WO2010060293A1 - System and method for pumping redundancy protection - Google Patents

Abstract

A system and a method for pumping redundancy protection, wherein the system includes: first path fiber (501), second path fiber (502), first pumping laser (503) and second pumping laser (504), the first path fiber (501) includes: first erbium doped fiber (509), first fiber splitter (505), and first wavelength division multiplexer (506), and the second path fiber (502) includes: second erbium doped fiber (510), second fiber splitter (507), and second wavelength division multiplexer (508). The method includes: splitting first pumping laser to first split pumping laser and second split pumping laser that are respectively input to erbium doped fibers in two path fibers (1001); splitting second pumping laser to third split pumping laser and fourth split pumping laser that are respectively input to erbium doped fibers in two path fibers (1002). The invention realizes pumping redundancy protection and improves the reliability of fiber amplification system by arranging fiber splitters and wavelength division multiplexers in two path fibers reasonably and making two path pumping lasers be redundant to each other.

Description

 System and method for pump redundancy protection

 This application claims priority to Chinese Patent Application No. 200810227195.8, entitled "System and Method for Pump Redundancy Protection", filed on November 25, 2008, the entire contents of which is incorporated herein by reference. In the application.

Technical field

 The present invention relates to the field of optical communications, and in particular to a system and method for pump redundancy protection. Background technique

 A more mature fiber amplifier used in fiber-optic communication systems is an erbium-doped fiber amplifier (EDFA, Erbium-Doped)

Fiber Amplifier), as shown in Figure 1, the erbium-doped fiber amplifier requires at least a pump laser, a wavelength division multiplexer.

 (WDM, Wavelength Division Multiplexing) and potassium-doped fiber (EDF, Erbium-Doped Fiber). Among them, the role of the pump laser is to provide excitation energy to the gain medium. In the erbium-doped fiber amplifier, the pump laser in the 980 nm band and the 1480 nm band is often used. A wavelength division multiplexer is typically a three-port device that couples the pump laser and signal light into the same fiber for transmission. The erbium-doped fiber is the gain medium of the erbium-doped fiber amplifier. After absorbing the pump laser, the erbium ions will transition to the excited state. When the signal photon passes through the erbium-doped fiber, stimulated radiation will occur, which is the same as the signal photon. The frequency, the same direction, and the same polarized photons realize the amplification of the signal light.

 In a communication system composed of a fiber amplifier, the pump laser is a device with a relatively high failure rate. Failure of the pump laser may cause the erbium-doped fiber to fail to operate normally, resulting in communication interruption. To solve this problem, a pump redundancy protection method is usually used, and a redundant pump laser is used to prevent the single pump laser from failing and the communication of the entire network is interrupted.

 There are three design methods for pump redundancy protection in the prior art:

 In the prior art 1, as shown in FIG. 2, two pump lasers are provided in two optical fibers, and a 2×2 structure fiber coupler is used between the wavelength division multiplexer and the pump laser, and each pump is used. The laser provides half the pump energy for each of the two amplifiers. When one of the pump lasers fails, the other pump laser can still supply energy to the erbium-doped fiber in the two fibers, ensuring that fiber communication is not interrupted.

 Prior Art 2, as shown in Figure 3, a two-pump laser is coupled together using a polarization combiner (PBC) and then connected to a wavelength division multiplexer. When one of the pump lasers fails, half of the pump laser input is still applied to the erbium-doped fiber, which maintains the erbium-doped fiber with a certain amplification capability.

In the prior art 3, as shown in FIG. 4, a fiber splitter and a fiber coupler are respectively disposed in two optical fibers, and the pump laser passes through The optical fiber splitter is divided into two sub-pumped lasers, and the sub-pump laser of one pump laser and the sub-pump laser of the other pump laser are coupled together by a fiber coupler for exciting the fiber coupler. The erbium-doped fiber of the fiber. The coupled pump laser contains the output power of each of the two pump lasers.

