Fast fault-state dummy-wave optical power filling apparatus and optical wavelength division multiplexing transmission system

Abstract

The present invention relates to the technical field of communications. Provided are a fast fault-state dummy-wave optical power filling apparatus and an optical wavelength division multiplexing transmission system. The apparatus comprises a dummy wave seed light source, an optical switch, a first optical power measurement unit, and a control unit, wherein the first optical power measurement unit is provided on a transmission path of a real optical signal; the dummy wave seed light source is used for generating a dummy optical signal; the first optical power measurement unit is used for measuring the optical power of the real optical signal; the control unit is used for controlling the switching of the optical switch on the basis of the optical power of the real optical signal; and when the real optical signal is abnormal, an output end of the optical switch is switched to be connected to a first input end of the optical switch, so as to transmit the dummy optical signal to an optical amplifier, thereby reducing the impact on other channels in a downstream multiplex section. By means of the present invention, when signal light is abnormal, the optical amplifier can still work normally, and the output optical power and flatness are essentially consistent with those in a normal service connection, thereby minimizing the impact on other wavebands and downstream optical transmission links.

Description

Apparatus for filling in false optical power wave in fault state and optical wavelength division multiplexing transmission system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the following patent application:

[0003] (1) Chinese patent application No. 202410823966.9, filed on June 25, 2024, entitled “Apparatus for filling in false optical power wave in fault state and optical wavelength division multiplexing transmission system”. TECHNICAL FIELD

[0004] The present application relates to the field of communication technology, in particular to an apparatus for filling in false optical power wave in fault state and an optical wavelength division multiplexing transmission system. BACKGROUND

[0005] In a long-distance dense wavelength division multiplexing optical transmission system, due to the failure of part of the optical channels or devices, the state of the stimulated Raman scattering (SRS) effect in the optical fiber changes, which causes the optical power of other optical channels to change and results in service damage. There are two cases as follows:

[0006] Single-band failure of a dual-band optical transmission system affects the stability of the optical power of another band. A dual-band optical transmission system includes two independently gain-controlled optical amplification links, such as C-band and L-band, or C++-band and L++-band combinations. Taking the C-band and L-band, i.e., C+L optical transmission system as an example, other band combination modes are the same. In a dual-band optical transmission system, each optical power amplification node includes amplifiers for amplifying the optical power of two bands, i.e., C-band optical amplifier and L-band optical amplifier. The optical amplifiers of different bands in the same optical power amplification node can be independently packaged or co-packaged. After the optical power of two bands is amplified by the optical amplifiers and combined into the same optical fiber, the optical power of two bands will be transferred from short wavelength to long wavelength due to the Raman nonlinear scattering effect of the optical fiber, which is equivalent to the short wavelength having a larger equivalent fiber loss than the long wavelength. In actual operation, due to the failure of the link or device, the optical amplifier of a single band may be closed due to the loss of input light, and then in the next optical fiber span, due to the change in the state of the Raman nonlinear scattering effect of the optical fiber, the equivalent fiber loss of the other band changes, thereby affecting the state and stability of the optical link.

[0007] The system across multiple optical multiplex sections (OMS), when the optical amplifier of the upstream OMS fails or the terminal of the link occurs, no light is transmitted to the straight communication channel of the downstream OMS, the equivalent fiber loss of the newly added part of channels of the downstream OMS changes, and the state and stability of the optical channel are affected.

[0008] Therefore, overcoming the defects of the prior art is an urgent problem to be solved in the technical field.

[0009] Content of the application

[0010] The technical problem solved by the application is that, in the prior art, when the optical amplifier of the upstream OMS fails or the terminal of the link occurs, no light is transmitted to the straight communication channel of the downstream OMS, the equivalent fiber loss of the newly added part of channels of the downstream OMS changes, and the state and stability of the optical channel are affected.

[0011] The application adopts the following technical scheme:

[0012] In a first aspect, the application provides a device for filling false wave optical power in a failure state, which comprises a false wave seed light source 1, an optical switch 2, a first optical power detection unit 3 and a control unit 4.

[0013] The output end of the optical switch 2 is connected with the signal input end of an optical amplifier 5, the first input end of the optical switch 2 is connected with the false wave seed light source 1, and the second input end of the optical switch 2 is connected on a transmission path of a true optical signal.

[0014] The first optical power detection unit 3 is arranged on the transmission path of the true optical signal.

[0015] The false wave seed light source 1 is used for generating a false optical signal.

[0016] The first optical power detection unit 3 is used for detecting the optical power of the true optical signal.

[0017] The control unit 4 is used for controlling the switching of the optical switch 2 according to the optical power of the true optical signal, so that when the true optical signal is abnormal, the output end of the optical switch 2 is switched to be conductive with the first input end of the optical switch 2, so as to transmit the false optical signal to the optical amplifier 5, thereby reducing the influence on other channels in the downstream multiplex section.

[0018] And when the true optical signal returns to normal, the output end of the optical switch 2 is switched to be conductive with the second input end of the optical switch 2, so as to transmit the true optical signal to the optical amplifier 5 for normal signal transmission.

[0019] Preferably, a second optical power detection unit 6 and a variable optical attenuator 7 are further included.

[0020] The variable optical attenuator 7 and the second optical power detection unit 6 are arranged between the false wave seed light source 1 and the first input end of the optical switch 2 in sequence.

[0021] The second optical power detection unit 6 is used for detecting the optical power of the false light signal.

[0022] The variable optical attenuator 7 is used for optical attenuation of the false light signal.

[0023] The control unit 4 is further used for recording the optical power of the true light signal as a reference optical power before the abnormality of the true light signal, and adjusting the variable optical attenuator 7 according to the optical power of the false light signal so as to keep the optical power of the false light signal consistent with the reference optical power after the abnormality of the true light signal.

[0024] Preferably, the adjustable filter 8 and the spectrum detection unit 9 are further included.

[0025] The adjustable filter 8 is arranged between the false wave seed light source 1 and the first input end of the optical switch 2.

[0026] The spectrum detection unit 9 is arranged at the output end of the optical switch 2.

[0027] The spectrum detection unit 9 is used for detecting the spectrum of the output light signal.

[0028] The adjustable filter 8 is used for filtering the outgoing light of the false wave seed light source 1 to obtain the false light signal.

[0029] The control unit 4 is further used for recording the spectrum of the output light signal as a reference spectrum before the abnormality of the true light signal, and adjusting the adjustable filter 8 so as to keep the spectrum of the output light signal obtained after the false light signal is amplified by the optical amplifier 5 consistent with the reference spectrum after the abnormality of the true light signal.

[0030] Preferably, the first optical power detection unit 3 includes a coupler 31 and a light detector 32.

[0031] The input end and the first output end of the coupler 31 are coupled on the transmission path of the true light signal.

[0032] The second output end of the coupler 31 is connected with the light detector 32.

[0033] The coupler 31 is used for splitting light from the true light signal to obtain detection light.

[0034] The light detector 32 is used for detecting the optical power of the detection light so as to calculate the optical power of the true light signal according to the optical power of the detection light.

[0035] Preferably, the false wave seed light source 1 is a flat spectrum seed light source.

[0036] Preferably, the spectrum range of the false wave seed light source 1 covers the working wavelength range of the optical amplifier 5.

