CN106532415A - Inclined grating-based stimulated Raman scattering effect suppression type optical fiber laser - Google Patents
Inclined grating-based stimulated Raman scattering effect suppression type optical fiber laser Download PDFInfo
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- CN106532415A CN106532415A CN201610806747.5A CN201610806747A CN106532415A CN 106532415 A CN106532415 A CN 106532415A CN 201610806747 A CN201610806747 A CN 201610806747A CN 106532415 A CN106532415 A CN 106532415A
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- optical fiber
- gain fibre
- raman scattering
- stimulated raman
- fiber laser
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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
-
- 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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The present invention belongs to the optical fiber communication technical field and relates to an inclined grating-based stimulated Raman scattering effect suppression type optical fiber laser. The inclined grating-based stimulated Raman scattering effect suppression type optical fiber laser comprises a pump source, a gain optical fiber, a pump coupling device, a reflection assembly and an inclined grating structure; the pump source is used for outputting pump light; the pump coupling device is connected with the pump source and the gain optical fiber and is used for coupling the pump light into the gain optical fiber; the reflection assembly is connected with the gain optical fiber and is used for reflecting and coupling pump light outputted by the gain optical fiber to the gain optical fiber; and the inclined grating structure is connected with the gain optical fiber and is used for attenuating the energy of stimulated Raman scattered waves of which the wavelengths exceed a threshold wavelength. According to the inclined grating-based stimulated Raman scattering effect suppression type optical fiber laser provided by the present invention, stimulated Raman scattering effect suppression and excellent equipment performance can be both considered.
Description
Technical field
The present invention relates to optical fiber cable communication technical field, more particularly to a kind of stimulated Raman scattering effect based on oblique raster
Answer suppressive optical fiber laser.
Background technology
Silica fibre has nonlinear effect, when high power density optical signal is transmitted in a fiber, fiber optic materials folding
Penetrate rate to be modulated by high power light intensity so as to be no longer linear medium characteristic, produce new gains different from flashlight and
Frequency component, and have influence on normal signal transmission through fiber.In current existing single mode or multimode high-capacity optical fiber laser
In all affected by different degrees of stimulated raman scattering SRS so as to can produce different from laser instrument own wavelength
New wavelength component, causes the deterioration of laser instrument monochromaticjty and performance, so can all take measures in general superpower laser
Suppress SRS, improve laser performance.
In prior art, the main method for suppressing SRS in optical fiber laser is to adopt large core fiber, is reduced as far as possible
Optical Fiber Transmission length, or apply the mode of many pumping sources, skill level is complex, and which has for key technology and technique
Stronger impact, its performance are somewhat limited；It is simultaneously narrower using object range.
The content of the invention
The present invention provides a kind of stimulated raman scattering suppressive optical fiber laser based on oblique raster, solves existing
In technology, suppress optical fiber laser measure complicated, limited performance high to technological requirement, the technical problem of applicable object narrow range.
For solving above-mentioned technical problem, the invention provides a kind of stimulated raman scattering based on oblique raster suppresses
Type optical fiber laser, including：
Pumping source, for exporting pump light；
Gain fibre；
Pump coupling device, is connected with the pumping source and the gain fibre, for the coupling pump light is entered
The gain fibre；
Reflection subassembly, is connected with the gain fibre, and the pump light reflection coupling that gain fibre is exported is entered the gain
Optical fiber；
Oblique raster structure, is connected with the gain fibre, exceeds the stimulated Raman scattering ripple of threshold wave-length for loss
Energy.
Further, the oblique raster structure includes：Inclined optical fiber grating；
The inclined optical fiber grating welding is in described gain fibre one end.
Further, the oblique raster structure includes：The oblique raster being scribed in the gain fibre.
Further, the reflection subassembly includes：Total reflection fiber grating and part reflection fiber grating；
Input of the total reflection fiber grating welding in the gain fibre, the part reflection fiber grating welding
In the gain fibre output end.
Further, the pump coupling device includes：First coupler and the second coupler；
First coupler is connected between the total reflection fiber grating and the gain fibre input；
Second coupler is connected between the part reflection fiber grating and the gain fibre output end；
First coupler and second coupler are connected with the pumping source respectively.
Further, the optical fiber laser also includes：Isolator；
The isolator is connected with the input of the pump coupling device, for suppressing the reflection in Transmission Fibers to believe
Number.
