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CN203069942U - Gain-flattened Raman fiber wavelength conversion coupler - Google Patents

Gain-flattened Raman fiber wavelength conversion coupler Download PDF

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CN203069942U
CN203069942U CN 201320066819 CN201320066819U CN203069942U CN 203069942 U CN203069942 U CN 203069942U CN 201320066819 CN201320066819 CN 201320066819 CN 201320066819 U CN201320066819 U CN 201320066819U CN 203069942 U CN203069942 U CN 203069942U
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optical fiber
wavelength
signal light
light
section
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徐军华
李栋
赵云
左旭
袁心易
冷斌
侯斌
侯雪梅
巩明辉
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Xian University of Posts and Telecommunications
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Abstract

本实用新型公开了一种增益平坦的拉曼光纤波长转换耦合器，包括信号光发生器、掺铒光纤放大器、多个探测光激光器、连续泵浦激光器和第一合波器，信号光发生器与掺铒光纤放大器的连接，掺铒光纤放大器与第一合波器连接，多个探测光激光器均与第一合波器相接，第一合波器的输出端通过第一段第三光纤连接有第一分波器，第一分波器的输出端连接有第二合波器，连续泵浦激光器与第二合波器相接，第二合波器的输出端通过第二段第三光纤连接有第二分波器。本实用新型结构简单，设计合理，实现方便且成本低，转换速率高，输出信号消光比好，可以实现跨波段转换和多波长同时转换，能够实现增益平坦，实用性强，使用效果好，便于推广使用。

The utility model discloses a Raman optical fiber wavelength conversion coupler with flat gain, which comprises a signal light generator, an erbium-doped fiber amplifier, a plurality of detection light lasers, a continuous pump laser and a first wave combiner, and a signal light generator The connection with the erbium-doped fiber amplifier, the erbium-doped fiber amplifier is connected with the first wave combiner, and the multiple probe lasers are all connected with the first wave combiner, and the output end of the first wave combiner passes through the first segment of the third optical fiber The first wave splitter is connected, the output end of the first wave splitter is connected with the second wave combiner, the continuous pump laser is connected with the second wave combiner, and the output end of the second wave combiner passes through the second stage The three-fiber connection has a second splitter. The utility model has the advantages of simple structure, reasonable design, convenient realization and low cost, high conversion rate, good output signal extinction ratio, can realize cross-band conversion and multi-wavelength conversion at the same time, can realize flat gain, strong practicability, good use effect, and convenient Promotional use.

Description

The Raman fiber wavelength conversion coupling mechanism of flat gain
Technical field
The utility model belongs to the optical communication technique field, especially relates to a kind of Raman fiber wavelength conversion coupling mechanism of flat gain.
Background technology
Wavelength-division multiplex technique is high-speed wideband high-capacity optical fiber communication technology one preferred technique.In the optical cross connection node of wavelength division multiplexing communications systems, when two identical wavelength signals enter in the same optical fiber in the different fiber, just produced the wavelength blocker problem.Because system's various factors restriction, the every reusable wavelength number of optical fiber is limited, therefore this situation will inevitably occur at the optical switch node place.The effective ways that address this problem adopt the wavelength switch technology exactly, and an one signal wavelength is transformed into other wavelength, thereby avoid the wavelength blocker among the OXC.Another important use of Wavelength conversion devices is exactly to realize Wavelength matched between the different optical-fiber networks, and the different wave length series of products unification that can produce different vendor, different times realize internetwork communication on unified standard of wavelength.In addition, by wavelength shifter, can strengthen dirigibility, the reliability of network reconfiguration, network management, cooperate the wavelength-division switch can realize functions such as wavelength route.
The multi-wavelength converter is mainly used to increase transmission bandwidth and the transmission range of network, and reduces the cost of the network capacity extension greatly.The multi-wavelength converter can make network capacity increase exponentially rapidly under the situation that does not influence original business, the security that improves network greatly simultaneously.
Realize that at present the wavelength conversion mainly contains two big methods:
(1) light/electricity-electricity/light method, comparative maturity on this method and technology, working stability has been used for wavelength conversion development in optical fiber telecommunications system, ripe commercial product is arranged.But its shortcoming is the apparatus structure complexity, and cost increases with speed and parts number, the power consumption height, and this is restricted its application in the multi-wavelength channel system, and does not possess transmission pattern and rate transparency, when system need upgrade, exchange device more.
