CN102566194A - Broadband wavelength converter based on high-nonlinearity flattened-dispersion optical fibers and converting method of broadband wavelength converter - Google Patents
Broadband wavelength converter based on high-nonlinearity flattened-dispersion optical fibers and converting method of broadband wavelength converter Download PDFInfo
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- CN102566194A CN102566194A CN2012100388817A CN201210038881A CN102566194A CN 102566194 A CN102566194 A CN 102566194A CN 2012100388817 A CN2012100388817 A CN 2012100388817A CN 201210038881 A CN201210038881 A CN 201210038881A CN 102566194 A CN102566194 A CN 102566194A
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Abstract
The invention relates to a broadband wavelength converter based on high-nonlinearity flattened-dispersion optical fibers, which comprises a signal light input optical path, a continuous light source, a continuous light input optical path and a Sagnac interference ring. The Sagnac interference ring comprises high-nonlinearity flattened-dispersion optical fibers, a first coupler and a second coupler, wherein the first coupler is used for transmitting continuous light to the Sagnac interference ring, and the second coupler is used for coupling signal light to be converted with the continuous light outputted by the first coupler and transmitting to the Sagnac interference ring. The invention further relates to a converting method of the broadband wavelength converter, which includes: using the second coupler to receive the signal lights to be converted; using the first coupler to receive the continuous light in a target conversion wavelength; and using the first coupler to output wavelength-converted signal light and the original-wavelength signal light. The broadband wavelength converter and the converting method have the advantages that wavelength conversion with wavelength interval more than 50nm can be realized; the converter is quick in response speed and can reach femtosecond level theoretically; the length of the Sagnac interference ring is only 10m; and the broadband wavelength converter is compact in structure, cost-saving and low in power consumption.
Description
Technical field
The present invention relates to full light signal processing technology field and nonlinear optical fiber optical technical field, particularly a kind of broad band wavelength transducer and transform method based on the high non-linearity Dispersion Flattened Fiber.
Background technology
Infotech rapidly develops with the speed out of people's imagination, and people promote the increasing demand of communication quality and Experience Degree simultaneously, therefore, the communication technology are had higher requirement.Full light intelligence restructural communication network is acknowledged as the next generation communication mode that solves communication performance bottleneck.In full light intelligence restructural communication network, in order to make full use of Internet resources, need carry out dynamic adjustments to resource, with the obstruction of reduction network, and then the reconfigurability of raising optical-fiber network and intelligent.The technology that realizes all optical wavelength conversion at present mainly contains cross-gain modulation (XGM), cross-phase modulation (XPM) and four-wave mixing (FWM) etc.The cross-gain modulation is the gain saturation effect in the active device, and semiconductor optical amplifier (SOA) is the device of most widely used generation cross-gain modulation.But because the restriction of charge carrier release time among the SOA, the response speed of this type optical wavelength converter is generally at nanosecond order, and this will limit the further lifting of all optical wavelength conversion speed.XPM and FWM are two kinds of third-order non-linear effects, have the response speed of femtosecond magnitude, are that the ideal of super high speed all-optical wavelength conversion is selected, and obtain showing great attention to of various countries scientific worker.The fibre core of optical fiber is very little; Make that its third-order non-linear coefficient is very big, and light signal is when propagating in optical fiber, both operating distance is long; Thereby can realize XPM or FWM effect well; In addition, have natural compatibility, can reduce to insert to maximum constraints loss based on the optical wavelength converter and the optical communication system of optical fiber.
Find through the document retrieval; Sarker; B. wait the people at Photonics Technology Letters (photon technology wall bulletin; 2002; Vol.14 has delivered the paper that is entitled as " All-optical wavelength conversion based on cross-phase modulation (XPM) in a single-mode fiber and a Mach-Zehnderinterferometer. (based on the optical wavelength converter of cross-phase modulation in single-mode fiber and the Mach-Zehnder interferometer) " on pp.340-342), and the optical wavelength converter of reporting in the literary composition is made up of a 2km long standard single-mode fiber and a Mach-Zehnder interferometer.Because the nonlinear factor of standard single-mode fiber is less, and reasons such as chromatic dispersion unevenness make that the wavelength conversion efficient of this structure is not high, the width of wavelength conversion has only 20nm, is difficult to be fit to the needs of broad band full conversion.
