CN110031097A - A kind of all -fiber Gaussian SLED light source light spectrum planarizer - Google Patents
A kind of all -fiber Gaussian SLED light source light spectrum planarizer Download PDFInfo
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- CN110031097A CN110031097A CN201910431785.0A CN201910431785A CN110031097A CN 110031097 A CN110031097 A CN 110031097A CN 201910431785 A CN201910431785 A CN 201910431785A CN 110031097 A CN110031097 A CN 110031097A
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- 239000000835 fiber Substances 0.000 title claims abstract description 90
- 238000001228 spectrum Methods 0.000 title claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000001066 destructive effect Effects 0.000 claims description 10
- 230000003595 spectral effect Effects 0.000 claims description 9
- 238000000985 reflectance spectrum Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/26—Generating the spectrum; Monochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filters
Abstract
The present invention relates to technical field of optical fiber, and in particular to a kind of all -fiber Gaussian SLED light source light spectrum planarizer.Structure is complicated for existing in the prior art, the problem of vulnerable to external influences, the technical solution adopted by the present invention includes fibre optic isolater, 1 × 2 fiber coupler, fiber optical circulator, the extrinsic optical fiber Fabry-Perot chamber of low fineness, fibre optic attenuator, described fibre optic isolater one end connects SLED light source incidence port, the other end is connect with the entry port of 1 × 2 fiber coupler, one exit ports of 1 × 2 fiber coupler and the entry port of fibre optic attenuator connect, the connection of 1 port of another exit ports and fiber optical circulator, the port of fiber optical circulator is connect with the tail optical fiber of extrinsic optical fiber Fabry-Perot chamber, the port of fiber optical circulator and the exit ports of fibre optic attenuator are connect with two entry ports of 2 × 1 fiber couplers respectively, the exit ports of 2 × 1 fiber couplers are the outgoing of SLED light source Port.
Description
Technical field:
The present invention relates to technical field of optical fiber, and in particular to a kind of flat makeup of all -fiber Gaussian SLED light source light spectrum
It sets.
Background technique:
Super-radiance light emitting diode (SLED) has many advantages, such as high power and broadband spectral, in fibre optic gyroscope, is concerned with and breaks
It is widely applied in the optical fiber sensing systems such as layer scanning.SLED as Fibre Optical Sensor demodulate and measuring device in light source,
Its spectral characteristic directly determines the demodulation accuracy of measuring device, the parameters such as physical quantity range.
Especially in Phase Demodulation Method of Optic, the influence of light source light spectrum characteristic is more significant.Non-planarization at the top of its spectrum
The accuracy of the measurement of demodulating system can be reduced in sensing and demodulating technology, to influence the precision of demodulation.For example, in Fiber Optic Sensor
In amber sensor demodulating system, Two-peak method generally can be used and multimodal method measurement optical fiber Fabry-Perot sensor chamber is long, according to Fa-Po cavity
Chamber long value, to demodulate corresponding physical parameter, thus, in the demodulating process, the accurate acquisition of peak position is just aobvious
It obtains particularly important.
Since Gaussian SLED spectrum is in Gaussian Profile, the peak position in the reflectance spectrum of Fabry-Perot sensor is by light source light
The influence of Spectral structure directly affects the demodulation accuracy of the system to introduce measurement error.In addition, in broadband photon device
During the testing and measuring of part, the wideband light source with flat spectrum is more conducive to the performance test and application of device, Gaussian
Spectroscopic light source and the light source of other non-planarizations are all not directly applicable testing light source.The thus planarization of SLED light source light spectrum
Just it is particularly important.
Currently, the box-shaped spectra device of light source is mainly using based on acousto-optic tunable filter, fiber bragg grating
Or long-period fiber grating.However, these technologies are mainly used for the gain balance of image intensifer or ASE light source, and cannot be direct
For in the spectrum flattening technique of SLED.For SLED light source, conventional method is brilliant using Mach-Zehnder interferometer or optics
Lattice adapter carries out box-shaped spectra processing, but there is the problem of structure is complicated, vulnerable to external influences.
Summary of the invention:
Structure is complicated for the problem that existing in the prior art, and vulnerable to external influences, the invention proposes one kind
All -fiber Gaussian SLED light source light spectrum planarizer.
