CN116264480A

CN116264480A - Optical transmission equipment and system

Info

Publication number: CN116264480A
Application number: CN202111524310.XA
Authority: CN
Inventors: 王步云; 钟健; 罗俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2023-06-16
Also published as: WO2023109279A1

Abstract

The embodiment of the application provides an optical transmission device and a system, wherein the device comprises: the first fake light and the second fake light generating module generates a first fake light and a second fake light; the first fake light filling module receives the first input signal light and the first fake light and generates first output signal light; the control module is used for determining the optical power of the input light of the first fake light filling module and/or the amplification gain of the first fake light filling module according to the relation between the optical power of the first output signal light and the first reference value so that the optical power of the first output signal light is equal to the first reference value; and the second fake light filling module controls the wavelength range of the input second fake light according to the wavelength range of the received first output signal light, so that the wavelength range of the second output signal light is kept unchanged. According to the optical power stabilizing device, the optical power of the input end of the second pseudo-optical filling module is maintained to be stable through the first pseudo-optical filling module, so that the Raman gain of the second output signal light in the downstream optical fiber transmission process is kept to be stable, and the stability of a system is improved.

Description

Optical transmission equipment and system

Technical Field

Embodiments of the present application relate to the field of optical access and optical transmission network technology, and more particularly, to an optical transmission device and system.

Background

With the development of communication technologies, new services and applications such as fifth generation mobile communication technologies (5th generation mobile communication technology,5G), augmented reality (augmented reality, AR), virtual Reality (VR), cloud computing, high definition video, and internet of things are rapidly emerging, and demands for network traffic are rapidly increasing. Currently, two schemes for improving the transmission capacity of a network are used to increase the number of optical fiber deployments and improve the transmission capacity of a single fiber. The spectrum bandwidth expansion based on the wavelength division multiplexing (wavelength division multiplexing, WDM) technology has the advantages of convenient and flexible implementation, high economic benefit and the like, and is a preferred expansion scheme at present.

However, due to stimulated raman scattering (stimulated raman scattering, SRS) effects present in the optical fiber, the optical power is shifted from wavelength to wavelength, and thus when the power of a wavelength or a combination of wavelength channels is changed, the spectral tilt caused by the raman effect is changed, which in turn results in degradation of the flatness of the signal optical power of the different wavelength channels of the WDM transmission system. Particularly, if the system fails to respond timely, the system performance is degraded, so that burst error codes are generated.

Therefore, how to ensure stability of system performance is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides an optical transmission device and a system, which can maintain the stability of the Raman gain of the system and improve the stability of the system performance.

In a first aspect, there is provided an optical transmission device comprising: the device comprises a first fake light generation module, a first fake light filling module, a control module, a second fake light generation module and a second fake light filling module, wherein the first fake light generation module is used for generating first fake light; the second fake light generation module is used for generating second fake light; the first fake light filling module is used for receiving first input signal light and the first fake light, processing the first input signal light and the first fake light and generating first output signal light; the control module is configured to determine, according to a relationship between an optical power of the first output signal light and a first reference value, an optical power of input light of the first dummy light filling module and/or an amplification gain of the first dummy light filling module, so that the optical power of the first output signal light is equal to the first reference value, where the first reference value corresponds to a set range of optical powers when the first output signal light is in a full wave state and optical signals of each wavelength in the first output signal light are in a normal state; the second dummy light filling module is configured to receive the first output signal light, and control a wavelength range of the second dummy light according to a wavelength range of the first output signal light, so that the wavelength range of the second output signal light remains unchanged.

It will be appreciated that the control module is further configured to obtain the optical power of the first output signal light, for example, the optical power of the first output signal light may be detected by a light detector, and the control module obtains the optical power of the first output signal light detected by the light detector.

Based on the scheme, the power filling of the first fake light filling module ensures that the optical power of the input end of the second fake light filling module is stable, so that the Raman gain of the second output signal light in the downstream optical fiber transmission is kept stable.

With reference to the first aspect, in certain implementation manners of the first aspect, the first dummy-fill module includes: the first pseudo optical combiner is used for receiving the first input signal light and the first pseudo light, and adjusting the input optical power of the first input signal light and the first pseudo light according to the optical power of the input light of the first pseudo light filling module to generate first coupling signal light; the first amplifier is configured to amplify the first coupling signal light according to an amplification gain of the first dummy light filling module to generate the first output signal light.

With reference to the first aspect, in certain implementation manners of the first aspect, the first dummy-fill module includes: the first amplifier is used for amplifying the first input signal light according to the amplification gain of the first fake light filling module to generate first amplified signal light; the first spurious light combiner is configured to receive the first amplified signal light and the first spurious light, adjust the input optical power of the first amplified signal light and the first spurious light according to the optical power of the input light of the first spurious light filling module, and generate the first output signal light.

With reference to the first aspect, in certain implementation manners of the first aspect, the first dummy-fill module includes: the first amplifier comprises an input stage of the first amplifier and an output stage of the first amplifier, the input stage of the first amplifier is used for receiving the first input signal light, generating spontaneous emission light with preset optical power according to the optical power of the first input signal light, and the output stage of the first amplifier is used for amplifying the first input signal light and the spontaneous emission light according to the amplification gain of the first fake light filling module to generate the first output signal light.

With reference to the first aspect, in certain implementation manners of the first aspect, the first dummy-fill module includes: the first amplifier comprises an input stage of the first amplifier and an output stage of the first amplifier, and the input stage of the first amplifier is used for amplifying the first input signal light according to the amplification gain of the first fake light filling module to generate first amplified signal light; the first spurious optical combiner is configured to receive the first amplified signal light and the first spurious light, adjust input optical power of the first amplified signal light and the first spurious light according to optical power of input light of the first spurious light filling module, and generate first coupled signal light; and the output stage of the first amplifier is used for amplifying the first coupling signal light to generate the first output signal light according to the amplification gain of the first fake light filling module.

With reference to the first aspect, in certain implementation manners of the first aspect, when the optical power of the first output signal light is smaller than the first reference value, the control module is specifically configured to increase the amplification gain of the first optical amplifier, so that the first optical amplifier operates in an automatic optical power locking state.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to increase an optical power of the first artificial light input by the first artificial light combiner.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to: and determining that the absolute value of the difference between the optical power of the first input signal light and a second reference value is larger than a first threshold value, wherein the first threshold value corresponds to the maximum adjustment amount of the gain of the first optical amplifier, and the second reference value corresponds to a set range of the optical power when the first input signal light works in a full wave state and the optical signals of all wavelengths in the first input signal light work in a normal state.

It should be appreciated that the control module is further configured to obtain the optical power of the first input signal light, for example, the optical power of the first input signal light may be detected by a photodetector, and the control module obtains the optical power of the first input signal light detected by the photodetector.

When the control module controls the gain of the first amplifier to be the maximum adjustment amount, the optical power of the first input light is smaller than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is negative.

With reference to the first aspect, in certain implementation manners of the first aspect, when the optical power of the first output signal light is greater than the first reference value, the control module is specifically configured to reduce the optical power of the first spurious light input by the first spurious light combiner.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to reduce an amplification gain of the first optical amplifier, so that the first optical amplifier operates in an automatic optical power locked state.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to: the absolute value of the difference between the optical power of the first input signal light and a second reference value is determined to be larger than a first threshold value, the first threshold value corresponds to a setting range of the optical power when the first dummy light filling module is used for adjusting the attenuation of the first dummy light power to the maximum value, and the second reference value corresponds to the optical power when the first input signal light is used in a full wave state and the optical signals of all wavelengths in the first input signal light are used in a normal state.

When the control module controls the first pseudo optical combiner to adjust the attenuation of the optical power of the first pseudo light to a maximum value, the optical power of the first input light is greater than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is positive.

With reference to the first aspect, in certain implementations of the first aspect, the apparatus further includes: the device comprises a third fake light generation module and a third fake light filling module, wherein the third fake light generation module is used for generating third fake light; the third dummy light filling module is used for receiving second input signal light and the third dummy light, processing the second input signal light and the third dummy light and generating third output signal light; the control module is further configured to determine, according to a relationship between the optical power of the third output signal light and a third reference value, the optical power of the input light of the third dummy light filling module and/or the amplification gain of the third dummy light filling module, so that the optical power of the third output signal light is equal to the third reference value, where the third reference value corresponds to a set range of optical powers when the third output signal light operates in a full wave state and optical signals of each wavelength in the third output signal light operate in a normal state.

Based on the scheme, the optical transmission equipment can be applied to a wavelength division multiplexing system of signal light with two or more wave bands, so that the Raman gain of the signal in the downstream optical fiber transmission is kept stable.

With reference to the first aspect, in certain implementation manners of the first aspect, the second dummy light filling module is further configured to receive the third output signal light, and control a wavelength range of the second dummy light according to a wavelength range of the third output signal light, so that a wavelength range of the fourth output signal light remains unchanged, where a transmission direction of the first output signal light is the same as a transmission direction of the third output signal light.

