CN113691346B - Optical power adjusting unit, device, system and method - Google Patents
Optical power adjusting unit, device, system and method Download PDFInfo
- Publication number
- CN113691346B CN113691346B CN202110959911.7A CN202110959911A CN113691346B CN 113691346 B CN113691346 B CN 113691346B CN 202110959911 A CN202110959911 A CN 202110959911A CN 113691346 B CN113691346 B CN 113691346B
- Authority
- CN
- China
- Prior art keywords
- power
- optical
- optical signal
- wavelength
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 364
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 90
- 238000004891 communication Methods 0.000 claims abstract description 57
- 238000012544 monitoring process Methods 0.000 claims abstract description 38
- 238000001228 spectrum Methods 0.000 claims abstract description 25
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 13
- 239000013307 optical fiber Substances 0.000 description 31
- 238000010586 diagram Methods 0.000 description 10
- 239000000835 fiber Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 6
- 229910052691 Erbium Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 4
- 238000001069 Raman spectroscopy Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to the technical field of optical communication and discloses an optical power adjusting unit, an optical power adjusting device, an optical power adjusting system and an optical power adjusting method. The controller determines a gain tilt adjustment value according to the second power data acquired from the communication module and the first power data acquired from the monitoring module, and adjusts the gain flatness of the gain spectrum of the amplifier based on the gain tilt adjustment value so as to adjust the power of each wavelength of light in the second optical signal until the power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold. The method not only can quickly and accurately perform power equalization on the optical signals of the multi-wave transmission system, but also can change the gain flatness of the gain spectrum along with the change of the environment of the transmission link, so that the performance of the receiving end is always in an optimal state.
Description
Technical Field
The present invention relates to the field of optical communications technologies, and in particular, to an optical power adjustment unit, an optical power adjustment device, an optical power adjustment system, and an optical power adjustment method.
Background
Wavelength division multiplexing is a communication technology for combining a series of optical signals carrying information and having different wavelengths into a bundle for transmission, and is one of the most core and most widely applied technologies in modern communication. Because the wavelength division multiplexing technology is to combine light with different wavelengths into one beam for transmission, the loss coefficients of the light with different wavelengths transmitted in the optical fiber are different, and the short wavelength energy is transferred to the long wavelength under the action of stimulated raman scattering, the loss of the light with different wavelengths transmitted in the optical fiber is different, and the power of the light with each wavelength at the receiving end after the light is transmitted through the optical fiber is greatly different from the power of the light with the corresponding wavelength transmitted by the transmitting end, which directly affects the performance of the receiving end of the wavelength division multiplexing system and the capability of transmitting optical signals for a long distance. Therefore, maintaining the power flatness of the optical signal at the receiving end is a problem that must be considered for the transmission of the multi-wavelength optical signal of the wavelength division multiplexing system.
Disclosure of Invention
The inventor finds that the power balance of the optical signals in the transmission of the multi-wavelength optical signals is generally realized by adjusting the gain inclination adjustment value of the optical fiber amplifier, and currently, in practical application, the gain of the optical fiber amplifier is manually set according to experience or the power of the optical signals at the receiving end, and the mode has low efficiency and poor precision and cannot be changed along with the change of the environment of a transmission link.
Aiming at the defects in the prior art, the invention provides an optical power adjusting unit, an optical power adjusting device, an optical power adjusting system and an optical power adjusting method, which can solve the technical problems of low gain efficiency and poor accuracy of an adjusting optical fiber amplifier in the prior art.
The first aspect of the invention provides an optical power adjustment unit comprising a monitoring module, an amplifier, a communication module and a controller; the monitoring module, the amplifier and the communication module can be in communication connection with the controller;
The amplifier is used for amplifying the power of each wavelength of light in the input first optical signal into the power of the corresponding wavelength of light in the output second optical signal according to the gain spectrum;
The monitoring module is used for monitoring first power data of the first optical signals and sending the first power data to the controller, wherein the first power data comprises data of power of light with each wavelength in the first optical signals;
the communication module is configured to acquire and forward second power data of a third optical signal to the controller, where the third optical signal is obtained after the second optical signal passes through a transmission link, and the second power data includes data of power of light of each wavelength in the third optical signal;
The controller is configured to determine a gain tilt adjustment value according to the received first power data and the second power data, and adjust gain flatness of the gain spectrum of the amplifier based on the gain tilt adjustment value, so as to adjust power of each wavelength of light in the second optical signal until power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold.
Optionally, the communication module is further configured to send power data of the optical signal acquired from the monitoring module.
Optionally, the communication module transmits the power data obtained by detecting the optical signal by the monitoring module in the transmission link by using a fourth optical signal, and the working wavelength range of the fourth optical signal of the communication module is not overlapped with the working wavelength ranges of the first optical signal, the second optical signal and the third optical signal of the amplifier.
Optionally, the controller is further configured to set the gain tilt adjustment value to a preset adjustment value when the gain tilt adjustment value exceeds an adjustment range.
