CN103166708A - Method for increasing output optical signal-to-noise ratio of remote pump system - Google Patents
Method for increasing output optical signal-to-noise ratio of remote pump system Download PDFInfo
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Abstract
The invention is applicable to the field of optical communication, and provides a method for increasing the output optical signal-to-noise ratio of a remote pump system. The method includes the steps: respectively measuring gains and noise indexes of a power amplifier, a remote gain unit, a remote pump unit and an optical preamplifier under the condition of changing the wavelength of an input optical signal and/or the length of a second transmission fiber; and acquiring the output optical signal-to-noise ratio of the remote pump system according to the measured gains and the measured noise indexes, and acquiring the wavelength of the input optical signal and/or the length of the second transmission fiber in the current state when the optical signal-to-noise ratio is the highest. The optimal input optical wavelength and the optimal distance between an RGU (remote graphics unit) and an RPU (remote processing unit) are obtained by design calculation, the remote pump system is in the optimal operating state, the highest optical signal-to-noise ratio is outputted, the bit error rate is effectively reduced, and reliability and stability of the system are improved.
Description
Technical field
The invention belongs to optical communication field, relate in particular to a kind of method that improves Remote optical pumping amplifier output Optical Signal To Noise Ratio.
Background technology
Overlength single spanning distance optical transmission system is different from traditional communication system, and the cable length General Requirements hundreds of kilometer of its single spanning distance can not have any trunking in the middle of circuit.The full optical transmission system of overlength span provides powerful guarantee for network security, stable, economical operation.Owing to having reduced light/electric conversion times, and can utilize the abundant bandwidth resources of optical fiber, the extra long distance transmission technology greatly reduces the cost of long Distance Transmission, and reliability and the transmission quality of simultaneity factor all are guaranteed.In the time of still can not solving the long span problem after adopting the routine techniquess such as forward error correction technique, modulation format, increase transmitted power, power amplifier, preamplifier, Raman amplification, select distant pump technology can further enlarge the single spanning distance distance.Distant pump technology is to insert the gain media such as erbium-doped fiber so that light amplification to be provided in optical cable, do not need power supply facilities at this point simultaneously, do not need personnel to safeguard yet, be suitable for passing through the maintenances such as desert, plateau, lake, straits, inconvenient area powers, because there is no relay station, reduced the regular maintenance cost.
Current distant pump (ROPA, Remote Optically Pumped Amplifier) technology is widely used in the non-relay optical transmission system of long span, the laser that reaches several watts as power output in the 1450nm of pump light wavelength～1490nm wave-length coverage is commercial, and this also makes the ROPA system more attractive.On the other hand, when the span of circuit all exhausts the index of Raman (RA) amplification, adopt ROPA can make to improve again the 10dB left and right across damaging, can allow on span to have expansion greatly.In system, ROPA and RA are combined to use, can extend transmission distance to greatest extent, improve the system power budget.
At present, in the actual engineering design of Remote optical pumping amplifier, long-range gain unit (RGU, Remote Gain Unit) and remotely pumping unit (RPU, Remote Pump Unit) be to design separately, the design principle of RGU is that the circuit optical signal gain is as far as possible large, noise figure is as far as possible little, in Remote optical pumping amplifier, the distance between input optical signal wavelength and RGU and RPU is all to choose based on experience value at present, not through concrete calculating design, make the output Optical Signal To Noise Ratio of existing Remote optical pumping amplifier not reach maximum, the reliability and stability of system can not reach optimum efficiency.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of method that improves Remote optical pumping amplifier output Optical Signal To Noise Ratio, be intended to solve existing Remote optical pumping amplifier due to the distance between designing and calculating input optical signal wavelength and RGU and RPU not, make system can't export maximum Optical Signal To Noise Ratio.
In this programme, described Remote optical pumping amplifier comprises optical sender, power amplifier, the first Transmission Fibers, long-range gain unit, the second Transmission Fibers, remotely pumping unit, Optical Preamplifier and the optical receiver connected in turn, wherein, described long-range gain unit comprises the Er-doped fiber of two sections connections, and the method for described raising Remote optical pumping amplifier output Optical Signal To Noise Ratio comprises the steps:
Under the condition that changes input optical signal wavelength and/or the second Transmission Fibers length, record respectively gain and the noise figure of power amplifier, long-range gain unit, remotely pumping unit and this four device of Optical Preamplifier;
Obtain the output Optical Signal To Noise Ratio of Remote optical pumping amplifier according to the gain recorded and noise figure, when described Optical Signal To Noise Ratio is maximum, obtain input optical signal wavelength and/or the second Transmission Fibers length under current state.
