CN109870771A - A kind of device generating two-dimensional quadrature polarized light source - Google Patents
A kind of device generating two-dimensional quadrature polarized light source Download PDFInfo
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- CN109870771A CN109870771A CN201910316099.9A CN201910316099A CN109870771A CN 109870771 A CN109870771 A CN 109870771A CN 201910316099 A CN201910316099 A CN 201910316099A CN 109870771 A CN109870771 A CN 109870771A
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Abstract
A kind of device generating two-dimensional quadrature polarized light source, belongs to optical fiber source field.Wide spectrum light source 1 of the invention is connect by general single mode fiber 3 with the polarizer 2, and the polarizer 2 waves filter 4 with optical fiber polarisation and connect, and optical fiber polarisation waves filter 4 and connect with polarization beam apparatus 5, and polarization beam apparatus 5 is connect with polarization maintaining optical fibre 6.A kind of device generating two-dimensional quadrature polarized light source provided by the invention, not only spectrum is orthogonal for the two-beam of output, and polarization direction is orthogonal, polarization state in experimentation can be made up to be influenced by external interference generation, it reduces polarization cross and couples bring error, be used two polarization states of polarized light source, the light-source structure is simple, device integration is high, with the good compatibility of fibre system, wherein the optical fiber polarisation provided waves, filtering performance is stable, expandability is strong.
Description
Technical field
The invention belongs to optical fiber source fields, and in particular to a kind of device for generating two-dimensional quadrature polarized light source.
Background technique
Optical fiber transmission has the characteristics that bandwidth, low, light-weight, strong antijamming capability is lost, and it is logical to be widely used in light
The fields such as letter technology, optical sensing technology, optical fiber filter are the devices using optical fiber as prevailing transmission media implementation optically filtering
Part, has the characteristics that low insertion loss, the response of compact-sized, high-frequency, and is being with optical communication system, Fibre Optical Sensor etc.
The integrated aspect of system has inherent advantage.Tunable and multiple wavelength laser light source based on optical fiber filter is the intensive of optic communication
The Primary Component of wavelength-division multiplex technique carries out frequency-selecting to laser using optical fiber filter, realizes the multi-wavelength output of laser.Except this
Except, optical fiber filter also has huge application potential in terms of Fibre Optical Sensor, changes in external environments such as pressure, temperature
The wavelength of Cheng Zhong, filter can change correspondingly, and the variation by measuring wavelength obtains the variation of external physical quantity, and optical fiber is filtered at present
Wave device is applied in pressure, temperature, strain, the measurement of refractive index.Common optical fiber filter has interference-type birefringent
Type optical fiber filter, fiber grating mode filter, acousto-optic modulation mode filter, coupler type filter.
Optical fiber polarisation waves filter (Fiber Polarization Rocking filter, PRF) originating from 19th century
The Birefringent Filter that the solc sixties is proposed, Birefringent Filter is by a series of birefringent filter postponed with same phase
Wave plate composition, simplest Birefringent Filter is stacked by the filter plate of several same thickness with special angle, wherein I
The angle of type Birefringent Filter is αi=-(- 1)iα, the angle of II type Birefringent Filter are αi=(2i-1) α.1980
Mark Johnson leads in birefringence fiber for the first time periodically to be crossed mechanical twisting and I type optical fiber polarisation has been made waves filter,
The transmission spectrum that Stolen in 1984, R.H. wave filter to optical fiber polarisation has carried out careful research.Research in recent years by
Gradually it is intended to the research that the optical fiber based on special optical fiber waves filter sensing characteristics, G.Statkiewicz- in 2014
The transmission that the high-order that Barabach has studied the mechanical induction in microstructured optical fibers and standard ellipse core fibre waves filter is special
Property, and its there is the birefringent spectral dependency of out of phase mode.Anuszkiewicz, A et al. were at 2008 to 2013 years
Between have studied the sensing characteristics such as the temperature, pressure, refractive index for waving filter based on microstructured optical fibers.
Existing filter is many kinds of, and the filter with good polarization characteristic generally has Lyot filter, solc filter
Wave device, sgnac ring wave filter, microwave photon filter based on birefringence fiber etc., Lyot filter, solc filter are crystalline substance
Body stacks mode filter, and poor with the integration capability of fibre system, flexibility is poor, sgnac ring wave filter based on birefringence fiber,
Microwave photon filter construction is complicated, needs a variety of components to be used cooperatively, the light source for being based particularly on the filter receives
Very big limitation.
