CN106207721A - Light source line width compressibility step by step - Google Patents
Light source line width compressibility step by step Download PDFInfo
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- CN106207721A CN106207721A CN201610657220.0A CN201610657220A CN106207721A CN 106207721 A CN106207721 A CN 106207721A CN 201610657220 A CN201610657220 A CN 201610657220A CN 106207721 A CN106207721 A CN 106207721A
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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
- H01S3/06754—Fibre amplifiers
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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Abstract
The present invention provides a kind of Light source line width compressibility step by step, the generation light source of light source generation gain apparatus give the first optical fiber as incident light transmission using light source in its narrow linewidth light source generator；The live width of incident illumination is compressed by the first optical fiber based on Rayleigh scattering effect, to obtain incident positive direction and the Rayleigh scattering signal of incident in the reverse direction, for the Rayleigh scattering signal in transmission to the incident positive direction of the first wave filter, part output, another part is reflected back the first optical fiber, the Rayleigh scattering signal that first optical fiber will be reflected back toward, is transferred to light source generation gain apparatus together with the Rayleigh scattering signal of incident in the reverse direction and carries out gain amplification；Rayleigh scattering signal after gain amplification gives the first optical fiber as incident light transmission, so that the first optical fiber is circulated compression to the live width of incident illumination, until light source is all exported by the first wave filter, this part light source finally exported is narrow linewidth light source, recompresses.Present configuration is simple, volume is little and cost is relatively low.
Description
Technical field
The invention belongs to light source generator field, be specifically related to a kind of Light source line width compressibility step by step.
Background technology
The single longitudinal mode laser bundle of super-narrow line width is a kind of high-quality light source with extremely low phase noise and overlength coherence length,
In the fields such as the first Fibre Optical Sensor, the first fiber optic communication, laser radar, distributed petroleum pipeline detection, there is wide application
Prospect.The method of the single longitudinal mode laser bundle currently forming super-narrow line width is varied, such as short cavity method, saturated absorbing body, multi-ring
The methods such as annular chamber, but laser instrument based on preceding method exists mostly, and structure is complicated, volume is bigger, with high costs, live width pressure
The defect that contracting effect is undesirable, this greatly limits the application of single longitudinal mode laser bundle of super-narrow line width.
Summary of the invention
The present invention provides a kind of Light source line width compressibility step by step, to solve to produce at present Light source line width compressibility step by step
The problem that structure is complicated, volume is bigger, relatively costly and linewidth compression is undesirable.
First aspect according to embodiments of the present invention, it is provided that a kind of Light source line width compressibility step by step, including narrow linewidth light
Source generating means and line width compression device, wherein said narrow linewidth light source generator include light source generation gain apparatus, first
Optical fiber, the first wave filter, described light source generation gain apparatus be used for producing light source and using described light source as incident light transmission to
Described first optical fiber；
Described first optical fiber is for being compressed the live width of described incident illumination based on Rayleigh scattering effect, to obtain live width
Incident positive direction after compression and the Rayleigh scattering signal of incident in the reverse direction, for described in transmission to described first wave filter
Rayleigh scattering signal in incident positive direction, a part gone out by described first filter transfer, and another part is by described first
Filter reflection returns described first optical fiber, and the Rayleigh scattering signal that described first optical fiber will be reflected back, together with described incidence
The Rayleigh scattering signal of in the reverse direction is transferred to described light source generation gain apparatus and carries out gain amplification；
Rayleigh scattering signal after gain is amplified is transferred to described first optical fiber as incident illumination, so that described first light
The fine live width to described incident illumination is circulated compression, until the light source of described predetermined amount is all transmitted by described first wave filter
Going out, this part light source being finally transferred out is the narrow linewidth light source of described narrow linewidth light source generator output, should
After narrow linewidth light source is transferred to described line width compression device, by described line width compression device based on Brillouin scattering effect and auspicious
The live width of the light source that it receives is done compression further by profit scattering effect.
In the optional implementation of one, described narrow linewidth light source generator also includes the second wave filter, described light
Source occurs gain apparatus for the light source of described predetermined amount is transferred to described second wave filter, described input as input light source
A part for light source is as incident illumination by described second filter transfer to described first optical fiber, and another part is filtered by described second
Ripple device is reflected back described light source generation gain apparatus and carries out gain amplification, and this part light source after gain amplification is as input light source
It is transferred to described second wave filter.
In the optional implementation of another kind, the Rayleigh that described first optical fiber will be returned by described first filter reflection
Scattered signal, is transferred to described second wave filter together with the Rayleigh scattering signal in described incident positive direction；
A part for the Rayleigh scattering signal that described second wave filter is received is reflected to described as incident illumination
One optical fiber, another part transmission to described light source generation gain apparatus carries out gain amplification, this part Rayleigh after gain amplification
Scattered signal is transferred to described second wave filter as input light source.
In the optional implementation of another kind, described light source generation gain apparatus is the gain media in laser instrument.
In the optional implementation of another kind, described second wave filter is the grating in laser instrument.
In the optional implementation of another kind, described laser instrument uses single longitudinal mode laser.
In the optional implementation of another kind, described first wave filter and described second wave filter transmissive and reflection
Wave-length coverage covers the wave-length coverage of light source produced by described light source generation gain apparatus.