The invention has the beneficial effects as follows: the distance in Remote optical pumping amplifier between input optical signal wavelength and RGU and RPU all can have influence on the output Optical Signal To Noise Ratio of Remote optical pumping amplifier, in technical solution of the present invention, by change the input optical signal wavelength and/or change the distance (i.e. the length of the second Transmission Fibers) between RGU and RPU simultaneously, can be so that the overall system noise figure has a minimum value, concrete, under the condition that changes input optical signal wavelength and/or the second Transmission Fibers length, accurately calculate the output Optical Signal To Noise Ratio of Remote optical pumping amplifier, when described Optical Signal To Noise Ratio is maximum, obtain input optical signal wavelength and/or the second Transmission Fibers length under state now, this input optical signal wavelength is exactly best input optical signal wavelength, this the second Transmission Fibers length is exactly the optimum distance between RGU and RPU, therefore when the design Remote optical pumping amplifier, by choosing the optimum distance between best input optical signal wavelength and/or RGU and RPU, can be so that Remote optical pumping amplifier be exported maximum Optical Signal To Noise Ratio, thereby effectively reduce the error rate, the reliability and stability of elevator system, extend the relay transmission distance, improve the system power budget.
The accompanying drawing explanation
Fig. 1 is the structure chart of Remote optical pumping amplifier;
Fig. 2 is the flow chart of the method for the raising Remote optical pumping amplifier output Optical Signal To Noise Ratio that provides of first embodiment of the invention;
Fig. 3 is RGU gain and noise figure test First Principle figure;
Fig. 4 is that RGU gain and noise figure are tested the second schematic diagram;
Fig. 5 is input optical signal wavelength and RGU gain curve figure;
Fig. 6 is input optical signal wavelength and RGU noise figure curve chart;
Fig. 7 is oppositely pumping light power and the RGU gain curve figure of input of RGU;
Fig. 8 is oppositely pumping light power and the RGU noise figure curve chart of input of RGU;
Fig. 9 is Remote optical pumping amplifier input signal light wavelength and the curve chart of exporting Optical Signal To Noise Ratio;
Figure 10 is RGU and GPU different spacing and the curve chart of exporting Optical Signal To Noise Ratio;
Figure 11 is the flow process of the method for the raising Remote optical pumping amplifier output Optical Signal To Noise Ratio that provides of second embodiment of the invention;
Figure 12 is the light channel structure figure of configuration RGU.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
For technical solutions according to the invention are described, below by specific embodiment, describe.
Fig. 1 shows the structure of Remote optical pumping amplifier, comprise the optical sender 1, power amplifier 2, the first Transmission Fibers 3, long-range gain unit 4, the second Transmission Fibers 5, remotely pumping unit 6, Optical Preamplifier 7 and the optical receiver 8 that connect in turn, comprise the Er-doped fiber of two sections connections in its medium-long range gain unit 4.After described optical sender 1 sends light signal, 2 pairs of described light signals of power amplifier carry out power amplification, be added to fiber optical power, input optical signal is through the first Transmission Fibers 3 transmission, because the first Transmission Fibers 3 distances are longer, signal attenuation is arranged in transmitting procedure, therefore the input optical signal after 4 pairs of decay of long-range gain unit further amplifies, after amplification, through the second Transmission Fibers 5, transmit again, figure medium-long range pump unit 6 provides the pump light of the reverse transfer that a power is larger, described remotely pumping unit 6 has the input signal photo detecting unit, pump light and reflected optical power probe unit are to guarantee security of system, the output of remotely pumping unit 6 is connected with Optical Preamplifier 7, Optical Preamplifier 7 is for improving the flashlight receiving sensitivity.The output of Optical Preamplifier 7 is connected with the input port of receiver 8.The unit of remotely pumping described in this example 6 provides the far-end pump light of a relatively high power, power is not less than 30dBm, pump light wavelength range of choice is 1460nm～1490nm, realize when Raman amplifies for long-range gain unit 4 provides pump light, making further raising unrepeatered transmission distance.