(2) All Optical Wavelength Conversion method utilizes the nonlinear effect of some medium that the light signal of input is directly transferred on the new wavelength exactly, is conducive to system upgrade, dilatation.The method of All Optical Wavelength Conversion is a lot of at present, mainly contains cross-gain mudulation effect in the based semiconductor image intensifer, cross-phase modulation effect, cross polarization mudulation effect, four-wave mixing effect; Absorb mudulation effect based on intersecting in the electroabsorption modulator; Based on the cascade in the periodically poled lithium niobate waveguide and frequency, beat effect; Based on cross-phase modulation effect, four-wave mixing effect in the dispersion shift highly nonlinear optical fiber; Based on cross-phase modulation effect, four-wave mixing effect in the silicon nanometer fibre; Based on cross-phase modulation effect, four-wave mixing effect, cross polarization mudulation effect in the dispersed flat photon crystal fiber; Based on cross-phase modulation effect, four-wave mixing effect in the sulfide waveguide, based on four-wave mixing effect in the carbon mano-tube composite etc.; But these methods are in the relative merits that all exist aspect system architecture, operating rate, device cost, wavelength conversion range, the polarization sensitivity separately.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of Raman fiber wavelength conversion coupling mechanism of flat gain is provided, and it is simple in structure, and is reasonable in design, realization is convenient and cost is low, the switching rate height, the output signal extinction ratio is good, can realize striding wave band conversion and multi-wavelength and change simultaneously, can realize flat gain, practical, result of use is good, is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of Raman fiber wavelength conversion coupling mechanism of flat gain, it is characterized in that: comprise the flashlight generator for output signal light, be used for the flashlight of flashlight generator output is amplified the Erbium-Doped Fiber Amplifier (EDFA) that forms pump signal light, the continuous pump laser that is used for exporting a plurality of detection light lasers of a plurality of continuous probe light and is used for the continuous pump light of output, and be used for first wave multiplexer that described pump signal light and a plurality of continuous probe light are coupled, the output terminal of described flashlight generator is connected with the input end of described Erbium-Doped Fiber Amplifier (EDFA) by first optical fiber, the output terminal of described Erbium-Doped Fiber Amplifier (EDFA) is connected with the input end of described first wave multiplexer by first optical fiber, the output terminal of a plurality of described detection light lasers corresponding input end by many second optical fiber and described first wave multiplexer respectively joins, the output terminal of described first wave multiplexer is by being connected with first channel-splitting filter for a plurality of detection light after the output wavelength conversion for first section the 3rd optical fiber that carries out the wavelength conversion by the stimulated Raman scattering amplification process, the output terminal of described first channel-splitting filter is connected with for also second wave multiplexer of each unequal flashlight of output power that a plurality of detection light after described continuous pump light and the wavelength conversion are coupled by many 4th optical fiber, described continuous pump laser joins by the input end of the 5th optical fiber and described second wave multiplexer, the output terminal of described second wave multiplexer is connected with second channel-splitting filter of the switching signal light that equates for the Output optical power value by second section the 3rd optical fiber that is used for each unequal flashlight of power to described second wave multiplexer output and carries out gain compensation, the centre wavelength of a plurality of described detection light lasers have nothing in common with each other and a plurality of described detection light laser in any one central wavelength lambda iAll greater than the central wavelength lambda of described flashlight generator 1Central wavelength lambda with described continuous pump laser P, and
Figure BDA00002820556600031
Span be 400cm -1～450cm -1,
Figure BDA00002820556600032
Span be 490cm -1～540cm -1, wherein, i is that the value of the number of channel and i is 2～N, N is total number of channels and is integer.
The Raman fiber wavelength conversion coupling mechanism of above-mentioned flat gain is characterized in that: described flashlight generator increases modulator by the pulsed laser, pseudo-random sequence generator and the horse that are electrically connected successively and constitutes.
The Raman fiber wavelength conversion coupling mechanism of above-mentioned flat gain, it is characterized in that: described first section the 3rd optical fiber and second section the 3rd optical fiber are highly nonlinear optical fiber, and described highly nonlinear optical fiber nonlinear factor scope in the wavelength coverage of 1370nm～1700nm is 10W -1Km -1～37W -1Km -1, the nonlinear factor of described highly nonlinear optical fiber at wavelength 1550nm place is 36.2W -1Km -1, described highly nonlinear optical fiber is 0～0.6ps/ (nmkm) in the wavelength coverage internal dispersion value scope of 1370nm～1700nm, described highly nonlinear optical fiber is-0.2～0.2 in the wavelength coverage internal dispersion slope range of 1370nm～1700nm.
The Raman fiber wavelength conversion coupling mechanism of above-mentioned flat gain, it is characterized in that: the effective interaction length L of described first section the 3rd optical fiber and the effective interaction length L ' of described second section the 3rd optical fiber satisfy computing formula: [kP p(0) L+k ' P p' (0) L ']=0, wherein, k is that first section the 3rd fiber optic frequency shifter scope is 400cm -1～450cm -1Interior raman gain efficiency fitting a straight line slope and value are 2.0 * 10 -3Km -1W -1/ cm -1, k' is that second section the 3rd fiber optic frequency shifter scope is 490cm -1～540cm -1Interior raman gain efficiency fitting a straight line slope and value are-8.2 * 10 -3Km -1w -1/ cm -1, P p(0) is the peak power of described pump signal light in first section the 3rd optical fiber, P p' (0) is the peak power of described continuous pump light in second section the 3rd optical fiber.
The utility model compared with prior art has the following advantages:
1, of the present utility model simple in structure, reasonable in design, it is convenient to realize.
2, the utility model is keeping phase place and the amplitude information of signal light-wave than normal optical-electrical-optical wavelength shifter in wavelength conversion, has the strict transmission transparency.
