Processing module for doped optical fiber amplifier and related device of processing module

Abstract

Embodiments of the present application provide a processing module for a doped optical fiber amplifier, and a related device of the processing module, used for suppressing a surge phenomenon. The processing module provided in the embodiments of the present application comprises a splitter, a combiner, a first waveguide, and an idle-frequency optical unit. The splitter is connected to an upstream optical path, the first waveguide and the idle-frequency optical unit, and is used to split an optical signal from the upstream optical path, and transmit same to the first waveguide and the idle-frequency optical unit. The combiner is connected to the first waveguide, the idle-frequency optical unit and a doped optical fiber, and is configured to couple light from the first waveguide and the idle-frequency optical unit to the doped optical fiber. The idle-frequency optical unit is used to generate an idle-frequency optical pulse on the basis of the optical signal. The first waveguide is used to provide an optical path difference. A time when the optical signal arrives at the doped optical fiber is later than a time when the idle-frequency optical pulse arrives at the doped optical fiber, and is earlier than a time when the number of high energy level particles on the doped optical fiber is restored.

Description

A processing module for a doped fiber amplifier and related equipment for the processing module.

[0001] This application claims priority to Chinese Patent Application No. 202411551327.8, filed with the State Intellectual Property Office of China on October 31, 2024, entitled "A Processing Module for a Doped Fiber Amplifier and Related Devices for the Processing Module", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical communication, and in particular to a processing module for a doped fiber amplifier and related equipment for the processing module. Background Technology

[0003] Doped fiber amplifiers are a commonly used type of optical amplifier. Taking erbium-doped fiber amplifiers as an example, erbium ions are doped into the optical fiber, and the stimulated emission of erbium ions is used to amplify the optical signal.

[0004] Before the optical signal is input into the erbium-doped fiber, the erbium ions within the fiber undergo absorption and non-radiative transitions under the influence of pump light, resulting in a metastable state with high energy. With the input of the optical signal, the erbium ions in the metastable state E2 will transition to the ground state E1 via stimulated emission, emitting identical photons identical to those in the optical signal. These identical photons, in turn, induce further stimulated emission, generating even more photons, thus amplifying the optical signal.

[0005] Before the optical signal is input or when the input power is low, metastable erbium ions accumulate continuously. If the input optical power suddenly increases, the output optical power will also suddenly increase due to the sufficient erbium ions in the metastable state. This output optical power may then be much higher than the stable operating optical power, potentially damaging devices in the subsequent stages of the erbium-doped fiber amplifier. This phenomenon is called surge. Summary of the Invention

[0006] This application provides a processing module for a doped fiber amplifier and related equipment for suppressing surge phenomena.

[0007] In a first aspect, embodiments of this application provide a processing module for a doped fiber amplifier. The processing module includes a splitter, a combiner, a first waveguide, and an idler unit. The splitter is connected to an upstream optical path, the first waveguide, and the idler unit, and is used to split and transmit optical signals from the upstream optical path to the first waveguide and the idler unit. The combiner is connected to the first waveguide, the idler unit, and the doped fiber, and is used to couple and transmit optical signals from the first waveguide and the idler unit to the doped fiber. The idler unit is used to generate idler optical pulses based on the optical signals. The first waveguide is used to provide an optical path difference. The arrival time of the optical signal in the doped fiber is later than the arrival time of the idler optical pulse in the doped fiber, but earlier than the time of high-energy-level particle number recovery on the doped fiber.

[0008] In this embodiment, the input optical signal of the doped fiber amplifier triggers the idler unit 3400 to generate an idler optical pulse, which enters the doped fiber before the optical signal. This idler optical pulse preemptively consumes high-energy particles in the doped fiber. When the optical signal reaches the doped fiber after passing through the first waveguide 3300, the number of high-energy particles in the doped fiber has been reduced to a low level by the idler optical pulse, preventing surges and thus limiting the output light intensity of the doped fiber amplifier, thereby protecting the downstream devices of the doped fiber amplifier.

[0009] In one alternative implementation, an idler light pulse enters the doped fiber, generating a falling edge that increases the number of high-energy-level particles in the doped fiber. The idler light pulse leaves the doped fiber, generating a rising edge that increases the number of high-energy-level particles in the doped fiber. The first time period is defined as the time between the start point of the falling edge and the end point of the rising edge. The time when the optical signal arrives at the doped fiber is within the first time period.