Optionally, the determining the gain Tilt adjustment value includes determining the gain Tilt adjustment value Tilt by the following formula:
Tilt＝-SLOP({ΔP1,ΔP2,ΔPi,···,ΔPn},Δλ)×Δλ；
Where Δpi=p outi-Pin i, i=1, 2,..n;
Δλ＝λmax-λmin,1≤max≤n,1≤min≤n,min≤max；
Wherein tin is the gain Tilt adjustment value, SLOP is a slope obtained by linearly fitting a power difference and a wavelength difference, P in i is a power of light of an i-th wavelength in the first optical signal inputted to the amplifier, P out i is a power of light of the i-th wavelength in the third optical signal outputted from the transmission link, Δp1, Δp2, Δ Pi...Δpn are the power differences obtained by subtracting the power of light of the corresponding wavelength in the first optical signal from the power of light of each wavelength in the third optical signal, λ min is a minimum wavelength value of light in the first optical signal, λ max is a maximum wavelength value of light in the first optical signal, and Δλ is the wavelength difference obtained by subtracting the minimum wavelength value from the maximum wavelength value of light in the first optical signal, and n is an arbitrary positive integer.
A second aspect of the present invention provides an optical power adjustment device comprising a transmitting end, a receiving end, at least one transmission link and at least two optical power adjustment units as described above;
The transmitting end and the receiving end are connected through at least one transmission link and at least two optical power adjusting units, and two adjacent optical power adjusting units are connected through one transmission link;
the transmitting end is used for generating and transmitting an optical signal to the first optical power adjusting unit;
the receiving end is used for receiving the last optical signal output by the optical power adjusting unit.
The power of each wavelength of light in the light signal output by the last light power adjusting unit is adjusted by the at least one transmission link and the at least two light power adjusting units, and the difference value between the power of each wavelength of light in the light signal input to the first light power adjusting unit and the power of each wavelength of light in the light signal input to the first light power adjusting unit is a preset value.
Optionally, data transmission is performed between two communication modules in two adjacent optical power adjustment units through the transmission link between the two adjacent optical power adjustment units.
A third aspect of the present invention provides an optical power adjustment system comprising at least two optical power adjustment devices as described above, the optical signal transmission directions of at least two of the optical power adjustment devices being opposite.
A fourth aspect of the present invention provides a method of adjusting optical power, the method comprising:
Monitoring and acquiring first power data of a first optical signal of an amplifier in an input optical power adjusting unit, wherein the first power data comprises data of power of light with each wavelength in the first optical signal;
Acquiring second power data of a third optical signal, wherein the third optical signal is obtained after the second optical signal passes through a transmission link, the second optical signal is obtained after the first optical signal passes through the amplifier, and the second power data comprises data of power of light with each wavelength in the third optical signal;
And determining a gain tilt adjustment value according to the first power data and the second power data, and adjusting the gain flatness of the gain spectrum of the amplifier based on the gain tilt adjustment value so as to adjust the power of each wavelength of light in the second optical signal until the power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold.
Optionally, the determining the gain Tilt adjustment value includes determining the gain Tilt adjustment value Tilt by the following formula:
Tilt＝-SLOP({ΔP1,ΔP2,ΔPi,···,ΔPn},Δλ)×Δλ；
Where Δpi=p outi-Pin i, i=1, 2,..n;
Δλ＝λmax-λmin,1≤max≤n,1≤min≤n,min≤max；
Wherein tin is the gain Tilt adjustment value, SLOP is a slope obtained by linearly fitting a power difference and a wavelength difference, P in i is a power of light of an i-th wavelength in the first optical signal inputted to the amplifier, P out i is a power of light of the i-th wavelength in the third optical signal outputted from the transmission link, Δp1, Δp2, Δ Pi...Δpn are the power differences obtained by subtracting the power of light of the corresponding wavelength in the first optical signal from the power of light of each wavelength in the third optical signal, λ min is a minimum wavelength value of light in the first optical signal, λ max is a maximum wavelength value of light in the first optical signal, and Δλ is the wavelength difference obtained by subtracting the minimum wavelength value from the maximum wavelength value of light in the first optical signal, and n is an arbitrary positive integer.
The invention discloses an optical power adjusting unit which comprises a monitoring module, an amplifier, a communication module and a controller. The controller determines a gain tilt adjustment value according to the second power data acquired from the communication module and the first power data acquired from the monitoring module, and adjusts the gain flatness of the gain spectrum of the amplifier based on the gain tilt adjustment value so as to adjust the power of each wavelength of light in the second optical signal until the power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold. The invention not only can quickly and accurately perform power equalization on the optical signals of the multi-wave transmission system, but also can change the gain flatness of the gain spectrum along with the change of the environment of the transmission link, so that the performance of the receiving end is always in the optimal state.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical power adjustment unit according to an embodiment of the present invention;
FIG. 2 is a linear fitting graph of power of light with different wavelengths after transmission loss according to a second embodiment of the present invention;
FIG. 3 is a graph showing a linear fit of the gain of an amplifier in an optical power adjustment unit for different wavelengths according to a third embodiment of the present invention;
fig. 4 is a schematic diagram of an optical power adjustment unit according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of an optical power adjustment device according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an optical power adjustment system according to a sixth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures in the present invention are described in detail below, wherein it is apparent that the described embodiments are only some embodiments but not all embodiments of the present invention. All other embodiments, based on the embodiments of the invention, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical power adjusting unit according to an embodiment of the invention.
The first aspect of the invention provides an optical power adjustment unit 10, as shown in fig. 1, comprising a monitoring module 1, an amplifier 2, a communication module 3 and a controller 4. The monitoring module 1, the amplifier 2, and the communication module 3 may be communicatively connected to the controller 4.
And the monitoring module amplifier 2 is used for amplifying the power of each wavelength of light in the input first optical signal into the power of the corresponding wavelength of light in the output second optical signal according to the gain spectrum. Preferably, the amplifier 2 is an erbium doped fiber amplifier (Erbium Doped FiberApplication Amplifier, EDFA).