The light source that many types have been used in fibre optical sensor is divided into coherent source and incoherent according to the coherence of light
Light source.Incoherent light source includes thermal light source, glow discharge spot lamp, light emitting diode, and coherent source includes solid state laser, liquid
Laser, gas laser, semiconductor laser diode, optical fiber laser etc..In order to obtain special light sources, people are usually in light
It is connected the filtering devices such as filter, filter plate after source, generates polarised light (line polarisation, partial poolarized light, rotatory polarization etc.), pectination
Spectrum etc., such as (CN201510952930.1 is based on connection sgnac ring wave filter generation pectination polarised light after laser
The optical filter part of the double sagnac loop mirror loop structures of silicon substrate), however this kind of device is typically only capable to export single polarization direction, list
Comb spectrum, polarization direction cannot compare test using the light of vertical polarization vulnerable to external environmental interference.In order to solve
The above problem, the present invention wave filter by being connected optical fiber polarisation after light source, make light source output two-beam, this two-beam is not
Only polarization direction is orthogonal, and spectrum is orthogonal.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of device for generating two-dimensional quadrature polarized light source, the light source output
Two-beam, not only spectrum is orthogonal but also polarization direction is also orthogonal.
A kind of device generating two-dimensional quadrature polarized light source, structure includes: wide spectrum light source 1, the polarizer 2, general single mode
Optical fiber 3, optical fiber polarisation wave filter 4, polarization beam apparatus 5, polarization maintaining optical fibre 6, and it includes the first light that optical fiber polarisation, which waves filter 4,
Fibre polarization waves filter, the second optical fiber polarisation waves filter, third optical fiber polarisation waves filter, and ASE wide spectrum light source 1 is logical
It crosses general single mode fiber 3 to connect with the polarizer 2, the polarizer 2 waves filter 4 with optical fiber polarisation and connect, and optical fiber polarisation waves filter
Wave device 4 is connect with polarization beam apparatus 5, and polarization beam apparatus 5 is connect with polarization maintaining optical fibre 6.
The optical fiber wave filter by the first optical fiber polarisation waves filter, the second optical fiber polarisation waves filter,
Third optical fiber polarisation waves filter and forms in parallel or in series on same root polarization maintaining optical fibre.
First optical fiber polarisation waves filter or the second optical fiber polarisation waves filter or third optical fiber polarisation shakes
Pendulum filter is periodically reversed by polarization maintaining optical fibre, periodicity N, torsion angle αi=-(- 1)iα, wherein α=π/(4 ×
N), the torsion length of filter is Lt=0.5 × LB, central wavelength λ0=δn×LB, wherein LBIt is long for filter signal period
Degree, δnFor the fast and slow axis refringence of polarization maintaining optical fibre, halfwidth is Δ λ=λ/N.
First optical fiber polarisation waves filter or the second optical fiber polarisation waves filter or third optical fiber polarisation shakes
The central wavelength for putting filter is the peak of the first order or the peak of other orders, k λ0=δnLB, k=0.5,1.5,2.5....,
Middle k is the order of filter.
Wide spectrum light source 1 is ASE light source, and spectral region 1490nm-1610nm, spectrum shape is Gauss spectrum, polarization beam apparatus 5
Output light be ' mountain ' font X-direction polarised light and ' recessed ' font Y-direction polarised light, polarization beam apparatus 5 export two beams
Polarization light polarization direction is orthogonal, and spectral intensity is orthogonal.
The beneficial effects of the present invention are:
A kind of device generating two-dimensional quadrature polarized light source provided by the invention, not only spectrum is orthogonal for the two-beam of output,
And polarization direction is orthogonal, and can make up polarization state in experimentation is influenced by external interference generation, reduces polarization cross coupling
Bring error is closed, two polarization states of polarized light source are used, especially in white light interference experimentation, this
Invention is used as light source, can be substantially reduced the influence of experimental error bring, and can be used to analyze experimental error source and analyze and miss
The size that difference influences experimental result, the light-source structure is simple, device integration is high, the good compatibility with fibre system, wherein
It is strong that the optical fiber polarisation of offer waves filtering performance stabilization, expandability.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is that optical fiber polarisation of the invention waves filter schematic.
Fig. 3 is that optical fiber polarisation of the invention waves Filter Principle schematic diagram.
Fig. 4 is the schematic diagram of present invention production filter.
Fig. 5 is filters in series schematic diagram of the invention.
Fig. 6 is filter parallel connection schematic diagram of the invention.
Fig. 7 is that filter of the invention exports X-axis polarised light and Y-axis polarised light.
Fig. 8 is ASE light source light spectrum in the embodiment of the present invention
Fig. 9 is the X-axis polarised light that the present invention exports.
Figure 10 is the Y-axis polarised light that the present invention exports.
