CN102841480A - All-optical wavelength converter based on photonic crystal optical fiber four-wave frequency mixing effect - Google Patents
All-optical wavelength converter based on photonic crystal optical fiber four-wave frequency mixing effect Download PDFInfo
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- CN102841480A CN102841480A CN2011101671476A CN201110167147A CN102841480A CN 102841480 A CN102841480 A CN 102841480A CN 2011101671476 A CN2011101671476 A CN 2011101671476A CN 201110167147 A CN201110167147 A CN 201110167147A CN 102841480 A CN102841480 A CN 102841480A
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Abstract
The invention provides an all-optical wavelength converter based on a photonic crystal optical fiber four-wave frequency mixing effect. The all-optical wavelength converter comprises a laser, an optical crystal optical fiber and an optical filter, wherein the laser is a long pulse laser or a continuous laser with a pulse width more than tens of picoseconds, and the laser is used for outputting a pump light and providing a converting wavelength; the photonic crystal optical fiber is used for receiving and transmitting an output light of the laser; a laser beam can generate a degenerated four-wave frequency mixing effect during being transmitted in the photonic crystal optical fiber; and the laser beam output from the photonic crystal optical fiber passes through a narrow-band optical filter with a central wavelength of lambda and a proper bandwidth, thus, the laser beam with the wavelength of lambda can be obtained. According to the all-optical wavelength converter, one laser is adopted to synchronously provide the pump source and the converting wavelength, so that the all-optical wavelength converter has the advantages of simple structure, low cost and the like; and moreover, structural parameters of the photonic crystal optical fiber are designed, so that wavelength converting within a larger range can be achieved.
Description
Technical field
The present invention relates to a kind of AOWC, be specifically related to a kind of AOWC, be used to change the wavelength and the laser beam that produces specific wavelength of incoming laser beam based on the photonic crystal fiber four-wave mixing effect.
Background technology
AOWC is the important devices that realizes all-optical network.Carry out the utilization factor that wavelength Conversion can improve the optical-fiber network medium wavelength through this device, increase network more flexible and extensibility, reduce the blocking rate of network.AOWC is to utilize the nonlinear effect of some media that the light signal of input is directly transferred on the new wavelength.According to the difference of principle of work, AOWC can be divided into two big types: based on the wavelength shifter of optical modulation principle with based on the wavelength shifter of optical mixing principle.Only be applicable to the signal of intensity modulated based on the wavelength shifter of optical modulation principle,, can not realize the transparent of strictness so can only reach the limited transparency.Based on the wavelength shifter of optical mixing principle, mainly be the four-wave mixing effect that utilizes in the nonlinear optics.When a branch of or a few Shu Jiguang transmits in nonlinear medium, satisfy under the condition of phase matching four-wave mixing effect will take place.The four-wave mixing effect that identical pump light produces is called the four-wave mixing effect of degeneracy, and the four-wave mixing effect that the different pumping effect produces is called non-degenerate four-wave mixing effect.The result of mixing effect is the laser beam that has produced new frequency; Its phase place of laser beam and the frequency of new frequency are the linear combination of incident laser; Therefore the wavelength shifter based on the optical mixing principle can keep original phase place and amplitude information, and very transparent wavelength Conversion is provided.
One Chinese patent application number is 200410066256.9 a kind of " based on the AOWC of laser instrument four-wave mixing effect " to be provided, and adopts circulator with angular frequency to do
ω sFlashlight be injected into operation wavelength and do
ω pThe active medium of fiber-optical grating external cavity semiconductor laser in, utilizing four-wave mixing effect to produce angular frequency is 2
ω p-
ω sIdeler frequency light, realize wavelength Conversion.
Summary of the invention
Technical matters to be solved by this invention is: to the situation of above-mentioned prior art and the problem of existence; And a kind of AOWC based on the photonic crystal fiber four-wave mixing effect is provided, by a laser instrument pumping source and Wavelength-converting are provided simultaneously, therefore; This AOWC has advantages such as simple in structure, with low cost; In addition, through the structural parameters of design photonic crystal fiber, this AOWC can be realized wavelength Conversion in a big way.
The technical scheme that the present invention adopts is: this AOWC based on the photonic crystal fiber four-wave mixing effect; Form by laser instrument, photonic crystal fiber and optical filter; Laser instrument is long-pulse laser or the continuous wave laser of output pulse width more than tens picosecond magnitudes; The output pump light provides Wavelength-converting simultaneously; Photonic crystal fiber receives and transmits the output light of above-mentioned laser instrument, produces the four-wave mixing effect of degeneracy when laser beam is transmitted in photonic crystal fiber; From the laser beam of photonic crystal fiber output, be the narrow band optical filter of λ and appropriate bandwidth through centre wavelength, can obtain the laser beam that wavelength is λ.
