CN203069943U - Stimulated raman scattering based wavelength converter - Google Patents

Stimulated raman scattering based wavelength converter Download PDF

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CN203069943U
CN203069943U CN 201320066820 CN201320066820U CN203069943U CN 203069943 U CN203069943 U CN 203069943U CN 201320066820 CN201320066820 CN 201320066820 CN 201320066820 U CN201320066820 U CN 201320066820U CN 203069943 U CN203069943 U CN 203069943U
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wavelength
laser instrument
optical fiber
laser
raman scattering
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徐军华
赵云
李�瑞
李栋
冷斌
左旭
袁心易
侯雪梅
巩明辉
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Xian University of Posts and Telecommunications
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Abstract

The utility model discloses a stimulated raman scattering based wavelength converter, which comprises a first laser, a second laser, a combiner and an optical filter, wherein the first laser is connected with a modulator; the output end of the first laser is connected with an erbium-doped optical fiber amplifier through a first optical fiber; the output end of the erbium-doped optical fiber amplifier is connected with a first input end of the combiner through the first optical fiber; the output end of the second laser is connected with the second input end of the combiner through a second fiber; the output end of the combiner is connected with the optical filter through a third fiber which is used for wavelength conversion through amplification process of the stimulated raman scattering; the center wavelength of the second laser is larger than that of the first laser; and the center wavelength of the optical filter is equal to that of the second laser. The wavelength converter has the advantages of quick wavelength conversion rate, wide tuning bandwidth and strong practicability, and can perform transparent wavelength conversion and cross-wave band and tunable wavelength conversion.

Description

Wavelength shifter based on stimulated Raman scattering
Technical field
The utility model belongs to the optical communication technique field, is specifically related to a kind of wavelength shifter based on stimulated Raman scattering.
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 same 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.
And Tunable All-optical Wavelength Converter can realize the conversions between many group different wave lengths, and it mainly contains advantage in all optical network: (1) can more effective recycling wavelength, further improves the wavelength utilization rate.(2) can constitute dynamic wavelength route, be conducive to the raising of transfer rate.(3) can reduce the number that optical network node is placed wavelength shifter, be conducive to reduce system cost.
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, widespread use in optical fiber telecommunications system has ripe commercial product.But its shortcoming is the apparatus structure complexity, and cost increases power consumption height, poor reliability with speed and parts number, this is restricted its application in the multi-wavelength channel system, and do not possess transmission pattern and rate transparency, and 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 physical influence that present All Optical Wave Converter part mainly utilizes has: the cross-gain mudulation effect in the semiconductor optical amplifier (SOA), cross-phase modulation, four-wave mixing, gain saturation effect in the semiconductor laser, difference frequency, the four-wave mixing effect of nonlinear materials such as semiconductor material, lithium columbate crystal, optical fiber.But shortcomings such as all there is the implementation process complexity in it, and cost is higher, and slewing rate is slow, and wavelength to be converted is limited, and network node will arrange a plurality of wavelength shifters need carry out wavelength conversion to a plurality of wavelength channels the time simultaneously, and cost increases greatly.