[0037] In a second aspect, the present application provides an optical wavelength division multiplexing transmission system, comprising a wavelength division demultiplexer 10, a plurality of optical amplifiers 5, a wavelength division multiplexer 11;

[0038] The output end of the wavelength division demultiplexer 10 is connected to the corresponding optical amplifier 5, and the output end of each optical amplifier 5 is connected to the input end of the wavelength division multiplexer 11;

[0039] The device for filling false wave optical power in fault state at a fast rate according to any one of claims 1-6 is arranged at the position of at least one optical amplifier 5.

[0040] Preferably, the system is used for transmitting C-band signal light and L-band signal light; and the plurality of optical amplifiers 5 comprises a C-band optical amplifier 51 and an L-band optical amplifier 52.

[0041] Preferably, the first false wave optical power filling device is arranged at the position of the C-band optical amplifier 51, and / or the second false wave optical power filling device is arranged at the position of the L-band optical amplifier 52.

[0042] The first false wave optical power filling device and the second false wave optical power filling device are both the device for filling false wave optical power in fault state at a fast rate according to any one of claims 1-6, the false light signal in the first false wave optical power filling device is C-band, and the false light signal in the second false wave optical power filling device is L-band.

[0043] Preferably, when the system comprises a multi-span cascaded optical transmission system obtained by cascading a plurality of optical amplifiers 5, and the true light signal of the multi-span cascaded optical transmission system is abnormal, the first optical amplifier 5 receiving the abnormal true light signal in the multi-span cascaded optical transmission system is switched to a constant power mode, and one or more levels of optical amplifiers 5 after the first optical amplifier 5 are improved to ensure that the power of the output light signal of the multi-span cascaded optical transmission system is unchanged.

[0044] Compared with the prior art, the present application has the beneficial effects that: by adding a false wave seed light source and an optical switch at the inlet of the optical amplifier, when the input signal of the optical amplifier is normal, the optical switch is normally turned on to the optical amplifier; when no input light is detected, the optical switch switches the input of the optical amplifier to the false wave seed light source, so that when the signal light is abnormal, the optical amplifier can work normally, and the output optical power and flatness are basically consistent with those when the normal service is turned on, thereby minimizing the influence on other wave bands and downstream optical transmission links. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0046] Fig. 1 is a structural schematic diagram of a first fault state fast false wave optical power filling device provided by the embodiment of the present application;

[0047] Fig. 2 is a structural schematic diagram of a second fault state fast false wave optical power filling device provided by the embodiment of the present application;

[0048] Fig. 3 is a structural schematic diagram of a third fault state fast false wave optical power filling device provided by the embodiment of the present application;

[0049] Fig. 4 is a structural schematic diagram of a fourth fault state fast false wave optical power filling device provided by the embodiment of the present application;

[0050] Fig. 5 is a structural schematic diagram of a fifth fault state fast false wave optical power filling device provided by the embodiment of the present application;

[0051] Fig. 6 is a structural schematic diagram of an optical wavelength division multiplexing transmission system provided by the embodiment of the present application;

[0052] Fig. 7 is a structural schematic diagram of a part of an optical wavelength division multiplexing transmission system provided by the embodiment of the present application;

[0053] Fig. 8 is a structural schematic diagram of a part of another optical wavelength division multiplexing transmission system provided by the embodiment of the present application;

[0054] Fig. 9 is a structural schematic diagram of a single ROADM site in an optical transmission system of a prior art provided by the embodiment of the present application;

[0055] Fig. 10 is a flow schematic diagram of a fault state fast false wave optical power filling method provided by the embodiment of the present application;

[0056] Fig. 11 is a flow schematic diagram of a second fault state fast false wave optical power filling method provided by the embodiment of the present application;

[0057] Fig. 12 is a flow schematic diagram of a third fault state fast false wave optical power filling method provided by the embodiment of the present application;

[0058] Fig. 13 is a flow schematic diagram of a fourth fault state fast false wave optical power filling method provided by the embodiment of the present application;

[0059] Fig. 14 is a flow schematic diagram of a step 401c provided by the embodiment of the present application;

[0060] Fig. 15 is a flow diagram of a fifth method for filling false-wave optical power in a failure state according to an embodiment of the present application;

[0061] Fig. 16 is a schematic diagram of an apparatus for filling false-wave optical power in a failure state according to an embodiment of the present application.

[0062] In all the drawings, the same reference numerals are used to represent the same elements or structures, wherein:

[0063] 1, false-wave seed light source; 2, optical switch; 3, first optical power detection unit; 31, coupler; 32, optical detector; 4, control unit; 5, optical amplifier; 51, C-band optical amplifier; 52, L-band optical amplifier; 6, second optical power detection unit; 7, variable optical attenuator; 8, tunable filter; 9, optical spectrum detection unit; 10, wavelength division demultiplexer; 11, wavelength division multiplexer. DETAILED DESCRIPTION

[0064] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application, and are not intended to limit the present application.

[0065] Unless otherwise required by context, the term "comprises" in the specification and claims is to be construed as open-ended, i.e., as "comprises but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to mean that a particular feature, structure, material or characteristic included in at least one embodiment or example of the present disclosure. The illustrative representation of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or characteristics described can be included in any one or more embodiments or examples in any appropriate manner, i.e., although they are carried in the embodiments or examples of the above terms due to the order of appearance and location, they are not limited to being carried by one embodiment or example in a combined manner.

[0066] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present disclosure and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0067] In the description of the present application, the terms "first", "second", "third", etc. are used only to describe the purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can be explicitly or implicitly included one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality of" is two or more. In addition, for example, in the description, the same type of nouns can also be described as two independent individuals by adding "A", "B" at the end, in which case the features defined as "A", "B" are only used for the purpose of distinguishing the same type of individual description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0068] In describing some embodiments, "coupled", "coupling" and "connected" and their derivatives can be used. For example, the term "connected" can be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. For another example, the term "coupling" can be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the term "connected" or "coupled" can also refer to two or more components that do not have direct contact with each other, but still cooperate or interact with each other, such as "optical coupling", "wireless connection", etc. The embodiments disclosed herein are not necessarily limited to the content of the present application.

[0069] In the description of the present application, the expression "A and / or B" (where A and B are used to represent specific feature content) includes the following three combinations: only A, only B, and the combination of A and B.

[0070] In the present application, "about", "approximately" or "approximately" includes the value stated and the average value within the acceptable deviation range of the specific value, wherein the acceptable deviation range is determined by considering the measurement being discussed and the error related to the measurement of the specific quantity (i.e. the limitation of the measurement system) by the ordinary skilled person in the art.

[0071] In the present application, the words "for example" or "such as" are used to represent an example, illustration or description. Any embodiment or design scheme described as "for example" or "such as" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "for example" or "such as" is intended to present the relevant concept in a specific manner.

[0072] It should be noted that, in the embodiments of the present application, "at" or "when" can be at the moment when a certain condition occurs, or within a period of time after the occurrence of a certain condition, and the embodiments of the present application do not make specific limitations. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as there is no conflict.

[0074] Embodiment 1:

[0075] In a long-distance dense wavelength division multiplexing optical transmission system, due to the failure of part of the optical channel or equipment, the state of stimulated Raman scattering (SRS) in the optical fiber changes, and the optical power of other optical channels changes, causing service damage.

[0076] In the prior art, a reconfigurable optical add-drop multiplexer (ROADM) site is often filled with dummy waves, and a wavelength selective switch (WSS) is used to reconfigure the dummy wave filling to replace the failed channel into the downstream optical fiber, so as to ensure that the optical signal is not dropped and the channel is affected as little as possible.