In the technique scheme, the structural parameters of design photonic crystal fiber, the parameter wavelength that four-wave mixing effect is produced is the λ laser beam for the wavelength that will change generation.
In the technique scheme, the structural parameters of said photonic crystal fiber comprise the size and the space distance of airport; The parameter wavelength that said four-wave mixing effect produces is flashlight or idle light.
In the technique scheme; It is the laser beam of λ that said four-wave mixing effect conversion produces wavelength; The design process of photonic crystals optical fiber structure parameter is following: at first; Employing is calculated the propagation constant of guided mode in the reference light photonic crystal fiber based on the CUDOS software of multipole method or based on the COMSOL software of finite element method
β, and then can calculate pump wavelength
pEach rank abbe number at place
β m Then with abbe number
β m The phase-matching condition of substitution degeneration four-wave mixing effect
[1]:
Ω in the formula
s=
ω s-
ω pBe the flashlight frequency
ω sWith respect to pump light
ω pFrequency displacement,
γBe the nonlinear factor of optical fiber,
P 0Peak power for pumping pulse; Whether flashlight that numerical solution equation (1) check produces or idle light are the laser beam λ that needs conversion to produce; If not the laser beam λ that will produce, combine photonic crystal fiber adjustable dispersion characteristics flexibly so, its structural parameters of adjustment on the basis of reference optical fiber are till obtaining to produce the photonic crystals optical fiber structure parameter that wavelength is the λ laser beam.
The present invention is based on the AOWC of photonic crystal fiber degeneration four-wave mixing effect; With compare based on the AOWC of laser instrument four-wave mixing effect; Its advantage comprises: first; This AOWC only needs a laser instrument; Pumping source and Wavelength-converting are provided simultaneously, need not to provide in addition signal optical source, therefore; This AOWC structure is simpler, and cost reduces greatly; Second; Compare with other active media; Photonic crystal fiber is as the four-wave mixing medium; Not only have and respond fast, conversion code check advantages of higher; And with respect to common silica fibre, nonlinear factor is big, and wavelength conversion efficiency is high; Short photonic crystal fiber just can reach long non-linear effect apart from the ordinary optic fibre accumulation, is easy to realize the integrated of device; The 3rd, because the flexible adjustable dispersion characteristics of photonic crystal fiber, this AOWC can be realized wider wavelength conversion by the structural parameters of design photonic crystal fiber.In view of these advantages, this AOWC has broad application prospects in the fields such as design and fabrication of communications, optoelectronics, laser instrument.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the field scan Electronic Speculum figure of the photonic crystal fiber xsect that adopts in the instance.
Fig. 3 is the calculating dispersion curve of the photonic crystal fiber xsect that adopts in the instance.
Fig. 4 is the spectrogram of photonic crystal fiber output from instance, and flashlight is near 747nm, and idle light is near 1848nm.
Fig. 5 is constant for the ratio that keeps photonic crystal fiber airport diameter and pitch of holes, the change curve that its zero dispersion point reduces with pitch of holes.
Fig. 6 is for keeping the constant pitch of holes that reduces of ratio of photonic crystal fiber airport diameter and pitch of holes, and the parameter wavelength that four-wave mixing effect produces is with the change curve of deviation between pumping wavelength and the zero dispersion point.
Embodiment
Below in conjunction with accompanying drawing and instantiation the present invention is further described, accompanying drawing only is used for the example purpose, rather than limits usable range of the present invention.
Fig. 1 is a kind of AOWC structural representation based on the photonic crystal fiber four-wave mixing effect provided by the invention, is made up of laser instrument 1, photonic crystal fiber 2 and optical filter 3.As specific embodiment; The Nd:YAG that laser instrument selects for use Teem Phononics company to produce transfers Q microwafer laser instrument; The operation wavelength of this laser instrument is 1064nm; Pulse width is 0.6ns, and the peak power when repetition frequency is 7.2kHz is 15kW, and the average power of laser instrument space output is about 65mW.It is pointed out that and also can select other operation wavelengths, pulsewidth long pulse or the continuous light laser instrument more than tens picosecond magnitudes.The structural parameters of photonic crystal fiber are designed by the laser beam wavelength that will change generation, and the while is selected the optical filter of suitable wavelength and bandwidth based on the centre wavelength that will change the generation laser beam and spectrum width.