In the optional implementation of another kind, by the material of described first optical fiber and length, and described first
Wave filter, the absorbance of described second wave filter and reflectance are designed, and obtain optimum narrow linewidth light source.
In the optional implementation of another kind, described line width compression device includes first annular device, the second circulator, partially
Shake controller, the second optical fiber, the 3rd optical fiber and the 3rd wave filter, and wherein said narrow linewidth light source passes through described first annular device quilt
Being transferred to described second optical fiber, described second optical fiber produces Brillouin scattering based on Brillouin scattering effect, and this Brillouin dissipates
Penetrate optical transport return described first annular device and be transferred to described Polarization Controller, described Polarization Controller by described first annular device
Being transferred to described second circulator after described Brillouin scattering is carried out polarization manipulation, described second circulator is by described background of cloth
Deep pool scattered light gives described 3rd optical fiber as incident light transmission；
Described 3rd optical fiber produces Rayleigh scattering light based on Rayleigh scattering effect, for being transferred to described 3rd wave filter
Rayleigh scattering light in incident positive direction, a part gone out by described 3rd filter transfer, and another part is by described 3rd filter
Ripple device is reflected back described 3rd optical fiber, and the Rayleigh scattering light that described 3rd optical fiber will reflect back into, together with described incident opposite direction
On Rayleigh scattering light be transferred to described second optical fiber by described second circulator.
In the optional implementation of another kind, between described first wave filter and described line width compression device, it is provided with light
Power amplifier.
The invention has the beneficial effects as follows:
1, the present invention uses the predetermined amount light that light source generation gain apparatus is produced by the first optical fiber based on Rayleigh scattering effect
The live width in source is compressed, and makes the first wave filter have the characteristic of transmission and transmitting, on the one hand can ensure that light source is transmitted
On the other hand go out, can ensure that the part Rayleigh scattering in the incident positive direction that the first optical fiber produces based on Rayleigh scattering effect
Signal is reflected back toward the first optical fiber, so that carry out the Rayleigh of gain amplification to light source generation gain apparatus along the first fiber-optic transfer
Scattered signal increases, and thereby may be ensured that more light source carries out live width circulation compression again after being amplified by gain, it is achieved narrow linewidth
Light source exports, owing to device involved in the present invention is less, therefore compared to the letter of current Light source line width compressibility structure step by step
List, small volume, cost are relatively low, and linewidth compression is preferable；
2, the present invention is by increasing by the second wave filter between light source generation gain apparatus and the first optical fiber, and makes the second filter
Ripple utensil has the characteristic of transmission and reflection, while can amplifying ensureing normal linewidth compression and gain, improves linewidth compression
The efficiency amplified with gain；
3, the present invention by use the gain media in laser instrument as light source generation gain apparatus, in using laser instrument
Grating, as the second wave filter, can simplify structure further, reduces volume and reduce cost；
4, by the present invention in that the wave-length coverage of the first wave filter and the second wave filter transmissive and reflection covers light source and sends out
The wave-length coverage of light source produced by raw gain apparatus, it is ensured that light source realizes in the first wave filter and the second wave filter thoroughly
Penetrate and reflect；
5, the present invention is by the material of described first optical fiber and length, and described first wave filter, described second filter
Absorbance and the reflectance of ripple device are designed, it is possible to obtain optimum narrow linewidth light source；
6, the present invention passes sequentially through first annular device, Polarization Controller and the second circulator by the second optical fiber based on narrow linewidth
The Brillouin scattering that light source produces is transferred to the 3rd optical fiber, and the 3rd optical fiber can be made to dissipate Brillouin based on Rayleigh scattering effect
The live width penetrating light is compressed；The Rayleigh scattering in incident positive direction produced based on Rayleigh scattering effect for the 3rd optical fiber
Light, is transmitted to the 3rd wave filter, by the present invention in that the 3rd wave filter has the characteristic of transmission and transmitting, the most permissible
Ensure that light source is transferred out, on the other hand can ensure that the Rayleigh scattering light in incident positive direction is transmitted along the 3rd optical fiber
To the second circulator, then by the second circulator, the Rayleigh scattering light in incident opposite direction and incident positive direction is transferred to the second light
Fibre, thus on the second optical fiber, the luminous flux of output light source increases, and stimulated Brillouin scattering effect strengthens, so that output light source
Linewidth compression efficiency improve；It addition, the present invention by being transferred to the second annular by the Brillouin scattering on the second optical fiber
Before device, use Polarization Controller that Brillouin scattering is carried out polarization manipulation, compression accuracy can be improved further；
7, the light source that narrow linewidth light source generator exports is supplied to line width compression device by the present invention, even if so increasing
The length of big second optical fiber, it is also ensured that line width compression device output single longitudinal mode laser, and can ensure that line width compression device
Stable output power, final output linewidth is the light source of Hz magnitude；
8, the present invention is by being provided with power amplifier between the first wave filter and line width compression device, can be to the
The narrow linewidth light source of one wave filter output carries out power amplification, such that it is able to be further ensured that line width compression device exports single longitudinal mode
Laser, and can ensure that the stable output power of line width compression device, final output linewidth are the light source of Hz magnitude.