With reference to the first aspect, in certain implementations of the first aspect, the apparatus further includes: the fourth fake light generation module is used for generating fourth fake light; the second dummy light filling module is further configured to receive the third output signal light, control a wavelength range of the fourth dummy light according to the wavelength range of the third output signal light, so that the wavelength range of the fourth output signal light remains unchanged, and the transmission direction of the first output signal light is opposite to that of the third output signal light.

Based on the scheme, by utilizing the walk-off effect of opposite transmission, when a certain wave band signal light in the system drops, the accumulation of SRS effect generated on the signal light of the other wave band can be reduced.

With reference to the first aspect, in certain implementation manners of the first aspect, the third dummy light filling module includes: the second pseudo optical combiner is used for receiving the second input signal light and the third pseudo light, and adjusting the input optical power of the second input signal light and the third pseudo light according to the optical power of the input light of the third pseudo light filling module to generate second coupling signal light; and the second amplifier is used for amplifying the second coupling signal light to generate the third output signal light according to the amplification gain of the third fake light filling module.

With reference to the first aspect, in certain implementation manners of the first aspect, the third dummy light filling module includes: the second amplifier is used for amplifying the second input signal light according to the amplification gain of the third fake light filling module to generate second amplified signal light; the second pseudo optical combiner is configured to receive the second amplified signal light and the third pseudo light, adjust input optical powers of the second amplified signal light and the third pseudo light according to optical powers of input lights of the third pseudo light filling module, and generate the third output signal light.

With reference to the first aspect, in certain implementation manners of the first aspect, the third dummy light filling module includes: the second amplifier comprises an input stage of the second amplifier and an output stage of the second amplifier, the input stage of the second amplifier is used for receiving the second input signal light and generating spontaneous emission light with preset optical power according to the optical power of the second input signal light, and the output stage of the second amplifier is used for amplifying the second input signal light and the spontaneous emission light according to the amplification gain of the third pseudo-optical filling module and generating the third output signal light.

With reference to the first aspect, in certain implementation manners of the first aspect, the third dummy light filling module includes: the second amplifier comprises an input stage of the second amplifier and an output stage of the second amplifier, and the input stage of the second amplifier is used for amplifying the second input signal light according to the amplification gain of the third fake light filling module to generate second amplified signal light; the second pseudo optical combiner is configured to receive the second amplified signal light and the third pseudo light, and adjust input optical powers of the second amplified signal light and the third pseudo light according to optical powers of input lights of the third pseudo light filling module, so as to generate second coupled signal light; and the output stage of the second amplifier is used for amplifying the second coupling signal light to generate the third output signal light according to the amplification gain of the third fake light filling module.

With reference to the first aspect, in certain implementation manners of the first aspect, when the optical power of the third output signal light is smaller than the third reference value, the control module is specifically configured to increase the amplification gain of the second optical amplifier, so that the second optical amplifier operates in an automatic optical power locking state.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to increase an optical power of the third artificial light input by the second artificial light combiner.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to: determining that an absolute value of a difference between the optical power of the second input signal light and a fourth reference value is larger than a second threshold value, wherein the second threshold value corresponds to a maximum adjustment amount of the gain of the second optical amplifier, and the fourth reference value corresponds to a set range of optical power when the second input signal light works in a full wave state and optical signals of all wavelengths in the second input signal light work in a normal state.

When the control module controls the gain of the second amplifier to be the maximum adjustment amount, the optical power of the second input light is smaller than the fourth reference value, that is, the difference between the optical power of the second input signal light and the fourth reference value is negative.

With reference to the first aspect, in certain implementation manners of the first aspect, when the optical power of the third output signal light is greater than the third reference value, the control module is specifically configured to reduce the optical power of the third spurious light input by the second spurious light combiner.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to reduce an amplification gain of the second optical amplifier, so that the second optical amplifier operates in an automatic optical power locked state.

With reference to the first aspect, in certain implementation manners of the first aspect, the control module is further configured to: determining that the absolute value of the difference between the optical power of the second input signal light and a fourth reference value is larger than a second threshold value, wherein the second threshold value corresponds to a set range of optical power when the third spurious light filling module is used for adjusting the attenuation of the third spurious light power to a maximum value, the fourth reference value corresponds to the second input signal light to be operated in a full wave state, and the optical signals of all wavelengths in the second input signal light are operated in a normal state.

When the control module controls the second pseudo optical combiner to adjust the attenuation of the optical power of the third pseudo light to a maximum value, the optical power of the second input light is greater than a fourth reference value, that is, the difference between the optical power of the second input signal light and the fourth reference value is positive.

With reference to the first aspect, in certain implementations of the first aspect, the second dummy optical fill module includes a reconfigurable optical add drop multiplexer ROADM.

In a second aspect, there is provided an optical transmission system comprising an optical transmission device according to any of the first aspects described above.

Drawings

Fig. 1 shows a schematic diagram of a WDM transmission system suitable for use in embodiments of the present application.

Fig. 2 shows a schematic diagram of optical power transfer between wavelengths caused by raman effect in optical fiber transmission.

Fig. 3 shows a schematic diagram of an optical transmission device 300 according to an embodiment of the present application.

Fig. 4 shows a schematic diagram of a real wave and a false light replacement.

Fig. 5 shows a schematic diagram of an optical transmission device 500 according to an embodiment of the present application.

Fig. 6 shows a schematic diagram of an optical transmission device 600 according to an embodiment of the present application.

Fig. 7 shows a schematic diagram of an optical transmission device 700 according to an embodiment of the present application.

Fig. 8 shows a schematic diagram of an optical transmission device 800 according to an embodiment of the present application.

Fig. 9 shows a schematic diagram of a pseudo optical combiner according to an embodiment of the present application.

Fig. 10 shows a schematic diagram of input signal light and spurious light output optical power output by a spurious optical combiner.

Fig. 11 shows a schematic diagram of another pseudo optical combiner provided in an embodiment of the present application.

Fig. 12 shows a schematic diagram of an optical transmission apparatus 1200 according to an embodiment of the present application.

Fig. 13 shows a schematic diagram of an optical transmission apparatus 1300 according to an embodiment of the present application.

Fig. 14 shows a schematic diagram of an optical transmission device 1400 provided in an embodiment of the present application.

Fig. 15 shows a schematic diagram of an optical transmission device 1500 provided in an embodiment of the present application.

Fig. 16 shows a schematic diagram of a variation of SRS effect of the second band signal light under the walk-off effect.

Detailed Description

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

The optical transmission equipment and the system provided by the embodiment of the application can be applied to an optical fiber communication network.

The following description is made in order to facilitate understanding of the embodiments of the present application.

The first, the text descriptions of embodiments of the application or the terms in the drawings shown below, "first," "second," "third," "fourth," etc. and various numerical numbers are merely for descriptive convenience and are not necessarily used to describe a particular order or sequence or to limit the scope of embodiments of the application. For example, distinguishing between different states of the optical signal after different steps, etc.

The terms "comprises," "comprising," and "having," in the context of the present application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the third embodiment, in the following embodiments of the present application, the dummy light (dummy light) is an optical signal that does not include service information, and the corresponding optical signal may be a real-wave optical signal, that is, an optical signal that carries service information.

Fourth, in the present embodiment, "/" may indicate that the associated object is an "or" relationship, e.g., a/B may indicate a or B; "and/or" may be used to describe that there are three relationships associated with an object, e.g., a and/or B, which may represent: a exists alone, A and B exist together, and B exists alone. Wherein A, B may be singular or plural.

Fifth, in the present embodiments, the words "exemplary" or "such as" are used to mean examples, illustrations, or descriptions, and embodiments or designs described as "exemplary" or "such as" should not be construed as being preferred or advantageous over other embodiments or designs. The use of the word "exemplary" or "such as" is intended to present the relevant concepts in a concrete fashion to facilitate understanding.

With the development of communication technology, WDM technology makes tens or even hundreds of optical channels exist in an optical fiber, and in a schematic diagram of a typical WDM transmission system as shown in fig. 1, information to be transmitted is modulated at different optical frequencies, that is, transmitted on optical channels with different wavelengths. In order to realize flexible scheduling of services, a reconfigurable optical add-drop multiplexer (ROADM) can be added in the middle of an optical fiber link, which is a device or equipment used in a dense wavelength division multiplexing (dense wavelength division multiplexing, DWDM) system, and the wavelength of the uplink or downlink service can be dynamically adjusted by remote reconfiguration according to any wavelength of the uplink or downlink service, so that the purpose of flexible scheduling of services is achieved.

Generally, in WDM transmission systems, a high-power multi-wavelength optical signal is coupled into an optical fiber, so that the multi-wavelength optical signal is concentrated on a very small interface, and the optical fiber starts to exhibit nonlinear characteristics, where SRS can cause optical power transfer between wavelengths, that is, energy transfer exists between different wavelengths, so that optical power of some wavelengths is reduced, which is one of key factors affecting transmission performance of the system.