[0010] In one alternative implementation, the idler pulse includes a rising edge and a falling edge.

[0011] In one alternative implementation, the idler optical unit includes an optical intensity monitoring unit and an idler optical generation unit. The optical intensity monitoring unit is connected to the splitter and is used to monitor the intensity of the optical signal. The idler optical generation unit is connected to the combiner and is used to generate an idler optical pulse when the intensity of the optical signal is greater than a first threshold.

[0012] In this embodiment, the idler light generation unit 3420 determines whether to generate an idler light pulse to suppress surge phenomena based on whether the intensity of the light signal is greater than a first threshold. By not introducing idler light pulses into the doped fiber when the light intensity is low (less than the first threshold), the gain of the doped fiber amplifier during normal operation can be improved.

[0013] In one alternative implementation, the light intensity monitoring unit is also used to monitor the rising edge of the optical signal. The idler light generation unit is also used to generate idler light pulses based on the rising edge of the optical signal.

[0014] In this embodiment, the light intensity monitoring unit triggers the idler light generation unit to generate an idler light pulse based on the rising edge of the input light signal, thereby suppressing surge phenomena on the doped fiber. This structure can react quickly in the event of a surge in light intensity caused by electrostatic discharge, loose connection in the modulator bias circuit, or malfunction, promptly reducing the number of high-energy particles in the doped fiber, thereby suppressing surge phenomena and protecting the device.

[0015] In one alternative implementation, the light intensity monitoring unit includes a photodiode that converts the rising edge of an optical signal into an electrical signal pulse. The idler light generation unit includes a laser that generates an idler light pulse based on the electrical signal pulse.

[0016] In one alternative implementation, the laser is used to generate an idler light pulse when the intensity of the electrical signal pulse is greater than a second threshold.

[0017] In the embodiments of this application, the laser can determine the intensity and pulse width of the generated idler light pulse based on the intensity and duration of the electrical signal, so as to adaptively consume the high-energy particles in the doped fiber for different scenarios and achieve reasonable control over the number of high-energy particles.

[0018] For example, the second threshold can be divided into multiple levels, generating idler light pulses of different intensities based on the triggering of different electrical signals. When the input light signal intensity is high, the corresponding second threshold level is higher (larger voltage or current), which corresponds to the generation of a higher intensity idler light pulse. This consumes more high-energy particles in the doped fiber, preventing strong surges caused by high-intensity input light signals from damaging the device.

[0019] In one alternative implementation, the idler optical unit is a frequency shifter, and the optical signal includes optical signal pulses. The frequency shifter is used to shift the frequency of the input optical signal pulses to obtain idler optical pulses.

[0020] In one alternative implementation, the first waveguide includes an optical fiber, a silicon waveguide, or a planar waveguide.

[0021] In an alternative implementation, the processing module further includes an optical filter. The optical filter is used to filter out idler pulses from the light coming from the doped fiber and retain the amplified optical signal.

[0022] Secondly, embodiments of this application provide a doped fiber amplifier. The doped fiber amplifier includes a doped fiber and a processing module for the doped fiber amplifier, the processing module being the processing module described in the first aspect or its implementation. The doped fiber is connected to a combiner in the processing module.

[0023] In one alternative implementation, the doped fiber includes erbium-doped fiber, ytterbium-doped fiber, or erbium-ytterbium co-doped fiber.

[0024] In one alternative implementation, the doped fiber amplifier also includes an optical filter. The optical filter is used to filter out idler pulses from the light coming from the doped fiber and retain the amplified optical signal.

[0025] Thirdly, embodiments of this application provide an optical communication device. This optical communication device includes a doped fiber amplifier and an optical waveguide, wherein the doped fiber amplifier is the doped fiber amplifier described in the second aspect or its implementation. The optical waveguide is connected to the doped fiber amplifier and is used to receive the optical signal amplified by the doped fiber amplifier.

[0026] Fourthly, embodiments of this application provide an optical communication system. This optical communication system includes one or more optical communication devices, wherein the optical communication devices are those described in the third aspect.

