CN109038186A - A kind of flat type erbium-ytterbium co-doped fiber light source - Google Patents
A kind of flat type erbium-ytterbium co-doped fiber light source Download PDFInfo
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- CN109038186A CN109038186A CN201810777894.3A CN201810777894A CN109038186A CN 109038186 A CN109038186 A CN 109038186A CN 201810777894 A CN201810777894 A CN 201810777894A CN 109038186 A CN109038186 A CN 109038186A
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- light source
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention belongs to rare-earth doped optical fibre light source fields, and in particular to a kind of flat type erbium-ytterbium co-doped fiber light source.The present invention includes pump light source, bundling device, erbium ytterbium co doped double clad fiber, fiber loop mirror, optical circulator, gain smoothing filter and reflecting mirror.The present invention is using single pump single-stage double-pass backward structure, using erbium ytterbium co doped double clad fiber as gain media, the transfer efficiency and Output optical power of pump light are further improved, the temperature performance of light source is improved, the volume for reducing light source is conducive to the superfluorescence spectrum for exporting high flat degree.
Description
Technical field
The invention belongs to rare-earth doped optical fibre light source fields, and in particular to a kind of flat type erbium-ytterbium co-doped fiber light source.
Background technique
Since 1550nm band of light meets eye-safe characteristic, and it is located at third low-loss communication window, therefore have
There is the rare-earth doped optical fibre light source of the wave band light output to obtain in fields such as medical treatment, optic communication, Fibre Optical Sensor and optical device tests
It is widely applied.Currently, the research and application of Er-Doped superfluorescent fiber source have been relatively mature, and have been realized in commercialization.
Er-Doped superfluorescent fiber source application in, usually require that its with high output power, to improve signal-to-noise ratio, especially
Ground, light source power are an important indicators for measuring high-precision optical fiber gyro optical fiber source performance.Improve Er-doped fiber light
The Output optical power in source is generally realized by following two mode.First is that improving pump light to the input work of gain erbium optical fiber
Rate, but can carry out heat dissipation problem to strip of light, more stringent requirements are proposed for this performance to light source temperature control circuit；Simultaneously because mixing
The core diameter of erbium optical fiber is smaller, cause can efficient coupling enter fibre core pump power it is lower, erbium ion is to pump light
Absorption efficiency is limited, this also constrains further increasing for output power；Second is that the doping for increasing erbium ion in gain fibre is dense
Degree, but higher ion concentration can be such that erbium ion largely assembles and generate concentration quenching, can reduce the suction to pump light instead
It receives.On the other hand, since the amplified spontaneous emission (ASE) that Er-doped fiber generates has the increasing of non-flat forms near 1532nm wavelength
Benefit spectrum, this applies band in wavelength-division multiplex (WDM) and dense wave division multipurpose (DWDM) system etc. to Er-Doped superfluorescent fiber source
Come capacity and bandwidth reduce it is unfavorable.
It is of the invention that solve erbium ion in existing Er-Doped superfluorescent fiber source low to the absorption efficiency of pump light and restrict light source
The problem of Output optical power, moreover it is possible to solve the problems, such as that light source output spectrum spectrum shape is uneven, the present invention proposes a kind of flat type erbium
Ytterbium co-doped fiber light source using multimode semiconductor laser as pump light source, and is adopted for single pump single-stage double-pass backward structure
It uses erbium ytterbium co doped double clad fiber as gain media, further improves pumping light conversion efficiency and Output optical power, improve
Temperature performance, reduces light source volume, is conducive to the superfluorescence spectrum for exporting high flat degree.
Summary of the invention
The purpose of the present invention is to provide a kind of flat type erbium-ytterbium co-doped fiber light source, which solves existing mix
In erbium optical fiber source erbium ion it is low to the absorption efficiency of pump light and the problem of restrict source device output optical power, and solve defeated
Spectrum composes the uneven problem of shape out.
The object of the present invention is achieved like this:
A kind of flat type erbium-ytterbium co-doped fiber light source, the light source include pump light source 1, bundling device 2, erbium and ytterbium codoping pair
Cladded-fiber 3, fiber loop mirror 4, optical circulator 5, optical circulator port 5-1, optical circulator port 5-2, optical circulator port
5-3, gain smoothing filter 6 and reflecting mirror 7, the tail optical fiber of pump light source 1 and the pumping end of bundling device 2 enter fine welding, bundling device 2
Output end tail optical fiber and erbium ytterbium co doped double clad fiber 3 one end welding, the other end and optical fiber of erbium ytterbium co doped double clad fiber 3
Annular mirror 4 enters fine welding, and the signal end tail optical fiber of bundling device 2 and optical circulator port 5-1's enters fine welding, optical circulator port
The tail optical fiber of 5-2 and one end welding of gain smoothing filter 6, the other end of gain smoothing filter 6 and the fibre that enters of reflecting mirror 7 melt
It connects, the superfluorescence of the tail optical fiber output 1550nm wave band of optical circulator port 5-3.