Fig. 2 shows the power change diagrams of WDM signals before and after optical fiber transmission, and it can be seen that after optical fiber transmission, the gains applied to different wavelengths by SRS effect are different, the optical power is reduced by obtaining negative gain for short wavelength light, the optical power is increased by obtaining positive gain for long wavelength light, and it can be seen that the energy of the short wavelength is shifted toward the long wavelength, so that the spectral distribution with a certain gradient is formed in which the optical power of the short wavelength is low and the optical power of the long wavelength is high.

The raman gains of different wavelengths due to SRS effect can be described by the following formula.

Wherein the meanings of each parameter are respectively as follows:

P _nout represents the optical power of the nth wavelength after passing through the optical fiber, n E [1, N ]]，P _nin Represents the optical power g of the nth wavelength entering the optical fiber _Ri Indicating when i>n, the Raman gain coefficient of the ith wavelength based on the nth wavelength, P _iin Represents the optical power of the ith wavelength entering the fiber, L _effi Representing the effective fiber length, ω, for the ith wavelength _n Angular frequency, ω, representing the nth wavelength _i Angular frequency, g, representing the i-th wavelength _Rn Represents the Raman gain coefficient of the nth wavelength based on the ith wavelength when i < n, L _effn Representing the effective fiber length, alpha, representing the nth wavelength _n The attenuation coefficient of the optical fiber at the nth wavelength is represented, and L is the length of the optical fiber.

As can be seen from the above equation, the integral of the product of the optical power and the differential raman gain for each wavelength affects the magnitude of the raman gain, i.e., the corresponding raman gain is different for different wavelengths. For example, when the optical spectrum of the system is expanded from the C-band to the c+l-band, the optical spectrum is increased by 2 times, and the maximum raman gain is increased by 4 times, the SRS can bring about more severe power transfer than the C-band system for the c+l system.

In order to stabilize the system operation, a fixed reverse optical power balance is typically applied to the input of the multiplexed optical signal of the WDM system to compensate for the power imbalance due to SRS effects.

However, in an actual optical transmission link, wavelength channels may add or drop due to various factors, resulting in rapid changes in the combination of wavelength channels in the optical fiber link. Generally, the method can be divided into an active wave adding and a passive wave adding. For active add/drop, for example, at a ROADM site, certain wavelengths may be actively scheduled or locally downwave and add by a wavelength selective switch (wavelength selection switch, WSS) as needed, so that a wavelength channel combination in an optical fiber link changes after passing through the ROADM, that is, the optical power spectrum of the WDM signal changes. The speed of such changes is limited by the response speed of the ROADM itself, typically on the order of seconds. For passive add drop, for example, various sudden faults in the system, such as fiber breakage, optical drop faults, etc., will cause some or all of the wavelengths of the WDM signal to be blocked, and the drop caused by such faults occurs in the millisecond order.

It will thus be appreciated that, either for add-drop due to active WSS control or passive add-drop due to system failure, the same reverse equalization compensation is still employed as would occur if the applied reverse equalization compensation did not match the raman gain of the actual fiber due to an increasing or decreasing change in the number of wavelengths or optical power at each wavelength of the WDM system, i.e., resulting in a change in the actual raman gain of the system. That is, the phenomenon that some wavelengths are under-compensated or over-compensated is caused, and further, the optical power of the optical signals with some wavelengths after the optical fibers are transmitted is too low or too high, so that damage cost is introduced to the WDM signals, and in severe cases, service interruption is caused. For example, since the wavelength of the optical signal received by the downstream station is related to the wavelength of the optical signal sent by the upstream station, that is, when the upstream wavelength received by the downstream station is added or subtracted, the raman gain of the associated wavelength of the downstream station is changed, and the change is in two milliseconds, if the change cannot be timely compensated, the error code of the downstream associated wavelength occurs due to performance damage.

In addition, for the active add drop or the passive add drop of the WDM system with the c+l band, the foregoing problem may be further aggravated due to the worse mismatch between the original reverse equalization compensation and the actual raman gain.

In order to avoid the problems caused by the active wave adding and the passive wave adding of the system, the most critical factor is how to ensure that the reverse equalization compensation of the system is matched with the actual raman gain, and essentially, the raman gain changes of different wavelengths caused by the wave adding need to be avoided, and further, how to ensure that the raman gain of the optical fiber transmission system is kept stable, in other words, how to ensure that the raman gain of the output signal light of the downstream node of the system is not influenced by the wave adding at the upstream.

In order to solve the above-mentioned problems, the embodiment of the present application provides an optical transmission apparatus 300, specifically as shown in fig. 3, the optical transmission apparatus 300 includes a first dummy light generating module 311, a first dummy light filling module 312, a control module 313, a second dummy light generating module 321, and a second dummy light filling module 322.

Wherein the first pseudolight generating module 311 is configured to generate a first pseudolight, which may be a broad spectrum spontaneous emission (amplified spontaneousemission, ASE). The first dummy light generating module 311 is connected to the first dummy light filling module 312 through an optical fiber, and inputs the generated first dummy light to an input port of the first dummy light filling module 312.

The first dummy light filling module 312 is configured to receive the first input signal light and the first dummy light, and process the received first input signal light and the first dummy light to generate first output signal light. The first dummy fill module 312 is connected to the second dummy fill module 322 through an optical fiber, and transmits the generated first output signal light to the input port of the second dummy fill module 322.

The second pseudolight generating module 321 is configured to generate a second pseudolight, which may be a broad spectrum ASE. The second dummy light generating module 321 is connected to the second dummy light filling module 322 through an optical fiber, and inputs the generated second dummy light to an input port of the second dummy light filling module 312.

And a control module 313, configured to determine, according to a relationship between the optical power of the first output signal light and a first reference value, the optical power of the input light of the first dummy light filling module 312 and/or the amplification gain of the first dummy light filling module 312 so that the optical power of the first output signal light is equal to the first reference value, where the first reference value corresponds to a set range of optical powers when the first output signal light is in a full wave state and the optical signals of each wavelength in the first output signal light are in a normal state.

It should be noted that, the control module 313 may obtain the optical power of the first output signal light of the output port of the first dummy light filling module 312 or the input port of the second dummy light filling module 322, and determine the adjustment of the first dummy light filling module 312 by determining the relationship between the optical power of the first output signal light and the first reference value, so that the change of the optical power of the adjusted first output signal light satisfies the preset range.

The first reference value corresponds to a set range of optical power when the first output signal light is operated in a full-wave state and the optical signals of the respective wavelengths in the first output signal light are operated in a normal state, and may be understood as optical power when the first output signal light is in a full-wave state when the system is operated normally. It should be understood that the normal operation of the system means that no fault occurs in the system, for example, no fiber breakage or the like occurs, and the power of the first output signal light of the system after the input signal light under normal operation passes through the first dummy light filling module is attenuated, and the system is only damaged inherently by the first dummy light filling module, and no wave dropping or wave adding condition exists.

It should be understood that the value corresponding to the first reference value should be a set range, and the preset range may be a variable range set in advance in the control module 313, and when the control module 313 adjusts the first dummy light filling module 312 to make the optical power of the first output signal light within the preset range, the optical power of the first output signal light is considered to be equal to the first reference value.

Similarly, when the control module 313 acquires the optical power of the first output signal light in real time, if it determines that the optical power of the first output signal light is within the range even though it is varying, it may determine that the optical power of the first output signal light is a constant value, and does not adjust the first dummy fill module 312.

The optical power of the first output signal light obtained by the control module 313 may be obtained by a photodetector or the like, which is not limited in this application.

In addition, the adjusting of the first dummy light filling module 312 by the control module 313 includes, by determining the optical power of the first input signal light and the first dummy light of the first dummy light filling module 312, making the first dummy light filling module 312 adjust the attenuation of the input first input signal light and the first dummy light according to the optical power of the first input signal light and the first dummy light determined by the control module 313, respectively. Or by determining the amplification gain of the first dummy fill module 312, the amplification gain of the first dummy fill module 312 is controlled. Or the control module 313 determines the optical power of the first input signal light input by the first dummy light filling module 312, the optical power of the first dummy light input by the first dummy light filling module 312, and the amplification gain at the same time, so that the first dummy light filling module 312 ensures that the optical power of the first output signal light output by the first dummy light filling module 312 remains constant by adjusting the attenuation amount of the optical power of the input signal and adjusting the amplification gain of the first dummy light filling module 312.

Specifically, when the optical power of the first output signal light acquired by the control module 313 is smaller than the first reference value, the control module 313 may determine an increased input signal optical power and/or an increased amplification gain for the first dummy light filling module 312. In other words, when the optical power of the first output signal light acquired by the control module 313 is smaller than the first reference value, the control module 313 determines that the first dummy light filling module 312 needs to reduce optical attenuation of the first input signal light and the first dummy light and/or increase amplification gains of the first input signal light and the first dummy light.

Correspondingly, when the optical power of the first output signal light acquired by the control module 313 is greater than the first reference value, the control module 313 may determine a reduced input signal optical power and/or a reduced amplification gain for the first dummy light filling module 312. That is, the control module 313 determines that the first dummy light filling module 312 needs to increase optical attenuation of the first input signal light and the first dummy light and/or decrease amplification gain of the first input signal light and the first dummy light.

