CN100433588C - Method and apparatus for Raman amplifying of dual wavelength structure with linear gain - Google Patents
Method and apparatus for Raman amplifying of dual wavelength structure with linear gain Download PDFInfo
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- CN100433588C CN100433588C CNB2004100370363A CN200410037036A CN100433588C CN 100433588 C CN100433588 C CN 100433588C CN B2004100370363 A CNB2004100370363 A CN B2004100370363A CN 200410037036 A CN200410037036 A CN 200410037036A CN 100433588 C CN100433588 C CN 100433588C
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Abstract
According to the method and apparatus for Raman amplifying of dual wavelength structure with linear gain, two pumping lights are executed a WDB wave combination and then interact with signal lights in optical fibers to generate Raman amplifying, wherein the two pumping lights are executed a pre-allocation to satisfy the following connections: A, wavelengths if the two pumping lights are set to ensure that the magnification wavelength band-width respectively fall along the linear gain zones before and after the Raman gain spectrum; B, the power ratio of the two pumping lights is set as a numerical value of N to leveling the gain spectrum in the gain bandwidth. Thus, the linear relationship of the Raman amplifying gain and the pumping source power is realized, the gain plainness degree is also ensured, the change of the Raman gain basically doesn't affect the changes of the gain plainness degree, the control of the Raman amplifier is greatly simplified and becomes more reliable; at the same time, since the field measurement of the initializtion parameters requested by controls are not necessary, the applications cost and the applications complication degree of the Raman amplifier are dramatically reduced.
Description
Technical field
The present invention relates to raman amplifier in the optical transmission field (Raman Amplifier), relate in particular to the dual wavelength structure raman amplifier that how to make dual wavelength structure raman amplifier have the method for linear gain and have linear gain.
Background technology
In optical transmission system, be that the Optical Amplification Technology of representative has replaced traditional light-electrical-optical trunking scheme with erbium-doped fiber amplifier (EDFA); In conjunction with wavelength division multiplexing (WDM) technology, when having realized in the optical fiber multipath light signal, amplifies by the EDFA amplifier, when reducing the relaying cost, but also successfully increased information transmitted capacity and transmission range in the optical fiber.
But still there are many deficiencies in the EDFA amplifier: at first be the limitation that EDFA exists service band and bandwidth; Secondly, the EDFA noise is bigger, and especially this problem is more obvious when system's cascade.For remedying the deficiency of EDFA,, begin gradually to come into operation based on the image intensifer of fiber nonlinear effect.The typical case comprises: raman amplifier and Brillouin amplifier.Particularly raman amplifier Recent study achievement is more, and beginning is practical in engineering system.
The principle of raman amplifier is based on the nonlinear effect of optical fiber: stimulated Raman scattering (SRS) is in silica fiber, and raman gain spectrum has big Raman gain bandwidth, and the main peak of a broad is arranged near 13THz.If weak signal and a heavy pumping light transmit in optical fiber simultaneously, under the suitable condition of polarization, when signal wavelength is positioned at the pump light Raman gain bandwidth, flashlight just can obtain Raman gain, and this image intensifer based on the SRS principle is exactly a raman amplifier.Raman Fiber Amplifier had been successfully applied to dwdm system in 1999.
Relative EDFA, the characteristics of raman amplifier are very outstanding: 1, can obtain all band and amplify, certainly, this needs the pumping source wavelength to select suitably, and, dispose many pumping sources can obtain than EDFA wide the gain bandwidth of Duoing; 2, gain media is a Transmission Fibers itself, can carry out the online amplification of signal, realizes non-relay transmission of long distance and remotely pumping; 3, low noise can effectively increase transmission range.Raman amplifier is with its low noise, all band amplification characteristic and can utilize Transmission Fibers to make it be subjected to extensive concern as the advantage of amplification medium.
Along with raman amplifier enters the practical stage, the gain-adjusted of raman amplifier, gain spectrum flattening degree become the important technological problems of raman amplifier control.The gain-adjusted of raman amplifier need dispose the Output optical power of each pump laser of raman amplifier, and regulating the raman amplifier pump power with when changing the flashlight gain, also needs to guarantee gain flatness.
