CN107179047B - A kind of dual interferometer based on fiber bragg grating - Google Patents
A kind of dual interferometer based on fiber bragg grating Download PDFInfo
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- CN107179047B CN107179047B CN201710292327.4A CN201710292327A CN107179047B CN 107179047 B CN107179047 B CN 107179047B CN 201710292327 A CN201710292327 A CN 201710292327A CN 107179047 B CN107179047 B CN 107179047B
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- bragg grating
- optical fiber
- single mode
- mode optical
- fiber bragg
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02015—Interferometers characterised by the beam path configuration
- G01B9/02027—Two or more interferometric channels or interferometers
Abstract
The invention discloses a kind of dual interferometers based on fiber bragg grating, comprising: single mode optical fiber fibre core is internally provided with Bragg grating, and plane where the Bragg grating is parallel to the axis of the single mode optical fiber fibre core.The present invention in single mode optical fiber core segment region by introducing periodic refractive index modulation production Bragg grating, double interference effects can be formed simultaneously, that is optical fibre Fabry-perot interference effect and Mach Zehnder interferometry effect or Fabry-Perot interference effect and Michelson interference effect.The inventive structure is simple, low in cost, has very strong practical value and good application prospect.
Description
Technical field
The invention belongs to fibre optic interferometer fields, more particularly to a kind of double interference based on fiber bragg grating
Instrument.
Background technique
Fibre optic interferometer is to utilize instrument made of interference of light principle.With small in size, light-weight, compact-sized, cost
It is low, it the advantages that anti-electromagnetic interference capability is strong, is paid more and more attention.
Currently, fibre optic interferometer is widely used to the fields such as fiber optic communication, optical fiber laser and Fibre Optical Sensor.It is existing
Fibre optic interferometer, mainly by the Additional interference device that is arranged in inside of optical fibre or based on the special construction structure of optical fiber itself
At interfered device realize interference function.But single interference device can only realize a kind of interference effect, if necessary to simultaneously
It realizes multiple interference effects, then multiple and different interfered devices is needed to connect, cause the overall structure of interferometer relative complex, body
Product is larger.
Therefore, at present there is an urgent need to develop structure out is simple, multiple interference can be realized simultaneously based on single interference device
The fibre optic interferometer of effect.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention is intended to provide a kind of be based on fiber bragg grating
Dual interferometer, had a single function or multiple functional but structure is multiple with overcoming existing interferometer or structure simply
Miscellaneous problem.
To achieve the goals above, the present invention provides a kind of dual interferometers based on fiber bragg grating, comprising: single
Mode fiber fibre core, is internally provided with Bragg grating, and plane where the Bragg grating is parallel to the single mode optical fiber fibre core
Axis so that incident light pass through the Bragg grating when occur Fabry-Perot interference effect.
Further, there is interval between the Bragg grating and two end faces of the single mode optical fiber fibre core, so that
Incident optical, can be in described Bragg grating one end and corresponding single mode optical fiber after the Bragg grating is divided into two parts
Region between the end face of fibre core is met, and Mach Zehnder interferometry effect occurs.
Further, the exit end of the Bragg grating is located on the end face of single mode optical fiber fibre core one end, so that
Incident light is after the Bragg grating is divided into two parts, in the exit end directly by the corresponding end of the single mode optical fiber fibre core
Face reflection, after two parts reflected light backtracking, in incidence end and the corresponding single mode optical fiber fibre core of the Bragg grating
Region between end face is met, and Michelson interference effect occurs.
To achieve the goals above, the present invention also provides a kind of dual interferometers based on fiber bragg grating, comprising:
Single mode optical fiber fibre core, is internally provided at least two Bragg gratings, and at least two Bragg grating is generally aligned in the same plane
On, and the plane is parallel to the axis of the single mode optical fiber fibre core, so that genetic method when incident light passes through the Bragg grating
Fabry-Perot interference effect；At least two fiber bragg gratings central wavelength having the same, cascade are arranged described
In single mode optical fiber fibre core, so as to which cascade Mach Zehnder interferometry effect occurs after incident light is divided into two parts.
In general, the above technical scheme conceived by the present invention compared with prior art, has the advantages that
(1) present invention inside single mode optical fiber fibre core only by being arranged parallel to the single optical fiber of single mode optical fiber fibre core axis
Multiple interference effects can be achieved at the same time in Bragg grating, and structure is simple.
(2) since multiple interference effects can be achieved at the same time in single fiber bragg grating of the invention, interference is simplified
The structure of instrument internal components, the cascade length of second order grating is up to 0.5mm hereinafter, small in size.
