Optical signal amplification device, method, and optical communication system

Abstract

The present disclosure discloses an optical signal amplification apparatus, method, and optical communication system, the optical signal amplification apparatus including a first optical processor, a second optical processor, a third optical processor, a fourth optical processor, and a transmission optical fiber, wherein the fourth optical processor receives second pump light and third pump light and multiplexes the second pump light and the third pump light to form a first mixed pump light, the third optical processor receives the first pump light, the second optical processor receives the first pump light and the first mixed pump light and multiplexes the first pump light and the first mixed pump light to form a second mixed pump light, the first optical processor receives the second mixed pump light and fourth pump light and multiplexes the second mixed pump light and the fourth pump light to form a third mixed pump light, and the transmission optical fiber receives a full-band service optical signal and the third mixed pump light and amplifies an optical signal of at least one wavelength band of the service optical signal based on the third mixed pump light.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from the following patent applications: That is, (1) a patent application was filed with the China Patent Office on March 3, 2023, and priority is claimed based on a Chinese patent application bearing application number 202310204096.2 and the title of the invention being "Optical signal amplification device, method and optical communication system." Technical Field TECHNICAL FIELD Embodiments of the present disclosure relate to optical fiber communication technology, and more particularly to an optical signal amplification device and method, and an optical communication system. [Background technology]

[0002] In the field of optical communications, ultra-broadband optical signal amplifiers have become an essential component for achieving sufficient capacity in communication systems. Erbium-doped fiber amplifiers and Raman fiber amplifiers, in particular, are widely used in optical communication systems. With the ongoing development of optical fiber technology, the use of erbium-doped fiber amplifiers and Raman fiber amplifiers has become increasingly mature, significantly improving the capacity and transmission distance of optical fiber communications. However, research into full-band optical signal amplification for effective transmission in optical communication systems has yet to be conducted. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, an object of the present disclosure is to provide an optical signal amplification device, method, and optical communication system that amplifies the O-band, E-band, S-band, C-band, L-band, and U-band contained in an optical signal, and that can flexibly set and amplify any combination of the O-band, E-band, S-band, C-band, L-band, and U-band. [Means for solving the problem]

[0004] In order to achieve the above object, the invention according to the present disclosure is realized as follows. In a first aspect, an embodiment of the present disclosure provides an optical signal amplification device, the optical signal amplification device comprising a first optical processor, a second optical processor, a third optical processor, a fourth optical processor, and a transmission optical fiber. The fourth optical processor is configured to receive a second pump light (PL) and a third pump light, and to multiplex the second pump light and the third pump light to form a first mixed pump light.

[0005] The third optical processor is configured to receive a first pump light. The second optical processor is connected to the fourth optical processor and the third optical processor, respectively, and is configured to receive the first pump light and the first mixed pump light, and multiplex the first pump light and the first mixed pump light to form a second mixed pump light.

[0006] The first optical processor is connected to the second optical processor and configured to receive the second mixed pump light and the fourth pump light and multiplex the second mixed pump light and the fourth pump light to form a third mixed pump light. The transmission optical fiber is connected to the first optical processor and configured to receive a service optical signal including a full band and the third mixed pump light, and to amplify an optical signal of at least one wavelength band of the service optical signal based on the third mixed pump light.

[0007] In the above solution, the transmission optical fiber is further configured to transmit the amplified service optical signal to the first optical processor. The first optical processor is further configured to receive the amplified service optical signal and to transmit the amplified service optical signal to the second optical processor. The second optical processor is configured to receive the amplified service optical signal, decompose the amplified service optical signal to form a first set of optical signals and a second set of optical signals, transmit the first set of optical signals to the third optical processor, and transmit the second set of optical signals to the fourth optical processor.

[0008] The third optical processor is further configured to receive the first set of optical signals and decompose the first set of optical signals to form first sub-optical signals and second sub-optical signals. The fourth optical processor is further configured to receive the second set of optical signals and decompose the second set of optical signals to form third sub-optical signals and fourth sub-optical signals. The first sub-optical signal, the second sub-optical signal, the third sub-optical signal, and the fourth sub-optical signal include optical signals in at least one wavelength band of the service optical signal.

[0009] In the above solution, the optical signal amplifying device further comprises a first optical fiber circulator, a second optical fiber circulator, and a third optical fiber circulator. The first optical fiber circulator is connected to the third optical processor and configured to receive the first pump light and transmit the first pump light to the third optical processor.

[0010] The second optical fiber circulator is connected to the fourth optical processor and configured to receive the second pump light and transmit the second pump light to the fourth optical processor. The third optical fiber circulator is connected to the fourth optical processor and configured to receive the third pump light and transmit the third pump light to the fourth optical processor.