Find through patent retrieval that again application number is 200480025229.5, name is called " AOWC of based semiconductor image intensifer with Sagnac interferometer of asymmetric position ".This device uses Sarnia gram (Sagnac) interferometric loop, and on the asymmetric position of loop, places SOA, utilizes SOA and Sagnac loop to accomplish the wavelength Conversion of input signal jointly.As before said; The operating rate of SOA is limited by the release time of charge carrier; Therefore the operating rate of this device has only nanosecond order, and the placement of SOA needs a side-play amount accurately in this device, and inappropriate side-play amount can make conversion effect not reach designing requirement.
Therefore, existing optical wavelength converter all need improve on disposable wavelength width and conversion rate, to meet the demands.
Summary of the invention
The technical matters that the present invention will solve is: in order to overcome the existing deficiency of optical wavelength converter on disposable wavelength width and conversion rate; The present invention provides a kind of broad band wavelength transducer and transform method based on the high non-linearity Dispersion Flattened Fiber; The present invention can realize that the wavelength interval is the above wavelength Conversion of 50nm; Conversion rate can reach the femtosecond magnitude in theory, observes the conversion rate of picosecond magnitude in an embodiment.
The technical solution adopted for the present invention to solve the technical problems is: a kind of broad band wavelength transducer based on the high non-linearity Dispersion Flattened Fiber; Has the continuous light input light path that is used to adjust flashlight input light path, the continuous light source of flashlight polarization state to be transformed and power and is used to adjust continuous light polarization state and power; Described continuous light source is connected with the continuous light input light path; Also has the Sagnac interference ring; Described Sagnac interference ring comprises the high non-linearity Dispersion Flattened Fiber, be used for continuous light is delivered to first coupling mechanism on the Sagnac interference ring and is used for the continuous light coupling of flashlight to be transformed and the output of first coupling mechanism and is delivered to second coupling mechanism on the Sagnac interference ring; Second coupling mechanism is arranged on the Sagnac interference ring between the high non-linearity Dispersion Flattened Fiber and first coupling mechanism; Described flashlight input light path is communicated by letter with second coupling mechanism, and the continuous light input light path is communicated by letter with first coupling mechanism.
In order to control the polarization state of light signal in the Sagnac interference ring, also have at least one the 3rd Polarization Controller on the described Sagnac interference ring, described the 3rd Polarization Controller and second coupling mechanism lay respectively at the both sides of high non-linearity Dispersion Flattened Fiber.
In order to control flashlight to be transformed and the continuous polarized state of light that is used for controlled target conversion wavelength, described flashlight input light path has at least one first Polarization Controller, has at least one second Polarization Controller in the continuous light input light path.
In order to adapt to the needs of broad band full wavelength conversion, improve the width of wavelength conversion, the nonlinear factor of described high non-linearity Dispersion Flattened Fiber>=11 (KmW)
-1, abbe number: 0≤GVD＜1.5ps/km/nm, length≤10m.
As preferably, described first coupling mechanism is that splitting ratio is 50: 50 four port luminous power coupling mechanisms, and first end is an input end, is connected with described continuous light source; Second end is the output terminal of flashlight after the conversion; The 3rd end and the 4th end are respectively first component output terminal and the second component output terminal that is used to export the second component signal that is used to export first component signal, and the 3rd end and the 4th end all communicate with the Sagnac interference ring; Described first component signal is opposite with the traffic direction of second component signal on the Sagnac interference ring.
As preferably, match with first coupling mechanism, described second coupling mechanism is that splitting ratio is 10: 90 three port luminous power coupling mechanisms, first end is 90% input end, is connected with the output terminal of flashlight input light path; Second end is 10% input end, is connected with the 3rd end or the 4th end of first coupling mechanism; The 3rd end is the output terminal that is used to export coupled signal, communicates with the high non-linearity Dispersion Flattened Fiber.
