CN105717069B - Index sensor based on the DBR laser with micro groove structure - Google Patents
Index sensor based on the DBR laser with micro groove structure Download PDFInfo
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- CN105717069B CN105717069B CN201610218520.9A CN201610218520A CN105717069B CN 105717069 B CN105717069 B CN 105717069B CN 201610218520 A CN201610218520 A CN 201610218520A CN 105717069 B CN105717069 B CN 105717069B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/4133—Refractometers, e.g. differential
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- H—ELECTRICITY
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
- H01S5/125—Distributed Bragg reflector [DBR] lasers
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Abstract
The invention discloses a kind of index sensor of DBR laser and preparation method thereof based on micro groove structure, which includes pump light source, single mode optical fiber, light wavelength division multiplexing, the DBR laser with micro groove structure, isolator, Polarization Controller and light power meter；Wherein, the DBR laser with micro groove structure is connect by single mode optical fiber with light wavelength division multiplexing, and light wavelength division multiplexing passes through single mode optical fiber respectively and is connected with pump light source and isolator, and isolator is sequentially connected in series with Polarization Controller, light power meter.The characteristics of present invention is lost using different refractivity material difference caused by DBR laser shoot laser, Refractive Index of Material is measured using a kind of simple and reliable scheme, measurement accuracy has huge potential using value and vast market prospect up to 61.9dB/ unit refractive index.
Description
Technical field
The present invention relates to Design of Optical Fiber Sensor field, in particular to the folding of a kind of DBR laser based on micro groove structure
Penetrate the preparation method of the DBR laser of rate sensor and micro groove structure.
Background technique
In pursuing supermatic modern industry, sensor is essential device, and Conditional electronic sensor exists
Great function is played in the past few decades.However Conditional electronic sensor is due to measurement accuracy and cost, and is not suitable for
In all industrial environments, current sensor technology just develops towards directions such as micromation, integrated, low-power consumption, is based on light
Fine sensor provides a kind of simple and reliable scheme for people
Fibre optical sensor is divided into passive sensor and two kinds of active sensor.Optical fiber passive sensor mainly includes interference
Instrument, FP chamber, fiber grating and conical fiber etc. are several, make fiber optic interferometric arm using physical quantitys such as temperature, stress, extraneous refractive index
It is long, chamber is long, raster grid spacing or loss and effective refractive index etc. change, thus make optical fiber structure characteristic wavelength or
Energy changes, that is, generates sensing effect.Active sensor mainly uses optical fiber laser as sensing element, with normal light
Fiber sensor is compared, and active sensor has the advantages that high s/n ratio, high-output power and is easy to detect.Passive sensing is upgraded
For active sensor, signal-to-noise ratio and transmission range can be improved.In addition, if wave can be overcome by detecting to laser energy
The problem of long demodulation.Therefore, the advantages of sensor of this active laser device had not only remained passive optical fiber sensing technology, but also gram
The deficiency for having taken passive optical fiber sensing technology is succession and development to optical fiber sensing technology.
Sensor based on DBR laser is one of fiber grating active sensor, has high s/n ratio, high output
Power is easy to the advantages that detection, output linewidth narrow/wide range tuner.All the sensor based on DBR laser is done both at home and abroad
Numerous studies, at present focus primarily upon the physics such as temperature, strain and displacement to the research of the sensor based on DBR laser
Amount, the sensing of refractive index is less, this is because the structure of this short cavity laser is relatively fixed, the requirement to resonant cavity is formed
It is higher, it is difficult to process.Therefore, past seldom document mentions refractometry.Such as in document " Composite
Structure Distributed Bragg Reflector Fiber Laser for Simultaneous Two
Parameter Sensing, IEEE Photon.Tech. Lett, vol.12, pp.1464-1466 (2010) " proposes to utilize
The measurement of method the realization refractive index and temperature of inscription grating in the resonant cavity of DBR laser, however measurement sensitivity (-
3.94dB/ unit refractive index) it is not high.
Therefore, study it is a kind of it is simple and compact for structure, based on energy demodulation, easy to operate and high sensitivity DBR laser
Index sensor become a valuable project.
Summary of the invention
The shortcomings that it is a primary object of the present invention to overcome the prior art and insufficient, provides a kind of based on micro groove structure
The preparation method of the index sensor of the index sensor of DBR laser and the DBR laser based on micro groove structure, the biography
Sensor influences the property of the energy of shoot laser using different refractivity substance in the DBR laser with microflute, passes through survey
The size of amount laser energy can achieve the purpose of the size of measurement of species refractive index.This measurement method have structure it is simple,
High sensitivity, signal-to-noise ratio are strong and are easy to the advantages that demodulating.
According to disclosed embodiment, the first aspect of the present invention proposes a kind of DBR laser based on micro groove structure
Index sensor, include: pump light source, single mode optical fiber, light wavelength division multiplexing, the DBR laser with micro groove structure,
Isolator, Polarization Controller and light power meter；Wherein, the DBR laser with micro groove structure by single mode optical fiber with
Light wavelength division multiplexing connection, light wavelength division multiplexing pass through single mode optical fiber respectively and are connected with pump light source and isolator, isolator
It is sequentially connected in series with Polarization Controller, light power meter.
Further, the pump light source is the pump laser that wavelength is 980nm, and effect is the laser of 980nm
So that the laser medium erbium ytterbium ion in DBR laser is activated to the excitation state of higher energy level from ground state, is that DBR laser transmitting swashs
The necessary condition of light.
Further, the wavelength division multiplexer is 980nm/1550nm wavelength division multiplexer, and main function is to swash DBR
The light wave of light device medium wave a length of 980nm and 1550nm demultiplexes (separation).
Further, the micro groove structure in the DBR laser with micro groove structure is to be swashed with laser in DBR
The microflute of light device side processing, distinctive micro groove structure breach laser and are difficult to make extraneous sensitive limitation in optical fiber
DBR laser is contacted with test substance, incudes the variations in refractive index of test substance.
Further, the DBR laser with micro groove structure includes sensor fibre and Wavelength matched optical fiber
Grating pair, the Wavelength matched fiber grating pair are the fiber bragg grating pair in equal periods, the center of optical grating reflection
The central wavelength that wavelength is radiated with the sensor fibre matches, wherein sensor fibre is connected to a pair of Wavelength matched light
Between fine grating pair, near the main 1550nm of fiber grating pair reflection wavelength, fiber grating pair is the resonant cavity of DBR laser,
Light wave only has shakes just meeting shoot laser back and forth in resonant cavity.
Further, the sensor fibre is the erbium-ytterbium co-doped fiber containing gain media.
Further, the main function of the isolator is to enable shoot laser one-way transmission, prevents laser reflection from returning DBR
DBR laser is damaged in laser.
Further, the main function of the Polarization Controller is the polarization state for adjusting laser, makes the strong of shoot laser
Degree reaches maximum value.
Further, the main function of the light power meter is the power for measuring shoot laser.
According to disclosed embodiment, the second aspect of the present invention proposes a kind of DBR laser based on micro groove structure
Preparation method, the preparation method comprises the following steps:
S1, one section of general single mode fiber of welding is distinguished at the both ends of one section of erbium-ytterbium co-doped fiber；
S2, it is carved into Bragg grating pair in the erbium-ytterbium co-doped fiber, obtains laser cavity；
S3, using CO2Laser carries out cutting processing, the CO to the laser cavity2The high power of laser emitting
The side of laser cavity described in laser alignment, high power laser light get to the side that the huge heat generated on optical fiber enables rapidly optical fiber
Partial melting forms a smooth microflute.
Further, the step S2 specifically:
Bragg grating is carved into the erbium-ytterbium co-doped fiber using excimer laser and phase mask lithographic technique
It is right.
Further, the length of the laser cavity is 10mm.
Further, the energy that pump light is absorbed when erbium-ytterbium co-doped fiber work, gives off radiant light.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1, the invention proposes a kind of simple and compact for structure, high sensitivity based on micro groove structure DBR optical fiber laser
Index sensor, the characteristics of loss using different refractivity material difference caused by DBR laser shoot laser, realization pair
The measurement of Refractive Index of Material, refractive index sensitivity of the invention are 61.9dB/ unit refractive index.
2, the present invention is compared to traditional index sensor, has many advantages, such as that stability is good, electromagnetism interference.
3, the present invention compared with existing fiber grating refractive index sensing technology, have signal-to-noise ratio by force and be easy to demodulate etc. it is excellent
Point.
4, the invention avoids test substance is put among optical fiber structure, and sensor fibre is directly placed in test substance
Among sense, realize quick, accurate sensing, therefore there is huge application potential.
Detailed description of the invention
Fig. 1 is the structure chart with micro groove structure DBR laser；
Fig. 2 is the side view of the DBR laser with micro groove structure under an electron microscope；
Fig. 3 is a kind of structural representation of the index sensor of DBR laser based on micro groove structure proposed by the present invention
Figure；
Fig. 4 is the measurement data and matched curve that refraction index solution is carried out using index sensor of the invention.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
The present embodiment proposes a kind of index sensor of DBR laser based on micro groove structure, main to be swashed by measurement
Light device exports energy to realize the measurement to Refractive Index of Material, and basic principle is as follows: the pump light that pump light source issues passes through
Single mode optical fiber enters light wavelength division multiplexing, is entering the DBR laser (structure is as shown in Figure 1) for having micro groove structure, will have
The DBR laser of micro groove structure is placed in solution to be measured, and the energy production that solution to be measured can enable DBR laser be emitted at this time is certain
The loss of degree, is equivalent to an optical attenuator, the modulation laser that DBR laser generates again successively by light wavelength division multiplexing,
Isolator, Polarization Controller finally enter light power meter and are detected.Since the solution to be measured of different refractivity makes laser
At attenuation it is different, so that the energy of laser output output also changes correspondingly, change the refractive index of solution to be measured, count
The changed power of shoot laser is calculated, and then is inferred to the variation of test substance refractive index.
As shown in figure 3, the purpose of the present invention is realized by the following technical solution: a kind of DBR based on micro groove structure is sharp
The index sensor of light device includes: pump light source, single mode optical fiber, light wavelength division multiplexing, the DBR with micro groove structure swash
Light device, isolator, Polarization Controller and light power meter；Wherein, the DBR laser with micro groove structure passes through single-mode optics
Fibre is connect with light wavelength division multiplexing, and light wavelength division multiplexing passes through single mode optical fiber respectively and is connected with pump light source and isolator, every
It is sequentially connected in series from device and Polarization Controller, light power meter.
The pump light source is the pump laser that wavelength is 980nm.
Microflute in the DBR laser with micro groove structure is to use CO2Laser laser cavity side cut and
At the width of microflute is 5~1000 μm, and the depth of microflute is no more than the size (50~60um) of optical fiber cavity.
The DBR laser with micro groove structure, includes sensor fibre and Wavelength matched fiber grating pair,
In, sensor fibre is connected between a pair of Wavelength matched fiber grating pair.The sensor fibre is erbium-ytterbium co-doped fiber.Light
Fine grating is to being the fiber grating pair being mutually matched with sensor fibre central wavelength.
Further to examine feasibility of the invention, spy carries out following example: first taking index sensor by Fig. 3
It builds, sensor fibre is placed in sucrose solution, change the refractive index of solution by adjusting sucrose concentration, refractive index is from 1.3325
To 1.45, the raising of concentration slowly；As the different refractivity solution difference of the laser loss caused by DBR laser, Ke Yifa
Existing laser emitting power changes, the data after reading and recording the stabilization of each optical power with the raising of solution refractive index.
