CN108512596A - OSNR computational methods for cascading image intensifer communication system and device - Google Patents
OSNR computational methods for cascading image intensifer communication system and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/2933—Signal power control considering the whole optical path
- H04B10/2935—Signal power control considering the whole optical path with a cascade of amplifiers
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Abstract
The invention discloses a kind of OSNR computational methods and device for cascading image intensifer communication system, are related to technical field of optical fiber communication.This method includes：Using the gain coefficient of image intensifers at different levels, each section of optical fiber attenuation, the net gain of image intensifer fiber segments at different levels is calculated；Each channel signal light power at different levels is calculated using the gain slope of signal light power, image intensifer at different levels after channel number, channel spacing, centre frequency Channel Modulation, and in conjunction with net gain；According to every grade of noise of optical amplifier coefficient, binding signal luminous power calculates the equivalent OSNR costs of link；According to input terminal OSNR output end OSNR is calculated in conjunction with equivalent OSNR costs.The device includes net gain computing module, signal light power computing module, equivalent OSNR costs computing module and target OSNR computing modules.The present invention can effectively solve the problems, such as that measurement accuracy is inadequate in traditional OSNR computational methods, unstable, hardware cost is high and complexity is high.
Description
Technical field
The present invention relates to technical field of optical fiber communication, are specifically a kind of for cascading image intensifer communication system
OSNR (Optical Signal Noise Ratio, optical signal to noise ratio) computational methods and device.
Background technology
With the high speed development of Novel Internet business, number of users and data volume increase rapidly, to network capacity bandwidth
Demand also increasingly promoted.Optic communication Backbone Transport rate is promoted to Tbit/s magnitudes, and channel spacing is also gradually from 100GHz
It is even lower to be transitioned into 50GHz.The complexity of network is continuously increased, in order to provide reliable and stable service, to signal transmission matter
The performance detection of amount is with regard to particularly important.Important parameters one of of the OSNR as reflection photosphere performance and communication quality, it is accurate to need
Ground is detected it.
The key of OSNR detection techniques is correct measurement signal light power and noise luminous power, or according to other and OSNR
There is the parameter of definite relationship (such as electric Signal to Noise Ratio (SNR)) to be calculated.Traditional OSNR computational methods mainly have OSA
(Optical Spectrum Analysis, spectrum analysis) band extrapolated value method, polarization return-to-zero method and light delay interferometry etc..
Wherein, OSA with extrapolated value method be obtain spectrum to scan using narrowband tunable optical filter and estimate OSNR, but
The problem of being due to OSA resolution bandwidths, if DWDM (Dense Wavelength Division Multiplexing, it is intensive
Type light wave is multiplexed) filter has been used in system, along with the ever-increasing number of channel and ever-reduced channel spacing, tradition
OSA band extrapolated value method cannot correctly estimate OSNR.And for polarizing return-to-zero method, when signal depolarizes (PMD-
Polarization Mode Dispersion, polarization mode dispersion or nonlinear birefringence cause) or ASE (Amplified
Spontaneous emission, amplified spontaneous emission) noise producing part polarization (PDL-Polarization Dependent
Loss, Polarization Dependent Loss and PDG-Polarization Dependent Gain Polarization-Dependent Gains cause) when, measurement
Precision can be by strong influence.And for light delay interferometry, then it needs to introduce delay line device so that hardware cost is high
It is high, and can occur fixed unstable phenomenon with environmental change, it is not easy to observation and operation.
Invention content
The purpose of the invention is to overcome the shortcomings of above-mentioned background technology, provide a kind of for cascading image intensifer communication
The OSNR computational methods and device of system, can effectively solve that measurement accuracy in traditional OSNR computational methods is inadequate, unstable, hardware
The with high costs and high problem of complexity.
To achieve the above objectives, the present invention provides a kind of OSNR computational methods for cascading image intensifer communication system,
Include the following steps：S1, the gain coefficient using image intensifers at different levels, each section of optical fiber attenuation, calculate image intensifer-optical fiber at different levels
The net gain of section；S2, the signal light power using after channel number, channel spacing, centre frequency Channel Modulation, light amplification at different levels
The gain slope of device, and the net gain of image intensifer-fiber segments at different levels obtained by S1 is combined, calculate the signal of each every grade of channel
Luminous power；S3, according to every grade of noise of optical amplifier coefficient, the signal light power of each every grade of channel in conjunction with obtained by S2, calculate
The equivalent OSNR costs of link；S4, according to determining input terminal OSNR, the equivalent OSNR costs in conjunction with obtained by S3, calculate output
Hold OSNR.