In order to reach the purpose of the present invention, present invention provide the technical scheme that a kind of all -fiber Gaussian SLED light source
Box-shaped spectra device, including fibre optic isolater, 1 × 2 fiber coupler, fiber optical circulator, low fineness extrinsic optical fiber
Fa-Po cavity, fibre optic attenuator, are characterized in that, described fibre optic isolater one end connects SLED light source incidence port, another
End is connect with the entry port of 1 × 2 fiber coupler, an exit ports of 1 × 2 fiber coupler and entering for fibre optic attenuator
Penetrate port connection, the 1 port connection of another exit ports and fiber optical circulator, 2 ports of fiber optical circulator and extrinsic light
The tail optical fiber of fine Fa-Po cavity connects, the exit ports of 3 ports of fiber optical circulator and fibre optic attenuator respectively with 2 × 1 fiber couplings
Two entry ports of device connect, and the exit ports of 2 × 1 fiber couplers are SLED light source exit ports.
The central wavelength phase of the reflectance spectrum destructive interference central wavelength of above-mentioned extrinsic optical fiber Fabry-Perot chamber and SLED light source
Together, the spectral region between the reflection peak of destructive interference central wavelength two sides and passes through adjusting close to the three dB bandwidth of SLED light source
The attenuation coefficient of fibre optic attenuator makes the part emergent light of SLED light source reach best with extrinsic all -fiber Fa-Po cavity reflected light
Power ratio.
Compared with prior art, beneficial effects of the present invention are as follows:
1, all -fiber Gaussian SLED light source light spectrum planarizer proposed by the invention and transmission spectra flat method phase
Than not needing multiple Mach-Zehnder interferometer cascades, not needing the phase delay and optical fiber coupling that accurately consider various pieces
The coefficient of coup of clutch, apparatus structure is more simple, be more easily implemented and cost is relatively low.
2, due to realizing box-shaped spectra by the way of extrinsic type Fabry-perot optical fiber chamber and fibre optic attenuator decaying cooperation,
Extrinsic type Fabry-perot optical fiber chamber size itself is minimum, wants to temperature, the sensibility of vibration compared to Mach-Zehnder interferometer
It is much lower, therefore there is better environmental suitability and stability, it is not easy to be disturbed.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the corresponding reflection spectrum curve of different length extrinsic optical fiber Fabry-Perot chamber in the embodiment of the present invention.
Fig. 3 be in the embodiment of the present invention reflectance spectrum of extrinsic optical fiber Fabry-Perot chamber and Gaussian SLED light source light spectrum not
With the output spectrum curve being superimposed under attenuation coefficient.
Fig. 4 is actual measurement all -fiber Gaussian SLED light source light spectrum, extrinsic optical fiber Fabry-Perot cavity reflection in the embodiment of the present invention
The output spectrum of spectrum and planarizer.
The reference numerals are as follows:
1- fibre optic isolater, the fiber coupler of 2-1 × 2,3- fiber optical circulator, 4- extrinsic optical fiber Fabry-Perot chamber, 5- optical fiber
Attenuator, the fiber coupler of 6-2 × 1,7-SLED light source incidence port, 8-SLED light source exit ports.
Specific embodiment
The present invention is described in detail below in conjunction with drawings and examples.
A kind of basic principle of all -fiber Gaussian SLED light source light spectrum planarizer provided by the invention is: by Gauss
The emergent light of type SLED light source is divided into two-way, and the directly incident extrinsic optical fiber Fabry-Perot chamber of light, generates the reflected light of class sine all the way
Spectrum, the wave trough position of reflected light destructive interference is corresponding with the central wavelength of SLED light source, with the in addition emergent light of SLED all the way
It is overlapped by fiber coupler, the ratio of the optical power of two-way light is adjusted by fibre optic attenuator, to reach planarization
The purpose of SLED light source light spectrum.
Referring to Fig. 1, the present embodiment provides a kind of all -fiber Gaussian SLED light source light spectrum planarizer, including optical fiber every
From device 1,1 × 2 fiber coupler 2, fiber optical circulator 3, the extrinsic optical fiber Fabry-Perot chamber 4 of low fineness, fibre optic attenuator 5.Institute
Say that 1 one end of fibre optic isolater connects SLED light source incidence port 7, the other end is connect with the entry port of 1 × 2 fiber coupler 2,
One exit ports of 1 × 2 fiber coupler are connect with the entry port of fibre optic attenuator 5, another exit ports and optical fiber
1 port of circulator connects, and 2 ports of fiber optical circulator are connect with the tail optical fiber of extrinsic optical fiber Fabry-Perot chamber 4, fiber optical circulator
The exit ports of 3 ports and fibre optic attenuator 5 are connect with two entry ports of 2 × 1 fiber couplers 6 respectively, 2 × 1 optical fiber
The exit ports of coupler 6 are SLED light source exit ports 8.
