CN103022880A - Device and method for adjusting spectral width of super-continuum spectrum - Google Patents
Device and method for adjusting spectral width of super-continuum spectrum Download PDFInfo
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- CN103022880A CN103022880A CN2012105499248A CN201210549924A CN103022880A CN 103022880 A CN103022880 A CN 103022880A CN 2012105499248 A CN2012105499248 A CN 2012105499248A CN 201210549924 A CN201210549924 A CN 201210549924A CN 103022880 A CN103022880 A CN 103022880A
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Abstract
The invention provides a device and a method for adjusting spectral width of super-continuum spectrum. The device comprises a laser device, photonic crystal fiber and a temperature controller, wherein the laser device is used for providing pump light to the photonic crystal fiber; the photonic crystal fiber is used for receiving the pump light through an input end and outputting the super-continuum spectrum from an output end after nonlinearly converting the pump light; and the temperature controller uses temperature to change nonlinearity and dispersion characteristics of the photonic crystal fiber so as to adjust the spectral width of the super-continuum spectrum. According to the device and the method for adjusting the spectral width of the super-continuum spectrum, dynamic adjustment of the spectral width of the super-continuum spectrum generated by the photonic crystal fiber is achieved, and application flexibility is improved.
Description
Technical field
The embodiment of the invention relates to the optical communication technique field, relates in particular to a kind of super continuous spectrums spectral width adjusting device and method.
Background technology
Super continuous spectrums refers to after the great laser of a beam intensity passes through nonlinear material, produces many new frequency contents in the outgoing spectrum, and spectral width is far longer than the width of incident light spectrum, generally can reach hundreds of nanometer even thousands of nanometer.The super continuous spectrums that utilizes photonic crystal fiber to produce has high power output, smooth broadband spectral, the characteristics such as spatial coherence of height, can improve greatly signal to noise ratio, reduce Measuring Time and widen spectral measurement ranges, therefore, super continuous spectrums can be used as following high speed wavelength division multiplexing and time division multiplexing light source, can also be applied in the fields such as the chromatic dispersion measurement of full photo reversal, optical fiber of the conversion of light carrier radio communication, wavelength, wavelength division multiplexed light net and optical sampling.Because concrete applied environment is different, therefore, spectral width to super continuous spectrums requires also to be not quite similar, but in the prior art, in the constant situation of incident light and photonic crystal fiber, utilize the spectral width of the super continuous spectrums that photonic crystal fiber produces can not dynamic change, therefore have in actual applications certain limitation.
Summary of the invention
For the defects of prior art, the embodiment of the invention provides a kind of super continuous spectrums spectral width adjusting device and method.
The embodiment of the invention provides a kind of super continuous spectrums spectral width adjusting device on the one hand, comprising:
Laser, photonic crystal fiber and temperature controller;
Described laser is used for providing pump light to described photonic crystal fiber;
Described photonic crystal fiber is used for receiving described pump light by input, and described pump light is carried out exporting super continuous spectrums from output after the non-linear conversion;
Described temperature controller is used for non-linear and dispersion characteristics by the described photonic crystal fiber of temperature change to adjust the spectral width of described super continuous spectrums.
The super continuous spectrums spectral width method of adjustment that the embodiment of the invention provides a kind of super continuous spectrums spectral width adjusting device of using the embodiment of the invention and providing to carry out on the other hand comprises:
Described laser provides pump light to described photonic crystal fiber;
Described photonic crystal fiber receives described pump light by input, and described pump light is carried out exporting super continuous spectrums from output after the non-linear conversion;
Non-linear and the dispersion characteristics of described temperature controller by the described photonic crystal fiber of temperature change are to adjust the spectral width of described super continuous spectrums.
Super continuous spectrums spectral width adjusting device and method that the embodiment of the invention provides, the pump light that photonic crystal fiber provides laser carries out in the process of non-linear conversion output super continuous spectrums, change the temperature of photonic crystal fiber by the application of temperature controller, and then changed the refractive index of micropore size, spacing and the quartz material of photonic crystal fiber, so that complicated the change occurs for the dispersion of photonic crystal fiber and nonlinear characteristic, thereby so that utilize the spectral width of the super continuous spectrums of photonic crystal fiber generation to change.Realized that the spectral width of super continuous spectrums that photonic crystal fiber is produced dynamically adjusts, improved the flexibility of using.