Based on the above technical solution, upon step s 2, further include following operation：The each letter that will be calculated
The signal light power in every grade of road is compared with actually measured luminous power, if the two gap is more than specified threshold, is judged in link
It breaks down.
Based on the above technical solution, it in step S1, is declined using the gain coefficient of image intensifers at different levels, each section of optical fiber
Subtract, when calculating the net gain of image intensifer-fiber segments at different levels, is calculated using following formula：
Δj=Gj*Lj
Wherein, ΔjIndicate the net gain of j-th stage image intensifer-fiber segment, j ∈ [1, N]；N indicates the total grade of image intensifer
Number, for the positive integer more than 1；GjIndicate the gain coefficient of j-th stage image intensifer, LjIndicate jth section optical fiber attenuation.
Based on the above technical solution, step S2 specifically includes following operation：
1) centre frequency for determining image intensifer utilizes the signal light power after the centre frequency Channel Modulation
And combine the net gain Δ of calculated image intensifer-fiber segments at different levels in S1j, centre frequency channel is calculated step by step in light at different levels
The signal light power of amplifierIts calculation formula is：
Wherein, i0Indicate that centre frequency channel number, j indicate j-th stage image intensifer；
2) determine channel number Ch, using calculated centre frequency channel image intensifers at different levels signal light powerThe gain slope of channel spacing and image intensifer at different levels calculates the signal light power of each every grade of channel
Pin_e(i, j), calculation formula is：
Wherein, i indicates the i-th channel, i ∈ [1, Ch]；GTjIndicate the gain slope of j-th stage image intensifer；B indicates channel
Interval.
Based on the above technical solution, step S3 specifically includes following operation：
1) according to every grade of noise of optical amplifier coefficient, the signal light power Pin_ of each every grade of channel in conjunction with obtained by S2
e(i, j)Calculate k(i, j), the k(i, j)For the influence of the i-th channel of noise characteristic pair OSNR of j-th stage image intensifer, calculate public
Formula is：
Wherein, FjIndicate j-th stage noise of optical amplifier coefficient；
2) k of image intensifers at different levels is accumulated(i, j)It is inverted afterwards, calculate the equivalent OSNR costs OSNR of entire linklink,
Its calculation formula is：
Wherein, N1 indicates that N1 grades of image intensifers, N2 indicate N2 grades of amplifiers；When calculating from the 1st grade to the tired of j-th stage
The k of product image intensifer(i, j), then N1=1, N2=j, and so on.
Based on the above technical solution, equivalent in conjunction with obtained by S3 according to determining input terminal OSNR in step S4
OSNR costs are calculated when calculating output end OSNR using following formula：
Wherein, OSNRinFor input terminal OSNR, OSNRlinkFor the equivalent OSNR costs obtained by S3, OSNRoutFor output end
OSNR。
Based on the above technical solution, the image intensifer is EDFA Erbium-Doped Fiber Amplifier EDFA.
Based on the above technical solution, the cascade image intensifer communication system includes laser light source, optical modulator
And N number of cascade image intensifer；The optical modulator is connected to the output end of laser light source, is sent out for modulating laser light source
Optical signal；It is connected between N number of cascade image intensifer by being used for transmission the optical fiber of optical signal, and first order light amplification
Device is connected to the output end of optical modulator, and the modulated optical signal for exporting optical modulator exports after being amplified, N grades of light
Amplifier is connected to the output end of optical fiber, for will be exported after the optical signal amplification after transmission.
The present invention also provides it is a kind of realize the above method for cascading the OSNR computing devices of image intensifer communication system,
The device includes net gain computing module, signal light power computing module, equivalent OSNR costs computing module and target OSNR meters
Calculate module；
The net gain computing module is used for：Using the gain coefficient of image intensifers at different levels, each section of optical fiber attenuation, calculate each
The net gain of grade image intensifer-fiber segment；
The signal light power computing module is used for：After channel number, channel spacing, centre frequency Channel Modulation
The gain slope of signal light power, image intensifer at different levels, and the image intensifers-at different levels in conjunction with obtained by the net gain computing module
The net gain of fiber segment calculates the signal light power of each every grade of channel；
The equivalent OSNR costs computing module is used for：According to every grade of noise of optical amplifier coefficient, in conjunction with the signal light
The signal light power of each every grade of channel obtained by power computation module calculates the equivalent OSNR costs of link；
The target OSNR computing modules are used for：According to determining input terminal OSNR, in conjunction with the equivalent OSNR costs meter
The equivalent OSNR costs obtained by module are calculated, output end OSNR is calculated.
