CN101257178B - Double steady interval adjustable round bistable state erbium-doped optical fiber laser - Google Patents
Double steady interval adjustable round bistable state erbium-doped optical fiber laser Download PDFInfo
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- CN101257178B CN101257178B CN2008100342997A CN200810034299A CN101257178B CN 101257178 B CN101257178 B CN 101257178B CN 2008100342997 A CN2008100342997 A CN 2008100342997A CN 200810034299 A CN200810034299 A CN 200810034299A CN 101257178 B CN101257178 B CN 101257178B
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Abstract
The invention provides a circumduction bistable erbium-doped fiber laser adjustable in bistable region which belongs to optoelectronic device field. The laser includes: first pumped source, first WDM coupler, 10/90 fiber coupler, gain section erbium-doped fiber, second pumped source, third WDM coupler, absorption section erbium-doped fiber. First pumped source connects with first WDM coupler, first WDM coupler connects with gain section erbium-doped fiber, gain section erbium-doped fiber connects with second WDM coupler, second WDM coupler educes unfinished pumped light from circumduction cavity, second WDM coupler connects with third WDM coupler, second pumped source connects with absorption section erbium-doped fiber via third WDM coupler, absorption section erbium-doped fiber connects with 10/90 fiber coupler, 10/90 fiber coupler connect with first WDM coupler. Absorption section erbium-doped fiber leads to optical bistable phenomenon and can adjust optical bistable region size.
Description
Technical field
What the present invention relates to is a kind of device of laser technology field, specifically is the interval adjustable belt bistable state erbium doped fiber laser of a kind of bistable.
Background technology
Optical bistability is to cause a kind of new nonlinear optical phenomena that people pay attention in 15 years later in the laser invention.Optical bistability all has important application at aspects such as optical communication, photometry calculation, light sensing and laser intensity control technologys.With respect to electronic device, optical bistable device not only has similar various function, but also has many advantageous characteristic, and is fast etc. as anti-electromagnetic interference, response speed.In recent years, along with development of fiber technology, the optical bistable in the fiber laser became the focus of research gradually.
People such as Canada Qinghe Mao are at " IEEE PHOTONICS TECHNOLOGY LETTERS " (" photon technology wall bulletin ") VOL.14, NO.9, SEPTEMBER 2002 (in September, 2002, the 14th phase, the 9th page) in one piece of paper " Optical Bistability in an L-Band Dual-WavelengthErbium-Doped Fiber Laser With Overlapping Cavities " (the optical bistability phenomenon in the L section dual wavelength Compound Cavity erbium doped fiber laser) in the size of regulating the optical bistability interval by the cavity loss in the control fiber laser is proposed, this method enlarges the size in bistable state interval by increasing cavity loss, but can bring some efficiency.
Find by prior art documents, people such as Korea S Jung Mi Oh are at " IEEE JOURNAL OFQUANTUM ELECTRONICS " (" quantum electronics newspaper ") VOL.40, NO.4, APRIL 2004 (in April, 2004, the 40th phase, the 40th page) in one piece of paper " Strong Optical Bistability in aSimple L-Band Tunable Erbium-Doped Fiber Ring Laser " (high light is learned the bistable state phenomenon in the tunable L section annular erbium doped fiber laser) in provided optical bistability phenomenon in the annular erbium doped fiber laser, and point out can be by the length of adjusting Er-doped fiber in the laser and the size that optical maser wavelength is controlled the optical bistability interval.Yet for a specific erbium doped fiber laser, the length of the Er-doped fiber of its use is fixed, and the operation wavelength of laser also decides according to need of work.Therefore, the interval size of this control optical bistability has little significance.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, provide a kind of bistable interval adjustable belt bistable state erbium doped fiber laser, make it adopt two sections Er-doped fibers, one section as the gain body, another section is as absorber, produce the optical bistability phenomenon, change its absorbent properties, then can reach the purpose of regulating the interval size of bistable state by the Er-doped fiber as absorber is injected a small amount of pump light.
The present invention is achieved by the following technical solutions, the present invention includes: first pumping source, the one WDM (wavelength division multiplexing) coupler, the gain section Er-doped fiber, the 2nd WDM coupler, second pumping source, the 3rd WDM coupler, the absorber portion Er-doped fiber, 10/90 fiber coupler, wherein: first pumping source links to each other with the blue port of a WDM coupler, the black port of the one WDM coupler links to each other with gain section Er-doped fiber one end, the other end of gain section Er-doped fiber links to each other with the black port of the 2nd WDM coupler, the blue port of the 2nd WDM coupler is as the outlet of drawing unspent pump light in the gain section Er-doped fiber, the red port of the 2nd WDM coupler links to each other with the red port of the 3rd WDM coupler, second pumping source links to each other with an end of absorber portion Er-doped fiber by the blue port of the 3rd WDM coupler, the other end of absorber portion Er-doped fiber links to each other with the ripple end that closes of 10/90 fiber coupler, 90% port of 10/90 fiber coupler links to each other with the red port of first WDM coupler, constitutes a circular cavity optic fibre laser.