A kind of broad band wavelength transform method based on the high non-linearity Dispersion Flattened Fiber; The Sagnac interference ring is set; Described Sagnac interference ring comprises high non-linearity Dispersion Flattened Fiber, first coupling mechanism, second coupling mechanism and at least one Polarization Controller, and second coupling mechanism is arranged on the Sagnac interference ring between the high non-linearity Dispersion Flattened Fiber and first coupling mechanism;
The flashlight to be transformed that receives through polarization state and power adjustment gets into second coupling mechanism;
The continuous light that receives through polarization state and power adjustment gets into first coupling mechanism, and described continuous light wavelength is identical with the wavelength of object transformation, in the Sagnac interference ring, continuous light is divided into clockwise component and counterclockwise component;
Be input in the high non-linearity Dispersion Flattened Fiber after the flashlight coupling that the clockwise component of first coupling mechanism or counterclockwise component and second coupling mechanism receive, produce phase modulated signal;
Phase modulated signal and counterclockwise component or clockwise component arrive first coupling mechanism simultaneously, from first coupling mechanism output transform flashlight and the former wavelength signals light of wavelength.
In the conversion process, the adjustment Polarization Controller makes the output signal of Sagnac interference ring the strongest.
The signal of conversion in order to select, the conversion that will from first coupling mechanism, export the flashlight and the former wavelength signals light of wavelength be input to wave filter, the flashlight of wavelength that obtained conversion.
The invention has the beneficial effects as follows, the present invention is based on the broad band wavelength transducer and the transform method of high non-linearity Dispersion Flattened Fiber, have the following advantages:
1, have very wide wavelength conversion width, can be with signal transfer to being separated by on the wavelength more than the 50nm with signal light wavelength;
2, ultrafast response speed can reach the femtosecond magnitude in theory;
3, compact conformation is practiced thrift cost, compares with existing optical wavelength converter based on the Sagnac interference ring, and the ring length of existing Sagnac ring needs hundreds of rice to last km, and the ring length of Sagnac ring of the present invention has only 10m;
4, low in energy consumption, to compare with existing optical wavelength converter based on the Sagnac interference ring, power consumption of the present invention will be hanged down 3dB at least.
5, the high non-linearity Dispersion Flattened Fiber does not need special side-play amount, the convenient use, and the later stage is not subject to the offset of high non-linearity Dispersion Flattened Fiber and influences conversion effect.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the structural representation that the present invention is based on the optimum embodiment of broad band wavelength transducer of high non-linearity Dispersion Flattened Fiber.
Among the figure 1, Erbium-Doped Fiber Amplifier (EDFA) (EDFA), 2, first Polarization Controller, 3, the first optical power attenuation device, 4, tunable laser; 5, the 2nd EDFA, 6, second Polarization Controller, 7, the second optical power attenuation device, 8, second coupling mechanism; 9, first coupling mechanism, 10, the high non-linearity Dispersion Flattened Fiber, the 11, the 3rd Polarization Controller; 12, wave filter, 13, autocorrelation function analyzer, 14, spectroanalysis instrument.
Fig. 2 is the preceding spectrum of the optimum embodiment medium wavelength of broad band wavelength transducer conversion that the present invention is based on the high non-linearity Dispersion Flattened Fiber.
Fig. 3 is the spectrum that the present invention is based on after the optimum embodiment medium wavelength of the broad band wavelength transducer conversion of high non-linearity Dispersion Flattened Fiber.
Fig. 4 is the preceding signal pulse of the optimum embodiment medium wavelength of broad band wavelength transducer conversion that the present invention is based on the high non-linearity Dispersion Flattened Fiber.
Fig. 5 the present invention is based on the signal pulse of behind wavelength conversion, exporting among the optimum embodiment of broad band wavelength transducer of high non-linearity Dispersion Flattened Fiber.