[0027] The beneficial effects of the second to fourth aspects are described in the first aspect and will not be repeated here. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the working principle of the doped fiber amplifier provided in this application;

[0029] Figure 2a is a schematic diagram of the application scenario of the doped fiber amplifier provided in the embodiment of this application;

[0030] Figure 2b is a schematic diagram of a doped fiber amplifier provided in an embodiment of this application;

[0031] Figure 3 is a schematic diagram of the processing module of the doped fiber amplifier provided in an embodiment of this application;

[0032] Figure 4 is a schematic diagram of a processing module including a light intensity monitoring unit and an idler light generation unit provided in an embodiment of this application;

[0033] Figure 5 is a schematic diagram of a processing module including a photodiode and a laser provided in an embodiment of this application;

[0034] Figure 6 is a signal diagram of the processing module provided in an embodiment of this application;

[0035] Figure 7 is a schematic diagram of a processing module including a frequency shifter provided in an embodiment of this application;

[0036] Figure 8 is a structural schematic diagram of an optical communication device provided in an embodiment of this application. Detailed Implementation

[0037] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0038] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of units is not necessarily limited to those units, but may include other units not explicitly listed or inherent to those processes, methods, products, or apparatuses. Additionally, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can be expressed as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0039] Doped fiber amplifiers are a commonly used type of optical amplifier. Taking erbium-doped fiber amplifiers as an example, erbium-doped fiber amplifiers amplify optical signals by doping erbium ions into the optical fiber and utilizing the stimulated emission of erbium ions.

[0040] As shown in Figure 1, erbium ions have three working energy levels: E1, E2, and E3. The E1 level has the lowest energy and is called the ground state; the E2 level is a metastable state; and the E3 level has the highest energy and is called the excited state.

[0041] Erbium ions are in their lowest energy level, E1, without any optical excitation. When pump light enters the erbium-doped fiber, the particles in the E1 ground state gain energy and transition from the E1 level to the E3 level. Since the particles are unstable at the E3 level, they will quickly transition to the metastable E2 level via a nonradiative transition. At the E2 level, the particles have a relatively long lifespan.

[0042] As the pump source continuously excites the particles, the number of particles in the E2 level increases and the number of particles in the E1 level decreases, thus achieving a population inversion distribution (the number of particles in the E2 level is greater than the number of particles in the E1 level). This enables the erbium-doped fiber to achieve optical amplification.

[0043] As shown in Figure 1, if the photon energy of the input optical signal in the erbium-doped fiber is exactly equal to the energy difference between E2 and E1, the particle in the metastable state E2 will transition to the ground state E1 through stimulated emission, emitting identical photons identical to those in the input optical signal. These identical photons will then induce further stimulated emission, generating new photons, thus greatly increasing the number of photons. This transforms the input optical signal into a strong output optical signal in the erbium-doped fiber, achieving signal amplification.

[0044] Before the optical signal is input or when the input power is low, metastable erbium ions continuously accumulate. If the input optical power suddenly increases, the output optical power will also suddenly increase due to the sufficient erbium ions on the metastable E2 level. This output optical power may be much higher than the stable operating optical power, potentially damaging downstream devices of the erbium-doped fiber amplifier. This phenomenon is called surge. Surge phenomena also exist in other doped fiber amplifiers besides erbium-doped fiber amplifiers.

[0045] To address the surge phenomenon in doped fiber amplifiers, embodiments of this application provide a processing module for the doped fiber amplifier, the doped fiber amplifier itself, and an optical communication device. An idler light is generated based on the input optical signal, and the input optical signal is input to the doped fiber after the idler light, thereby suppressing the surge phenomenon on the doped fiber.

[0046] The doped fiber amplifier provided in this application embodiment can be applied to the communication system shown in Figure 2a. This communication system can be a wireless and optical fusion base station, satellite optical communication, optical phased array radar, fiber optic communication system, etc., and this application does not limit it to any particular type. The system includes an optical transmitting module, a pre-stage device of the doped fiber amplifier, a surge-protected EDFA (i.e., the doped fiber amplifier provided in this application embodiment), a post-stage device of the doped fiber amplifier, and an optical receiving module.