A monitoring module 1 for monitoring the power of each wavelength of light in the first optical signal input to the amplifier 2 to obtain first power data, and transmitting the first power data to the controller 4. Preferably, the monitoring module is an optical channel power monitoring module (Optical Channel Monitor, OCM).
The communication module 3 is configured to acquire and forward second power data of a third optical signal to the controller 4, where the third optical signal is obtained after the second optical signal passes through the transmission link 20, and the second power data includes data of power of each wavelength of light in the third optical signal. Preferably, the communication module 3 is an optical supervisory channel (Optical Supervisory Channel, OSC) module.
Preferably, the transmission link 20 includes optical fibers and optical cables to ensure optical communication, although wires and cables may be included in the transmission link 20 to enable electrical communication. Correspondingly, the communication module 3 may also have communication functions of optical communication, radio communication, wire communication, etc., and the communication module 3 may then also perform optical communication and wire communication via the transmission link 20. In the embodiment of the present invention, the communication module 3 may further acquire and/or transmit the second power data of the third optical signal through optical communication, radio communication, wire communication, or the like. Preferably, the communication module 3 acquires and/or transmits the second power data of the third optical signal via the transmission link 20. Of course, the communication module 3 may also perform other data transmission, including data as to whether the transmission link 20 is faulty, whether the optical power adjustment unit 10 is faulty, and the like.
The controller 4 is respectively connected to the monitoring module 1, the amplifier 2, and the communication module 3, and is configured to calculate a gain tilt adjustment value according to the received first power data and the second power data, so as to adjust the gain flatness of the gain spectrum of the amplifier 2, thereby adjusting the power of each wavelength of light in the second optical signal until the power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold. Preferably, the power of each wavelength of light in the third optical signal reaches the same preset power threshold, that is, the power of the different wavelengths of light in the optical signal reaching the second optical power adjustment unit 10 from the first optical power adjustment unit 10 is substantially uniform, that is, the power of the optical signal is flat.
The power flatness of the multi-wave transmission system is very important, so that all the multi-wave transmission systems must ensure the power flatness of the final received light, and the better the flatness, the higher the signal performance of the receiving end.
The flatness of the power adjustment of the current multi-wave transmission system is realized by adjusting the gain flatness of the amplifier 2 manually or through engineering experience, the adjustment is basically not performed after the initial stage of opening the transmission link, the flatness of the power of the multi-wave transmission system is a dynamic process, such as degradation of the quality of the optical fiber, the change of the transmission power of the transmission end optical module can cause the change of the flatness of the receiving end power, the current multi-wave system can be adjusted only after the initial stage of opening the transmission link, and the subsequent adjustment is little, so that the power flatness cannot be monitored in real time, the best power flatness of the receiving end cannot be guaranteed in real time, and the best performance of the receiving end cannot be guaranteed in real time. The application focuses on guaranteeing the power flatness of the multi-wave system in real time, and the adjusting process is the core of the application.
For example, when transmitting an optical signal containing 40 wavelengths of light, the transmission power of each wavelength of light is the same at the beginning of transmission, and if +4 is assumed, the power of each wavelength of light transmitted through the optical fiber is different because the loss of each wavelength of light is different after the light is transmitted through the transmission link 20, such as the optical fiber, and the general trend is that: the power of the light of the 1 st wavelength is-3, the power of the light of the 2 nd wavelength is-2.5, the power of the light of the 3 rd wavelength is-2..the power of the light of the 39 th wavelength is +5.5, the power of the light of the 40 th wavelength is +6, the specific power of the light of each wavelength obtained after transmission is related to the transmission power and the length of the transmission optical fiber, the monitoring module 1 can read the power of each wavelength of light transmitted through the optical fiber, and then transmit the power data back to the last optical power adjusting unit 10, and after calculation, a set of values are obtained, a straight line is fitted according to the set of values, and the slope of the straight line is calculated.
The output end of the optical power adjusting unit 10 is connected to the input end of the optical fiber, so that in order to ensure that the power of the light of each wavelength in the output end of the optical fiber is equal after the optical signal is transmitted through the optical fiber, the gain spectrum of the amplifier 2 is adjusted at the input end of the optical power adjusting unit 10, so that the power of the light of each wavelength entering the optical fiber is different, for example: the power of the 1 st wavelength light entering the optical fiber is +6, the power of the 2 nd wavelength light is +5.5, the power of the 3 rd wavelength light is +5..the power of the 39 th wavelength light is-2.5, the power of the 40 th wavelength light is-3, which corresponds to a precompensation, the power of each wavelength light in the optical signal output after the optical fiber transmission is about +3, the process is a power equalization process, the amplifier 2 needs to adjust the gain spectrum according to the calculated slope, so as to achieve the flattening of the power, and the slope of the gain spectrum is called the gain flattening of the amplifier 2.
Further, the gain flatness is less than 1dB (decibel). The adjustment of the gain flatness is a dynamic process, and the optimal value is 0dB, but the standard is difficult to reach in practical engineering, and the gain flatness is generally within 1 dB.
The gain tilt adjustment value is the slope of the gain spectrum of the amplifier 2, and since the loss slope of the optical fiber for light with different wavelengths is positive, the slope of the gain spectrum is set to negative, i.e., the unevenness caused by the optical fiber can be offset, for example, if the gain tilt adjustment value is set to-1, the gain of the amplifier 2 for light with the first wavelength is assumed to be 6, the gain for light with the second wavelength is assumed to be 5, and the gain for light with the third wavelength is assumed to be 4.