In existing raman amplifier commercial Application and relevant patent, generally adopt the method for gathering signal light power in the wave band to realize FEEDBACK CONTROL, to realize the control of gain controlling and gain flatness, but feedback is loaded down with trivial details, controls effect simultaneously and also is subjected to environmental factor, other considerable influence of types of fiber.The major reason that control mode is loaded down with trivial details is exactly the interior common uneven part of drastic change that has adopted the Raman gain peak of effective amplification bandwidth of existing raman amplifier, though this mode is the good utilisation pump power more, but under the acting in conjunction of many pumping sources, the power relation of each pumping under the different gains is unknown, makes control become very complicated and unreliable.Just because of these reasons, existing raman amplifier technology all needs to adopt metering system to obtain to control the initialization parameter in the application of actual track, and not only the engineering application cost is big, and the management control mode of raman amplifier is also quite loaded down with trivial details.Regrettably, up to the present, though raman amplifier has begun practicality on engineering circuit, these difficulties that it runs into are gone back the effective solution of neither one and are appeared in the public technology.
Summary of the invention
Technical problem to be solved by this invention is: overcome gain controlling, the difficult problem of gain flatness control that existing raman amplifier technology runs into, use maximum dual wavelength structure raman amplifiers at present engineering, proposed a kind of Raman amplification method that has linear gain and in amplifying bandwidth, guarantee gain flatness.
Another object of the present invention is based on above-mentioned Raman amplification method, and a kind of dual wavelength structure raman amplifier that has linear gain and guarantee gain flatness in amplifying bandwidth is provided.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of dual wavelength structure Raman amplification method with linear gain, two pump lights act in fiber medium with flashlight after WDM closes ripple, produce Raman and amplify, and described two pump lights are carried out pre-configured, make it satisfy following relationship:
A, two pumping light wavelengths are set, make and amplify wavelength bandwidth and drop on raman gain spectrum before and after edge linear gain district respectively;
B, the power ratio that two pump lights are set are a numerical value of N, make the gain spectrum flattening in the gain bandwidth.
Described Raman amplification method, wherein, described steps A comprises following processing:
Wavelength bandwidth W=f is amplified in 2C, definition
H-f
L, wherein, f
HBe the upper bound frequency of required gain bandwidth, f
LIt is the lower bound frequency of gain bandwidth;
The top, forward position of 2D, definition raman gain spectrum is A (f
A, g
A), the back is B (F along the top
B, g
B);
2E, make the output frequency of described two pump lights satisfy following relationship respectively:
f
1＝f
L-f
B f
2＝f
H-f
A；
2F, then described two pumping light wavelengths are respectively λ
1=c/f
1, λ
2=c/f
2, wherein c is the light velocity in the vacuum.
Described Raman amplification method, wherein, described f
ABe set at 13THz, described f
BBe set at 14.55THz.
Described Raman amplification method, wherein, described step B comprises following processing:
4G, from described A point along raman gain spectrum forward position choice point C (f
c, g
c), make the C point satisfy f
A-f
C=W;
4H, from described B point along raman gain spectrum after along choice point D (f
D, g
D), make the D point satisfy f
D-f
B=W;
Raman gain spectral curve between 4I, foundation described some A, C, the slope that simulates straight line is K1; According to Raman gain spectral curve between described some B, the D, the slope that simulates straight line is K2, and described K1, K2 one positive are negative;
The power proportions N of 4J, described two pump lights satisfies following relation: K1+N*K2=0.
Dual wavelength structure Raman amplifying device with linear gain, comprise: pumping Optical Multiplexer Unit, WDM close ripple unit, pumping light power detecting unit, two pump laser unit, also comprise the pump power ratio control unit, the Output optical power ratio that described pump power ratio control unit receives the detected signal of pumping light power detecting unit and controls two pump unit is N=-K1/K2; The output light wavelength of described two pump laser unit is foundation respectively
f
1＝f
L-f
B f
2＝f
H-f
A；
λ
1=c/f
1λ
2=c/f
2Wherein c is that the light velocity is determined in the vacuum.
Described Raman amplifying device, wherein, described pump power ratio control unit comprises CPU element, two DAC unit, two driver elements, described CPU receives the detected signal of described pumping light power detecting unit and exports one and adjust signal to described two DAC unit, adjustment signal after described two DAC cell translation amplifies output by described two driver elements respectively, controls the ratio of the Output optical power of described two pump laser unit.