Fig. 2, Fig. 3 are the field scan Electronic Speculum figure of the photonic crystal fiber xsect that adopts in the instance and the dispersion curve of calculating.This optical fiber is by the long airport diameter d=3.54 μ m of company's production, the photonic crystal fiber of pitch of holes Λ=5.42 μ m of flying.According to the structural parameters of this optical fiber, adopt propagation constant based on this optical fiber guided mode of CUDOS computed in software of multipole method
βThereby, can calculate each rank abbe number at pumping wavelength 1064nm place
β m , can also make this CHROMATIC DISPERSION IN FIBER OPTICS curve, as shown in Figure 3, and marked the zero dispersion point in the drawings near 1117nm.
Fig. 4 is the output spectrum of the accent Q microwafer laser pumping photonic crystal fiber shown in Figure 2 that recorded by spectrometer Agilent86142B.Adopt 25 to show the speck mirror output optically-coupled of laser instrument is advanced in the 1m photonic crystal fiber, adopt intercept method to record the power that pumping advances optical fiber and be approximately 35mW, coupling efficiency is approximately 53.8%.Can be seen that by Fig. 4 output spectrum flashlight appears near the 747nm, idle light is near 1848nm.Is the narrow band pass filter of 12nm with output spectrum through centre wavelength 748nm, the bandwidth that company of Daheng produces; The power that records 747nm light is 3.12mW; Because the peak transmittance of this narrow band pass filter is 50%; The power of the 747nm light that therefore produces in the experiment is approximately 6.24mW, and promptly the pump light of 1064nm is 18% to the transformation efficiency of 747nm flashlight, like this we just can to obtain wavelength be the laser beam of 747nm.
Because photonic crystal fiber has adjustable dispersion characteristics flexibly; Therefore can be through changing the airport diameter and the pitch of holes of photonic crystal fiber; And then change its each rank abbe number, by phase-matching condition (1), can realize conversion to other wavelength laser bundles.As embodiment, on the basis of photonic crystal fiber shown in Figure 2, keep the ratio of airport and pitch of holes constant, pitch of holes is reduced to 3.5 μ m gradually by 5.42 μ m, this process can realize through the post-processing technology of photonic crystal fiber
[2]Calculate the propagation constant of guided mode in each optical fiber structure then successively, and then can calculate their each rank abbe number and dispersion curve, result of calculation shows that the zero dispersion point of photonic crystal fiber is reduced to 1012nm by 1117nm, and is as shown in Figure 5; At last with each rank abbe number substitution phase-matching condition (1) of each optical fiber structure; Produce the parameter wavelength (flashlight and idle light wavelength) of four-wave mixing effect in each structured optical fiber of numerical solution, as shown in Figure 6, wherein; Blue small circle representation signal optical wavelength; Scope can be from 747nm to 1013nm, and red small circle is represented the idle light wavelength, and scope can be from 1848nm to 1120nm.This just means the structural parameters of this AOWC through the design photonic crystal fiber, can be the laser beam of 1064nm with pumping wavelength, converts interval [747 1013] nm and the interior laser beam that produces any wavelength of [1,120 1848] nm into.Need to prove: only be to be example with pumping wavelength 1064nm here, if adopt the pumping source of different wave length, this AOWC can be realized wider wavelength Conversion.
The AOWC that the present invention proposes based on the photonic crystal fiber four-wave mixing effect; Compare with above-mentioned AOWC based on the laser instrument four-wave mixing effect; It only needs a laser instrument; Pumping source and Wavelength-converting are provided simultaneously, and because the flexible adjustable dispersion characteristics of photonic crystal fiber, the scope of this AOWC Wavelength-converting is wideer.Compare with other active media in addition; Photonic crystal fiber is as the four-wave mixing medium; Have not only that response is fast, conversion code check advantages of higher, and with respect to common silica fibre, nonlinear factor is big; Wavelength conversion efficiency is high, and short photonic crystal fiber just can reach long non-linear effect apart from the ordinary optic fibre accumulation.The more important thing is that the advantage that adopts shorter photonic crystal fiber to produce four-wave mixing effect also comprises: can reduce ambient temperature and change influence to the optical fiber zero dispersion point; Reduce stimulated Brillouin scattering, the caused spectrum widening of stimulated Raman scattering; Can also effectively avoid the interpulse walk-off effect of different wave length.