3, realization cost of the present utility model is low, and cost is than low many of normal optical-electrical-optical wavelength shifter, and information translation that can flashlight is entrained is on a plurality of different continuous probe light.
4, the spontaneous emission noise of the utility model in wavelength-conversion process is low, can realize the counter-rotating of warbling.
5, the method that adopts the utility model to carry out the conversion of Raman wavelength realizes simply, the switching rate height, and the output signal extinction ratio is good, and can realize striding the wave band conversion.
6, the utility model has realized treating the amplification of Wavelength-converting signal when carrying out the wavelength conversion, and can carry out gain compensation to the flashlight after the multi-wavelength conversion, makes the signal light power of final output equate, realizes flat gain.
7, of the present utility model practical, result of use is good, is convenient to promote the use of.
In sum, the utility model is simple in structure, and is reasonable in design, and realization is convenient and cost is low, the switching rate height, the output signal extinction ratio is good, can realize striding wave band conversion and multi-wavelength and change simultaneously, can realize flat gain, practical, result of use is good, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the luminous power synoptic diagram of the utility model pump signal light.
Fig. 3 a is the luminous power synoptic diagram that the utility model first is surveyed first continuous probe light of light laser output.
Fig. 3 b is the luminous power synoptic diagram that the utility model second is surveyed second continuous probe light of light laser output.
Fig. 3 c is the luminous power synoptic diagram that the utility model the 3rd is surveyed the 3rd continuous probe light of light laser output.
Fig. 3 d is the luminous power synoptic diagram that the utility model the 4th is surveyed the 4th continuous probe light of light laser output.
Fig. 4 carries out the luminous power synoptic diagram of wavelength conversion back pump signal light for the utility model.
Fig. 5 a is the luminous power synoptic diagram that the utility model carries out wavelength conversion back first continuous probe light.
Fig. 5 b is the luminous power synoptic diagram that the utility model carries out wavelength conversion back second continuous probe light.
Fig. 5 c is the luminous power synoptic diagram that the utility model carries out wavelength conversion back the 3rd continuous probe light.
Fig. 5 d is the luminous power synoptic diagram that the utility model carries out wavelength conversion back the 4th continuous probe light.
Fig. 6 is the luminous power synoptic diagram of the continuous pump light of the continuous pump laser output of the utility model.
Fig. 7 a is the luminous power synoptic diagram that the utility model carries out first continuous probe light behind the gain compensation.
Fig. 7 b is the luminous power synoptic diagram that the utility model carries out second continuous probe light behind the gain compensation.
Fig. 7 c is the luminous power synoptic diagram that the utility model carries out the 3rd continuous probe light behind the gain compensation.
Fig. 7 d is the luminous power synoptic diagram that the utility model carries out the 4th continuous probe light behind the gain compensation.Description of reference numerals:
1-flashlight generator; 2-Erbium-Doped Fiber Amplifier (EDFA); 3-detection light laser;
4-continuously pump lasers; 5-the first wave multiplexer; 6-the first optical fiber;
7-the second optical fiber; 8-the first section the 3rd optical fiber; 9-the first channel-splitting filter;
10-the four optical fiber; 11-the second wave multiplexer; 12-the five optical fiber;
Second section the 3rd optical fiber of 13-; 14-second channel-splitting filter.
Embodiment
As shown in Figure 1, the utility model comprises the flashlight generator 1 for output signal light, be used for the flashlight of flashlight generator 1 output is amplified the Erbium-Doped Fiber Amplifier (EDFA) 2 that forms pump signal light, the continuous pump laser 4 that is used for exporting a plurality of detection light lasers 3 of a plurality of continuous probe light and is used for the continuous pump light of output, and be used for first wave multiplexer 5 that described pump signal light and a plurality of continuous probe light are coupled, the output terminal of described flashlight generator 1 is connected with the input end of described Erbium-Doped Fiber Amplifier (EDFA) 2 by first optical fiber 6, the output terminal of described Erbium-Doped Fiber Amplifier (EDFA) 2 is connected with the input end of described first wave multiplexer 5 by first optical fiber 6, the output terminal of a plurality of described detection light lasers 3 is corresponding respectively to join by the input end of many second optical fiber 7 with described first wave multiplexer 5, the output terminal of described first wave multiplexer 5 is by being connected with first channel-splitting filter 9 for a plurality of detection light after the output wavelength conversion for first section the 3rd optical fiber 8 that carries out the wavelength conversion by the stimulated Raman scattering amplification process, the output terminal of described first channel-splitting filter 9 is connected with for also second wave multiplexer 11 of each unequal flashlight of output power that a plurality of detection light after described continuous pump light and the wavelength conversion are coupled by many 4th optical fiber 10, described continuous pump laser 4 joins by the input end of the 5th optical fiber 12 with described second wave multiplexer 11, the output terminal of described second wave multiplexer 11 is connected with second channel-splitting filter 14 of the switching signal light that equates for the Output optical power value by second section the 3rd optical fiber 13 that is used for each unequal flashlight of power to 11 outputs of described second wave multiplexer and carries out gain compensation, the centre wavelength of a plurality of described detection light lasers 3 have nothing in common with each other and a plurality of described detection light laser 3 in any one central wavelength lambda iAll greater than the central wavelength lambda of described flashlight generator 1 1Central wavelength lambda with described continuous pump laser 4 P, and
Figure BDA00002820556600061
Span be 400cm -1～450cm -1,
Figure BDA00002820556600062
Span be 490cm -1～540cm -1, wherein, i is that the value of the number of channel and i is 2～N, N is total number of channels and is integer.