Accompanying drawing explanation
Fig. 1 is an example structure schematic diagram of Light source line width of the present invention compressibility step by step；
Fig. 2 is another example structure schematic diagram of Light source line width of the present invention compressibility step by step；
Fig. 3 is another example structure schematic diagram of Light source line width of the present invention compressibility step by step.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in the embodiment of the present invention, and make the present invention real
Execute the above-mentioned purpose of example, feature and advantage can become apparent from understandable, below in conjunction with the accompanying drawings to technical side in the embodiment of the present invention
Case is described in further detail.
In describing the invention, unless otherwise prescribed and limit, it should be noted that term " connects " should do broad sense manage
Solve, for example, it may be mechanically connected or electrical connection, it is also possible to be the connection of two element internals, can be to be joined directly together, it is possible to
To be indirectly connected to by intermediary, for the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term.
Studying discovery through applicant, optical fiber, when there is Rayleigh scattering effect, is possible not only to produce in all directions auspicious
Profit scattered signal, but also the live width of the incident illumination being incident to optical fiber can be compressed.It is to say, when optical fiber occurs auspicious
During profit scattering effect, after receiving incident illumination, believe based on the Rayleigh scattering in all directions produced by Rayleigh scattering effect
Number live width all by the live width less than incident illumination.Based on this, the embodiment of the present invention proposes and carries out based on Rayleigh scattering effect
A kind of light source generator of linewidth compression, it can realize the output of narrow linewidth light source.It addition, the present invention is obtaining narrow linewidth light
Behind source, Brillouin scattering effect based on optical fiber and Rayleigh scattering effect the live width of this narrow linewidth light source can be done pressure further
Contracting, thus realize the compression step by step of Light source line width.
See Fig. 1, for an example structure schematic diagram of Light source line width of the present invention compressibility step by step.This Light source line width
Compressibility can include narrow linewidth light source generator 100 and line width compression device 200 step by step, and wherein narrow linewidth light source occurs
Device 100 can include light source generation gain apparatus the 110, first optical fiber 120 and the first wave filter 130, and light source generation gain fills
Put 110 to be connected with the first wave filter 130 by the first optical fiber 120, and the first wave filter 130 is connected with line width compression device 200.
In the present embodiment, produce within the extremely short unit interval (in such as 10 seconds) with light source generation gain apparatus 110
As a example by light source amount, the light source of this luminous flux size can be given the first light as incident light transmission by light source generation gain apparatus 110
Fine 120, after receiving incident illumination, there is Rayleigh scattering effect in the first optical fiber 120, and based on Rayleigh scattering effect to incident illumination
Live width be compressed, so that the live width of the Rayleigh scattering signal in all directions produced by Rayleigh scattering effect is all narrower than
The live width of incident illumination.Wherein, for the Rayleigh scattering signal in the incident positive direction after linewidth compression, it can be along the first light
Fine 120 are transferred to the first wave filter 130.First wave filter 130 has the characteristic of transmission and reflection, therefore in incident positive direction
A part of Rayleigh scattering signal transferred out by the first wave filter 130, another part Rayleigh scattering signal is by the first wave filter
130 are reflected back the first optical fiber 120.Hereafter, the Rayleigh scattering signal that the first optical fiber 120 will be reflected back, together with incident negative side
Rayleigh scattering signal upwards is transferred to light source generation gain apparatus 110 and carries out gain amplification (such as light intensity amplification).Gain is put
Rayleigh scattering signal after great can give the first optical fiber as incident light transmission again.
Incident illumination, after receiving incident illumination, can be processed by the first optical fiber 120 according to above-mentioned identical mode, from
And the live width of the light source that light source generation gain apparatus 110 produces is circulated compression, until light source generation gain apparatus 110 exists
The light source produced in unit interval is all transferred out by the first wave filter 130.Due to each linewidth compression process, all can there is portion
Light splitting source is transferred out by the first wave filter 130, therefore when light source is all transferred out by the first wave filter 130, represents whole
Individual live width circulation compression process terminates.Non-owing to being transferred to, from light source, the time that the first optical fiber all transferred out to light source
The shortest (i.e. the unit interval is extremely short), and the intensity of this part light source finally exported in whole live width circulation compression process is far away
More than the intensity of the light source exported before, therefore this part light source of last output can be considered as whole live width circulation compression process
The light source of middle output, the i.e. light source of this light source generator output.Due to each live width in whole live width circulation compression process
Compression process, the live width of this part light source finally exported all experienced by, and therefore the live width of this part light source of last output obtains
To greatly compressing, i.e. the live width of the light source of this light source generator output has obtained greatly compressing, so that this light source
Generating means 100 exports narrow linewidth light source.Owing to the unit interval is extremely short, narrow linewidth light source generator therefore can be considered as permissible
Stably output narrow linewidth light source.After output narrow linewidth light source, it can be exported to line width compression device 200, then by live width
The live width of the light source that it receives, based on Brillouin scattering effect and Rayleigh scattering effect, is done pressure further by compressor 200
Contracting, thus obtain super-narrow line width light source.