The pump light source 1 is multimode semiconductor laser, optical maser wavelength 975nm.
The bundling device 2 is that multimode pumps plus signal light type bundling device, and signal light wavelength range is 1520-1570
(1550) nm, pump wavelength range are 800-1000nm, and port type is (1+1) × 1 type.
The erbium ytterbium co doped double clad fiber 3 is single mode erbium ytterbium co doped double clad fiber.
The fiber loop mirror 4 is made of two output end weldings of broadband three-dB coupler, reflectivity up to 95% with
On, the operation wavelength of fiber loop mirror 4 is 1550nm.
The optical circulator 5 is three ports light rings, operation wavelength 1550nm.
The operation wavelength of the gain smoothing filter 6 is 1550nm.
The reflecting mirror 7 is faraday rotator mirror, operation wavelength 1550nm.
The beneficial effects of the present invention are: the present invention proposes a kind of happy flat type erbium-ytterbium co-doped fiber light source, using erbium ytterbium
Co-doped double-clad fiber 3 is used as gain media, uses multimode semiconductor laser as pump light source 1, reduces optical fiber source
Requirement to pump mode is conducive to the coupling efficiency for improving pump light, reduces the length of gain media optical fiber, further mention
The high transfer efficiency and Output optical power of pump light source 1；And using multimode semiconductor laser as pump light source 1, thus
The temperature performance of light source is improved, requirement of the light source to temperature control circuit is reduced, is conducive to reduce light source volume；Pass through optical circulator
The transmission direction of 5 control signal lights avoids that resonance occurs and generates laser between the signal light of different transmission directions, avoids simultaneously
Output end face echo has an impact the output of light source；Gain smoothing filter is added between optical circulator 5 and reflecting mirror 7
6, make signal light back and forth by filtering twice, to further increase the flatness of output spectrum.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is sensitized ions Yb in erbium ytterbium co doped double clad fiber of the invention3+In SiO2In absorption spectra and emission spectra；
Fig. 3 is the structure and its light wave transmissions schematic diagram of erbium ytterbium co doped double clad fiber of the invention.
Specific embodiment:
The present invention will be further described by 1-3 with reference to the accompanying drawing:
Embodiment 1
Flat type erbium-ytterbium co-doped fiber light source of the present invention is using single pump single-stage double-pass backward structure, including pump light source 1, conjunction
Beam device 2, erbium ytterbium co doped double clad fiber 3, fiber loop mirror 4, optical circulator 5, optical circulator port 5-1, optical circulator port
5-2, optical circulator port 5-3, gain smoothing filter 6 and reflecting mirror 7, select multimode semiconductor laser as pump light source
1, the pump light that it is exported is coupled into erbium ytterbium co doped double clad fiber 3 by bundling device 2, erbium ytterbium co doped double clad fiber 3
The middle Yb as sensitizer3+Acceptor ion Er is transferred energy to after absorbing pump light3+, Er3+Energy level jump occurs after absorbing energy
The forward and backward superfluorescence for generating and propagating respectively along erbium ytterbium co doped double clad fiber 3 is moved, backward superfluorescence passes through fiber annular
Mirror 4 is again introduced into erbium ytterbium co doped double clad fiber 3 after reflecting to be amplified and is superimposed with forward direction superfluorescence, and it is stronger to form power
Backward superfluorescence be input to optical circulator port 5-1 by bundling device 2, gain is then input to by optical circulator port 5-2
Light outside 6 pairs of bands of flat filter is filtered, and filtered light is input to reflecting mirror 7, defeated again after the reflection of reflecting mirror 7
Enter to gain smoothing filter 6 and filtered again, the 1550nm wave band superfluorescence of acquisition passes through the tail of optical circulator port 5-3
Fibre output.