In the present embodiment, described flashlight generator 1 increases modulator 1-3 by the pulsed laser 1-1, the pseudo-random sequence generator 1-2 that are electrically connected successively and horse and constitutes.
In the present embodiment, described first section the 3rd optical fiber 8 and second section the 3rd optical fiber 13 are highly nonlinear optical fiber, and described highly nonlinear optical fiber nonlinear factor scope in the wavelength coverage of 1370nm～1700nm is 10W -1Km -1～37W -1Km -1, the nonlinear factor of described highly nonlinear optical fiber at wavelength 1550nm place is 36.2W -1Km -1Described highly nonlinear optical fiber is 0～0.6ps/ (nmkm) in the wavelength coverage internal dispersion value scope of 1370nm～1700nm, described highly nonlinear optical fiber is-0.2～0.2 in the wavelength coverage internal dispersion slope range of 1370nm～1700nm, this fibre-optical dispersion almost flat, between the different caused signals of the corresponding group velocity of can effectively avoiding not sharing the same light walk from, be conducive to the synchronous transmission of pump signal light and continuous probe light; Continuous and the wide 40THz that reaches of the raman gain spectrum of this optical fiber.
In the present embodiment, the effective interaction length L of described first section the 3rd optical fiber 8 and the effective interaction length L ' of described second section the 3rd optical fiber 13 satisfy computing formula: [kP p(0) L+k ' P p' (0) L ']=0, wherein, k is that first section the 3rd optical fiber 8 frequency swing is 400cm -1～450cm -1Interior raman gain efficiency fitting a straight line slope and value are 2.0 * 10 -3Km -1W -1/ cm -1, k' is that second section the 3rd optical fiber 13 frequency swing is 490cm -1～540cm -1Interior raman gain efficiency fitting a straight line slope and value are-8.2 * 10 -3Km -1w -1/ cm -1, P p(0) is the peak power of described pump signal light in first section the 3rd optical fiber 8, P p' (0) is the peak power of described continuous pump light in second section the 3rd optical fiber 13.
Adopt the utility model to carry out the method for wavelength conversion, may further comprise the steps:
Step 1, selection centre wavelength are λ 1Flashlight generator 1, flashlight generator 1 output signal light also is transferred to Erbium-Doped Fiber Amplifier (EDFA) 2 through first optical fiber 6; In the present embodiment, select central wavelength lambda 1The flashlight generator 1 of=1455nm;
Step 2, the flashlight of exporting by 2 pairs of flashlight generators of Erbium-Doped Fiber Amplifier (EDFA) 1 carry out power amplification formation pump signal light, make the power of described pump signal light meet or exceed the threshold value of stimulated Raman scattering effect, and described pump signal light is transferred to first wave multiplexer 5 by first optical fiber 6; In the present embodiment, the luminous power synoptic diagram of described pump signal light as shown in Figure 2; Among Fig. 2, horizontal ordinate is represented time t, and unit is psec ps; Ordinate is represented luminous power P, and unit is watt W; " 1 " sign indicating number power is 5W;
Step 3, according to frequency displacement computing formula Δ v=(1/ λ 1)-(1/ λ i) the detection light laser 3 of selecting a plurality of centre wavelengths to have nothing in common with each other, wherein λ iBe any one centre wavelength in a plurality of described detection light lasers 3, a plurality of described detection light lasers 3 a plurality of continuous probe light of output also are transferred to first wave multiplexer 5 through too much root second optical fiber 7; Wherein, Δ v is that the span of frequency shift amount Δ v is 400cm -1450cm -1, this span is in the higher zone of Raman gain in the raman gain spectrum, and the Raman gain coefficienct in this frequency swing is higher; Namely survey in the light laser 3 central wavelength lambda of any one iSpan be 1544.8nm～1556.9nm; In the present embodiment, get Δ v and be respectively 400cm -1, 402.9cm -1, 406.2cm -1And 409.6cm -1The centre wavelength of selecting four equally spaced detection light lasers 3 of wavelength is respectively 1544.8nm, 1545.6nm, 1546.4nm and 1547.2nm, the wavelength spacing is 0.8nm, be that channel spacing is 0.8nm, centre wavelength be the luminous power synoptic diagram of first of 1544.8nm first continuous probe light of surveying light laser 3 outputs shown in Fig. 3 a, luminous power is constant value 1 * 10 -6W; Centre wavelength be the luminous power synoptic diagram of second of 1545.6nm second continuous probe light of surveying light laser 3 outputs shown in Fig. 3 b, luminous power is constant value 1 * 10 -6W; Centre wavelength be the luminous power synoptic diagram of the 3rd of 1546.4nm the 3rd continuous probe light of surveying light laser 3 outputs shown in Fig. 3 c, luminous power is constant value 1 * 10 -6W; Centre wavelength be the luminous power synoptic diagram of the 4th of 1544.8nm the 4th continuous probe light of surveying light laser 3 outputs shown in Fig. 3 d, luminous power is constant value 1 * 10 -6W; Among Fig. 3 a～4d, horizontal ordinate is all represented time t, and unit is psec ps; Ordinate is all represented luminous power P, and unit is watt W;