The second dummy light filling module 322 is configured to receive the first output signal light, and control the wavelength range of the input second dummy light according to the wavelength range of the first output signal light, so that the wavelength range of the second output signal light remains unchanged.

The second dummy light filling module 322 may be implemented by configuring a WSS, where the second dummy light and the first output signal light are synthesized into the line optical fiber by the WSS, and when the system needs to actively schedule or locally perform down-wave and add-wave by the WSS, the second dummy light filling module 322 controls the input wavelength of the second dummy light, so as to ensure that the wavelength channel combination in the system is always stable in a full-wave state.

Next, the operation principle of the apparatus 300 will be described for different scenes.

In one implementation manner, when no line fiber breakage or other signal light input exists in the line, that is, the first input signal light does not have any wave drop or wave addition, the first output signal light is the signal light output after the first input signal light passes through the first pseudo-optical filling module, and because the system works normally, the optical power of the first output signal light is only damaged inherently by the first pseudo-optical filling module. It should be understood that the optical power of the first output signal light is a first reference value of the system. At this time, when the first input signal light passes through the first dummy light filling module 312, the first dummy light filling module 312 may control the optical power of the input first dummy light to be zero, i.e., no first dummy light is input to the system.

The first output signal light is transmitted to the second dummy light filling module through the optical fiber, and if the second dummy light filling module needs local up-down waves at this time according to service requirements, the position of the true wavelength of the second dummy light signal filling wave with the corresponding wavelength can be selected by configuring the WSS, as shown in fig. 4. Likewise, when local adding occurs, the second spurious signals with corresponding wavelengths are blocked by configuring the WSS, and the local real waves are filled into the system. Therefore, the real wave and the second false wave are replaced with each other, and the full wave state in the wavelength channel combination type system is ensured.

In another possible implementation manner, if there is a line fiber break, an optical drop fault, or a signal light input existing in the fault recovery process in the system, that is, the first input signal light is subjected to a wave-down or wave-up, the optical power of the first output signal light acquired by the control module 313 is reduced or increased relative to the first reference value after the first input signal light passes through the first dummy light filling module 312.

For the case that the optical power of the first output signal light becomes smaller, the control module 313 determines that the first dummy light filling module 312 needs to increase the input power of the first dummy light and/or increase the amplification gain, at this time, the first dummy light filling module 312 performs corresponding adjustment according to the input power and/or the amplification gain determined by the control module, so that the optical power of the first output signal light is restored to the first reference value. For the case that the optical power of the first output signal light becomes larger, the control module 313 determines that the first dummy light filling module 312 needs to reduce the input power and/or the reduced amplification gain of the first dummy light, and at this time, the first dummy light filling module 312 performs corresponding adjustment according to the input power and/or the amplification gain determined by the control module, so that the optical power of the first output signal light is reduced to the first reference value.

It should be noted that, for the second spurious filling module 322, the scheme of implementing the mutual replacement of the real wave signal and the second spurious wavelength by the WSS is limited to the response speed of the WSS (generally, the response speed is in the order of seconds). For the case that the optical fiber system fails (typically in the order of milliseconds) so that the system is passively dropped, the second spurious light cannot be timely filled with wavelengths due to the real wave drop, that is, the wavelength channel combination of the system has been changed before the second spurious light is filled, so that the performance of the system is degraded, and even the service of some wavelength channels may be interrupted.

Furthermore, since the channel power of the real wave is gradually reduced during the actual wave-down, the time for which the power drops to a LOSs of signal (LOS) state is related to the type of fault causing the wave-down, which may be in the order of milliseconds or seconds. However, only when the channel of the real wave is detected to reach the LOS state, the second spurious light of the second spurious light filling module 322 is filled, and at this time, since the power of the wavelength channel of the real wave has been changed, the wavelength power gain caused by the SRS effect will also be changed, which also causes degradation of the system performance.

Therefore, the existence of the first fake light filling module can ensure that the optical power at the input end of the second fake light filling module is always kept unchanged, so that the change of Raman gains of different wavelengths caused by passive wave adding and dropping is avoided, the Raman gains of different wavelengths generated by a system due to SRS effect are kept stable, and the stability of the system performance is maintained.

In addition, no matter for line fiber breaking or signal light input, in the process, the optical power change of the first input signal light is a gradually decreasing or gradually increasing process, so the control module 313 can determine the input power and/or the amplification gain to be adjusted by the first dummy light filling module 312 according to the optical power of the first output signal light in real time, and realize dynamic and real-time compensation for the change of the optical power spectrum caused by adding and dropping waves, so that the optical power of the output first signal light is always equal to the first reference value.

In summary, in the optical transmission device 300 provided by the embodiment of the present application, not only the unstable raman gain caused by the active adding and dropping wave generated by service switching can be solved, but also real-time and dynamic compensation can be realized under various sudden faults of the WDM optical fiber transmission system, and the raman gains of different wavelengths output by the system are maintained to be stable due to the change of the optical power spectrum introduced by adding and dropping wave, so that the raman gain does not have transient change in the whole process, and stable system performance is ensured.

Next, the optical transmission device is described in detail in connection with the structure of the different first dummy light filling modules.

Fig. 5 shows a schematic diagram of an optical transmission device 500 according to an embodiment of the present application, specifically, as shown in fig. 5, the optical transmission device 500 includes a first dummy light generating module 511, a first dummy light filling module 512, a control module 513, a second dummy light generating module 521, and a second dummy light filling module 522, where the first dummy light filling module 512 includes a first dummy optical combiner 514 and a first optical amplifier 515, and the second dummy light filling module 522 includes a WSS 523.

Wherein the first pseudolight generating module 511 is configured to generate a first pseudolight, which may be a broad spectrum ASE. The first pseudo light generating module 511 is connected to the first pseudo light combiner 514 through an optical fiber, and inputs the generated first pseudo light to an input port of the first pseudo light combiner 514.

The first pseudo optical combiner 514 is configured to receive the first input signal light and the first pseudo light, and adjust the input optical power of the first input signal light and the first pseudo light according to the optical power of the input light of the first pseudo optical filling module, so as to generate the first coupling signal light. The first pseudo optical combiner 514 is connected to the first optical amplifier 515 through an optical fiber, and transmits the generated first coupling signal light to an input port of the first optical amplifier 515.

The first optical amplifier 515 is configured to amplify the first coupling signal light according to the amplification gain of the first dummy light filling module 512 to generate a first output signal light. The first optical amplifier 515 is connected to the WSS 523 by an optical fiber, and transmits the generated first output signal light to an input port of the WSS 523.

The control module 513 is configured to determine, according to a relationship between the optical power of the first output signal light and a first reference value, the optical power of the input light of the first pseudo optical combiner 514 and/or the amplification gain of the first optical amplifier 515 so that the optical power of the first output signal light is equal to the first reference value, where the first reference value corresponds to a set range of optical powers when the first output signal light is in a full wave state and the optical signals of each wavelength in the first output signal light are in a normal state.

A second pseudolight generating module 521 for generating a second pseudolight, which may be a broad spectrum ASE. The second pseudo-light generating module 521 is connected to the WSS 523 by an optical fiber, and inputs the generated second pseudo-light to an input port of the WSS 523.

The WSS 523 is configured to receive the first output signal light, and control a wavelength range of the second spurious light input according to the wavelength range of the first output signal light so that the wavelength range of the second output signal light remains unchanged.

When no fiber breakage or other fault condition occurs at the upstream of the optical fiber transmission system, the initial state of the WSS 523 is set to be that the wavelengths which are not occupied by the first output signal light are filled with the second spurious light within the operating wavelength range, at this time, the system operates in a full wave state, and the corresponding reverse equalization of the full wave state is configured to compensate the signal light output by the system. When the first output signal light drops according to service needs, the WSS 523 can fill the wavelength position of the dropped first output signal light with the second spurious light of the corresponding wavelength. When a local uplink occurs, the WSS 523 blocks a spurious signal of a corresponding wavelength, and fills the local uplink into the system. That is, the WSS 523 replaces the signal light with the second spurious light, and ensures that the system wavelength channel combination is always in a full wave state, thereby ensuring that the raman effect in the optical fiber is stable, and further, that the performance of the system is stable.

When a fiber break or other fault occurs upstream of the optical fiber transmission system, the optical power of the first input signal light gradually decreases, and in one implementation, when the optical power of the first output signal light obtained by the control module 513 is smaller than the first reference value, the control module 513 may determine an increased input signal optical power and/or increase the amplification gain of the first optical amplifier 515 for the first pseudo optical combiner 514.

Specifically, when the control module 513 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is smaller than the first threshold value, the control module 513 increases the amplification gain of the first optical amplifier 515, controls the first optical amplifier 515 to operate in the automatic optical power lock state, and keeps the power of the output first output signal light unchanged.

When the control module 513 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is greater than or equal to the first threshold value, the control module 513 adjusts the amplification gain of the first optical amplifier 515 to the maximum gain while determining an increased optical power of the input light for the first pseudo optical combiner 514.