The reflectance spectrum destructive interference central wavelength of the extrinsic optical fiber Fabry-Perot chamber 4 of described low fineness in the present embodiment
Identical as the central wavelength of SLED light source, spectral region between the reflection peak of destructive interference central wavelength two sides is close to SLED light
The three dB bandwidth in source, and the attenuation coefficient by adjusting fibre optic attenuator 5 make the part emergent light of SLED light source and extrinsic complete
Fabry-perot optical fiber cavity reflection light reaches best power ratio.
Gaussian SLED light source light spectrum mathematical model can indicate are as follows:
Wherein, I0Indicate the spectral concentration of SLED light source, λPIndicate the peak wavelength of SLED light source, BλIndicate half-peak breadth.
For the extrinsic optical fiber Fabry-Perot chamber of low fineness, method Fabry-Parot interferent can be equivalent to two-beam interference, reflection
Rate can indicate are as follows:
Wherein, A and B is two constants, and L indicates that the distance between two fiber end faces, n indicate extrinsic optical fiber Fabry-Perot chamber
The refractive index of filled media, if it is vacuum or air chamber, n ≈ 1.
The long L of the chamber of extrinsic optical fiber Fabry-Perot chamber needs to meet occurs destructive interference at SLED light source center wavelength location,
Interference condition are as follows:
The long relational expression with wavelength of chamber can be obtained:
It is found that need to meet in light source peak position interference cancellation, extrinsic optical fiber Fabry-Perot chamber chamber is long to be equal to SLED light source center
A series of long corresponding reflectance spectrum of Fa-Po cavity chambers can be obtained in the odd-multiple of wavelength a quarter as a result,.In addition, in order to realize
The planarization of spectrum needs Free Spectral Range of the Fabry-perot optical fiber chamber near central wavelength to be approximately equal to the 3dB of SLED light source
Bandwidth.
The output spectrum of the exit ports of 2 × 1 fiber coupler of box-shaped spectra device may be expressed as:
Wherein, κ1、κ2For the light splitting coefficient of the two-way emergent light of 1 × 2 fiber coupler, κ3、κ4For 2 × 1 fiber couplers
Two-way incident light light splitting coefficient, AtIndicate the attenuation coefficient of fibre optic attenuator.
The long central wavelength and half Gao Quan needed according to Gaussian SLED light source of the chamber of low fineness extrinsic optical fiber Fabry-Perot chamber
Width determines.
The SLED light source that central wavelength is 1568nm, bandwidth is 98nm is designed.Extrinsic optical fiber Fabry-Perot chamber
Chamber is long to need to meet the generation destructive interference at SLED light source center wavelength location, and the peak wavelength of destructive interference trough two sides
Interval and the full width at half maximum of SLED light source are close, it is contemplated that the bandwidth of SLED light source is 98nm, and the long m of Fa-Po cavity chamber is set as
14,15,16, obtain the corresponding reflection spectrum curve of different length extrinsic optical fiber Fabry-Perot chamber as shown in Figure 2.Because of Fa-Po cavity
Peak-to-peak value spectral width it is wider, the output spectrum being superimposed with SLED light source light spectrum is more flat, so selection width is maximum anti-
It is long to penetrate the long Fa-Po cavity chamber as the present embodiment of the corresponding chamber of spectrum, the long m of Fa-Po cavity chamber is 14, a length of 12.1675 μm of chamber.
Low fineness extrinsic optical fiber Fabry-Perot chamber can be using one section of single mode optical fiber with tail optical fiber output and one section without tail optical fiber
The single mode optical fiber of output and quartzy glass capillary are constituted.
1 × 2 and 2 × 1 fiber couplers used are broadband optical fiber coupler, central wavelength 1550nm, and bandwidth is
100nm, splitting ratio 50:50, the splitting ratio for being equivalent to two fiber couplers is κ1=κ2=κ3=κ4=0.5.
By model S5FC1550S-A2, (central wavelength 1568nm, bandwidth are that 98nm peak power output is
Gaussian SLED light source 3.623mW), is connected to SLED light source access interface, and box-shaped spectra output port connects spectrum analysis
Instrument is monitored.
Adjust attenuation coefficient At, obtain all -fiber Gaussian SLED light source light spectrum planarizer as shown in Figure 3
Output spectrum.
By choosing a Duan Guangpu, the largest light intensity and minimum intensity of light in this section of spectrum are then found out, formula is then substituted into
Obtain the flatness of spectrum.