 After researching the prior art, the inventors found that:

 In the prior art 1, the 2 X 2 structure fiber coupler used is a single point of failure. When the coupler fails, the pump lasers input to the two fiber amplifiers are simultaneously interrupted, causing interruption of the two fiber communication.

 In the prior art two, two pump lasers can only supply energy for the amplifier of one optical fiber, and the cost is high, and the polarization combiner technology is not mature enough. In practical applications, the failure rate is high and the device loss is relatively large.

 In the prior art three, it is difficult to couple the two-way pump lasers, and there are usually three coupling methods: The first one uses a polarization combiner to combine the waves, but in this method, the optical fiber splitter must be The polarization-maintaining fiber splitter is technically difficult to implement; in addition, there is a problem that the polarization combiner has large coupling loss and high failure rate. The second method uses a coupler to combine the waves, but the combined wave produces a large loss, which wastes at least 50% of the pump energy. The third is to use a wavelength division multiplexer to combine the waves. The premise is that the wavelengths of the two pump lasers are different. Since the bandwidth of the pump laser is narrow, the multiplexing is difficult, and a large coupling loss is also generated.

Summary of the invention

 In order to improve the reliability of the optical fiber transmission device, an embodiment of the present invention provides a system for pump redundancy protection, where the system includes:

 a first optical fiber, a second optical fiber, a first pump laser, and a second pump laser, the first optical fiber comprising a first erbium doped fiber, a first fiber splitter, and a first wavelength division multiplexer, The second optical fiber includes a second erbium doped fiber, a second fiber splitter, and a second wavelength division multiplexer;

 The first fiber splitter is configured to receive a first pump laser input by the first pump laser, and divide the first pump laser into a first pump laser and a second pump laser Transmitting the first sub-pumped laser to the first erbium-doped fiber, and inputting the second sub-pumped laser to the second wavelength division multiplexer;

 The second fiber splitter is configured to receive a second pump laser input by the second pump laser, and divide the second pump laser into a third pump laser and a fourth pump laser Transmitting the third sub-pumped laser to the second erbium-doped fiber, and inputting the fourth sub-pumped laser to the first wavelength division multiplexer;

 The first wavelength division multiplexer is configured to receive the fourth sub-pump laser input by the second fiber optic splitter, and input the fourth sub-pump laser to the first erbium Optical fiber

The second wavelength division multiplexer is configured to receive the second sub-pump laser input by the first fiber optic splitter, and The second divided pump laser is input to the second erbium doped fiber.

 The embodiment of the invention further provides a method for pump redundancy protection, the method comprising:

 Dividing the first pump laser into a first sub-pump laser and a second sub-pump laser, inputting the first sub-pump laser to the first erbium fiber on the first fiber, and the second a sub-pumped laser light is input to a second erbium-doped fiber on the second optical fiber via the second wavelength division multiplexer;

 Dividing the second pump laser into a third sub-pump laser and a fourth sub-pump laser, and inputting the third sub-pump laser to the second erbium-doped fiber, and the fourth sub-pump laser Input to the first erbium doped fiber via a first wavelength division multiplexer.

 In the embodiment of the present invention, the two pump lasers are mutually redundant by a fiber splitter and a wavelength division multiplexer which are properly arranged in two optical fibers, so that when one pump laser fails, another pump can be passed. The Pu laser supplies pump lasers for two erbium-doped fibers. The two fiber amplifiers still maintain a certain amplification function, which realizes the function of pump redundancy protection and improves the reliability of the fiber amplifier system.

DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

 1 is a structural view of a prior art erbium doped fiber amplifier;

 2 is a structural diagram of a pump redundantly protected optical fiber amplifier of the prior art;

 3 is a structural diagram of a pump redundantly protected optical fiber amplifier of the prior art 2;

 4 is a structural diagram of a pump redundantly protected optical fiber amplifier of the prior art 3;

 5 is a structural diagram of a system of a first type of pump redundancy protection according to Embodiment 1 of the present invention;

 6 is a structural diagram of a system of a second type of pump redundancy protection according to Embodiment 1 of the present invention;

