An amplifier and system

Abstract

The embodiment of the present application provides a kind of optical fiber amplifier, the optical fiber amplifier includes: at least one combiner, at least one amplification module, at least one auxiliary light source, the amplification module receives input signal light, and utilizes pump light to amplify the input signal light, obtains output signal light, and the input signal light is L waveband signal light;The auxiliary light source is used to generate auxiliary light, the wavelength of the auxiliary light is C waveband, the optical power of the auxiliary light is less than the optical power of the input signal light, and the optical power of the auxiliary light is less than the optical power of the pump light;The combiner is used to couple the auxiliary light into the amplification module.Based on the scheme of the present application, by utilizing the auxiliary light of C waveband introduced in the optical fiber amplifier, the accumulation of C waveband ASE is inhibited, so as to reduce the consumption of C waveband ASE to pump power, and the pump efficiency of L waveband signal light amplification is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of optical communication, and more particularly, to an amplifier and a system. BACKGROUND

[0002] With the development of communication technology, the rapid rise of new services and applications such as 5th generation mobile communication technology (5G), augmented reality (AR), virtual reality (VR), cloud computing, high-definition video, and the Internet of Things has led to a high demand for network traffic. Currently, two commonly used solutions to increase network transmission capacity are to increase the number of fiber deployments and to increase the transmission capacity of a single fiber. Among them, the spectrum bandwidth expansion based on wavelength division technology has the advantages of convenient and flexible implementation, high economic benefits, etc., and has become the preferred expansion solution.

[0003] As an important component of an optical communication system, an optical amplifier is one of the most difficult optical devices in the spectrum bandwidth expansion technology. The conventional band (C) ranges from 1530nm to 1565nm, which is located in the interval of high emission coefficient in the erbium-doped fiber (EDF) emission spectrum, and it is easy to achieve high particle inversion, thereby obtaining a large gain and low noise erbium-doped fiber amplifier (EDFA) that meets the communication requirements. However, as the C-band spectrum resources are exhausted, therefore, using the long-wavelength band (L) (generally 1565nm-1625nm) to realize optical communication is the current research hotspot.

[0004] Compared with the C-band, the L-band is located at the edge of the EDF emission spectrum, and the emission coefficient is low, and the conversion efficiency of optical amplification is low, therefore, using the EDF to realize L-band optical amplification requires high pump power, which increases the overall power consumption of the erbium-doped fiber amplifier (EDFA), and also makes the cost of the wavelength division multiplexing (WDM) system high.

[0005] Therefore, how to improve the pump efficiency of the L-band optical amplifier is a problem to be solved. SUMMARY

[0006] The present application provides an optical fiber amplifier for the field of optical fiber communication, which can improve the L-band optical pump efficiency and realize dynamic gain adjustment of L-band optical amplification.

[0007] In a first aspect, an embodiment of the present application provides an optical fiber amplifier, comprising: at least one combiner, at least one amplification module, at least one auxiliary light source, the amplification module receives input signal light and amplifies the input signal light by pump light to obtain output signal light, the input signal light is L-band signal light; the auxiliary light source is configured to generate auxiliary light, the wavelength of the auxiliary light is C-band, the optical power of the auxiliary light is less than the optical power of the input signal light, and the optical power of the auxiliary light is less than the optical power of the pump light; and the combiner is configured to couple the auxiliary light into the amplification module.

[0008] Based on the above scheme, the present application introduces C-band auxiliary light in the optical fiber amplifier to suppress the accumulation of C-band ASE, thereby reducing the consumption of C-band ASE on pump power and improving the pump efficiency of L-band signal light amplification.

[0009] In combination with the first aspect, in some implementations of the first aspect, the amplifier further comprises: a splitter and an optical detector, the splitter is configured to separate to-be-measured light in the output signal light, the wavelength of the to-be-measured light is C-band; the optical detector is configured to measure the optical power of the to-be-measured light, and the auxiliary light source is configured to adjust the wavelength of the auxiliary light and / or the optical power of the auxiliary light based on the optical power of the to-be-measured light.

[0010] Based on the above scheme, the present application introduces C / L splitter at the output end of the L-band optical amplifier to filter out C-band light for power detection, and through feedback adjustment of the power and wavelength of the C-band seed light, dynamic gain adjustment of the L-band optical amplifier can be realized, the loss of the L-band signal light is reduced, and the performance of the L-band optical amplifier is improved.