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 wavelength shifter based on stimulated Raman scattering is provided, it is simple in structure, reasonable in design, realize that cost is low, the wavelength switching rate is fast, bandwidth is wide, can transparent wavelength change and the tunable wavelength conversion, 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 wavelength shifter based on stimulated Raman scattering, it is characterized in that: comprise for first laser instrument of output signal light with for second laser instrument of exporting continuous probe light, and be used for the wave multiplexer that the flashlight after amplifying and continuous probe light are coupled and be used for leaching the optical filter of the detection light after wavelength is changed, be electrically connected with on described first laser instrument for first laser instrument is exported the amplitude of light and the modulator that phase place is modulated, the output terminal of described first laser instrument is connected with for the flashlight to first laser instrument output by first optical fiber and carries out power amplification and form the Erbium-Doped Fiber Amplifier (EDFA) of pump signal light, the output terminal of described Erbium-Doped Fiber Amplifier (EDFA) is connected with the first input end of described wave multiplexer by first optical fiber, the output terminal of described second laser instrument is connected with second input end of described wave multiplexer by second optical fiber, the output terminal of described wave multiplexer is by being connected the central wavelength lambda of described second laser instrument for the 3rd optical fiber that carries out the wavelength conversion by the stimulated Raman scattering amplification process with optical filter iCentral wavelength lambda greater than described first laser instrument 1, the centre wavelength of described optical filter equals the central wavelength lambda of described second laser instrument i
The above-mentioned wavelength shifter based on stimulated Raman scattering is characterized in that: the central wavelength lambda of described second laser instrument iCentral wavelength lambda with described first laser instrument 1Satisfy frequency displacement computing formula Δ v=(1/ λ 1)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 200cm -1～500cm -1
The above-mentioned wavelength shifter based on stimulated Raman scattering is characterized in that: described the 3rd optical fiber is 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 above-mentioned wavelength shifter based on stimulated Raman scattering is characterized in that: described second laser instrument is tunable laser, and described optical filter is adjustable light wave-filter, and the tuning range of described second laser instrument is identical with the tuning range of described optical filter.
The utility model compared with prior art has the following advantages:
1, the utility model is simple in structure, and is reasonable in design, and 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 by regulating tunable laser, information translation that can flashlight is entrained can be finished the tunable wavelength conversion on different continuous probe light.
4, the utility model is in wavelength-conversion process, and the spontaneous emission noise of wavelength shifter is low, can realize the counter-rotating of warbling.
5, wavelength switching rate of the present utility model is fast, and wavelength conversion bandwidth is wide, 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 enlargement factor can realize controlled by regulating pumping light power, fiber lengths etc.
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, realizes that cost is low, wavelength switching rate height, tuning bandwidth is wide, can realize the transparent wavelength conversion, stride the conversion of wave band wavelength and tunable wavelength conversion, 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 pump signal light.
Fig. 3 is the luminous power synoptic diagram of the continuous probe light of the utility model second laser instrument output.
Fig. 4 is the luminous power synoptic diagram that carries out wavelength conversion back pump signal light.
Fig. 5 carries out the luminous power synoptic diagram that light is surveyed in wavelength conversion back.
Description of reference numerals:
1-modulator; 2-the first laser instrument; 3-Erbium-Doped Fiber Amplifier (EDFA);
4-the second laser instrument; 5-wave multiplexer; 6-the three optical fiber;
7-optical filter; 8-the first optical fiber; 9-the second optical fiber.
Embodiment
As shown in Figure 1, the utility model comprises for first laser instrument 2 of output signal light with for second laser instrument 4 of exporting continuous probe light, and be used for the wave multiplexer 5 that the flashlight after amplifying and continuous probe light are coupled and be used for leaching the optical filter 7 of the detection light after wavelength is changed, be electrically connected with on described first laser instrument 2 for first laser instrument 2 is exported the amplitude of light and the modulator 1 that phase place is modulated, the output terminal of described first laser instrument 2 is connected with for the flashlight to the output of first laser instrument 2 by first optical fiber 8 and carries out power amplification and form the Erbium-Doped Fiber Amplifier (EDFA) 3 of pump signal light, the output terminal of described Erbium-Doped Fiber Amplifier (EDFA) 3 is connected with the first input end of described wave multiplexer 5 by first optical fiber 8, the output terminal of described second laser instrument 4 is connected with second input end of described wave multiplexer 5 by second optical fiber 9, the output terminal of described wave multiplexer 5 is by being connected the central wavelength lambda of described second laser instrument 4 for the 3rd optical fiber 6 that carries out the wavelength conversion by the stimulated Raman scattering amplification process with optical filter 7 iCentral wavelength lambda greater than described first laser instrument 2 1, the centre wavelength of described optical filter 7 equals the central wavelength lambda of described second laser instrument 4 i
In the present embodiment, the central wavelength lambda of described second laser instrument 4 iCentral wavelength lambda with described first laser instrument 2 1Satisfy frequency displacement computing formula Δ v=(1/ λ 1)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount and Δ v is 200cm -1～500cm -1, in this frequency swing, can access higher Raman gain, make the wavelength conversion be easy to take place, the tunable whole-optical wavelength conversion in the same communication wave band can not only be realized, and the communication band All Optical Wavelength Conversion can be realized striding.