Beneficial effect of the present invention is: the present invention is because pre-configured by to the pumping wavelength of dual wavelength structure raman amplifier, selected the front and back end linear gain part of raman gain spectrum, thereby realized the linear relationship of raman amplification gain and pumping source power, made the control of raman amplifier and simplify, control also more reliable greatly because linear relationship is arranged; Simultaneously, owing to use the linear segment of raman gain spectrum, and the allocation proportion of control pump power on two wavelength is N: 1, therefore also guaranteed gain flatness, changing Raman gain does not influence the change of gain flatness substantially, and this has greatly simplified the control of raman amplifier.Simultaneously, those control needed initialization parameter owing to no longer need in-site measurement, and this also obviously descends the application cost of raman amplifier, application complexity.
Description of drawings
Fig. 1 is a Raman effect gain spectrogram;
Fig. 2 is the design sketch that linear superposition of the present invention obtains flat gain in certain bandwidth;
Fig. 3 is the dual wavelength structure Raman amplifier structure figure with linear gain of the present invention;
Fig. 4 is the 3.2THz amplification bandwidth gain spectrogram as the embodiment of the invention;
Fig. 5 is as each frequency dB gain and gain difference figure in the amplification bandwidth of the embodiment of the invention;
Fig. 6 is the pump power ratio control unit structure chart as the embodiment of the invention
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention's raman amplifier at the dual wavelength structure, core concept of the present invention is: undertaken pre-configured by the pumping wavelength to the raman amplifier of dual wavelength structure, make and amplify the uneven gain section of drastic change that does not comprise raman gain spectrum in the wavelength bandwidth, and the front and back end linear gain part of selection raman gain spectrum is being amplified the linear relationship that obtains Raman gain and pump power in the bandwidth under the acting in conjunction in double pumping action source; Simultaneously, owing to use the linear segment of raman gain spectrum, also guaranteed gain flatness.
From Fig. 1 Raman gain spectrogram, A is to being the Raman gain peak value between the B point, though gain is high, gain fluctuation is the uneven part of great change of raman gain spectrum very greatly, gain controlling is difficulty very, and this part gain bandwidth is usually located near pumping wavelength skew 13THz～14.5THz interval; And it is interval and behind raman gain spectrum, have the approximately linear feature in one section interval backward along raman gain spectrum forward position top A point along top B point to the last period.For realizing linear gain, the present invention designs the wavelength of two pumping sources and avoids the uneven part of raman gain spectrum great change, make the Raman of one of them pumping source amplify forward position that contribution is positioned at raman gain spectrum promptly interval 1, and the Raman of another pumping source amplifies back edge that contribution is positioned at raman gain spectrum promptly interval 2, use the sacrificial section pump power, exchange the Linear Control of gain for, and because gain peak is closed in interval 1 and interval 2, so also can too not lose pump power.Because the linear segment forward position of raman gain spectrum interval 1 is different along interval 2 slope absolute value with the back, for guaranteeing to amplify the flatness of raman gain spectrum in the bandwidth, by controlling the output pumping light power ratio N of two pumping sources, reach the change Raman gain and do not influence the change of gain flatness substantially.
The concrete process method step of the present invention is as follows:
1, determines to use needed gain bandwidth W=f
H-f
L, wherein, f
HBe the upper bound frequency of required gain bandwidth, f
LIt is the lower bound frequency of gain bandwidth;
2, select the W bandwidth range from the forward position of Raman gain spectral curve.For effectively utilizing pump power, from A point [coordinate, (f
A, g
A)] to select bandwidth along the forward position be the some C[coordinate of W, (f
c, g
c)], wherein, f
A-f
c=W; The A point can be selected according to the practical application condition, and it is positioned at the top in raman gain spectrum forward position, the typical case be set to (13THz, 7.94E-4).
3, select the scope of W bandwidth from the back edge of Raman gain spectral curve.For effectively utilizing pump power, from B point [coordinate, (f
B, g
B)] be the some D[coordinate of W along the back along selecting bandwidth, (f
D, g
D)], wherein, f
D-f
B=W; The B point can be selected according to the practical application condition, and it is positioned at the top on edge behind the raman gain spectrum, modular design be (14.55THz, 7.85E-4).
4, according to (f
A, g
A), (f
c, g
c) between the Raman gain spectral curve, simulate straight line, its slope is K1.As shown in Figure 2, fitting a straight line is y=k1x
5, according to (f
B, g
B), (f
D, g
D) between the Raman gain spectral curve, simulate straight line, its slope is K2.As shown in Figure 2, fitting a straight line is y=k2x, and K1, K2 one positive are negative.
6,, calculate N, the Output optical power ratio of Here it is two pumping sources according to K1+N*K2=0.