[0077] However, the dummy wave filling of this scheme occurs at the ROADM site with service up and down, and cannot cope with the situation where the optical amplification site fails in the long-distance transmission link. Moreover, the adjustment speed of the WSS is too slow, resulting in a long recovery time of the affected channel. Therefore, there is an urgent need for a scheme that can minimize the impact on the optical signal not dropped channel when a fault occurs in a long-distance dense wavelength division multiplexing optical transmission system.

[0078] Embodiment 1 of the present application provides a device for fast dummy wave optical power filling in a fault state, as shown in FIG. 1, which comprises a dummy wave seed light source 1, an optical switch 2, a first optical power detection unit 3 and a control unit 4.

[0079] The output end of the optical switch 2 is connected to the signal input end of the optical amplifier 5, the first input end of the optical switch 2 is connected to the dummy wave seed light source 1, and the second input end of the optical switch 2 is connected to the transmission path of the true optical signal.

[0080] The first optical power detection unit 3 is arranged on the transmission path of the true optical signal; the false wave seed light source 1 is used to generate a false optical signal; the first optical power detection unit 3 is used to detect the optical power of the true optical signal; and the control unit 4 is used to control the switching of the optical switch 2 according to the optical power of the true optical signal, so that when the true optical signal is abnormal, the output end of the optical switch 2 is switched to be conductive with the first input end of the optical switch 2, so as to transmit the false optical signal to the optical amplifier 5, so as to reduce the influence on other channels in the downstream multiplexing section; and when the true optical signal returns to normal, the output end of the optical switch 2 is switched to be conductive with the second input end of the optical switch 2, so as to transmit the true optical signal to the optical amplifier 5 for normal signal transmission.

[0081] The true optical signal can be understood as a normal optical signal used for signal transmission, and the false optical signal can be understood as an optical signal not used for signal transmission, but generated to ensure that the light of other channels in the downstream multiplexing section is not affected. The false wave seed light source 1 can be a laser or a wide-spectrum light source in actual application scenarios, such as an erbium-doped fiber-based wide-spectrum light source or a semiconductor optical amplifier-based wide-spectrum light source. The true optical signal abnormality can be understood as no true optical signal input. In actual use, the true optical signal abnormality is that the optical power detected by the first optical power detection unit 3 is less than the preset optical power, that is, the optical power of the true optical signal detected by the first optical power detection unit 3 is less than the preset optical power, and the preset optical power is obtained by demand analysis by those skilled in the art.

[0082] The embodiment adds the false wave seed light source 1 and the optical switch 2 at the inlet of the optical amplifier 5. When the input signal of the optical amplifier 5 is normal, the optical switch 2 is normally conductive to the optical amplifier 5. When no input light is detected, the optical switch 2 switches the input of the optical amplifier 5 to the false wave seed light source 1, so that the optical amplifier 5 can work normally, and the output optical power and flatness are basically consistent with those when the normal service is conductive, thereby minimizing the influence on other wave bands and downstream optical transmission links.

[0083] In actual application scenarios, as shown in FIG. 2, the first optical power detection unit 3 includes a coupler 31 and an optical detector 32; the input end and the first output end of the coupler 31 are coupled on the transmission path of the true optical signal; the second output end of the coupler 31 is connected with the optical detector 32; the coupler 31 is used to split the true optical signal to obtain a detection light; and the optical detector 32 is used to detect the optical power of the detection light, so as to calculate the optical power of the true optical signal according to the optical power of the detection light.

[0084] The control unit 4 has no coupling relationship with each device in the optical path, but from the control level, the control unit 4 has the function of controlling each device or receiving the data of each device. In FIG. 1 and FIG. 2, this function is represented in the form of a dashed line. In order to make the structure of the device clearer, the control unit 4 will not be presented in the subsequent drawings, but it does not mean that the control unit 4 does not exist.

[0085] In a preferred embodiment, as shown in FIG. 3, the device further comprises a second optical power detection unit 6 and a variable optical attenuator 7; the variable optical attenuator 7 and the second optical power detection unit 6 are sequentially arranged between the false wave seed light source 1 and the first input end of the optical switch 2; the second optical power detection unit 6 is used for detecting the optical power of the false light signal; the variable optical attenuator 7 is used for optical attenuation of the false light signal; the control unit 4 is further used for recording the optical power of the true light signal as a reference optical power before the abnormality of the true light signal, and adjusting the variable optical attenuator 7 according to the optical power of the false light signal after the abnormality of the true light signal, so that the optical power of the false light signal is consistent with the reference optical power.

[0086] The second optical power detection unit 6 and the first optical power detection unit 3 are based on the same concept and will not be described here.

[0087] The adjustment of the variable optical attenuator 7 is to adjust the difference between the optical power of the false light signal and the reference optical power to be less than a first preset difference, that is, to adjust the variable optical attenuator 7 until the difference between the optical power of the false light signal detected by the second optical power detection unit 6 and the reference optical power is less than the first preset difference, wherein the first preset difference is obtained by experience analysis by those skilled in the art.

[0088] In an optional embodiment, as shown in FIG. 4, the device further comprises an adjustable filter 8 and a spectrum detection unit 9; the spectrum detection unit 9 is a spectrum detector.

[0089] The adjustable filter 8 is arranged between the false wave seed light source 1 and the first input end of the optical switch 2; the spectrum detection unit 9 is arranged at the output end of the optical switch 2; the spectrum detection unit 9 is used for detecting the spectrum of the output light signal; the adjustable filter 8 is used for filtering the outgoing light of the false wave seed light source 1 to obtain the false light signal; the control unit 4 is further used for recording the optical power of the output light signal as a reference spectrum before the abnormality of the true light signal, and adjusting the adjustable filter 8 after the abnormality of the true light signal, so that the spectrum of the output light signal obtained after the false light signal is amplified by the optical amplifier 5 is consistent with the reference spectrum.

[0090] Wherein, since the tunable filter 8 can adjust the attenuation of different wavelengths while flexibly configuring the spectrum, the tunable filter 8 can be used alone or together with the variable optical attenuator 7, and FIG. 4 only shows the device structure schematic diagram when the tunable filter 8 is used alone, but it should be noted that the implementation mode of connecting the variable optical attenuator 7 between the tunable filter 8 and the false wave seed light source 1 or between the tunable filter 8 and the second optical power detection unit 6 is also feasible, at this time, the variable optical attenuator 7 can be used to adjust the optical power of the false light signal, and the tunable filter 8 can be used to adjust the spectrum of the false light signal.

[0091] And since the tunable filter 8 also has the function of adjusting the attenuation, as shown in FIG. 4, it can be used in cooperation with the second optical power detection unit 6, that is, the spectrum of the false light signal is adjusted according to the spectrum detection unit 9, and the optical power of the false light signal is adjusted according to the second optical power detection unit 6.

[0092] There is also an optional implementation mode that does not set the spectrum detection unit 9, as shown in FIG. 5, the tunable filter 8 is controlled by the control unit 4 to adjust the optical power of the false light signal.

[0093] In actual application scenarios, the false wave seed light source 1 is a flat spectrum seed light source. The spectrum range of the false wave seed light source 1 covers the working wavelength range of the optical amplifier 5.

[0094] Embodiment 2:

[0095] Based on embodiment 1, the embodiment also provides an optical wavelength division multiplexing transmission system, which comprises a wavelength division demultiplexer 10, a plurality of optical amplifiers 5, and a wavelength division multiplexer 11; each output end of the wavelength division demultiplexer 10 is connected to a corresponding optical amplifier 5, and the output end of each amplifier is connected to each input end of the wavelength division multiplexer 11; the device for filling false wave optical power in a fault state at a fast speed in embodiment 1 is arranged at the position of at least one optical amplifier 5.