As seen from the above-described embodiment, the present invention uses the first optical fiber based on Rayleigh scattering effect to light source generation gain apparatus
The live width of the predetermined amount light source produced is compressed, and makes the first wave filter have the characteristic of transmission and transmitting, the most permissible
On the other hand ensure that light source is transferred out, can ensure that in the incident positive direction that the first optical fiber produces based on Rayleigh scattering effect
Part Rayleigh scattering signal be reflected back toward the first optical fiber, so that carrying out along the first fiber-optic transfer to light source generation gain apparatus
The Rayleigh scattering signal that gain is amplified increases, and thereby may be ensured that more light source carries out live width circulation pressure again after being amplified by gain
Contracting, it is achieved narrow linewidth light source exports, and owing to device involved in the present invention is less, therefore presses step by step compared to current Light source line width
Compression system simple in construction, small volume, cost are relatively low, and linewidth compression is preferable.It addition, the present invention is by using linewidth compression to fill
Put, based on Brillouin scattering effect and Rayleigh scattering effect, narrow linewidth light source is done compression further, can reduce defeated further
Go out the live width of light source.
See Fig. 2, for another example structure schematic diagram of Light source line width of the present invention compressibility step by step.Fig. 2 and Fig. 1
The difference of shown Light source line width compressibility step by step is, this narrow linewidth light source generator 100 can also include the second filtering
Device 140, wherein this light source generation gain apparatus 110 can pass sequentially through second wave filter the 140, first optical fiber 120 and connects first
Wave filter 130.
In the present embodiment, similarly, with light source generation gain apparatus 110 within the extremely short unit interval (in such as 10 seconds)
As a example by the light source amount produced, light source generation gain apparatus 110 can be using the light source of this luminous flux size as input light source transmission
To the second wave filter 140.Second wave filter 140 has the characteristic of transmission and reflection, is therefore transferred to the defeated of the second wave filter 140
Entering light source, a part is transmitted to the first optical fiber 120 by the second wave filter 140 as incident illumination, and another part is reflected back toward light source
Occurring gain apparatus 110 to carry out gain amplification, this part light source after gain is amplified can be re-transmitted to as input light source
Second wave filter 140.
First optical fiber 120, after receiving incident illumination, can occur Rayleigh scattering effect, it is possible to imitates based on Rayleigh scattering
The live width of reply incident illumination is compressed, so that the Rayleigh scattering signal in all directions produced by Rayleigh scattering effect
Live width is all narrower than the live width of incident illumination.For the Rayleigh scattering signal in the incident positive direction after linewidth compression, it can be along
First optical fiber 120 is transferred to the first wave filter 130.Owing to the first wave filter 130 has the function of transmission and reflection, therefore enter
The part penetrating the Rayleigh scattering signal in positive direction can be transferred out by the first wave filter 130, and another part can be by
One wave filter 130 is reflected back the first optical fiber 120.Hereafter, the Rayleigh that the first optical fiber 120 will be reflected by the first wave filter 130
Scattered signal, together with the Rayleigh scattering signal of its incident in the reverse direction produced based on Rayleigh scattering effect, is transferred to the second filter
Ripple device 140.Hereafter, a part for the Rayleigh scattering signal that the second wave filter 140 can be received reflects as incident illumination
Returning the first optical fiber 120, the transmission of another carries out gain amplification to light source generation gain apparatus 110, and this part that gain is amplified is auspicious
Profit scattered signal can be re-transmitted to the second wave filter 140 as input light source.
Input light source, after receiving input light source, can be carried out by the second wave filter 140 according to above-mentioned identical mode
Process, and the first optical fiber 120 be after receiving incident illumination, it is also possible to according to above-mentioned identical mode, incident illumination is processed,
Such that it is able to the live width of the light source that light source generation gain apparatus 110 produces is circulated compression, until this luminous flux size
Light source is all transferred out by the first wave filter 130.
The present invention is by increasing by the second wave filter between light source generation gain apparatus and the first optical fiber, and makes the second filtering
Utensil has transmission and reflection characteristic, the second wave filter on the one hand can be made when receiving input light source, a part is inputted light
Source is transferred to the first optical fiber and carries out normal linewidth compression, and another part inputs source reflection light echo source occurs gain apparatus to enter
Row gain is amplified, and thus can put forward the efficiency of plus and blowup；On the other hand the second wave filter can be made to receive the first light
During the Rayleigh scattering signal that fibre transmits, a part of Rayleigh scattering signal is reflected back the first optical fiber as incident illumination, thus
Can improve the efficiency of linewidth compression, and another part Rayleigh scattering signal is transferred to light source generation gain apparatus can carry out
Normal gain is amplified.As can be seen here, the present invention is by increasing by the second filtering between light source generation gain apparatus and the first optical fiber
Device, and make the second wave filter have the characteristic of transmission and reflection, while can amplifying ensureing normal linewidth compression and gain,
Improve linewidth compression and the efficiency of gain amplification.