Based on the above technical solution, which further includes fault detection module, which is used for：It will
The signal light power for each every grade of channel that the signal light power computing module is calculated and actually measured luminous power pair
Than if the two gap is more than specified threshold, judging to break down in link.
The beneficial effects of the present invention are：
(1) it the present invention is based on the analysis of EDFA links, is counted by the noise characteristic of image intensifer and the operating condition of amplification
OSNR is calculated, it is found that the OSNR costs in link are only related to the characteristic of image intensifer and optical fiber, and to other devices of sending and receiving end
And structure does not require, and can independently calculate.Therefore, the present invention is merely with channel number, channel spacing, modulated signal light
Power, the parameters such as gain coefficient, gain slope and the noise coefficient of image intensifer go out the defeated of entire link to calculate step by step calculation
Go out OSNR.Compared with prior art, high certainty of measurement, stability are good, hardware cost is low, complexity is low, and are passed to following light
The design of defeated system has the certain significance.
(2) present invention is in the signal light power Pin_e that each every grade of channel is calculated(i, j)Afterwards, it can will be calculated
Pin_e(i, j)With actually measured luminous power Pin(i, j)Comparison, if Pin_e(i, j)With Pin(i, j)Gap is excessive, then shows in link
There is failure.By aforesaid operations, it can be achieved that making quick detection with the presence or absence of failure in link, actual use is met
Demand.
(3) various high speeds, flexible optical fiber telecommunications system are present invention can be suitably applied to, use scope is wide, can meet various make
With the demand of environment.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of typical cascade image intensifer communication system；
Fig. 2 is the flow chart of the OSNR computational methods for cascading image intensifer communication system in the embodiment of the present invention；
Fig. 3 is the structure diagram of the OSNR computing devices for cascading image intensifer communication system in the embodiment of the present invention；
Fig. 4 is another structural frames of the OSNR computing devices for cascading image intensifer communication system in the embodiment of the present invention
Figure；
Fig. 5 is the schematic diagram of every grade of light amplifier gain and optical fiber link loss in simulation example；
Fig. 6 is the schematic diagram for the signal light power that channels at different levels enter EDFA at different levels in simulation example；
Fig. 7 is the schematic diagram of the k reciprocal of the OSNR costs of different channels EDFA at different levels in simulation example；
Fig. 8 is the schematic diagram that gained OSNR is calculated in simulation example；
Fig. 9 is the difference schematic diagram that gained OSNR and simulated measurement OSNR is calculated in simulation example.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
The mentality of designing of the present invention is to provide a kind of OSNR numerical procedures for cascading image intensifer communication system.Its
In, the cascade image intensifer communication system is as shown in Figure 1, include laser light source, optical modulator and N number of cascade light amplification
Device, N are the positive integer more than 1.Wherein, optical modulator is connected to the output end of laser light source, is sent out for modulating laser light source
Optical signal；It is connected between N number of cascade image intensifer by being used for transmission the optical fiber of optical signal, and first order image intensifer connects
It is connected to the output end of optical modulator, the modulated optical signal for exporting optical modulator exports after being amplified, N grades of light amplification
Device is connected to the output end of optical fiber, for will be exported after the optical signal amplification after transmission.
It is understood that in cascading image intensifer communication system, such as cascade EDFAs (Erbium-doped
Optical Fiber Amplifier, erbium-doped fiber amplifier) dwdm system in, the decline of OSNR performances is mainly by each
Caused by the ASE noises of grade EDFA accumulation.In link transmission, the decaying of signal light power can be compensated by image intensifer, but be made an uproar
Sound is similarly compensated.It being continuously increased with the series of image intensifer, each image intensifer can introduce new ASE noises again,
Constantly decline so as to cause OSNR.Therefore, OSNR can directly by calculate every grade of image intensifer output signal luminous power with
The ratio between ASE noise powers of generation obtain.Wherein, output signal luminous power is increased by input signal light power and image intensifer
Benefit, link load calculate；And ASE noise powers can then increase by degrees to accumulate along transmission link and calculate.
