CN110380325A - A kind of fiber amplifier - Google Patents
A kind of fiber amplifier Download PDFInfo
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- CN110380325A CN110380325A CN201910700020.2A CN201910700020A CN110380325A CN 110380325 A CN110380325 A CN 110380325A CN 201910700020 A CN201910700020 A CN 201910700020A CN 110380325 A CN110380325 A CN 110380325A
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- light
- amplification unit
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- collimator
- signal light
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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
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- 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
- H01S3/06754—Fibre amplifiers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The embodiment of the present invention provides a kind of fiber amplifier, comprising: seed source；First single mode collimator；Pumping source；Multimode collimator；And amplification optical path；Amplifying optical path includes at least one level optical amplification unit；Optical amplification unit includes at least first kind optical amplification unit；First kind optical amplification unit includes the first wavelength division multiplexer, optical circulator, the first gain fibre collimator, the first gain fibre and fiber bragg grating；Wherein, optical circulator is between the first wavelength division multiplexer and the first gain fibre collimator, and the first gain fibre is between the first gain fibre collimator and fiber bragg grating；Backtracking after the signal light and pump light of each layer conduction are reflected by fiber bragg grating in the first gain fibre, so that signal light passes through the amplification of the first gain fibre twice, and is emitted from optical circulator.The embodiment of the present invention is to realize the miniaturization of fiber amplifier.
Description
Technical field
The present embodiments relate to amplifier technique more particularly to a kind of fiber amplifiers.
Background technique
Various fiber amplifiers, such as EDFA Erbium-Doped Fiber Amplifier (EDFAs) and distributed raman amplifier (DRAs)
It is the device generally used in optical communication system.Fiber amplifier has become the key equipment in optical fiber telecommunications system.Light
Fiber amplifier can effective compensation signal light decay caused by the long distance transmission and partial wave, greatly pushed fiber optic communication system
The development of system.
Pump light and signal light are combined into gain light using wavelength division multiplexer in traditional fiber amplifier
In fine (such as bait is fine).Bait fibre includes fibre core and the fibre cladding and surrounding layer that are coated on outside fibre core.Wavelength division multiplexer needs
So that signal light is entered fibre core and pump light is made to enter fibre cladding.Existing way is the technique side using fused biconical taper
Method is realized.This implementation method needs biggish space.
Summary of the invention
The embodiment of the present invention provides a kind of fiber amplifier, to realize the miniaturization of fiber amplifier.
The embodiment of the present invention provides a kind of fiber amplifier, comprising:
Seed source emits signal light；
First single mode collimator is connect by the first transmission fiber with the seed source, for the first transmission light
The signal light that fibre transmission comes is emitted in amplification optical path after being collimated；
Pumping source emits pump light；The pump light has the wavelength different from the signal light；
Multimode collimator is connect by the second transmission fiber with the pumping source, for passing to second transmission fiber
Defeated next pump light is projected in the amplification optical path after being collimated；And
The amplification optical path；The amplification optical path includes at least one level optical amplification unit；The optical amplification unit at least wraps
Include first kind optical amplification unit；
The first kind optical amplification unit includes the first wavelength division multiplexer, optical circulator, the first gain fibre collimator, the
One gain fibre and fiber bragg grating；Wherein, the optical circulator is located at first wavelength division multiplexer and described the
Between one gain fibre collimator, first gain fibre is located at the first gain fibre collimator and the optical fiber Bradley
Between lattice grating；First gain fibre includes fibre core and the first covering being successively coated on outside the fibre core and second
Covering；First wavelength division multiplexer is used to carry out the pump light to be used as the same level pump light after at least partly reflecting, and permits
Perhaps the first light beam, which is synthesized, with the same level pump light after the described signal light transmission is projected to the first gain fibre collimator；It is described
First gain fibre collimator is used to converge first light beam so that the convergent point of the signal light is positioned at described
Before the incident end face of first gain fibre, the convergent point of the pump light be located at first gain fibre incident end face it
Afterwards, so that the signal light enters the fibre core, the pump light enters first covering in fibre core
Signal light amplifies；The signal light and the pump light of each layer conduction are by the light in first gain fibre
Backtracking after fine Bragg grating reflection, so that the signal light passes through the amplification of first gain fibre twice,
And it is emitted from the optical circulator.
