmission direction of the first signal light and the second signal light;

the second lens is located between the optical filter and the first optical fiber bundle and is used for coupling the first signal light, the second signal light and the pump light to the first optical fiber bundle.

2. The optical module of claim 1, wherein coupling the first signal light, the second signal light, and the pump light to the first fiber bundle refers to: coupling both the first signal light and the pump light to a second fiber of the first fiber bundle, coupling the second signal light to a third fiber of the first fiber bundle.

3. The light module of claim 1, wherein the optical assembly further comprises:

and the photoelectric detector is used for detecting the optical power.

4. The light module of claim 3, wherein the optical prism comprises a power splitting surface;

the power light splitting surface is used for reflecting and transmitting incident light to obtain reflected light and transmitted light, wherein the reflected light irradiates the photoelectric detector, and the transmitted light is subjected to total reflection on the inner total reflection surface and irradiates the optical filter.

5. The light module of claim 1, further comprising:

and the pumping source is used for emitting the pumping light, wherein the wavelength of the pumping light is smaller than the wavelengths of the first signal light and the second signal light.

6. The optical module of claim 1, wherein cladding diameters of optical fibers within the first and second fiber bundles are 80 microns.

7. The optical module of claim 1, wherein a first plane of the second and third optical fibers is parallel to a second plane of the fourth and fifth optical fibers.

8. The optical module of claim 7, wherein a distance between the second optical fiber and the third optical fiber is equal to a distance between the fourth optical fiber and the fifth optical fiber.

9. The light module of claim 1, wherein the fixture assembly comprises a base plate and a cover plate;

the bottom plate is arranged at one end of the base and is connected with the base;

the cover plate and the bottom plate form two fixing grooves;

the lower surface of the cover plate is provided with two first grooves.

10. The light module of claim 8, wherein the first groove comprises two intersecting surfaces, and an included angle between the two intersecting surfaces is 60 °.