As shown in figure 4, solution refractive index and two groups of data of laser power are established rectangular coordinate system, sent out after Mathematical Fitting is handled
Existing, there are good linear relationships between refractive index and laser power: optical power increases with the raising of refractive index, sensitive
It spends up to 61.9dB/ unit refractive index.
The present embodiment also proposes a kind of DBR laser preparation method with micro groove structure, comprising the following steps:
(1) one section of general single mode fiber of welding, the erbium-ytterbium co-doped fiber are distinguished at the both ends of one section of erbium-ytterbium co-doped fiber
The energy that pump light is absorbed when work, gives off radiant light；
(2) cloth is carved into step (1) described erbium-ytterbium co-doped fiber using excimer laser and phase mask lithographic technique
Glug grating pair obtains the laser cavity that length is 10mm；
(3) CO is used2Laser carries out cutting processing, CO to laser cavity described in step (2)2The Gao Gong of laser emitting
The side of laser cavity described in rate laser alignment, high power laser light get to the side that the huge heat generated on optical fiber enables rapidly optical fiber
Face partial melting forms a smooth microflute, thus obtains the DBR laser with micro groove structure, as shown in Figure 2.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (4)
1. it is a kind of based on micro groove structure DBR laser index sensor, which is characterized in that including pump light source,
Single mode optical fiber, light wavelength division multiplexing, the DBR laser with micro groove structure, isolator, Polarization Controller and light power meter；Its
In, the DBR laser with micro groove structure is connect by single mode optical fiber with light wavelength division multiplexing, and the light wave point is multiple
Pass through single mode optical fiber respectively with device to be connected with the pump light source and the isolator, the isolator and described
Polarization Controller, the light power meter are sequentially connected in series；
The DBR laser with micro groove structure includes sensor fibre and Wavelength matched fiber grating pair, sensor fibre
It is connected between Wavelength matched fiber grating pair, micro groove structure is arranged on sensor fibre.
2. the index sensor according to claim 1 based on the DBR laser with micro groove structure, feature exist
In the sensor fibre uses erbium-ytterbium co-doped fiber.
3. the index sensor according to claim 1 based on the DBR laser with micro groove structure, feature exist
In the Wavelength matched fiber grating pair is the fiber bragg grating pair in equal periods, the central wavelength of optical grating reflection
The central wavelength radiated with the sensor fibre matches.
4. the index sensor according to claim 1 based on the DBR laser with micro groove structure, feature exist
In the micro groove structure in the DBR laser with micro groove structure is to use CO2Laser cuts micro- in DBR laser
Slot, groove width range are 5~1000 μm.
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| CN201610218520.9A CN105717069B (en) | 2016-04-08 | 2016-04-08 | Index sensor based on the DBR laser with micro groove structure |
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| CN201610218520.9A CN105717069B (en) | 2016-04-08 | 2016-04-08 | Index sensor based on the DBR laser with micro groove structure |
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| CN105717069B true CN105717069B (en) | 2019-02-12 |
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| CN110006846B (en) * | 2019-04-19 | 2021-11-23 | 哈尔滨工程大学 | Trace liquid refractive index measuring device of V-shaped special optical fiber and preparation method |
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| JPH0240537A (en) * | 1988-07-29 | 1990-02-09 | Nec Corp | Apparatus for measuring change in refractive index |
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| CN102353651A (en) * | 2011-07-07 | 2012-02-15 | 天津大学 | Measuring apparatus for refractive index of active photonic crystal fiber |
| CN102721665A (en) * | 2012-05-16 | 2012-10-10 | 暨南大学 | Micro nano optical fiber grating refractive index sensor |
| CN103196870A (en) * | 2013-03-14 | 2013-07-10 | 天津理工大学 | Michelson mode field interference refractive index sensor based on single-mode fiber |
| CN104407413A (en) * | 2014-11-26 | 2015-03-11 | 暨南大学 | Dumbbell-type fiber Bragg grating preparation method and temperature-insensitive reflective index sensor |
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