 FIG. 7 is a schematic diagram of the function of the optical fiber splitter when the signal light is forwardly transmitted according to Embodiment 1 of the present invention; FIG. 8 is a schematic diagram of the function of the optical fiber splitter when the signal light is reversely transmitted according to Embodiment 1 of the present invention; 9 is a system structural diagram of pump redundancy protection provided by Embodiment 2 of the present invention;

 Figure 10 is a flow chart showing a method of pump redundancy protection according to Embodiment 3 of the present invention;

11 is a flow chart of a method of pump redundancy protection according to Embodiment 4 of the present invention. detailed description The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 Example 1

 Embodiments of the present invention provide a system for pump redundancy protection. Referring to FIG. 5, a first optical fiber 501, a second optical fiber 502, a first pump laser 503, and a second pump laser 504 are included.

 The first optical fiber 501 includes: a first optical fiber splitter 505, a first wavelength division multiplexer 506, and a first erbium-doped optical fiber 509, where the second optical fiber 502 includes: a second optical fiber splitter 507, The second wavelength division multiplexer 508 and the second erbium doped fiber 510. The first pump laser 503 and the second pump laser 504 are mutually redundant, both providing excitation energy for the first erbium doped fiber 509 and the second erbium doped fiber 510.

 In the present embodiment, the first fiber splitter 505 is connected to the first pump laser 503, the first erbium doped fiber 509 and the second wavelength division multiplexer 508 on the first optical fiber, and the first wavelength division multiplexing The device 506 is connected to the second fiber splitter 507, the first erbium doped fiber 509 on the first fiber; the second fiber splitter 507 and the second pump laser 504, and the second erbium on the second fiber. The fiber 510 is coupled to a first wavelength division multiplexer 506 that is coupled to the first fiber splitter 505 and the second erbium fiber 510 on the second fiber.

 a first fiber splitter 505, configured to receive a first pump laser input by the first pump laser 503, and divide the first pump laser into a first pump laser and a second pump laser, The sub-pump laser is input to the first erbium doped fiber 509, and the second sub-pump laser is input to the second wavelength division multiplexer 508;

 a second fiber splitter 507, configured to receive a second pump laser input by the second pump laser 504, and divide the second pump laser into a third pump laser and a fourth pump laser, and to The sub-pumped laser is input to the second erbium doped fiber 510, and the fourth sub-pumped laser is input to the first wavelength division multiplexer 506;

 The first wavelength division multiplexer 506 is configured to receive the fourth sub-pump laser input by the second fiber splitter 507, and input the fourth sub-pump laser to the first erbium doped fiber 509;

 The second wavelength division multiplexer 508 is configured to receive the second sub-pump laser input from the first fiber optic splitter 505 and input the second sub-pump laser into the second erbium doped fiber 510.

In this embodiment, in the first optical fiber 501, the specific positions of the first optical fiber splitter 505 and the first wavelength division multiplexer 506 can be configured in two ways, but the prerequisites are: In one optical fiber 501, the positions of the first fiber splitter 505 and the first wavelength division multiplexer 506 are located in front of the isolator and the gain flattening filter in the transmission direction to prevent noise light from being generated at the output end of the signal light; At the same time, the positions of the first fiber splitter 505 and the first wavelength division multiplexer 506 are divided. Do not connect the two pumped lasers to the erbium-doped fiber on both sides of the erbium-doped fiber, because the two-way pump laser is input on the same side of the erbium-doped fiber. The coupling of the pump laser is performed.

 After the foregoing preconditions are met, the first fiber splitter 505 and the first wavelength division multiplexer 506 are disposed in the first path fiber 501 at a position: the first fiber splitter 505 is adjacent to the input end, and the second The wavelength division multiplexer 508 is adjacent to the output; or the first fiber splitter 505 is adjacent to the output, and the second wavelength division multiplexer 508 is adjacent to the input. The two setup methods have essentially the same effect on exciting the erbium doped fiber.

 In the second optical fiber 502, the specific positions of the second optical fiber splitter 507 and the second wavelength division multiplexer 508 are set in the same manner, and will not be described again.

 Therefore, in the case that the above preconditions are satisfied, the system structure of the present invention can be:

 (1) Referring to Fig. 5, the structure of the first pump redundancy protection system of the present embodiment. In the first optical fiber 501, the first optical fiber splitter 505 is disposed adjacent to the input end, and the first wavelength division multiplexer 506 is adjacent to the output end; in the second optical fiber 502, the second optical fiber splitter 507 is disposed adjacent to the output. End, the second wavelength division multiplexer 508 is near the input.

 (2) Referring to Fig. 6, the structure of the second pump redundancy protection system of the present embodiment. In the first optical fiber 501, the first optical fiber splitter 505 is disposed adjacent to the input end, and the first wavelength division multiplexer 506 is adjacent to the output end; in the second optical fiber 502, the second optical fiber splitter 507 is disposed adjacent to the input. End, the second wavelength division multiplexer 508 is close to the output.

 In this embodiment, the optical fiber splitter is a 4-port device having two input terminals and two output terminals. Referring to FIG. 7, the signal light forward transmission is taken as an example for description, and the signal light input port is P1. The pump laser input port is P4, P2 and P3 are two output ports. Ideally, the signal light and the separated one-way pump laser are output through the P2 port, and the other sub-pump laser is output through the P3 port. However, in reality, there is a possibility that the signal light is also separated by the fiber splitter, that is, part of the signal light is separated and output from the P4 port. The schematic diagram of the reverse transmission of the signal light is shown in Fig. 8. The principle is the same as the forward transmission, and will not be described again.

 Therefore, in order to improve the performance of signal optical transmission when the optical fiber splitter is installed in the optical fiber, the optical fiber splitter should satisfy the following conditions as follows: When receiving the signal light in the optical fiber, the signal light is not separated, and the signal light is directly output. In the original fiber. When the pump laser is received, the pump laser is separated and output, and when the pump laser is separated, the power of the separated two-way pump lasers should be equal or close, that is, the sub-pumped laser and the original The power ratio of the pump laser is within a preset range, such as in the range of 40% to 60%.

 Specifically, the following measures can be taken: The fiber splitter adopts the fiber fusion taper technology; the appropriate signal light and the wavelength of the pump laser are selected.

According to the principle of fusion taper coupling, when the core radius of the cone region, the core pitch of the cone region, and the core refractive index respectively satisfy certain conditions, it can be made: In the fiber splitter, when the wavelength of the input light is close At 1550 nm, the input light is basically not Under the influence of the fiber splitter, most of the light will be input into the original fiber after passing through the fiber splitter; when the wavelength of the input light is close to 980 nm, the fiber splitter will be separated into two equal or close powers. The sub-laser.

 Therefore, the fiber splitter is realized by the fiber fusion taper technology, and when the signal light wavelength is close to 1550 nm and the pump laser wavelength is close to 980 nm, the above condition can be satisfied, that is, the absolute value of the difference between the wavelength value of the signal light and 1550 nm. Below the preset value, the absolute value of the difference between the wavelength value of the pump laser and the 980 nm is less than a preset value. Preferably, the preset value may be 10 nm.

 Referring to FIG. 5, in this embodiment, the erbium-doped fiber on both optical fibers can receive two pump lasers at the same time. When the signal light is transmitted in the forward direction of the fiber, the fiber is input to the erbium-doped fiber after passing through the fiber splitter. The amplified signal light is generated and then transmitted in the optical fiber after passing through the wavelength division multiplexer. The principle of the reverse transmission is the same, and will not be described again. When one of the two pump lasers fails, the other pump laser can still provide about half the power of the pumped laser for the erbium-doped fiber on the two fibers, so that the erbium-doped fiber on the two fibers still has A certain signal light amplification capability achieves the purpose of pump redundancy protection.

 In the embodiment of the present invention, the two pump lasers are mutually redundant by a fiber splitter and a wavelength division multiplexer which are properly arranged in two optical fibers, so that when one pump laser fails, another pump can be passed. The Pu laser supplies pump lasers for two erbium-doped fibers. The two fiber amplifiers still maintain a certain amplification function, which realizes the function of pump redundancy protection and improves the reliability of the fiber amplifier system. Example 2

 Embodiments of the present invention provide a system for pump redundancy protection. Referring to FIG. 9, a first optical fiber 901, a second optical fiber 902, a first pump laser 903, and a second pump laser 904 are included.

 The first optical fiber 901 includes: a first optical fiber splitter 905, a second optical fiber splitter 906, and a first erbium doped optical fiber 909. The second optical fiber 902 includes: a first wavelength division multiplexer 907, a second wavelength division multiplexer 908, and a second erbium doped fiber 910. The first pump laser 903 and the second pump laser 904 are mutually redundant, both providing excitation energy for the first erbium fiber 909 of the first fiber and the second erbium fiber 910 of the second fiber.

 In the present embodiment, the first fiber splitter 905 is connected to the first pump laser 903, the first erbium doped fiber 909, and the second wavelength division multiplexer 908, the first wavelength division multiplexer 907 and the second fiber. The splitter 906 and the second erbium doped fiber 910 are connected; the second fiber splitter 906 is connected to the second pump laser 904, the first erbium doped fiber 909 and the first wavelength division multiplexer 907, and the second wave is divided. The consumer 908 is connected to the first fiber splitter 905 and the second erbium doped fiber 910.

a first fiber splitter 905, configured to receive a first pump laser input by the first pump laser 903, and divide the first pump laser into a first pump laser and a second pump laser, The pump laser is input to the first erbium doped fiber 909, Inputting the second partial pump laser to the second wavelength division multiplexer 908;

 a second fiber splitter 906, configured to receive a second pump laser input by the second pump laser 904, and divide the second pump laser into a third pump laser and a fourth pump laser, and the third The sub-pumped laser is input to the first erbium-doped fiber 909, and the fourth sub-pumped laser is input to the first wavelength division multiplexer 907;

 The first wavelength division multiplexer 907 is configured to receive the fourth sub-pump laser input by the second fiber splitter 906, and input the fourth sub-pump laser to the second erbium doped fiber 910;

 The second wavelength division multiplexer 908 is configured to receive the second partial pump laser input by the first fiber splitter 905, and input the second partial pump laser to the second erbium doped fiber 910.

 In the present embodiment, in the first optical fiber 901, the positions of the first optical fiber splitter 905 and the second optical fiber splitter 906 are located in front of the isolator and the gain flattening filter in the transmission direction to prevent the signal light. The output produces noise light; at the same time, the first fiber splitter 905 and the second fiber splitter 906 are positioned at both ends of the erbium-doped fiber to ensure that the two-way pump lasers are respectively input to both sides of the erbium-doped fiber. In erbium-doped fiber, since the two-way pump laser is input on the same side of the erbium-doped fiber, the coupling of the pump laser is required first.

 In the second optical fiber 902, the setting methods of the specific positions of the first wavelength division multiplexer 907 and the second wavelength division multiplexer 908 are the same, and will not be described again.

 Further, in the embodiment, the optical fiber splitter is a 4-port device, wherein two ports are connected to the optical fiber, and signal light is input from one of the ports and outputted from the other port. When the pump laser is input to the fiber splitter, it is separated into two divided pump lasers and output.

 Therefore, when setting up the optical fiber splitter in the optical fiber, the following conditions should be met as follows: When the optical fiber splitter receives the signal light in the optical fiber, the signal light is not separated, and the signal light is directly outputted in the original optical fiber. When the pump laser is received, the pump laser is separated and output, and when the pump laser is separated, the power of the separated two-channel pump lasers should be equal or close, that is, the pump laser and the original The power ratio of the pump laser is within a preset range, such as in the range of 40% to 60%.

 Specifically, the following measures can be taken: The fiber splitter is realized by a fiber fusion taper technology, and the wavelength of the signal light is selected to be close to 1550 nm, and the wavelength of the pump laser is close to 980 nm.