Embodiment
Combine accompanying drawing that the present invention is done further detailed explanation now.These accompanying drawings are the synoptic diagram of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
As shown in Figure 1, the present invention is based on the structural representation of the optimum embodiment of broad band wavelength transducer of high non-linearity Dispersion Flattened Fiber.Has the continuous light input light path that is used to adjust flashlight input light path, the continuous light source of flashlight polarization state to be transformed and power and is used to adjust continuous light polarization state and power; The flashlight input light path has first Erbium-Doped Fiber Amplifier (EDFA) 1, first Polarization Controller 2 and the first optical power attenuation device 3 successively; Have second Erbium-Doped Fiber Amplifier (EDFA) 5, second Polarization Controller 6 and second optical attenuator 7 in the continuous light input light path successively; Continuous light source is a tunable laser 4; Tunable laser 4 is connected with second Erbium-Doped Fiber Amplifier (EDFA) 5; Also has the Sagnac interference ring; The Sagnac interference ring comprises high non-linearity Dispersion Flattened Fiber 10, be used for continuous light is delivered to first coupling mechanism 9 on the Sagnac interference ring and is used for the continuous light coupling of flashlight to be transformed and 9 outputs of first coupling mechanism and is delivered to second coupling mechanism 8 on the Sagnac interference ring; The high non-linearity Dispersion Flattened Fiber 10 and first coupling mechanism 9 are symmetrical set on the Sagnac interference ring; Second coupling mechanism 8 is arranged on the Sagnac interference ring between the high non-linearity Dispersion Flattened Fiber 10 and first coupling mechanism 9, and the first optical power attenuation device 3 is connected with second coupling mechanism 8, and second optical attenuator 7 is connected with first coupling mechanism 9.
Also have one the 3rd Polarization Controller, 11, the three Polarization Controllers 11 and second coupling mechanism 8 on the Sagnac interference ring and lay respectively at the both sides of high non-linearity Dispersion Flattened Fiber 10.
Second coupling mechanism 8 is that splitting ratio is 10: 90 three port luminous power coupling mechanisms, and first end 801 is 90% input end, is connected with the output terminal of the first optical power attenuation device 3; Second end 802 is 10% input end, is connected with the 4th end 904 of first coupling mechanism 9; The 3rd end 803 communicates with high non-linearity Dispersion Flattened Fiber 10 for being used to export the output terminal of coupled signal.The 3rd end 903 of first coupling mechanism 9 is connected with the 3rd Polarization Controller 11.
Pulse signal to be transformed amplifies through first Erbium-Doped Fiber Amplifier (EDFA) 1; Regulate its polarization state by first Polarization Controller 2 then; Make the output signal of flashlight input light path the strongest; Then signal light power is adjusted to 8dBm, by second coupling mechanism 8 90% signal power is coupled to 803 ports by its 801 port at last, enter into the Sagnac interference ring by the first optical power attenuation device 3.The target wavelength that the wavelength regulation of the continuous light of tunable laser 4 output need be transformed to flashlight; The wavelength of object transformation is 1510nm in the present embodiment; And by 5 amplifications of second Erbium-Doped Fiber Amplifier (EDFA); By its polarization states of second Polarization Controller 6 control, make the output signal of continuous light input light path the strongest again, then by second optical attenuator 7 with the continuous light power adjustments to 8dBm; Divide this continuous light equally 903 and 904 ports by its 901 port by first coupling mechanism 9 then, form clockwise and the two-way light that moves counterclockwise.904 ports of first coupling mechanism link to each other with 802 ports of second coupling mechanism.Had 10% power be coupled to 803 ports through 802 ports of second coupling by the light of 904 ports output, be input in the high non-linearity Dispersion Flattened Fiber 10 with the flashlight of being come by the coupling of 801 ports, flashlight and continuous light interact in high non-linearity Dispersion Flattened Fiber 10; Produce cross-phase modulation effect, thereby change the phase place of the continuous light of operation clockwise, carry the continuous light and the continuous light of operation counterclockwise of the clockwise operation of phase information; In first coupling 9, meet, at last that flashlight is entrained signal transfer is regulated the 3rd Polarization Controller 11 to continuous light; Make the output signal of 902 ports the strongest; And by the output of 902 ports of first coupling mechanism 9, output light is divided into two-way, and one the tunnel through wave filter; The flashlight of wavelength that leached conversion is input to autocorrelation function analyzer 13 again; Another road is directly inputted to spectroanalysis instrument 14.