Further, the optical fiber laser also includes：Circulator；
The circulator first end is connected with the gain fibre output end, the second end of the circulator and the reflection group
Part is connected；The 3rd end of the circulator is connected with the pump coupling device；
Wherein, the pump light of the gain fibre output is input into via the first end of the circulator, by the reflection group
Part reflects, and enters the pump coupling device from the 3rd end.
Further, the optical fiber laser also includes：Isolator；
The isolator is connected with the output end of the gain fibre, for suppressing the reflected signal in Transmission Fibers.
One or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage：
The stimulated raman scattering suppressive optical fiber laser based on oblique raster provided in the embodiment of the present application, leads to
Setting oblique raster structure is crossed, specific aim screening is carried out for pump energy and initial signal light energy, that is, SRS threshold values are set
Condition：By below specific wavelength light screening be reflected in chamber, realize positive feedback, realize gain add up, final output swash
Optical signal；By specific wavelength with upper ripple when the oblique raster structure or device, due to Wavelength matched, transmit in its fibre core
Basic mode energy can cause its loss to improve, so that no longer meeting the threshold condition of SRS, realize SRS's with covering mode coupling
Suppress, reach output pure as far as possible under specific wavelength；Suppress and equipment performance so as to take into account SRS.On the other hand, equipment room
It is seamlessly connected, without changing material and the structure of itself, realizes most on the basis of the performance for ensureing original laser instrument
The SRS of big degree suppresses；By many kinds of parameters of oblique raster, such as grating length, modulation period, modulation depth, inclination angle, warble
Deng adjustability cause to tackle the SRS situations under various lasers in theory, realize farthest ensureing laser beam
With suppress SRS on the premise of power output, and be adapted to all kinds of optical fiber lasers；Simultaneously can also be by for oblique light
The structural parameters of fine grating are modulated and the output characteristics of change optical fiber laser, such as polarization characteristic etc., can meet all types of light
Fibre laser demand.
Description of the drawings
Fig. 1 is the stimulated raman scattering suppressive optical-fiber laser based on oblique raster that the embodiment of the present invention one is provided
The structural representation of device；
Fig. 2 is the stimulated raman scattering suppressive optical-fiber laser based on oblique raster that the embodiment of the present invention two is provided
The structural representation of device；
Fig. 3 is the stimulated raman scattering suppressive optical-fiber laser based on oblique raster that the embodiment of the present invention three is provided
The structural representation of device；
Fig. 4 is the stimulated raman scattering suppressive optical-fiber laser based on oblique raster that the embodiment of the present invention four is provided
The structural representation of device；
Fig. 5 is the inclination angle of optical fiber laser provided in an embodiment of the present invention for transmiting general OptiGrating emulation knot
Really；
Fig. 6 is the cycle of optical fiber laser provided in an embodiment of the present invention for transmiting general OptiGrating emulation knot
Really；
Fig. 7 is the length of optical fiber laser provided in an embodiment of the present invention for transmiting general OptiGrating emulation knot
Really.
Specific embodiment
The embodiment of the present application is by providing the stimulated raman scattering suppressive optical fiber laser based on oblique raster, solution
Certainly in prior art, suppress optical fiber laser measure complicated, limited performance high to technological requirement, the skill of applicable object narrow range
Art problem；Suppression stimulated raman scattering has been reached, the technique effect of the performance of laser instrument has been improved.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application skill
The detailed description of art scheme, rather than the restriction to technical scheme, in the case where not conflicting, the embodiment of the present application
And the technical characteristic in embodiment can be mutually combined.
Four kinds of specific structure implementations are proposed below for laser structure.
Embodiment one
Referring to Fig. 1, a kind of stimulated raman scattering suppressive light based on oblique raster provided in an embodiment of the present invention
Fibre laser, including：
Pumping source, for exporting pump light；
Gain fibre 1；
Pump coupling device (3,4), is connected with the pumping source and the gain fibre 1, for by the pumping optocoupler
Close into the gain fibre 1.
Reflection subassembly (5,6), is connected with the gain fibre 1, and the pump light reflection coupling that gain fibre 1 is exported enters institute
State gain fibre 1.
Oblique raster structure 2, is connected with the gain fibre 1, exceeds the stimulated Raman scattering of threshold wave-length for loss
The energy of ripple.
Specifically, the oblique raster structure includes：Inclined optical fiber grating；The inclined optical fiber grating welding is described
Gain fibre one end.