Optionally, the signal light is projected to the wavelength-division multiplex of first order optical amplification unit by the first single mode collimator
There is the first hot spot when device；The pump light is projected to the wavelength division multiplexer of first order optical amplification unit by the multimode collimator
When have the second hot spot；First hot spot is less than second hot spot.
It optionally, further include the first reflecting mirror；First reflecting mirror is set to the first single mode collimator and described
Between the first order optical amplification unit of fiber amplifier, to be reflected the signal light so that the signal light is projected to institute
It states in amplification optical path；
Alternatively, first reflecting mirror is set to the first order light amplification of the multimode collimator and the fiber amplifier
Between unit, to be reflected the pump light so that the pump light is projected in the amplification optical path.
It optionally, further include the first isolation being set between the first single mode collimator and first order optical amplification unit
Device.
Optionally, the optical amplification unit further includes the second class optical amplification unit；
The second class optical amplification unit includes the second wavelength division multiplexer, the second gain fibre collimator, the second gain light
Fine and optical fiber output structure；Wherein, second gain fibre includes fibre core and is successively coated on outside the fibre core
First covering and the second covering；Second wavelength division multiplexer is used to carry out after at least partly reflecting as this pump light
Grade pump light, and allow to synthesize the second light beam with the same level pump light after the signal light transmission and be projected to the second gain light
Fine collimator；The second gain fibre collimator is for being converged the remittance so that the signal light to second light beam
Accumulation be located at the incident end face of second gain fibre before, the convergent point of the pump light be located at second gain fibre
Incident end face after so that the signal light enters the fibre core, the pump light enters first covering
To be amplified to the signal light in fibre core；The optical fiber output structure be used for the amplified signal light of the second gain fibre into
Row output.
Optionally, the amplification optical path includes first order optical amplification unit and second level optical amplification unit；The first order
Optical amplification unit is first kind optical amplification unit, and the second level optical amplification unit is the second class optical amplification unit；From described
The signal light of the optical circulator outgoing of level-one optical amplification unit is projected to the second wavelength-division of the second level optical amplification unit
Multiplexer；Through pump light and throwing of the pump light as the second level optical amplification unit of first wavelength division multiplexer
It is incident upon second wavelength division multiplexer.
It optionally, further include the second reflecting mirror；Light of second reflecting mirror between adjacent two-stage optical amplification unit
On the road；Second reflecting mirror be used to reflect the signal light that the transmission of the optical circulator of first order optical amplification unit comes so that
It is obtained to be projected on second wavelength division multiplexer.
Optionally, the amplification optical path includes first order optical amplification unit and second level optical amplification unit；The first order
Optical amplification unit is the second class optical amplification unit, and the second level optical amplification unit is first kind optical amplification unit；
It is multiple that the signal light being emitted from the optical fiber output structure of the first order optical amplification unit is projected to first wavelength-division
Use device；Through pump light and projection of the pump light as the second level optical amplification unit of second wavelength division multiplexer
To first wavelength division multiplexer.
Optionally, the fiber amplifier further includes the connection component being set between adjacent two-stage optical amplification unit；Institute
State connection component include third transmission fiber and be set to the third transmission fiber input terminal the second single mode collimator,
It is set to the third single mode collimator of the output end of the third transmission fiber；The second single mode collimator is used for previous stage
The signal light collimation of the optical fiber output structure output of optical amplification unit, which enters in third transmission fiber, to be transmitted, and by described
Third single mode collimator is projected in next stage optical amplification unit after collimating to it.
Optionally, the wavelength division multiplexer in each optical amplification unit includes functional surfaces；The functional surfaces and incident signal
Light and pump light are projected to the signal light of the functional surfaces and pump light is mutually perpendicular at 45 degree；The functional surfaces are used for
The same level pump light is used as after reflecting at least part of pump light, and allow after the signal light transmission with the same level pump light
Beam is closed to be projected on subsequent optical path device.
The embodiment of the present invention provides a kind of fiber amplifier, including the first gain fibre collimator and gain fibre, passes through
Signal light can be projected in the fibre core of gain fibre by the first gain fibre collimator, and pump light is projected to gain fibre
In first covering, without being realized as is conventional using the process of fused biconical taper, so as to simplify technique
Process reduces product size.Further, the signal light propagated in the fibre core of the first gain fibre and in the first gain fibre
The first covering in the pump light propagated reflected by fiber bragg grating after backtracking, in the first gain fibre of same
Middle realization is amplified twice, to reduce optical component, realizes the miniaturization of fiber amplifier.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of fiber amplifier provided in an embodiment of the present invention；
Fig. 2 is the schematic illustration that signal light provided in an embodiment of the present invention and pump light are incident to gain fibre；
Fig. 3 is the structural schematic diagram of gain fibre provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of wavelength division multiplexer provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of fiber amplifier provided in an embodiment of the present invention, and Fig. 2 mentions for the embodiment of the present invention
The signal light and pump light of confession are incident to the schematic illustration of gain fibre, and Fig. 3 is gain fibre provided in an embodiment of the present invention
Structural schematic diagram, with reference to Fig. 1, Fig. 2 and Fig. 3, fiber amplifier include seed source 1, the first single mode collimator 2, pumping source 5,
Multimode collimator 6 and amplification optical path.Seed source 1 emits signal light.First single mode collimator 2 by the first transmission fiber 261 with
Seed source 1 connects, and the signal light for coming to the transmission of the first transmission fiber 261 is emitted in amplification optical path after collimating.Pump
Pu source 5 emits pump light, and pump light has the wavelength different from signal light.Multimode collimator 6 by the second transmission fiber 262 with
Pumping source 5 connects, and the pump light for coming to the transmission of the second transmission fiber 262 is projected in amplification optical path after collimating.It puts
Big optical path includes at least one level optical amplification unit F.Optical amplification unit F includes at least first kind optical amplification unit F1.First kind light
Amplifying unit F1 include the first wavelength division multiplexer 4, optical circulator 7, the first gain fibre collimator 8, the first gain fibre 9 and
Fiber bragg grating 10.Wherein, optical circulator 7 is between the first wavelength division multiplexer 4 and the first gain fibre collimator 8,
First gain fibre 9 is between the first gain fibre collimator 8 and fiber bragg grating 10.First gain fibre 9 includes
Fibre core G1 and the first covering G2 and the second covering G3 being successively coated on outside fibre core G1.First wavelength division multiplexer 4 (for pair
Pump light carries out being used as the same level pump light after at least partly reflecting, and allows after signal light transmission to synthesize the with the same level pump light
One light beam is projected to the first gain fibre collimator 8.First gain fibre collimator 8 for being converged to the first light beam so that
Signal light convergent point be located at the incident end face of the first gain fibre 9 before, the convergent point of pump light be located at the first gain light
After the incident end face of fibre 9, so that signal light enters fibre core G1, pump light enters the first covering G2 to fibre core G1
Interior signal light amplifies.The signal light and pump light of each layer conduction are by optical fiber Bragg light in the first gain fibre 9
Backtracking after grid 10 reflect, so that signal light passes through the amplification of the first gain fibre 9 twice, and goes out from optical circulator 7
It penetrates.
The embodiment of the present invention provides a kind of fiber amplifier, including the first gain fibre collimator and gain fibre, passes through
Signal light can be projected in the fibre core of gain fibre by the first gain fibre collimator, and pump light is projected to gain fibre
In first covering, without being realized as is conventional using the process of fused biconical taper, so as to simplify technique
Process reduces product size.Further, the signal light propagated in the fibre core of the first gain fibre and in the first gain fibre
The first covering in the pump light propagated reflected by fiber bragg grating after backtracking, in the first gain fibre of same
Middle realization is amplified twice, to reduce optical component, realizes the miniaturization of fiber amplifier.
Optionally, with reference to Fig. 1 and Fig. 2, in the present embodiment, first kind optical amplification unit F1 is as first order light amplification list
First F.Signal light is projected to wavelength division multiplexer W (namely the first kind light of first order optical amplification unit F by the first single mode collimator 2
The first wavelength division multiplexer 4 of amplifying unit F1) when have the first hot spot.Pump light is projected to first order light by multimode collimator 6
There is the second hot spot, the first hot spot is less than the second hot spot when the wavelength division multiplexer W of amplifying unit F.
For clarity, signal light is marked with " L1 ", pump light is marked with " L2 ".With reference to Fig. 1 and
Fig. 2, the first gain fibre collimator 8 spy different using the convergent point position that single mode signal light L1 and multimode pump light L2 is formed
Multimode pump light L2 can be projected in the first covering G2 by point, and single mode signal light L1 is projected in fibre core G1.Due to
One hot spot is less than the second hot spot, and the facula area that the first hot spot is formed by the convergence of the first gain fibre collimator 8 is less than second
The facula area that hot spot is formed by the convergence of the first gain fibre collimator 8.Signal light L1 converges the convergent point to be formed and first
The distance between gain fibre collimator 8 be less than pump light L2 converge the convergent point to be formed and the first gain fibre collimator 8 it
Between distance.The incident end face of first gain fibre 9 is located at the convergence that signal light is formed by the convergence of the first gain fibre collimator 8
Between the convergent point that point and pump light are formed by the convergence of the first gain fibre collimator 8.First gain fibre collimator 8 is by signal
Light L1 is converged before the incident end face of the first gain fibre 9, and the signal light L1 continuation after convergence is propagated forward, and enters fibre
In core G1.For pump light L2, pump light L2 converge the convergent point to be formed the first gain fibre 9 incident end face it
Afterwards, therefore the first gain fibre collimator 8 converges pump light L2 when being projected to the incident end face of the first gain fibre 9 not
Convergence completely has biggish facula area, so as to enter in fibre core G1 and the first covering G2.Since fibre core G1 is opposite
Area is smaller for first covering G2, therefore pump light L2 only has small part that can enter in fibre core G1, the big portion of pump light L2
Branch enters in the first covering G2.
Optionally, with reference to Fig. 1, fiber amplifier further includes the first reflecting mirror 19.First reflecting mirror 19 is set to multimode standard
Between straight device 6 and the first order optical amplification unit F of fiber amplifier, to be reflected pump light so that pump light is projected to puts
In big optical path.In other embodiments, the first reflecting mirror 19 can also be set to the first single mode collimator 2 and fiber amplifier
First order optical amplification unit F between, to be reflected signal light so that signal light be projected to amplification optical path in.It is understood that
, in other embodiments, it can also be not provided with the first reflecting mirror 19, by the signal after the first single mode collimator 2 collimation
Pump light after light and multimode collimator 6 collimate directly is projected in amplification optical path.
Illustratively, with reference to Fig. 1, collimation of the signal light that seed source 1 emits Jing Guo the first single mode collimator 2 becomes parallel
Light, directional light project on the first wavelength division multiplexer 4, and project optical circulator 7 and first after penetrating the first wavelength division multiplexer 4
Gain fibre collimator 8.The optical axis direction of multimode collimator 6 can be parallel with the optical axis direction of the first single mode collimator 2.Pumping
The pump light that source 5 emits projects multimode collimator 6, and the collimation Jing Guo multimode collimator 6 becomes directional light, parallel light projection
The first wavelength division multiplexer 4 is reflexed to the first reflecting mirror 19 and by the first reflecting mirror 19, is then reflected by the first wavelength division multiplexer 4
To optical circulator 7 and the first gain fibre collimator 8.
Optionally, with reference to Fig. 1, fiber amplifier further includes being set to the first single mode collimator 2 and first order light amplification list
The first isolator 3 between first F.First isolator 3 is used to ensure that the light in optical path to carry out one way propagation, avoids reflection that from may drawing
The interference risen protects device from coming from the possible retrodirective reflection of lower section, and the light in optical path is inhibited to return to light source side.Wherein,
Lower section refers to along the light direction of propagation by the light path part after the device.
Illustratively, with reference to Fig. 1, the first isolator 3 is between the first single mode collimator 2 and the first wavelength division multiplexer 4.
Such as first light that prevents the first wavelength division multiplexer 4 to reflect towards the first single mode collimator 2 of isolator 3.First isolator 3 is adopted
It is as small as possible with free space type isolator size.
Fig. 4 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention, and with reference to Fig. 3 and Fig. 4, light is put
Big unit further includes the second class optical amplification unit F2.Second class optical amplification unit F2 increases including the second wavelength division multiplexer 11, second
Beneficial optical fiber collimator 12, the second gain fibre 13 and optical fiber output structure.Wherein, the second gain fibre 13 and the first gain light
Fine 9 structures having the same, the first covering G2 and the second covering G3 including fibre core G1 and being successively coated on outside fibre core G1.
Second wavelength division multiplexer 11 is used to carry out pump light to be used as the same level pump light after at least partly reflecting, and allows signal light transmission
The second light beam is synthesized with the same level pump light afterwards and is projected to the second gain fibre collimator 12.Second gain fibre collimator 12 is used
In the second light beam is converged so that the convergent point of signal light be located at the incident end face of the second gain fibre 13 before, pumping
The convergent point of light is located at after the incident end face of the second gain fibre 13, so that signal light enters fibre core G1, pump light
The first covering G2 is entered to amplify to the signal light in fibre core G1.Optical fiber output structure is used for the second gain fibre 13
Amplified signal light is exported.Optionally, with reference to Fig. 4, signal light is projected to the second wave of the second class optical amplification unit F2
Division multiplexer 11 has third hot spot.Pump light has when being projected to the second wavelength division multiplexer 11 of the second class optical amplification unit F2
4th hot spot, third hot spot is less than the 4th hot spot.
Optionally, with reference to Fig. 4, amplifying optical path includes first order optical amplification unit and second level optical amplification unit.The first order
Optical amplification unit is first kind optical amplification unit F1, and second level optical amplification unit is the second class optical amplification unit F2.From the first order
The signal light that the optical circulator 7 of optical amplification unit is emitted is projected to the second wavelength division multiplexer 11 of second level optical amplification unit.Thoroughly
The pump light of the first wavelength division multiplexer 4 is crossed as the pump light of second level optical amplification unit and is projected to the second wavelength division multiplexer
11。
Illustratively, with reference to Fig. 4, the signal light that seed source 1 emits is collimated by the first transmission fiber 261, the first single mode
The first wavelength division multiplexer 4 is projected to after device 2 and the first isolator 3, the pump light that pumping source 5 emits passes through the second transmission fiber
262, it is penetrated after multimode collimator 6 and the first reflecting mirror 19 and is projected to the first wavelength division multiplexer 4, through the first wavelength division multiplexer 4
Signal light and optical circulator 7, the first gain fibre collimator are projected to after pumping combiner that the first wavelength division multiplexer 4 reflects
8 and first gain fibre 9, backtracking after then being reflected by fiber bragg grating 10, signal light and pump light again pass by
First gain fibre 9 is projected to optical circulator 7 after the signal light amplified twice is by the first gain fibre collimator 8 collimation,
And the second wavelength division multiplexer 11 of second level optical amplification unit is projected to by optical circulator 7.Through the pump of the first wavelength division multiplexer 4
Pu light is also projected to the second wavelength division multiplexer 11 of second level optical amplification unit.Through the second wavelength division multiplexer 11 signal light and
The second gain fibre collimator 12, the second gain fibre 13 are projected to after pumping combiner that second wavelength division multiplexer 11 reflects
With third gain fibre collimator 14.
Optionally, with reference to Fig. 4, fiber amplifier further includes the second reflecting mirror 20.Second reflecting mirror 20 is located at adjacent two-stage
In optical path between optical amplification unit F.What the second reflecting mirror 20 was used to carry out the transmission of optical circulator 7 of first order optical amplification unit
Signal light is reflected so that it is projected on the second wavelength division multiplexer 11.
It optionally, further include that third gain fibre collimator 14, second is isolated with reference to Fig. 4, the second class optical amplification unit F2
Device 15, the first optical splitter 16 and the first detector 17.Third gain fibre collimator 14 is in the second class optical amplification unit F2
Optical fiber output structure, third gain fibre collimator 14 are located at the exit end of the second gain fibre 13, are used for the second gain light
It is exported after the signal light collimation of 13 outgoing of fibre.First optical splitter 16 is located at third gain fibre collimator 14 far from the second gain light
The outgoing end face side of fibre 13, for separating a branch of detection light from signal light to the first detector 17.First detector 17 is used
It is detected in the detection light, to determine the intensity of the reflected light in optical path, avoids damaging upper section device due to reflected light
Phenomenon occurs, and while avoiding reflected light too strong has an impact the optical path of forward-propagating.Wherein, upper section refers to propagating along light
Side is up to the light path part before the device.
Fig. 5 is that the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention amplifies optical path with reference to Fig. 5
Including first order optical amplification unit and second level optical amplification unit.First order optical amplification unit is the second class optical amplification unit F2,
Second level optical amplification unit is first kind optical amplification unit F1.The letter being emitted from the optical fiber output structure of first order optical amplification unit
Number light projection is to the first wavelength division multiplexer 4.Through the second wavelength division multiplexer 11 pump light as second level optical amplification unit
Pump light is simultaneously projected to the first wavelength division multiplexer 4.
Illustratively, with reference to Fig. 5, the signal light that seed source 1 emits is collimated by the first transmission fiber 261, the first single mode
The second wavelength division multiplexer 11 is projected to after device 2 and the first isolator 3, the pump light that pumping source 5 emits passes through the second transmission fiber
262, it is penetrated after multimode collimator 6 and the first reflecting mirror 19 and is projected to the second wavelength division multiplexer 11, through the second wavelength division multiplexer 11
Signal light and be projected to the second gain fibre collimator 12, second after pumping combiner that the second wavelength division multiplexer 11 reflects
Second level light is projected to after gain fibre 13, third gain fibre collimator 14, the second isolator 15 and the first optical splitter 16 to put
First wavelength division multiplexer 4 of big unit.Second level optical amplification unit is also projected to through the pump light of the second wavelength division multiplexer 11
The first wavelength division multiplexer 4.Signal light through the first wavelength division multiplexer 4 and the pump light reflected by the first wavelength division multiplexer 4
It is projected to optical circulator 7, the first gain fibre collimator 8 and the first gain fibre 9 after closing beam, then by fiber bragg grating
Backtracking after 10 reflections, signal light and pump light again pass by the first gain fibre 9, by the signal light that amplifies twice by the
It is projected to optical circulator 7 after one gain fibre collimator 8 collimation, and is emitted and is exported by optical circulator 7.
Optionally, with reference to Fig. 5, fiber amplifier further includes the connection group being set between adjacent two-stage optical amplification unit
Part.Connection component include third transmission fiber 263 and be set to third transmission fiber 263 input terminal the second single mode collimation
Device 18, be set to third transmission fiber 263 output end third single mode collimator 21.Second single mode collimator 18 for will before
The signal light collimation of the optical fiber output structure output of level-one optical amplification unit F, which enters in third transmission fiber 263, to be transmitted, and
It is projected to after being collimated by third single mode collimator 21 to it in next stage optical amplification unit F.
Fig. 6 is that the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention amplifies optical path with reference to Fig. 6
Including first order optical amplification unit and second level optical amplification unit.First order optical amplification unit and second level optical amplification unit are
First kind optical amplification unit F1.The signal light being emitted from the optical circulator 7 of first order optical amplification unit is projected to second level light and puts
First wavelength division multiplexer 4 of big unit.Through first order optical amplification unit the first wavelength division multiplexer 4 pump light as second
The pump light of grade optical amplification unit and the first wavelength division multiplexer 4 for being projected to second level optical amplification unit.It should be noted that
In other embodiments, fiber amplifier can also be including at least three-level optical amplification unit, as long as the light amplification of fiber amplifier
It include at least one second class optical amplification unit F2 in unit, the embodiment of the present invention does not do the quantity of optical amplification unit
It limits.
Optionally, with reference to Fig. 1, Fig. 4, Fig. 5 and Fig. 6, fiber amplifier can also include terminal single mode collimator H1 and end
It holds transmission fiber H2, terminal single mode collimator H1 to be located between terminal transmission optical fiber H2 and amplification optical path, is used for afterbody
The signal light of optical amplification unit output is collimated and is projected in terminal transmission optical fiber H2.
Fig. 7 is the structural schematic diagram of wavelength division multiplexer provided in an embodiment of the present invention, with reference to Fig. 1, Fig. 4, Fig. 5, Fig. 6 and figure
Wavelength division multiplexer W in 7, each optical amplification unit F includes functional surfaces W1.Functional surfaces W1 and incident signal light and pump light are equal
At 45 degree, and it is projected to the signal light of functional surfaces W1 and pump light is mutually perpendicular to.Functional surfaces W1 is used for at least part of pumping
Light reflected after as the same level pump light, and allow to be projected to subsequent optical path with the same level pumping photosynthesis beam after signal light transmission
On device.