[0047] The optical transmitting module is responsible for generating signal light, which can be a light source such as a laser, or an optical signal transmitter that includes a light source. The signal light generated by the optical transmitting module passes through pre-stage devices to reach the EDFA (or other types of doped fiber amplifiers). The pre-stage devices can be any optical components such as optical fibers, modulators, and filters. Similarly, the post-stage devices can be any optical components such as optical fibers, modulators, and filters. Finally, the signal light is detected by the receiving module for further processing.

[0048] As shown in Figure 2b, the doped fiber amplifier provided in this embodiment includes a processing module 3000 for the doped fiber amplifier, a doped fiber, and an optical filter. The optical filter is used to filter out idler light from the light coming from the doped fiber and retain the amplified optical signal.

[0049] Optionally, the doped optical fiber may include erbium-doped optical fiber, ytterbium-doped optical fiber, erbium-ytterbium co-doped optical fiber, or doped optical fiber that may appear in the future; this application does not limit this.

[0050] Figure 3 is a schematic diagram of the processing module of the doped fiber amplifier provided in an embodiment of this application. As shown in Figure 3, the processing module 3000 includes a splitter 3100, a combiner 3200, a first waveguide 3300, and an idler optical unit 3400.

[0051] The splitter 3100 is used to connect to the upstream optical path of the doped fiber amplifier and to the first waveguide 3300 and the idler unit 3400 within the processing module 2000. The splitter 3100 is used to split and transmit the optical signal from the upstream optical path to the first waveguide 3300 and the idler unit 3400.

[0052] Combiner 3200 is used to connect to the doped optical fiber and to the first waveguide 3300 and idler unit 3400 within the processing module 3000. Combiner 3200 is used to couple and transmit the light from the first waveguide 3300 and idler unit 3400 to the doped optical fiber.

[0053] The idler unit 3400 is used to generate an idler optical pulse based on the optical signal. The first waveguide 3300 is used to provide the optical path difference. The optical signal (via the first waveguide 3300 and combiner 3200) arrives at the doped fiber later than the idler optical pulse (via the idler unit 3400 and combiner 3200) arrives at the doped fiber (i.e., the moment the idler optical pulse begins to consume high-energy particles on the doped fiber), but earlier than the moment when the number of high-energy particles on the doped fiber recovers.

[0054] In this embodiment, after the idler light pulse arrives at the doped fiber, it begins to consume the high-energy particles on the doped fiber. After the idler light pulse leaves the doped fiber, the number of high-energy particles on the doped fiber begins to increase (recovery begins). The time from the arrival of the idler light pulse at the doped fiber to the time when the number of high-energy particles on the doped fiber is completely recovered is called the first time period. The arrival of the optical signal at the doped fiber should fall within the first time period.

[0055] Among the high-energy-level particles, the frequency of the idler light pulse is different from that of the optical signal, and the frequencies of both the idler light pulse and the optical signal are within the operating frequency range of the doped fiber amplifier.

[0056] The first waveguide 3300 may include optical fiber, silicon waveguide or planar waveguide, and this application does not limit it.

[0057] In this embodiment, the input optical signal of the doped fiber amplifier triggers the idler unit 3400 to generate an idler optical pulse, which enters the doped fiber before the optical signal. This idler optical pulse preemptively consumes high-energy particles in the doped fiber. When the optical signal reaches the doped fiber after passing through the first waveguide 3300, the number of high-energy particles in the doped fiber has been reduced to a low level by the idler optical pulse, preventing surges and thus limiting the output light intensity of the doped fiber amplifier, thereby protecting the downstream devices of the doped fiber amplifier.

[0058] Since the idler pulse is a pulse signal, its consumption time for high-energy particles on the doped fiber is limited. The idler pulse begins to consume high-energy particles in the doped fiber after it enters the fiber, and the number of high-energy particles gradually recovers to its maximum level after it passes through. In this embodiment, the start and end points of the first time period are defined as the moment the idler pulse arrives on the doped fiber and begins to consume high-energy particles, and the moment the number of high-energy particles on the doped fiber is fully recovered.