Described absorber portion Er-doped fiber links to each other with 10/90 fiber coupler by optical fiber filter.
Between described optical fiber filter and 10/90 fiber coupler, between absorber portion Er-doped fiber and the optical fiber filter or between 10/90 fiber coupler and the WDM coupler, be provided with fibre optic isolater, promptly fibre optic isolater is located at one of them of above-mentioned three positions.
When described fibre optic isolater was located between optical fiber filter and 10/90 fiber coupler, the inlet of fibre optic isolater linked to each other with the outlet of optical fiber filter, and the outlet of fibre optic isolater links to each other with the ripple end that closes of 10/90 fiber coupler.
When described fibre optic isolater is located between 10/90 fiber coupler and the WDM coupler, the inlet of fibre optic isolater and 10/90 fiber coupler 90% port link to each other, the outlet of fibre optic isolater links to each other with the red port of a WDM coupler.
Among the present invention, first pumping source provides pump energy for the gain section Er-doped fiber, the gain section Er-doped fiber gains to flashlight, the 2nd WDM coupler is drawn annular chamber to the pump light of gain section Er-doped fiber afterbody remnants, to prevent the absorbent properties of remnant pump influence of light absorber portion Er-doped fiber, and then the size in the bistable interval that has the greatest impact, the absorber portion Er-doped fiber is used for the absorption of flashlight, second pumping source is used to change the absorbent properties of absorber portion Er-doped fiber, to regulate the size in bistable state interval.The non-linear absorption performance of absorber portion Er-doped fiber is to produce bistable main cause, optical fiber filter be used to the to narrow bandwidth of laser, fibre optic isolater is used for guaranteeing the one-way transmission of laser at annular optical fiber laser, and 10/90 fiber coupler then is the output that is used for laser.
The present invention originally power output of first pumping source is zero, and the power output of second pumping source is zero.Progressively transfer the power output of big first pumping source, laser output is arranged until 10/90 fiber coupler place.If this moment, the power of first pumping source was P1mW.Then progressively turn the power output of first pumping source down, the laser until 10/90 fiber coupler place disappears.If the power of first pumping source that this moment is corresponding is P2mW.The interval Δ P1 of optical bistability then is P1-P2mW.The power output that transfer big 1: second pumping source this moment a little, identical with above-mentioned steps, record the interval Δ P2 of being of optical bistability.ΔP1＞ΔP2。Whole adjustable bistable workflow that Here it is.
Compared with prior art, the present invention has following beneficial effect: the present invention produces the optical bistability phenomenon by producing the absorber Er-doped fiber of nonlinear effect.By injecting the absorbent properties that pump light changes absorber, the size that then can regulate the bistable state interval.Regulative mode of the present invention is easy to use, and the amplitude of accommodation is big, can be adjusted to zero from the maximum in bistable state interval.
Description of drawings
Fig. 1 structural representation of the present invention;
Adjustable double steady state phenomena figure among Fig. 2 the present invention;
The graph of a relation of the interval size of the bistable state among Fig. 3 the present invention and the second pumping source energy.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: first pumping source 1, a WDM coupler 2, gain section Er-doped fiber 3, the 2nd WDM coupler 4, second pumping source 5, the 3rd WDM coupler 6, absorber portion Er-doped fiber 7,10/90 fiber coupler 9, wherein:
Described absorber portion Er-doped fiber 7 links to each other with 10/90 fiber coupler 9 by optical fiber filter 8.
Between described optical fiber filter 8 and 10/90 fiber coupler 9, between 10/90 fiber coupler 9 and the WDM coupler 2 or between absorber portion Er-doped fiber 7 and the optical fiber filter 8, be provided with fibre optic isolater, promptly fibre optic isolater 10 be located at above-mentioned three positions one of them.
When described fibre optic isolater 10 was located between optical fiber filter 8 and 10/90 fiber coupler 9, the inlet of fibre optic isolater 10 linked to each other with the outlet of optical fiber filter 8, and the outlet of fibre optic isolater 10 links to each other with the ripple end that closes of 10/90 fiber coupler 9.
When described fibre optic isolater 10 is located between 10/90 fiber coupler 9 and the WDM coupler 2, the inlet of fibre optic isolater 10 and 10/90 fiber coupler 9 90% port link to each other, the outlet of fibre optic isolater 10 links to each other with the red port of a WDM coupler 2.
In the present embodiment, first pumping source 1 provides pump energy for gain section Er-doped fiber 3,3 pairs of flashlights of gain section Er-doped fiber gain, the 2nd WDM coupler 2 is drawn annular chamber to the pump light of gain section Er-doped fiber 3 afterbody remnants, to prevent the absorbent properties of remnant pump influence of light absorber portion Er-doped fiber 7, and then the size in the bistable interval that has the greatest impact, absorber portion Er-doped fiber 7 is used for the absorption of flashlight, second pumping source 5 is used to change the absorbent properties of absorber portion Er-doped fiber 7, to regulate the size in bistable state interval, absorber portion Er-doped fiber 7 carries out non-linear absorption, optical fiber filter 8 be used to the to narrow bandwidth of laser, fibre optic isolater 8 is used for guaranteeing the one-way transmission of laser at annular optical fiber laser, and 9 of 10/90 fiber couplers are the output that is used for laser.