It addition, the difference of the compressibility step by step of Light source line width shown in Fig. 2 with Fig. 1 also resides in, line width compression device 200 is permissible
Including first annular device the 210, second circulator 220, Polarization Controller the 230, second optical fiber the 240, the 3rd optical fiber 250 and the 3rd filter
Ripple device 260, wherein in narrow linewidth light source generator 100, the outfan of the first wave filter 130 connects the of first annular device 210
Single port 1, the second port 2 of first annular device 210 connects the 3rd port 3 of the second circulator 220 by the second optical fiber 240,
3rd port 3 of first annular device 210 connects the first port 1 of the second circulator 220, the second ring by Polarization Controller 230
Second port 2 of shape device 220 connects the input of the 3rd wave filter 260 by the 3rd optical fiber 250, the 3rd wave filter 260 defeated
Go out to hold output linewidth by the light source after compressing step by step.
In the present embodiment, produce within the extremely short unit interval (in such as 10 seconds) with narrow linewidth light source generator 100
Narrow linewidth light source amount as a example by, this narrow linewidth light source is after being transferred to the first port 1 of first annular device 210, first annular
This narrow linewidth light source can be exported by device 210 from its second port 2, and is transferred to the second optical fiber 240.Second optical fiber 240 based on
Brillouin scattering effect produces Brillouin scattering and as output light source, Brillouin scattering is transmitted back to first annular device 210
The second port 2.Hereafter, this Brillouin scattering is exported by first annular device 210 from its 3rd port 3, and is transferred to polarization
Controller 230, is carried out polarization manipulation by Polarization Controller 230 to this Brillouin scattering, and by the Brillouin after polarization manipulation
Transmission of stray light gives the first port 1 of the second circulator 220.Second circulator 220, should after receiving Brillouin scattering
Brillouin scattering exports from its second port 2, and is transferred to the 3rd optical fiber 250.3rd optical fiber 250 receive Brillouin dissipate
After penetrating light, based on Rayleigh scattering effect, the live width of Brillouin scattering is compressed, thus obtains incident positive direction and incidence
The Rayleigh scattering light of in the reverse direction, wherein the Rayleigh scattering light in incident positive direction is transferred to the 3rd wave filter 260.3rd filter
Ripple device 260 has the characteristic of transmission and reflection, and therefore the Rayleigh scattering light part in incident positive direction is by the 3rd wave filter 260
Transferring out, another part Rayleigh scattering light is reflected back the 3rd optical fiber 250 by the 3rd wave filter 260.Hereafter, the 3rd optical fiber 250
The Rayleigh scattering light that can will reflect back into, together with the Rayleigh scattering optical transport of incident in the reverse direction to the second circulator 250
Second port 2.
Second circulator 250, can be defeated from its 3rd port 3 by this Rayleigh scattering light after receiving Rayleigh scattering light
Going out, and be transferred to the second optical fiber 240, now the Brillouin scattering on the second optical fiber 240 collectively forms defeated with Rayleigh scattering light
Go out light source.After receiving narrow linewidth light source due to the second optical fiber 240 produce Brillouin scattering to the second optical fiber 240 receive from
The interval time of the Rayleigh scattering light that the second circulator 220 is transmitted back to is the shortest (when this interval time is far smaller than above-mentioned unit
Between), therefore when the second optical fiber 240 receives from the Rayleigh scattering light that the second circulator 220 is transmitted back to, the second optical fiber 240 is also
Input has narrow linewidth light source.Now, the output light source on the second optical fiber 240 and narrow linewidth light source interact, and are excited cloth
In deep pool scattering effect, during stimulated Brillouin scattering effect, the live width of output light source can be compressed, and due to every time
During linewidth compression, the second circulator 220 all can be transmitted back to part Rayleigh scattering light to the second optical fiber 240, therefore every time
During linewidth compression, the luminous flux of output light source also can increase.
After the live width of output light source is compressed and luminous flux increases, can be again transferred to the of first annular device 210
Two-port netwerk 2, hereafter can be circulated compression according to above-mentioned identical mode to the live width of output light source, meanwhile Brillouin
The luminous flux of scattered light also can increase further.The narrow linewidth light source produced within this unit interval is all transferred to the second light
After fine 240, the second optical fiber 240 no longer occur stimulated Brillouin scattering effect, whole circulation compression process reach balance.Due to
After whole circulation compression process reaches balance, the luminous flux of the 3rd exportable light source of wave filter 260 is far longer than and exports before
The luminous flux of light source, after therefore whole circulation compression process can reach balance, the light source of the 3rd wave filter 260 output is made
Output light source for line width compression device.Additionally, due to the unit interval is extremely short, therefore can be considered as line width compression device can be steady
Determine the light source after output linewidth compresses step by step.
The present invention passes sequentially through first annular device, Polarization Controller and the second circulator by the second optical fiber based on narrow linewidth light
The Brillouin scattering that source produces is transferred to the 3rd optical fiber, and the 3rd optical fiber can be made Brillouin scattering based on Rayleigh scattering effect
The live width of light is compressed.The Rayleigh scattering light in incident positive direction produced based on Rayleigh scattering effect for the 3rd optical fiber,
It is transmitted to the 3rd wave filter, by the present invention in that the 3rd wave filter has the characteristic of transmission and transmitting, on the one hand can protect
Card light source is transferred out, and on the other hand can ensure that the Rayleigh scattering light in incident positive direction is transferred to along the 3rd optical fiber
Second circulator, then by the second circulator, the Rayleigh scattering light in incident opposite direction and incident positive direction is transferred to the second light
Fibre, thus on the second optical fiber, the luminous flux of output light source increases, and stimulated Brillouin scattering effect strengthens, so that output light source
Linewidth compression efficiency improve.It addition, the present invention by being transferred to the second annular by the Brillouin scattering on the second optical fiber
Before device, use Polarization Controller that Brillouin scattering is carried out polarization manipulation, compression accuracy can be improved further.First
Power amplifier 300 can be provided with, so that the first wave filter 130 to be exported between wave filter 130 and line width compression device 200
Narrow linewidth light source carry out power amplification.