[0011] In combination with the first aspect, in some implementations of the first aspect, the amplifier further comprises: a filter configured to filter out C-band spontaneous emission noise in the to-be-measured light.

[0012] In combination with the first aspect, in some implementations of the first aspect, the amplification module comprises: a wavelength division multiplexer, a pump light source, and a gain optical fiber, the wavelength division multiplexer is configured to couple the pump light into the gain optical fiber; the pump light source is configured to generate the pump light; and the gain optical fiber is configured to amplify the input signal light by the pump light, and the gain optical fiber is an erbium-doped optical fiber.

[0013] In combination with the first aspect, in some implementations of the first aspect, the wavelength of the pump light is less than the wavelength of the C-band signal light, and the wavelength of the first pump light is 980 nm or 1480 nm.

[0014] Based on the above scheme, the amplifier provided in the application can reduce the cost of the device when amplifying L-band signal light by using common pump light, compared with C-band pump.

[0015] With reference to the first aspect, in some implementations of the first aspect, the combiner is arranged at an input end of the amplification module, and the combiner is further configured to couple the input signal light and the auxiliary light to generate first coupled signal light, and the combiner, configured to couple the auxiliary light into the amplification module, includes the combiner, configured to couple the first coupled signal light into the amplification module.

[0016] With reference to the first aspect, in some implementations of the first aspect, the combiner is arranged at an output end of the amplification module.

[0017] In the second aspect, the embodiments of the application provide an optical fiber communication system, including an optical amplification site, and the optical amplification site includes the optical fiber amplifier as described above, and is configured to amplify the input signal light. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 An optical fiber communication network diagram to which the embodiments of the application can be applied is shown.

[0019] Figure 2 A basic structure diagram of an optical fiber amplifier is shown.

[0020] Figure 3 A device diagram of an L-band optical fiber amplifier based on C-band pump light is shown.

[0021] Figure 4 A schematic diagram of an optical fiber amplifier 400 provided by the embodiments of the application is shown.

[0022] Figure 5 A schematic diagram of an optical fiber amplifier 500 provided by the embodiments of the application is shown.

[0023] Figure 6 A schematic diagram of an optical fiber amplifier 600 provided by the embodiments of the application is shown.

[0024] Figure 7 A schematic diagram of an optical fiber amplifier 700 provided by the embodiments of the application is shown.

[0025] Figure 8 A schematic diagram of an optical fiber amplifier 800 provided by the embodiments of the application is shown.

[0026] Figure 9 A schematic diagram of an optical fiber amplifier 900 provided by the embodiments of the application is shown.

[0027] Figure 10 A schematic diagram of an optical fiber amplifier 1000 is shown.

[0028] Figure 11 A schematic diagram of an optical fiber amplifier 1100 is shown.

[0029] Figure 12 A schematic diagram of an optical fiber amplifier 1200 is shown. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0031] The technical solutions in the embodiments of the present application can be applied in an optical fiber communication network, for example, the technical solutions in the embodiments of the present application can be applied in an optical fiber amplifier in the optical fiber communication network. The optical fiber amplifier is mainly located in an optical amplification site and an optical amplification network element in the optical fiber communication network. The technical solutions in the embodiments of the present application can be used to implement an optical fiber amplifier that amplifies L-band signals.

[0032] Figure 1 is a schematic diagram of an application scenario applicable to the embodiments of the present application. In the optical fiber communication network, an optical transmitter and an optical receiver can be included, and one or more optical fiber amplifiers can also be included. As shown in Figure 1 , the optical fiber amplifier is mainly located in the middle of an optical fiber line (or line optical fiber) in the optical fiber communication network, to amplify optical signals and extend the transmission distance of the optical signals.

[0033] It should be understood that the above Figure 1 is only an example for illustration, and the present application is not limited thereto. For example, more optical devices can also be included in the optical fiber communication network, or the embodiments of the present application can also be applied in any scenario including an optical fiber amplifier.

[0034] To facilitate understanding of the embodiments of the present application, first Figure 2 introduce the optical fiber amplifier. As shown in Figure 2 , the optical fiber amplifier can include, but is not limited to, a pump laser, a wavelength division multiplexer (WDM), an isolator, and a gain optical fiber. The pump laser generates pump light, and the WDM can combine the input optical signal (or input signal light) and the pump light together and deliver them to the gain optical fiber. The gain optical fiber can be an optical fiber in which a gain medium is doped. In the gain optical fiber, the pump light excites the gain medium ions in the gain optical fiber to a high energy level, and when the input optical signal is input, the gain medium ions in the gain optical fiber will jump from the high energy level to the low energy level, and stimulated emission will occur, thereby amplifying the input optical signal and obtaining the output optical signal.