It optionally, further include the first face S1, the second face S2, third face S3 and fourth face S4 with reference to Fig. 7, wavelength division multiplexer W,
First face S1 is opposite with third face S3, and the second face S2 is opposite with fourth face S4, and the first face S1 and the second face S2 are located at functional surfaces W1
The same side.Functional surfaces W1 to the second face S2 is all penetrated by the signal light of fourth face S4 incidence, by the pump of the first face S1 incidence
Pu light at least partly reflexes to the second face S2 by functional surfaces W1.Note that described completely by referring to ideal feelings in the present invention
Under condition, the diaphragm of high transmittance can be used for example in actual products.
Optionally, since the calorific value of seed source 1 and pumping source 5 is higher, it is therefore desirable to carry out temperature control, for example use
Semiconductor cooler controls its temperature, to prevent temperature fluctuation from impacting to wavelength, it is ensured that seed source 1 and pumping source
5 temperature is constant, and then ensures to issue the optical signal that the wavelength penetrated is target wavelength.
Optionally, fiber amplifier further includes adjustable attenuator (not shown), and adjustable attenuator is set to signal light
In the optical path of process, it is adjusted for the output power to signal light.Adjustable attenuator for example can be set signal light most
The output end face side of the terminal transmission optical fiber H2 of whole outgoing.
Optionally, the optical fiber in various embodiments of the present invention (such as first gain fibre 9 and the first transmission fiber 261 etc.) can
To be disposed as polarization maintaining optical fibre, each optical device (such as first wavelength division multiplexer 4 and the first gain fibre collimator 8 etc.) is then set
It is set to polarization-maintaining optical device, so that each component all has same polarization state, so that optical energy loss is smaller.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts, be combined with each other and substitutes without departing from protection scope of the present invention.Therefore, although by above embodiments to this
Invention is described in further detail, but the present invention is not limited to the above embodiments only, is not departing from present inventive concept
In the case of, it can also include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of fiber amplifier characterized by comprising
Seed source emits signal light；
First single mode collimator is connect by the first transmission fiber with the seed source, for passing to first transmission fiber
Defeated next signal light is emitted in amplification optical path after being collimated；
Pumping source emits pump light；The pump light has the wavelength different from the signal light；
Multimode collimator is connect by the second transmission fiber with the pumping source, for transmitting to second transmission fiber
Pump light collimated after be projected in the amplification optical path；And
The amplification optical path；The amplification optical path includes at least one level optical amplification unit；The optical amplification unit includes at least the
A kind of optical amplification unit；
The first kind optical amplification unit includes the first wavelength division multiplexer, optical circulator, the first gain fibre collimator, the first increasing
Beneficial optical fiber and fiber bragg grating；Wherein, the optical circulator is located at first wavelength division multiplexer and described first and increases
Between beneficial optical fiber collimator, first gain fibre is located at the first gain fibre collimator and the optical fiber Bragg light
Between grid；First gain fibre includes fibre core and the first covering being successively coated on outside the fibre core and second wraps
Layer；First wavelength division multiplexer is used to carry out the pump light to be used as the same level pump light after at least partly reflecting, and allows
The first light beam, which is synthesized, with the same level pump light after the signal light transmission is projected to the first gain fibre collimator；Described
One gain fibre collimator is used to converge first light beam so that the convergent point of the signal light is located at described the
Before the incident end face of one gain fibre, the convergent point of the pump light be located at first gain fibre incident end face it
Afterwards, so that the signal light enters the fibre core, the pump light enters first covering in fibre core
Signal light amplifies；The signal light and the pump light of each layer conduction are by the light in first gain fibre
Backtracking after fine Bragg grating reflection, so that the signal light passes through the amplification of first gain fibre twice,
And it is emitted from the optical circulator.
2. fiber amplifier according to claim 1, which is characterized in that the first single mode collimator is by the signal light
There is the first hot spot when being projected to the wavelength division multiplexer of first order optical amplification unit；The multimode collimator throws the pump light
There is the second hot spot when being incident upon the wavelength division multiplexer of first order optical amplification unit；First hot spot is less than second hot spot.
3. fiber amplifier according to claim 1, which is characterized in that further include the first reflecting mirror；First reflection
Mirror is set between the first single mode collimator and the first order optical amplification unit of the fiber amplifier, to the signal
Light is reflected so that the signal light is projected in the amplification optical path；
Alternatively, first reflecting mirror is set to the first order optical amplification unit of the multimode collimator and the fiber amplifier
Between, to be reflected the pump light so that the pump light is projected in the amplification optical path.