The first threshold corresponds to the maximum adjustment amount of the gain of the first optical amplifier 515, and the second reference value corresponds to the set range of the optical power when the first input signal light is operated in the full wave state and the optical signals of the respective wavelengths in the first input signal light are operated in the normal state.

When the control module 513 controls the gain of the first amplifier 515 to be the maximum adjustment amount, the optical power of the first input light is smaller than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is negative.

When the optical power of the first input signal of the optical fiber transmission system is gradually increased during the line gradual recovery process, in a possible implementation manner, when the optical power of the first output signal light obtained by the control module 513 is greater than the first reference value, the control module 513 may determine a reduced optical power of the input signal and/or reduce the amplification gain of the first optical amplifier 515 for the first pseudo optical combiner 514.

Specifically, when the control module 513 determines that the absolute value of the difference between the optical power of the first input signal light and the first reference value is smaller than the first threshold, the control module 513 determines a reduced optical power of the first spurious light to be input to the first spurious light combiner 514, and the first spurious light combiner 514 adjusts the attenuation amounts of the first spurious light to be input and the first input signal light according to the determined input optical power so that the optical power of the first output signal light satisfies the requirement of the control module 513.

When the control module 513 determines that the absolute value of the difference between the optical power of the first input signal light and the first reference value is greater than or equal to the first threshold value, the control module 513 determines that the optical power of the first spurious light input by the first spurious light combiner 514 needs to be minimized while reducing the amplification gain of the first optical amplifier 515, controls the first optical amplifier 515 to operate in the automatic optical power locking state so that the power of the output first output signal light remains unchanged.

Wherein the first threshold corresponds to the first dummy fill module 512 adjusting the attenuation of the first dummy optical power to a maximum. It should be understood that when the attenuation of the optical power of the first dummy light by the first dummy light filling module 512 is adjusted to the maximum value, at this time, the optical power of the first dummy light input by the first dummy light filling module 512 corresponds to the optical power of the minimum first dummy light that can be input by the system.

The first pseudo-optical combiner 514 can adjust the optical power of the first pseudo-light and the first input signal light inputted thereto by controlling the attenuation of the first pseudo-light and the first input signal light according to the optical power of the input light determined by the control module 513, and optically couple the inputted signals to generate a combined-wave optical signal to be outputted.

When the control module 513 controls the first pseudo optical combiner 514 to adjust the attenuation of the optical power of the first pseudo light to the maximum value, the optical power of the first input light is greater than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is positive.

The second reference value corresponds to a set range of optical power in which the first input signal light is operated in a full-wave state and the optical signals of the respective wavelengths in the first input signal light are operated in a normal state, and can be understood as optical power in which the first input signal light is operated in a full-wave state when the system is operated normally. It should be understood that the system is working properly means that the system does not have any faults, e.g. no fiber breakage etc.

In one possible implementation, the first pseudo-optical combiner 514 may be formed by an optical switch, as shown in fig. 9, where in fig. 9, the first pseudo-optical combiner 514 is an optical switch based on a mach-zehnder interferometer structure, and the principle of the optical switch may be simply understood that when two waveguides parallel to each other are close to each other, propagation modes in the waveguides may be coupled during transmission and generate power exchange.

For example, lithium niobate may be used as a substrate, a pair of parallel optical waveguides may be fabricated on the substrate, and Y-type 50/50 couplers may be connected to each end of the waveguides. The voltage is applied to the waveguide area through the electrode, so that the refractive indexes of the two waveguides in the coupling area are changed, the optical path is correspondingly changed, when the refractive indexes are the same, coherence enhancement is formed, and when the refractive indexes are opposite, cancellation is formed, so that the purpose of switching is achieved.

During the adjustment, the optical power of the first input signal light and the optical power of the first dummy light are controlled to be complementary, for example, as shown in fig. 10, so that the output power can be kept stable.

In one possible implementation manner, the first pseudo optical combiner 514 may be configured by two optical attenuators and a coupler, as shown in fig. 11, the first pseudo light and the first input signal light are respectively input into the two optical attenuators, the optical attenuators can attenuate the optical power of the input optical signal to a certain extent, the two attenuators may employ variable attenuators, the attenuation amounts of the two attenuators can be changed within a certain range, and the optical power attenuators can control the attenuation amounts of the optical power of the first pseudo light and the first input signal light according to the optical power of the input light determined by the controller 513, and output the first coupling signal light through the coupler.

In summary, the optical transmission device 500 provided in the present application can quickly compensate for the change of the optical power introduced by adding and dropping waves in the passive line wave adding and dropping scene, so that the raman gain of the system will not generate transient change, and the stability of the system performance is ensured.

Based on the optical transmission device 500 shown in fig. 5, the present application also provides the structures of the first pseudo-optical filling module with other three different structures, as shown in fig. 6, 7 and 8, respectively. And other possible configurations of the second dummy fill module, as shown in fig. 11 and 12, respectively. For simplicity of explanation, fig. 6, 7, 8, 12 and 13 will be described only with respect to the points of distinction from fig. 5.

Fig. 6 shows a schematic diagram of an optical transmission device 600 according to an embodiment of the present application, and specifically, as shown in fig. 6, the optical transmission device 600 is compared with the optical transmission device 500 in fig. 5, where the position of the first amplifier is exchanged with the position of the first optical pseudobulb.

A first optical amplifier 615 for amplifying the first input signal light and generating first amplified signal light according to an amplification gain of the first dummy optical filling module. The first optical amplifier 615 is connected to the first pseudo optical combiner 614 through an optical fiber, and transmits the generated first amplified signal light to an input port of the first pseudo optical combiner 614.

The first spurious combiner 614 is configured to receive the first amplified signal light and the first spurious light, and adjust the input optical power of the first amplified signal light and the first spurious light according to the optical power of the input light of the first spurious light filling module, so as to generate a first output signal light. The first pseudo optical combiner 614 is connected to the WSS 623 through an optical fiber, and transmits the generated first output signal light to an input port of the WSS 623.

The first amplifier 515 in fig. 5 may be configured by a multi-stage amplifier, for example, a two-stage amplifier shown in fig. 7, and in fig. 7, each includes an input stage of the first amplifier and an output stage of the first amplifier, which can achieve the same function as the first amplifier 515 in fig. 5, and an input stage of the first amplifier can achieve the same function as the first amplifier 615 in fig. 6.

Fig. 8 shows a schematic diagram of another light setting forth device 800, in fig. 8 the first dummy light filling module 812 comprises an input stage 811 of a first amplifier and an output stage 814 of the first amplifier.

When a fiber break or other fault occurs upstream of the optical fiber transmission system, the optical power of the first input signal light gradually decreases, and in one possible manner, when the optical power of the first output signal light obtained by the control module 813 is smaller than the first reference value, the control module 813 may increase the amplification gain and/or control the input stage 811 of the first optical amplifier to output the broad spectrum ASE through the output stage 814 of the first optical amplifier.

Specifically, when the control module 813 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is smaller than the first threshold value, the control module 813 increases the amplification gain of the output stage 814 of the first optical amplifier, controls the output stage 814 of the first optical amplifier to operate in the automatic optical power lock state, and makes the power of the output first output signal light equal to the first reference value and remain unchanged.

When the control module 813 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is greater than or equal to the first threshold value, the control module 813 controls the amplification gain of the output stage 814 of the first optical amplifier to be adjusted to the maximum gain, and simultaneously, controls the input stage 811 of the first amplifier to output the broad spectrum ASE of the preset optical power according to the optical power of the second input signal light.

The first threshold corresponds to a maximum adjustment amount of the gain of the output stage 814 of the first optical amplifier, and the second reference value corresponds to a set range of optical power when the first input signal light is operated in a full-wave state and the optical signals of the wavelengths in the first input signal light are operated in a normal state.

When the control module 813 controls the gain of the output stage 814 of the first optical amplifier to be the maximum adjustment amount, the optical power of the first input light is smaller than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is negative.

When the optical power of the first input signal light of the optical fiber transmission system is gradually increased during the line gradually recovering process, in a possible implementation manner, when the optical power of the first output signal light obtained by the control module 813 is greater than the first reference value, the control module 813 may reduce the optical power of the input stage 811 of the first amplifier to output the broad spectrum ASE and/or reduce the amplification gain of the output stage 814 of the first optical amplifier.

Specifically, when the control module 813 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is smaller than the first threshold value, the control module 813 first determines whether the input stage 811 of the first amplifier operates in a state of outputting ASE, and if so, the control module 813 determines a reduced optical power of outputting ASE for the input stage 811 of the first amplifier so that the optical power of the first output signal light is equal to the first reference value.

When the control module 813 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is greater than or equal to the first threshold value, the control module 813 first determines whether the input stage 811 of the first amplifier operates in a state of outputting ASE, and if so, the control module 813 determines a reduced optical power of outputting ASE for the input stage 811 of the first amplifier while reducing the amplification gain of the output stage 814 of the first optical amplifier and operates in an automatic optical power locked state such that the optical power of the first output signal light satisfies the first reference value.