The nonlinear factor of the high non-linearity Dispersion Flattened Fiber that is adopted in the present embodiment is 11 (KmW)
-1, abbe number: 0.5＜GVD＜1.5ps/km/nm, length is 10m.
Present embodiment transforms to 1510nm with flashlight by wavelength 1560nm; Transformation results such as Fig. 2-shown in Figure 5; Wherein, Fig. 2 and Fig. 3 have successfully realized the conversion of wavelength from frequency domain explanation, and Fig. 4 and Fig. 5 have explained the realization of wavelength conversion from time domain, and can find out that conversion rate reaches picosecond magnitude.Among Fig. 5, flashlight is behind wavelength conversion, and pulse is broadening to some extent, and those skilled in the art can know that this only is because the effect of wave filter; And, as can beappreciated from fig. 3, conversion the signal light power of wavelength stronger, can satisfy the requirement of communication.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the instructions, must confirm its technical scope according to the claim scope.
Claims (9)
1. broad band wavelength transducer based on the high non-linearity Dispersion Flattened Fiber; Has the continuous light input light path that is used to adjust flashlight input light path, the continuous light source of flashlight polarization state to be transformed and power and is used to adjust continuous light polarization state and power; Described continuous light source is connected with the continuous light input light path; It is characterized in that: also have the Sagnac interference ring; Described Sagnac interference ring comprises high non-linearity Dispersion Flattened Fiber (10), be used for continuous light is delivered to first coupling mechanism (9) on the Sagnac interference ring and is used for the continuous light coupling of flashlight to be transformed and first coupling mechanism (9) output and is delivered to second coupling mechanism (8) on the Sagnac interference ring; Second coupling mechanism (8) is arranged on the Sagnac interference ring between high non-linearity Dispersion Flattened Fiber (10) and first coupling mechanism (9); Described flashlight input light path is communicated by letter with second coupling mechanism (8), and the continuous light input light path is communicated by letter with first coupling mechanism (9).
2. the broad band wavelength transducer based on the high non-linearity Dispersion Flattened Fiber as claimed in claim 1; It is characterized in that: also have at least one the 3rd Polarization Controller (11) on the described Sagnac interference ring, described the 3rd Polarization Controller (11) and second coupling mechanism (8) lay respectively at the both sides of high non-linearity Dispersion Flattened Fiber (10).
3. the broad band wavelength transducer based on the high non-linearity Dispersion Flattened Fiber as claimed in claim 1; It is characterized in that: described flashlight input light path has at least one first Polarization Controller (2), has at least one second Polarization Controller (6) in the continuous light input light path.
4. the broad band wavelength transducer based on the high non-linearity Dispersion Flattened Fiber as claimed in claim 1 is characterized in that: nonlinear factor>=11 (KmW) of described high non-linearity Dispersion Flattened Fiber (10)
-1, abbe number: 0≤GVD＜1.5ps/km/nm, length≤10m.
5. like each described broad band wavelength transducer in the claim 1 to 4 based on the high non-linearity Dispersion Flattened Fiber; It is characterized in that: described first coupling mechanism (9) is that splitting ratio is the four port luminous power coupling mechanisms of 50:50; First end (901) is an input end, is connected with described continuous light source; Second end (902) is the output terminal of flashlight after the conversion; The 3rd end (903) and the 4th end (904) are respectively first component output terminal and the second component output terminal that is used to export the second component signal that is used to export first component signal, and the 3rd end (903) and the 4th end (904) all communicate with the Sagnac interference ring; Described first component signal is opposite with the traffic direction of second component signal on the Sagnac interference ring.
6. the broad band wavelength transducer based on the high non-linearity Dispersion Flattened Fiber as claimed in claim 5; It is characterized in that: described second coupling mechanism (8) is that splitting ratio is the three port luminous power coupling mechanisms of 10:90; First end (801) is 90% input end, is connected with the output terminal of flashlight input light path; Second end (802) is 10% input end, is connected with the 3rd end (903) or the 4th end (904) of first coupling mechanism (9); The 3rd end (803) communicates with high non-linearity Dispersion Flattened Fiber (10) for being used to export the output terminal of coupled signal.
7. broad band wavelength transform method based on the high non-linearity Dispersion Flattened Fiber is characterized in that:
The Sagnac interference ring is set; Described Sagnac interference ring comprises high non-linearity Dispersion Flattened Fiber (10), first coupling mechanism (9), second coupling mechanism (8) and at least one Polarization Controller (11), and second coupling mechanism (8) is arranged on the Sagnac interference ring between high non-linearity Dispersion Flattened Fiber (10) and first coupling mechanism (9);
The flashlight to be transformed that receives through polarization state and power adjustment gets into second coupling mechanism (8);
The continuous light that receives through polarization state and power adjustment gets into first coupling mechanism (9), and described continuous light wavelength is identical with the wavelength of object transformation, in the Sagnac interference ring, continuous light is divided into clockwise component and counterclockwise component;
Be input in the high non-linearity Dispersion Flattened Fiber (10) after the flashlight coupling that the clockwise component of first coupling mechanism (9) or counterclockwise component and second coupling mechanism (8) receive, produce phase modulated signal;
Phase modulated signal and counterclockwise component or clockwise component arrive first coupling mechanism (9) simultaneously, from first coupling mechanism (9) output transform the flashlight and the former wavelength signals light of wavelength.
8. the broad band wavelength transform method based on the high non-linearity Dispersion Flattened Fiber as claimed in claim 1 is characterized in that: in the conversion process, adjustment Polarization Controller (11) makes the output signal of Sagnac interference ring the strongest.
9. the broad band wavelength transform method based on the high non-linearity Dispersion Flattened Fiber as claimed in claim 1; It is characterized in that: the conversion that will from first coupling mechanism (9), export the flashlight and the former wavelength signals light of wavelength be input to wave filter (12), the flashlight of wavelength that obtained conversion.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103592805A (en) * | 2013-11-28 | 2014-02-19 | 武汉光迅科技股份有限公司 | Phase modulation signal full-optical wavelength conversion device |
| CN107129931A (en) * | 2017-06-27 | 2017-09-05 | 中国计量科学研究院 | Biomolecule fluorescence detector metrological standard unit and application method |
| CN109211527A (en) * | 2017-07-06 | 2019-01-15 | 住友电气工业株式会社 | Optical fiber output beam profile measurement method and optical fiber output beam profile measuring device |
| US11469567B2 (en) | 2020-03-13 | 2022-10-11 | The Board Of Trustees Of The Leland Stanford Junior University | Nonlinear optical devices based on quasi-phase-matched interactions in dispersion-engineered nanophotonics |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592805A (en) * | 2013-11-28 | 2014-02-19 | 武汉光迅科技股份有限公司 | Phase modulation signal full-optical wavelength conversion device |
| CN103592805B (en) * | 2013-11-28 | 2015-11-11 | 武汉光迅科技股份有限公司 | A kind of full optical wavelength converting device of phase modulated signal |
| CN107129931A (en) * | 2017-06-27 | 2017-09-05 | 中国计量科学研究院 | Biomolecule fluorescence detector metrological standard unit and application method |
| CN107129931B (en) * | 2017-06-27 | 2023-04-18 | 中国计量科学研究院 | Biomolecule optical detector metering standard device and use method |
| CN109211527A (en) * | 2017-07-06 | 2019-01-15 | 住友电气工业株式会社 | Optical fiber output beam profile measurement method and optical fiber output beam profile measuring device |
| US11469567B2 (en) | 2020-03-13 | 2022-10-11 | The Board Of Trustees Of The Leland Stanford Junior University | Nonlinear optical devices based on quasi-phase-matched interactions in dispersion-engineered nanophotonics |
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Application publication date: 20120711 |