Referring to fig. 2 to 3, fig. 2 is a linear fitting diagram of power of light with different wavelengths after transmission loss according to a second embodiment of the present invention, and fig. 3 is a linear fitting diagram of gain of an amplifier in an optical power adjustment unit according to a third embodiment of the present invention.
As shown in fig. 2, light with different wavelengths (1520 nm-1570 nm) is transmitted through an optical fiber under the same output power, and then the output optical power is transmitted through the optical fiber, wherein in fig. 2, the horizontal axis, i.e. the x-axis, is the wavelength, and the vertical axis, i.e. the y-axis, is the power of the light with different wavelengths, and a straight line with a positive slope can be obtained through linear fitting, which indicates that the transmission loss of the light with different wavelengths in the optical fiber is different.
In order to counteract this effect, the slope of the gain spectrum of the amplifier 2 is set to be opposite to (i.e. negative of) the slope of the straight line, as shown in fig. 3, the horizontal axis in fig. 3 is the wavelength, the vertical axis is the gain of light with different wavelengths, the slope of the straight line fitted by the gain of the amplifier 2 to the light with different wavelengths is the gain tilt adjustment value of the amplifier 2, the difference of the gain of the light with different wavelengths exactly compensates the transmission loss caused by the different power loss of the light with different wavelengths in the optical fiber, and the flatness of the optical power after the optical fiber transmission can be ensured.
Preferably, the controller 4 is a digital signal processor (DIGITAL SIGNAL Process, DSP) device. In other embodiments, the controller 4 may also be a single chip microcomputer, an FPGA (Field Programmable GateArray ), a PLC (Programmable Logic Controller, programmable logic controller), or the like.
The wavelength values of the light of each wavelength may be sequentially numbered in order from small to large, and the power of the light of the corresponding wavelength may be numbered one by one according to the number of the wavelength values.
The first optical signal passes through the amplifier 2 to obtain a second optical signal, and the second optical signal passes through the transmission link 20 to obtain a third optical signal. In the optical power adjustment unit 10 provided by the present invention, the controller 4 can calculate the power change value before and after the input/output of each wavelength light in the optical signals (without considering the light of the excessive long wavelength caused by the stimulated raman effect), but the power of each wavelength light is changed, the first power data records the power of each wavelength light in the first optical signal, the second power data records the power of each wavelength light in the third optical signal, and the controller 4 can adjust the gain of the amplifier 2 according to the power change value of each wavelength light in the second optical signal until the power of each wavelength light in the third optical signal is substantially equal and the power of each wavelength light in the first optical signal is less than the power of the corresponding wavelength light in the first optical signal by comparing the first power data of the input first optical signal with the second power data of the output third optical signal, thereby equalizing the power of each wavelength light in the optical signal by using the optical power adjustment unit 20 after the input/output of each wavelength light signal is equalized. Regardless of the environment of the transmission link 20, and regardless of the transmission medium of the optical signal included in the transmission link 20, the power balance of the optical signal can be achieved by the feedback mechanism of the optical power adjusting unit 10 as long as the number of wavelengths of light of each wavelength in the optical signal before and after input and output is ensured to be unchanged.
The invention discloses an optical power adjusting unit which comprises a monitoring module, an amplifier, a communication module and a controller. The controller determines a gain tilt adjustment value according to the second power data acquired from the communication module and the first power data acquired from the monitoring module, and adjusts the gain flatness of the gain spectrum of the amplifier based on the gain tilt adjustment value so as to adjust the power of each wavelength of light in the second optical signal until the power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold. The invention not only can quickly and accurately perform power equalization on the optical signals of the multi-wave transmission system, but also can change the gain flatness of the gain spectrum along with the change of the environment of the transmission link, so that the performance of the receiving end is always in the optimal state.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating an operation of an optical power adjustment unit according to a fourth embodiment of the present invention.
Further, as shown in fig. 4, the controller 4 is further configured to transmit, through the communication module 3, power data of the optical signal acquired from the monitoring module 1.
Further, the communication module 3 transmits the power data obtained by detecting the optical signal by the monitoring module 1 in the transmission link 20 by using the fourth optical signal. The operating wavelength range of the fourth optical signal of the communication module 3 does not overlap with the operating wavelength ranges of the first optical signal, the second optical signal, and the third optical signal of the amplifier 2.
The first optical signal, the second optical signal, and the third optical signal belong to optical signals of wavelengths for traffic communication, and the wavelength is generally 1528nm to 1560nm, and the wavelength of the fourth optical signal used by the communication module 3 is generally 1510nm.
When the two optical power adjustment units 10 are connected by the transmission link 20, data transmission is performed between the two communication modules 3 in the two optical power adjustment units 10 by the transmission link 20. In addition, the transmission direction of the fourth optical signal in the transmission link 20 is opposite to the transmission direction of the second optical signal in the same transmission link 20, and because the operating wavelength range of the fourth optical signal of the fourth communication module 3 is not coincident with the operating wavelength ranges of the first optical signal, the second optical signal and the third optical signal of the amplifier 2, the fourth optical signal and the second optical signal will not interfere with each other, and the cable between the two communication modules 3 is avoided to be additionally arranged to realize data transmission, thereby reducing the cost. Therefore, in the invention, the two communication modules 3 in the two optical power adjusting units 10 realize data transmission through the transmission link 20, so that the cost can be reduced, the accuracy rate of data transmission is high, the stability is high, the time delay is low, and the quick feedback can be realized, thereby quickly and accurately carrying out power equalization on the multi-wave transmission system.