The reflection subassembly includes：Total reflection fiber grating 5 and part reflection fiber grating 6；The total reflection optical fiber light
Input of 5 welding of grid in the gain fibre 1,6 welding of part reflection fiber grating are exported in the gain fibre 1
End.
The pump coupling device includes：First coupler 3 and the second coupler 4；First coupler 3 is connected to institute
State between total reflection 1 input of fiber grating 5 and the gain fibre.
Second coupler 4 is connected between 1 output end of the part reflection fiber grating 6 and the gain fibre.
First coupler 3 and second coupler 4 are connected with the pumping source respectively.
Further, the optical fiber laser also includes：Isolator 7；The isolator 7 and the pump coupling device
Input is connected, for suppressing the reflected signal in Transmission Fibers.
Embodiment two
Referring to Fig. 2, the present embodiment is, on the basis of embodiment one, to make for the version of the oblique raster 2
Second scheme.
Specifically, the oblique raster structure includes：The oblique raster being scribed in the gain fibre.
Other structures are repeated no more
Above-mentioned two embodiment is chamber shape optical fiber laser, below based on the realization of the annular photosensitiveness laser instrument of oblique raster
Scheme.
Embodiment three
Referring to Fig. 3, a kind of stimulated raman scattering suppressive light based on oblique raster provided in an embodiment of the present invention
Fibre laser, including：
Pumping source, for exporting pump light；
Gain fibre；
Pump coupling device, is connected with the pumping source and the gain fibre, for the coupling pump light is entered
The gain fibre.
Reflection subassembly, is connected with the gain fibre, and the pump light reflection coupling that gain fibre is exported is entered the gain
Optical fiber.
Oblique raster structure, is connected with the gain fibre, exceeds the stimulated Raman scattering ripple of threshold wave-length for loss
Energy.
Specifically, the oblique raster structure includes：Inclined optical fiber grating；The inclined optical fiber grating welding is described
Gain fibre one end.
The optical fiber laser also includes：Circulator；
The circulator first end is connected with the gain fibre output end, the second end of the circulator and the reflection group
Part is connected；The 3rd end of the circulator is connected with the pump coupling device；
Wherein, the pump light of the gain fibre output is input into via the first end of the circulator, by the reflection group
Part reflects, and enters the pump coupling device from the 3rd end.
Further, the optical fiber laser also includes：Isolator；
The isolator is connected with the output end of the gain fibre, for suppressing the reflected signal in Transmission Fibers.
Example IV
Referring to Fig. 4, the present embodiment is, on the basis of embodiment three, to make for the version of the oblique raster
Two kinds of schemes.
Specifically, the oblique raster structure includes：The oblique raster being scribed in the gain fibre.
The course of work is introduced below specifically.
The explanation as a example by swashing Raman scattering wavelength 1114nm as specific wavelength.
Pumping source, 976nm LD outputs：There is provided stimulated radiation energy in Yb dosed optical fiber so as to produce stimulated radiation.
Yb dosed optical fiber：Stimulated radiation gain media, there is provided the gain effect needed for laser output.
Isolator：Reflected signal in suppression Transmission Fibers, it is ensured that laser instrument exports quality.
Optical fiber bragg grating FBG：Reflex is played to the wave band centered on the bragg wavelength of FBG only, its commplementary wave length rises
To filtering effect.
Coupler：Extraneous optical signal is coupled into into laser instrument, or laser signal coupling in laser instrument is exported.
Oblique raster TFBG structures：Loss effect is played to stimulated Raman scattering wavelength, by having controlled inclination angle and grating
The parameters such as cycle so as to only Raman wavelength 1114nm is acted on, by the LP01 mould couplings under stimulated Raman scattering wavelength 1114nm
Close and be lost in fibre cladding, realize suppressing the effect of stimulated raman scattering SRS.
Referring to Fig. 5, Fig. 6 and Fig. 7, for the TFGB of wavelength centered on 1.55um wavelength, its inclination angle, the cycle, and
Length is for the OptiGrating simulation results of transmission spectrum.
From the point of view of according to simulation result, can be according to the length of its TFBG, inclination angle, screen periods are controlling which for which matches
Transmission loss under wavelength.
Simultaneously during SRS effects under in the face of big wave-length coverage, can also be warbled by introducing to oblique raster structure and
Apodization effect, realizes for the matching effect of SRS wavelength, reaches farthest suppression.