In the embodiment of the present invention, the two pump lasers are mutually redundant by a fiber splitter and a wavelength division multiplexer which are properly arranged in two optical fibers, so that when one pump laser fails, another pump can be passed. The Pu laser supplies pump lasers for two erbium-doped fibers. The two fiber amplifiers still maintain a certain amplification function, which realizes the function of pump redundancy protection and improves the reliability of the fiber amplifier system. Example 3 An embodiment of the present invention provides a method for pump redundancy protection. The first optical fiber and the second optical fiber using an erbium-doped optical fiber are taken as an example. As shown in FIG. 10, the method includes:

 1001: dividing the first pump laser into a first pump laser and a second pump laser, inputting the first pump laser into the first erbium fiber on the first fiber, and pumping the second pump The laser is input to the second erbium-doped fiber on the second optical fiber after passing through the second wavelength division multiplexer.

 1002: dividing the second pump laser into a third pump laser and a fourth pump laser, inputting the third pump laser into the second erbium fiber, and passing the fourth pump laser through the first wavelength The multiplexer is then input to the first erbium doped fiber.

 1001 and 1002 can be performed simultaneously, either simultaneously or simultaneously.

 Specifically, in this embodiment, the first fiber splitter and the first wavelength division multiplexer are disposed in the first optical fiber, and the second optical fiber splitter and the second wave splitting are disposed in the second optical fiber. Use the device. Connecting the first fiber splitter to the first pump laser, the first erbium doped fiber, and the second wavelength division multiplexer, the first wavelength division multiplexer and the second fiber splitter, An erbium-doped fiber is connected; the second fiber splitter is connected to the second pump laser, the second erbium-doped fiber, and the first wavelength division multiplexer, the second wavelength division multiplexer and the first fiber The splitter and the second erbium doped fiber are connected.

 Receiving, by the first fiber optic splitter, the first pump laser input by the first pump laser, dividing the first pump laser into a first sub-pump laser and a second sub-pump laser, the first sub The pump laser is input to the erbium-doped fiber on the first optical fiber, and the second sub-pumped laser is input to the erbium-doped fiber on the second optical fiber through the second wavelength division multiplexer; The road device receives the second pump laser input by the second pump laser, and divides the second pump laser into a third sub-pump laser and a fourth sub-pump laser, and inputs the third sub-pump laser to The erbium-doped fiber on the second optical fiber is input to the erbium-doped fiber on the first optical fiber through the first wavelength division multiplexer.

 The first fiber splitter and the first wavelength division multiplexer are respectively on both sides of the first erbium-doped fiber; the second fiber splitter and the second wavelength division multiplexer are respectively in the second erbium-doped fiber On both sides.

 In this embodiment, when the optical fiber splitter is disposed in the optical fiber, the following conditions should be met as follows: When the optical fiber splitter receives the signal light in the optical fiber, the signal light is not separated, and the signal light is directly outputted in the original optical fiber. . When the pump laser is received, the pump laser is separated and output, and when the pump laser is separated, the power of the separated two pump lasers should be equal or close, that is, the sub-pump laser and The power ratio of the original pump laser is within a preset range, such as in the range of 40% to 60%.

Specifically, the following measures can be taken: The fiber splitter is realized by a fiber fusion taper technology, and the wavelength of the signal light is selected to be close to 1550 nm, and the wavelength of the pump laser is close to 980 nm. That is, the absolute value of the difference between the wavelength value of the signal light and the 1550 nm is less than the preset value, and the absolute value of the difference between the wavelength value of the pump laser and the 980 nm is less than a preset value. Preferably, the preset value may be 10 nm. In the embodiment of the present invention, the two pump lasers are mutually redundant by a fiber splitter and a wavelength division multiplexer which are properly arranged in two optical fibers, so that when one pump laser fails, another pump can be passed. The Pu laser supplies pump lasers for two erbium-doped fibers. The two fiber amplifiers still maintain a certain amplification function, which realizes the function of pump redundancy protection and improves the reliability of the fiber amplifier system. Example 4