Further, the controller 4 is further configured to set the gain tilt adjustment value to a preset adjustment value when the gain tilt adjustment value exceeds an adjustment range, wherein the adjustment range is-2 to 0, and the preset adjustment value is-2.
When light is transmitted in an optical fiber, the energy of the short wavelength light is affected by the stimulated raman effect, and therefore, the power of the short wavelength light after being transmitted through the optical fiber must be smaller than the power of the long wavelength light, in order to compensate for the energy transfer, the power amplification factor of the amplifier 2 for the short wavelength light is higher than the power amplification factor for the long wavelength light, and therefore, the gain slope of the amplifier 2 is not positive, that is, less than 0, and the gain slope adjustment range of the current commercial amplifier 2 is typically at least-2, and thus, the adjustment range is-2 to 0. When the gain slope of the amplifier 2, i.e., the gain tilt adjustment value, is smaller than-2, the gain adjustment value may be set to-2.
Further, determining the gain Tilt adjustment value includes determining the gain Tilt adjustment value tin by the formula:
Tilt＝-SLOP({ΔP1,ΔP2,ΔPi,···,ΔPn},Δλ)×Δλ；
Where Δpi=p outi-Pin i, i=1, 2,..n;
Δλ＝λmax-λmin,1≤max≤n,1≤min≤n,min≤max。
wherein, tilt is a gain Tilt adjustment value, SLOP is a slope obtained by linearly fitting a power difference and a wavelength difference, P in i is a power of light of an ith wavelength in the first optical signal inputted to the amplifier 2, P out i is a power of light of the ith wavelength in the third optical signal outputted from the transmission link 20, Δp1, Δp2, Δ Pi. are power differences obtained by subtracting the power of light of the corresponding wavelength in the first optical signal from the power of light of each wavelength in the third optical signal, λ min is a minimum wavelength value of light in the first optical signal, λ max is a maximum wavelength value of light in the first optical signal, Δλ is a wavelength difference obtained by subtracting the minimum wavelength value from the maximum wavelength value of light in the first optical signal, and n is an arbitrary positive integer.
The definition of the gain Tilt adjustment value Tilt is consistent in the current industry, so that different people can have different calculation methods with the same end result.
For example, in the 40-wavelength optical signal, the wavelength of the first wavelength light is 1526nm, the wavelength of the second wavelength light is 1526.8nm.
-SLOP({ΔP1,ΔP2,ΔPi,···,ΔPn},Δλ)；
The gain Tilt adjustment value tin is the difference between the maximum value and the minimum value at both ends of the fitting straight line, and thus can be expressed as: the product of the slope and the maximum minimum wavelength difference, i.e.:
Tilt＝-SLOP({ΔP1,ΔP2,ΔPi,···,ΔPn},Δλ)×Δλ。
referring to fig. 5, fig. 5 is a schematic structural diagram of an optical power adjusting device according to a fifth embodiment of the present invention.
The second aspect of the present invention provides an optical power adjustment device, as shown in fig. 5, comprising a transmitting end 30, a receiving end 40, at least one transmission link 20 and at least two optical power adjustment units 10 as described above.
The transmitting end 30 and the receiving end 40 are connected through at least one transmission link 20 and at least two optical power adjusting units 10, and any two adjacent optical power adjusting units 10 are connected through one transmission link 20.
A transmitting end 30 for generating and transmitting an optical signal to the first optical power adjusting unit 10.
A receiving end 40 for receiving the optical signal output from the last optical power adjustment unit 10.
The power of the light with the corresponding wavelength in the light signal output by the last light power adjusting unit 10 is adjusted by at least one transmission link 20 and at least two light power adjusting units 10, and the difference value between the power of the light with each wavelength in the light signal input to the first light power adjusting unit 10 is a preset value.
The optical power equalization is completed cooperatively between the two optical power adjusting units 10, if the left side of the first optical power adjusting unit 10 is the transmitting end 30 or the right side of the last optical power adjusting unit 10 is the receiving end 40, then jumper (optical fiber) connection is adopted between the first optical power adjusting unit 10 and the transmitting end 40 and between the last optical power adjusting unit 10 and the receiving end 30, the transmission distance is very short, and the optical fiber has limited power influence on the light of each wavelength, so that in this case, equalization is not required between the first optical power adjusting unit 10 and the transmitting end 40 and between the last optical power adjusting unit 10 and the receiving end 30.
Further, referring to fig. 4, data transmission is performed between two communication modules 3 in two adjacent optical power adjustment units 10 through a transmission link 20 between the two adjacent optical power adjustment units 10.
For example, and in combination with fig. 1 and 4, the optical power conditioning unit 10 comprises an optical channel power monitoring module OCM, an erbium doped fiber amplifier EDFA, a digital signal processor DSP and an optical supervisory channel module OSC, and the transmission link 20 comprises optical fibers.
The optical channel power monitoring module OCM is configured to monitor the power of each wavelength of light in the optical signal at the input point of the optical power adjustment unit 10; the erbium-doped fiber amplifier EDFA is used for amplifying the power of each wavelength of light in the input optical signal; the optical supervisory channel module OSC is used for low-speed communication between the two optical power adjustment units 10, and the digital signal processor DSP is used for calculating a gain tilt adjustment value to adjust the power of each wavelength of light in the output optical signal by the erbium-doped fiber amplifier EDFA.
