CN103166708B - A kind of method improving Remote optical pumping amplifier output Optical Signal To Noise Ratio - Google Patents
A kind of method improving Remote optical pumping amplifier output Optical Signal To Noise Ratio Download PDFInfo
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Abstract
The present invention is applicable to optical communication field, there is provided a kind of and improve the method that Remote optical pumping amplifier exports Optical Signal To Noise Ratio, under being included in the condition changing input optical signal wavelength and/or the second Transmission Fibers length, record gain and the noise figure of power amplifier, remote gain unit, remotely pumping unit and this four device of Optical Preamplifier respectively; 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 the input optical signal wavelength under current state and/or the second Transmission Fibers length.The present invention obtains the optimal spacing of best input optical wavelength and RGU and RPU by designing and calculating, makes Remote optical pumping amplifier be in optimum Working, exports maximum Optical Signal To Noise Ratio, effectively reduces the error rate, the reliability and stability of elevator system.
Description
Technical field
The invention belongs to optical communication field, particularly relate to a kind of method improving 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, the cable length General Requirements hundreds of kilometer of its single spanning distance, can not have any trunking in the middle of circuit.Overlength span all-optical transmission system is network security, stable, economical operation provides powerful guarantee.Owing to decreasing light/electric conversion times, and the bandwidth resources that optical fiber can be utilized abundant, ultra-long span transmission technology greatly reduces the cost of long range propagation, and reliability and the transmission quality of simultaneity factor are obtained for guarantee.When still can not solve long span problem after adopting the routine techniquess such as forward error correction technique, modulation format, increase transmitted power, power amplifier, preamplifier, Raman amplifiction, select distant pump technology can expand single spanning distance distance further.Distant pump technology in optical cable, inserts the gain medias such as erbium-doped fiber to provide light amplification, do not need power supply facilities at this point simultaneously, personnel are not needed to safeguard yet, be suitable for passing through the area that desert, plateau, lake, straits etc. are safeguarded, power supply is inconvenient, because there is no relay station, decrease regular maintenance cost.
Current distant pump (ROPA, Remote Optically Pumped Amplifier) technology widely uses in the non-relay optical transmission system of long span, the laser reaching several watts as power output in 1450nm ~ 1490nm wave-length coverage of pump wavelength is commercial, and this also makes ROPA system more attractive.On the other hand, when the index that Raman (RA) amplifies all exhausts by the span of circuit time, adopt ROPA can make to improve about 10dB again across damage, can allow span has to expand greatly.In systems in which ROPA and RA is combined use, can extend transmission distance to greatest extent, improve system power budget.
At present, in the actual engineering design of Remote optical pumping amplifier, remote gain unit (RGU, Remote Gain Unit) and remotely pumping unit (RPU, Remote Pump Unit) be design separately, the design principle of RGU is that circuit optical signal gain is as far as possible large, noise figure is as far as possible little, distance in current Remote optical pumping amplifier between input optical signal wavelength and RGU and RPU is all choose based on experience value, do not design through concrete calculating, the output Optical Signal To Noise Ratio of existing Remote optical pumping amplifier is made 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 improving Remote optical pumping amplifier output Optical Signal To Noise Ratio, be intended to solve existing Remote optical pumping amplifier due to the distance between not designing and calculating input optical signal wavelength and RGU and RPU, make system cannot export maximum Optical Signal To Noise Ratio.
In this programme, described Remote optical pumping amplifier comprises the optical sender, power amplifier, the first Transmission Fibers, remote gain unit, the second Transmission Fibers, remotely pumping unit, Optical Preamplifier and the optical receiver that connect in turn, wherein, described remote gain unit comprises two sections of Er-doped fibers connected, and the method that described raising Remote optical pumping amplifier exports Optical Signal To Noise Ratio comprises the steps:
Under the condition changing input optical signal wavelength and/or the second Transmission Fibers length, record gain and the noise figure of power amplifier, remote gain unit, remotely pumping unit and this four device of Optical Preamplifier respectively;
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 the input optical signal wavelength under current state and/or the second Transmission Fibers length.