For mixing as a example by stimulated raman scattering suppressive optical fiber laser of the ytterbium based on oblique raster, Yi Zhongli
TFBG structural parameters by feasible suppression SRS wavelength are following (also various structures can be designed)：
Cladding radius：62.5um, fiber core radius：3.375um, grating length：2cm, refractive index modulation depth：0.0005
Stimulated raman scattering suppressive optical-fiber laser of the ytterbium based on oblique raster is mixed based on what TFBG suppression SRS were acted on
The workflow of device following (considering that Yb dosed optical fiber length Yb-fiber is fixed)：
Specifically
When pump energy and relatively low initial signal light energy (not up to SRS threshold conditions)：
When in the pump light injection laser of 976nm, 976nm optical signals cause ytterbium ion in optical fiber in Yb dosed optical fiber
(Yb3+) the generation excited energy level transition radiation of medium energy level, light source of the centre wavelength for 1060nm is produced, when through FBG structure,
The light screening of 1060nm wavelength is reflected in chamber, positive feedback is realized, is realized that gain adds up, is finally exported at half-reflecting mirror end
The laser signal of 1060nm；
When pump energy and higher initial signal light energy, when needing to realize high-power output, (SRS threshold value bars are reached
Part)
The laser energy of 1060nm is normally exported, and the wavelength of produced stimulated Raman scattering 1114nm is due to passing through
When TFBG structures or device, due to Wavelength matched, the basic mode energy transmitted in its fibre core can cause which to damage with covering mode coupling
Consumption is improved, so that no longer meeting the threshold condition of SRS, is realized the suppression of SRS, is reached pure as far as possible under 1060nm wavelength
It is net to export；
By the use of inclined optical fiber grating as individually suppressing optical fiber laser SRS devices, using simple and convenient, can be direct
Using the method for welding, it would however also be possible to employ the method scribed；Itself characteristic for optical fibre device, can be by changing its structure
Parameter (inclination angle, screen periods etc.), theory make to can apply to any optical fiber laser thereon that (single mode, multimode, difference are mixed
Heteroion) among, and the performance for having influence on laser instrument itself of minimum level；
Light can be adapted to by the structural parameters (grid face inclination angle, grating constant are warbled) of regulation oblique raster effectively
The change of fibre laser and extraneous demand (such as polarization characteristic etc.), have very strong scalability and robustness.
One or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage：
The stimulated raman scattering suppressive optical fiber laser based on oblique raster provided in the embodiment of the present application, leads to
Setting oblique raster structure is crossed, specific aim screening is carried out for pump energy and initial signal light energy, that is, SRS threshold values are set
Condition：By below specific wavelength light screening be reflected in chamber, realize positive feedback, realize gain add up, final output swash
Optical signal；By specific wavelength with upper ripple when the oblique raster structure or device, due to Wavelength matched, transmit in its fibre core
Basic mode energy can cause its loss to improve, so that no longer meeting the threshold condition of SRS, realize SRS's with covering mode coupling
Suppress, reach output pure as far as possible under specific wavelength；Suppress and equipment performance so as to take into account SRS.On the other hand, equipment room
It is seamlessly connected, without changing material and the structure of itself, realizes most on the basis of the performance for ensureing original laser instrument
The SRS of big degree suppresses；By many kinds of parameters of oblique raster, such as grating length, modulation period, modulation depth, inclination angle, warble
Deng adjustability cause to tackle the SRS situations under various lasers in theory, realize farthest ensureing laser beam
With suppress SRS on the premise of power output, and be adapted to all kinds of optical fiber lasers；Simultaneously can also be by for oblique light
The structural parameters of fine grating are modulated and the output characteristics of change optical fiber laser, such as polarization characteristic etc., can meet all types of light
Fibre laser demand.
It should be noted last that, above specific embodiment only to illustrate technical scheme and unrestricted,
Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, which all should be covered
In the middle of scope of the presently claimed invention.
Claims (8)
1. a kind of stimulated raman scattering suppressive optical fiber laser based on oblique raster, it is characterised in that include：
Pumping source, for exporting pump light；
Gain fibre；
Pump coupling device, is connected with the pumping source and the gain fibre, for the coupling pump light is entered described
Gain fibre；
Reflection subassembly, is connected with the gain fibre, and the pump light reflection coupling that gain fibre is exported is entered the gain fibre；
Oblique raster structure, is connected with the gain fibre, exceeds the energy of the stimulated Raman scattering ripple of threshold wave-length for loss
Amount.