Based on above-mentioned mentality of designing, the present invention provides a kind of calculating sides OSNR for cascading image intensifer communication system
Case, merely with channel number, channel spacing, modulated signal light general power, the gain coefficient of image intensifer, gain slope and
Whether noise coefficient, link load and image intensifer number etc. can calculate the OSNR of output, and can detect in link to go out
Existing failure, and complexity is low, using conveniently, is suitable for high speed, flexible optical fiber telecommunications system.
In order to better understand the above technical scheme, below in conjunction with Figure of description and specific embodiment to above-mentioned
Technical solution is described in detail.
Embodiment one
It is shown in Figure 2, a kind of OSNR computational methods for cascading image intensifer communication system are present embodiments provided,
This approach includes the following steps：
Step S1, using the gain coefficient of image intensifers at different levels, each section of optical fiber attenuation, image intensifer-optical fiber at different levels are calculated
The net gain of section.In specific implementation process, the image intensifer is EDFA Erbium-Doped Fiber Amplifier EDFA.
Step S2, it is put using the signal light power after channel number, channel spacing, centre frequency Channel Modulation, light at different levels
The gain slope of big device, and the net gain of image intensifer-fiber segments at different levels obtained by S1 is combined, calculate the letter of each every grade of channel
Number luminous power.
Step S3, according to every grade of noise of optical amplifier coefficient, the signal light power of each every grade of channel in conjunction with obtained by S2,
Calculate the equivalent OSNR costs of link.
Step S4, according to determining input terminal OSNR, the equivalent OSNR costs in conjunction with obtained by S3 calculate output end OSNR,
Finally obtain the OSNR of target.
Embodiment two
It is provided in this embodiment a kind of for cascading the OSNR computational methods of image intensifer communication system, basic step with
Embodiment one is identical, the difference is that：In the step S1 of this method, the gain coefficient of image intensifers at different levels, each section of light are utilized
Fibre decaying, when calculating the net gain of image intensifer-fiber segments at different levels, is calculated using following formula：
Δj=Gj*Lj (1)
Wherein, ΔjIndicate that the net gain of j-th stage image intensifer-fiber segment, j ∈ [1, N], N are the total series of image intensifer；Gj
Indicate the gain coefficient of j-th stage image intensifer, LjIndicate jth section optical fiber attenuation.
Embodiment three
It is provided in this embodiment a kind of for cascading the OSNR computational methods of image intensifer communication system, basic step with
Embodiment one is identical, the difference is that：The step S2 of this method specifically includes following operation：
1) centre frequency for determining image intensifer utilizes the signal light power after the centre frequency Channel Modulation
And combine the net gain Δ of calculated image intensifer-fiber segments at different levels in S1jCentre frequency channel is calculated step by step in light at different levels
The signal light power of amplifierIts calculation formula is：
Wherein, i0Indicate that centre frequency channel number, j indicate j-th stage image intensifer；
2) determine channel number Ch, using calculated centre frequency channel image intensifers at different levels signal light powerThe gain slope of channel spacing and image intensifer at different levels calculates the signal light power of each every grade of channel
Pin_e(i, j), calculation formula is：
Wherein, i indicates the i-th channel, i ∈ [1, Ch]；GTjIndicate the gain slope of j-th stage image intensifer；B indicates channel
Interval.
In specific implementation process, in the signal light power Pin_e that each every grade of channel is calculated(i, j)Afterwards, it can will count
Obtained Pin_e(i, j)With actually measured luminous power Pin_e(i, j)Comparison, if Pin_e(i, j)With Pin_e(i, j)Gap is more than
Specified threshold (specified threshold by tension management interface or software can be artificially arranged), then show occur in link
Failure；If the two is almost the same, can continue to calculate OSNR by step S3.It follows that by aforesaid operations, it can be achieved that
To making detection with the presence or absence of failure in link, can meet the actual needs.