7, the output light frequency of determining two pumping sources is respectively: f
1=f
L-f
B, f
2=f
H-f
A, corresponding wavelength is respectively: λ
1=c/f
1, λ
2=c/f
2, wherein c is the light velocity in the vacuum.
8, according to above-mentioned configuration, the pumping wavelength that dual wavelength structure raman amplifier is set is λ
1, λ
2, pump power is assigned as N on two wavelength: 1.
As seen, y=(Nk1+k2) x is a smooth straight line from Fig. 2, this shows, raman amplifier pumping gross power is regulated in the setting according to 8, and amplifier gain is with the pump power linear change, and it is smooth that the gain spectral in the gain bandwidth W keeps.
According to said method, the present invention has constructed a kind of raman amplifier device of dual wavelength structure, referring to Fig. 3.This device comprises two pump laser unit 3,4, pumping Optical Multiplexer Unit 2, WDM close ripple unit 1, pumping light power detecting unit 5, also comprise pump power ratio control unit 6, and the output light wavelength of two pump laser unit is set to λ according to method 7
1And λ
2Described pumping light power detecting unit 5 detects the pumping Output optical power of described pumping laser unit 4, pumping laser unit 3, and detecting data passes to described pump power ratio control unit 6.The N that described pump power ratio control unit 6 is determined according to method 6: the Output optical power ratio of two pump unit of 1 proportional control.Described pumping Optical Multiplexer Unit 2 closes pumping laser unit, road 4 and pumping laser unit 3 pump light of N output in proportion, and is delivered to described WDM and closes ripple unit 1 closing the road pump light.Pump light closes ripple unit 1 through WDM, acts in fiber medium with flashlight, produces Raman and amplifies.
Further specify the present invention for an embodiment below.
If required amplification bandwidth requirement is 3.2THz, its working frequency range is 192.1THz～195.3THz.
According to method 1, obtain f
H=195.3THz, f
L=192.1THz, W=3.2THz
According to method 2, the A point be (13THz, 7.94E-4), C point f
c=f
A-W=9.8THz, C point be (9.8THz, 5.68487E-4)
According to method 3, the B point be (14.55THz, 7.85E-4), D point f
D=f
B+ W=17.75THz, D point be (17.75THz, 1.98296E-4)
According to method 4, according to (f
A, g
A), (f
c, g
c) between the Raman gain spectral curve, simulate straight line, its slope K 1=7.16481E-17
According to method 5, according to (f
B, g
B), (f
D, g
D) between the Raman gain spectral curve, simulate straight line, its slope K 2=-1.72728E-16.K1, K2 one positive are negative.
According to method 6, K1+N*K2=0, pump power ratio N=-K1/K2=0.41
According to method 7, the pump light frequency that two pumping sources of raman amplifier should be set is respectively f
1=f
L-f
B=177.55THz, f
2=f
H-f
A=182.3THz, corresponding wavelength is respectively: λ
1=c/f
1, λ
2=c/f
2, wherein c is the light velocity in the vacuum.
Claims (4)
1. dual wavelength structure Raman amplification method with linear gain, two pump lights act in fiber medium with flashlight after WDM closes ripple, the generation Raman amplifies, and it is characterized in that: described two pump lights are carried out pre-configured, make it satisfy following relationship:
A, two pumping light wavelengths are set, make and amplify wavelength bandwidth and drop on raman gain spectrum before and after edge linear gain district respectively, comprise following processing:
Wavelength bandwidth W=f is amplified in 2C, definition
H-f
L, wherein, f
HBe the upper bound frequency of required gain bandwidth, f
LIt is the lower bound frequency of gain bandwidth;
The top, forward position of 2D, definition raman gain spectrum is A (f
A, g
A), the back is B (f along the top
B, g
B);
2E, make the output frequency of described two pump lights satisfy following relationship respectively:
f
1＝f
L-f
B f
2＝f
H-f
A；
2F, then described two pumping light wavelengths are respectively λ
1=c/f
1, λ
2=c/f
2, wherein c is the light velocity in the vacuum;
B, the power output ratio that two pump lights are set are a numerical value of N, make the gain spectrum flattening in the gain bandwidth, comprise following processing:
4G, from described A point along raman gain spectrum forward position choice point C (f
c, g
c), make the C point satisfy f
A-f
c=W;
4H, from described B point along raman gain spectrum after along choice point D (f
D, g
D), make the D point satisfy f
D-f
B=W;
Raman gain spectral curve between 4I, foundation described some A, C, the slope that simulates straight line is K1; According to Raman gain spectral curve between described some B, the D, the slope that simulates straight line is K2, and described K1, K2 one positive are negative;
The power output ratio N of 4J, described two pump lights satisfies following relation: K1+N*K2=0.
