CN104536091B - A kind of not damaged tunable fiber power attenuator - Google Patents
A kind of not damaged tunable fiber power attenuator Download PDFInfo
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- CN104536091B CN104536091B CN201410768569.2A CN201410768569A CN104536091B CN 104536091 B CN104536091 B CN 104536091B CN 201410768569 A CN201410768569 A CN 201410768569A CN 104536091 B CN104536091 B CN 104536091B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
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Abstract
The invention discloses a kind of not damaged tunable fiber power attenuator, including screw thread column and base, the screw thread column is fixed on base, the screw thread column is provided with a pair of fiber clamps, the V-shaped groove for accommodating optical fiber is offered on the fiber clamp, the pair of fiber clamp is connected with screw thread column by screw thread and direction of rotation is opposite.Not damaged tunable fiber power attenuator provided by the invention, utilize the bending loss of optical fiber, the length of optical fiber on screw thread column is wrapped in by regulation so as to realize that the not damaged to fibre system, a wide range of, high-precision continuous power tune, and can be optionally plugged into optional position in light path, original fibre system will not be caused to damage or changed, it is simple in construction, it is easy to operate, connected reliably between component, stability is good, it is cheap, service life length.
Description
Technical field
The present invention relates to a kind of optical electron device, more particularly to a kind of not damaged tunable fiber power attenuator.
Background technology
With the fast development of optical fiber industry, people it is also proposed higher requirement to optic communication device.Optical attenuator is
It is intended to reduce a kind of device of transmitting optical power in waveguide.Need to be dropped signal intensity with attenuator in the path of optical fiber transmission
It is low to arrive required intensity.For example in general spectrometer, power no more than hundreds of milliwatts of its input light, otherwise
The loss of device will easily be caused.Too high luminous power is by the distortion for causing electric signal and nonlinear increasing in photoreceiver
Add, and then reduce the service life of device.Therefore need to carry out dependence test and processing after decaying to some light sources again.But
It is that the degree of decay is also not the smaller the better, in photoreceiver, if its luminous power most preferably receives luminous power less than it,
Signal amplitude can be caused small and the deterioration of signal to noise ratio.Therefore it provides a kind of achievable attenuation is a wide range of, high-precision, continuous
Tunable optical power attenuation device is very necessary.
A kind of currently used attenuator is the attenuator of joint insertion, and this attenuator has problems with：1st, it is a large amount of
Heat enter attenuator, easily burn out the connector of the joints of optical fibre or attenuator；2nd, junction portion has part reflected light
Returned along optical fiber, may result in the damage of light source or backing system；3rd, step evolution attenuation is had, it is difficult to which realization declines from zero
Subtract；4th, many occasion fiber links are closings, can not insert other optical devices, it is necessary to welding and plug-in type attenuator phase
The plug matched somebody with somebody, this can increase fusing point, destroy the integrality of fiber link, and complex operation.
At present also have it is a kind of with more universal method be in optical fibre channel access one section of attenuating fiber, in signal
Part input power is consumed or attenuated in transmission, and remainder can continue through the system.But this attenuating fiber exists
Impurity element need to be added during manufacture, production cost is higher, and reliability and stability are poor.In addition, this method can also increase it is molten
Point, complex operation, the integrality for destroying fiber link and pad value fix the continuous tuning for being difficult to attenuation.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of not damaged tunable fiber power attenuator, can realize
Attenuation is a wide range of, high-precision continuous tuning, and can be optionally plugged into optional position in light path, will not be to original fibre system
Cause to damage or change, simple in construction, easy to operate, stability is good.
The present invention is to provide a kind of not damaged tunable fiber work(to solve the technical scheme that above-mentioned technical problem uses
Rate attenuator, including screw thread column and base, the screw thread column are fixed on base, and the screw thread column is provided with a pair of light
Fine fixture, the V-shaped groove for accommodating optical fiber is offered on the fiber clamp, and the pair of fiber clamp and screw thread column passes through screw thread
It is connected and direction of rotation is opposite.
Above-mentioned not damaged tunable fiber power attenuator, wherein, the fiber clamp includes magnetic clamping plate, the V
Shape groove is on the magnetic clamping plate, and the magnetic clamping plate is provided with foldable tabletting, and the tabletting is provided with spring washer, described
Spring washer is located at the top of V-shaped groove.
Above-mentioned not damaged tunable fiber power attenuator, wherein, the pair of fiber clamp is oppositely arranged up and down, institute
The turnover for stating tabletting on a pair of fiber clamps is in opposite direction.
Above-mentioned not damaged tunable fiber power attenuator, wherein, the diameter range of the screw thread column for 4mm~
10mm。
Above-mentioned not damaged tunable fiber power attenuator, wherein, for single-mode fiber, the diameter of the screw thread column
According to the bending loss of optical fiber of required regulation, determined by following relation：
Wherein, ξ=Δ3/21.137Δ-0.01, Rn=n2R/λ0, Δ=(n1-n2)/n1；R be optical fiber bending radius, optical fiber
Bending diameter 2R be screw thread column diameter, λ0For operation wavelength, n1And n2The respectively refractive index of fiber core and covering, Δ
For the relative index of refraction of optical fiber, λ0Unit with R is μm.