[0059] Since the optical signal needs to pass through the first waveguide 3300 and the combiner 3200 to reach the doped fiber, the arrival time of the signal light in the doped fiber will be later than the first arrival time of the idler pulse. Furthermore, the signal light will arrive within the target duration after the first arrival time. As long as this target duration is less than the duration of the first time period, it can be ensured that when the optical signal arrives in the doped fiber, the high-energy particles in the doped fiber have been consumed to a lower level by the idler pulse, or the number of high-energy particles has not yet recovered to its maximum level. This reduces the number of stimulated transition particles generated in the doped fiber when the optical signal is input, suppressing surge phenomena.

[0060] In this application embodiment, the idler unit 3400 can have different structural designs, which will be described in detail below:

[0061] As shown in Figure 4, the idler frequency optical unit 3400 includes an optical intensity monitoring unit 3410 and an idler frequency optical generation unit 3420.

[0062] The optical intensity monitoring unit 3410 is connected to the splitter 3100 and is used to monitor the intensity of the optical signal split by the splitter 3100. The optical intensity monitoring unit 3410 is also connected to the idler frequency optical generation unit 3420.

[0063] The idler frequency optical generation unit 3420 is connected to the combiner 3200. The idler frequency optical generation unit 3420 is used to generate an idler frequency optical pulse when the intensity of the optical signal is greater than a first threshold.

[0064] In this embodiment, the idler light generation unit 3420 determines whether to generate an idler light pulse to suppress surge phenomena based on whether the intensity of the light signal is greater than a first threshold. By not introducing idler light pulses into the doped fiber when the light intensity is low (less than the first threshold), the gain of the doped fiber amplifier during normal operation can be improved.

[0065] In one example, as shown in Figure 5, the light intensity monitoring unit 3410 can be a photodiode 3411, and the idler light generation unit 3420 can be a laser 3421.

[0066] Photodiode 3411 performs photoelectric conversion on the optical signal from splitter 3100 to obtain an electrical signal, and transmits the electrical signal to laser 3421. Laser 3421 is triggered when the electrical signal intensity is greater than a second threshold, generating idler frequency optical pulses.

[0067] Optionally, the laser 3421 can determine the intensity and pulse width of the generated idler light pulse based on the intensity and duration of the electrical signal, so as to adaptively consume the high-energy particles in the doped fiber for different scenarios and achieve reasonable control over the number of high-energy particles.

[0068] For example, the second threshold can be divided into multiple levels, generating idler light pulses of different intensities based on the triggering of different electrical signals. When the input light signal intensity is high, the corresponding second threshold level is higher (larger voltage or current), which corresponds to the generation of a higher intensity idler light pulse. This consumes more high-energy particles in the doped fiber, preventing strong surges caused by high-intensity input light signals from damaging the device.

[0069] Optionally, the photodiode 3411 can also be triggered for photoelectric conversion under certain conditions, thereby initiating surge suppression. For example, the input optical signal includes a rising edge and a falling edge. When the intensity of the optical signal increases, i.e., when the rising edge of the optical signal is input to the photodiode 3411, the photodiode 3411 converts the rising edge of the optical signal into an electrical signal pulse and transmits this electrical signal pulse to the laser 3421. The laser 3421 can then generate an idler frequency optical pulse based on the electrical signal pulse.

[0070] In this embodiment, the photodiode 3411 triggers the laser 3421 to generate idler light pulses based on the rising edge of the input optical signal, thereby suppressing surge phenomena on the doped optical fiber. This structure can react quickly in the event of a surge in light intensity caused by electrostatic discharge, loose connection in the modulator bias circuit, or malfunction, promptly reducing the number of high-energy particles in the doped optical fiber, thereby suppressing surge phenomena and protecting the device.

[0071] In this embodiment, the optical signal and the idler optical pulse enter different devices (e.g., combiner 3200, doped fiber, etc.) at different times, as shown in Figure 6. Here, optical frequency 1 represents the frequency of the input optical signal to the doped fiber amplifier, and optical frequency 2 represents the frequency of the idler light. As shown in Figure 6, the order in which the optical or electrical signals appear on each device in the processing module 3000 is as follows:

[0072] 1. The input optical signal of splitter 3200 (i.e., the input optical signal of the doped fiber amplifier) ​​generates an instantaneous pulse at time t1, and the duration of the pulse is d. Here, a rectangular pulse is used as an example, but this does not limit the waveform of the input optical signal. The actual pulse can be smoother than a rectangle, or it can be other waveforms.