Description of drawings
Fig. 1 is the structural representation of an embodiment of super continuous spectrums spectral width adjusting device of the present invention;
Fig. 2 is the flow chart of the super continuous spectrums spectral width method of adjustment embodiment one that carries out of application super continuous spectrums spectral width adjusting device shown in Figure 1;
Fig. 3 is the structural representation of another embodiment of super continuous spectrums spectral width adjusting device of the present invention;
Fig. 4 is the flow chart of the super continuous spectrums spectral width method of adjustment embodiment two that carries out of application super continuous spectrums spectral width adjusting device shown in Figure 3;
Fig. 5 is the structural representation of the another embodiment of super continuous spectrums spectral width adjusting device of the present invention;
Fig. 6 is the flow chart of the super continuous spectrums spectral width method of adjustment embodiment three that carries out of application super continuous spectrums spectral width adjusting device shown in Figure 5.
Embodiment
Fig. 1 is the structural representation of an embodiment of super continuous spectrums spectral width adjusting device of the present invention, as shown in Figure 1, this device comprises: laser 1, photonic crystal fiber 2 and temperature controller 3, need to prove, in actual applications, photonic crystal fiber 2 can be disconnected from each other with the position relationship of temperature controller 3, photonic crystal fiber 2 is positioned among the temperature controller 3, and the input of photonic crystal fiber 2 and output are positioned at (as shown in Figure 1) outside the temperature controller 3, as long as can utilize temperature controller 3 to change the temperature of photonic crystal fiber 2, particular location relation between the two is not limited to this.Wherein, laser 1 is used for providing pump light to photonic crystal fiber 2; Photonic crystal fiber 2 is used for receiving pump light by input, and pump light is carried out exporting super continuous spectrums from output after the non-linear conversion; Temperature controller 3 is used for non-linear and dispersion characteristics by temperature change photonic crystal fiber 2 with the spectral width of adjustment super continuous spectrums.
Particularly, Fig. 2 is the flow chart of the super continuous spectrums spectral width method of adjustment embodiment one that carries out of application super continuous spectrums spectral width adjusting device shown in Figure 1, and as shown in Figure 2, the method specifically comprises:
Step 100, laser provides pump light to photonic crystal fiber;
Laser sends the strong illumination laser medium and finishes population inversion, thereby provides pump light to photonic crystal fiber.Need to prove, it will be appreciated by persons skilled in the art that the type of laser comprises: semiconductor laser, fiber laser and solid state laser etc., can select according to the application needs of reality.
Step 101, photonic crystal fiber receives described pump light by input, and described pump light is carried out exporting super continuous spectrums from output after the non-linear conversion;
Photonic crystal fiber receives the pump light of laser emission by input, when pump light passes through nonlinear dielectric, because after the nonlinear effect effects such as phase-modulation, Cross-phase Modulation, four wave mixing, and then from photonic crystal fiber output output super continuous spectrums.What one of ordinary skill in the art will appreciate that is, the principle of photonic crystal fiber output super continuous spectrums is specially: pump light is by the anomalous dispersion region of photonic crystal fiber, utilize the Higher order soliton compression effect to make the burst spectrum broadening, pulse narrowing this moment, peak power strengthen and video stretching, then superpower burst pulse enters the normal dispersion district through the zero dispersion point, strong from the accumulation of warbling of phase-modulation and normal dispersion interaction induction frequency, so that compose further broadening.
Step 102, the temperature controller non-linear and dispersion characteristics by the temperature change photonic crystal fiber are to adjust the spectral width of described super continuous spectrums.
The pump light that photonic crystal fiber provides laser carries out in the process of non-linear conversion output super continuous spectrums, change the temperature of photonic crystal fiber by the application of temperature controller, and then changed the refractive index of micropore size, spacing and the quartz material of photonic crystal fiber, so that complicated the change occurs for the dispersion of photonic crystal fiber and nonlinear characteristic, thereby so that utilize the spectral width of the super continuous spectrums of photonic crystal fiber generation to change.