Present invention contrast prior art has following beneficial effect：Not damaged tunable fiber power provided by the invention declines
Subtract device, using the bending loss of optical fiber, the length of optical fiber on screw thread column is wrapped in by regulation so as to realize to fibre system
Not damaged, a wide range of, high-precision continuous power tuning, and optional position in light path can be optionally plugged into, will not be to original
Fibre system is caused to damage or changed, simple in construction, easy to operate, is connected reliably between component, stability is good, cheap, makes
Use long lifespan.
Brief description of the drawings
Fig. 1 is not damaged tunable fiber power attenuator structural representation of the present invention.
Fig. 2 is the structural representation of fiber clamp in optical fiber power attenuator in the present invention；
The optical fiber power attenuator that Fig. 3 is the present invention controls bending radius and bending loss schematic diagram；
Fig. 4 is the structural representation of one concrete application example of optical fiber power attenuator of the present invention.
In figure：
The base of 1 fiber clamp, 2 screw thread column 3
The gain fibre of 11 high-power semiconductor laser, 12 bundling device 13
The optical fiber power attenuator of 14 high reflectance fiber grating, 15 antiradar reflectivity fiber grating 16
The magnetic clamping plate of 17 energy-transmission optic fibre, 18 spectrometer 101
The V-shaped groove of 102 tabletting, 103 spring washer 104
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is not damaged tunable fiber power attenuator structural representation of the present invention；Fig. 2 is optical fiber power in the present invention
The structural representation of fiber clamp in attenuator.
Fig. 1 and Fig. 2 are referred to, not damaged tunable fiber power attenuator provided by the invention includes the He of screw thread column 2
Base 3, the screw thread column 2 are fixed on the base 3, and the screw thread column 2 is provided with a pair of fiber clamps 1, the fibre clip
The V-shaped groove 104 for accommodating optical fiber is offered on tool 1, the pair of fiber clamp 1 is connected and rotated by screw thread with screw thread column 2
In the opposite direction.
Not damaged tunable fiber power attenuator provided by the invention, wherein, the fiber clamp 1 includes magnetic clamping plate
101, for the V-shaped groove 104 on the magnetic clamping plate 101, the magnetic clamping plate 101 is provided with foldable tabletting 102, institute
State tabletting 102 and be provided with spring washer 103, the spring washer 103 is located at the top of V-shaped groove 104, and optical fiber can be slided slightly in fixture.
It is covered with the screw thread of equivalent diameter on described screw thread column 2；There is screw thread on described magnetic clamping plate 101, and diameter is stood with screw thread
The screw thread of post matches, can spiral rotating on screw thread column 2.The pair of fiber clamp 1 is preferably oppositely arranged placement up and down
In on screw thread column, the turnover of tabletting 102 is in opposite direction on the pair of fiber clamp 1 so that target carries out power attenuation
Optical fiber can be smoothly wrapped on screw thread column 2.
The optical fiber power attenuator that Fig. 3 is the present invention controls bending radius and bending loss schematic diagram.
It is continuing with referring to Fig. 3, principle of the invention, except the splice loss, splice attenuation of optical fiber and the junction loss of optical fiber, light
Fine loss also derives from the bending of optical fiber.Because in fibre-optical bending, the mould conducted in optical fiber can be damaged due to radiation
Deplete power.The size of bending loss and the inversely proportional relation of the winding radius of optical fiber.When fibre-optical bending, unit length optical fiber
Loss determine that, when radius of curvature is more than a critical value Rc, bending loss very little can be ignored by its winding radius；
But when radius of curvature is less than critical value Rc, additional loss increases sharply exponentially rule.The present invention is namely based on light
Fine macrobending loss rule and design：In the timing of unit length fibre loss one, wound by changing the length of optical fiber so as to
So that the loss of optical fiber is adjustable.
By taking single-mode fiber as an example, for the optical fiber of unit length, the pass between its bending loss and its bending radius
System can be reduced to following formula：
Wherein ξ=Δ3/21.137Δ-0.01, Rn=n2R/λ0, Δ=(n1-n2)/n1；R be optical fiber bending radius, λ0For work
Make wavelength, n1And n2The respectively refractive index of fiber core and covering, Δ are the relative index of refraction of optical fiber.λ0Unit with R is μ
m.Analog simulation is carried out to above formula with Matlab, bending loss and the variation diagram of bending radius can be drawn, as seen from Figure 3, bending
The loss that the smaller unit length optical fiber of radius introduces is bigger, and when bending radius is in below 5mm, bending loss is by rapid growth.