[0035] In the fiber amplifier, the connection between the gain fiber and the WDM, the connection between the gain fiber and the isolator, can generally adopt the way of fiber fusion, so as to reduce the loss and the noise figure. For example, in Figure 2 , the pigtail of the WDM is fused together with the gain fiber, and the pigtail of the isolator is fused together with the gain fiber. In the fiber communication network, the commonly used gain fiber in the fiber amplifier is an erbium-doped fiber with a quartz glass matrix, and then the pigtail of the WDM and the isolator and other optical devices can generally adopt the quartz glass matrix fiber, that is, the matrix of the two is the same.

[0036] At present, in the fiber amplifier for amplifying L-band light, in order to improve the pumping efficiency of the L-band optical amplifier, compared with the traditional 980nm or 1480nm pumping, a long-wavelength pumping with higher pumping efficiency is selected, for example, the C-band light of 1530nm is used as the pumping light to amplify the signal light of the L-band. For example, in Figure 3 , a multi-stage (three-stage) L-band fiber amplifier is shown. Figure 3 In the three-stage L-band fiber amplifier, the first stage of the three-stage L-band amplifier uses the traditional 980nm pumping to achieve the same noise figure (NF), and the last two stages use the 1530nm pumping with higher pumping efficiency to achieve higher efficiency L-band light amplification.

[0037] However, due to the difficulty and high cost of obtaining high-power C-band pumping signals, and the fact that this scheme cannot essentially suppress the accumulation of amplified spontaneous emission (ASE) generated during optical amplification, the application scenarios are limited.

[0038] In view of this, the present application provides an amplifier for L-band optical amplification and a method for amplifying optical signals. By introducing C-band signal light to suppress the accumulation of C-band ASE, the consumption of pumping light power by C-band ASE is reduced, thereby improving the pumping efficiency of L-band signal light amplification. In addition, the amplifier for L-band optical amplification and the method for amplifying optical signals provided by the present application can realize dynamic gain adjustment of L-band optical amplification by feedback adjusting the power and / or wavelength of the introduced C-band signal light.

[0039] The various embodiments provided by the present application will be described in detail below with reference to the accompanying drawings.

[0040] In order to facilitate understanding of the embodiments of the present application, the following description is made.

[0041] First, in the embodiments of this application shown below, the terms "first," "second," "third," "fourth," and various numerical designations are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. For example, distinguishing different states of optical signals after different steps, etc.

[0042] Second, in the embodiments of this application shown below, the various optical elements are connected by optical fibers. Specifically, the input or output pigtails of each element and the transmission optical fiber together constitute a section of optical fiber, which is used for the transmission of signal light between the elements.

[0043] Third, in the embodiments of this application shown below, "and / or" can be used to describe three relationships between associated objects. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. Where A and B can be singular or plural.

[0044] Figure 4 A schematic diagram of an optical fiber amplifier 400 according to an embodiment of this application is shown. The optical fiber amplifier 400 can be used to amplify L-band signal light.

[0045] In one feasible way, such as Figure 4 As shown, the amplifier 400 may include:

[0046] Single-stage amplification module 410, auxiliary light source 420, and wave combiner 430.

[0047] The single-stage amplifier module 410 is used to receive the input signal light and amplify the input signal light using pump light to obtain the output signal light.

[0048] The auxiliary light source 420 is used to generate auxiliary light.

[0049] The combiner 430 is used to couple auxiliary light into the amplification module.

[0050] The input signal light has an L-band wavelength, the auxiliary light has a C-band wavelength, and the power of the auxiliary light is less than both the power of the input signal light and the power of the pump light.

[0051] The single-stage amplification module 410 may include a first WDM 411, an EDF 412, and a pump light source 413, which may be a 980nm or 1480nm laser pump.

[0052] Specifically, the light source 420 of the auxiliary light generates C-band auxiliary light, which is input into the coupler 430 through an optical fiber. The coupler 430 couples the received L-band input signal light and the C-band auxiliary light to generate first coupled signal light, which is input into the input end of the first WDM 411 through an output optical fiber. The first WDM 411 couples the first coupled signal light and the pump light generated by the light source 413 of the pump light to generate second coupled signal light, which is input into the input end of the EDF 412 through an output optical fiber. The EDF 412 amplifies the L-band input signal light in the first coupled signal light by using the pump light in the second coupled signal light to obtain amplified L-band output signal light.