As seen from the above-described embodiment, the present invention uses the first optical fiber based on Rayleigh scattering effect to light source generation gain apparatus
The live width of the predetermined amount light source produced is compressed, and makes the first wave filter have the characteristic of transmission and transmitting, the most permissible
On the other hand ensure that light source is transferred out, can ensure that in the incident positive direction that the first optical fiber produces based on Rayleigh scattering effect
Part Rayleigh scattering signal be reflected back toward the first optical fiber, so that carrying out along the first fiber-optic transfer to light source generation gain apparatus
The Rayleigh scattering signal that gain is amplified increases, and thereby may be ensured that more light source carries out live width circulation pressure again after being amplified by gain
Contracting, it is achieved narrow linewidth light source exports, and owing to device involved in the present invention is less, therefore presses step by step compared to current Light source line width
Compression system simple in construction, small volume, cost are relatively low, and linewidth compression is preferable.It addition, the present invention is by using linewidth compression to fill
Put, based on Brillouin scattering effect and Rayleigh scattering effect, narrow linewidth light source is done compression further, can reduce defeated further
Go out the live width of light source.
See Fig. 3, for another example structure schematic diagram of Light source line width of the present invention compressibility step by step.The present embodiment
In, producing as a example by single longitudinal mode laser bundle by Light source line width compressibility step by step, in Fig. 2, light source generation gain apparatus 110 can be
Gain media in laser instrument DFB (Distributed Feedback Laser, distributed feedback laser), the second wave filter
140 can be the grating in laser instrument DFB, and the first optical fiber 120 can be that scattered light is fine.Owing in laser instrument, gain media is not only
Lasing light emitter can be produced, it is also possible to realizing gain and amplify, during therefore the present invention selects laser instrument, gain media occurs as light source
Gain apparatus, can simplify structure, reduce volume and reduce cost.It addition, the present invention selects in laser instrument grating as second
Wave filter, can simplify structure further, reduce volume and reduce cost.
In the present embodiment, gain media 110 is after receiving the signal of telecommunication, and laser instrument DFB starts starting of oscillation, such that it is able to produce
Including the lasing light emitter of multiple longitudinal mode laser bundles, equal and each longitudinal mode the frequency range of the frequency range of the most each longitudinal mode is permissible
Constitute the live width of lasing light emitter.As a example by the lasing light emitter produced within the extremely short unit interval, gain media 110 can be by this luminous flux
The lasing light emitter of size is transferred to grating 140 as input light source, owing to grating 140 has the characteristic of transmission and reflection, therefore passes
Being defeated by the lasing light emitter of grating 140, a part is transferred to scatter optical fiber 120 by grating 140 as incident illumination, and another part is reflected
Returning gain media 110 and carry out gain amplification, this fraction of laser light source after gain is amplified can be transmitted again as input light source
To grating 140.
Due to when the first optical fiber particle size much smaller than incident light source wavelength (typically smaller than incident light source wavelength ten/
One), time, the first optical fiber just can occur Rayleigh scattering, therefore can be according to the characteristic of incident light source wavelength, the material to the first optical fiber
Material selects, so that it is determined that the scattering optical fiber of correspondence.After receiving incident illumination, there is Rayleigh scattering effect in scattering optical fiber 120
Should, and based on Rayleigh scattering effect, the live width of incident illumination is compressed, so that Rayleigh scattering effect each side produced
The live width of Rayleigh scattering signal upwards is all narrower than the live width of incident illumination.For the Rayleigh in the incident positive direction after linewidth compression
Scattered signal, it can be transferred to the first wave filter 130 along scattering optical fiber 120.Owing to the first wave filter 130 has transmission
With the function of reflection, therefore a part for the Rayleigh scattering signal in incident positive direction can be transmitted out by the first wave filter 130
Going, another part can be reflected back scattering optical fiber 120 by the first wave filter 130, will be by the first wave filter by scattering optical fiber 120
130 Rayleigh scattering signals reflected, together with the Rayleigh scattering of its incident in the reverse direction produced based on Rayleigh scattering effect
Signal, is transferred to grating 140.Hereafter, a part for the Rayleigh scattering signal that grating 140 can be received is as incident illumination
Being reflected back scattering optical fiber 120, the transmission of another carries out gain amplification to gain media 110, and this part Rayleigh that gain is amplified dissipates
Penetrate signal and can again be transferred to grating 140 as input light source.
Input light source, after receiving input light source, can be processed by grating 140 according to above-mentioned identical mode, and
Scattering optical fiber 120 is after receiving incident illumination, it is also possible to process incident illumination according to above-mentioned identical mode, such that it is able to
The live width of the lasing light emitter that gain media 110 produced within the unit interval is circulated compression, until this lasing light emitter is by the first filter
Ripple device 130 all transfers out.