Step 4, by first wave multiplexer 5 a plurality of continuous probe optically-coupled that the described pump signal light of first optical fiber 6 transmission and many second optical fiber 7 transmit respectively are input in first section the 3rd optical fiber 8;
Step 5, first section the 3rd optical fiber 8 are according to formula
P 1 i = P i ( t - z / u ) · e - αz · e - G 1 i , i = 2 . . . N G 1 i = - k λ 1 MA ( v ~ 1 - v ~ i ) · P 1 ( t - z / u ) · v ‾ v 1 · L , i = 2 . . . N L = 1 - e - αz α
And carry out wavelength conversion by the stimulated Raman scattering amplification process, with information translation entrained on the pump signal light on a plurality of continuous probe light and be transferred to first channel-splitting filter 9; Wherein, P 1iWhen transmitting in first section the 3rd optical fiber 8 for continuous probe light and the luminous power of pump signal light after interacting, α is the attenuation coefficient of luminous power in first section the 3rd optical fiber 8, z is the distance that light transmits in first section the 3rd optical fiber 8, t is the used time of transmission range z, u is the group velocity of light in first section the 3rd optical fiber 8, G 1iBe the gain of first channel and i interchannel, P i(t-z/u) transmitted the luminous power after the distance z for surveying light at first section the 3rd optical fiber 8, e is natural logarithm, λ 1Be the centre wavelength of pump signal light, M is 1≤M≤2 for the span of protecting parital coefficient and M, and A is the effective active area of first section the 3rd optical fiber 8, and k is constant and gets k=2.0 * 10 -3Km -1W -1/ cm -1, v 1For the frequency of light wave of pump signal light and
Figure BDA00002820556600091
C is the light velocity and c=3 * 10 8M/s, Be first channel wave number and
Figure BDA00002820556600094
Be the i channel wave number and
Figure BDA00002820556600095
Figure BDA00002820556600096
Be between the continuous probe light wavelength of the pump signal light wavelength of first channel and i channel frequency displacement and
Figure BDA00002820556600097
Span be 400cm -1～450cm -1,
Figure BDA00002820556600098
Be the average photon frequency in the pump signal light of first channel, P 1(t-z/u) transmitted the luminous power after the distance z for pump signal light at first section the 3rd optical fiber 8, L is the effective interaction length of first section the 3rd optical fiber 8, and i is the number of channel, and N is total number of channels and is integer; In the present embodiment, the frequency displacement between the pump signal light wavelength of first channel and the continuous probe light wavelength of the 2nd channel
Figure BDA00002820556600099
Value be 400cm -1, the frequency displacement between the pump signal light wavelength of first channel and the continuous probe light wavelength of the 3rd channel
Figure BDA000028205566000910
Value be 402.9cm -1, the frequency displacement between the pump signal light wavelength of first channel and the continuous probe light wavelength of the 4th channel
Figure BDA000028205566000911
Value be 406.2cm -1, the frequency displacement between the pump signal light wavelength of first channel and the continuous probe light wavelength of the 5th channel
Figure BDA000028205566000912
Value be 409.6cm -1, such frequency displacement value can access higher Raman gain, makes the wavelength conversion be easy to take place; The value of described N is 5, and the value of described L is 500m, and the value of described α is 0.2dB/km, and the value of described A is 5.5 * 10 -11m 2, the value of described M is 1, the value of described u is 2.0 * 10 8M/s.Because " 1 " of the pump signal light of transmission sign indicating number has very high-power on first section the 3rd optical fiber 8, met or exceeded the threshold value of stimulated Raman scattering effect, with a plurality of continuous probe light effects, and " 0 " of pump signal light sign indicating number is very not little with a plurality of continuous probe light actions or effect, so just the information transparency that carries on the pump signal light has been transformed on a plurality of continuous probe light, the energy of pump signal light has passed to a plurality of continuous probe light because stimulated Raman scattering amplifies with part energy; Carry out the luminous power synoptic diagram of wavelength conversion back pump signal light as shown in Figure 4, among Fig. 4, horizontal ordinate is represented time t, and unit is psec ps; Ordinate is represented luminous power P, and unit is watt W; Compare with the luminous power of Fig. 2 pump signal light, sign indicating number power reduction in its " 1 " is to about the 2.3W, and " 0 " sign indicating number does not change, and this is because the stimulated Raman scattering effect, and its " 1 " sign indicating number has passed to a plurality of continuous probe light with part energy, and " 0 " sign indicating number does not act on;