Claims (4)
1. AOWC based on the photonic crystal fiber four-wave mixing effect; It is characterized in that: form by laser instrument, photonic crystal fiber and optical filter; Laser instrument is long-pulse laser or the continuous wave laser of output pulse width more than tens picosecond magnitudes; The output pump light provides Wavelength-converting simultaneously; Photonic crystal fiber receives and transmits the output light of above-mentioned laser instrument, produces the four-wave mixing effect of degeneracy when laser beam is transmitted in photonic crystal fiber; From the laser beam of photonic crystal fiber output, be the narrow band optical filter of λ and appropriate bandwidth through centre wavelength, can obtain the laser beam that wavelength is λ.
2. the AOWC based on the photonic crystal fiber four-wave mixing effect according to claim 1; It is characterized in that: the structural parameters of design photonic crystal fiber, the parameter wavelength that four-wave mixing effect is produced is the λ laser beam for the wavelength that will change generation.
3. the AOWC based on the photonic crystal fiber four-wave mixing effect according to claim 1 is characterized in that: the structural parameters of said photonic crystal fiber comprise the size and the space distance of airport; The parameter wavelength that said four-wave mixing effect produces is flashlight or idle light.
4. the AOWC based on the photonic crystal fiber four-wave mixing effect according to claim 1; It is characterized in that: it is the laser beam of λ that said four-wave mixing effect conversion produces wavelength; The design process of photonic crystals optical fiber structure parameter is following: at first; Employing is calculated the propagation constant of guided mode in the reference light photonic crystal fiber based on the CUDOS software of multipole method or based on the COMSOL software of finite element method
β, and then can calculate pump wavelength
pEach rank abbe number at place
β m Then with abbe number
β m The phase-matching condition of substitution degeneration four-wave mixing effect
[1]:
Ω in the formula
s=
ω s-
ω pBe the flashlight frequency
ω sWith respect to pump light
ω pFrequency displacement,
γBe the nonlinear factor of optical fiber,
P 0Peak power for pumping pulse; Whether flashlight that numerical solution equation (1) check produces or idle light are the laser beam λ that needs conversion to produce; If not the laser beam λ that will produce, combine photonic crystal fiber adjustable dispersion characteristics flexibly so, its structural parameters of adjustment on the basis of reference optical fiber are till obtaining to produce the photonic crystals optical fiber structure parameter that wavelength is the λ laser beam.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103124044A (en) * | 2013-01-30 | 2013-05-29 | 中国人民解放军国防科学技术大学 | Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser |
| CN103825657A (en) * | 2014-03-20 | 2014-05-28 | 北京邮电大学 | Multi-channel signal multicasting method based on four-wave mixing theory |
| CN103901700A (en) * | 2014-05-06 | 2014-07-02 | 天津大学 | Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method |
| CN104317138A (en) * | 2014-10-20 | 2015-01-28 | 浙江大学 | Ultra-wideband all-optical wavelength conversion method and device employing integrated planar waveguide |
| CN104751161A (en) * | 2015-04-03 | 2015-07-01 | 燕山大学 | Photonic crystal fiber property simulation system based on precise end face extraction and finite element method and simulation method thereof |
| CN111227797A (en) * | 2020-01-15 | 2020-06-05 | 电子科技大学 | Nonlinear effect enhanced sweep frequency light source |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124044A (en) * | 2013-01-30 | 2013-05-29 | 中国人民解放军国防科学技术大学 | Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser |
| CN103124044B (en) * | 2013-01-30 | 2015-04-08 | 中国人民解放军国防科学技术大学 | Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser |
| CN103825657A (en) * | 2014-03-20 | 2014-05-28 | 北京邮电大学 | Multi-channel signal multicasting method based on four-wave mixing theory |
| CN103901700A (en) * | 2014-05-06 | 2014-07-02 | 天津大学 | Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method |
| CN103901700B (en) * | 2014-05-06 | 2016-06-29 | 天津大学 | Wavelength tunable and frequency spectrum controllable small-sized Quantum Correlation photon pair source and the method for generation |
| CN104317138A (en) * | 2014-10-20 | 2015-01-28 | 浙江大学 | Ultra-wideband all-optical wavelength conversion method and device employing integrated planar waveguide |
| CN104751161A (en) * | 2015-04-03 | 2015-07-01 | 燕山大学 | Photonic crystal fiber property simulation system based on precise end face extraction and finite element method and simulation method thereof |
| CN111227797A (en) * | 2020-01-15 | 2020-06-05 | 电子科技大学 | Nonlinear effect enhanced sweep frequency light source |
| CN111227797B (en) * | 2020-01-15 | 2021-06-08 | 电子科技大学 | Nonlinear effect enhanced sweep frequency light source |
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Application publication date: 20121226 |