Line width compression device 200, can after receiving the narrow linewidth light source of above-mentioned narrow linewidth light source generator output
To carry out linewidth compression in the way of identical described in Fig. 2 embodiment, such that it is able to realize single longitudinal mode laser output.Due to existing
The live width having light source generator output light source is usually MHz magnitude, if the light therefore existing light source generator exported
Source is supplied directly to the line width compression device in embodiment illustrated in fig. 2, and requires that line width compression device exports single longitudinal mode laser, then
Second optical fiber must the shortest (about below 10m), the second the shortest optical fiber would become hard to formed Brillouin scattering effect, thus
Cause line width compression device output unstable.Owing to the live width of narrow linewidth light source generator output light source in the present invention can
To reach kHz magnitude, therefore when the light source of narrow linewidth light source generator output in this patent is supplied to line width compression device
Time, even if increasing the length of the second optical fiber, it is also ensured that line width compression device output single longitudinal mode laser, and can ensure that live width
The stable output power of compressor, final output linewidth is the light source of Hz magnitude.
As seen from the above-described embodiment, the present invention uses the first optical fiber based on Rayleigh scattering effect to gain media in laser instrument
The live width of the predetermined amount lasing light emitter produced is compressed, and makes the first wave filter have the characteristic of transmission and transmitting, on the one hand can
To ensure that lasing light emitter is transferred out, on the other hand can ensure that the incident pros that the first optical fiber produces based on Rayleigh scattering effect
Part Rayleigh scattering signal upwards is reflected back toward the first optical fiber, so that carrying out gain along the first fiber-optic transfer to gain media
The Rayleigh scattering signal amplified increases, and thereby may be ensured that more lasing light emitter carries out live width circulation pressure again after being amplified by gain
Contracting, it is achieved super-narrow line width lasing light emitter export, owing to device involved in the present invention is less, therefore compared to current Light source line width by
Level compressibility simple in construction, small volume, cost are relatively low, and linewidth compression is preferable.It addition, the present invention is by using live width pressure
Compression apparatus, does compression further based on Brillouin scattering effect and Rayleigh scattering effect to narrow linewidth light source, can subtract further
The live width of little output light source.
It is to be noted that in order to ensure that light source can realize transmission with anti-in the first wave filter and the second wave filter
Penetrating, the wave-length coverage of above-mentioned first wave filter and the second wave filter transmissive and reflection should cover light source generation gain apparatus
The wave-length coverage of light source produced by (i.e. laser instrument).It addition, it has been investigated that, the Rayleigh that the first optical fiber produces based on incident illumination
The power of scattered signal is determined by the first fiber optic materials and the first fiber lengths, therefore to produce optimum narrow linewidth light source,
Need the first wave filter and the absorbance of the second wave filter and reflectance, and the first fiber optic materials and the first fiber lengths enter
Row research.Ruili scattered light is applicable not only to single longitudinal mode laser bundle to the compression of laser beam, is also applied for other mode
Laser beam, but owing to single longitudinal mode laser bundle has wider array of using value, the most preferably, described laser instrument uses single longitudinal mode to swash
Light device.Preferably, described laser instrument uses single longitudinal mode Distributed Feedback Laser.
Those skilled in the art, after considering description and putting into practice invention disclosed herein, will readily occur to its of the present invention
Its embodiment.The application is intended to any modification, purposes or the adaptations of the present invention, these modification, purposes or
Person's adaptations is followed the general principle of the present invention and includes the undocumented common knowledge in the art of the present invention
Or conventional techniques means.Description and embodiments is considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the invention is not limited in precision architecture described above and illustrated in the accompanying drawings, and
And various modifications and changes can carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (10)
1. a Light source line width compressibility step by step, it is characterised in that include narrow linewidth light source generator and linewidth compression dress
Putting, wherein said narrow linewidth light source generator includes light source generation gain apparatus, the first optical fiber, the first wave filter, described light
Source occur gain apparatus be used for producing light source and using described light source as incident light transmission to described first optical fiber；
Described first optical fiber is for being compressed the live width of described incident illumination based on Rayleigh scattering effect, to obtain linewidth compression
After incident positive direction and the Rayleigh scattering signal of incident in the reverse direction, for the described incidence of transmission to described first wave filter
Rayleigh scattering signal in positive direction, a part gone out by described first filter transfer, another part is filtered by described first
Device is reflected back described first optical fiber, and the Rayleigh scattering signal that described first optical fiber will be reflected back, together with described incident negative side
Rayleigh scattering signal upwards is transferred to described light source generation gain apparatus and carries out gain amplification；
Rayleigh scattering signal after gain is amplified is transferred to described first optical fiber as incident illumination, so that described first optical fiber pair
The live width of described incident illumination is circulated compression, until the light source of described predetermined amount is all transmitted out by described first wave filter
Going, this part light source being finally transferred out is the narrow linewidth light source of described narrow linewidth light source generator output, and this is narrow
After live width light source is transferred to described line width compression device, by described line width compression device based on Brillouin scattering effect and Rayleigh
The live width of the light source that it receives is done compression further by scattering effect.