The optical signals with multiple wavelengths are input from a first optical power adjusting unit 10, and a first optical channel power monitoring module OCM records the power of each wavelength of light at a first input point; the power of each wavelength light in the input optical signal is amplified by the first erbium-doped fiber amplifier EDFA, and is received by the second optical power adjusting unit 10 after being transmitted by the optical fiber; the second optical channel power monitoring module OCM monitors the power of each wavelength of light at the second input point and transmits the power information of the optical signal to the first optical monitoring channel module OSC through the second optical monitoring channel module OSC; the first optical supervisory channel module OSC compares and calculates the power information of the received optical signal with the power information of the input optical signal recorded by the first optical channel power supervisory module OCM, and adjusts the gain spectrum of the first erbium-doped fiber amplifier EDFA according to the calculation result, so that the power of the input multi-wavelength optical signal of the second optical power adjusting unit 10 is flat.
The calculation step of the gain Tilt adjustment value Tilt is as follows:
(1) Recording a wavelength value lambda 1、λ2、λ3....λn of each wave of the input signal light;
(2) Recording the power P in1、Pin2、Pin3....Pin n of each wavelength of light at the first input point of the first optical power adjustment unit 10, and recording the power P out1、Pout2、Pout3....Pout n of each wavelength of light at the second input point of the second optical power adjustment unit 10;
(3) Subtracting the power of the light with the corresponding wavelength at the second input point from the power of the light with the corresponding wavelength at the first input point to obtain a power difference value of the light with each wavelength:
{ΔP1,ΔP2,ΔP3,···,ΔPn}＝{Pout1-Pin1,Pout2-Pin2,Pout3-Pin3,···,Poutn-Pinn}
Preferably, the wavelength values are numbered sequentially from smaller to larger. Subtracting the maximum wavelength value and the minimum wavelength value of the input optical signal to obtain a wavelength difference value:
Δλ＝λn-λ1；
(4) The gain Tilt adjustment value tin may be determined as follows:
Tilt＝-SLOP({ΔP1,ΔP2,ΔP3,···,ΔPn},Δλ)×Δλ；
wherein SLOP is the slope of the power difference and the wavelength difference after linear fitting.
The gain adjustment process is automatically completed through mutual feedback of the first optical power adjustment unit 10 and the second optical power adjustment unit 10, and the gain flatness at the second input point of the adjusted second optical power adjustment unit 10 is less than 1dB.
The calculation of the gain Tilt adjustment value Tilt is all done in the first optical power adjustment unit 10 by a digital signal processor DSP.
The optical channel power monitoring module OCM, the erbium doped fiber amplifier EDFA and the optical monitoring channel module OSC communicate with each other inside the optical power conditioning unit 10 and report monitoring data to the digital signal processor DSP in real time.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an optical power adjustment system according to a sixth embodiment of the present invention.
A third aspect of the present invention provides an optical power adjustment system, as shown in fig. 6, comprising at least two optical power adjustment devices as described above, the optical signal transmission directions of the at least two optical power adjustment devices being opposite. The structure, working principle and beneficial effects of the optical power adjusting system are the same as those of the optical power adjusting unit 10 provided in the first aspect and the optical power adjusting device provided in the second aspect, and are not described here again.
A fourth aspect of the present invention provides a method of adjusting optical power, the method comprising:
First power data of a first optical signal of the amplifier 2 in the input optical power adjustment unit 10 is monitored and acquired, wherein the first power data includes data of power of light of each wavelength in the first optical signal.
And acquiring second power data of a third optical signal, wherein the third optical signal is obtained after the second optical signal passes through the transmission link 20, the second optical signal is obtained after the first optical signal passes through the amplifier 2 to amplify the power of the light, and the second power data comprises data of the power of each wavelength of the light in the third optical signal.
A gain tilt adjustment value is determined from the first power data and the second power data, and the gain flatness of the gain spectrum of the amplifier 2 is adjusted based on the gain tilt adjustment value so as to adjust the power of each wavelength of light in the second optical signal until the power of each wavelength of light in the third optical signal in the received second power data reaches a preset power threshold. Preferably, the power of each wavelength of light in the third optical signal reaches the same preset power threshold, that is, the power of the different wavelengths of light in the optical signal reaching the second optical power adjustment unit 10 from the first optical power adjustment unit 10 is substantially uniform, that is, the power of the optical signal is flat.
Further, the step of calculating the gain tilt adjustment value according to the first power data and the second power data further includes:
And when the gain inclination adjusting value exceeds the adjusting range, setting the gain inclination adjusting value to be a preset adjusting value, wherein the adjusting range is-2 to 0, and the preset adjusting value is-2.
Further, the gain flatness is less than 1dB.
Further, the calculation formula of the gain tilt adjustment value is as follows:
Tilt＝-SLOP({ΔP1,ΔP2,ΔPi,···,ΔPn},Δλ)×Δλ；
Where Δpi=p outi-Pin i, i=1, 2,..n;
Δλ＝λmax-λmin,1≤max≤n,1≤min≤n,min≤max。
Wherein Tilt is a gain Tilt adjustment value, SLOP is a slope obtained by linearly fitting a power difference and a wavelength difference, P in1、Pin2、Pini....Pin n is a power of light of each wavelength in the first optical signal inputted to the amplifier 2, P out1、Pout2、Pouti....Pout n is a power of light of a corresponding wavelength in the third optical signal outputted from the transmission link 20, Δp1, Δp2, Δ Pi. are power differences obtained by subtracting a power of light of a corresponding wavelength in the first optical signal from a power of light of each wavelength in the third optical signal, λ min is a minimum wavelength value of light in the first optical signal, λ max is a maximum wavelength value of light in the first optical signal, Δλ is a wavelength difference obtained by subtracting the minimum wavelength value from the maximum wavelength value of light in the first optical signal, and n is any positive integer.