Wherein the first threshold is adjusted to a maximum value corresponding to the attenuation of the input stage 811 of the first amplifier. It will be appreciated that when the attenuation of the input stage 811 of the first amplifier is adjusted to a maximum value, at this time, the ASE optical power emitted from the input stage 811 of the first amplifier corresponds to the optical power of the minimum ASE that can be input by the system.

When the control module 813 controls the attenuation of the optical power of the output ASE of the input stage 811 of the first amplifier to be adjusted to the maximum value, the optical power of the first input light is greater than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is positive.

The second reference value corresponds to a set range of optical power in which the first input signal light is operated in a full-wave state and the optical signals of the respective wavelengths in the first input signal light are operated in a normal state, and can be understood as the optical power in which the first input signal light is operated in the full-wave state when the system is operated normally. It should be understood that the system is working properly means that the system does not have any faults, e.g. no fiber breakage etc.

Fig. 12 shows a schematic diagram of an optical transmission device 1200 with a second pseudooptical filling module being a ROADM, in fig. 12, a ROADM formed by two-stage WSSs, where the ROADM can arbitrarily allocate wavelengths of upper and lower traffic as needed, so as to implement flexible scheduling of traffic.

In the ROADM station, when a local wavelet occurs, a second WSS selects a spurious light signal with a corresponding wavelength to be filled in a position of a missing wavelength corresponding to a real wave light signal of the received local wavelet, and similarly, when the local wavelet occurs, the second WSS is configured to block the second spurious light with the real wave wavelength of the corresponding local wavelet, the real wave of the local wavelet is input into the system, and the second WSS is configured to alternate the real wave signal and the spurious light, so that the combination of wavelength channels of the system is always in a full wave state, and the raman effect in the optical fiber is stable, so that the system performance is kept stable.

Further, on the basis of fig. 12, the first amplifier in the first dummy optical filling module may be an amplifier shared with that in the ROADM, and as shown in fig. 13, the structure makes the optical transmission device smaller in size and more compact in structure.

When there are a plurality of bands of input signal light in the system, since there may be a difference in performance of the optical amplifier for each band, the embodiment of the present application also provides a schematic diagram of the optical transmission apparatus 1400 as shown in fig. 14.

In fig. 14, taking two wavelength bands of the input signal light as an example, the optical transmission apparatus 1400 includes a wavelength band splitter 1410, a first dummy light generating module 1411, a first dummy light filling module 1412, a control module 1413, a second dummy light generating module 1421, a second dummy light filling module 1422, a wavelength band combiner 1420, a third dummy light generating module 1431, and a third dummy light filling module 1432.

Wherein the first dummy optical fill module 1412 includes a first dummy optical combiner 1414 and a first amplifier 1415. The second pseudooptic stuffing module is a ROADM formed by two-stage WSSs. The third dummy optical fill module 1432 includes a first dummy optical combiner 1434 and a first amplifier 1435.

The band splitter 1410 is configured to split input signal light into first input signal light and second input signal light according to a band. The first input signal light has a first wavelength band, for example, the first input signal light may have an operating wavelength of a C-band, and the second input signal light has a second wavelength band, for example, the second input signal light may have an operating wavelength of an L-band.

A first pseudolight generation module 1411 for generating a first pseudolight, which may be a broad spectrum ASE. The first pseudo light generating module 1411 is connected to the first pseudo light combiner 1414 through an optical fiber, and inputs the generated first pseudo light to an input port of the first pseudo light combiner 1414.

The first pseudo optical combiner 1414 is configured to receive the first input signal light and the first pseudo light, and couple the received first input signal light and the first pseudo light according to the input signal light power of the first pseudo optical filling module 1412 to generate a first coupled signal light. The first pseudo optical combiner 1414 is connected to the first optical amplifier 1415 through an optical fiber, and transmits the generated first coupling signal light to an input port of the first optical amplifier 1415.

A first optical amplifier 1415 for amplifying the first coupling signal light to generate a first output signal light according to an amplification gain of the first dummy light filling module 1412. The first optical amplifier 1415 is connected to the ROADM1422 by an optical fiber, and transmits the generated first output signal light to an input port of the ROADM 1422.

A second pseudolight generating module 1421 for generating a second pseudolight, which may be a broad spectrum ASE. The second pseudolight generating module 1421 is connected to the ROADM1422 by an optical fiber, and inputs the generated second pseudolight to an input port of the ROADM 1422.

A third pseudolight generation module 1431 for generating a third pseudolight, which may be a broad spectrum ASE. The third artificial light generating module 1431 is connected to the second artificial light combiner 1434 through an optical fiber, and inputs the generated third artificial light to an input port of the second artificial light combiner 1434.

The second pseudo optical combiner 1434 is configured to receive the second input signal light and the third pseudo light, and couple the received second input signal light and the third pseudo light according to the input signal light power of the third pseudo light filling module 1432 to generate a second coupled signal light. The second pseudo optical combiner 1434 is connected to the second optical amplifier 1435 through an optical fiber, and transmits the generated second coupling signal light to the input port of the second optical amplifier 1435.

And a second optical amplifier 1435 for amplifying the second coupling signal light according to the amplification gain of the third dummy optical filling module 1432 to generate a third output signal light. The second optical amplifier 1435 is connected to the ROADM 1422 through an optical fiber, and transmits the generated first output signal light to an input port of the ROADM 1422.

A control module 1413, configured to determine, according to a relationship between an optical power of the first output signal light and a first reference value, an optical power of the input light of the first pseudo optical combiner 1414 and/or an amplification gain of the first optical amplifier 1415 so that the optical power of the first output signal light is equal to the first reference value, where the first reference value corresponds to a set range of optical powers when the first output signal light is in a full wave state and optical signals of respective wavelengths in the first output signal light are in a normal state.

Meanwhile, the control module 1413 is further configured to determine, according to a relationship between the optical power of the third output signal light and a third reference value, the optical power of the input light of the second pseudo-optical combiner 1434 and/or the amplification gain of the second optical amplifier 1435 so that the optical power of the third output signal light is equal to the third reference value, where the third reference value corresponds to a set range of the optical power when the third output signal light is operated in a full wave state and the optical signals of each wavelength in the third output signal light are operated in a normal state.

ROADM 1422 for receiving the first output signal light and the third output signal light, controlling the wavelength range of the input second spurious light according to the wavelength range of the first output signal light so that the wavelength range of the second output signal light remains unchanged, and controlling the wavelength range of the input second spurious light according to the wavelength range of the third output signal light so that the wavelength range of the fourth output signal light remains unchanged.

When no fiber break, other fault condition or other service signal up-wave occurs upstream of the optical fiber transmission system, the control module 1413 controls the first pseudo optical combiner 1414 to set the input power of the first pseudo light to 0, that is, controls the second pseudo optical combiner 1434 to adjust the attenuation of the third pseudo light to the maximum, at this time, it can be understood that the damage of the first output signal light is only damaged by the first pseudo optical combiner 1414, similarly, the damage of the third output signal light is only damaged by the inherent loss of the second pseudo optical combiner 1434, at this time, the optical power of the first output signal light is equal to the first reference value, and the optical power of the third output signal light is equal to the third reference value.

The first reference value corresponds to a set range of optical power when the first output signal light is operated in a full wave state and the optical signals of the wavelengths in the first output signal light are operated in a normal state. The third reference value corresponds to a set range of optical power in which the third output signal light is operated in a full wave state and the optical signals of the respective wavelengths in the third output signal light are operated in a normal state.

At this time, if the ROADM 1422 is based on the service requirement, when the ROADM 1422 is locally on the uplink, the wavelength of the corresponding second pseudolight is blocked according to the wavelength of the service signal light of the local uplink, and the service signal light of the local uplink is received into the system. When a local wavelet exists, the ROADM 1422 fills the system with the wavelength of the corresponding second pseudolight according to the wavelength of the signal light of the local wavelet.

When a fiber break or other fault occurs upstream of the optical fiber transmission system, at this time, the optical power of the first input signal light (corresponding to the first wavelength band) gradually decreases, and in one implementation, when the optical power of the first output signal light obtained by the control module 1413 is smaller than the first reference value, the control module 1413 may determine an increased input signal optical power for the first pseudo optical combiner 1414 and/or increase the amplification gain of the first optical amplifier 1415.

Specifically, when the control module 1413 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is smaller than the first threshold value, the control module 514 increases the amplification gain of the first optical amplifier 1415, and controls the first optical amplifier 1415 to operate in the automatic optical power locking state so that the power of the outputted first output signal light remains unchanged.

When the control module 1413 determines that the absolute value of the difference between the optical power of the first input signal light and the second reference value is greater than or equal to the first threshold value, the control module 1413 adjusts the amplification gain of the first optical amplifier 1415 to the maximum gain while increasing the optical power of the first dummy light input by the first dummy optical combiner 1414.

The first threshold corresponds to a maximum adjustment amount of the gain of the first optical amplifier 1415, and the second reference value corresponds to a set range of optical power when the first input signal light is operated in a full wave state and the optical signals of the respective wavelengths in the first input signal light are operated in a normal state.