[0053] It should be noted that the light source 420 of the auxiliary light can be a semiconductor light-emitting diode, a laser diode, or a fiber laser.

[0054] According to the principle of the fiber amplifier, the erbium ions in the EDF 412 absorb the photon transition of the pump light to a high energy level, and then return to the ground state through stimulated emission, while releasing photons of the same wavelength as the L-band input signal light, thereby realizing amplification of the signal light.

[0055] It should be noted that when the EDF 412 is pumped by 980 nm or 1480 nm laser light, it will also be accompanied by EDF-based ASE. That is, as the pump light is strengthened, the particle number will present an inverted distribution, and the spontaneous emission light generated by the high-energy level atoms is constantly amplified when propagating in the optical fiber, forming C-band ASE and L-band ASE. The difference is that after the erbium ions absorb 980 nm or 1480 nm pump laser light, C-band ASE will first be generated at the front end of the EDF 412. The generated C-band ASE is then absorbed by the rear-end EDF 412 as a secondary pump source, thereby shifting the ASE spectrum to the L-band to form the L-band ASE spectrum. Since the L-band ASE uses the tail of the erbium ion gain band, its emission and absorption coefficients are much lower than those of the C-band, and only a relatively long EDF can produce a more obvious L-band ASE. Therefore, the ASE that affects the pump conversion efficiency is mainly the C-band ASE.

[0056] In order to eliminate the consumption of the optical power of the pump light by the C-band ASE, the present application simultaneously inputs C-band auxiliary light into the EDF 412. The optical power of the C-band auxiliary light is relatively large, so the C-band auxiliary light will first consume the optical power of the pump light. Since the C-band auxiliary light is a narrow-band light source compared with the broadband C-band ASE light source, when the same gain is obtained, the C-band auxiliary light consumes less optical power of the pump light than the C-band ASE, thereby suppressing the C-band ASE.

[0057] Based on the above scheme, the amplifier provided in the application can realize the suppression of the C-band ASE by introducing the auxiliary light of the C band, thereby improving the pumping efficiency of the L-band optical amplifier and improving the gain performance of the L-band optical amplifier.

[0058] In another implementable manner, as shown in the figure, the amplifier 400 can further include: Figure 4

[0059] The first isolator 440 and / or the second isolator 450.

[0060] Specifically, the amplifier 400 can include the first isolator 440.

[0061] It should be understood that in the amplifier or the system including the amplifier, due to the existence of other elements at the output end of the gain fiber, even if the elements are tightly coupled with the connected gain fiber, there will be a part of light passing through the elements and being reflected back into the gain fiber. Therefore, a first isolator 440 can be arranged at the output end of the gain fiber, which can be used to isolate the reflected light from the output end of the gain fiber, so as to avoid the reflected light entering the gain fiber to change the key performance indicators such as noise index, and reduce the adverse effects of the reflected light on the spectral output power stability of the light source.

[0062] Based on the above scheme, the amplifier provided in the application can isolate the influence of the reflected light at the output end on the amplification effect of the gain fiber, thereby improving the quality of the output signal light.

[0063] Alternatively, the amplifier 400 can include the first isolator 440 and the second isolator 450.

[0064] It should be understood that in the optical fiber amplifier, along with the activation particles returning from the excited state to the ground state and amplifying the optical signal, the random incoherent spontaneous radiation of the stimulated particles will also be generated. Such spontaneous radiation can be in any direction and can cause further stimulated radiation and can be amplified. In short, non-signal band amplification, i.e., ASE noise, will be generated in the amplification process. The ASE noise can leak from the input end of the gain fiber, thereby affecting the performance of the front-end components. Therefore, a second isolator 450 can be arranged at the input end of the gain fiber, which can be used to isolate the ASE noise leaking from the input end of the gain fiber.

[0065] Based on the above scheme, the amplifier provided in the application can eliminate the reverse ASE noise at the input end of the gain fiber, while isolating the influence of the reflected light at the output end on the amplification effect of the gain fiber, thereby improving the working stability of the optical fiber amplifier and improving the quality of the output signal light.

[0066] Figure 5 ​A schematic diagram of the optical fiber amplifier 500 proposed in the embodiments of the present application is shown, which can be used for amplifying L-band signal light.

[0067] Compared with the amplifier 400 shown in the Figure 4 In the amplifier 500, the combiner 530 is placed at the output end of the single-stage amplification module 510. The combiner 530 reversely inputs C-band auxiliary light from the output end of the single-stage amplification module 510.

[0068] Specifically, the light source 520 of the auxiliary light generates C-band auxiliary light, which is input into the combiner 530 through an optical fiber. The combiner 530 inputs the received C-band auxiliary light into the EDF through an output optical fiber. The first WDM 511 couples the L-band input signal light and the pump light generated by the light source 513 of the pump light into the third coupled signal light, and inputs the third coupled signal light into the input end of the EDF 512 through an output optical fiber. The EDF 512 amplifies the L-band input signal light by using the pump light in the third coupled signal light, and obtains the amplified L-band output signal light.

[0069] In an implementable manner, as shown in Figure 5 The amplifier 500 can further include a first isolator 540 and / or a second isolator 550.

[0070] It should be noted that the functions of the first isolator 540 and the second isolator 550 in the amplifier 500 can be correspondingly referred to the related descriptions in Figure 4 For the sake of simplicity, the details are not described herein.

[0071] In addition, it should be noted that in the embodiments of the present application, along the transmission direction of the L-band output signal light, the combiner 530 should be located before the first isolator 540.

[0072] It should be understood that other elements in the amplifier 500 can be correspondingly referred to the related descriptions in Figure 4 For the sake of simplicity, the details are not described herein.

[0073] Based on the above scheme, the amplifier provided in the present application can realize the suppression of C-band ASE by introducing C-band auxiliary light, thereby improving the pumping efficiency of the L-band optical amplifier and improving the gain performance of the L-band optical amplifier.

[0074] It should be understood that the energy provided by a single pump source for a laser gain medium is limited, and often cannot meet the demand of a high-power laser. Therefore, the scheme provided in the embodiments of the present application can improve the pumping manner, that is, a bidirectional pumping manner is adopted, for example Figure 6 and Figure 7Amplifiers 600 and 700 are shown. By designing the amplifier structure, bidirectional pumping is used to provide greater energy to the amplifier, thereby obtaining high-power laser output.

[0075] It should be noted that, for Figure 6 The amplifier 600 shown can be a pair Figure 4 The amplifier 400 shown has undergone structural improvements; therefore, for the sake of simplicity, other components in the amplifier 600 can be referred to accordingly. Figure 4 The relevant explanations in the document will not be repeated here. For Figure 7 The amplifier 700 shown can be a pair Figure 5 The amplifier 700 shown has undergone structural improvements; therefore, for simplicity of explanation, other components in the amplifier 700 can be referred to accordingly. Figure 5 The relevant explanations will not be repeated here.

[0076] Currently, to achieve dynamic gain adjustment of the amplified L-band output light by an amplifier, the embodiments provided in this application introduce a C / L splitter at the amplifier output to filter out the C-band wavelength light and detect the optical power. By adjusting the optical power and / or wavelength of the C-band auxiliary light through feedback, dynamic gain adjustment of the L-band optical amplification is achieved. Based on... Figure 4 to Figure 7 The amplifier shown in the embodiment of this application provides, as described above. Figure 8 to Figure 11 The amplifier structure shown.

[0077] For the sake of simplicity, Figure 8 The amplifier 800 shown illustrates the dynamically gain-adjustable L-band optical amplifier provided in this application.

[0078] Figure 8 A schematic diagram of an optical fiber amplifier 800 according to an embodiment of this application is shown. The optical fiber amplifier 800 can be used to amplify L-band signal light.

[0079] In one feasible way, such as Figure 8 As shown, the amplifier 800 may include:

[0080] The single-stage amplifier module 810, the auxiliary light source 820, the multiplexer 830, the demultiplexer 860, and the photodetector (PD) 870 are included.

[0081] The single-stage amplifier module 810 is used to receive the input signal light and amplify the input signal light using pump light to obtain the output signal light.

[0082] The combiner 830 is used to couple auxiliary light into the amplification module.

[0083] A wavelength division multiplexer 860 is configured to separate the C-band to-be-measured light from the output signal light.

[0084] A PD 870 is configured to measure the optical power of the C-band to-be-measured light.

[0085] The light source 820 of the auxiliary light is configured to generate the auxiliary light, and adjust the wavelength of the auxiliary light and / or the optical power of the auxiliary light based on the optical power of the to-be-measured light.

[0086] The wavelength of the input signal light is L-band signal light, the wavelength of the auxiliary light is C-band light wavelength, and the optical power of the auxiliary light is less than the optical power of the input signal light and the optical power of the pump light.

[0087] The single-stage amplification module 810 can include a first WDM 811, an EDF 812, and a light source 813 of pump light, which can be a 980 nm or 1480 nm laser pump.

[0088] Specifically, the light source 820 of the auxiliary light generates C-band auxiliary light, which is input into the combiner 830 through an optical fiber. The combiner 830 couples the received L-band input signal light and the C-band auxiliary light to generate a first coupled signal light, and inputs the first coupled signal light into the input end of the first WDM 811 through an output optical fiber. The first WDM 811 couples the first coupled signal light and the pump light generated by the light source 813 of the pump light to generate a second coupled signal light, and inputs the second coupled signal light into the input end of the EDF 812 through an output optical fiber. The EDF 812 amplifies the L-band input signal light in the first coupled signal light using the pump light in the second coupled signal light to obtain amplified L-band output signal light. The L-band output signal light is transmitted to the input end of the wavelength division multiplexer 860 through an optical fiber. After receiving the output signal, the wavelength division multiplexer 860 divides the output signal light into two paths according to the wavelength, one of which is the amplified L-band light output from the output end of the amplifier 800, and the other of which is the C-band to-be-measured light transmitted to the PD 870 through an optical fiber. The PD 870 detects the optical power of the to-be-measured light, and the detection result can be used to adjust the wavelength and / or power of the auxiliary light by the light source of the auxiliary light.

[0089] For example, in an implementable manner, the PD 870 can prestore the corresponding relationship between the optical power of the C-band to-be-measured light and the gain of the L-band output signal light, and the light source 820 of the C-band auxiliary light is set with corresponding parameters according to the corresponding relationship, so as to change the optical wavelength and / or power of the output auxiliary light to achieve the gain of the target L-band output signal light.

[0090] Alternatively, in another implementable manner, a threshold of the optical power of the C-band to-be-measured light can be pre-stored in the PD 870, and below the threshold, it indicates that the gain of the L-band output signal light output by the amplifier 800 is small, at this time, the corresponding parameters of the light source 820 of the C-band auxiliary light can be set to change the wavelength and / or power of the output auxiliary light, so as to realize the gain of the target L-band output signal light. Of course, the opposite threshold mechanism can also be set, for example, below the threshold, it indicates that the gain of the L-band output signal light output by the amplifier 800 is large, at this time, the corresponding parameters of the light source 820 of the C-band auxiliary light can be set to change the wavelength and / or power of the output auxiliary light, so as to realize the gain of the target L-band output signal light.

[0091] It should be understood that the "preset" can include pre-definition, for example, the corresponding code, table or other means for indicating related information can be pre-stored in the PD 870, and the specific implementation manner of the present application is not limited.

[0092] It should be noted that the light source 820 of the auxiliary light can be a semiconductor light-emitting diode, a laser diode or a fiber laser.

[0093] Based on the above scheme, the amplifier provided by the present application can realize the suppression of the C-band ASE by introducing the C-band auxiliary light, so as to improve the pumping efficiency of the L-band optical amplifier and improve the gain performance of the L-band optical amplifier. At the same time, by utilizing the correlation between the C-band optical power and the L-band signal amplification gain, the power and / or wavelength of the C-band auxiliary light can be adjusted by detecting the C-band optical power at the output end of the optical amplifier, so as to realize the dynamic gain adjustment of the L-band optical amplifier.

[0094] Optionally, the amplifier 800 can further include a filter 880, which is used to filter out the C-band spontaneous emission noise in the C-band to-be-measured light.

[0095] In another implementable manner, as shown in Figure 8 The amplifier 800 can further include:

[0096] The first isolator 840 and / or the second isolator 850.

[0097] The first isolator 840 is used to isolate the reflected light from the output end of the gain fiber, so as to avoid the reflected light into the gain fiber to change the key performance indicators such as noise index, and reduce the adverse effects of the reflected light on the spectral output power stability of the light source.

[0098] The second isolator 850 is used to isolate the ASE noise leaked from the input end of the gain fiber.