The invention discloses an optical power adjusting method, which is used for determining a gain tilt adjusting value according to acquired second power data and first power data, and adjusting the gain flatness of a gain spectrum of an amplifier based on the gain tilt adjusting value so as to adjust the power of light of each wavelength in a second optical signal until the power of light of each wavelength in a third optical signal in the received second power data reaches a preset power threshold. The invention not only can quickly and accurately perform power equalization on the optical signals of the multi-wave transmission system, but also can change the gain flatness of the gain spectrum along with the change of the environment of the transmission link, so that the performance of the receiving end is always in the optimal state.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments. The foregoing is a description of the optical power adjustment unit, apparatus, system and method provided by the present invention, and it should be understood that the present invention is not limited thereto, since modifications may be made by those skilled in the art in light of the present teachings.
Claims (8)
1. An optical power adjusting unit is characterized by comprising a monitoring module, an amplifier, a communication module and a controller; the monitoring module, the amplifier and the communication module are in communication connection with the controller;
The amplifier is used for amplifying the optical power of each wavelength in the input first optical signal respectively according to a gain spectrum to obtain a second optical signal with a corresponding wavelength and then outputting the second optical signal, wherein the gain spectrum is determined by a gain inclination adjustment value obtained by the controller;
the monitoring module is configured to monitor first power data of the first optical signal, and send the first power data to the controller, where the first power data includes optical power data of each wavelength in the first optical signal;
the communication module is configured to acquire and forward second power data to the controller, where the second power data includes optical power data of each wavelength in a third optical signal, where the third optical signal is obtained after the second optical signal passes through a transmission link;
The controller is configured to determine a gain tilt adjustment value according to the received first power data and the second power data, and adjust gain flatness of a gain spectrum of the amplifier based on the gain tilt adjustment value, so as to adjust optical power of each wavelength in the second optical signal, until the optical power of each wavelength in the received third optical signal reaches a preset power threshold value, so as to achieve power flatness of each wavelength; wherein: the gain tilt adjustment value is determined by the following equation:
Tilt＝-SLOP({△P1,△P2,△Pi,…,△Pn},△λ)×△λ；
Wherein Δpi=p outi-Pin i, i=1, 2,..n;
△λ＝λmax-λmin,1≤max≤n,1≤min≤n,min≤max；
Wherein, tin is the gain Tilt adjustment value, SLOP is the slope obtained by linearly fitting the power difference and the wavelength difference, P in i is the optical power of the ith wavelength in the first optical signal input to the amplifier, P out i is the optical power of the ith wavelength in the third optical signal output from the transmission link, Δp1, Δp2, Δ Pi. are the power difference obtained by subtracting the optical power of the corresponding wavelength in the first optical signal from the optical power of each wavelength in the third optical signal, λ min is the minimum wavelength value of the light in the first optical signal, λ max is the maximum wavelength value of the light in the first optical signal, Δλ is the wavelength difference obtained by subtracting the minimum wavelength value from the maximum wavelength value of the light in the first optical signal, and n is any positive integer.
2. The optical power conditioning unit of claim 1 wherein the communication module is further configured to transmit power data of the optical signal acquired from the monitoring module.
3. The optical power adjustment unit according to claim 2, wherein the communication module transmits the power data obtained by detecting the optical signal by the monitoring module in the transmission link by using a fourth optical signal, and an operating wavelength range of the fourth optical signal of the communication module is not coincident with an operating wavelength range of the first optical signal, the second optical signal, and the third optical signal of the amplifier.
4. The optical power adjustment unit according to claim 3, wherein the controller is further configured to set the gain tilt adjustment value to a preset adjustment value when the gain tilt adjustment value is out of an adjustment range.
5. An optical power adjustment device, characterized in that the device comprises a transmitting end, a receiving end, at least one transmission link and at least two optical power adjustment units according to any of claims 1-4;
The transmitting end and the receiving end are connected through at least one transmission link and at least two optical power adjusting units, and two adjacent optical power adjusting units are connected through one transmission link;
the transmitting end is used for generating and transmitting an optical signal to the first optical power adjusting unit;
the receiving end is used for receiving the optical signal output by the last optical power adjusting unit;
And the difference value between the optical power of each wavelength in the optical signal output by the last optical power adjusting unit and the optical power of the corresponding wavelength in the optical signal input to the first optical power adjusting unit is a preset value after being adjusted by the at least one transmission link and the at least two optical power adjusting units.
6. The optical power adjustment device according to claim 5, wherein data transmission is performed between two of the communication modules in two adjacent optical power adjustment units through the transmission link between the two adjacent optical power adjustment units.
7. An optical power adjustment system, characterized in that the system comprises at least two optical power adjustment devices according to any of claims 5-6, the optical signal transmission directions of at least two of said optical power adjustment devices being opposite.