When the control module 1413 controls the gain of the first amplifier 1415 to be the maximum adjustment amount, the optical power of the first input light is smaller than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is negative.

Also, for the second input signal light, the optical power of the second input signal light (corresponding to the second band) gradually decreases due to the upstream failure, and in one possible manner, when the optical power of the third output signal light obtained by the control module 1413 is smaller than the third reference value, the control module 1413 may determine an increased input signal optical power and/or increase the amplification gain of the second optical amplifier 1435 for the second pseudo optical combiner 1434.

Specifically, when the control module 1413 determines that the absolute value of the difference between the optical power of the second input signal light and the fourth reference value is smaller than the second threshold value, the control module 1413 increases the amplification gain of the second optical amplifier 1435, and controls the second optical amplifier 1435 to operate in the automatic optical power locking state so that the power of the output third output signal light remains unchanged.

When the control module 1413 determines that the absolute value of the difference between the optical power of the second input signal light and the fourth reference value is greater than or equal to the second threshold value, the control module 1413 adjusts the amplification gain of the second optical amplifier 1435 to the maximum gain while increasing the optical power of the third artificial light input from the second artificial optical combiner 1434.

The second threshold corresponds to a maximum adjustment amount of the gain of the second optical amplifier 1435, and the fourth reference value corresponds to a set range of optical power when the second input signal light is operated in a full wave state and the optical signals of the respective wavelengths in the second input signal light are operated in a normal state.

When the control module 1413 controls the gain of the second amplifier 1435 to be the maximum adjustment amount, the optical power of the second input light is smaller than the fourth reference value, that is, the difference between the optical power of the second input signal light and the fourth reference value is negative.

When the optical power of the first input signal light or the optical power of the second input signal light is increased during the gradual recovery of the fiber breakage of the optical fiber transmission system, in one possible implementation, when the optical power of the first input signal light is increased, the control module 1413 may determine a reduced input signal optical power and/or reduce the amplification gain of the first optical amplifier 1415 by the first pseudo optical combiner 1414 when the optical power of the first output signal light obtained by the control module 1413 is greater than the first reference value.

Specifically, when the control module 1413 determines that the absolute value of the difference of the optical power of the first input signal light and the first reference value is smaller than the first threshold, the control module 1413 reduces the optical power of the first pseudo light input to the first pseudo light combiner 1414.

When the control module 1413 determines that the absolute value of the difference between the optical power of the first input signal light and the first reference value is greater than or equal to the first threshold value, the control module 1413 minimizes the optical power of the first spurious light input from the first spurious light combiner 1414 while reducing the amplification gain of the first optical amplifier 1415, and controls the first optical amplifier 1415 to operate in an automatic optical power locking state so that the power of the output first output signal light remains unchanged.

Wherein the first threshold corresponds to the attenuation of the first spurious optical power by the first spurious optical combiner 1414 being adjusted to a maximum value.

When the control module 1413 controls the first pseudo optical combiner 1414 to adjust the attenuation of the optical power of the first pseudo light to the maximum value, the optical power of the first input light is greater than the second reference value, that is, the difference between the optical power of the first input signal light and the second reference value is positive.

In another possible implementation, when the optical power of the second input signal light is increased, the control module 1413 may determine a reduced input signal optical power for the second pseudo optical combiner 1434 and/or reduce the amplification gain of the second optical amplifier 1435 when the optical power of the third output signal light acquired by the control module 1413 is greater than the third reference value.

Specifically, when the control module 1413 determines that the absolute value of the difference between the optical power of the second input signal light and the fourth reference value is smaller than the second threshold value, the control module 1413 reduces the optical power of the second pseudo optical combiner 1434 to which the third pseudo light is input.

When the control module 1413 determines that the absolute value of the difference between the optical power of the second input signal light and the fourth reference value is greater than or equal to the second threshold value, the control module 1413 minimizes the optical power of the third dummy light input from the second dummy optical combiner 1434 while reducing the amplification gain of the second optical amplifier 1435, and controls the second optical amplifier 1435 to operate in the automatic optical power locking state so that the power of the output third output signal light remains unchanged.

Wherein the second threshold is adjusted to a maximum value corresponding to the attenuation of the third spurious optical power by the second spurious optical combiner 1434.

When the control module 1413 controls the second pseudo optical combiner 1434 to adjust the attenuation of the optical power of the first pseudo light to the maximum value, the optical power of the second input light is greater than the fourth reference value, that is, the difference between the optical power of the second input signal light and the fourth reference value is positive.

In fig. 14, the first and second pseudo optical combiners 1414 and 1434 may be configured by using optical switches shown in fig. 9 or 11, and the operation thereof may refer to the related description of the first pseudo optical combiner 514 in fig. 5, which is not repeated here.

It should be appreciated that the apparatus 1400 may also be equivalent to the optical transmission device 500 described above when the amplification gains of optical signals of different wavelength bands can be implemented on one amplifier.

In addition, the protection scope of the application is not limited to the scene that the system inputs signal light in only two wave bands, and for the scene with more than two wave bands, it is understood that other false light filling modules can be added at the input end of the second false light filling module, and the effect of independently controlling and adjusting different wave bands is realized.

In summary, the optical transmission device 1400 provided in the present application is applied in a scenario where input signal light has multiple wavebands, and can respectively and independently control each waveband, so as to implement fast compensation for the change of optical power introduced by adding and dropping the wavebands, so that the raman gain of the system cannot be changed in a transient state, and the stability of the system performance is ensured.

Fig. 15 shows a schematic diagram of an optical transmission device 1500 provided in an embodiment of the present application. As shown in fig. 15, the third dummy-fill module is disposed at the output end of the second dummy-fill device, compared to fig. 15, that is, in this fig. 15, a counter-transmission structure may be adopted for a two-band system.

In fig. 15, the first WSS and the second WSS may be used for filling the pseudolight, the input end of the first WSS is connected to the fourth pseudolight generating module through an optical fiber, and is used for obtaining the fourth pseudolight generated by the fourth pseudolight generating module, and the input end of the second WSS is connected to the second pseudolight generating module through an optical fiber, and is used for obtaining the second pseudolight generated by the second pseudolight generating module.

The second dummy light is used for compensating and filling the missing wave band in the first output signal light received by the ROADM, and the fourth dummy light is used for compensating and filling the missing wave band in the third output signal light received by the ROADM.

In the optical transmission apparatus 1500 shown in fig. 15, the walk-off effect of the opposite transmission can average out the drop instants, wherein due to the band 1 or band 2 power variation, the transient raman gain variation is introduced, as shown in fig. 16. As can be seen from fig. 16, when band 1 is dropped, the raman gain of band 2 is changed by the spurious optical combiner in a negligible amount during the time that the spurious optical combiner is filled with spurious light.

In the embodiments of fig. 5, 6, 7, 8, 12, 13, 14 and 15, it should be noted that:

the embodiments of fig. 5, 6, 7, 8, 12, 13, 14 and 15 may be combined with each other, for example, the embodiment of fig. 6 and 14 may be combined, that is, the first dummy light filling module or the third dummy light filling module may have a structure as shown in fig. 6. Or the embodiment shown in fig. 7 may be combined with fig. 15, i.e., the first dummy fill module or the third dummy fill module may adopt a structure as shown in fig. 7, etc.

According to the optical transmission device provided by the embodiment of the present application, the present application further provides an optical transmission system, where the optical transmission system includes the optical transmission device provided by any one of the foregoing embodiments.

It is to be understood that in the above-described embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. Furthermore, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks (illustrative logical block) and steps (steps) described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

In the above-described embodiments, the functions of the respective functional units may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (program) are loaded and executed on a computer, the processes or functions described in accordance with the embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical transmission device, comprising: a first fake light generating module, a first fake light filling module, a control module, a second fake light generating module and a second fake light filling module,

the first fake light generation module is used for generating first fake light;

the second fake light generation module is used for generating second fake light;

the first fake light filling module is used for receiving first input signal light and the first fake light, processing the first input signal light and the first fake light and generating first output signal light;

the control module is configured to determine, according to a relationship between an optical power of the first output signal light and a first reference value, an optical power of input light of the first dummy light filling module and/or an amplification gain of the first dummy light filling module, so that the optical power of the first output signal light is equal to the first reference value, where the first reference value corresponds to a set range of optical powers when the first output signal light is in a full wave state and optical signals of each wavelength in the first output signal light are in a normal state;

the second dummy light filling module is configured to receive the first output signal light, and control a wavelength range of the second dummy light according to a wavelength range of the first output signal light, so that the wavelength range of the second output signal light remains unchanged.

2. The apparatus of claim 1, wherein the first dummy-fill module comprises: a first amplifier and a first pseudo-optical combiner,

the first pseudo optical combiner is configured to receive the first input signal light and the first pseudo light, adjust input optical powers of the first input signal light and the first pseudo light according to optical powers of input light of the first pseudo optical filling module, and generate first coupling signal light;

the first amplifier is configured to amplify the first coupling signal light according to an amplification gain of the first dummy light filling module to generate the first output signal light.