Specific embodiment:
The present invention will be further described with reference to the accompanying drawing:
The present invention be it is a kind of generate two-dimensional quadrature polarized light source device, structure include: wide spectrum light source 1, the polarizer 2,
General single mode fiber 3, optical fiber polarisation wave filter 4, polarization beam apparatus 5, polarization maintaining optical fibre 6, and optical fiber polarisation waves the packet of filter 4
Include that the first optical fiber polarisation waves filter, the second optical fiber polarisation waves filter, third optical fiber polarisation waves filter, ASE wide
Spectrum light source 1 is connect by general single mode fiber 3 with the polarizer 2, and the polarizer 2 waves filter 4 with optical fiber polarisation and connect, and optical fiber is inclined
Shaking pendulum filter 4 is connect with polarization beam apparatus 5, and polarization beam apparatus 5 is connect with polarization maintaining optical fibre 6, using molten between optical fibre device
It picks and is welded, specific structure is as shown in Figure 1.
First optical fiber polarisation waves filter or the second optical fiber polarisation waves filter or third optical fiber polarisation waves filtering
The periodicity of device is N, torsion angle αi=-(- 1)iα, wherein α=π/(4 × N), the torsion length of filter are Lt=0.5 ×
LB, central wavelength λ0=δn×LB, wherein LBFor filter signal period length, δnFor the fast and slow axis refractive index of polarization maintaining optical fibre
Difference, halfwidth are Δ λ=λ/N.
First optical fiber polarisation waves filter or the second optical fiber polarisation waves filter or third optical fiber polarisation shakes
The central wavelength for putting filter is the peak of the first order or the peak of other orders, k λ0=δnLB, k=0.5,1.5,2.5....,
Middle k is the order of filter.
The principle that optical fiber waves filter is as shown in Figure 2 and Figure 3, reverses θ degree in A, B point-to-point transmission forward direction of polarization maintaining optical fibre,
C, turn-back θ degree between D, A to D are denoted as a torsional cyclic Lt, which constantly repeats along optical fiber.B to C is birefringence fiber
Half clap length, clap long δn=λ0/LB, the line polarisation for being parallel to polarization axle y-axis enters optical fiber, and due to twisting between A, B, line is inclined
Light is into θ angle into next section of optical fiber in B point and y-axis, after more than half bats are long, in C point still with line polarisation (with starting line polarisation polarization
Direction differ 2 θ) state enter next section of optical fiber.It is inversely reversed between C, D.After more than half bats are long, E point line polarisation will be with D
Dotted line polarization direction will be in symmetry angle by normal of initial polarization direction.After N number of full bat long period, from y-axis to X-axis
Net conversion ratio is Px=P0sin22Nθ。
Optical fiber polarisation wave the production method of filter as shown in figure 4, the polarization axle of the polarizer and analyzer intersect place,
Optical fiber holding station clamps one end of polarization maintaining optical fibre, and turntable clamps the other end, and turntable rotates in the forward direction the angle θ, CO first2Laser beam
Transverse Heated optical fiber causes the permanent twist of optical fiber in heating part, and after optical fiber natural cooling, turntable is with equal angular θ
Back rotation, while CO2Laser beam vertically moves L along optical fibert, Transverse Heated is then carried out, another permanent twist is generated,
Filter is waved by what this process repeated to generate for 2N+1 time N number of period, in this process, uses OSA spectrometer to supervise always
Survey the quality of spectrum change and filter.
As shown in Figure 5 and Figure 6, filter is waved for concatenated optical fiber polarisation, when the first optical fiber polarisation waves filter
After completing, continues the second optical fiber polarisation of production after which and wave filter；Filtering is waved for optical fiber polarisation in parallel
Device, after the first optical fiber polarisation, which waves filter, to complete, CO2Laser beam returns to initial position, shakes in the first optical fiber polarisation
It puts near filter starting point, continues the second optical fiber polarisation of production and wave filter, the first optical fiber polarisation waves filter starting
Point waves the distance between filter starting point with the second optical fiber polarisation and needs to avoid the occurrence of biggish humorous by simulating, verifying
Vibration.
At 1/6 wavelength of the spectral region that the central wavelength that the first optical fiber polarisation waves filter is located at wide spectrum light source 1,
Two optical fiber polarisations wave at 1/2 wavelength of the spectral region that filter is located at wide spectrum light source 1, third optical fiber polarisation waves filter
The central wavelength spectral region that is located at wide spectrum light source 1 5/6 wavelength at, the wavelength half that three optical fiber polarisations wave filter is high
Wide is the 1/6 of wide spectrum light source spectrum width.