[0099] It should be understood that Figure 9 - Figure 11 They are all in Figure 5 - Figure 7 Based on this, the aforementioned feedback adjustment structure was added. For the sake of simplicity, Figure 9 - Figure 11 The functions of each component can be referred to the above. Figure 5 - Figure 7 and combined Figure 8 The relevant explanations will not be repeated here.

[0100] Figure 12 A schematic diagram of an optical fiber amplifier 1200 according to an embodiment of this application is shown. The optical fiber amplifier 1200 can be used to amplify L-band signal light in multiple stages and / or to dynamically adjust the gain of L-band signal light.

[0101] It should be understood that Figure 12 The amplifier 1200 shown can be based on Figure 4 The structure of the amplifier 400 or Figure 5 The structure of the amplifier 500 or Figure 6 The structure of the amplifier 600 or Figure 7 The structure of the amplifier 700 is cascaded to realize multiple stages of high-pump-efficiency L-band optical amplifiers.

[0102] Or that Figure 12 The amplifier 1200 shown can be based on Figure 8 The structure of the amplifier 800 or Figure 9 The structure of the amplifier 900 or Figure 10 The structure of the amplifier 1000 or Figure 11 The structure of the amplifier 1100 is cascaded to realize a multi-stage high-pump-efficiency L-band dynamic optical power adjustable optical amplifier.

[0103] In one feasible approach, a gain-flattening filter or a tunable optical attenuator can be introduced between each amplification stage of the amplifier 1200 to adjust the gain spectrum.

[0104] Regarding the above Figure 4 to Figure 12 In the embodiments described, it should be noted that:

[0105] (1) The numbering of each element, module or structure described in the embodiments is only an example and does not constitute a limitation of this application. In the embodiments of this application, some elements, modules or structures may be added or deleted based on each structural diagram according to actual needs.

[0106] (2) The above Figure 4 to Figure 12 The embodiments can be implemented independently or in combination, for example... Figure 4 The illustrated embodiments and Figure 12 The illustrated embodiments are combined with each other. Figure 5 The illustrated embodiments and Figure 12The embodiments shown are combined with each other, etc.

[0107] Those skilled in the art can clearly understand that the steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0108] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the method described above can refer to the corresponding process in the foregoing device embodiments, which will not be described here

[0109] In the above embodiments, all or part can be realized by software, hardware, firmware, or any combination thereof.

[0110] When implemented by using software, it can be realized in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the flow or function described in the embodiments of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. For example, the computer can be a personal computer, a server, or a network device, etc. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. For the computer readable storage medium, please refer to the description above.

[0111] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims and the description.

Claims

1. An amplifier characterized by, The amplifier comprises: at least one amplification module, at least one auxiliary light source, and at least one coupler, the amplification module comprising an erbium-doped optical fiber, the amplification module receives input signal light and amplifies the input signal light by using pump light to obtain output signal light, the input signal light being L-band signal light; the auxiliary light source is configured to generate auxiliary light, the auxiliary light being C-band light, the optical power of the auxiliary light being less than the optical power of the input signal light, and the optical power of the auxiliary light being less than the optical power of the pump light; the coupler is configured to couple the auxiliary light into the amplification module.

2. The amplifier of claim 1, wherein The amplifier further comprises: a wavelength division demultiplexer, a pump light source, the wavelength division demultiplexer is configured to couple the pump light into the erbium-doped optical fiber; the pump light source is configured to generate the pump light.

3. The amplifier of claim 2, wherein, 5. The amplifier of any one of claims 1 to 4, wherein: the wavelength of the pump light is less than the wavelength of C-band signal light, and the wavelength of the pump light is 980 nm or 1480 nm.

4. The amplifier of any one of claims 1 to 3, wherein, 6. The amplifier of any one of claims 1 to 5, wherein: the coupler is arranged at the input end of the amplification module, and the coupler is further configured to couple the input signal light and the auxiliary light to generate first coupled signal light, wherein the coupler is configured to couple the auxiliary light into the amplification module, comprising: the coupler is configured to couple the first coupled signal light into the amplification module.

7. The amplifier of any one of claims 1 to 5, wherein: the coupler is arranged at the output end of the amplification module. The optical amplification site comprises the amplifier of any one of claims 1 to 7, and the amplifier is configured to amplify the input signal light. ​ ​ ​ ​ 8. An optical fiber communication system, characterized by, ​ ​

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