2. the stimulated raman scattering suppressive optical fiber laser based on oblique raster as claimed in claim 1, its feature
It is that the oblique raster structure includes：Inclined optical fiber grating；
The inclined optical fiber grating welding is in described gain fibre one end.
3. the stimulated raman scattering suppressive optical fiber laser based on oblique raster as claimed in claim 1, its feature
It is that the oblique raster structure includes：The oblique raster being scribed in the gain fibre.
4. the stimulated raman scattering suppressive optical-fiber laser based on oblique raster as described in any one of claims 1 to 3
Device, it is characterised in that the reflection subassembly includes：Total reflection fiber grating and part reflection fiber grating；
Input of the total reflection fiber grating welding in the gain fibre, part reflection fiber grating welding is in institute
State gain fibre output end.
5. the stimulated raman scattering suppressive optical fiber laser based on oblique raster as claimed in claim 4, its feature
It is that the pump coupling device includes：First coupler and the second coupler；
First coupler is connected between the total reflection fiber grating and the gain fibre input；
Second coupler is connected between the part reflection fiber grating and the gain fibre output end；
First coupler and second coupler are connected with the pumping source respectively.
6. the stimulated raman scattering suppressive optical fiber laser based on oblique raster as claimed in claim 4, its feature
It is that the optical fiber laser also includes：Isolator；
The isolator is connected with the input of the pump coupling device, for suppressing the reflected signal in Transmission Fibers.
7. the stimulated raman scattering suppressive optical-fiber laser based on oblique raster as described in any one of claims 1 to 3
Device, it is characterised in that the optical fiber laser also includes：Circulator；
The circulator first end is connected with the gain fibre output end, the second end of the circulator and the reflection subassembly phase
Even；The 3rd end of the circulator is connected with the pump coupling device；
Wherein, the pump light of the gain fibre output is input into via the first end of the circulator, anti-by the reflection subassembly
Penetrate, the pump coupling device is entered from the 3rd end.
8. the stimulated raman scattering suppressive optical fiber laser based on oblique raster as claimed in claim 7, its feature
It is that the optical fiber laser also includes：Isolator；
The isolator is connected with the output end of the gain fibre, for suppressing the reflected signal in Transmission Fibers.
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Cited By (14)
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| CN107425400A (en) * | 2017-09-22 | 2017-12-01 | 四川思创优光科技有限公司 | Raman suppression method and system for fiber laser |
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| CN109038205A (en) * | 2018-07-10 | 2018-12-18 | 南京理工大学 | A kind of method of stimulated Raman scattering phenomenon in inhibition optical fiber laser |
| CN109149329A (en) * | 2018-08-28 | 2019-01-04 | 南京理工大学 | Stimulated Raman scattering filter production method in kilowatt level optical fiber laser |
| CN109193337A (en) * | 2018-10-29 | 2019-01-11 | 中国人民解放军国防科技大学 | Stimulated Raman scattering inhibition method for high-power optical fiber laser amplifier system |
| CN109217098A (en) * | 2018-10-29 | 2019-01-15 | 中国人民解放军国防科技大学 | Method for suppressing stimulated Raman scattering by fiber laser oscillator |
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| CN110265858A (en) * | 2019-06-19 | 2019-09-20 | 中国人民解放军国防科技大学 | High-power Raman fiber laser system for selectively exciting high-order mode |
| JP2020126935A (en) * | 2019-02-05 | 2020-08-20 | 古河電気工業株式会社 | Optical fiber laser and combined optical fiber laser |
| CN111817119A (en) * | 2020-07-20 | 2020-10-23 | 长沙大科激光科技有限公司 | Fiber laser with anti-fiber core Raman light return function |
| CN111817120A (en) * | 2020-07-20 | 2020-10-23 | 长沙大科激光科技有限公司 | Optical fiber for inhibiting stimulated Raman scattering effect and application thereof |
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| CN112886374A (en) * | 2021-01-22 | 2021-06-01 | 苏州创鑫激光科技有限公司 | Fiber laser for inhibiting stimulated Raman scattering effect and manufacturing method thereof |
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Cited By (17)
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| CN107543803A (en) * | 2017-08-22 | 2018-01-05 | 武汉理工大学 | Fiber-optic grating sensor and method for sensing based on composite grating linear array |
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