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 the distance (i.e. the length of the second Transmission Fibers) changing input optical signal wavelength and/or change between RGU and RPU simultaneously, overall system noise figure can be made to have a minimum value, concrete, under the condition changing 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 the input optical signal wavelength under now state and/or the second Transmission Fibers length, 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 designing Remote optical pumping amplifier, by choosing the optimum distance between best input optical signal wavelength and/or RGU and RPU, Remote optical pumping amplifier can be made to export maximum Optical Signal To Noise Ratio, thus effectively reduce the error rate, the reliability and stability of elevator system, extend relay transmission distance, improve system power budget.
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 first embodiment of the invention provides;
Fig. 3 is RGU gain and noise figure test First Principle figure;
Fig. 4 is that RGU gain and noise figure test 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 the pumping light power that oppositely inputs of RGU and RGU gain curve figure;
Fig. 8 is the pumping light power that oppositely inputs of RGU and RGU noise figure curve chart;
Fig. 9 is Remote optical pumping amplifier input signal light wavelength and the curve chart exporting Optical Signal To Noise Ratio;
Figure 10 is RGU and GPU different spacing and the curve chart 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 second embodiment of the invention provides;
Figure 12 is the light channel structure figure of configuration RGU.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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, be not intended to limit the present invention.
In order to technical solutions according to the invention are described, be described below by specific embodiment.
Fig. 1 shows the structure of Remote optical pumping amplifier, comprise the optical sender 1, power amplifier 2, first Transmission Fibers 3, remote gain unit 4, second Transmission Fibers 5, remotely pumping unit 6, Optical Preamplifier 7 and the optical receiver 8 that connect in turn, wherein in remote gain unit 4, comprise two sections of Er-doped fibers connected.After described optical sender 1 sends light signal, power amplifier 2 carries out power amplification to described light signal, be added to fiber optical power, input optical signal transmits through the first Transmission Fibers 3, because the first Transmission Fibers 3 is apart from longer, signal attenuation is had in transmitting procedure, therefore remote gain unit 4 amplifies further to the input optical signal after decay, transmit through the second Transmission Fibers 5 again after amplification, 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 input signal photo detecting unit, pump light and reflected optical power probe unit are to ensure security of system, the output of remotely pumping unit 6 is connected with Optical Preamplifier 7, Optical Preamplifier 7 is for improving 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 wavelength range of choice is 1460nm ~ 1490nm, pump light can also be provided for remote gain unit 4 while realizing Raman amplifiction, make to improve unrepeatered transmission distance further.
In Remote optical pumping amplifier, input optical signal wavelength and the distance between remote gain unit 4 and remotely pumping unit 6 (i.e. the second fiber lengths) affect system and export Optical Signal To Noise Ratio, for these two important parameters, existing Remote optical pumping amplifier chooses empirical value usually, do not calculate and design through accurate, make the whole structure of system not reach optimum like this, the error rate cannot be reduced further.Embodiments provide a kind of method improving Remote optical pumping amplifier output Optical Signal To Noise Ratio, obtain best input optical signal wavelength and/or optimal spacing (distance between remote gain unit 4 and remotely pumping unit 6), make Remote optical pumping amplifier be in optimum Working, improve system system energy.
embodiment one:
The raising Remote optical pumping amplifier that Fig. 2 shows first embodiment of the invention to be provided exports the flow process of the method for Optical Signal To Noise Ratio, illustrate only the part relevant to the embodiment of the present invention for convenience of explanation.
The method that the raising Remote optical pumping amplifier that the present embodiment provides exports Optical Signal To Noise Ratio comprises the steps:
Step S201, under the condition changing input optical signal wavelength and/or the second Transmission Fibers length, record gain and the noise figure of power amplifier, remote gain unit, remotely pumping unit and this four device of Optical Preamplifier respectively.