Super continuous spectrums spectral width adjusting device and method that the present embodiment provides, the pump light that photonic crystal fiber provides laser carries out in the process of non-linear conversion output super continuous spectrums, change the temperature of photonic crystal fiber by the application of temperature controller, and then changed the refractive index of micropore size, spacing and the quartz material of photonic crystal fiber, so that complicated the change occurs for the dispersion of photonic crystal fiber and nonlinear characteristic, thereby so that utilize the spectral width of the super continuous spectrums of photonic crystal fiber generation to change.Realized that the spectral width of super continuous spectrums that photonic crystal fiber is produced dynamically adjusts, improved the flexibility of using.
Particularly, temperature controller 3 specifically is used for: the temperature of rising photonic crystal fiber 2 perhaps, reduces the temperature of photonic crystal fiber 2 to dwindle the spectral width of super continuous spectrums with the spectral width of broadening super continuous spectrums.Because the type of laser comprises in above-described embodiment: semiconductor laser, fiber laser and solid state laser etc., wherein, the specific implementation form of temperature controller much comprises: heater, refrigerator, roaster or liquid nitrogen container etc.
Type for the laser in above-described embodiment comprises: semiconductor laser, fiber laser and solid state laser etc., dissimilar laser and the annexation of photonic crystal fiber are not quite similar, below by the implementation procedure of Fig. 3 to detailed description fiber laser embodiment illustrated in fig. 6 and solid state laser, specific as follows:
Fig. 3 is the structural representation of another embodiment of super continuous spectrums spectral width adjusting device of the present invention, as shown in Figure 3, the present embodiment is by heating up to photonic crystal fiber, utilize the spectral width of the super continuous spectrums of fiber laser and photonic crystal fiber generation with change, this device comprises: fiber laser 4, photonic crystal fiber 2 and heater 5, wherein, the direct welding of the input of the tail optical fiber of fiber laser 4 and photonic crystal fiber 2, photonic crystal fiber 2 is positioned among the heater 5, and the input of photonic crystal fiber 2 and output are positioned at outside the heater 5; Wherein, fiber laser 4 is used for directly providing pump light to the input of photonic crystal fiber 2 by tail optical fiber; Photonic crystal fiber 2 is used for receiving pump light by input, and pump light is carried out exporting super continuous spectrums from output after the non-linear conversion; Heater 5 is used for the temperature of rising photonic crystal fiber 2 with the spectral width of broadening super continuous spectrums.
Fig. 4 is the flow chart of the super continuous spectrums spectral width method of adjustment embodiment two that carries out of application super continuous spectrums spectral width adjusting device shown in Figure 3, and as shown in Figure 4, the method specifically comprises:
Step 200, fiber laser directly provides pump light to the input of photonic crystal fiber by tail optical fiber;
Photonic crystal fiber receives the pump light of laser emission by input, when pump light passes through nonlinear dielectric, because after the nonlinear effect effects such as phase-modulation, Cross-phase Modulation, four wave mixing, and then from photonic crystal fiber output output super continuous spectrums.What one of ordinary skill in the art will appreciate that is, the principle of photonic crystal fiber output super continuous spectrums is specially: pump light is by the anomalous dispersion region of photonic crystal fiber, utilize the Higher order soliton compression effect to make the burst spectrum broadening, pulse narrowing this moment, peak power strengthen and video stretching, then superpower burst pulse enters the normal dispersion district through the zero dispersion point, strong from the accumulation of warbling of phase-modulation and normal dispersion interaction induction frequency, so that compose further broadening.
Step 202, the temperature of heater rising photonic crystal fiber is with the spectral width of the described super continuous spectrums of broadening.
The pump light that photonic crystal fiber provides fiber laser carries out in the process of non-linear conversion output super continuous spectrums, temperature by application of heat device rising photonic crystal fiber, because the micropore of thermal enlargement effect photonic crystal optical fiber size and spacing may change, in addition, the refractive index of quartz material also can be because thermo-optic effect changes, thereby so that utilizes the spectral width of the super continuous spectrums that photonic crystal fiber produces to broaden.