In Remote optical pumping amplifier, distance between input optical signal wavelength and long-range gain unit 4 and remotely pumping unit 6 (i.e. the second fiber lengths) affects system output Optical Signal To Noise Ratio, for these two important parameters, existing Remote optical pumping amplifier is chosen empirical value usually, through accurate, do not calculate and design, make like this whole structure of system not reach optimum, can't further reduce the error rate.The embodiment of the present invention provides a kind of method that improves Remote optical pumping amplifier output Optical Signal To Noise Ratio, obtain best input optical signal wavelength and/or optimal spacing (distance between long-range gain unit 4 and remotely pumping unit 6), make Remote optical pumping amplifier in optimum Working, the raising system is energy.
embodiment mono-:
The raising Remote optical pumping amplifier that Fig. 2 shows first embodiment of the invention to be provided is exported the flow process of the method for Optical Signal To Noise Ratio, only shows for convenience of explanation the part relevant to the embodiment of the present invention.
The method of the raising Remote optical pumping amplifier output Optical Signal To Noise Ratio that the present embodiment provides comprises the steps:
Step S201, under the condition that changes input optical signal wavelength and/or the second Transmission Fibers length, record respectively gain and the noise figure of power amplifier, long-range gain unit, remotely pumping unit and this four device of Optical Preamplifier.
What this step mainly realized is in the situation that constantly adjust input optical signal wavelength and/or the second Transmission Fibers length, measure gain and the noise figure of power amplifier under each state, long-range gain unit, remotely pumping unit and this four device of Optical Preamplifier, suppose that the gain of power amplifier, long-range gain unit, remotely pumping unit and Optical Preamplifier is respectively G
b, G, G
r, G
p, the noise figure that power amplifier, long-range gain unit, remotely pumping unit, preamplifier produce is respectively NF
bA, NF
rGU, NF
rA, NF
pA, gain and the noise figure of described each device obtain by spectroanalysis instrument, concrete, spectroanalysis instrument is linked into respectively to input and the output of device, obtain respectively the input before and the input after light signal strength and noise intensity, so just can analyze gain and the noise figure of this device, such as for long-range gain unit, as shown in Figure 3, at first disconnect the first Transmission Fibers 3 and long-range gain unit 4, and connect spectroanalysis instrument at the output of the first Transmission Fibers 3, obtain input front light signal strength and noise intensity, then as shown in Figure 4, after connecting the first Transmission Fibers 3 and long-range gain unit 4, access wavelength division multiplexer between long-range gain unit 4 and the second Transmission Fibers 5, the backward pumping light of remotely pumping unit output enters long-range gain unit 4, the transmission end of wavelength division multiplexer connects the polishing wax analyzer, so just can obtain light signal strength and noise intensity after long-range gain unit 4 amplifies, before amplifying by comparison and light signal strength and noise intensity after amplifying, just can record gain and the noise figure of long-range gain unit 4, Fig. 5 and Fig. 6 show respectively in the second Transmission Fibers length when constant, constantly change the wavelength of input optical signal, measured RGU gain and noise figure curve chart, Fig. 7 and Fig. 8 show when input optical wavelength immobilizes, constantly change the second Transmission Fibers apart from the time, measured RGU gain and noise figure curve chart, for convenient mapping, the long-range gain unit of take in Fig. 7 and Fig. 8 oppositely pumping light power of input is transverse axis, RGU gain and noise figure are longitudinal axis drawing, it is to be noted, the remotely pumping unit provides backward pumping light for long-range gain unit, after the length that changes the second Transmission Fibers, the pumping light power that oppositely is input to long-range gain unit also can constantly change, the gain of other devices is identical with the noise-figure measurement method.
When changing input optical signal wavelength and/or the second Transmission Fibers length, concrete, can at first the second Transmission Fibers length be fixed, in certain wave-length coverage, (such as 1530nm～1570nm) progressively adjusts the input optical signal wavelength, measure gain and the noise figure of each device, then the input optical signal wavelength being fixed on to a wavelength value, progressively adjust within the specific limits the second Transmission Fibers length, then measure gain and the noise figure of each device.
The output Optical Signal To Noise Ratio that the gain that step S202, basis record and noise figure are obtained Remote optical pumping amplifier, when described Optical Signal To Noise Ratio is maximum, obtain input optical signal wavelength and/or the second Transmission Fibers length under current state.
According to ITU-T Rec, G.692 with the system equivalent noise figure, definition can show that system output output optical noise is than OSNR expression formula, OSNR
out(dB)=P
in(dBm)+58-10lg (F
sys-1/G
always) P wherein
infor the power output of optical sender, the overall gain G of Remote optical pumping amplifier
always=G
bgG
rg
p/ (T
1t
2), the global noise index F of Remote optical pumping amplifier
sys=P
aSE is total/ (h ν B
0g
always)+1/G
always, the accumulation ASE noise P that the Remote optical pumping amplifier output produces
aSE is totalmean that ASE noise that each amplifier produces amplifies through follow-up amplifier and optical fiber attenuation after value cumulative, its expression formula is:
P
aSE is total=P
aSE-BAgG
rg
p/ (T
1t
2)+P
aSE-RGUg
rg
p/ T
2+ P
aSE-RAg
p+ P
aSE-PA
Wherein, P
aSE-BA, P
aSE-RGU, P
aSE-RA, P
aSE-PArespectively the ASE noise power of power amplifier, long-range gain unit, remotely pumping unit, preamplifier generation, G
b, G, G
r, G
pbe respectively the gain of power amplifier, long-range gain unit, remotely pumping unit, preamplifier, the ASE noise power can be obtained through numerical transformation by noise figure and gain, T
1and T
2be respectively the loss of two sections Er-doped fibers in long-range gain unit, concrete loss graph of a relation as shown in Figure 7, after the length and input optical wavelength of determining Transmission Fibers, just can be learnt T
1and T
2.
Therefore acquiring one group of NF at every turn
bA, NF
rGU, NF
-RA, NF
pA, G
b, G, G
r, G
pafter, just can obtain an optical noise than the OSNR value, (usually first remove the experience length value when the second Transmission Fibers length is constant, such as 100km), while progressively adjusting the input optical signal wavelength, when Optical Signal To Noise Ratio is maximum, input optical signal wavelength now is best input optical signal wavelength, concrete reference Remote optical pumping amplifier input signal light wavelength as shown in Figure 9 and the curve chart of exporting Optical Signal To Noise Ratio, best input optical wavelength is the 1560nm left and right as can be seen from Figure, then fix best input optical signal wavelength, adjust again the second Transmission Fibers length, when Optical Signal To Noise Ratio is maximum, the length of the second Transmission Fibers now is optimal spacing, concrete reference RGU and GPU different spacing and the curve chart of exporting Optical Signal To Noise Ratio as shown in figure 10, optimal spacing is the 105km left and right as can be seen from Figure.Equally, also can be first fixedly input optical signal wavelength (usually choosing the experience wavelength value, such as 1550nm) by calculating optimal spacing, then adjust the input optical signal wavelength and obtain best input optical wavelength.Perhaps also can have to best input optical wavelength or optimal spacing.
To sum up, it should be noted that, the present embodiment comprises three kinds of concrete methods of adjustment, comprising:
1, fix the second Transmission Fibers length constant, progressively adjust the input optical signal wavelength, when described output Optical Signal To Noise Ratio maximum, input optical signal wavelength now is best input optical wavelength.
2, fixedly the input optical signal wavelength is a wavelength value, progressively adjusts the distance between long-range gain unit and remotely pumping unit, and when described output Optical Signal To Noise Ratio maximum, the length of the second Transmission Fibers now is optimal spacing.
3, after obtaining best input optical signal wavelength, more progressively adjust the distance between long-range gain unit and remotely pumping unit, further obtain optimal spacing; Perhaps after obtaining optimal spacing, more progressively adjust the input optical signal wavelength, further obtain best input optical wavelength, so just can obtain best input optical wavelength and optimal spacing simultaneously, make Remote optical pumping amplifier in optimum Working, reduce error rate of system.
embodiment bis-:
The raising Remote optical pumping amplifier that Figure 11 shows second embodiment of the invention to be provided is exported the flow process of the method for Optical Signal To Noise Ratio, only shows for convenience of explanation the part relevant to the embodiment of the present invention.
The method of the raising Remote optical pumping amplifier output Optical Signal To Noise Ratio that the present embodiment provides comprises the steps:
Step S111, in the situation that different input optical signal wavelength, signal power and different pump light wavelength and pumping light powers, obtain optimum length ratio and the optimum length summation of two sections Er-doped fibers in long-range gain unit, make long-range gain unit minimum on the global noise index impact of Remote optical pumping amplifier;
Step S112, under the condition that changes input optical signal wavelength and/or the second Transmission Fibers length, record respectively gain and the noise figure of power amplifier, long-range gain unit, remotely pumping unit and this four device of Optical Preamplifier;
The output Optical Signal To Noise Ratio that the gain that step S113, basis record and noise figure are obtained Remote optical pumping amplifier, when described Optical Signal To Noise Ratio is maximum, obtain input optical signal wavelength and/or the second Transmission Fibers length under current state.
The present embodiment has increased step S111 on the basis of embodiment mono-, and this step is mainly the light channel structure of the long-range gain unit of configuration, makes long-range gain unit have the optimal light line structure, further reduces the noise effect of long-range gain unit to Remote optical pumping amplifier.
The light channel structure of the long-range gain unit of configuration as shown in figure 12, the Er-doped fiber 42 that comprises two sections connections, 43, the lenth ratio of described two sections Er-doped fibers and length summation can have influence on the performance of long-range gain unit, described step S111 obtains optimum length ratio and the optimum length summation of Er-doped fiber by a large amount of experiments repeatedly, during specific implementation, can be at different input optical signal wavelength, in the situation of signal power and different pump light wavelength and pumping light power, obtain gain and the noise figure of the long-range gain unit of configuration by spectroanalysis instrument, obtain optimum length ratio and the optimum length summation of Er-doped fiber under different condition, then when designing different Remote optical pumping amplifier, select optimum optimum length ratio and optimum length summation, obtain the long-range gain unit of optimal light line structure.
In the present embodiment, described Er-doped fiber is preferably the low concentration Er-doped fiber with less mode field diameter and bigger numerical aperture, and its concentration is 2.5-4.5dB/m, and the absorption peak corresponding wavelength is 1530nm.Except Er-doped fiber, the long-range gain unit that this enforcement provides also comprises the light isolation wavelength division multiplexing synthesizer 41,45 that is located at described Er-doped fiber two ends, the junction loss and the insertion loss that to reduce a plurality of devices, bring, described light isolation wavelength division multiplexing synthesizer comprises optical isolator and 1480/1550 wavelength division multiplexer integrated device, preferably, described long-range gain unit also comprises the pump light speculum 44 be located between described Er-doped fiber 43 and light isolation wavelength division multiplexing synthesizer 45, takes full advantage of the pump light of long-range gain unit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. one kind is improved the method that Remote optical pumping amplifier is exported Optical Signal To Noise Ratio, described Remote optical pumping amplifier comprises optical sender (1), power amplifier (2), the first Transmission Fibers (3), long-range gain unit (4), the second Transmission Fibers (5), remotely pumping unit (6), Optical Preamplifier (7) and the optical receiver (8) connected in turn, wherein, described long-range gain unit (4) comprises the Er-doped fiber (42,43) of two sections connections, it is characterized in that, described method comprises:
Under the condition that changes input optical signal wavelength and/or the second Transmission Fibers length, record respectively gain and the noise figure of power amplifier, long-range gain unit, remotely pumping unit and this four device of Optical Preamplifier;
Obtain the output Optical Signal To Noise Ratio of Remote optical pumping amplifier according to the gain recorded and noise figure, when described Optical Signal To Noise Ratio is maximum, obtain input optical signal wavelength and/or the second Transmission Fibers length under current state.