8. A method of optical power adjustment, the method comprising:
Monitoring and acquiring first power data of a first optical signal of an amplifier in an input optical power adjusting unit, wherein the first power data comprises optical power data of each wavelength in the first optical signal;
Acquiring second power data of a third optical signal, wherein the third optical signal is obtained after a second optical signal passes through a transmission link, the second optical signal is obtained after the first optical signal passes through the amplifier, and the second power data comprises optical power data of each wavelength in the third optical signal;
Determining a gain tilt adjustment value according to the first power data and the second power data, and adjusting the gain flatness of the gain spectrum of the amplifier based on the gain tilt adjustment value so as to adjust the optical power of each wavelength in the second optical signal until the optical power of each wavelength in the third optical signal in the received second power data reaches a preset power threshold value, thereby realizing the power flatness of each wavelength; wherein the gain tilt adjustment value is determined by the following formula:
Tilt＝-SLOP({△P1,△P2,△Pi,…,△Pn},△λ)×△λ；
Wherein Δpi=p outi-Pin i, i=1, 2,..n;
△λ＝λmax-λmin,1≤max≤n,1≤min≤n,min≤max；
Wherein, tin is the gain Tilt adjustment value, SLOP is the slope obtained by linearly fitting the power difference and the wavelength difference, P in i is the optical power of the ith wavelength in the first optical signal input to the amplifier, P out i is the optical power of the ith wavelength in the third optical signal output from the transmission link, Δp1, Δp2, Δ Pi. are the power difference obtained by subtracting the optical power of the corresponding wavelength in the first optical signal from the optical power of each wavelength in the third optical signal, λ min is the minimum wavelength value of the light in the first optical signal, λ max is the maximum wavelength value of the light in the first optical signal, Δλ is the wavelength difference obtained by subtracting the minimum wavelength value from the maximum wavelength value of the light in the first optical signal, and n is any positive integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110959911.7A CN113691346B (en) | 2021-08-20 | 2021-08-20 | Optical power adjusting unit, device, system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110959911.7A CN113691346B (en) | 2021-08-20 | 2021-08-20 | Optical power adjusting unit, device, system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113691346A CN113691346A (en) | 2021-11-23 |
| CN113691346B true CN113691346B (en) | 2024-05-17 |
Family
ID=78581146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110959911.7A Active CN113691346B (en) | 2021-08-20 | 2021-08-20 | Optical power adjusting unit, device, system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113691346B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116896410B (en) * | 2023-08-14 | 2024-02-13 | 大庆亿莱检验检测技术服务有限公司 | Optical fiber relay signal monitoring and transmitting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193752A (en) * | 1997-03-13 | 1998-09-23 | 富士通株式会社 | Remotely pumping type multi-wavelength light transmission system |
| JP2004112437A (en) * | 2002-09-19 | 2004-04-08 | Nec Corp | Gain equalizer and wdm optical relay system |
| CN1588828A (en) * | 2004-10-25 | 2005-03-02 | 烽火通信科技股份有限公司 | Light relay station device for light transmission, system and its automatic fain regulating method |
| CN105812065A (en) * | 2014-12-31 | 2016-07-27 | 中兴通讯股份有限公司 | Automatic power adjusting method and device in optical fiber communication system |
-
2021
- 2021-08-20 CN CN202110959911.7A patent/CN113691346B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193752A (en) * | 1997-03-13 | 1998-09-23 | 富士通株式会社 | Remotely pumping type multi-wavelength light transmission system |
| JP2004112437A (en) * | 2002-09-19 | 2004-04-08 | Nec Corp | Gain equalizer and wdm optical relay system |
| CN1588828A (en) * | 2004-10-25 | 2005-03-02 | 烽火通信科技股份有限公司 | Light relay station device for light transmission, system and its automatic fain regulating method |
| CN105812065A (en) * | 2014-12-31 | 2016-07-27 | 中兴通讯股份有限公司 | Automatic power adjusting method and device in optical fiber communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113691346A (en) | 2021-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6738184B2 (en) | Optical amplifier for amplifying multi-wavelength light | |
| US7085043B2 (en) | Optical amplifier | |
| US6433925B1 (en) | Optical fiber amplifier and optical transmission system using the same | |
| US8670176B2 (en) | Optical amplifying device | |
| US20080074731A1 (en) | Optical amplifier and method of controlling the same | |
| JP4476333B2 (en) | Optical amplification apparatus and control method | |
| US20040240042A1 (en) | Optical amplifier, communication system and method for control tilt of a communication system | |
| CN113691346B (en) | Optical power adjusting unit, device, system and method | |
| US7388711B2 (en) | Controlling apparatus for optical amplifier and controlling method thereof | |
| US7145718B2 (en) | Control method of optical fiber amplifier and optical transmission system | |
| US6683713B2 (en) | Method, device, and system for level equalization | |
| US20050152693A1 (en) | Method for per-channnel power control in a DWDM network by means of an algorithm for adjusting the power of a dummy signal and the input power of an optical amplifier via channel-average Q-factor measurement | |
| US7139117B2 (en) | Optical transmission apparatus | |
| JP4122884B2 (en) | Optical repeater | |
| US6404527B1 (en) | Method and apparatus for transmitting a response signal from an optical repeater to a terminal requesting status information | |
| JP2001168841A (en) | Wavelength multiplex optical amplifier | |
| JPWO2003079584A1 (en) | Method and system for optical fiber transmission using Raman amplification | |
| JP4079424B2 (en) | Optical fiber amplifier and optical transmission system | |
| US6721091B2 (en) | System and method for controlling optical amplifier pumps | |
| US7068422B2 (en) | Optical fiber amplification method and apparatus for controlling gain | |
| JP2009164565A (en) | Gain equalizer, optical amplifier, and optical amplification method | |
| US6532103B1 (en) | Optical fiber amplifier and optical transmission system using the same | |
| JP2000031916A (en) | Gain equalizer and optical amplification transmission line | |
| JP4312577B2 (en) | Optical fiber amplifier | |
| JP2003348017A (en) | Variable gain equalizer and method for monitoring remote control gain equalization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |