CN104752943A - Interference structure-based dual-wavelength fiber laser - Google Patents
Interference structure-based dual-wavelength fiber laser Download PDFInfo
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- CN104752943A CN104752943A CN201510206106.1A CN201510206106A CN104752943A CN 104752943 A CN104752943 A CN 104752943A CN 201510206106 A CN201510206106 A CN 201510206106A CN 104752943 A CN104752943 A CN 104752943A
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Abstract
The invention discloses an interference structure-based dual-wavelength fiber laser, which consists of a wavelength division multiplexer, Er-doped fibers, an opto-isolator, an interference structure, a variable optical attenuator and an optical coupler; an annular resonant cavity is formed by connecting single mode fibers. The interference structure-based dual-wavelength fiber laser disclosed by the invention has the advantages that by taking the SMS fiber interference structure as a filter of a laser cavity, the dual-wavelength fiber laser is simple in structure and easy to manufacture; moreover, the dual-wavelength fiber laser has switchable and tunable characteristics of wave length, and has a wide application prospect in the field of coherent light communication, optical fiber sensing, high-precision spectral measurement and the like.
Description
Technical field
The invention belongs to fiber optic communication field, particularly a kind of dual wavelength fibre laser based on interference structure.
Background technology
The communication technology, sensing technology and computer technology are three large pillars of modern information technologies.As an important component part of fiber optic communication field, owing to having, the advantage such as noise is little, line width, electromagnetism interference becomes one of focus of people's research to fiber laser.
As the important a member in fiber laser family, dual wavelength fibre laser has a wide range of applications in fields such as coherent optical communication, Fibre Optical Sensor, high accuracy spectral measurements, and, relevant detection is carried out to dual-wavelength laser signal, the beat signal obtained can be used as frequency microwave signal, can be used for the generation of microwave, millimeter wave.Along with the fast development of wavelength division multiplexing (WDM) system, the Laser Study with lambda switch function is more and more subject to people's attention.The fiber laser of tunable wave length can solve the deficiency that laser with fixed wavelength exists effectively, and in minimizing system, the inventory of light source and specification, make the operation cost of system and maintenance cost significantly reduce.Therefore, study that can open, that there is tuber function dual wavelength fibre laser to have important practical significance.
Summary of the invention
The object of the invention is for above-mentioned technical Analysis, provide a kind of dual wavelength fibre laser based on interference structure, this dual wavelength fibre laser structure is simple, make easily, and there is wavelength can switch and tunable characteristic.
Technical scheme of the present invention:
Based on a dual wavelength fibre laser for interference structure, formed by 980nm/1480nm pumping source, wavelength division multiplexer, Er-doped fiber, optical isolator, optical coupler a, SMS interference structure a and SMS interference structure b, variable optical attenuator and optical coupler b and connected and composed ring resonator by monomode fiber; Three ports of wavelength division multiplexer are respectively input a, output b and input c, and wherein input a is connected with 980nm/1480nm pumping source, and output b is connected with optical isolator through Er-doped fiber; Three ports of optical coupler a are respectively input d and output e, f, and wherein input d is connected with optical isolator, and output e is connected with SMS interference structure a, and Ausgang is connected with SMS interference structure b by variable optical attenuator; Four ports of optical coupler b are respectively input g, h and output m, n, wherein input g, h is connected with SMS interference structure b with SMS interference structure a respectively, output m is connected with the input c of wavelength division multiplexer, and output n is the output of whole fiber laser and is connected with spectroanalysis instrument.
The preparation method of described SMS interference structure: SMS interference structure a and SMS interference structure b all adopts SMS fiber interference structure, this structure is formed by input monomode fiber, multimode fiber, the welding of output monomode fiber, monomode fiber all adopts standard size, the diameter of its fibre core/covering is 8.2/125 μm, the SI2014-D that multimode fiber adopts Chang Fei company to produce, its cladding diameter is 125 μm, core diameter is 50 μm; First by one end welding of input monomode fiber and multimode fiber, the length of multimode fiber is 3-6cm, then by the other end of multimode fiber and the welding of output monomode fiber, can obtain SMS interference structure.
Advantage of the present invention and beneficial effect are:
This dual wavelength fibre laser structure is simple, make easily, and there is wavelength can switch and tunable characteristic, have a wide range of applications in many fields such as coherent optical communication, Fibre Optical Sensor, high accuracy spectral measurements.
Accompanying drawing explanation
Fig. 1 is this dual wavelength fibre laser schematic diagram based on interference structure.
Fig. 2 is SMS fiber interference structure schematic diagram.
In figure: 1.980nm/1480nm pumping source 2. wavelength division multiplexer 3. Er-doped fiber 4. optical isolator 5. optical coupler a 6.SMS interference structure a 7.SMS interference structure b 8. variable optical attenuator 9. optical coupler b 10. spectroanalysis instrument 11. input monomode fiber 12. multimode fiber 13. output monomode fiber.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment:
A kind of dual wavelength fibre laser based on interference structure, as shown in Figure 1, formed by 980nm/1480nm pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, optical isolator 4, optical coupler a5, SMS interference structure a6 and SMS interference structure b7, variable optical attenuator 8 and optical coupler b9 and connected and composed ring resonator by monomode fiber; Three ports of wavelength division multiplexer 2 are respectively input a, output b and input c, and wherein input a is connected with 980nm/1480nm pumping source 1, and output b is connected with optical isolator 4 through Er-doped fiber 3; Three ports of optical coupler a5 are respectively input d and output e, f, and wherein input d is connected with optical isolator 4, and output e is connected with SMS interference structure a6, and Ausgang is connected with SMS interference structure b7 by variable optical attenuator 8; Four ports of optical coupler b9 are respectively input g, h and output m, n, wherein input g, h is connected with SMS interference structure b7 with SMS interference structure a6 respectively, output m is connected with the input c of wavelength division multiplexer 2, and output n is the output of whole fiber laser and is connected with spectroanalysis instrument 10.
The preparation method of described SMS interference structure: SMS interference structure a and SMS interference structure b all adopts SMS fiber interference structure, as shown in Figure 2, this structure is formed by input monomode fiber 11, multimode fiber 12, output monomode fiber 13 welding, monomode fiber 11 adopts standard size, the diameter of its fibre core/covering is 8.2/125 μm, the SI2014-D that multimode fiber 12 adopts Chang Fei company to produce, its cladding diameter is 125 μm, core diameter is 50 μm.First by one end welding of input monomode fiber 11 with multimode fiber 12, the length of multimode fiber 12 is 3-6cm, then by the other end of multimode fiber 12 and output monomode fiber 13 welding, can obtain SMS fiber interference structure.
Operation principle of the present invention:
Pump light inputs Er-doped fiber through the port b of wavelength division multiplexer, ensures light one-way transmission in ring resonator, then incide the optical coupler of a 50:50 by optical isolator, and light is divided into two-way propagation afterwards.Wherein A road light transmits in SMS interference structure a, and B road light is transmitted in SMS interference structure b by variable optical attenuator, variable optical attenuator is placed in B road, loss then in chamber, B road can be regulated by variable optical attenuator, and then the laser of output is changed between two-way, when two-way cavity loss balances, the output of dual-wavelength laser can be obtained.Advance when SMS interference structure a is fixed on displacement platform, SMS interference structure a is bent, its transmission spectrum passband drifts about to shortwave direction, the laser signal produced by SMS interference structure a filtering also drifts about along with to shortwave direction, and the laser signal produced by SMS interference structure b frequency-selecting is unaffected, centre wavelength does not change, and the wavelength interval of the dual wavelength therefore obtained can be carried out tuning by this method.
Claims (2)
1. based on a dual wavelength fibre laser for interference structure, it is characterized in that: formed by 980nm/1480nm pumping source, wavelength division multiplexer, Er-doped fiber, optical isolator, optical coupler a, SMS interference structure a and SMS interference structure b, variable optical attenuator and optical coupler b and connected and composed ring resonator by monomode fiber; Three ports of wavelength division multiplexer are respectively input a, output b and input c, and wherein input a is connected with 980nm/1480nm pumping source, and output b is connected with optical isolator through Er-doped fiber; Three ports of optical coupler a are respectively input d and output e, f, and wherein input d is connected with optical isolator, and output e is connected with SMS interference structure a, and Ausgang is connected with SMS interference structure b by variable optical attenuator; Four ports of optical coupler b are respectively input g, h and output m, n, wherein input g, h is connected with SMS interference structure b with SMS interference structure a respectively, output m is connected with the input c of wavelength division multiplexer, and output n is the output of whole fiber laser and is connected with spectroanalysis instrument.
2. according to claim 1 based on the dual wavelength fibre laser of interference structure, it is characterized in that: the preparation method of described SMS interference structure: SMS interference structure a and SMS interference structure b all adopts SMS fiber interference structure, this structure is formed by input monomode fiber, multimode fiber, the welding of output monomode fiber, monomode fiber all adopts standard size, the diameter of its fibre core/covering is 8.2/125 μm, the SI2014-D that multimode fiber adopts Chang Fei company to produce, its cladding diameter is 125 μm, core diameter is 50 μm; First by one end welding of input monomode fiber and multimode fiber, the length of multimode fiber is 3-6cm, then by the other end of multimode fiber and the welding of output monomode fiber, can obtain SMS interference structure.
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| CN201510206106.1A CN104752943A (en) | 2015-04-27 | 2015-04-27 | Interference structure-based dual-wavelength fiber laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115939A (en) * | 2015-07-28 | 2015-12-02 | 重庆大学 | Tapered multimode interference-based high-sensitivity optical fiber methane sensing device |
| CN108646333A (en) * | 2018-07-02 | 2018-10-12 | 苏州龙格库塔光电科技有限公司 | Super model interference filter and fiber optic wavelength tunable mode-locked laser |
| CN108957795A (en) * | 2018-08-10 | 2018-12-07 | 长春理工大学 | A kind of optical interferometer and tunable wave length full-optical-fiber laser |
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| CN105115939B (en) * | 2015-07-28 | 2017-11-28 | 重庆大学 | A kind of high sensitivity optical fiber methane sensing device based on tapered multimode interference |
| CN108646333A (en) * | 2018-07-02 | 2018-10-12 | 苏州龙格库塔光电科技有限公司 | Super model interference filter and fiber optic wavelength tunable mode-locked laser |
| CN108957795A (en) * | 2018-08-10 | 2018-12-07 | 长春理工大学 | A kind of optical interferometer and tunable wave length full-optical-fiber laser |
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