What this step mainly realized is when constantly adjusting input optical signal wavelength and/or the second Transmission Fibers length, measure gain and the noise figure of power amplifier, remote gain unit, remotely pumping unit and this four device of Optical Preamplifier under each state, suppose that the gain of power amplifier, remote gain unit, remotely pumping unit and Optical Preamplifier is respectively G
b, G, G
r, G
p, the noise figure that power amplifier, remote gain unit, remotely pumping unit, preamplifier produce is respectively NF
bA, NF
rGU, NF
rA, NF
pA, gain and the noise figure of each device described are obtained by spectroanalysis instrument, concrete, spectroanalysis instrument is linked into respectively input and the output of device, obtain the light signal strength before inputting and after input and noise intensity respectively, so just can analyze gain and the noise figure of this device, such as remote gain unit, as shown in Figure 3, first the first Transmission Fibers 3 and remote gain unit 4 is disconnected, and connect spectroanalysis instrument at the output of the first Transmission Fibers 3, obtain the light signal strength before input and noise intensity, then as shown in Figure 4, after connecting the first Transmission Fibers 3 and remote gain unit 4, wavelength division multiplexer is accessed between remote gain unit 4 and the second Transmission Fibers 5, the backward pumping light that remotely pumping unit exports enters remote gain unit 4, the transmission end of wavelength division multiplexer connects polishing wax analyzer, so just can obtain the light signal strength after remote gain unit 4 amplifies and noise intensity, light signal strength before being amplified by comparison and after amplifying and noise intensity, just can record gain and the noise figure of remote gain unit 4, Fig. 5 and Fig. 6 respectively illustrates when the second Transmission Fibers length is constant, the wavelength of continuous change input optical signal, measured RGU gain and noise figure curve chart, Fig. 7 and Fig. 8 shows when input optical wavelength immobilizes, during the distance of continuous change second Transmission Fibers, measured RGU gain and noise figure curve chart, conveniently map, the pumping light power oppositely inputted with remote gain unit in Fig. 7 and Fig. 8 is for transverse axis, RGU gain and noise figure are longitudinal axis drawing, it is to be noted, remotely pumping unit provides backward pumping light for remote gain unit, after the length of change second Transmission Fibers, the pumping light power being oppositely input to remote gain unit also can constantly change, the gain of other devices is identical with noise-figure measurement method.
When changing input optical signal wavelength and/or the second Transmission Fibers length, concrete, first the second Transmission Fibers length can be fixed, in a wavelength range, (such as 1530nm ~ 1570nm) progressively adjusts input optical signal wavelength, measure gain and the noise figure of each device, then input optical signal wavelength is fixed on a wavelength value, is progressively adjusting the second Transmission Fibers length within the specific limits, then measure gain and the noise figure of each device.
The gain that step S202, basis record and noise figure obtain the output Optical Signal To Noise Ratio of Remote optical pumping amplifier, when described Optical Signal To Noise Ratio is maximum, obtain the input optical signal wavelength under current state and/or the second Transmission Fibers length.