Super continuous spectrums spectral width adjusting device and method that the present embodiment provides, the pump light that photonic crystal fiber provides fiber laser carries out in the non-linear process of transferring out super continuous spectrums, temperature by application of heat device rising photonic crystal fiber, and then changed the refractive index of micropore size, spacing and the quartz material of photonic crystal fiber, so that complicated the change occurs for the dispersion of photonic crystal fiber and nonlinear characteristic, thereby so that utilize the spectral width of the super continuous spectrums of photonic crystal fiber generation to broaden.Realized that the spectral width of super continuous spectrums that photonic crystal fiber is produced dynamically adjusts, improved the flexibility of using.
Fig. 5 is the structural representation of the another embodiment of super continuous spectrums spectral width adjusting device of the present invention, as shown in Figure 5, the present embodiment is by lowering the temperature to photonic crystal fiber, utilize the spectral width of the super continuous spectrums of solid state laser and photonic crystal fiber generation with change, this device comprises: solid state laser 6, condenser lens 7, photonic crystal fiber 2 and liquid nitrogen container 8, wherein, the input of photonic crystal fiber 2 is positioned at the focus place of condenser lens 7, photonic crystal fiber 2 is positioned among the liquid nitrogen container 8, and the input of photonic crystal fiber 2 and output are positioned at outside the liquid nitrogen container 8; Wherein, solid state laser 6 is used for by condenser lens 7 pump light being coupled into the input of photonic crystal fiber 2; Photonic crystal fiber 2 is used for receiving pump light by input, and pump light is carried out exporting super continuous spectrums from output after the non-linear conversion; Liquid nitrogen container 8 for reducing the temperature of photonic crystal fiber 2 to dwindle the spectral width of super continuous spectrums.
Fig. 6 is the flow chart of the super continuous spectrums spectral width method of adjustment embodiment three that carries out of application super continuous spectrums spectral width adjusting device shown in Figure 5, and as shown in Figure 6, the method specifically comprises:
Photonic crystal fiber receives the pump light of laser emission by input, when pump light passes through nonlinear dielectric, because after the nonlinear effect effects such as phase-modulation, Cross-phase Modulation, four wave mixing, and then from photonic crystal fiber output output super continuous spectrums.What one of ordinary skill in the art will appreciate that is, the principle of photonic crystal fiber output super continuous spectrums is specially: pump light is by the anomalous dispersion region of photonic crystal fiber, utilize the Higher order soliton compression effect to make the burst spectrum broadening, pulse narrowing this moment, peak power strengthen and video stretching, then superpower burst pulse enters the normal dispersion district through the zero dispersion point, strong from the accumulation of warbling of phase-modulation and normal dispersion interaction induction frequency, so that compose further broadening.
Step 302, liquid nitrogen container reduce the temperature of photonic crystal fiber to dwindle the spectral width of described super continuous spectrums.
The pump light that photonic crystal fiber provides fiber laser carries out in the process of non-linear conversion output super continuous spectrums, reduce the temperature of photonic crystal fiber by using liquid nitrogen container, and then the gas in the photonic crystal fiber micropore then can condense into liquid, thereby the micropore of photonic crystal fiber size and spacing may change, and the refraction index profile that affects photonic crystal fiber, thereby so that utilize the spectral width of the super continuous spectrums of photonic crystal fiber generation to reduce, need to prove, to reduce be the adjustment of carrying out according to the practical application needs to spectral width herein, compares still broadening greatly with the spectral width of incident light.
Super continuous spectrums spectral width adjusting device and method that the present embodiment provides, the pump light that photonic crystal fiber provides solid state laser carries out in the process of non-linear conversion output super continuous spectrums, reduce the temperature of photonic crystal fiber by using liquid nitrogen container, and then changed the refractive index of micropore size, spacing and the quartz material of photonic crystal fiber, so that complicated the change occurs for the dispersion of photonic crystal fiber and nonlinear characteristic, thereby so that utilize the spectral width of the super continuous spectrums of photonic crystal fiber generation to narrow down.Realized that the spectral width of super continuous spectrums that photonic crystal fiber is produced dynamically adjusts, improved the flexibility of using.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a super continuous spectrums spectral width adjusting device is characterized in that, comprising:
Laser, photonic crystal fiber and temperature controller;
Described laser is used for providing pump light to described photonic crystal fiber;
Described photonic crystal fiber is used for receiving described pump light by input, and described pump light is carried out exporting super continuous spectrums from output after the non-linear conversion;
Described temperature controller is used for non-linear and dispersion characteristics by the described photonic crystal fiber of temperature change to adjust the spectral width of described super continuous spectrums.