Step 6,9 pairs of described first channel-splitting filters carry information on the pump signal light and a plurality of continuous probe light of mixing are separated, a plurality of detection light after the output wavelength conversion, and the luminous power of a plurality of described detection light has nothing in common with each other; Carry out the luminous power synoptic diagram of wavelength conversion back first continuous probe light shown in Fig. 5 a, carry out the luminous power synoptic diagram of wavelength conversion back first continuous probe light shown in Fig. 5 b, carry out the luminous power synoptic diagram of wavelength conversion back first continuous probe light shown in Fig. 5 c, carry out the luminous power synoptic diagram of wavelength conversion back first continuous probe light shown in Fig. 5 d, among Fig. 5 a～6d, horizontal ordinate is all represented time t, and unit is psec p s; Ordinate is all represented luminous power P, and unit is watt W; Fig. 5 a carries out the luminous power of wavelength conversion back first continuous probe light and compares with the luminous power that Fig. 3 a first surveys first continuous probe light of light laser 3 outputs, and it has carried the information identical with flashlight, and " 1 " sign indicating number power has become 0.95 * 10 -5W, " 0 " sign indicating number power has become 0.1 * 10 -5W; Fig. 5 b carries out the luminous power of wavelength conversion back first continuous probe light and compares with the luminous power that Fig. 3 b second surveys second continuous probe light of light laser 3 outputs, and it has carried the information identical with flashlight, and " 1 " sign indicating number power has become 0.98 * 10 -5W, " 0 " sign indicating number power has become 0.1 * 10 -5W; Fig. 5 c carries out the luminous power of wavelength conversion back the 3rd continuous probe light and compares with the luminous power that Fig. 3 c the 3rd surveys the 3rd continuous probe light of light laser 3 outputs, and it has carried the information identical with flashlight, and " 1 " sign indicating number power has become 1.02 * 10 -5W, " 0 " sign indicating number power has become 0.1 * 10 -5W; Fig. 5 d carries out the luminous power of wavelength conversion back the 4th continuous probe light and compares with the luminous power that Fig. 3 d the 4th surveys the 4th continuous probe light of light laser 3 outputs, and it has carried the information identical with flashlight, and " 1 " sign indicating number power has become 1.07 * 10 -5W, " 0 " sign indicating number power has become 0.1 * 10 -5W;
Step 7, selection centre wavelength are the continuous pump laser 4 of λ P, and pump laser 4 is exported continuous pump lights and is transferred to second wave multiplexer 11 through the 5th optical fiber 12 continuously; For example select central wavelength lambda PThe continuous pump laser 4 of=1436.2nm, the luminous power synoptic diagram of the continuous pump light of pump laser 4 outputs is as shown in Figure 6 continuously; Among Fig. 6, horizontal ordinate is represented time t, and unit is psec ps; Ordinate is represented luminous power P, and unit is watt W; " 1 " sign indicating number power is 5W;
Step 8, by second wave multiplexer 11 a plurality of detection optically-coupled that described continuous pump light and described the 4th optical fiber 10 of Duo Gen of the 5th optical fiber 12 transmission transmits respectively are input in second section the 3rd optical fiber 13;
Step 9, second section the 3rd optical fiber 13 are according to formula
[kP p(0)L+k′P p′(0)L′]=0
And carry out gain compensation by the stimulated Raman scattering amplification process, and the luminous power of a plurality of described detection light is regulated, make the luminous power of a plurality of described detection light equate and be transferred to second channel-splitting filter 14; Wherein, k is that first section the 3rd optical fiber 8 frequency swing is 400cm -1～450cm -1Interior raman gain efficiency fitting a straight line slope and value are 2.0 * 10 -3Km -1W -1/ cm -1, k ' is that second section the 3rd optical fiber 13 frequency swing is 490cm -1～540cm -1Interior raman gain efficiency fitting a straight line slope and value are-8.2 * 10 -3Km -1w -1/ cm -1, e is natural logarithm, P p(0) is the peak power of described pump signal light in first section the 3rd optical fiber 8, P p' (0) is the peak power of described continuous pump light in second section the 3rd optical fiber 13, and L is the effective interaction length of first section the 3rd optical fiber 8, and L ' is the effective interaction length of second section the 3rd optical fiber 13; In the present embodiment, the value of described L is 500m, and the value of described L ' is 121m; Since with first section the 3rd optical fiber, 8 congener second section the 3rd optical fiber 13 in added the centre wavelength continuous pump light different with pump signal light, change to continuous pump laser 4 wavelength makes frequency swing obtain change, make second section the 3rd optical fiber 13 reach the Raman gain coefficienct tendency opposite with first section the 3rd optical fiber 8, the Raman gain coefficienct of first section the 3rd optical fiber 8 increases with the increase of frequency displacement, the Raman gain coefficienct of second section the 3rd optical fiber 13 reduces with the increase of frequency displacement, make that using first's frequency swing to make carries out the wavelength conversion in first section the 3rd optical fiber 8, in second section the 3rd optical fiber 13, use the second portion frequency swing to make and finally reach equal effect by the compensating action that carries out amplifying power.