G.692 can show that system output exports optical noise than OSNR expression formula with the definition of system equivalent noise figure according to ITU-T Rec, OSNR
out(dB)=P
in(dBm)+58-10lg (F
sys-1/G
always) wherein 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 accumulation ASE noise P that Remote optical pumping amplifier output produces
aSE is totalrepresent the cumulative of the value of ASE noise after the amplification of follow-up amplifier and optical fiber attenuation that each amplifier produces, 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-PAthe ASE noise power of power amplifier, remote gain unit, remotely pumping unit, preamplifier generation respectively, G
b, G, G
r, G
pbe the gain of power amplifier, remote gain unit, remotely pumping unit, preamplifier respectively, ASE noise power can be obtained through numerical transformation by noise figure and gain, T
1and T
2be respectively the loss of two sections of Er-doped fibers in remote gain unit, concrete loss graph of a relation as shown in Figure 7, after the length determining Transmission Fibers and input optical wavelength, just can learn 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 OSNR value, (usually experience length value is first removed when the second Transmission Fibers length is constant, such as 100km), when progressively adjusting input optical signal wavelength, when Optical Signal To Noise Ratio is maximum, input optical signal wavelength is now best input optical signal wavelength, concrete reference Remote optical pumping amplifier input signal light wavelength as shown in Figure 9 and the curve chart exporting Optical Signal To Noise Ratio, best input optical wavelength is about 1560nm as can be seen from Figure, then best input optical signal wavelength is fixed, adjust the second Transmission Fibers length again, when Optical Signal To Noise Ratio is maximum, the length of the second Transmission Fibers is now optimal spacing, concrete reference RGU and GPU different spacing as shown in Figure 10 and the curve chart exporting Optical Signal To Noise Ratio, optimal spacing is about 105km as can be seen from Figure.Equally, also first can fix input optical signal wavelength (usually choosing experience wavelength value, such as 1550nm) by calculating optimal spacing, then adjust input optical signal wavelength and obtain best input optical wavelength.Or 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 input optical signal wavelength, when described output Optical Signal To Noise Ratio maximum, input optical signal wavelength is now best input optical wavelength.
2, fixing input optical signal wavelength is a wavelength value, and progressively adjust the distance between remote gain unit and remotely pumping unit, when described output Optical Signal To Noise Ratio maximum, the length of the second Transmission Fibers is now optimal spacing.
3, after obtaining best input optical signal wavelength, more progressively adjust the distance between remote gain unit and remotely pumping unit, obtain optimal spacing further; Or after obtaining optimal spacing, more progressively adjust input optical signal wavelength, obtain best input optical wavelength further, so just can obtain best input optical wavelength and optimal spacing simultaneously, make Remote optical pumping amplifier be in optimum Working, reduce error rate of system.
embodiment two:
The raising Remote optical pumping amplifier that Figure 11 shows second embodiment of the invention to be provided exports the flow process of the method for Optical Signal To Noise Ratio, illustrate only the part relevant to the embodiment of the present invention for convenience of explanation.
The method that the raising Remote optical pumping amplifier that the present embodiment provides exports Optical Signal To Noise Ratio comprises the steps:
Step S111, input optical signal wavelength, signal power and different pump wavelength when different and pumping light power, obtain optimum length ratio and the optimum length summation of two sections of Er-doped fibers in remote gain unit, make the global noise exponential effect of remote gain unit to Remote optical pumping amplifier minimum;
Step S112, under the condition changing input optical signal wavelength and/or the second Transmission Fibers length, record gain and the noise figure of power amplifier, remote gain unit, remotely pumping unit and this four device of Optical Preamplifier respectively;
The gain that step S113, basis record and noise figure obtain the output Optical Signal To Noise Ratio of Remote optical pumping amplifier, when described Optical Signal To Noise Ratio is maximum, obtain the input optical signal wavelength under current state and/or the second Transmission Fibers length.
The present embodiment adds step S111 on the basis of embodiment one, and this step mainly configures the light channel structure of remote gain unit, makes remote gain unit have optimal light line structure, reduces remote gain unit further to the noise effect of Remote optical pumping amplifier.
The light channel structure of configuration remote gain unit as shown in figure 12, comprise two sections of Er-doped fibers 42 connected, 43, the lenth ratio of described two sections of Er-doped fibers and length summation can have influence on the performance of remote 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 at different input optical signal wavelength, when signal power and different pump wavelength and pumping light power, gain and the noise figure of configuration remote gain unit is obtained by spectroanalysis instrument, obtain optimum length ratio and the optimum length summation of Er-doped fiber at different conditions, then when designing different Remote optical pumping amplifier, select optimum optimum length ratio and optimum length summation, obtain the remote gain unit of optimal light line structure.