In the present embodiment, described the 3rd optical fiber 6 is 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, described second laser instrument 4 is tunable laser, and described optical filter 7 is adjustable light wave-filter, and the tuning range of described second laser instrument 4 is identical with the tuning range of described optical filter 7; By regulating tunable laser, information translation that can flashlight is entrained is on different continuous probe light, can finish tunable wavelength conversion, because the continuous and wide 40THz that reaches of raman gain spectrum of the 3rd optical fiber 6, therefore effectively tuning range is also very wide and can reach 50nm.
Adopt the wavelength shifter based on stimulated Raman scattering described in the utility model to carry out the method for wavelength conversion, may further comprise the steps:
Step 1, at first to select centre wavelength be λ 1 First laser instrument 2, modulate by amplitude and the phase place of 1 pair of modulator, first laser instrument, 2 output light then, make first laser instrument, 2 output signal light and be transferred to Erbium-Doped Fiber Amplifier (EDFA) 3 through first optical fiber 8; In the present embodiment, select central wavelength lambda 1 First laser instrument 2 of=1550nm;
Step 2, the flashlight of exporting by 3 pairs of first laser instruments 2 of Erbium-Doped Fiber Amplifier (EDFA) 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 wave multiplexer 5 by first optical fiber 8; 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 p s; Ordinate is represented luminous power P, and unit is watt W; " 1 " sign indicating number power is 0.5W;
Step 3, according to frequency displacement computing formula Δ v=(1/ λ 1)-(1/ λ i) selection centre wavelength is λ iSecond laser instrument, 4, the second laser instruments 4 output continuous probe light and be transferred to wave multiplexer 5 through second optical fiber 9; Wherein, Δ v is that the span of frequency shift amount and Δ v is 200cm -1～500cm -1The i.e. central wavelength lambda of second laser instrument 4 iSpan be 1599.6nm～1680.2nm; In the present embodiment, get Δ v=440cm -1, Raman gain coefficienct is obtained maximum under this frequency displacement, and it is optimum that the wavelength conversion effect reaches, the central wavelength lambda of second laser instrument of then selecting 4 i=1663.5nm, the luminous power synoptic diagram of the continuous probe light of second laser instrument, 4 outputs is as shown in Figure 3; Among Fig. 3, horizontal ordinate is represented time t, and unit is psec p s; Ordinate is represented luminous power P, and unit is watt W; The luminous power of the continuous probe light of second laser instrument, 4 outputs is constant value 1 * 10 -6W;
Step 4, by wave multiplexer 5 the described pump signal light of first optical fiber 8 transmission and the continuous probe optically-coupled of second optical fiber, 9 transmission are input in the 3rd optical fiber 6;
Step 5, the 3rd optical fiber 6 are according to formula
Figure BDA00002820563500061
And carry out wavelength conversion by the stimulated Raman scattering amplification process, with information translation entrained on the pump signal light on continuous probe light and be transferred to optical filter 7; Wherein, P 1iWhen transmitting in the 3rd optical fiber 6 for continuous probe light and the luminous power of pump signal light after interacting, α is the attenuation coefficient of luminous power in the 3rd optical fiber 6, and z is the distance that light transmits in the 3rd optical fiber 6, and t is the used time of transmission range z, u is the group velocity of light in the 3rd optical fiber 6, 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 the 3rd optical fiber 6, 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 the 3rd optical fiber 6, and k is constant and gets k=1.80 * 10 -16Mcm/w, v 1For the frequency of light wave of pump signal light and
Figure BDA00002820563500071
C is the light velocity and value c=3 * 10 8M/s,
Figure BDA00002820563500072
Be first channel wave number and
Figure BDA00002820563500074
Be the i channel wave number and
Figure BDA00002820563500075
Be between the continuous probe light wavelength of the pump signal light wavelength of first channel and i channel frequency displacement and
Figure BDA00002820563500077
Span be 0～500cm -1,
Figure BDA00002820563500078
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 the 3rd optical fiber 6, L is the effective interaction length of the 3rd optical fiber 6, and i is the number of channel, and N is total number of channels and is integer; In the present embodiment, described
Figure BDA00002820563500079