2. method as claimed in claim 1, it is characterized in that, under the described condition changing input optical signal wavelength and/or the second Transmission Fibers length, the gain and the noise figure step that record respectively power amplifier, long-range gain unit, remotely pumping unit and this four device of Optical Preamplifier also comprise before:
In the situation that different input optical signal wavelength, signal power and different pump light wavelength and pumping light powers, obtain optimum length ratio and the optimum length summation of two sections Er-doped fibers in long-range gain unit, make long-range gain unit minimum on the global noise index impact of Remote optical pumping amplifier.
3. method as claimed in claim 1 or 2, it is characterized in that, the gain that described basis records and noise figure are obtained the output Optical Signal To Noise Ratio of Remote optical pumping amplifier, and when described Optical Signal To Noise Ratio is maximum, input optical signal wavelength and/or the second Transmission Fibers length step obtained under current state specifically comprise:
In the situation that different input optical signal wavelength and/or the second Transmission Fibers length, obtain the output Optical Signal To Noise Ratio OSNR of Remote optical pumping amplifier
out(dB)=P
in(dBm)+58-10lg (F
sys-1/G
always), wherein said P
infor the power output of optical sender, the overall gain G of Remote optical pumping amplifier
always=G
bgG
rg
p/ (T
1t
2), the global noise index F of Remote optical pumping amplifier
sys=P
aSE is total/ (h ν B
0g
always)+1/G
always, the integration noise P of Remote optical pumping amplifier
aSE is total=P
aSE-BAgG
rg
p/ (T
1t
2)+P
aSE-RGUg
rg
p/ T
2+ P
aSE-RAg
p+ P
aSE-PA, wherein, P
aSE-BA, P
aSE-RGU, P
aSE-RA, P
aSE-PArespectively the ASE noise power of power amplifier, long-range gain unit, remotely pumping unit, preamplifier generation, G
b, G, G
r, G
prespectively the gain of power amplifier, long-range gain unit, remotely pumping unit, preamplifier, T
1and T
2be respectively the loss of two sections Er-doped fibers in long-range gain unit;
Obtain wavelength of optical signal and/or the second Transmission Fibers length of described Optical Signal To Noise Ratio when maximum.
4. method as claimed in claim 3, is characterized in that, described input optical signal wavelength range of choice is 1530nm～1570nm.
5. method as claimed in claim 5, is characterized in that, the pump light wavelength range of choice of described remotely pumping unit is 1460nm～1490nm.
6. method as claimed in claim 5, is characterized in that, the pumping light power of described remotely pumping unit is not less than 30dBm.
7. method as claimed in claim 6, is characterized in that, the Er-doped fiber concentration in described long-range gain unit is 2.5-4.5dB/m.
8. method as claimed in claim 7, is characterized in that, described long-range gain unit (4) comprises the light isolation wavelength division multiplexing synthesizer (41,45) that is located at described Er-doped fiber (42) two ends.
9. method as claimed in claim 8, is characterized in that, described long-range gain unit (4) also comprises the pump light speculum (44) be located between described Er-doped fiber (43) and light isolation wavelength division multiplexing synthesizer (45).
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| CN106330316A (en) * | 2015-06-24 | 2017-01-11 | 国家电网公司 | Multi-wavelength OTN ultra-long-haul span transmission method and system |
| CN109075864A (en) * | 2016-04-15 | 2018-12-21 | 骁阳网络有限公司 | Via the ROPA in the same direction for the separation optical fiber supply power for transmitting data in opposite direction |
| CN107192439A (en) * | 2017-05-05 | 2017-09-22 | 天津大学 | A kind of remote phase sensitive optical time domain reflectometer amplified based on passive relay |
| CN108365889A (en) * | 2018-02-28 | 2018-08-03 | 武汉光迅科技股份有限公司 | A method of improving wavelength-division multiplex system optical signal to noise ratio OSNR accuracy |
| CN108365889B (en) * | 2018-02-28 | 2020-02-14 | 武汉光迅科技股份有限公司 | Method for improving OSNR accuracy of wavelength division multiplexing system |
| CN109120370A (en) * | 2018-07-27 | 2019-01-01 | 武汉光迅科技股份有限公司 | A kind of DWDM remotely pumping system that OSNR can be improved |
| US11265098B2 (en) | 2018-07-27 | 2022-03-01 | Accelink Technologies Co., Ltd. | DWDM remote pumping system capable of improving OSNR |
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