Light source line width the most according to claim 1 compressibility step by step, it is characterised in that described narrow linewidth light source fills
Putting and also include the second wave filter, described light source generation gain apparatus is for transmitting the light source of described predetermined amount as input light source
To described second wave filter, a part for described input light source as incident illumination by described second filter transfer to described first
Optical fiber, another part is returned described light source generation gain apparatus by described second filter reflection and carries out gain amplification, and gain is amplified
After this part light source as input light source be transferred to described second wave filter.
Light source line width the most according to claim 2 compressibility step by step, it is characterised in that described first optical fiber will be described
The Rayleigh scattering signal that first filter reflection is returned, is transferred to described together with the Rayleigh scattering signal in described incident positive direction
Second wave filter；
A part for the Rayleigh scattering signal that described second wave filter is received is reflected to described first light as incident illumination
Fibre, another part transmission to described light source generation gain apparatus carries out gain amplification, this part Rayleigh scattering after gain amplification
Signal is transferred to described second wave filter as input light source.
Light source line width the most according to claim 1 compressibility step by step, it is characterised in that described light source generation gain apparatus
For the gain media in laser instrument.
Light source line width the most according to claim 2 compressibility step by step, it is characterised in that described second wave filter is laser
Grating in device.
6. according to the compressibility step by step of the Light source line width described in claim 4 or 5, it is characterised in that described laser instrument uses single
Longitudinal-mode laser.
Light source line width the most according to claim 2 compressibility step by step, it is characterised in that described first wave filter and described
The wave-length coverage of the second wave filter transmissive and reflection covers the wavelength model of light source produced by described light source generation gain apparatus
Enclose.
8. want the compressibility step by step of the Light source line width described in 1 according to right, it is characterised in that by the material to described first optical fiber
Expect and length, and described first wave filter, the absorbance of described second wave filter and reflectance are designed, and obtain optimum
Narrow linewidth light source.
Light source line width the most according to claim 1 compressibility step by step, it is characterised in that described line width compression device includes
First annular device, the second circulator, Polarization Controller, the second optical fiber, the 3rd optical fiber and the 3rd wave filter, wherein said narrow linewidth
Light source is transferred to described second optical fiber by described first annular device, and described second optical fiber produces based on Brillouin scattering effect
Brillouin scattering, this Brillouin scattering be transmitted back to described first annular device and by described first annular device be transferred to described partially
Shake controller, and described Polarization Controller is transferred to described second circulator after described Brillouin scattering is carried out polarization manipulation,
Described Brillouin scattering is given described 3rd optical fiber as incident light transmission by described second circulator；
Described 3rd optical fiber produces Rayleigh scattering light based on Rayleigh scattering effect, for the incidence being transferred to described 3rd wave filter
Rayleigh scattering light in positive direction, a part gone out by described 3rd filter transfer, another part is by described 3rd wave filter
Being reflected back described 3rd optical fiber, the Rayleigh scattering light that described 3rd optical fiber will reflect back into, together with described incident in the reverse direction
Rayleigh scattering light is transferred to described second optical fiber by described second circulator.
Light source line width the most according to claim 1 compressibility step by step, it is characterised in that described first wave filter and institute
State and between line width compression device, be provided with power amplifier.
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| CN107238991A (en) * | 2017-05-17 | 2017-10-10 | 上海大学 | A kind of modulating system and method based on stimulated Brillouin scattering gain spectra |
| WO2021017355A1 (en) * | 2019-07-29 | 2021-02-04 | 武汉电信器件有限公司 | Optical signal outputting device, method, and storage medium |
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| US20050094129A1 (en) * | 2003-10-29 | 2005-05-05 | Macdougall Trevor | Combined Bragg grating wavelength interrogator and brillouin backscattering measuring instrument |
| CN105244739A (en) * | 2015-10-22 | 2016-01-13 | 重庆大学 | Ultra-narrow linewidth optical fiber laser |
| CN105356290A (en) * | 2015-12-16 | 2016-02-24 | 重庆大学 | Ultra-narrow line width optical fiber laser device based on Rayleigh scattering and stimulated brillouin scattering |
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| EP0042521A2 (en) * | 1980-06-23 | 1981-12-30 | Hughes Aircraft Company | Method and apparatus for laser pulse compression |
| US20050094129A1 (en) * | 2003-10-29 | 2005-05-05 | Macdougall Trevor | Combined Bragg grating wavelength interrogator and brillouin backscattering measuring instrument |
| CN105244739A (en) * | 2015-10-22 | 2016-01-13 | 重庆大学 | Ultra-narrow linewidth optical fiber laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107238991A (en) * | 2017-05-17 | 2017-10-10 | 上海大学 | A kind of modulating system and method based on stimulated Brillouin scattering gain spectra |
| CN107238991B (en) * | 2017-05-17 | 2019-10-11 | 上海大学 | A kind of modulating system and method based on stimulated Brillouin scattering gain spectra |
| WO2021017355A1 (en) * | 2019-07-29 | 2021-02-04 | 武汉电信器件有限公司 | Optical signal outputting device, method, and storage medium |
| US11942996B2 (en) | 2019-07-29 | 2024-03-26 | Wuhan Telecommunication Devices Co., Ltd. | Optical signal outputting device, method, and storage medium |
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