In specific embodiments of the present invention, wide spectrum light source is ASE light source, and spectral region 1490nm-1610nm, composing shape is
Gauss spectrum, as shown in figure 8, the polarization maintaining optical fibre used is panda type polarization-preserving fiber, the fast and slow axis refringence of the optical fiber is δn
=3.5 × 10-4, optical fiber polarisation wave filter by the first optical fiber polarisation waves filter, the second optical fiber polarisation waves filter,
Third optical fiber polarisation waves filters in series composition, and three filters are periodicity N=90, windup-degree α=0.5 °, the
The cycle length that one optical fiber polarisation waves filter is LB1=4.34mm, the cycle length that the second optical fiber polarisation waves filter are
LB2=4.43mm, the cycle length that third optical fiber polarisation waves filter is LB3=4.51mm.The filter made according to these parameters
Wave device, the central wavelength of first filter are λ1=1520nm, halfwidth are Δ λ1=13nm, the polarization conversion rate of polarization axle Y-axis
It is 97%, the central wavelength of second filter is λ2=1550nm, halfwidth are Δ λ2=16nm, the polarization conversion of polarization axle Y-axis
Rate is 99%, and the central wavelength of third filter is λ3=1580nm, halfwidth are Δ λ3=15nm, the optical rotation of polarization axle Y-axis
Changing rate is 99%, and output optical fibre polarization waves filter X-axis polarised light and Y-axis polarised light to polarization beam apparatus respectively, such as Fig. 7 institute
Show.
In the present embodiment, the light source range of ASE is 1490-1610 when optical fiber polarisation waves filter with white light source i.e.
When ASE white light source combines, polarization beam apparatus output complementary X-axis polarised light and Y-axis polarised light spectrum such as Fig. 9 and Figure 10 institute
Show.Since the X-axis polarised light and Y-axis polarised light of polarization beam apparatus output have the characteristics that complementation, when carrying out other experiments, example
If white light interferometric is tested, X-axis polarised light or Y-axis polarised light contrast and experiment can be switched, made up in experimentation partially
The error that polarization state is generated by external interference reduces polarization cross and couples bring error.
Claims (5)
1. a kind of device for generating two-dimensional quadrature polarized light source, structure includes: wide spectrum light source (1), the polarizer (2), common list
Mode fiber (3), optical fiber polarisation wave filter (4), polarization beam apparatus (5), polarization maintaining optical fibre (6), and optical fiber polarisation waves filter
It (4) include that the first optical fiber polarisation waves filter, the second optical fiber polarisation waves filter, third optical fiber polarisation waves filter,
It is characterized by: ASE wide spectrum light source (1) is connect by general single mode fiber (3) with the polarizer (2), the polarizer (2) and optical fiber are inclined
Shaking pendulum filter (4) connection, optical fiber polarisation waves filter (4) and connect with polarization beam apparatus (5), polarization beam apparatus (5) and
Polarization maintaining optical fibre (6) connection.
2. a kind of device for generating two-dimensional quadrature polarized light source according to claim 1, it is characterised in that: optical fiber waves filter
Wave device waves filter by the first optical fiber polarisation, the second optical fiber polarisation waves filter, third optical fiber polarisation waves filter and exists
It is formed in parallel or in series on same root polarization maintaining optical fibre.
3. a kind of device for generating two-dimensional quadrature polarized light source according to claim 1, it is characterised in that: described first
Optical fiber polarisation waves filter or the second optical fiber polarisation waves filter or third optical fiber polarisation waves filter by polarization maintaining optical fibre
It is periodically reversed, periodicity N, torsion angle αi=-(- 1)iα, wherein α=π/(4 × N), the torsion of filter are long
Degree is Lt=0.5 × LB, central wavelength λ0=δn×LB, wherein LBFor filter signal period length, δnFor polarization maintaining optical fibre
Fast and slow axis refringence, halfwidth are Δ λ=λ/N.
4. a kind of device for generating two-dimensional quadrature polarized light source according to claim 1, it is characterised in that: described first
Optical fiber polarisation waves filter or the second optical fiber polarisation waves filter or third optical fiber polarisation waves the central wavelength of filter
For the peak of the first order or the peak of other orders, k λ0=δnLB, k=0.5,1.5,2.5...., wherein k is the order of filter.
5. a kind of device for generating two-dimensional quadrature polarized light source according to claim 1, it is characterised in that: wide spectrum light source
It (1) is ASE light source, spectral region 1490nm-1610nm, spectrum shape is Gauss spectrum, and the output light of polarization beam apparatus (5) is
Two beam polarised lights of the X-direction polarised light of ' mountain ' font and the Y-direction polarised light of ' recessed ' font, polarization beam apparatus (5) output are inclined
Shaking, direction is orthogonal, and spectral intensity is orthogonal.
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Cited By (2)
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| CN114152591A (en) * | 2021-12-03 | 2022-03-08 | 中国电子科技集团公司第三十四研究所 | Position and wavelength demodulation system and method for cascade fiber grating sensing array |
| CN115128822A (en) * | 2022-05-23 | 2022-09-30 | 之江实验室 | Optical frequency comb polarization multiplexing device based on optical fiber Fabry-Perot microcavity |
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