[0096] Wherein, the specific setting positions of each device in the device for filling false wave optical power in a fault state at a fast speed have been described in detail in embodiment 1, and the following will be described with a specific optical wavelength division multiplexing transmission system as an example, and the system is used for transmitting C-band signal light and L-band signal light; the plurality of optical amplifiers 5 comprises a C-band optical amplifier 51 and an L-band optical amplifier 52.

[0097] The first false wave optical power filling device and the second false wave optical power filling device are both the device for false state fast false wave optical power filling described in Embodiment 1, the false optical signal in the first false wave optical power filling device is C-band, and the false optical signal in the second false wave optical power filling device is L-band.

[0098] For example, if the system comprises both the first false wave optical power filling device and the second false wave optical power filling device, the specific structure of the optical wavelength division multiplexing transmission system is shown in Fig. 6, wherein Fig. 6 is only one optional embodiment, and any one of the embodiments in Embodiment 1 can be applied to the wavelength division multiplexing transmission system in actual use.

[0099] In actual use, there is also an optional embodiment that when the system contains a multi-span cascaded optical transmission system obtained by cascading a plurality of optical amplifiers 5, and the true optical signal of the multi-span cascaded optical transmission system is abnormal, the first optical amplifier 5 receiving the abnormal true optical signal in the multi-span cascaded optical transmission system is switched to a constant power mode, and one or more optical amplifiers 5 after the first optical amplifier 5 are improved to ensure that the power of the output optical signal of the multi-span cascaded optical transmission system is unchanged. Since the flat output power of a common optical amplifier 5 is low when there is no light input, the input optical power of the rear stage is lower than that in normal operation, and it is generally necessary to increase the gain of the rear stage optical amplifier 5 to ensure that the output is consistent with that in normal operation.

[0100] As shown in Fig. 7, which is a structure diagram of a certain multiplexing section in the optical wavelength division multiplexing transmission system, the multiplexing section is obtained by cascading a plurality of optical amplifiers 5 in sequence, and two optical amplifiers 5 are used in Fig. 7, and when operating normally, the optical amplifiers 5 operate in a constant gain mode, and the gain of each optical amplifier 5 compensates for the loss of the optical fiber span. When a fault occurs, as shown in Fig. 8, when the first optical amplifier input light is abnormal, the first optical amplifier inputting abnormal light is switched to a constant power mode. And since the flat output power of a common optical amplifier is low when there is no light input, the input optical power of the rear stage is lower than that in normal operation, and it is generally necessary to increase the gain of the rear stage optical amplifier to ensure that the output is consistent with that in normal operation.

[0101] Embodiment 3:

[0102] Based on the method described in Embodiment 1, the specific application scene is combined, and the implementation process in the characteristic scene of the application is described by means of technical description in the related scene.

[0103] As shown in Fig. 1-5, an optical switch 2 is inserted at the input end of the optical amplifier 5, and a first optical power detection unit 3 and a second optical power detection unit 6 are respectively arranged on two optional light paths of the optical switch 2, wherein the first optical power detection unit 3 is connected to the input light of the optical amplifier 5, and the second optical power detection unit 6 is connected to the false wave seed light source 1. The false wave seed light source 1 is a flat wide spectrum seed light source, and the spectral range thereof covers the working wavelength range of the amplifier. When the first optical power detection unit 3 shows that the input light is normal, the optical switch 2 is in the state of 2 paths, and the optical amplifier 5 works normally; when the first optical power detection unit 3 shows that the input light, i.e. the true light signal, is abnormal, the control system of the optical switch 2 automatically switches the optical switch 2 to 1 path, and the false wave seed light source 1 provides the input light for the optical amplifier 5, so as to ensure that the output optical power and spectral flatness of the optical amplifier 5 are consistent with those in the normal working state. When the first optical power detection unit 3 detects that the true light signal returns to normal, the control unit 4 automatically switches the optical switch 2 back to 2 paths, so that the service is normally conducted.

[0104] In a dual-band system, as shown in Fig. 6, the input light of the amplifiers of two bands located in the same optical fiber is separated into two paths by a wavelength division demultiplexer 10, and the input light of the C-band optical amplifier 51 and the input light of the L-band optical amplifier 52 are obtained. The device as described in any one of Figs. 1-5 is added before the amplifier of each band, when the input light of the C-band is abnormal, the control unit 4 switches the optical switch 2 to the C-band false wave seed light source located in the second optical power detection unit 6 according to the detection of the abnormality by the first optical power detection unit 3, so as to ensure that the output optical power and spectral flatness of the C-band optical amplifier 51 are consistent with those in the normal working state. When the first optical power detection unit 3 returns to normal, the control unit 4 automatically switches the optical switch 2 back to 2 paths, so that the C-band service is normally conducted. The same is true for the L-band optical path, and the control of the optical switch 2 of the C-band and the control of the optical switch 2 of the L-band work independently, and each of them deals with the abnormality of the input light of the corresponding band. The output of the C-band optical amplifier 51 and the output of the L-band optical amplifier 52 are combined through a wavelength division multiplexer 11, and the output of the optical amplifier 5 is injected into the same optical fiber. Since the input light of any one band occurs failure, the optical switch 2 of the two bands can be switched to the input of the false wave seed light source 1, so as to keep the output optical power and spectral flatness of the corresponding band unchanged, and the state of the optical fiber Raman nonlinear effect in the common output optical fiber does not change.

[0105] Moreover, in order to ensure that the power of the false wave seed light source 1 injected into the optical amplifier 5 is consistent with the power of the signal light in the normal working state when the optical switch 2 is switched, a variable optical attenuator 7 is added behind the false wave seed light source 1, as shown in Fig. 3. When working normally, the optical power of the second optical power detection unit 6 and the optical power of the first optical power detection unit 3 are adjusted to be consistent by adjusting the variable optical attenuator 7, and when the optical switch 2 is switched due to failure, the gain of the optical amplifier 5 does not need to be adjusted, so as to ensure that the output power of the optical amplifier 5 does not change.

[0106] In order to ensure that the spectrum of the false wave seed light source 1 injected into the optical amplifier 5 is consistent with the spectrum of the signal light when the optical switch 2 switches, an adjustable filter 8, for example, a wavelength selective switch (WSS for short) is added behind the false wave seed light source 1, as shown in FIG. 4. The adjustable filter 8 can adjust the attenuation of different wavelengths while flexibly configuring the spectrum. When working normally, the spectrum of the false wave seed light source 1 is adjusted to be consistent with the spectrum of the signal light by configuring the adjustable filter 8, and when the optical switch 2 switches due to a fault, the output power and the spectral density of the optical amplifier 5 can be ensured not to change.

[0107] The adjustable filter 8 in FIG. 4 can be configured by a controller of the optical transmission system, and can also be configured by detecting the spectrum information by a spectrum detection unit 9 at the output of the optical amplifier 5, as shown in FIG. 5.

[0108] In order to cope with the abnormal input of the optical amplifier 5, the false wave seed light source 1 is added in the embodiment to replace it. That is, the optical switch 2 is used to add a backup input false wave seed light source 1 to each optical amplifier 5, and when the input power of the optical amplifier 5 is abnormal, the input of the optical amplifier 5 is switched to the backup false wave seed light source 1, so that the switching speed is fast, and the output power of the optical amplifier 5 can be ensured to be stable when an abnormality occurs. Therefore, the influence on other wavelength services in the same fiber, especially the signal of another wavelength band and the downstream optical transmission link, is minimized.