3. The apparatus of claim 1, wherein the first dummy-fill module comprises: a first amplifier and a first pseudo-optical combiner,

the first amplifier is used for amplifying the first input signal light according to the amplification gain of the first fake light filling module to generate first amplified signal light;

the first spurious light combiner is configured to receive the first amplified signal light and the first spurious light, adjust the input optical power of the first amplified signal light and the first spurious light according to the optical power of the input light of the first spurious light filling module, and generate the first output signal light.

4. The apparatus of claim 1, wherein the first dummy-fill module comprises: a first amplifier comprising an input stage of the first amplifier and an output stage of the first amplifier,

an input stage of the first amplifier for receiving the first input signal light, generating spontaneous emission light of a preset optical power according to the optical power of the first input signal light,

and the output stage of the first amplifier is used for amplifying the first input signal light and the spontaneous emission light according to the amplification gain of the first pseudo-light filling module to generate the first output signal light.

5. The apparatus of claim 1, wherein the first dummy-fill module comprises: a first amplifier, a first pseudo-combiner, the first amplifier comprising an input stage of the first amplifier and an output stage of the first amplifier,

the input stage of the first amplifier is used for amplifying the first input signal light according to the amplification gain of the first fake light filling module to generate first amplified signal light;

the first spurious optical combiner is configured to receive the first amplified signal light and the first spurious light, adjust input optical power of the first amplified signal light and the first spurious light according to optical power of input light of the first spurious light filling module, and generate first coupled signal light;

And the output stage of the first amplifier is used for amplifying the first coupling signal light to generate the first output signal light according to the amplification gain of the first fake light filling module.

6. The apparatus according to any one of claims 2 to 5, wherein when the optical power of the first output signal light is smaller than the first reference value,

the control module is specifically configured to increase an amplification gain of the first optical amplifier, so that the first optical amplifier works in an automatic optical power locking state.

7. The apparatus of claim 6, wherein the device comprises a plurality of sensors,

the control module is further configured to increase the optical power of the first spurious light input by the first spurious light combiner.

8. The apparatus of claim 7, wherein the control module is further to:

and determining that the absolute value of the difference between the optical power of the first input signal light and a second reference value is larger than a first threshold value, wherein the first threshold value corresponds to the maximum adjustment amount of the gain of the first optical amplifier, and the second reference value corresponds to a set range of the optical power when the first input signal light works in a full wave state and the optical signals of all wavelengths in the first input signal light work in a normal state.

9. The apparatus according to any one of claims 2 to 5, wherein when the optical power of the first output signal light is greater than the first reference value,

the control module is specifically configured to reduce the optical power of the first spurious light input by the first spurious light combiner.

10. The apparatus of claim 9, wherein the device comprises a plurality of sensors,

the control module is further configured to reduce an amplification gain of the first optical amplifier, so that the first optical amplifier operates in an automatic optical power locked state.

11. The apparatus of claim 10, wherein the control module is further to:

the absolute value of the difference between the optical power of the first input signal light and a second reference value is determined to be larger than a first threshold value, the first threshold value corresponds to a setting range of the optical power when the first dummy light filling module is used for adjusting the attenuation of the first dummy light power to the maximum value, and the second reference value corresponds to the optical power when the first input signal light is used in a full wave state and the optical signals of all wavelengths in the first input signal light are used in a normal state.

12. The apparatus according to any one of claims 1 to 11, characterized in that the apparatus further comprises: a third pseudo-light generating module, a third pseudo-light filling module,

The third fake light generation module is used for generating third fake light;

the third dummy light filling module is used for receiving second input signal light and the third dummy light, processing the second input signal light and the third dummy light and generating third output signal light;

the control module is further configured to determine, according to a relationship between the optical power of the third output signal light and a third reference value, the optical power of the input light of the third dummy light filling module and/or the amplification gain of the third dummy light filling module, so that the optical power of the third output signal light is equal to the third reference value, where the third reference value corresponds to a set range of optical powers when the third output signal light operates in a full wave state and optical signals of each wavelength in the third output signal light operate in a normal state.

13. The apparatus of claim 12, wherein the device comprises a plurality of sensors,

the second dummy light filling module is further configured to receive the third output signal light, control a wavelength range of the second dummy light according to a wavelength range of the third output signal light, so that a wavelength range of the fourth output signal light remains unchanged, and a transmission direction of the first output signal light is the same as a transmission direction of the third output signal light.

14. The apparatus of claim 12, wherein the apparatus further comprises: a fourth one of the pseudo-light generating modules,

the fourth false light generating module is used for generating fourth false light;

the second dummy light filling module is further configured to receive the third output signal light, control a wavelength range of the fourth dummy light according to the wavelength range of the third output signal light, so that the wavelength range of the fourth output signal light remains unchanged, and the transmission direction of the first output signal light is opposite to that of the third output signal light.

15. The apparatus of any one of claims 12 to 14, wherein the third dummy-fill module comprises: a second amplifier and a second pseudo-optical combiner,

the second pseudo optical combiner is configured to receive the second input signal light and the third pseudo light, and adjust input optical powers of the second input signal light and the third pseudo light according to optical powers of input lights of the third pseudo light filling module to generate second coupling signal light;

and the second amplifier is used for amplifying the second coupling signal light to generate the third output signal light according to the amplification gain of the third fake light filling module.

16. The apparatus of any one of claims 12 to 14, wherein the third dummy-fill module comprises: a second amplifier and a second pseudo-optical combiner,

the second amplifier is used for amplifying the second input signal light according to the amplification gain of the third fake light filling module to generate second amplified signal light;

the second pseudo optical combiner is configured to receive the second amplified signal light and the third pseudo light, adjust input optical powers of the second amplified signal light and the third pseudo light according to optical powers of input lights of the third pseudo light filling module, and generate the third output signal light.

17. The apparatus of any one of claims 12 to 14, wherein the third dummy-fill module comprises: a second amplifier including an input stage of the second amplifier and an output stage of the second amplifier,

an input stage of the second amplifier for receiving the second input signal light, generating spontaneous emission light of a preset optical power according to the optical power of the second input signal light,

and the output stage of the second amplifier is used for amplifying the second input signal light and the spontaneous emission light according to the amplification gain of the third pseudo-light filling module to generate the third output signal light.

18. The apparatus of claim 1, wherein the third dummy-fill module comprises: a second amplifier, a second pseudo-combiner, the second amplifier comprising an input stage of the second amplifier and an output stage of the second amplifier,

the input stage of the second amplifier is used for amplifying the second input signal light according to the amplification gain of the third fake light filling module to generate second amplified signal light;

the second pseudo optical combiner is configured to receive the second amplified signal light and the third pseudo light, and adjust input optical powers of the second amplified signal light and the third pseudo light according to optical powers of input lights of the third pseudo light filling module, so as to generate second coupled signal light;

and the output stage of the second amplifier is used for amplifying the second coupling signal light to generate the third output signal light according to the amplification gain of the third fake light filling module.

19. The apparatus according to any one of claims 15 to 18, wherein when the optical power of the third output signal light is smaller than the third reference value,

the control module is specifically configured to increase an amplification gain of the second optical amplifier, so that the second optical amplifier works in an automatic optical power locking state.

20. The apparatus of claim 19, wherein the device comprises a plurality of sensors,

the control module is further configured to increase the optical power of the third artificial light input by the second artificial optical combiner.

21. The apparatus of claim 20, wherein the control module is further configured to:

determining that an absolute value of a difference between the optical power of the second input signal light and a fourth reference value is larger than a second threshold value, wherein the second threshold value corresponds to a maximum adjustment amount of the gain of the second optical amplifier, and the fourth reference value corresponds to a set range of optical power when the second input signal light works in a full wave state and optical signals of all wavelengths in the second input signal light work in a normal state.

22. The apparatus according to any one of claims 15 to 18, wherein when the optical power of the third output signal light is greater than the third reference value,

the control module is specifically configured to reduce the optical power of the third artificial light input by the second artificial optical combiner.

23. The apparatus of claim 22, wherein the device comprises a plurality of sensors,

the control module is further configured to reduce an amplification gain of the second optical amplifier, so that the second optical amplifier operates in an automatic optical power locked state.

24. The apparatus of claim 23, wherein the control module is further configured to:

determining that the absolute value of the difference between the optical power of the second input signal light and a fourth reference value is larger than a second threshold value, wherein the second threshold value corresponds to a setting range of the optical power when the third spurious light filling module is used for adjusting the attenuation of the third spurious light power to the maximum value, and the fourth reference value corresponds to the second input signal light is used in a full wave state and the optical signals of all wavelengths in the second input signal light are used in a normal state.

25. The apparatus according to any one of claims 1 to 24, wherein,

the second dummy optical fill module comprises a reconfigurable optical add-drop multiplexer ROADM.

26. An optical transmission system, characterized in that,

comprising an optical transmission device according to any one of claims 1 to 25.