Example IV
It is provided in this embodiment a kind of for cascading the OSNR computational methods of image intensifer communication system, basic step with
Embodiment one is identical, the difference is that：The step S3 of this method specifically includes following operation：
1) according to every grade of noise of optical amplifier coefficient, the signal light power Pin_ of each every grade of channel in conjunction with obtained by S2
e(i, j)Calculate k(i, j), the k(i, j)The influence of the i-th channel of noise characteristic pair OSNR of j-th stage image intensifer is reflected, is calculated
Formula is：
Wherein, FjIndicate j-th stage noise of optical amplifier coefficient；
2) k of image intensifers at different levels is accumulated(i, j)It is inverted afterwards, calculate the influence OSNR of entire link pair OSNRlink, i.e.,
The equivalent OSNR costs OSNR of linklink, calculation formula is：
Wherein, N1 indicates that N1 grades of image intensifers, N2 indicate N2 grades of amplifiers；When calculating from the 1st grade to the tired of j-th stage
The k of product image intensifer(i, j), then N1=1, N2=j, and so on.
Embodiment five
It is provided in this embodiment a kind of for cascading the OSNR computational methods of image intensifer communication system, basic step with
Embodiment one is identical, the difference is that：In the step S4 of this method, according to determining input terminal OSNR, in conjunction with obtained by S3
Equivalent OSNR costs are calculated when calculating output end OSNR using following formula：
Wherein, OSNRinFor input terminal OSNR, OSNRlinkFor the equivalent OSNR costs obtained by S3, OSNRoutFor output end
OSNR。
Embodiment six
It is provided in this embodiment a kind of for cascading the OSNR computational methods of image intensifer communication system, basic step with
Embodiment one is identical, the difference is that：This method has also combined embodiment two to all features of embodiment five.It is specific next
It says, this approach includes the following steps：
S1, the gain coefficient G for determining image intensifers at different levelsjWith each section of optical fiber attenuation Lj, light at different levels are calculated according to formula (1)
The net gain Δ of amplifier-fiber segmentj。
S2, the centre frequency for determining image intensifer utilize the signal light power after the centre frequency Channel ModulationAnd in S1 calculated image intensifer-fiber segments at different levels net gain Δj, center is calculated according to formula (2) step by step
Signal light power of the frequency channels in image intensifers at different levelsIt determines channel number Ch, utilizes calculated center
Signal light power of the frequency channels in image intensifers at different levelsThe gain of channel spacing B and image intensifer at different levels
Slope GTj, the signal light power Pin_e of each every grade of channel is calculated according to formula (3)(i, j).At the same time, moreover it is possible to will calculate
The Pin_e gone out(i, j)With actually measured luminous power Pin(i, j)Comparison, it is known that whether there is failure in link.
S3, every grade of noise of optical amplifier coefficient F is determinedj, the Pin in conjunction with obtained by S2(i, j), k is calculated according to formula (4)(i, j),
It reflects the influence of the i-th channel of noise characteristic pair OSNR of j-th stage EDFA；Further according to formula (5), image intensifers at different levels are accumulated
K(i, j)It is inverted afterwards, calculate the equivalent OSNR costs OSNR of entire linklink。
S4, according to determining input terminal OSNR, i.e. OSNRin(infinity is usually defaulted as after optical modulator), in conjunction with
OSNR obtained by S3link, output end OSNR, i.e. OSNR are calculated according to formula (6)out, obtain final target OSNR.
Embodiment seven
Shown in Figure 3 based on same inventive concept, the embodiment of the present invention additionally provides a kind of use for realizing the above method
In the OSNR computing devices of cascade image intensifer communication system.The device includes net gain computing module, signal light power calculating
Module, equivalent OSNR costs computing module and target OSNR computing modules；Wherein：
Net gain computing module is used for：Using the gain coefficient of image intensifers at different levels, each section of optical fiber attenuation, light at different levels are calculated
The net gain of amplifier-fiber segment；
Signal light power computing module is used for：Utilize the signal after channel number, channel spacing, centre frequency Channel Modulation
The gain slope of luminous power, image intensifer at different levels, and image intensifer-optical fiber at different levels in conjunction with obtained by the net gain computing module
The net gain of section, calculates the signal light power of each every grade of channel；
Equivalent OSNR costs computing module is used for：According to every grade of noise of optical amplifier coefficient, in conjunction with the signal light power
The signal light power of each every grade of channel obtained by computing module calculates the equivalent OSNR costs of link；
Target OSNR computing modules are used for：According to determining input terminal OSNR, mould is calculated in conjunction with the equivalent OSNR costs
Equivalent OSNR costs obtained by block calculate output end OSNR.