[0109] In another optional embodiment, in a multi-span cascaded optical transmission system, the optical amplifiers 5 working normally work in a constant gain mode, and the gain of each amplifier compensates for the loss of the optical fiber span. When a fault occurs, the first input light abnormal amplifier can also be switched to a constant power mode. Since the flat output power of a common optical amplifier 5 is low when there is no light input, the input power of the subsequent stage is lower than that when working normally, and the gain of the subsequent stage amplifier needs to be increased to ensure that the output is consistent with that when working normally, as shown in FIGS. 7 and 8.

[0110] Embodiment 4:

[0111] The SRS process can be regarded as a scattering process of material molecules on photons, or a mutual resonance process of light (such as photons) and matter (such as molecules); in a long-distance dense wavelength division multiplexing optical transmission system, due to partial optical channel or device faults, the SRS effect state in the optical fiber changes, and the optical power of other optical channels changes, causing service damage. Specifically, there are the following two cases:

[0112] (1) Single-band fault of a dual-band optical transmission system.

[0113] Single-band failure will affect the optical power stability of another band. The dual-band optical transmission system includes two independent gain-controlled optical amplification links, such as C-band and L-band, or C++ band and L++ band, etc. The embodiments of the present application take C-band and L-band, i.e. C+L optical transmission system as an example for illustration, and other band combination modes are the same.

[0114] In the dual-band optical transmission system, each optical power amplification node includes amplifiers for amplifying optical power of two bands respectively, i.e. C-band optical amplifier and L-band optical amplifier. The optical amplifiers of different bands in the same optical power amplification node can be independently packaged or co-packaged.

[0115] After the optical of two bands is amplified by the optical amplifiers and then combined into the same optical fiber, the optical of two bands will have optical power transfer from short wavelength to long wavelength due to the Raman nonlinear scattering effect of the optical fiber, which is equivalent to that the short wavelength has greater equivalent fiber loss than the long wavelength. In actual operation, due to link or device failure, the optical amplifier of a single band may be closed due to input light loss, and then in the next optical fiber span, due to the change of the state of the Raman nonlinear scattering effect of the optical fiber, the equivalent fiber loss of another band changes, thereby affecting the state and stability of the optical link.

[0116] (2) System across multiple optical multiplex sections (Optical Multiplex Section, referred to as: OMS), when the optical amplifier of the upstream OMS fails or the link has a terminal, and there is no light in the straight channel transmitted to the downstream OMS, the equivalent fiber loss of the part of channels newly added by the downstream OMS changes, affecting the state and stability of the optical channel.

[0117] In order to solve the above problems, the industry often uses the method of false wave filling in reconfigurable optical add-drop multiplexer (ROADM) site, and the WSS reconfigures the false wave filling to replace the failed channel to enter the downstream optical fiber. As shown in FIG. 9, the general basic composition of a ROADM site mainly includes an optical amplifier (Optical Amplifier, referred to as: OA), a WSS, a network node interface (Network Node Interface, referred to as: NNI), a user network interface (User Network Interface, referred to as: UNI), a wavelength division demultiplexer (De-Multiplexer, referred to as: Demux, or referred to as: DMux) and a multiplexer (Multiplexer, referred to as: Mux). Specifically:

[0118] The OA can include a pre-optical amplifier (such as OA1 in FIG. 9) and a post-optical amplifier (such as OA2 in FIG. 9); the pre-optical amplifier is used to enhance the intensity of the optical signal received from the optical fiber line, and the post-optical amplifier is used to enhance the intensity of the combined optical signal for long-distance transmission in the optical fiber.

[0119] The WSS is the core component of the ROADM site, which is used to select, switch and combine optical signals of different wavelengths; by selecting any set of wavelengths from any input port and guiding them to the output port, flexible scheduling of optical signals is achieved. Among them, the WSS can be used in combination with an optical switch, which is used to switch and route signals on the optical signal transmission path; the combination of the two can achieve more complex network configurations.

[0120] The NNI is used to interconnect dense wavelength division multiplexing (Dense Wavelength Division Multiplexing, referred to as: DWDM) signals from or to multiple transmission directions, and the DWDM signals are switched between transmission directions in wavelength granularity.

[0121] The UNI is used to download signals with the destination being the node, and upload signals from the node, to realize the connection between the user equipment and the ROADM site.

[0122] The Demux is used to separate optical signals of different wavelengths from the optical fiber: the Mux is used to combine optical signals of multiple wavelengths into an optical fiber.

[0123] In a long-distance dense wavelength division multiplexing optical transmission system, a ROADM site usually adopts a mesh (Mesh) structure, and through the interconnection of multiple ROADM sites, a flexible and expandable optical network is formed. Among them, the input signal first enters the ROADM site through the NNI interface; the input signal first passes through the pre-optical amplifier, and the signal enhanced in intensity by the pre-optical amplifier is wavelength-separated by the Demux; the separated optical signal is selected and combined by the WSS, and the routing and wavelength of the optical signal are dynamically adjusted according to the network configuration and service demand; the optical signal processed by the WSS is combined by the Mux, and the combined optical signal is further enhanced in signal intensity by the post-optical amplifier; finally, it is output to the user equipment through the UNI interface, or forwarded to other ROADM sites or transmission links through the NNI interface.

[0124] In order to simulate optical signals at specific wavelengths to maintain the stability of the link or for fault detection, dummy wave filling is usually performed by WSS at the ROADM site with traffic. However, this method of dummy wave filling is mainly applicable to wavelength management within the ROADM site, and it cannot solve the problem of failure of optical amplifier sites in long-distance transmission links; because dummy wave filling does not involve amplification or regeneration of optical signals, it cannot compensate for the attenuation of optical signals caused by failure of optical amplifier sites.

[0125] In addition, WSS is limited by its working principle and mechanical structure, and when wavelength configuration or adjustment is needed, WSS needs a certain amount of time to complete the corresponding operation, but this situation is very likely to cause the affected channels to be unable to recover for a period of time, seriously affecting the real-time performance and reliability of the network, especially in time-sensitive application scenarios.

[0126] In order to solve the above problems, the embodiment further provides a method for fast dummy wave optical power filling in a fault state based on the embodiment 1, the method is executed by the control unit 4 in the embodiment 1, as shown in Figure 10, the method for fast dummy wave optical power filling in a fault state comprises:

[0127] Step 10: In the optical transmission link, the input light source (i.e. true optical signal) of each optical amplifier 5 enters the optical switch control unit; wherein the optical switch 2 and the control unit 4 are collectively referred to as the optical switch control unit, specifically: the input light source enters an input end of the optical switch 2, and the optical switch 2 performs optical path switching under the control of the control unit 4.

[0128] Step 20: When the optical power of the input light source is within the normal range (i.e. the true optical signal is normal), the optical switch control unit conducts the input light source to the optical amplifier 5.

[0129] Wherein, the normal range corresponding to the optical power of the input light source of each optical amplifier 5 is selected by a person skilled in the art according to the specific use scenario, which is not limited here.

[0130] In order to detect the optical power of the input light source, the optical switch control unit can include an optical power detector (i.e. a first optical power detection unit 3).

[0131] Step 30: When the optical power of the input light source is not within the normal range, the optical switch control unit conducts the dummy wave seed light source 1 to the optical amplifier 5 to use the dummy wave seed light source 1 to realize optical power filling of the optical amplifier 5.

[0132] The false wave seed light source 1 is a flat wide spectrum seed light source, and a spectral range of the false wave seed light source 1 covers a working wavelength range of the optical amplifier 5. The working wavelength range of each optical amplifier 5 is determined by a person skilled in the art according to a specific use scenario.