 An embodiment of the present invention provides a method for pump redundancy protection. The first optical fiber and the second optical fiber using an erbium-doped optical fiber are taken as an example. As shown in FIG. 11, the method includes:

 1101: The first fiber splitter receives the first pump laser input by the first pump laser, and divides the first pump laser into a first pump laser and a second pump laser, and the first pump The laser is input to the first erbium-doped fiber on the first optical fiber, and the second sub-pumped laser is input to the second erbium-doped fiber on the second optical fiber through the second wavelength division multiplexer;

 1102: The second fiber splitter receives the second pump laser input by the second pump laser, and divides the second pump laser into a third pump laser and a fourth pump laser, and the third The sub-pumped laser is input to the first erbium-doped fiber, and the fourth sub-pumped laser is input to the second erbium-doped fiber through the first wavelength division multiplexer.

 1101 and 1102 can be performed simultaneously, either simultaneously or simultaneously.

 Specifically, in this embodiment, a first fiber splitter and a second fiber splitter are disposed in the first optical fiber, and the first wavelength division multiplexer and the second wave splitting are disposed in the second optical fiber. Use the device. Connecting the first fiber splitter to the first pump laser, the first erbium doped fiber, and the second wavelength division multiplexer, and the first wavelength division multiplexer and the second fiber multiplexer and the second erbium fiber Connecting the second fiber splitter to the second pump laser, the erbium-doped fiber on the first fiber, and the first wavelength division multiplexer, the second wavelength division multiplexer and the first fiber The splitter and the second erbium doped fiber are connected.

 Receiving, by the first fiber optic splitter, the first pump laser input by the first pump laser, dividing the first pump laser into a first sub-pump laser and a second sub-pump laser, the first sub The pump laser is input to the erbium-doped fiber on the first optical fiber, and the second sub-pumped laser is input to the erbium-doped fiber on the second optical fiber through the second wavelength division multiplexer; The road device receives the second pump laser input by the second pump laser, and divides the second pump laser into a third sub-pump laser and a fourth sub-pump laser, and inputs the third sub-pump laser to The erbium-doped fiber on the first optical fiber is input to the erbium-doped fiber on the second optical fiber through the first wavelength division multiplexer.

 Wherein the first fiber splitter and the second fiber splitter are on both sides of the first erbium-doped fiber; the first wavelength division multiplexer and the second wavelength division multiplexer are in the second erbium-doped fiber side.

In this embodiment, when the optical fiber splitter is disposed in the optical fiber, the following conditions should be met as follows: When the optical fiber splitter receives the signal light in the optical fiber, the signal light is not separated, and the signal light is directly outputted in the original optical fiber. . Receiving pump laser When the pump laser is separated and output, and the pump laser is separated, the power of the separated two pump lasers should be equal or close, that is, the power of the pump laser and the original pump laser. The ratio is within a preset range, such as in the range of 40% to 60%.

 Specifically, the following measures can be taken: The fiber splitter is realized by a fiber fusion taper technology, and the wavelength of the signal light is selected to be close to 1550 nm, and the wavelength of the pump laser is close to 980 nm.

 In the embodiment of the present invention, the two pump lasers are mutually redundant by a fiber splitter and a wavelength division multiplexer which are properly arranged in two optical fibers, so that when one pump laser fails, another pump can be passed. The Pu laser supplies pump lasers for two erbium-doped fibers. The two fiber amplifiers still maintain a certain amplification function, which realizes the function of pump redundancy protection and improves the reliability of the fiber amplifier system. A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program instructing related hardware, and the program can be stored in a computer readable storage medium, where the storage medium is A computer's floppy disk, hard disk, or CD.