2. Raman amplification method according to claim 1 is characterized in that: described f
ABe set at 13THz, described f
BBe set at 14.55THz.
3. the dual wavelength structure Raman amplifying device that produces according to the described method of claim 1 with linear gain, comprise: pumping Optical Multiplexer Unit, WDM close ripple unit, pumping light power detecting unit, two pump laser unit, it is characterized in that: also comprise the pump power ratio control unit, the optical output power ratio that described pump power ratio control unit receives the detected signal of pumping light power detecting unit and controls two pump unit is N=-K1/K2; The output light wavelength of described two pump laser unit is foundation respectively
f
1＝f
L-f
B f
2＝f
H-f
A；
λ
1=c/f
1λ
2=c/f
2Wherein c is that the light velocity is determined in the vacuum.
4. Raman amplifying device according to claim 3, it is characterized in that: described pump power ratio control unit comprises CPU element, two DAC unit, two driver elements, described CPU receives the detected signal of described pumping light power detecting unit and exports one and adjust signal to described two DAC unit, adjustment signal after described two DAC cell translation amplifies output by described two driver elements respectively, controls the ratio of the optical output power of described two pump laser unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100370363A CN100433588C (en) | 2003-12-12 | 2004-04-23 | Method and apparatus for Raman amplifying of dual wavelength structure with linear gain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200310123614 | 2003-12-12 | ||
| CN200310123614.0 | 2003-12-12 | ||
| CNB2004100370363A CN100433588C (en) | 2003-12-12 | 2004-04-23 | Method and apparatus for Raman amplifying of dual wavelength structure with linear gain |
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| Publication Number | Publication Date |
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| CN100433588C true CN100433588C (en) | 2008-11-12 |
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| CN109088300B (en) * | 2018-08-30 | 2020-01-03 | 吉林省科英激光股份有限公司 | Three-wavelength laser generator with built-in power detection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1334484A (en) * | 2000-07-21 | 2002-02-06 | 住友电气工业株式会社 | Raman amplifier |
| US6486466B1 (en) * | 1999-04-28 | 2002-11-26 | Tyco Telecommunications (Us) Inc. | Wide bandwidth raman amplifier having a substantially flat gain profile |
| US20020186456A1 (en) * | 2001-06-07 | 2002-12-12 | Sumitomo Electric Industries, Ltd. | Raman amplifier, raman amplifier control method, and optical communication system |
| CN1449131A (en) * | 2001-10-31 | 2003-10-15 | 日本电气株式会社 | Optical fiber transmission system, raman gain control device and raman gain control method |
-
2004
- 2004-04-23 CN CNB2004100370363A patent/CN100433588C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486466B1 (en) * | 1999-04-28 | 2002-11-26 | Tyco Telecommunications (Us) Inc. | Wide bandwidth raman amplifier having a substantially flat gain profile |
| CN1334484A (en) * | 2000-07-21 | 2002-02-06 | 住友电气工业株式会社 | Raman amplifier |
| US20020186456A1 (en) * | 2001-06-07 | 2002-12-12 | Sumitomo Electric Industries, Ltd. | Raman amplifier, raman amplifier control method, and optical communication system |
| CN1449131A (en) * | 2001-10-31 | 2003-10-15 | 日本电气株式会社 | Optical fiber transmission system, raman gain control device and raman gain control method |
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Inventor after: Li Yanlin Inventor after: Liang Yuee Inventor after: Qi Yali Inventor after: Ren Jilin Inventor after: Wu Zhiping Inventor after: Yin Wang Inventor after: Zhang Jianyu Inventor before: Zheng Yi |
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Effective date of registration: 20171020 Address after: 421600, No. 1, group 5, Qingyun village, Hengyang Town, Qidong County, Hunan Co-patentee after: Liang Yuee Patentee after: Li Yanlin Co-patentee after: Qi Yali Co-patentee after: Ren Jilin Co-patentee after: Wu Zhiping Co-patentee after: Yin Wang Co-patentee after: Zhang Jianyu Address before: 518057 Nanshan District, Guangdong high tech Industrial Park, science and Technology Industrial Park, ZTE building, block A, layer 6, layer Patentee before: ZTE Corporation |
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