[0133] The embodiment of the present application adds the false wave seed light source 1 and the optical switch control unit at the entrance of each optical amplifier 5 of the optical transmission link, and the optical switch control unit adds the false wave seed light source 1 as a backup light source for each optical amplifier 5.

[0134] Specifically, in the embodiment of the present application, when the input signal of the optical amplifier 5 is normal, the optical switch control unit normally turns on the input light source to the optical amplifier 5; when the optical switch detects abnormal input optical power and / or no input light, the optical switch control unit quickly switches the input light source of the optical amplifier 5 to the false wave seed light source 1, and turns on the backup input false wave seed light source 1 to the optical amplifier 5, so that the optical amplifier 5 can work normally, and the output optical power and flatness are basically consistent with those when the normal service is turned on, thereby minimizing the influence on another wave band and the downstream optical transmission link. The switching speed of the optical switch control unit is selected by a person skilled in the art according to the specific use scenario and the performance requirement of the optical transmission link, which is not limited herein. In order to selectively turn on the input light source or the false wave seed light source 1 to the optical amplifier 5, the optical switch control unit can include an optical fiber line automatic switching protection device (Optical Fiber Line Auto Switch Protection Equipment, referred to as OLP for short); based on the optical path structure proposed in the embodiment of the present application, since the switching speed of the OLP is usually within tens of milliseconds, the backup input false wave seed light source 1 can be quickly switched when the optical fiber line fails, thereby maintaining the continuity and stability of communication.

[0135] As shown in FIG. 1, when the first optical power detection unit 3 shows that the input light is normal, the state of the optical switch is located at 2-way, and the optical amplifier 5 works normally; when the first optical power detection unit 3 shows that the input light is abnormal, the control system of the optical switch automatically switches the optical switch to 2-way, and the false wave seed light source 1 provides input for the optical amplifier 5. When the optical switch control unit turns on the false wave seed light source 1 to the optical amplifier 5, and the optical power of the input light source recovers to the normal range, the optical switch control unit turns on the input light source recovering to the normal range to the optical amplifier 5; that is, when the first optical power detection unit 3 recovers to normal, the optical switch control system automatically switches the optical switch back to 2-way, so that the service is normally turned on.

[0136] The application makes the input light source of each optical amplifier 5 enter the optical switch control unit in the optical transmission link; when the optical power of the input light source is in the normal range, the input light source is conducted to the optical amplifier 5 through the optical switch control unit; when the optical power of the input light source is not in the normal range, the false wave seed light source 1 is conducted to the optical amplifier 5 through the optical switch control unit, so as to use the false wave seed light source 1 as the backup input of the input light source of the optical amplifier 5, realize the optical power filling of the optical amplifier 5, ensure that the output light of the optical amplifier 5 keeps stable when an abnormality occurs, and thus realize the minimization of the influence of the other wavelength services, especially the signals of another waveband and the downstream optical transmission link, on the common fiber, solve the problem that the prior art cannot cope with the failure of the optical amplification site in the long-distance transmission link, and the problem of slow WSS adjustment speed.

[0137] Embodiment 5:

[0138] In view of the problem caused by the single-band failure of the dual-band optical transmission system in the prior art introduced in Embodiment 4, the embodiment of the application provides a further preferred scheme of Embodiment 4. As shown in FIG. 11, the method of the failure-state fast false wave optical power filling further comprises:

[0139] In step 401a, in the optical transmission link, the original input light sources of two wavebands located in the same optical fiber enter the wavelength division demultiplexer 10; the wavelength division demultiplexer 10 demultiplexes the original input light sources into first waveband input light sources and second waveband input light sources.

[0140] The original input light sources of two wavebands located in the same optical fiber refer to the input light sources of two different wavebands in the common fiber; as shown in FIG. 6, in the optical transmission link of the dual-band optical transmission system, the original input light sources are dual-band input light sources (i.e., C waveband and L waveband), which can be amplified by two optical amplifiers 5 (i.e., a C waveband optical amplifier 51 and an L waveband optical amplifier 52, the C waveband optical amplifier 51 is also referred to as a first optical amplifier in subsequent embodiments, and the L waveband optical amplifier 52 is also referred to as a second optical amplifier in subsequent embodiments) after being demultiplexed by the wavelength division demultiplexer 10.

[0141] For example, in an optical communication network, the C+L topology model is a common network structure; “C” represents a network topology of the wavelength range type C waveband, “L” represents a network topology of the wavelength range type L waveband, the C+L topology model is composed of the network topology of the C waveband and the network topology of the L waveband; the basic component structures of the network topology of the C waveband and the network topology of the L waveband are the same.

[0142] The C+L optical transmission system is based on a C+L topology model. In the optical transmission link of the C+L optical transmission system, the original input light source in the C+L band of the same optical fiber enters the wavelength division demultiplexer 10, and the wavelength division demultiplexer 10 decomposes the original input light source in the C+L band into a C-band input light source and an L-band input light source.

[0143] In step 402a, the first waveband input light source enters the first optical switch control unit (i.e. the optical switch 2 and the control unit 4 in the fault state fast false wave optical power filling device at the position of the C-band optical amplifier 51); and the second waveband input light source enters the second optical switch control unit (i.e. the optical switch 2 and the control unit 4 in the fault state fast false wave optical power filling device at the position of the L-band optical amplifier 52).

[0144] For example, the C-band input light source enters the corresponding first optical switch control unit of the C-band, and the L-band input light source enters the corresponding second optical switch control unit of the L-band.

[0145] In step 403a, when the optical power of the first waveband input light source is within the first waveband normal range, the first optical switch control unit conducts the first waveband input light source to the first optical amplifier; and when the optical power of the first waveband input light source is not within the first waveband normal range, the first optical switch control unit conducts the first waveband false wave seed light source to the first optical amplifier.

[0146] The first optical amplifier is an optical amplifier 5 for amplifying the signal light of the first waveband; and the first normal range corresponding to the optical power of the input light source of each first optical amplifier is selected by a person skilled in the art according to the specific use scenario, which is not limited herein.

[0147] For example, when the optical power of the C-band input light source is within the C-band normal range, the first optical switch control unit conducts the C-band input light source to the C-band optical amplifier 51; and when the optical power of the C-band input light source is not within the C-band normal range, the first optical switch control unit conducts the C-band false wave seed light source to the C-band optical amplifier 51.

[0148] In step 404a, and / or, when the optical power of the second waveband input light source is within the second waveband normal range, the second optical switch control unit conducts the second waveband input light source to the second optical amplifier; and when the optical power of the second waveband input light source is not within the second waveband normal range, the second optical switch control unit conducts the second waveband false wave seed light source to the second optical amplifier.

[0149] The wavelength division multiplexer 11 combines the output light of the first optical amplifier and the output light of the second optical amplifier received to obtain the output light after amplification of the original input light source.

[0150] The second optical amplifier is an optical amplifier 5 for amplifying signal light of a second wavelength band; the second normal range corresponding to the optical power of the input light source of each second optical amplifier is selected by a person skilled in the art according to a specific use scenario, and is not limited herein.

[0151] For example, when the optical power of the L-band input light source is within the L-band normal range, the second optical switch control unit turns on the L-band input light source to the L-band optical amplifier 52; when the optical power of the L-band input light source is not within the L-band normal range, the second optical switch control unit turns on the L-band dummy wave seed light source to the L-band optical amplifier 52.