Embodiment eight
OSNR computing devices provided in this embodiment for cascading image intensifer communication system, basic structure and implementation
Example seven is identical, the difference is that：Shown in Figure 4, which further includes fault detection module.The fault detection module is used
In：The signal light power for each every grade of channel that the signal light power computing module is calculated and actually measured light work(
Rate compares, if the two gap is more than specified threshold, judges to break down in link.
The present invention is based on the analysis of EDFA links, calculated by the noise characteristic of image intensifer and the operating condition of amplification
OSNR does not require other devices and structure of sending and receiving end.Compared with prior art, measurement range can reach 20dB or more,
Within precision is up to 1dB, system stability is good, and computation complexity is low, and is designed with certain meaning to following optical transmission system
Justice.
In order to further verify the attainable technique effect of institute of the invention, below in conjunction with attached drawing and simulation example, to foundation
The technique effect of OSNR numerical procedures proposed by the present invention for cascading image intensifer communication system is described in detail.
In the simulation example, by the way that transmitting 8 spans, each span length 100km, rate is the DWDM of 9*10Gbps
Optical fiber telecommunications system carries out OSNR and calculates come the detailed process for illustrating this method and final optical signal to noise ratio calculating effect.
Entire relevant optical transmission system is taken in VPI (the fibre system simulation software that VPIphotonics companies release)
It builds, the power after optical signal modulation is -18dBm, and every grade of light amplifier gain and optical fiber link loss are as shown in Figure 5：OA in figure
Indicate that image intensifer, noise coefficient are 6dB, the front two of lower section four figures indicates gain coefficient, from first to the tenth grade according to
Secondary is 18dB, 25dB, 25dB, 25dB, 14dB, 18dB, 25dB, 25dB, 25dB, 25dB；Numerical value is optical fiber link below link
Loss value, 25dB is taken in emulation, (Reconfigurable Optical Add-Drop Multiplexer, can by ROAD M
Reconstruct optical add/drop multiplexer) loss be 7dB.Gain slope representative value is -1dB/THz, but on two 1821 image intensifers
Preemphasis is 3dB, i.e. the 1529.16nm ratio 1560.20nm high 3dB of unicast power, and shortwave to long wave power successively decreases 3/79dB successively.
Specific processing method is as follows：
1, according to the content in step S1, every grade of net gain Δ is easy to get by formula (1)j, in this system, Δ1=
Δ6=-7dB, Δ2=Δ3=Δ4=Δ7=Δ8=Δ9=0, Δ5=7dB.
2, according to the content in step S2, using net gain calculate centre frequency channel image intensifers at different levels signal light
Power recycles the parameter of gain slope value and preemphasis, calculates each channel signal light power Pin_e at different levels(i, j).Emulation
In, since there is no link failure, Pin_e(i, j)With Pin(i, j)It is identical, as shown in Figure 6.Wherein, f indicates channel frequency, unit
For THz；Pin indicates entry into the power of EDFA, unit dBm.
3, according to the content in step S3, the OSNR costs of each EDFA, i.e., the noise characteristic of each EDFA are first calculated
Influence to the i-th channel OSNR, as shown in Figure 7.Wherein, k reflects the OSNR costs of each EDFA, OSNREDFAi=1/ki.By it
Accumulate to obtain link OSNR costs, i.e.,
4, according to the content in step S4, by OSNRinAnd OSNRlinkInverted addition respectively, obtains OSNRoutInverse,
To obtain the output end OSNR of target, as shown in Figure 8.Wherein, OSNR units are dB.In order to examine its accuracy, by this side
Method result of calculation and simulated measurement Comparative result, difference DELTA OSNR are as shown in Figure 8.Δ OSNR units are dB.
To 9 channels, the system of 10 grades of image intensifers is brought the above process into and is calculated one by one, obtains each channel of output end
OSNR.Simulation result shows calculated OSNR in this way and emulates the OSNR errors measured within 1dB.Cause
This, optical signal to noise ratio calculating error obtained by this method is smaller, can reach requirement in actual use.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of OSNR computational methods for cascading image intensifer communication system, which is characterized in that this method includes following step
Suddenly：
S1, the gain coefficient using image intensifers at different levels, each section of optical fiber attenuation, calculate having a net increase of for image intensifer-fiber segment at different levels
Benefit；
S2, the increasing of signal light power, image intensifer at different levels after channel number, channel spacing, centre frequency Channel Modulation is utilized
Beneficial slope, and the net gain of image intensifer-fiber segments at different levels obtained by S1 is combined, calculate the signal light work(of each every grade of channel
Rate；
S3, according to every grade of noise of optical amplifier coefficient, the signal light power of each every grade of channel in conjunction with obtained by S2, calculate link
Equivalent OSNR costs；
S4, according to determining input terminal OSNR, the equivalent OSNR costs in conjunction with obtained by S3 calculate output end OSNR.