 The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim  A system for pump redundancy protection, characterized in that the system comprises:  The first optical fiber 501, the second optical fiber 502, the first pump laser 503, and the second pump laser 504, the first optical fiber 501 includes a first erbium doped fiber 509, a first optical fiber splitter 505, and a first optical fiber 509 a wavelength division multiplexer 506, the second optical fiber package 502 includes a second erbium doped fiber 510, a second fiber splitter 507 and a second wavelength division multiplexer 508;  The first fiber splitter 505 is configured to receive a first pump laser input by the first pump laser 503, and divide the first pump laser into a first pump laser and a second pump a laser, the first pump laser is input to the first erbium fiber 509, the second pump laser is input to the second wavelength division multiplexer 508;  The second fiber splitter 507 is configured to receive a second pump laser input by the second pump laser 504, and divide the second pump laser into a third pump laser and a fourth pump a laser, the third sub-pump laser is input to the second erbium-doped fiber 510, the fourth sub-pump laser is input to the first wavelength division multiplexer 506;  The first wavelength division multiplexer 506 is configured to receive the fourth sub-pump laser input by the second fiber splitter 507, and input the fourth sub-pump laser to the first Erbium doped fiber 509;  The second wavelength division multiplexer 508 is configured to receive the second sub-pump laser input by the first fiber optic splitter 505, and input the second sub-pump laser to the second Erbium doped fiber 510.  2. The pump redundancy protection system according to claim 1, wherein a power ratio of the first partial pump laser to the first pump laser is greater than a preset lower limit value and less than a preset value. An upper limit value; a power ratio of the second partial pump laser to the first pump laser is greater than the preset lower limit value and less than the preset upper limit value;  and / or,  The power ratio of the third pump laser to the second pump laser is greater than the preset lower limit and less than the preset upper limit; the fourth pump laser and the second pump The power ratio of the laser is greater than the preset lower limit and less than the preset upper limit. 3. The system of pump redundancy protection according to claim 1, wherein:  The first fiber splitter 505 is further configured to directly output the first path signal light on the first path fiber 501 when receiving the first path signal light on the first path fiber 501; The second fiber splitter 507 is further configured to directly output the second path signal light on the second path fiber 502 when receiving the second path signal light on the second path fiber 502. 4, according to the pumping and smashing protection system of the uncle, the J £ feature is also The absolute value of the difference between the wavelength value of the pump laser in the first optical fiber 501 and the second optical fiber 502 and the difference of 980 nm is less than a preset value, and the signals in the first optical fiber 501 and the second optical fiber 502 The absolute value of the difference between the wavelength value of the light and 1550 nm is less than the preset value. 5. A method of pump redundancy protection, the method comprising:  Dividing the first pump laser into a first sub-pump laser and a second sub-pump laser, inputting the first sub-pump laser to the first erbium fiber on the first fiber, and the second a sub-pumped laser light is input to a second erbium-doped fiber on the second optical fiber via the second wavelength division multiplexer;  Dividing the second pump laser into a third sub-pump laser and a fourth sub-pump laser, and inputting the third sub-pump laser to the second erbium-doped fiber, and the fourth sub-pump laser Input to the first erbium doped fiber via a first wavelength division multiplexer. The method of claim 2, wherein the power ratio of the first pump laser to the first pump laser is greater than a preset lower limit and less than a preset value. An upper limit value; a power ratio of the second partial pump laser to the first pump laser is greater than the preset lower limit value and less than the preset upper limit value;  and / or,  The power ratio of the third pump laser to the second pump laser is greater than the preset lower limit and less than the preset upper limit; the fourth pump laser and the second pump The power ratio of the laser is greater than the preset lower limit and less than the preset upper limit. 7. The method of pump redundancy protection according to claim 4, wherein the method further comprises: when dividing the first pump laser into the first pump laser and the second pump laser Directly outputting the received signal light on the first optical fiber to the first optical fiber;  When the second pump laser is divided into the third sub-pump laser and the fourth sub-pump laser, the received signal light on the second optical fiber is directly outputted on the second optical fiber. 8. The method of pump redundancy protection according to claim 5, wherein an absolute value of a difference between a wavelength value of the pump laser light in the first optical fiber and the second optical fiber and a 980 nm is smaller than a pre-predetermined value It is assumed that the absolute value of the difference between the wavelength value of the signal light in the first optical fiber and the second optical fiber and the 1550 nm is less than a preset value.