4. fiber amplifier according to claim 1, which is characterized in that further include being set to the first single mode collimator
The first isolator between first order optical amplification unit.
5. fiber amplifier according to claim 1, which is characterized in that the optical amplification unit further includes that the second class light is put
Big unit；
The second class optical amplification unit include the second wavelength division multiplexer, the second gain fibre collimator, the second gain fibre with
And optical fiber output structure；Wherein, second gain fibre include fibre core and be successively coated on outside the fibre core first
Covering and the second covering；Second wavelength division multiplexer is used to carry out the pump light to pump after at least partly reflecting as the same level
Pu light, and allow after the signal light transmission to synthesize the second light beam with the same level pump light to be projected to second gain fibre quasi-
Straight device；The second gain fibre collimator is for being converged the convergent point so that the signal light to second light beam
Before the incident end face of second gain fibre, the convergent point of the pump light be located at entering for second gain fibre
It penetrates after end face, so that the signal light enters the fibre core, the pump light enters first covering with right
Signal light in fibre core amplifies；The optical fiber output structure is used to carry out the amplified signal light of the second gain fibre defeated
Out.
6. fiber amplifier according to claim 5, which is characterized in that the amplification optical path includes first order light amplification list
Member and second level optical amplification unit；The first order optical amplification unit is first kind optical amplification unit, the second level light amplification
Unit is the second class optical amplification unit；The signal light being emitted from the optical circulator of the first order optical amplification unit is projected to
Second wavelength division multiplexer of the second level optical amplification unit；Through first wavelength division multiplexer the pump light as institute
It states the pump light of second level optical amplification unit and is projected to second wavelength division multiplexer.
7. fiber amplifier according to claim 6, which is characterized in that further include the second reflecting mirror；Second reflection
Mirror is in the optical path between adjacent two-stage optical amplification unit；Second reflecting mirror is used for the light to first order optical amplification unit
The signal light that circulator transmission comes is reflected so that it is projected on second wavelength division multiplexer.
8. fiber amplifier according to claim 5, which is characterized in that the amplification optical path includes first order light amplification list
Member and second level optical amplification unit；The first order optical amplification unit is the second class optical amplification unit, the second level light amplification
Unit is first kind optical amplification unit；
The signal light being emitted from the optical fiber output structure of the first order optical amplification unit is projected to first wavelength division multiplexer；
Through second wavelength division multiplexer the pump light as the second level optical amplification unit pump light and be projected to institute
State the first wavelength division multiplexer.
9. fiber amplifier according to claim 1, which is characterized in that the fiber amplifier further include be set to it is adjacent
Connection component between two-stage optical amplification unit；The connection component includes third transmission fiber and is set to the third and passes
Lose the third single mode collimation of the second single mode collimator of fine input terminal, the output end for being set to the third transmission fiber
Device；The second single mode collimator, which is used to collimate the signal light of the optical fiber output structure output of previous stage optical amplification unit, to be entered
It is transmitted in third transmission fiber, and is projected to next stage light after collimating by the third single mode collimator to it and puts
In big unit.
10. any fiber amplifier according to claim 1~9, which is characterized in that the wavelength-division in each optical amplification unit is multiple
It include functional surfaces with device；The functional surfaces and incident signal light and pump light are projected to the functional surfaces at 45 degree
Signal light and pump light be mutually perpendicular to；The functional surfaces after reflecting at least part of pump light as the same level for pumping
Pu light, and be projected on subsequent optical path device after allowing the signal light transmission with the same level pumping combiner.
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| CN201910700020.2A CN110380325A (en) | 2019-07-31 | 2019-07-31 | A kind of fiber amplifier |
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| CN201910700020.2A CN110380325A (en) | 2019-07-31 | 2019-07-31 | A kind of fiber amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783091A (en) * | 2021-09-10 | 2021-12-10 | 国神光电科技（上海）有限公司 | Optical fiber isolator |
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| JPH10200181A (en) * | 1997-01-10 | 1998-07-31 | Furukawa Electric Co Ltd:The | Optical module for amplification |
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Application publication date: 20191025 |