[0011] In the above solution, the first optical fiber circulator is further configured to receive a second sub-optical signal transmitted by the third optical processor, and output the second sub-optical signal. The second optical fiber circulator is further configured to receive the third sub-optical signal transmitted by the fourth optical processor and to output the third sub-optical signal.

[0012] The third fiber optic circulator is further configured to receive the fourth sub-optical signal transmitted by the fourth optical processor and to output the fourth sub-optical signal. The second sub-optical signal, the third sub-optical signal, and the fourth sub-optical signal each include an optical signal of at least one wavelength band of the service optical signal.

[0013] In the above solution, the optical signal amplifying device further comprises a first pump generator, a second pump generator, a third pump generator and a fourth pump generator. The first pump generator is configured to generate the first pump light. The second pump generator is configured to generate the second pump light. The third pump generator is configured to generate the third pump light. The fourth pump generator is configured to generate the fourth pump light.

[0014] In the above solution, the first optical processor, the second optical processor, the third optical processor and the fourth optical processor are wavelength division multiplexers for demultiplexing or multiplexing. In the above solution, the first sub-optical signal includes a U-band optical signal of the service optical signal, the second sub-optical signal includes a C-band optical signal and an L-band optical signal of the service optical signal, the third sub-optical signal includes an S-band optical signal of the service optical signal, and the fourth sub-optical signal includes an O-band optical signal and an E-band optical signal of the service optical signal.

[0015] In the above solution, the wavelength range of the first pump light includes 1500 nm to 1560 nm, the wavelength range of the second pump light includes 1425 nm to 1500 nm, the wavelength range of the third pump light includes 1370 nm to 1433 nm, and the wavelength range of the fourth pump light includes 1200 nm to 1370 nm. In the second aspect, an embodiment of the present disclosure provides an optical communication system that supports processing of a full-band service optical signal, and in which the service optical signal is amplified by any of the optical signal amplifiers described above.

[0016] In a third aspect, an embodiment of the present disclosure provides a method for amplifying an optical signal, the method comprising the steps of: receiving a first pump light, a second pump light, a third pump light, and a fourth pump light; multiplexing the second pump light and the third pump light to form a first mixed pump light; multiplexing the first pump light and the first mixed pump light to form a second mixed pump light; multiplexing the second mixed pump light and the fourth pump light to form a third mixed pump light; and amplifying an optical signal of at least one wavelength band of the service optical signal based on the third mixed pump light.

[0017] Embodiments of the present disclosure provide an apparatus and method for amplifying an optical signal, and an optical communication system, wherein the optical signal amplifying apparatus includes a first optical processor, a second optical processor, a third optical processor, a fourth optical processor, and a transmission optical fiber, wherein the fourth optical processor is configured to receive the first pump light, and the third optical processor is configured to receive the second pump light and the third pump light and multiplex the second pump light and the third pump light to form a first mixed pump light.

[0018] The second optical processor is connected to the fourth optical processor and the third optical processor, respectively, and is configured to receive first pump light and first mixed pump light and multiplex the first pump light and the first mixed pump light to form second mixed pump light, and the first optical processor is connected to the second optical processor and is configured to receive the second mixed pump light and fourth pump light and multiplex the second mixed pump light and the fourth pump light to form third mixed pump light.

[0019] The transmission optical fiber is connected to the first optical processor and configured to receive a full-band service optical signal and the third mixed pump light, and amplify an optical signal of at least one wavelength band of the service optical signal based on the third mixed pump light.

[0020] The optical signal amplification device of the present disclosure multiplexes four types of pump light using four optical processors to form mixed pump light containing multiple wavelengths, and uses this mixed pump light to amplify any multiple wavelength bands within the full band of the signal contained in the service optical signal, thereby enabling the full band optical signal to be transmitted effectively in an optical fiber communication system. [Brief explanation of the drawings]

[0021] In the drawings, which are not necessarily made to scale, the same numbers may describe similar components in different drawings. The same numbers with different alphabetical suffixes may describe different embodiments of similar components. The accompanying drawings are intended to be illustrative, and not limiting, and generally illustrate various embodiments described herein.

[0022] [Figure 1] 1 is a schematic diagram illustrating a configuration of an optical signal amplifying device provided according to an embodiment of the present disclosure. [Figure 2] 1 is a schematic diagram illustrating a configuration of an optical signal amplifier provided by an embodiment of the present disclosure. [Figure 3]1 is a schematic diagram of a hardware configuration of an optical signal amplifier provided according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic flow diagram of a method for amplifying an optical signal provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0023] In order to make the objectives, features and advantages of the present disclosure clearer and easier to understand, the solutions in the embodiments of the present disclosure will now be clearly and completely described with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, and are not all of the embodiments. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present disclosure without any creative effort fall within the scope of protection of the present disclosure.