(3) present invention, which is based only upon, inscribes single optical grating construction in single mode optical fiber fibre core and realizes multiple interference effects, and existing
The fibre optic interferometer constituted in technology based on special optical fiber is compared, and cost is lower.
Detailed description of the invention
Fig. 1 is the schematic top plan view of fiber bragg grating distribution situation in single mode optical fiber fibre core in the present invention；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is based on single fiber bragg grating while to realize that Fabry-Perot interference effect and mach zhender are dry
Relate to the optical fiber dual interferometer structure of the main view of effect；
Fig. 4 is based on single fiber bragg grating while to realize Fabry-Perot interference effect and Michelson interference
The optical fiber dual interferometer structure of the main view of effect；
Fig. 5 is based on cascaded optical fiber Bragg grating while to realize Fabry-Perot interference and Mach Zehnder interferometry effect
The optical fiber dual interferometer structure of the main view answered.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Please refer to Fig. 1,2, the dual interferometer of the invention based on fiber bragg grating, comprising: single mode optical fiber fibre core,
Inside is equipped with Bragg grating, and plane where the Bragg grating is parallel to the axis of the single mode optical fiber fibre core, wherein institute
Stating Bragg grating is to cross to carry out the period in single mode optical fiber core segment region based on femtosecond laser mask plate method or by-line method
Property refractive index modulation, by-line inscription be made.By Fig. 1,2 it is found that the distribution plane of the Bragg grating is single mode optical fiber fibre core
A longitudal section, from Fig. 2 view, refractive index modulation region is only a line style area on single mode optical fiber fiber core cross section
Domain.
In the present embodiment, from Fig. 1 view, single indentation perpendicular to single mode optical fiber fibre core axis, in other realities
It applies in example (not shown), indentation can also favour the axis setting of single mode optical fiber fibre core.The optical fiber arranged in the manner described above
Bragg grating, which can be considered to be cascaded by a series of Fabry-Perot-type cavity, to be formed, therefore Fabry-Perot can be realized in itself
Interference effect.
[embodiment 1]
As shown in figure 3, there is interval between Bragg grating and two end faces of single mode optical fiber fibre core.Single mode optical fiber fibre core
The light of interior transmission is divided into two parts in central region: a part of incident light I from left end incidence1Pass through Bragg grating ar ea, shape
At Bragg resonance, while realizing Fabry-Perot interference effect；Another part light I2Other than Bragg grating ar ea
Core segment.Due to light beam I1、I2The path of process is respectively provided with different refractive index, causes to generate phase difference.Light beam I1、I2
Interval region of the meeting between Bragg grating end and single mode optical fiber fibre core right side meets, at this time light beam I1、I2Occur dry
It relates to, forms Mach Zehnder interferometry effect.To which this example only passes through a Bragg grating while realizing Fabry-Perot
Interference effect and Mach Zehnder interferometry effect.
[embodiment 2]
As shown in figure 4, one end of Bragg grating is located on the end face of single mode optical fiber fibre core one end.In single mode optical fiber fibre core
The light of transmission is divided into two parts in central region: a part of light I from left end incidence1By grating region, it is humorous to form Prague
Vibration, while realizing Fabry-Perot interference effect；Another part light I2By the core segment other than Bragg grating ar ea.
After optical fiber using optical fiber cutter excision Bragg grating right end, the right end of Bragg grating is located immediately at single mode optical fiber fibre core
Right side on, due to the Fresnel reflection effect of fiber end face, light beam I1And I2It can be returned along original optical path, in Bragg grating
Interval region between left end and single mode optical fiber fibre core left side meets, and then Michelson interference effect occurs.To this reality
Example only realizes Fabry-Perot interference effect and Michelson interference effect by a Bragg grating simultaneously.
[embodiment 3]
As shown in figure 5, being set inside single mode optical fiber fibre core there are two Bragg grating, two Bragg gratings are located at same flat
On face, and the plane is parallel to the axis of the single mode optical fiber fibre core；Two Bragg grating central wavelengths having the same, grade
Connection is arranged in single mode optical fiber fibre core.Wherein, single Bragg grating can be achieved at the same time Fabry-Perot as shown in example 1
Interference effect and Mach Zehnder interferometry effect.It is dry to constitute cascade mach zhender for two cascade Bragg gratings in Fig. 5
Interferometer, light beam I1、I2Region after the injection of the right end of left side Bragg grating between two Bragg gratings interferes,
Then the Bragg grating through right side is divided into two parts: a part of light I3By the fiber core part other than the Bragg grating ar ea of right side
Point；Another part light I4By right side Bragg grating ar ea, Bragg resonance is formed, while realizing Fabry-Perot interference
Effect.