Present embodiment is when setting to zero the output of second pumping source 5, regulate the watt level of first pumping source 1, when the power volume of first pumping source 1 was 62.5 milliwatts, this power was called the rising pumping threshold of laser, and laser output is arranged at 10/90 fiber coupler, 9 places.Turn the power of first pumping source 1 this moment down, and when being adjusted to 47.1 milliwatts, this power is called the decline pumping threshold of laser, just disappears at 10/90 fiber coupler, 9 place's laser.The phenomenon that the rising pumping threshold of this laser is bigger than decline pumping threshold is called as the optical bistability phenomenon in the annular optical fiber laser.In the whole bistable state process when second pumping source 5 is 0mW and 0.93mW, the relative power of 10/90 fiber coupler, 9 places output laser and the relation curve of the first pumping source power are as shown in Figure 2, wherein, the energy of second pumping source 5 is 0mW, the interval size of bistable state is 15.4 milliwatts (62.5 milliwatts-47.1 milliwatts) for the difference of rising pumping threshold and decline pumping threshold, as the point of 0 among Fig. 3.The energy of second pumping source 5 is 0.93mW, and the interval size of bistable state is 5.3mW for the difference of rising pumping threshold and decline pumping threshold.
And then if the power of second pumping source 5 is adjusted to 0.46 milliwatt, the interval size of the optical bistability that record this moment is 12.2 milliwatts, as the point of the P among Fig. 3.When the power of second pumping source 5 was 9.6 milliwatts, the interval size of optical bistability was zero, as the point of the Q among Fig. 3, did not promptly have the optical bistability phenomenon this moment.7 influences of 5 pairs of absorber portion Er-doped fibers of second pumping source can change the interval size of optical bistability in the laser rapidly.
Claims (6)
1. the interval adjustable belt bistable state erbium doped fiber laser of a bistable, comprise: first pumping source, the one WDM coupler, 10/90 fiber coupler, it is characterized in that, also comprise: the gain section Er-doped fiber, the 2nd WDM coupler, second pumping source, the 3rd WDM coupler, the absorber portion Er-doped fiber, wherein: first pumping source links to each other with the blue port of a WDM coupler, the black port of the one WDM coupler links to each other with gain section Er-doped fiber one end, the other end of gain section Er-doped fiber links to each other with the black port of the 2nd WDM coupler, the blue port of the 2nd WDM coupler is as the outlet of drawing unspent pump light in the gain section Er-doped fiber, the red port of the 2nd WDM coupler links to each other with the red port of the 3rd WDM coupler, second pumping source links to each other with an end of absorber portion Er-doped fiber by the blue port of the 3rd WDM coupler, the other end of absorber portion Er-doped fiber links to each other with the ripple end that closes of 10/90 fiber coupler, 90% port of 10/90 fiber coupler links to each other with the red port of first WDM coupler, constitutes a circular cavity optic fibre laser.
2. the interval adjustable belt bistable state erbium doped fiber laser of bistable according to claim 1 is characterized in that described absorber portion Er-doped fiber links to each other with 10/90 fiber coupler by optical fiber filter.
3. the interval adjustable belt bistable state erbium doped fiber laser of bistable according to claim 2 is characterized in that, between described optical fiber filter and 10/90 fiber coupler or between optical fiber filter and the absorber portion Er-doped fiber, is provided with fibre optic isolater.
4. the interval adjustable belt bistable state erbium doped fiber laser of bistable according to claim 3, it is characterized in that, when described fibre optic isolater is located between optical fiber filter and 10/90 fiber coupler, the inlet of fibre optic isolater links to each other with the outlet of optical fiber filter, and the outlet of fibre optic isolater links to each other with the ripple end that closes of 10/90 fiber coupler.
5. the interval adjustable belt bistable state erbium doped fiber laser of bistable according to claim 1 is characterized in that, is provided with fibre optic isolater between described 10/90 fiber coupler and the WDM coupler.
6. the interval adjustable belt bistable state erbium doped fiber laser of bistable according to claim 5, it is characterized in that, described fibre optic isolater, its inlet with 10/90 fiber coupler 90% port link to each other, the outlet of fibre optic isolater links to each other with the red port of a WDM coupler.
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| CN2008100342997A CN101257178B (en) | 2008-03-06 | 2008-03-06 | Double steady interval adjustable round bistable state erbium-doped optical fiber laser |
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| CN2008100342997A CN101257178B (en) | 2008-03-06 | 2008-03-06 | Double steady interval adjustable round bistable state erbium-doped optical fiber laser |
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| CN101257178B true CN101257178B (en) | 2010-06-30 |
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| CN102064456B (en) * | 2010-11-30 | 2011-12-28 | 中国科学院半导体研究所 | Er-doped superfluorescent optical fiber light source structure for optical fiber gyroscope |
| CN107302175B (en) * | 2017-06-21 | 2019-10-22 | 安徽大学 | A kind of all-optical switch based on outfield auxiliary control |
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