[0024] In the early 1990s, the successful development of erbium-doped fiber amplifiers and the maturation of wavelength division multiplexing technology significantly improved the capacity and transmission distance of optical fiber communications. However, in recent years, explosive growth in networks has led to a doubling of data traffic, necessitating the need for even greater capacity in optical fiber communication systems. Traditional approaches to expanding the capacity of optical fiber communication systems have been to increase the transmission speed of a single channel or to increase the number of channels by reducing the channel spacing. However, this approach also increases the impact of dispersion and nonlinear effects on the system. Therefore, an effective means of increasing transmission capacity is to expand the system's transmission bandwidth, which in turn requires higher performance optical fiber amplifiers.

[0025] Conventional C-band or L-band optical fiber amplifiers are mainly erbium-doped optical fiber amplifiers. Stimulated emission of erbium-doped optical fiber is used to amplify C-band or L-band optical signals. The advantages of this approach are that the optical path structure of the optical fiber amplifier is simple and high signal output power and gain can be achieved with a small pump power. The disadvantage is that the gain window of erbium ions is narrow and can only support standard erbium windows. The spontaneous emission of erbium ions generates noise, which increases the noise factor (NF) of the optical fiber amplifier and affects the optical signal-to-noise ratio (SNR) of the communication system.

[0026] The spectrum of Raman fiber amplifiers based on the Raman scattering effect is very wide. When two light waves with the same frequency interval as the Stokes frequency are simultaneously input into an optical fiber, the low-frequency wave will gain optical gain, while the high-frequency wave will be attenuated and its energy will be transferred to the low-frequency band. When a low-energy optical signal is simultaneously transmitted through an optical fiber with a high-energy pump light, and the frequency difference is within the Raman gain spectrum of the optical fiber, the low-energy optical signal can be amplified.

[0027] Theoretically, by selecting an appropriate Raman pump wavelength, it is possible to amplify optical signals in the full band (1260nm to 1670nm). Distributed Raman amplifiers, which utilize the Raman scattering effect in optical fibers, have the characteristic of achieving full-band optical signal amplification. With the continuous development of optical fiber technology, non-zero dispersion displacement optical fibers, which have already been commercialized on a large scale, have extremely low optical fiber loss across the full band. As a result, O-band, E-band, S-band, and U-band, which were previously not considered communication channels, have become potential communication resources. As a result, optical fiber amplifiers used to amplify O-band, E-band, S-band, and U-band have become a hot topic of experimental research.

[0028] In recent years, with the advent of specially doped optical fibers and pump lasers with special wavelengths, optical fiber amplifiers based on the Raman scattering principle have become capable of amplifying the O-, E-, S-, and U-bands. However, the current issue is how to enable optical fiber amplifiers for each wavelength band to amplify the optical signals of each wavelength band contained in the service optical signal, thereby enabling the full-band optical signal to be transmitted effectively in an optical fiber communication system.

[0029] The technical solution of the embodiment of the present invention is to multiplex four types of pump light using four optical processors to form a mixed pump light containing multiple wavelengths, and use this mixed pump light to amplify optical signals of any multiple wavelength bands included in a full-band service optical signal, so that the full-band optical signal can be effectively transmitted in an optical fiber communication system.

[0030] The configuration of the optical signal amplifier will be described in detail below with reference to the drawings. 1 is a schematic diagram of an optical signal amplifier provided according to an embodiment of the present disclosure. As shown in FIG. 1, an optical signal amplifier 10 according to the embodiment of the present disclosure includes a first optical processor 101, a second optical processor 102, a third optical processor 103, a fourth optical processor 104, and a transmission optical fiber 105.

[0031] The fourth optical processor 104 is configured to receive a second pump light and a third pump light, and multiplex the second pump light and the third pump light to form a first mixed pump light. The third optical processor 103 is configured to receive a first pump light.

[0032] The second optical processor 102 is connected to the fourth optical processor and the third optical processor, respectively, and is configured to receive the first pump light and the first mixed pump light, and multiplex the first pump light and the first mixed pump light to form a second mixed pump light.

[0033] The first optical processor 101 is connected to the second optical processor and configured to receive the second mixed pump light and the fourth pump light, and multiplex the second mixed pump light and the fourth pump light to form a third mixed pump light. The transmission optical fiber 105 is connected to the first optical processor and configured to receive a full-band service optical signal and the third mixed pump light, and amplify an optical signal in at least one wavelength band of the service optical signal based on the third mixed pump light.