Value be 440cm -1, the value of described L is 10km, and the value of described α is 0.2dB/km, and the value of described A is 5.0 * 10 -11m 2, the value of described M is 2, 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 the 3rd optical fiber 6, met or exceeded the threshold value of stimulated Raman scattering effect, with the continuous probe light effect, and " 0 " of pump signal light sign indicating number is very not little with continuous probe light action or effect, so just the information transparency that carries on the pump signal light has been transformed on the continuous probe light, the energy of pump signal light has passed to 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 p s; 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 0.32W, and " 0 " sign indicating number does not change, and this is because the stimulated Raman scattering effect, its " 1 " sign indicating number has passed to continuous probe light with part energy, and " 0 " sign indicating number does not act on or acts on very little;
Step 6, leach detection light after the wavelength conversion by optical filter 7; The detection light that obtains has so also carried the entrained information of flashlight, has finished the wavelength conversion.Carry out the luminous power synoptic diagram of wavelength conversion back detection light as shown in Figure 5, among Fig. 5, 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 the continuous probe light of Fig. 3 second laser instrument 4 output, it has carried the information identical with flashlight, and " 1 " sign indicating number power has become 7 * 10 -6W, " 0 " sign indicating number is constant.
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. wavelength shifter based on stimulated Raman scattering, it is characterized in that: comprise for first laser instrument (2) of output signal light with for second laser instrument (4) of exporting continuous probe light, and be used for the wave multiplexer (5) that the flashlight after amplifying and continuous probe light are coupled and be used for leaching the optical filter (7) of the detection light after wavelength is changed, be electrically connected with on described first laser instrument (2) for first laser instrument (2) is exported the amplitude of light and the modulator (1) that phase place is modulated, the output terminal of described first laser instrument (2) is connected with for the flashlight to first laser instrument (2) output by first optical fiber (8) and carries out power amplification and form the Erbium-Doped Fiber Amplifier (EDFA) (3) of pump signal light, the output terminal of described Erbium-Doped Fiber Amplifier (EDFA) (3) is connected with the first input end of described wave multiplexer (5) by first optical fiber (8), the output terminal of described second laser instrument (4) is connected with second input end of described wave multiplexer (5) by second optical fiber (9), the output terminal of described wave multiplexer (5) is by being connected the central wavelength lambda of described second laser instrument (4) for the 3rd optical fiber (6) that carries out the wavelength conversion by the stimulated Raman scattering amplification process with optical filter (7) iCentral wavelength lambda greater than described first laser instrument (2) 1, the centre wavelength of described optical filter (7) equals the central wavelength lambda of described second laser instrument (4) i
2. according to the described wavelength shifter based on stimulated Raman scattering of claim 1, it is characterized in that: the central wavelength lambda of described second laser instrument (4) iCentral wavelength lambda with described first laser instrument (2) 1Satisfy frequency displacement computing formula Δ v=(1/ λ 1)-(1/ λ i), wherein, Δ v is that the span of frequency shift amount Δ v is 200cm -1～500cm -1
3. according to the described wavelength shifter based on stimulated Raman scattering of claim 1, it is characterized in that: described the 3rd optical fiber (6) is 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.
4. according to the described wavelength shifter based on stimulated Raman scattering of claim 1, it is characterized in that: described second laser instrument (4) is tunable laser, described optical filter (7) is adjustable light wave-filter, and the tuning range of described second laser instrument (4) is identical with the tuning range of described optical filter (7).
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103166101A (en) * 2013-02-05 2013-06-19 西安邮电大学 Wave length converter based on stimulated raman scattering and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103166101A (en) * 2013-02-05 2013-06-19 西安邮电大学 Wave length converter based on stimulated raman scattering and method

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