2. super continuous spectrums spectral width adjusting device according to claim 1 is characterized in that,
Described laser is specially fiber laser, the tail optical fiber of described fiber laser and the direct welding of the input of described photonic crystal fiber.
3. super continuous spectrums spectral width adjusting device according to claim 1, it is characterized in that, described control device also comprises: condenser lens, and described laser is specially solid state laser, and the input of described photonic crystal fiber is positioned at the focus place of described condenser lens.
4. super continuous spectrums spectral width adjusting device according to claim 1 is characterized in that,
Described temperature controller specifically is used for: the temperature of the described photonic crystal fiber that raises perhaps, reduces the temperature of described photonic crystal fiber to dwindle the spectral width of described super continuous spectrums with the spectral width of the described super continuous spectrums of broadening.
5. arbitrary described super continuous spectrums spectral width adjusting device is characterized in that according to claim 1-4,
Described photonic crystal fiber is positioned among the described temperature controller, and the input of described photonic crystal fiber and output are positioned at outside the described temperature controller.
6. super continuous spectrums spectral width adjusting device according to claim 5 is characterized in that,
Described temperature controller comprises: heater or liquid nitrogen container.
7. use the super continuous spectrums spectral width method of adjustment that super continuous spectrums spectral width adjusting device as claimed in claim 1 carries out for one kind, it is characterized in that, comprising:
Described laser provides pump light to described photonic crystal fiber;
Described photonic crystal fiber receives described pump light by input, and described pump light is carried out exporting super continuous spectrums from output after the non-linear conversion;
Non-linear and the dispersion characteristics of described temperature controller by the described photonic crystal fiber of temperature change are to adjust the spectral width of described super continuous spectrums.
8. super continuous spectrums spectral width method of adjustment according to claim 7 is characterized in that, described laser is specially fiber laser, the tail optical fiber of described fiber laser and the direct welding of the input of described photonic crystal fiber;
Described laser provides pump light to comprise to described photonic crystal fiber:
Described fiber laser directly provides pump light to the input of described photonic crystal fiber by tail optical fiber.
9. super continuous spectrums spectral width method of adjustment according to claim 7, it is characterized in that, described control device also comprises: condenser lens, and described laser is specially solid state laser, and the input of described photonic crystal fiber is positioned at the focus place of described condenser lens;
Described laser provides pump light to comprise to described photonic crystal fiber:
Described solid state laser is coupled into pump light by described condenser lens the input of described photonic crystal fiber.
10. arbitrary described super continuous spectrums spectral width method of adjustment is characterized in that according to claim 7-9,
Described temperature controller specifically comprises with the spectral width of adjusting described super continuous spectrums by the non-linear and dispersion characteristics of the described photonic crystal fiber of temperature change:
Described temperature controller raises the temperature of described photonic crystal fiber with the spectral width of the described super continuous spectrums of broadening; Perhaps,
Described temperature controller reduces the temperature of described photonic crystal fiber to dwindle the spectral width of described super continuous spectrums.
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| CN108508677A (en) * | 2018-03-12 | 2018-09-07 | 中国人民解放军国防科技大学 | Supercontinuum frequency conversion laser based on PP L N crystal |
| US10969542B2 (en) | 2019-07-19 | 2021-04-06 | Asml Netherlands B.V. | Radiation source with temperature-controlled hollow fiber and a method for use in metrology applications |
| TWI747691B (en) * | 2020-01-15 | 2021-11-21 | 荷蘭商Ａｓｍｌ荷蘭公司 | Method, assembly, and apparatus for improved control of broadband radiation generation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108508677A (en) * | 2018-03-12 | 2018-09-07 | 中国人民解放军国防科技大学 | Supercontinuum frequency conversion laser based on PP L N crystal |
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| TWI747691B (en) * | 2020-01-15 | 2021-11-21 | 荷蘭商Ａｓｍｌ荷蘭公司 | Method, assembly, and apparatus for improved control of broadband radiation generation |
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Application publication date: 20130403 |