As shown in Figure 1, the tail optical fiber for the pump light source 1 that wavelength is 975nm and port type are the bundling device 2 of (1+1) × 1
Pumping end enters fine welding, and port type is the output end tail optical fiber and erbium ytterbium co doped double clad fiber 3 of the bundling device 2 of (1+1) × 1
One end welding, the other end and wavelength of erbium ytterbium co doped double clad fiber 3 are the fine welding that enters of the fiber loop mirror 4 of 1550nm, end
Mouth type is the optical circulator port 5-1 for three ports that the signal end tail optical fiber of the bundling device 2 of (1+1) × 1 is 1550nm with wavelength
Enter fine welding, the gain that the tail optical fiber and wavelength of the optical circulator port 5-2 for three ports that wavelength is 1550nm are 1550nm is flat
One end welding of smooth filter 6, the reflection that the other end and wavelength for the gain smoothing filter 6 that wavelength is 1550nm are 1550nm
Mirror 7 enters fine welding, and it is super glimmering that the tail optical fiber that wavelength is the optical circulator port 5-3 of three ports of 1550nm exports 1550nm wave band
Light.
Pump light source 1 is used to export the pump light of 975nm.
The 975nm coupling pump light for pumping end input through it is entered erbium ytterbium co doped double clad fiber 3 by 2 one side of bundling device
In；On the other hand the superfluorescence inputted through its output end is output in optical circulator 5 by its signal end.
3 one side of erbium ytterbium co doped double clad fiber as light source gain media for absorb pump light and generate forward, to
The superfluorescence that latter two direction is propagated；On the other hand the backward superfluorescence reflected by fiber loop mirror 4 is reuptaked
And amplification.
The backward superfluorescence that 4 one side of fiber loop mirror is used to export erbium ytterbium co doped double clad fiber 3 reflects, with
To superfluorescent output power before increase erbium ytterbium co doped double clad fiber 3；On the other hand, fiber loop mirror 4 is double to erbium and ytterbium codoping
The backward superfluorescence that cladded-fiber 3 exports carries out planarization process.
Three ports light rings 5 are used to control the transmission direction of signal light, by the light of optical circulator port 5-1 input from light
Circulator port 5-2 output, and can only be exported from optical circulator port 5-3 by the light that optical circulator port 5-2 is inputted.Therefore light
Light reflection is avoided between circulator port 5-1 and optical circulator port 5-2 and is formed by laser, moreover it is possible to be prevented by optical circulator
The reflected light of port 5-2 input enters in erbium ytterbium co doped double clad fiber 3 by bundling device 2 to be formed lasing and introduces intensity noise
And phase noise；Optical circulator port 5-3 avoids the reflected light at light source output end to shadow caused by light source stability simultaneously
It rings.
Gain smoothing filter 6 is used to be filtered the superfluorescence exported by optical circulator port 5-2, and to by anti-
The superfluorescence for penetrating the reflection output of mirror 7 carries out secondary filtering, further improves the gain flatness of output spectrum.
7 one side of reflecting mirror is used to reflect the flat fluorescence Spectra exported after the filtering of gain smoothing filter 6,
Improve the Output optical power of light source；On the other hand the Polarization-Dependent Gain value of light source is reduced.
Er-doped fiber will reach the 1550nm wave band output of high-gain, need the Er of enough quantity3+To absorb pumping
Light energy, but in higher Er3+Serious erbium ion clustering phenomena can be generated under doping concentration, that is, concentration quenching occurs.This hair
It is bright that the above problem has then been well solved as light source gain media using erbium ytterbium co doped double clad fiber 3.Due to Yb3+Two energy levels
It is apart from each other, radiationless cross-relaxation, therefore Yb are difficult to happen between different energy levels3+There is no concentration quenching under high doping.In fibre core
Mix a certain amount of Yb as sensitizer3+, pass through Yb3+First pump light is absorbed, then Er is transmitted to by energy transmission effect3 +, significantly reduce the concentration quenching effect of erbium ion.
Ytterbium ion has wider absorption bands within the scope of 800 to 1100nm, increases the selectivity to pumping wavelength.
Fig. 2 is sensitized ions Yb in erbium-ytterbium co-doped fiber of the invention3+In SiO2In absorption spectra and emission spectra, ytterbium ion is in 915nm
There are two absorption peaks at 975nm, and there are two emission peaks at 975nm and 1036nm.Due to Yb3+Have at 915nm one very
Wide absorption peak, so Yb3+It is usually used in transmitting power to other Doped ions.Due to Yb3+Absorption cross-section at 975nm
3 times of absorption cross-section at about 915nm, therefore as a preferred embodiment, pump light source wavelength selection of the invention is
975nm。
The present invention uses gain media of the erbium ytterbium co doped double clad fiber as light source, is made using multimode semiconductor laser
For pump light source, the requirement to pump mode is reduced, while pump mode is cladding pumping, improves the coupling to pump light
Efficiency.The erbium ytterbium co doped double clad fiber 3 that the present invention uses, in the way of the special construction of this optical fiber and light wave transmissions, such as
Shown in Fig. 3, signal light transmits in fibre core, and pump light has been directly coupled to lateral dimension and numerical value aperture ratio fibre core is much bigger
Inner cladding in, and reflected back and forth on the interface of inner cladding and surrounding layer, reflected light passes through fibre core repeatedly, and activation increases
Beneficial medium generates more activation Er3+Signal light is amplified.