[0073] 2. The optical signal pulse reaches the photodiode 3411 after passing through the splitter 3100, and generates an electrical signal pulse at time t2.

[0074] 3. At time t3, the electrical signal pulse triggers the bias of laser 3421, generating an idler light pulse. The frequency of this idler light is at frequency 2. Frequency 2 is within the operating frequency range of the EDFA, but it is different from frequency 1.

[0075] 4. After passing through combiner 3200, the idler pulse reaches the EDFA at time t4. At the rising edge of the idler pulse (i.e., time t4), the high-energy particles in the EDFA begin to be consumed and decrease, resulting in a low number of high-energy particles that cannot cause a new surge. At the falling edge of the pulse, the number of high-energy particles gradually increases, returning to a relatively high steady state at time t6. In this embodiment, the time period between t4 and t6 is referred to as the first time period.

[0076] It is worth noting that when the idler light pulse is input to the EDFA, an overshoot (overshoot of the frequency 2 component, i.e., the surge of the idler light) will be generated at the output of the EDFA, as shown in Figure 6.

[0077] 5. The optical signal from the other output branch of splitter 3100 passes through the first waveguide 3300 and combiner 3200, and arrives at EDFA at time t5. Since some of the high-energy particles in EDFA have been consumed by the idler light pulse (frequency 2), the input signal light (frequency 1) will not overshoot, thus preventing surges.

[0078] In this embodiment, the first waveguide 3300 is used to provide an optical path difference, such that the time t5 when the optical signal arrives at the doped fiber via the first waveguide 3300 is later than the time t4 when the idler pulse arrives at the doped fiber, and earlier than the time t6 when the high-energy particles on the doped fiber recover to a steady state.

[0079] 6. The idler frequency optical component (frequency 2 component) in the EDFA output has an overshoot, but it will be filtered out by the optical filter and will not enter the subsequent devices, so it does not affect the original function of the system.

[0080] 7. The signal light component in the EDFA output does not have overshoot and can pass through the optical filter, and is output from the optical filter at time t7.

[0081] Optionally, in addition to a photodiode, the light intensity monitoring unit 3410 can also be a photoacoustic detector, etc.; in addition to a laser, the idler frequency light generation unit 3420 can also be an optical frequency conversion module, etc. This application does not limit this.

[0082] Optionally, in addition to the combination of light intensity monitoring unit 3410 and idler light generation unit 3420, the idler optical unit 3400 can also be a frequency shifter. As shown in Figure 7, when the input optical signal includes an optical signal pulse (i.e., including the rising edge), the frequency shifter 3430 is used to shift the frequency of the input optical signal pulse to obtain an idler optical pulse.

[0083] Optionally, trigger conditions can be set for frequency shifter 3430. When the light intensity input to frequency shifter 3430 is less than the third threshold, frequency shifter 3430 does not work; when the light intensity input to frequency shifter 3430 is greater than the third threshold, frequency shifter 3430 is triggered to work.

[0084] The frequency shifter 3430 can be a grating, a highly nonlinear optical fiber, etc., and this application does not limit it.

[0085] Applying any of the processing modules 3000 in Figures 3 to 7 to the doped fiber amplifier shown in Figure 2b yields the doped fiber amplifier provided in this embodiment. The doped fiber in Figure 2b is connected to the combiner 3200 of the processing module 3000.

[0086] The doped fiber amplifier provided in this embodiment includes a processing module 3000, a doped fiber, and an optical filter. One end of the doped fiber is connected to a combiner 3200 of the processing module 3000, and the other end is connected to the optical filter.

[0087] This application also provides an optical communication device. As shown in FIG8, the optical communication device includes a doped fiber amplifier and an optical waveguide. The doped fiber amplifier is the aforementioned doped fiber amplifier including the processing module 3000. The optical waveguide is connected to the doped fiber amplifier and is used to receive the optical signal amplified by the doped fiber amplifier.

[0088] Optionally, the optical communication device may be an OLT, ONU, or other similar device; this application does not limit this.