[0034] Here, the first optical processor 101, the second optical processor 102, the third optical processor 103, and the fourth optical processor 104 may be wavelength division multiplexers (WDM) that can multiplex or demultiplex for users. The transmission optical fiber may be an erbium-doped optical fiber. Its function is not only to transmit optical signals but also to serve as a gain medium for a Raman optical fiber amplifier. In practical applications, the length of the transmission optical fiber may be 50 kilometers (km) or more.

[0035] The optical signal amplifying device according to the present disclosure multiplexes the first pump light, the second pump light, the third pump light, and the fourth pump light by the fourth optical processor, the third optical processor, the second optical processor, and the first optical processor to form a third mixed pump light, which is configured to amplify an optical signal of at least one wavelength band included in a full-band service optical signal obtained during a transmission process in a transmission optical fiber 105.

[0036] It should be noted that in the course of actual application, one or more optical signals in the first pump light, the second pump light, the third pump light, and the fourth pump light may be 0. Therefore, the optical signal amplifier according to the present disclosure can amplify all of the O band, E band, S band, C band, L band, and U band included in the service optical signal, and can also flexibly set and amplify multiple wavelength bands of the O band, E band, S band, C band, L band, and U band in any combination.

[0037] In the above description, the multiplexing functions of the fourth optical processor, the third optical processor, the second optical processor, and the first optical processor are used. In some embodiments, the transmission optical fiber 105 is further configured to transmit the amplified service optical signal to the first optical processor 101 . The first optical processor 101 is further configured to receive an amplified service optical signal and to transmit the amplified service optical signal to the second optical processor 102 .

[0038] The second optical processor 102 receives the amplified service optical signal, decomposes the amplified service optical signal into a first set of optical signals and a second set of optical signals, transmits the first set of optical signals to the third optical processor 103, and transmits the second set of optical signals to the fourth optical processor 104. The third optical processor 103 is further configured to receive the first set of optical signals and decompose the first set of optical signals to form first sub-optical signals and second sub-optical signals.

[0039] The fourth optical processor 104 is further configured to receive the second set of optical signals and decompose the second set of optical signals to form third sub-optical signals and fourth sub-optical signals. The first sub-optical signal, the second sub-optical signal, the third sub-optical signal, and the fourth sub-optical signal include optical signals in at least one wavelength band of the service optical signal.

[0040] In practical application, the fourth optical processor, the third optical processor, the second optical processor, and the first optical processor may further have a demultiplexing function, i.e., decompose a multi-band mixed optical signal into a single-band optical signal. Specifically, the first optical processor is configured to receive an amplified service optical signal transmitted by the transmission optical fiber 105 and transmit the amplified service optical signal to the second optical processor 102, which is configured to receive the amplified service optical signal and decompose the amplified service optical signal to form a first set of optical signals and a second set of optical signals.

[0041] The first set of optical signals includes multiple wavelength bands of the amplified service optical signal, and the second set of optical signals includes multiple wavelength bands of the amplified service optical signal. The second optical processor 102 further transmits the first set of optical signals to the third optical processor 103 and transmits the second set of optical signals to the fourth optical processor 104. The third optical processor 103 receives the first set of optical signals and demultiplexes the first set of optical signals to form first sub-optical signals and second sub-optical signals.

[0042] The fourth optical processor 104 receives the second set of optical signals and demultiplexes the second set of optical signals to form third sub-optical signals and fourth sub-optical signals, where the first sub-optical signals, the second sub-optical signals, the third sub-optical signals, and the fourth sub-optical signals include optical signals of at least one wavelength band of a service optical signal.

[0043] In an optional embodiment, the first sub-optical signal includes an optical signal in the U-band of the service optical signal, the second sub-optical signal includes optical signals in the C-band and L-band of the service optical signal, the third sub-optical signal includes an optical signal in the S-band of the service optical signal, and the fourth sub-optical signal includes optical signals in the O-band and E-band of the service optical signal.

[0044] Correspondingly, the wavelength range of the first pump light may include 1500 nm to 1560 nm, the wavelength range of the second pump light may include 1425 nm to 1500 nm, the wavelength range of the third pump light may include 1370 nm to 1433 nm, and the wavelength range of the fourth pump light may include 1200 nm to 1370 nm.