In conclusion a kind of flat type erbium-ytterbium co-doped fiber light source technology scheme proposed by the present invention, using erbium and ytterbium codoping
Doubly clad optical fiber 3 is used as gain media, uses multimode semiconductor laser as pump light source 1, reduces to pump mode
It is required that improving the coupling efficiency of pump light, reduce the length of gain media optical fiber, further improves the conversion effect of pump light
Rate and Output optical power；And light-source temperature performance is improved as pump light source 1 using multimode semiconductor laser, reduce light
Requirement of the source to temperature control circuit, reduces light source volume；The transmission direction that signal light is controlled by optical circulator 5, avoids difference
Resonance occurs between the signal light of transmission direction and generates laser, while avoiding output end face echo and the output of light source is generated
It influences；Gain smoothing filter 6 is added between optical circulator 5 and reflecting mirror 7, makes signal light back and forth by filtering twice, into
One step improves the flatness of output spectrum.
Here it must be noted that other unaccounted embodiments and the structure explanation provided in the present invention is because be all
The known manner and known features of this field, title according to the present invention or description, those skilled in the art can look for
The document recorded to correlation, therefore be not described further.Technological means disclosed in this programme is not limited only to above-mentioned embodiment party
Technological means disclosed in formula further includes technology consisting of any combination of the above technical features.
Claims (8)
1. a kind of flat type erbium-ytterbium co-doped fiber light source, it is characterised in that: the light source includes pump light source (1), bundling device
(2), erbium ytterbium co doped double clad fiber (3), fiber loop mirror (4), optical circulator (5), optical circulator port (5-1), ring of light shape
Device port (5-2), optical circulator port (5-3), gain smoothing filter (6) and reflecting mirror (7), the tail optical fiber of pump light source (1)
Enter fine welding with the pumping end of bundling device (2), the one of the output end tail optical fiber of bundling device (2) and erbium ytterbium co doped double clad fiber (3)
Hold welding, the other end of erbium ytterbium co doped double clad fiber (3) and fiber loop mirror (4) enter fine welding, the signal of bundling device (2)
End tail optical fiber enters fine welding, the tail optical fiber and gain smoothing filter of optical circulator port (5-2) with optical circulator port (5-1's)
(6) one end welding, the other end of gain smoothing filter (6) and reflecting mirror (7) enter fine welding, optical circulator port (5-
3) superfluorescence of tail optical fiber output 1550nm wave band.
2. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the pump light source
It (1) is multimode semiconductor laser, optical maser wavelength 975nm.
3. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the bundling device
(2) plus signal light type bundling device is pumped for multimode, signal light wavelength range is 1520-1570 (1550) nm, pump wavelength model
It encloses for 800-1000nm, port type is (1+1) × 1 type.
4. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the erbium and ytterbium codoping
Doubly clad optical fiber (3) is single mode erbium ytterbium co doped double clad fiber.
5. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the fiber annular
Mirror (4) is made of two output end weldings of broadband three-dB coupler, and reflectivity is up to 95% or more, the work of fiber loop mirror (4)
Making wavelength is 1550nm.
6. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the optical circulator
It (5) is three ports light rings, operation wavelength 1550nm.
7. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the flat gain
The operation wavelength of filter (6) is 1550nm.
8. a kind of flat type erbium-ytterbium co-doped fiber light source according to claim 1, it is characterised in that: the reflecting mirror
It (7) is faraday rotator mirror, operation wavelength 1550nm.
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| CN110311731A (en) * | 2019-06-27 | 2019-10-08 | 中国电子科技集团公司第十三研究所 | Scanning light source output gain flatness lifting device and scanning light source |
| CN110380325A (en) * | 2019-07-31 | 2019-10-25 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
| CN110429459A (en) * | 2019-07-31 | 2019-11-08 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
| CN113659415A (en) * | 2021-08-09 | 2021-11-16 | 江苏亮点光电科技有限公司 | Low-power double-pass pulse amplification light path structure |
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| CN110429459A (en) * | 2019-07-31 | 2019-11-08 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
| CN113659415A (en) * | 2021-08-09 | 2021-11-16 | 江苏亮点光电科技有限公司 | Low-power double-pass pulse amplification light path structure |
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Application publication date: 20181218 |