2. the OSNR computational methods as described in claim 1 for cascading image intensifer communication system, which is characterized in that in step
Further include following operation after rapid S2：By the signal light power for each every grade of the channel being calculated and actually measured light work(
Rate compares, if the two gap is more than specified threshold, judges to break down in link.
3. the OSNR computational methods as described in claim 1 for cascading image intensifer communication system, it is characterised in that：Step
In S1, using the gain coefficient of image intensifers at different levels, each section of optical fiber attenuation, the net gain of image intensifer-fiber segments at different levels is calculated
When, it is calculated using following formula：
Δj=Gj*Lj
Wherein, ΔjIndicate the net gain of j-th stage image intensifer-fiber segment, j ∈ [1, N]；N indicates the total series of image intensifer, is big
In 1 positive integer；GjIndicate the gain coefficient of j-th stage image intensifer, LjIndicate jth section optical fiber attenuation.
4. the OSNR computational methods as claimed in claim 3 for cascading image intensifer communication system, which is characterized in that step
S2 specifically includes following operation：
1) centre frequency for determining image intensifer utilizes the signal light power after the centre frequency Channel ModulationAnd it ties
Close the net gain Δ of calculated image intensifer-fiber segments at different levels in S1j, centre frequency channel is calculated step by step in light amplification at different levels
The signal light power of deviceIts calculation formula is：
Wherein, i0Indicate that centre frequency channel number, j indicate j-th stage image intensifer；
2) determine channel number Ch, using calculated centre frequency channel image intensifers at different levels signal light powerThe gain slope of channel spacing and image intensifer at different levels calculates the signal light power of each every grade of channel
Pin_e(i, j), calculation formula is：
Wherein, i indicates the i-th channel, i ∈ [1, Ch]；GTjIndicate the gain slope of j-th stage image intensifer；B indicates channel spacing.
5. the OSNR computational methods as claimed in claim 4 for cascading image intensifer communication system, which is characterized in that step
S3 specifically includes following operation：
1) according to every grade of noise of optical amplifier coefficient, the signal light power Pin_e of each every grade of channel in conjunction with obtained by S2(i, j)Meter
Calculate k(i, j), the k(i, j)For the influence of the i-th channel of noise characteristic pair OSNR of j-th stage image intensifer, calculation formula is：
Wherein, FjIndicate j-th stage noise of optical amplifier coefficient；
2) k of image intensifers at different levels is accumulated(i, j)It is inverted afterwards, calculate the equivalent OSNR costs OSNR of entire linklink, meter
Calculating formula is：
Wherein, N1 indicates that N1 grades of image intensifers, N2 indicate N2 grades of amplifiers；When calculating is from the 1st grade to the accumulation light of j-th stage
The k of amplifier(i, j), then N1=1, N2=j, and so on.
6. the OSNR computational methods as claimed in claim 5 for cascading image intensifer communication system, it is characterised in that：Step
In S4, according to determining input terminal OSNR, the equivalent OSNR costs in conjunction with obtained by S3, when calculating output end OSNR, use is following
Formula calculates：
Wherein, OSNRinFor input terminal OSNR, OSNRlinkFor the equivalent OSNR costs obtained by S3, OSNRoutFor output end OSNR.
7. special such as the OSNR computational methods according to any one of claims 1 to 6 for cascading image intensifer communication system
Sign is：The image intensifer is EDFA Erbium-Doped Fiber Amplifier EDFA.
8. special such as the OSNR computational methods according to any one of claims 1 to 6 for cascading image intensifer communication system
Sign is：The cascade image intensifer communication system includes laser light source, optical modulator and N number of cascade image intensifer；
The optical modulator is connected to the output end of laser light source, the optical signal sent out for modulating laser light source；N number of grade
It is connected between the image intensifer of connection by being used for transmission the optical fiber of optical signal, and first order image intensifer is connected to optical modulator
Output end, the modulated optical signal for exporting optical modulator export after being amplified, and N grades of image intensifers are connected to optical fiber
Output end, for will be exported after the optical signal amplification after transmission.