In the present embodiment, described Er-doped fiber preferably has the low concentration Er-doped fiber of less mode field diameter and bigger numerical aperture, and its concentration is 2.5-4.5dB/m, and absorption peak corresponding wavelength is 1530nm.Except Er-doped fiber, the remote gain unit that this enforcement provides also comprises the light isolation wavelength division multiplexing synthesizer 41,45 being located at described Er-doped fiber two ends, to reduce the junction loss and insertion loss that multiple device brings, described light isolation wavelength division multiplexing synthesizer comprises optical isolator and 1480/1550 wavelength division multiplexer integrated device, preferably, described remote 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, makes full use of the pump light of remote gain unit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. one kind is improved the method that Remote optical pumping amplifier exports Optical Signal To Noise Ratio, described Remote optical pumping amplifier comprises the optical sender (1), power amplifier (2), the first Transmission Fibers (3), remote gain unit (4), the second Transmission Fibers (5), remotely pumping unit (6), Optical Preamplifier (7) and the optical receiver (8) that connect in turn, wherein, described remote gain unit (4) comprises two sections of Er-doped fibers (42,43) connected, it is characterized in that, described method comprises:
Under the condition changing input optical signal wavelength and/or the second Transmission Fibers length, record gain and the noise figure of power amplifier, remote gain unit, remotely pumping unit and these four devices of Optical Preamplifier respectively;
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 the input optical signal wavelength under current state and/or the second Transmission Fibers length.
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, also comprise before recording the gain of power amplifier, remote gain unit, remotely pumping unit and these four devices of Optical Preamplifier and noise figure step respectively:
When different input optical signal wavelength, signal power and different pump wavelength and pumping light power, obtain optimum length ratio and the optimum length summation of two sections of Er-doped fibers in remote gain unit, make the global noise exponential effect of remote gain unit to Remote optical pumping amplifier minimum.
3. method as claimed in claim 1 or 2, it is characterized in that, the gain that described basis records and noise figure obtain the output Optical Signal To Noise Ratio of Remote optical pumping amplifier, and when described Optical Signal To Noise Ratio is maximum, the input optical signal wavelength under acquisition current state and/or the second Transmission Fibers length step specifically comprise:
When 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-PAthe ASE noise power of power amplifier, remote gain unit, remotely pumping unit, preamplifier generation respectively, G
b, G, G
r, G
pthe gain of power amplifier, remote gain unit, remotely pumping unit, preamplifier respectively, T
1and T
2be respectively the loss of two sections of Er-doped fibers in remote gain unit, h is planck constant, and ν is photon frequency, B
0for optical sender exports the bandwidth of light;
Obtain the wavelength of optical signal of described Optical Signal To Noise Ratio when maximum and/or the second Transmission Fibers length.
4. method as claimed in claim 3, it is characterized in that, described input optical signal wavelength chooses scope is 1530nm ~ 1570nm.
5. method as claimed in claim 4, it is characterized in that, the pump wavelength range of choice of described remotely pumping unit is 1460nm ~ 1490nm.
6. method as claimed in claim 5, it 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, it is characterized in that, the Er-doped fiber concentration in described remote gain unit is 2.5-4.5dB/m.
8. method as claimed in claim 7, is characterized in that, described remote gain unit (4) comprises light isolation wavelength division multiplexing synthesizer (41,45) being located at described Er-doped fiber (42) two ends.
9. method as claimed in claim 8, it is characterized in that, described remote 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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| CN104319611A (en) * | 2014-11-19 | 2015-01-28 | 天津光电通信技术有限公司 | Low-noise remote pump EDFA |
| EP3266125B1 (en) * | 2015-03-06 | 2020-04-22 | Neptune Subsea IP Limited | Optical transmission system and related remote optically pumped amplifier (ropa) and method |
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| CN106301580A (en) * | 2015-06-24 | 2017-01-04 | 国家电网公司 | Transmission method based on many bourbons road distant pump amplifying technique and system |
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