Similarly, if the fibre core of Bragg grating right end on the right side of Fig. 5 clipped (not shown), the Bragg grating on right side
The state of example 2 as shown in Figure 4 is reformed into, thus light beam I3、I4Reflected light left end formed Michelson interference effect.
The interferometer can be realized simultaneously two kinds of interference effects, i.e. Fabry-Perot interference effect, Michelson interference effect at this time.
Three or more Bragg gratings, according to arrangement identical with example 3, it may have identical realization principle,
So it will not be repeated.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of dual interferometer based on fiber bragg grating characterized by comprising single mode optical fiber fibre core, inside set
There is a fiber bragg grating, plane where the fiber bragg grating is parallel to the axis of the single mode optical fiber fibre core,
So that when passing through the fiber bragg grating Fabry-Perot interference effect occurs for incident light；The fiber bragg grating
There is interval between two end faces of the single mode optical fiber fibre core, so that incident light is divided into two through the fiber bragg grating
Behind part, can the region between described fiber bragg grating one end and the end face of corresponding single mode optical fiber fibre core meet,
Mach Zehnder interferometry effect occurs.
2. a kind of dual interferometer based on fiber bragg grating characterized by comprising single mode optical fiber fibre core, inside set
There is a fiber bragg grating, plane where the fiber bragg grating is parallel to the axis of the single mode optical fiber fibre core,
So that when passing through the fiber bragg grating Fabry-Perot interference effect occurs for incident light；The fiber bragg grating
Exit end be located on the end face of single mode optical fiber fibre core one end so that incident light is divided into two through the fiber bragg grating
Behind part, in the exit end directly by the corresponding end face reflection of the single mode optical fiber fibre core, two parts reflected light backtracking
Afterwards, the region between the incidence end of the fiber bragg grating and the end face of corresponding single mode optical fiber fibre core is met, and is occurred
Michelson interference effect.
3. a kind of dual interferometer based on fiber bragg grating characterized by comprising single mode optical fiber fibre core, inside set
There are at least two fiber bragg gratings, at least two fiber bragg grating is in the same plane, and the plane is flat
Row is in the axis of the single mode optical fiber fibre core, so that when passing through the fiber bragg grating Fabry-Perot occurs for incident light
Interference effect；At least two fiber bragg gratings central wavelength having the same, cascade are arranged in the single mode optical fiber
In fibre core, so as to which cascade Mach Zehnder interferometry effect occurs after incident light is divided into two parts.
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| CN201710292327.4A CN107179047B (en) | 2017-04-28 | 2017-04-28 | A kind of dual interferometer based on fiber bragg grating |
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| CN201710292327.4A CN107179047B (en) | 2017-04-28 | 2017-04-28 | A kind of dual interferometer based on fiber bragg grating |
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| CN107179047B true CN107179047B (en) | 2019-10-25 |
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| CN111257996B (en) * | 2020-03-18 | 2021-06-01 | 中国科学院长春光学精密机械与物理研究所 | Birefringent waveguide Bragg grating reflector and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519499A (en) * | 2011-12-14 | 2012-06-27 | 华中科技大学 | Micro-structure fiber optic Fabry-Perot cavity quasi based quasi-distributed sensor |
| CN103542925A (en) * | 2013-09-23 | 2014-01-29 | 华中科技大学 | Quasi-distributed optical vibrating sensing device |
| CN203479323U (en) * | 2013-07-12 | 2014-03-12 | 华南师范大学 | Optical fiber refractive index and temperature sensor |
| CN104236602A (en) * | 2014-09-26 | 2014-12-24 | 安徽大学 | Full-optical-fiber sensor capable of measuring temperature and humidity at same time |
| CN104316106A (en) * | 2014-10-28 | 2015-01-28 | 天津理工大学 | Optical fiber sensor based on Mach-Zehnder interference and fiber bragg grating |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519499A (en) * | 2011-12-14 | 2012-06-27 | 华中科技大学 | Micro-structure fiber optic Fabry-Perot cavity quasi based quasi-distributed sensor |
| CN203479323U (en) * | 2013-07-12 | 2014-03-12 | 华南师范大学 | Optical fiber refractive index and temperature sensor |
| CN103542925A (en) * | 2013-09-23 | 2014-01-29 | 华中科技大学 | Quasi-distributed optical vibrating sensing device |
| CN104236602A (en) * | 2014-09-26 | 2014-12-24 | 安徽大学 | Full-optical-fiber sensor capable of measuring temperature and humidity at same time |
| CN104316106A (en) * | 2014-10-28 | 2015-01-28 | 天津理工大学 | Optical fiber sensor based on Mach-Zehnder interference and fiber bragg grating |
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