[0152] In an alternative embodiment, the original input light source is divided into two paths by the wavelength division demultiplexer 10, which are respectively input light of the C-band optical amplifier 51 and input light of the L-band optical amplifier 52. When the input light of the C-band is abnormal, the first optical switch control unit switches to the C-band dummy wave seed light source according to the detection of the abnormality by the first optical power detection unit 3, to ensure that the output optical power of the C-band optical amplifier 51 is consistent with that when it is working normally. When the first optical power detection unit 3 returns to normal, the first optical switch control unit automatically switches the optical switch back to two paths, so that the C-band service is normally turned on. The same applies to the L-band optical path.

[0153] In step 405a, the wavelength division multiplexer 11 combines the output light of the first optical amplifier and the output light of the second optical amplifier received to obtain the output light after amplification of the original input light source.

[0154] Since when the input light of any one wavelength band fails, the optical switches and control devices of the two wavelength bands can input through the switching of the dummy wave seed light source 1, the output optical power and spectral flatness of the wavelength band remain unchanged, the state of the fiber Raman nonlinear effect in the common output fiber does not change, so the optical power of other optical channels can be ensured not to change, and service damage can be avoided.

[0155] Embodiment 6:

[0156] The embodiment of the application is a further preferred scheme of embodiment 4. As shown in FIG. 12, it further comprises:

[0157] In step 401b, when the optical power of the input light source is not within the normal range, the optical power of the dummy wave seed light source 1 is adjusted to be consistent with the optical power of the input light source (specifically: the optical power when the input light is normal), to obtain the dummy wave seed light source 1 after optical power adjustment.

[0158] In step 402b, the light power adjusted false wave seed light source 1 is connected to the optical amplifier 5 to ensure that the output light power of the optical amplifier 5 does not change when the light power filling is performed.

[0159] In order to ensure that the light power of the false wave seed light source 1 injected into the optical amplifier 5 is consistent with the light power of the signal light when the optical switch control unit performs optical switch switching, as shown in FIG. 3, the embodiment of the present application adds a variable optical attenuator 7 after the false wave seed light source 1. When working normally, the light power of the second light power detection unit 6 is adjusted to be consistent with the light power of the first light power detection unit 3 by adjusting the variable optical attenuator 7. When the optical switch switching is performed when a fault occurs, the gain of the optical amplifier 5 does not need to be adjusted, and the light power of the output light of the optical amplifier 5 does not change.

[0160] Embodiment 7:

[0161] The embodiment of the present application is a further preferred scheme of embodiment 4. As shown in FIG. 13, it further includes:

[0162] In step 401c, when the light power of the input light source is not within the normal range, the spectrum of the false wave seed light source 1 is adjusted to be consistent with the spectrum of the input light source (specifically, the spectrum when the input light is normal), to obtain the spectrum adjusted false wave seed light source 1.

[0163] The tunable filter 8 can be configured by a controller of the optical transmission system.

[0164] In step 402c, the spectrum adjusted false wave seed light source 1 is connected to the optical amplifier 5 to ensure that the output light power and spectral density of the optical amplifier 5 do not change when the light power filling is performed.

[0165] In order to ensure that the spectrum distribution of the false wave seed light source 1 injected into the optical amplifier 5 is consistent with the spectrum distribution of the signal light when the optical switch control unit performs optical switch switching, as shown in FIG. 5, a tunable filter 8, for example, a WSS, is added after the false wave seed light source 1. The tunable filter 8 can adjust the attenuation of different wavelengths while flexibly configuring the spectrum. When working normally, the spectrum of the false wave seed light source 1 is adjusted to be consistent with the signal spectrum by configuring the tunable filter 8. When the optical switch switching is performed when a fault occurs, the output light power and spectral density of the optical amplifier 5 do not change.

[0166] In an optional embodiment, as shown in FIG. 14, the step 401c includes:

[0167] Step 4011: After the false wave seed light source 1 is connected to the optical amplifier 5, the false wave amplified output light is obtained.

[0168] Step 4012: detecting the spectrum of the false wave amplified output light to obtain original spectrum information.

[0169] Step 4013: configuring the spectrum of the false wave seed light source 1 corresponding to the optical amplifier 5 based on the original spectrum information, so that the spectrum of the false wave seed light source 1 after spectrum adjustment is consistent with the spectrum of the input light source.

[0170] As shown in FIG. 4, the tunable filter 8 can also be configured by setting a spectrum detection device (i.e. spectrum detection unit 9) at the output end of the optical amplifier 5, detecting the original spectrum information by the spectrum detection device, and then configuring accordingly.

[0171] Embodiment 8:

[0172] In a long-distance transmission link, when multiple multiplexing sections are cascaded, the abnormality of upstream optical power often causes serious impact on the service of downstream multiplexing sections, greatly reducing the stability and reliability of the entire optical transmission system.

[0173] In order to solve this problem, a false wave seed light source 1 is added in front of each optical amplifier 5 for replacement. And the embodiment of the present application provides a further preferred scheme on the basis of the above-mentioned embodiments. As shown in FIG. 15, it further comprises:

[0174] In step 501, when at least one of the cascaded optical amplifiers 5 fails, for the optical amplifier 5 located at the most front end of the optical transmission link among the failed optical amplifiers 5, the working mode of the most front-end optical amplifier 5 is switched from the constant gain mode to the constant power mode.

[0175] In the optical transmission link as shown in FIG. 7, there are a first optical amplifier and a second optical amplifier, according to the transmission direction of the input light source, the most front-end optical amplifier 5 is the first optical amplifier. In a multi-span cascaded optical transmission system, the normally working optical amplifiers 5 all work in the constant gain mode, and the gain of each amplifier compensates for the loss of the optical fiber span.

[0176] As shown in FIG. 8, when a failure occurs, the first embodiment of the present application switches the first input light abnormal optical amplifier 5 to the constant power mode.

[0177] In step 502, in the optical transmission link, at least one optical amplifier 5 located behind the most front-end optical amplifier 5 is determined as a to-be-adjusted optical amplifier; the gain of the to-be-adjusted optical amplifier is increased by a preset value, so that the output optical power of the to-be-adjusted optical amplifier when a failure occurs is consistent with the corresponding output optical power when working normally.

[0178] The preset value is selected by a person skilled in the art according to a specific use scenario. As shown in FIG. 8, the frontmost optical amplifier 5 is a first optical amplifier, and the optical amplifier to be adjusted is a second optical amplifier.

[0179] When there is an abnormality in the input light source of the optical amplifier 5 or no light is input, the flat output power of a common optical amplifier is low, which causes the input light power of the subsequent stage to be lower than that in normal operation, so the embodiment of the present application increases the gain of the subsequent stage or even multiple stages of optical amplifiers (for example, the second optical amplifier shown in FIG. 8), so as to ensure that the output is consistent with that in normal operation.

[0180] As shown in FIG. 8, in the cascaded optical transmission system, the embodiment of the present application realizes optical power stabilization by switching the working mode and gain of the optical amplifier 5.

[0181] Embodiment 9:

[0182] As shown in FIG. 16, it is a schematic diagram of the architecture of the device for filling the fault state fast false wave optical power according to the embodiment of the present application. The device can be regarded as the control unit 4 in the above-mentioned embodiments. The device for filling the fault state fast false wave optical power according to the embodiment of the present application includes one or more processors 21 and a memory 22. In FIG. 16, one processor 21 is taken as an example.

[0183] The processor 21 and the memory 22 can be connected through a bus or other means. In FIG. 16, connection through a bus is taken as an example.