The detection light that step 10,14 pairs of a plurality of luminous powers that mix of described second channel-splitting filter equate separates, the detection light that a plurality of luminous powers after the output gain compensation equate.Carry out the luminous power synoptic diagram of first continuous probe light behind the gain compensation shown in Fig. 7 a, carry out the luminous power synoptic diagram of first continuous probe light behind the gain compensation shown in Fig. 7 b, carry out the luminous power synoptic diagram of first continuous probe light behind the gain compensation shown in Fig. 7 c, carry out the luminous power synoptic diagram of first continuous probe light behind the gain compensation shown in Fig. 7 d, among Fig. 7 a～8d, horizontal ordinate is all represented time t, and unit is psec p s; Ordinate is all represented luminous power P, and unit is watt W; From Fig. 7 a～8d as can be seen, through the luminous power of first continuous probe light behind the gain compensation, through the luminous power of second continuous probe light behind the gain compensation, equate all that through the luminous power of the 3rd continuous probe light behind the gain compensation with through the luminous power of the 4th continuous probe light behind the gain compensation " 1 " sign indicating number power is 1.21 * 10 -5W, " 0 " sign indicating number power is 0.13 * 10 -5W.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; every any simple modification, change and equivalent structure of above embodiment being done according to the utility model technical spirit changes, and all still belongs in the protection domain of technical solutions of the utility model.

Claims (4)

1.一种增益平坦的拉曼光纤波长转换耦合器，其特征在于：包括用于输出信号光的信号光发生器（1）、用于对信号光发生器（1）输出的信号光进行放大形成泵浦信号光的掺铒光纤放大器（2）、用于输出多个连续探测光的多个探测光激光器（3）和用于输出连续泵浦光的连续泵浦激光器（4），以及用于对所述泵浦信号光和多个连续探测光进行耦合的第一合波器（5），所述信号光发生器（1）的输出端通过第一光纤（6）与所述掺铒光纤放大器（2）的输入端连接，所述掺铒光纤放大器（2）的输出端通过第一光纤（6）与所述第一合波器（5）的输入端连接，多个所述探测光激光器（3）的输出端分别对应通过多根第二光纤（7）与所述第一合波器（5）的输入端相接，所述第一合波器（5）的输出端通过用于通过受激拉曼散射放大过程来进行波长转换的第一段第三光纤（8）连接有用于输出波长转换后的多个探测光的第一分波器（9），所述第一分波器（9）的输出端通过多根第四光纤（10）连接有用于对所述连续泵浦光和波长转换后的多个探测光进行耦合并输出功率各不相等的信号光的第二合波器（11），所述连续泵浦激光器（4）通过第五光纤（12）与所述第二合波器（11）的输入端相接，所述第二合波器（11）的输出端通过用于对所述第二合波器（11）输出的功率各不相等的信号光进行增益补偿的第二段第三光纤（13）连接有用于输出光功率值相等的转换信号光的第二分波器（14），多个所述探测光激光器（3）的中心波长各不相同且多个所述探测光激光器（3）中任意一个的中心波长λi均大于所述信号光发生器（1）的中心波长λ1和所述连续泵浦激光器（4）的中心波长λP，且
Figure FDA00002820556500011
的取值范围为400cm-1～450cm-1，
Figure FDA00002820556500012
的取值范围为490cm-1～540cm-1，其中，i为信道数且i的取值为2～N，N为信道总数且为整数。1. A Raman fiber wavelength conversion coupler with flat gain, characterized in that: it includes a signal light generator (1) for outputting signal light, and is used to amplify the signal light output by the signal light generator (1) An erbium-doped fiber amplifier (2) for forming pump signal light, a plurality of probe light lasers (3) for outputting a plurality of continuous probe lights and a continuous pump laser (4) for outputting continuous pump light, and For the first multiplexer (5) for coupling the pumping signal light and a plurality of continuous detection lights, the output end of the signal light generator (1) is connected with the erbium-doped light through the first optical fiber (6) The input end of the fiber amplifier (2) is connected, the output end of the erbium-doped fiber amplifier (2) is connected to the input end of the first multiplexer (5) through the first optical fiber (6), and a plurality of the detection The output ends of the optical laser (3) are respectively connected to the input ends of the first multiplexer (5) through a plurality of second optical fibers (7), and the output ends of the first multiplexer (5) pass through The first segment of the third optical fiber (8) used for wavelength conversion through the stimulated Raman scattering amplification process is connected with a first wave splitter (9) for outputting a plurality of wavelength-converted probe lights, the first The output end of the wave splitter (9) is connected to the fourth optical fiber (10) through a plurality of fourth optical fibers (10), which are used to couple the continuous pump light and the multiple probe lights after wavelength conversion and output signal lights with different powers. Two multiplexers (11), the continuous pump laser (4) is connected to the input end of the second multiplexer (11) through the fifth optical fiber (12), and the second multiplexer (11) ) is connected to a converter for equal output optical power values through the second section of the third optical fiber (13) used for gain compensation for signal lights with unequal powers output by the second multiplexer (11) The second wave splitter (14) for the signal light, the central wavelengths of the multiple probe lasers (3) are different and the central wavelength λ i of any one of the multiple probe lasers (3) is greater than the The central wavelength λ 1 of the signal light generator (1) and the central wavelength λ P of the continuous pump laser (4), and