From the figure 3, it may be seen that the flatness of output spectrum has differences under differential declines coefficient, as attenuation coefficient At0.2
When neighbouring, the planarization of output spectrum is best.Output spectrum is surveyed, as attenuation coefficient AtWhen being 0.198, as shown in figure 4, can be with
It obtains in wavelength being within the scope of 1545.4nm~1590.5nm, the flatness of spectrum reaches 0.32dB.
The invention proposes a kind of all -fiber Gaussian SLED light source light spectrum planarizers, for Gaussian SLED light
Gaussian may be implemented by the control of the chamber of extrinsic optical fiber Fabry-Perot chamber long adjusting and fibre optic attenuator attenuation coefficient in source
The planarization of SLED light source light spectrum.
Claims (2)
1. a kind of all -fiber Gaussian SLED light source light spectrum planarizer, including fibre optic isolater (1), 1 × 2 fiber coupler
(2), fiber optical circulator (3), the extrinsic optical fiber Fabry-Perot chamber (4) of low fineness, fibre optic attenuator (5), the fibre optic isolater
(1) one end connection SLED light source incidence port (7), the other end are connect with the entry port of 1 × 2 fiber coupler (2), 1 × 2 light
One exit ports of fine coupler are connect with the entry port of fibre optic attenuator (5), another exit ports and optical fiber ring
1 port of device connects, and 2 ports of fiber optical circulator are connect with the tail optical fiber of extrinsic optical fiber Fabry-Perot chamber (4), fiber optical circulator
(3) exit ports of port and fibre optic attenuator (5) are connect with two entry ports of 2 × 1 fiber couplers (6) respectively, 2 ×
The exit ports of 1 fiber coupler (6) are SLED light source exit ports (8).
2. a kind of all -fiber Gaussian SLED light source light spectrum planarizer according to claim 1, it is characterised in that: institute
State the reflectance spectrum destructive interference central wavelength of the extrinsic optical fiber Fabry-Perot chamber (4) of low fineness and the central wavelength of SLED light source
Identical, spectral region between the reflection peak of destructive interference central wavelength two sides and passes through tune close to the three dB bandwidth of SLED light source
The attenuation coefficient for saving fibre optic attenuator (5), reaches the part emergent light of SLED light source with extrinsic all -fiber Fa-Po cavity reflected light
To best power ratio.
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| CN201910431785.0A CN110031097B (en) | 2019-05-23 | 2019-05-23 | All-fiber Gaussian SLED light source spectrum flattening device |
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| CN201910431785.0A CN110031097B (en) | 2019-05-23 | 2019-05-23 | All-fiber Gaussian SLED light source spectrum flattening device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112526202A (en) * | 2020-11-19 | 2021-03-19 | 哈尔滨理工大学 | Optical fiber sensing device based on ultrasonic detection voltage and implementation method |
| CN112630530A (en) * | 2020-11-19 | 2021-04-09 | 哈尔滨理工大学 | Optical fiber sensing device based on ultrasonic detection frequency and implementation method |
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| CN101499624A (en) * | 2009-03-06 | 2009-08-05 | 中国科学院上海光学精密机械研究所 | Optical fiber coupling outputting vertical cavity surface emitting semiconductor laser device |
| CN101943772A (en) * | 2010-08-26 | 2011-01-12 | 华中科技大学 | Tunable optical comb filter combining G-T resonant cavity and birefringence element |
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2019
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Patent Citations (3)
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| CN101499624A (en) * | 2009-03-06 | 2009-08-05 | 中国科学院上海光学精密机械研究所 | Optical fiber coupling outputting vertical cavity surface emitting semiconductor laser device |
| CN101943772A (en) * | 2010-08-26 | 2011-01-12 | 华中科技大学 | Tunable optical comb filter combining G-T resonant cavity and birefringence element |
| CN102980661A (en) * | 2012-11-07 | 2013-03-20 | 中国计量科学研究院 | Standard optical-fiber source device with changeable degree of polarization |
Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526202A (en) * | 2020-11-19 | 2021-03-19 | 哈尔滨理工大学 | Optical fiber sensing device based on ultrasonic detection voltage and implementation method |
| CN112630530A (en) * | 2020-11-19 | 2021-04-09 | 哈尔滨理工大学 | Optical fiber sensing device based on ultrasonic detection frequency and implementation method |
| CN112526202B (en) * | 2020-11-19 | 2021-09-07 | 哈尔滨理工大学 | Optical fiber sensing device based on ultrasonic detection voltage and implementation method |
| CN112630530B (en) * | 2020-11-19 | 2021-09-07 | 哈尔滨理工大学 | Optical fiber sensing device based on ultrasonic detection frequency and implementation method |
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