[0089] This application also provides an optical communication system. The system includes one or more optical communication devices as shown in FIG8.

[0090] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0094] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A processing module for a doped fiber amplifier, characterized in that, Includes splitter, combiner, first waveguide and idler unit; The splitter is connected to the upstream optical path, the first waveguide and the idler optical unit, and is used to split and transmit the optical signal from the upstream optical path to the first waveguide and the idler optical unit; The combiner is connected to the first waveguide, the idler unit, and the doped fiber, and is used to couple and transmit light from the first waveguide and the idler unit to the doped fiber. The idler frequency optical unit is used to generate an idler frequency optical pulse according to the optical signal; The first waveguide is used to provide an optical path difference, wherein the optical signal arrives at the doped fiber later than the idler pulse arrives at the doped fiber, but earlier than the time when the number of high-energy particles on the doped fiber is restored.

2. The processing module according to claim 1, characterized in that, The idler frequency optical pulse enters the doped fiber, generating a falling edge that increases the number of high-energy-level particles in the doped fiber. The idler frequency optical pulse leaves the doped fiber, generating a rising edge that increases the number of high-energy-level particles in the doped fiber. The first time period is from the start point of the falling edge to the end point of the rising edge. The time when the optical signal arrives at the doped fiber is within the first time period.

3. The processing module according to claim 1 or 2, characterized in that, The idler frequency optical pulse includes a rising edge and a falling edge.

4. The processing module according to any one of claims 1 to 3, characterized in that, The idler frequency optical unit includes an optical intensity monitoring unit and an idler frequency optical generation unit; The light intensity monitoring unit is connected to the splitter, and the light intensity monitoring unit is used to monitor the intensity of the light signal; The idler frequency optical generation unit is connected to the combiner, and the idler frequency optical generation unit is used to generate the idler frequency optical pulse when the intensity of the optical signal is greater than a first threshold.

5. The processing module according to claim 4, characterized in that, The light intensity monitoring unit is also used to monitor the rising edge of the light signal; The idler frequency light generation unit is also used to generate the idler frequency light pulse based on the rising edge of the optical signal.

6. The processing module according to claim 4 or 5, characterized in that: The light intensity monitoring unit includes a photodiode, which is used to convert the rising edge of the light signal into an electrical signal pulse. The idler frequency light generation unit includes a laser, which is used to generate the idler frequency light pulse based on the electrical signal pulse.

7. The processing module according to claim 6, characterized in that, The laser is used to generate the idler light pulse when the intensity of the electrical signal pulse is greater than a second threshold.

8. The processing module according to any one of claims 1 to 3, characterized in that, The idler optical unit is a frequency shifter, and the optical signal includes an optical signal pulse; The frequency shifter is used to shift the frequency of the input optical signal pulse to obtain the idler frequency optical pulse.

9. The processing module according to any one of claims 1 to 5, characterized in that, The first waveguide includes an optical fiber, a silicon waveguide, or a planar waveguide.

10. The processing module according to any one of claims 1 to 9, characterized in that, It also includes optical filters; The optical filter is used to filter out the idler light pulses from the light from the doped optical fiber and retain the amplified optical signal.

11. A doped fiber amplifier, characterized in that, A processing module including a doped optical fiber and a doped optical fiber amplifier, wherein the processing module is the processing module according to any one of claims 1 to 10; The doped optical fiber is connected to the combiner of the processing module.

12. The amplifier according to claim 11, characterized in that, The doped optical fiber includes erbium-doped optical fiber, ytterbium-doped optical fiber, or erbium-ytterbium co-doped optical fiber.

13. The amplifier according to claim 11 or 12, characterized in that, It also includes optical filters; The optical filter is used to filter out the idler light pulses from the light from the doped optical fiber and retain the amplified optical signal.

14. An optical communication device, characterized in that, It includes a doped fiber amplifier and an optical waveguide, wherein the doped fiber amplifier is the doped fiber amplifier according to any one of claims 11 to 13; The optical waveguide is connected to the doped fiber amplifier and is used to receive the optical signal amplified by the doped fiber amplifier.

15. An optical communication system, characterized in that, It includes one or more optical communication devices, wherein the optical communication device is the optical communication device of claim 14.

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