[0184] The memory 22 is a non-volatile computer readable storage medium, which can be used to store non-volatile software programs and non-volatile computer executable programs, such as the method for filling the fault state fast false wave optical power in the above-mentioned embodiments. The processor 21 executes the method for filling the fault state fast false wave optical power by running the non-volatile software programs and instructions stored in the memory 22.

[0185] The memory 22 can include a high-speed random access memory and can also include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 22 can optionally include a memory remotely arranged relative to the processor 21, and these remote memories can be connected to the processor 21 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0186] The program instructions / modules are stored in the memory 22, and when executed by the one or more processors 21, the method for filling the fault state fast false wave optical power in the above-mentioned embodiments is executed.

[0187] The embodiment of the present application further provides a nonvolatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are executed by one or more processors, for example, a processor 21 in FIG. 16, so that the one or more processors can execute the method for filling false wave optical power in a failure state quickly in the embodiment of the present application; the various modules and units in FIG. 16 can also be implemented; or the method for filling false wave optical power in a failure state quickly in the embodiment of the present application is executed.

[0188] It is worth noting that the information interaction, execution process and the like between the modules and units in the above apparatus and system are based on the same concept as the processing method embodiments of the present application, and the specific content can be referred to the description in the method embodiments of the present application, which will not be described here.

[0189] Those skilled in the art can understand that all or part of the steps in the various methods of the embodiments can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium, and the storage medium can include a read only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and the like.

[0190] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for rapid pseudo-wavelength power filling in a fault state, characterized in that, It includes a pseudo-wave seed light source (1), an optical switch (2), a first optical power detection unit (3), and a control unit (4); The output terminal of the optical switch (2) is connected to the signal input terminal of the optical amplifier (5), the first input terminal of the optical switch (2) is connected to the fake wave seed light source (1), and the second input terminal of the optical switch (2) is connected to the transmission path of the real light signal. The first optical power detection unit (3) is disposed on the transmission path of the true optical signal; A fake wave seed light source (1) is used to generate fake light signals; The first optical power detection unit (3) is used to detect the optical power of the true optical signal; The control unit (4) is used to control the switching of the optical switch (2) according to the optical power of the true optical signal, so that when the true optical signal is abnormal, the output terminal of the optical switch (2) switches to be connected with the first input terminal of the optical switch (2), thereby transmitting the false optical signal to the optical amplifier (5) to reduce the impact on other channels in the downstream multiplexing section; When the true light signal returns to normal, the output of the optical switch (2) is switched to be connected to the second input of the optical switch (2), thereby transmitting the true light signal to the optical amplifier (5) for normal signal transmission.

2. The apparatus for rapid pseudo-wavelength power filling in fault conditions according to claim 1, characterized in that, It also includes a second optical power detection unit (6) and a variable optical attenuator (7); Between the fake wave seed light source (1) and the first input terminal of the optical switch (2), the variable optical attenuator (7) and the second optical power detection unit (6) are arranged in sequence; The second optical power detection unit (6) is used to detect the optical power of the spurious optical signal; The variable optical attenuator (7) is used to attenuate the spurious optical signal; The control unit (4) is also used to record the optical power of the true optical signal as the reference optical power before the true optical signal is abnormal, and to adjust the variable optical attenuator (7) according to the optical power of the false optical signal after the true optical signal is abnormal, so that the optical power of the false optical signal is consistent with the reference optical power.

3. The apparatus for rapid pseudo-wavelength power filling in fault conditions according to claim 2, characterized in that, The step of adjusting the variable optical attenuator (7) according to the optical power of the dummy optical signal to keep the optical power of the dummy optical signal consistent with the reference optical power specifically includes: Adjust the variable optical attenuator (7) until the difference between the optical power of the spurious optical signal detected by the second optical power detection unit (6) and the reference optical power is less than the first preset difference.

4. The apparatus for rapid pseudo-wavelength power filling in fault conditions according to claim 1, characterized in that, It also includes an adjustable filter (8) and a spectral detection unit (9); An adjustable filter (8) is provided between the fake wave seed light source (1) and the first input terminal of the optical switch (2); The spectral detection unit (9) is located at the output end of the optical switch (2); The spectral detection unit (9) is used to detect the spectrum of the output optical signal; The adjustable filter (8) is used to filter the emitted light from the fake wave seed light source (1) to obtain a fake light signal; The control unit (4) is also used to record the optical power of the output optical signal as the reference spectrum before the true optical signal is abnormal, and to adjust the adjustable filter (8) after the true optical signal is abnormal so that the spectrum of the output optical signal obtained after the false optical signal is amplified by the optical amplifier (5) is consistent with the reference spectrum.

5. The apparatus for rapid pseudo-wavelength power filling in fault conditions according to claim 1, characterized in that, The first optical power detection unit (3) includes a coupler (31) and a photodetector (32); The input end and the first output end of the coupler (31) are coupled to the transmission path of the true optical signal; The second output terminal of the coupler (31) is connected to the photodetector (32); The coupler (31) is used to split the light from the true light signal to obtain the probe light; The photodetector (32) is used to detect the optical power of the probe light in order to calculate the optical power of the true optical signal based on the optical power of the probe light.

6. The apparatus for fault-state fast pseudo-wavelength power filling according to any one of claims 1-5, characterized in that, The abnormality of the true light signal is manifested as follows: the optical power of the true light signal detected by the first optical power detection unit (3) is less than the preset optical power.

7. The apparatus for fault-state fast pseudo-wavelength power filling according to any one of claims 1-5, characterized in that, The pseudo-wave seed light source (1) is a flat spectrum seed light source.

8. The apparatus for fault-state fast pseudo-wavelength power filling according to any one of claims 1-5, characterized in that, The spectral range of the pseudo-wave seed light source (1) covers the operating wavelength range of the optical amplifier (5).

9. An optical wavelength division multiplexing transmission system, characterized in that, Includes a wavelength division multiplexer (10), multiple optical amplifiers (5), and a wavelength division multiplexer (11); Each output terminal of the wavelength division multiplexer (10) is connected to a corresponding optical amplifier (5), and the output terminal of each optical amplifier (5) is connected to each input terminal of the wavelength division multiplexer (11). The device for fault-state fast spurious optical power filling as described in any one of claims 1-8 is provided at at least one optical amplifier (5).

10. The optical wavelength division multiplexing transmission system according to claim 9, characterized in that, The system is used to transmit C-band signal light and L-band signal light; the plurality of optical amplifiers (5) include a C-band optical amplifier (51) and an L-band optical amplifier (52).

11. The optical wavelength division multiplexing transmission system according to claim 10, characterized in that, A first dummy wave optical power filling device is provided at the position of the C-band optical amplifier (51), and / or a second dummy wave optical power filling device is provided at the position of the L-band optical amplifier (52); Wherein, the first dummy wave power filling device and the second dummy wave power filling device are both devices for fault-state fast dummy wave power filling as described in any one of claims 1-8, the dummy light signal in the first dummy wave power filling device is C-band, and the dummy light signal in the second dummy wave power filling device is L-band.

12. The optical wavelength division multiplexing transmission system according to claim 9, characterized in that, When the system contains a multi-segment cascaded optical transmission system obtained by cascading multiple optical amplifiers (5), and the true optical signal of the multi-segment cascaded optical transmission system is abnormal, the first optical amplifier (5) that receives the abnormal true optical signal in the multi-segment cascaded optical transmission system is switched to constant power mode, and one or more optical amplifiers (5) after the first optical amplifier (5) are increased to ensure that the power of the output optical signal of the multi-segment cascaded optical transmission system remains unchanged.

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