[0045] The pump light required to amplify the optical signals of each wavelength band in the service optical signal may be different. For example, the U-band optical signal included in the service optical signal needs to be amplified with pump light having a wavelength of 1500 nm to 1560 nm. The C-band and L-band optical signals included in the service optical signal need to be amplified with pump light having a wavelength of 1425 nm to 1500 nm. The S-band optical signal included in the service optical signal needs to be amplified with pump light having a wavelength of 1370 nm to 1433 nm. The O-band and E-band optical signals included in the service optical signal need to be amplified with pump light having a wavelength of 1200 nm to 1370 nm.

[0046] In practical application, the first pump light may be a set of pump light including one to three wavelengths in the range of 1500 nm to 1560 nm. In other words, the first pump light may be a set of pump light covering one wavelength in the range of 1500 nm to 1560 nm, or covering two or three wavelengths in the range of 1500 nm to 1560 nm. The reason why the first pump light covers pump light of multiple wavelengths is to amplify all wavelengths in the U-band included in the service optical signal, rather than amplifying only a portion of the U-band.

[0047] Similarly, the second pump light may be a pump light set including one to three wavelengths between 1425 nm and 1500 nm, the third pump light may be a pump light set including one to three wavelengths between 1370 nm and 1433 nm, and the fourth pump light may be a pump light set including two to three wavelengths between 1200 nm and 1370 nm.

[0048] In some embodiments, as shown in FIG. 2, the amplification device 10 may further include a first optical fiber circulator 106, a second optical fiber circulator 107, and a third optical fiber circulator . The first optical fiber circulator 106 is connected to the third optical processor and configured to receive the first pump light and transmit the first pump light to the third optical processor.

[0049] The second optical fiber circulator 107 is connected to the fourth optical processor and configured to receive the second pump light and transmit the second pump light to the fourth optical processor. The third optical fiber circulator 108 is connected to the fourth optical processor and configured to receive the third pump light and transmit the third pump light to the fourth optical processor.

[0050] In some embodiments, the first optical fiber circulator 106 is further configured to receive a second optical sub-signal transmitted by the third optical processor and to output the second optical sub-signal. The second optical fiber circulator 107 is further configured to receive a third optical sub-signal transmitted by the fourth optical processor and to output the third optical sub-signal.

[0051] The third fiber optic circulator 108 is further configured to receive a fourth optical sub-signal transmitted by the fourth optical processor and to output the fourth optical sub-signal. The second optical sub-signal, the third optical sub-signal, and the fourth optical sub-signal include optical signals in at least one wavelength band of a service optical signal.

[0052] The purpose of using an optical fiber circulator is to transmit an optical signal of a specific wavelength band in the amplified service optical signal separately from a pump light having a different transmission direction in the same optical communication system. For example, the first optical fiber circulator 106 transmits the first pump light to the third optical processor and transmits the amplified second sub-optical signal to the outside. Since the other optical fiber circulators have similar functions, further explanation will be omitted here.

[0053] In some embodiments, as shown in FIG. 2, the amplification device 10 further comprises a first pump generator 109, a second pump generator 110, a third pump generator 111, and a fourth pump generator 112. The first pump generator is configured to generate the first pump light. The second pump generator is configured to generate the second pump light. The third pump generator is configured to generate the third pump light. The fourth pump generator is configured to generate the fourth pump light.

[0054] It should be noted that the first pump generator, the second pump generator, the third pump generator and the fourth pump generator may be light-emitting diodes or other elements or devices, but these will not be described in detail here.

[0055] To facilitate understanding of the present disclosure, Fig. 3 shows a schematic diagram of the hardware configuration of an optical signal amplifier according to an embodiment of the present disclosure. Note that in Fig. 3, the transmission optical fiber is the transmission optical fiber. WDM1, WDM2, WDM3, and WDM4 are hardware for realizing the first optical processor, second optical processor, third optical processor, and fourth optical processor, and have the functions of multiplexing and demultiplexing optical wavelengths.

[0056] Optical fiber circulator 1, optical fiber circulator 2, and optical fiber circulator 3 are hardware for realizing the first, second, and third optical fiber circulators, respectively, and all three have the same structure. Each optical fiber circulator has three ports, port 1, port 2, and port 3, and their specific uses will be described later. Raman pump light 1, Raman pump light 2, Raman pump light 3, and Raman pump light 4 are the first, second, third, and fourth pump lights, respectively.

[0057] The diodes included in Raman pump set 1, Raman pump set 2, Raman pump set 3, and Raman pump set 4 are hardware for realizing the first pump generator, the second pump generator, the third pump generator, and the fourth pump generator. Raman pump light 1 and 2 are the first mixed pump light, Raman pump light 1, 2, and 3 are the second mixed pump light, and Raman pump light 1, 2, 3, and 4 are the third mixed pump light.