Figure FDA00002820556500011
The value range of is 400cm -1 ~ 450cm -1 ,
Figure FDA00002820556500012
The value range of is from 490cm -1 to 540cm -1 , wherein, i is the number of channels and the value of i is 2 to N, and N is the total number of channels and is an integer. 2.按照权利要求1所述的增益平坦的拉曼光纤波长转换耦合器，其特征在于：所述信号光发生器（1）由依次电连接的脉冲激光器（1-1）、伪随机序列发生器（1-2）和马增调制器（1-3）构成。2. The Raman fiber wavelength conversion coupler with flat gain according to claim 1, characterized in that: the signal light generator (1) is generated by sequentially electrically connected pulse lasers (1-1), pseudo-random sequence device (1-2) and horse gain modulator (1-3). 3.按照权利要求1所述的增益平坦的拉曼光纤波长转换耦合器，其特征在于：所述第一段第三光纤（8）和第二段第三光纤（13）均为高非线性光纤，所述高非线性光纤在1370nm～1700nm的波长范围内非线性系数范围为10W-1km-1～37W-1km-1，所述高非线性光纤在波长1550nｍ处的非线性系数为36.2W-1km-1，所述高非线性光纤在1370nm～1700nm的波长范围内色散值范围为0～0.6ps/(nm·km)，所述高非线性光纤在1370nm～1700nm的波长范围内色散斜率范围为-0.2～0.2。3. The Raman fiber wavelength conversion coupler with flat gain according to claim 1, characterized in that: the first section of the third optical fiber (8) and the second section of the third optical fiber (13) are both highly nonlinear Optical fiber, the non-linear coefficient range of the high nonlinear optical fiber in the wavelength range of 1370nm to 1700nm is 10W -1 km -1 ~ 37W -1 km -1 , the nonlinear coefficient of the high nonlinear optical fiber at the wavelength of 1550nm is 36.2W -1 km -1 , the dispersion value range of the highly nonlinear optical fiber in the wavelength range of 1370nm to 1700nm is 0 to 0.6ps/(nm·km), and the highly nonlinear optical fiber in the wavelength range of 1370nm to 1700nm The internal dispersion slope ranges from -0.2 to 0.2. 4.按照权利要求1所述的增益平坦的拉曼光纤波长转换耦合器，其特征在于：所述第一段第三光纤（8）的有效作用长度L与所述第二段第三光纤（13）的有效作用长度L′满足计算公式：[kPp(0)L+k′Pp′(0)L′]=0，其中，k为第一段第三光纤（8）频移范围为400cm-1～450cm-1内的拉曼增益效率拟合直线斜率且取值为2.0×10-3km-1·w-1/cm-1，k'为第二段第三光纤（13）频移范围为490cm-1～540cm-1内的拉曼增益效率拟合直线斜率且取值为-8.2×10-3km-1w-1/cm-1，Pp(0)为所述泵浦信号光在第一段第三光纤（8）中的峰值功率，Pp′(0)为所述连续泵浦光在第二段第三光纤（13）中的峰值功率。4. The Raman fiber wavelength conversion coupler with flat gain according to claim 1, characterized in that: the effective length L of the first section of the third optical fiber (8) is the same as the effective length L of the second section of the third optical fiber ( 13) The effective effective length L′ satisfies the calculation formula: [kP p (0)L+k′P p ′(0)L′]=0, where k is the frequency shift range of the first section of the third optical fiber (8) The slope of the straight line is fitted for the Raman gain efficiency within 400cm -1 ~ 450cm -1 and the value is 2.0×10 -3 km -1 ·w -1 /cm -1 , k' is the second section of the third optical fiber (13 ) with a frequency shift range of 490cm -1 to 540cm -1 and the slope of the Raman gain efficiency fitting line is -8.2×10 -3 km -1 w -1 /cm -1 , P p (0) is the The peak power of the pump signal light in the first section of the third optical fiber (8), P p '(0) is the peak power of the continuous pumping light in the second section of the third optical fiber (13).
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103091934A (en) * 2013-02-05 2013-05-08 西安邮电大学 Gain flattening Raman fiber wavelength conversion coupler and method
CN103716093A (en) * 2014-01-07 2014-04-09 西安邮电大学 Gain spectrum flat Raman fiber amplifier based on tellurium-based optical fibers
CN103731214A (en) * 2014-01-07 2014-04-16 西安邮电大学 As-S optical fiber Raman amplifier with flat gains

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103091934A (en) * 2013-02-05 2013-05-08 西安邮电大学 Gain flattening Raman fiber wavelength conversion coupler and method
CN103091934B (en) * 2013-02-05 2015-02-11 西安邮电大学 Gain flattening Raman fiber wavelength conversion coupler and method
CN103716093A (en) * 2014-01-07 2014-04-09 西安邮电大学 Gain spectrum flat Raman fiber amplifier based on tellurium-based optical fibers
CN103731214A (en) * 2014-01-07 2014-04-16 西安邮电大学 As-S optical fiber Raman amplifier with flat gains

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