9. a kind of OSNR computing devices for cascading image intensifer communication system for realizing claim 1 the method, special
Sign is：The device includes net gain computing module, signal light power computing module, equivalent OSNR costs computing module and target
OSNR computing modules；
The net gain computing module is used for：Using the gain coefficient of image intensifers at different levels, each section of optical fiber attenuation, light at different levels are calculated
The net gain of amplifier-fiber segment；
The signal light power computing module is used for：Utilize the signal after channel number, channel spacing, centre frequency Channel Modulation
The gain slope of luminous power, image intensifer at different levels, and image intensifer-optical fiber at different levels in conjunction with obtained by the net gain computing module
The net gain of section, calculates the signal light power of each every grade of channel；
The equivalent OSNR costs computing module is used for：According to every grade of noise of optical amplifier coefficient, in conjunction with the signal light power
The signal light power of each every grade of channel obtained by computing module calculates the equivalent OSNR costs of link；
The target OSNR computing modules are used for：According to determining input terminal OSNR, mould is calculated in conjunction with the equivalent OSNR costs
Equivalent OSNR costs obtained by block calculate output end OSNR.
10. the OSNR computing devices as claimed in claim 9 for cascading image intensifer communication system, it is characterised in that：It should
Device further includes fault detection module, which is used for：The signal light power computing module is calculated
The signal light power of each every grade of channel is compared with actually measured luminous power, if the two gap is more than specified threshold, is judged
It breaks down in link.
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| CN201810195415.7A CN108512596B (en) | 2018-03-09 | 2018-03-09 | For cascading the OSNR calculation method and device of image intensifer communication system |
| PCT/CN2018/119049 WO2019169915A1 (en) | 2018-03-09 | 2018-12-04 | Osnr calculation method and apparatus for cascaded optical amplifier communication system |
| BR112020005219-1A BR112020005219A2 (en) | 2018-03-09 | 2018-12-04 | device and method of calculating the optical signal-to-noise ratio for a cascading optical amplifier communication system. |
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| WO2019169915A1 (en) * | 2018-03-09 | 2019-09-12 | 烽火通信科技股份有限公司 | Osnr calculation method and apparatus for cascaded optical amplifier communication system |
| CN113114351A (en) * | 2021-03-18 | 2021-07-13 | 中国联合网络通信集团有限公司 | Performance determination method and device of optical transmission system |
| CN113708835A (en) * | 2021-08-27 | 2021-11-26 | 烽火通信科技股份有限公司 | OSNR detection method and device |
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| CN1784849A (en) * | 2003-05-08 | 2006-06-07 | 西门子公司 | Method for pre-emphasis of an optical multiplex signal |
| CN101145838A (en) * | 2006-09-13 | 2008-03-19 | 中兴通讯股份有限公司 | A method for obtaining DWDM system optical S/N ratio |
| US20140334814A1 (en) * | 2013-05-10 | 2014-11-13 | Nec Laboratories America, Inc. | Adaptive Optical Amplifier for WDM Systems |
| CN106788708A (en) * | 2016-12-22 | 2017-05-31 | 云南电网有限责任公司 | The OSNR computational methods of OTN networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1784849A (en) * | 2003-05-08 | 2006-06-07 | 西门子公司 | Method for pre-emphasis of an optical multiplex signal |
| CN101145838A (en) * | 2006-09-13 | 2008-03-19 | 中兴通讯股份有限公司 | A method for obtaining DWDM system optical S/N ratio |
| US20140334814A1 (en) * | 2013-05-10 | 2014-11-13 | Nec Laboratories America, Inc. | Adaptive Optical Amplifier for WDM Systems |
| CN106788708A (en) * | 2016-12-22 | 2017-05-31 | 云南电网有限责任公司 | The OSNR computational methods of OTN networks |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019169915A1 (en) * | 2018-03-09 | 2019-09-12 | 烽火通信科技股份有限公司 | Osnr calculation method and apparatus for cascaded optical amplifier communication system |
| CN113114351A (en) * | 2021-03-18 | 2021-07-13 | 中国联合网络通信集团有限公司 | Performance determination method and device of optical transmission system |
| CN113708835A (en) * | 2021-08-27 | 2021-11-26 | 烽火通信科技股份有限公司 | OSNR detection method and device |
| CN113708835B (en) * | 2021-08-27 | 2022-10-21 | 烽火通信科技股份有限公司 | OSNR detection method and device |
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