[0058] The amplified U-band optical signal may be the first sub-optical signal, the amplified C-band and L-band optical signals may be the second sub-optical signal, the amplified S-band optical signal may be the third sub-optical signal, and the amplified O-band and E-band optical signals may be the fourth sub-optical signal.

[0059] The Raman pump set 1 refers to the first box enclosed by a dashed line counting down from the upper right corner, and includes a first pump generator (light-emitting diode) and an optical fiber that outputs an amplified U-band optical signal. The U-band amplifier referred to in FIG. 3 may include any device that can amplify the U-band portion of the service optical signal. Specifically, it includes a U-band amplifier that amplifies the U-band portion of the service optical signal, which is composed of a transmission optical fiber 105, a diode, and a connected intermediate optical fiber.

[0060] Similarly, the structures and principles of the Raman pump set 2, Raman pump set 3, Raman pump set 4, C-band and L-band optical fiber amplifiers, S-band optical fiber amplifiers, and O-band and E-band optical fiber amplifiers will not be described in detail.

[0061] In Figure 3, the dashed arrows from left to right indicate the transmission direction of the service optical signal carrying the right service, and the dashed arrows from right to left indicate the transmission direction of each set of Raman pump light. The transmission optical fiber connecting the wavelength division multiplexer WDM1 not only transmits the optical signal but also serves as the gain medium for the Raman optical fiber amplifier. To obtain effective Raman gain, the length of the transmission optical fiber must be 50 km or longer. The connection method for the components of the optical signal amplifier shown in Figure 3 is as follows: Raman pump light 1 and the transmission optical fiber form a U-band Raman optical fiber amplifier, which amplifies the U-band optical signal passing through the transmission optical fiber. The Raman pump light 1 passes through port 1 of the optical fiber circulator 1 and is output from port 2.

[0062] The Raman pump light 2 and the transmission optical fiber constitute a C-band and L-band Raman optical fiber amplifier, which amplifies the C-band and L-band optical signals passing through the transmission optical fiber. The pump light of Raman pump light 2 passes through port 1 of optical fiber circulator 2 and is output from port 2. Similarly, the Raman pump light 3 and the transmission optical fiber constitute an S-band Raman optical fiber amplifier, which amplifies the S-band optical signal passing through the transmission optical fiber. The pump light of Raman pump light 3 passes through port 1 of optical fiber circulator 3 and is output from port 2.

[0063] The specific logic is as follows: Raman pump light 1-3 that has passed through each optical fiber circulator is multiplexed by wavelength division multiplexer WDM1 with wavelength division multiplexers WDM2, WDM3, WDM4, and Raman pump light 4, and enters the transmission optical fiber of the gain medium, amplifying the transmitted full-band optical signal. That is, as described above, Raman pump light 2 and Raman pump light 2 are multiplexed by WDM4 to form Raman pump light 2 and 3. Next, Raman pump light 1 and Raman pump light 2 and 3 transmitted by WDM3 are multiplexed by WDM2 to form Raman pump light 1, 2, and 3.

[0064] Then, the Raman pump lights 1, 2, 3 and 4 are multiplexed by WDM 1 to form Raman pump lights 1, 2, 3, 4. Then, the Raman pump lights 1, 2, 3, 4 enter the transmission optical fiber and amplify each wavelength band contained in the service optical signal in the transmission optical fiber.

[0065] The amplified full-band optical signal is then split into two parts by wavelength by wavelength division multiplexer WDM2. One part is the 1530 nm to 1675 nm optical signal (i.e., the first optical signal set), and the other part is the 1260 nm to 1525 nm optical signal (i.e., the second optical signal set). The 1530 to 1675 nm optical signal, including the C-band, L-band, and U-band optical signals, enters wavelength division multiplexer WDM3. After demultiplexing and amplification by WDM3, the C-band and L-band optical signals (second sub-optical signals) enter port 2 of optical fiber circulator 1 and are output from port 3. The amplified U-band optical signal (first sub-optical signal) can be directly output for further transmission.

[0066] The optical signals in the O, E, and S bands of 1260 nm to 1525 nm are further decomposed into two parts by a wavelength division multiplexer WDM 4. The long-wavelength optical signal of 1460 to 1530 nm (which may be the third sub-optical signal) passes through port 2 of optical fiber circulator 2 and is output from port 3 of optical fiber circulator 2. The short-wavelength optical signal of 1260 to 1460 nm (the fourth sub-optical signal) passes through port 2 of optical fiber circulator 3 and is output from port 3 of optical fiber circulator 3.

[0067] An optical signal amplification device according to an embodiment of the present disclosure utilizes the principle of Raman scattering and the nonreciprocity of unidirectional transmission in an optical fiber circulator to flexibly multiplex each separate wavelength band using a Raman optical fiber amplifier as needed. Specifically, to address gaps in the prior art, the present disclosure provides a device capable of multiplexing optical signals amplified by Raman optical fiber amplifiers for each of the O-band, E-band, S-band, C-band, L-band, and U-band. This multiplexing device can flexibly set multiple wavelength bands, including the O-band, E-band, S-band, C-band, L-band, and U-band, in any combination as needed, and multiplex amplified optical signals for any combination of these bands.

[0068] One embodiment of the present disclosure provides an optical communication system that supports processing of a full-band service optical signal, in which the service optical signal is amplified using any of the optical signal amplifiers described above.

[0069] An embodiment of the present disclosure further provides a method for amplifying an optical signal, as shown in Figure 4. As shown in Figure 4, the method includes the following steps: S401: Receive the first pump light, the second pump light, the third pump light, and the fourth pump light. S402: Multiplex the second pump light and the third pump light to form a first mixed pump light. S403: Multiplex the first pump light and the first mixed pump light to form a second mixed pump light. S404: Multiplex the second mixed pump light and the fourth pump light to form a third mixed pump light. S405: Amplify an optical signal of at least one wavelength band of the service optical signal based on the third mixed pump light.

[0070] The optical signal amplification method according to the embodiment of the present disclosure is based on the optical signal amplification device. The meanings and reference relationships of the terms used in this specification also apply here, and no further detailed explanations will be given.

[0071] The embodiments of the present disclosure also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, controls the execution of each step of the method embodiment. The computer-readable storage medium includes various media capable of storing program code, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, optical disks, etc.

[0072] It should be understood that the references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with that embodiment is included in at least one embodiment of the present disclosure. Therefore, the appearances of "one embodiment" or "an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that in various embodiments of the present disclosure, the magnitude of the serial numbers of the above processes does not imply an execution order. The execution order of each process should be determined by its function and internal logic and does not impose any limitations on the implementation process of the embodiments of the present disclosure. The serial numbers of the above embodiments of the present disclosure are for illustrative purposes only and do not indicate the superiority or inferiority of the embodiments.

[0073] It should be noted that, as used herein, the terms "comprise," "include," or other terms are intended to include a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a set of elements includes not only those elements but also other elements not expressly listed or that are inherent in such process, method, article, or apparatus. Unless further limited, an element defined by the phrase "comprises" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0074] In some embodiments provided in the present disclosure, it should be understood that the disclosed devices and methods can be realized in other ways. The above-described device embodiments are schematic, and for example, the division of units is merely a logical functional division, and other divisions may be used in actual implementation. For example, multiple units or modules may be combined or integrated into another system, or some configurations may be omitted or not implemented. Furthermore, couplings, direct couplings, or communication connections between illustrated or described components may be made via some interface, and indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0075] The units described above as individual components may or may not be physically separated. The components shown as units may or may not be physical units. They may be located in one place or may be distributed across multiple network units. Depending on actual needs, some or all of the units may be selected to achieve the purpose of this embodiment.

[0076] Furthermore, the functional units in each embodiment of the present disclosure may all be integrated into a single processing unit, or each unit may be configured as an independent unit. Two or more units may be integrated into a single unit. These integrated units may be implemented in hardware or as a combination of hardware and software functional units.

[0077] The above description is merely an embodiment of the present disclosure, and the scope of protection of the present disclosure is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims. [Explanation of symbols]

[0078] 10 Optical signal amplifier 101 First Optical Processor 102 Second Optical Processor 103 Third Optical Processor 104 Fourth Optical Processor 105 Transmission Optical Fiber 106 First optical fiber circulator 107 Second optical fiber circulator 108 Third Optical Fiber Circulator 109 No. 1 Pump Generator 110 Second Pump Generator 111 Third Pump Generator 112 No. 4 Pump Generator

Claims

1. An optical signal amplifying device including a first optical processor, a second optical processor, a third optical processor, a fourth optical processor, and a transmission optical fiber, the fourth optical processor is configured to receive second pump light and third pump light and multiplex the second pump light and the third pump light to form a first mixed pump light; the third optical processor is configured to receive a first pump light; the second optical processor is connected to the fourth optical processor and the third optical processor, respectively, and is configured to receive the first pump light and the first mixed pump light, and multiplex the first pump light and the first mixed pump light to form a second mixed pump light; the first optical processor is coupled to the second optical processor and configured to receive the second mixed pump light and the fourth pump light and multiplex the second mixed pump light and the fourth pump light to form a third mixed pump light; an optical signal amplifying device, wherein the transmission optical fiber is connected to the first optical processor, and is configured to receive a service optical signal including a full band and the third mixed pump light, and to amplify an optical signal of at least one wavelength band of the service optical signal based on the third mixed pump light.

2. the transmission optical fiber is further configured to transmit an amplified service optical signal to the first optical processor; the first optical processor is further configured to receive the amplified service optical signal and transmit the amplified service optical signal to the second optical processor; the second optical processor is configured to receive the amplified service optical signal, decompose the amplified service optical signal to form a first set of optical signals and a second set of optical signals, transmit the first set of optical signals to the third optical processor, and transmit the second set of optical signals to the fourth optical processor; the third optical processor is configured to receive the first set of optical signals and decompose the first set of optical signals to form first sub-optical signals and second sub-optical signals; the fourth optical processor is further configured to receive the second set of optical signals and decompose the second set of optical signals to form third sub-optical signals and fourth sub-optical signals; 2. The optical signal amplifying device according to claim 1, wherein the first sub-optical signal, the second sub-optical signal, the third sub-optical signal, and the fourth sub-optical signal include an optical signal in at least one wavelength band of the service optical signal.

3. the optical signal amplifying device further comprises a first optical fiber circulator, a second optical fiber circulator, and a third optical fiber circulator; the first optical fiber circulator is connected to the third optical processor and configured to receive the first pump light and transmit the first pump light to the third optical processor; the second optical fiber circulator is connected to the fourth optical processor and configured to receive the second pump light and transmit the second pump light to the fourth optical processor; 2. The optical signal amplifying device of claim 1, wherein the third optical fiber circulator is connected to the fourth optical processor and configured to receive the third pump light and transmit the third pump light to the fourth optical processor.

4. the first optical fiber circulator is further configured to receive a second sub-optical signal transmitted by the third optical processor and to output the second sub-optical signal; the second optical fiber circulator is further configured to receive a third sub-optical signal transmitted by the fourth optical processor and to output the third sub-optical signal; the third optical fiber circulator is further configured to receive a fourth sub-optical signal transmitted by the fourth optical processor and to output the fourth sub-optical signal; 4. The optical signal amplifying device according to claim 3, wherein the second sub-optical signal, the third sub-optical signal, and the fourth sub-optical signal include an optical signal in at least one wavelength band of the service optical signal.

5. the optical signal amplifying device further comprises a first pump generator, a second pump generator, a third pump generator, and a fourth pump generator; the first pump generator is configured to generate the first pump light; the second pump generator is configured to generate the second pump light; the third pump generator is configured to generate the third pump light; the fourth pump generator is configured to generate the fourth pump light; 2. The optical signal amplifier according to claim 1.

6. 2. The optical signal amplifying device according to claim 1, wherein the first optical processor, the second optical processor, the third optical processor, and the fourth optical processor are wavelength division multiplexing devices for multiplexing or demultiplexing.

7. 3. The optical signal amplifying device of claim 2, wherein the first sub-optical signal includes a U-band optical signal of the service optical signal, the second sub-optical signal includes a C-band optical signal and an L-band optical signal of the service optical signal, the third sub-optical signal includes an S-band optical signal of the service optical signal, and the fourth sub-optical signal includes an O-band optical signal and an E-band optical signal of the service optical signal.

8. 8. The optical signal amplifying device according to claim 7, wherein the wavelength range of the first pump light includes 1500 nm to 1560 nm, the wavelength range of the second pump light includes 1425 nm to 1500 nm, the wavelength range of the third pump light includes 1370 nm to 1433 nm, and the wavelength range of the fourth pump light includes 1200 nm to 1370 nm.

9. An optical signal amplifying device according to any one of claims 1 to 7, wherein one or more of the first pump light, the second pump light, the third pump light and the fourth pump light can be 0.

10. The optical signal amplifier according to any one of claims 1 to 7, wherein the optical signal amplifier amplifies all of the O band, E band, S band, C band, L band, and U band included in the service optical signal, or amplifies a combination of two or more of the O band, E band, S band, C band, L band, and U band.

11. An optical communication system, wherein the optical communication system supports processing of a full-band service optical signal, and wherein the service optical signal is amplified using an optical signal amplifier according to any one of claims 1 to 8.

12. 1. A method for amplifying an optical signal, comprising: The method comprises: receiving first pump light, second pump light, third pump light, and fourth pump light; multiplexing the second pump light and the third pump light to form a first mixed pump light; multiplexing the first pump light and the first mixed pump light to form a second mixed pump light; multiplexing the second mixed pump light and the fourth pump light to form a third mixed pump light; and amplifying an optical signal of at least one wavelength band of a service optical signal based on the third mixed pump light.

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