Therefore, column diameter general control of the invention is between 4mm~10mm, and such optical fiber can both introduce considerable waste, again
Optical fiber will not be caused to damage.In actual applications, the attenuator in the present invention can be carried out to any one section of optical fiber in light path
Optical fiber, is clamped in two fixtures, optical fiber can slightly slide in fixture, gently rolling clamp so that optical fiber by operation first
Along screw thread uniform winding on column.The position rotated by two fiber clamps of change on screw thread column is and then change light
Fine coiling length, it is achieved thereby that the continuous decay of optical fiber power.Because the length controlled range for winding optical fiber is big, can be achieved
Zero starting point attenuation, a wide range of, decay of continuously adjustable.High-precision decay can be realized by minor rotation fiber clamp
Tuning, for example a lock-screw can be set at the screwed hole of magnetic clamping plate, after chucking position determination, tightening screw is to push up
Tight stud is so as to realizing the fixation of fixture.This apparatus structure is simple, easy to operate, is connected reliably between component, stability is good, valency
Lattice are cheap, service life length, and original fibre system will not be caused to damage or changed.
Fig. 4 is the structural representation of one concrete application example of optical fiber power attenuator of the present invention.
It is the laser spectrum for measuring a high-power fiber grating laser continuing with the purpose referring to Fig. 4, this example.
The composition of this high-power fiber grating laser is that high-power semiconductor laser 11 is coupled into gain fibre through bundling device 12
13, the both ends of laser cavity are high reflectance fiber grating 14 and antiradar reflectivity fiber grating 15.In order to prevent high power laser light
Output is caused to damage to spectrometer 18, and one section of outer cladding diameter after antiradar reflectivity fiber grating 15 is 125 μm by the present invention
Energy-transmission optic fibre 17 is wound on optical fiber power attenuator 16 provided by the invention, by adjusting two folder in optical fiber power attenuator 16
The relative position on screw thread of tool, so as to change the coiling length of energy-transmission optic fibre 17 and bending loss size, and then by laser
Reentered after power attenuation to suitable size and be incident upon spectrometer 18.To prevent the unwanted oscillation in laser, energy-transmission optic fibre 17
Other end incisal bevel.The laser of this inclined-plane output is difficult with the attenuator of joint insertion, because having very big docking damage
Consumption, it is impossible to realize the power attenuation tuning of small range.And the achievable zero starting point attenuation of the present invention, a wide range of, continuously adjustabe
Humorous decay.Secondly the size of pumping source incident power can cause the change of optical fiber grating temperature, cause fiber grating reflection peak with
Temperature and drift about, the operation wavelength of laser can also change, therefore meeting while by adjusting pumping source size tuning laser power
Cause the change of optical maser wavelength, influence the accuracy of wavelength measurement.But provide optical fiber power attenuator 16 by the present invention, so that it may
Avoid, because the present invention can only be decayed to optical fiber power without the wavelength for changing laser.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification and perfect, therefore the protection model of the present invention can be made
Enclose to work as and be defined by what claims were defined.
Claims (5)
1. a kind of not damaged tunable fiber power attenuator, it is characterised in that described including screw thread column (2) and base (3)
Screw thread column (2) is fixed on base (3), and the screw thread column (2) is provided with a pair of fiber clamps (1), the fiber clamp
(1) V-shaped groove (104) for accommodating optical fiber is offered on, the pair of fiber clamp (1) is connected with screw thread column (2) by screw thread
And direction of rotation is opposite.
2. not damaged tunable fiber power attenuator as claimed in claim 1, it is characterised in that the fiber clamp (1)
Including magnetic clamping plate (101), the V-shaped groove (104) sets on the magnetic clamping plate (101) on the magnetic clamping plate (101)
There is foldable tabletting (102), the tabletting (102) is provided with spring washer (103), and the spring washer (103) is located at V-shaped groove (104)
Top.
3. not damaged tunable fiber power attenuator as claimed in claim 2, it is characterised in that the pair of fiber clamp
(1) it is oppositely arranged up and down, the turnover of tabletting (102) is in opposite direction on the pair of fiber clamp (1).
4. the not damaged tunable fiber power attenuator as described in any one of claims 1 to 3, it is characterised in that the spiral shell
The diameter range of line column (2) is 4mm~10mm.
5. not damaged tunable fiber power attenuator as claimed in claim 4, it is characterised in that for single-mode fiber, institute
The bending loss of optical fiber of diameter regulation needed for of screw thread column (2) is stated, is determined by following relation：
<mrow>
<mi>A</mi>
<mo>=</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<mi>R</mi>
</mrow>
</mfrac>
<mfrac>
<msup>
<mn>10</mn>
<mn>4</mn>
</msup>
<msqrt>
<mi>&Delta;</mi>
</msqrt>
</mfrac>
<msup>
<mn>10</mn>
<mrow>
<mn>1.29</mn>
<mo>-</mo>
<mn>2.17</mn>
<msub>
<mi>&xi;R</mi>
<mi>n</mi>
</msub>
<mo>-</mo>
<mn>0.58</mn>
<msup>
<mi>&xi;</mi>
<mn>2</mn>
</msup>
<msup>
<msub>
<mi>R</mi>
<mi>n</mi>
</msub>
<mn>2</mn>
</msup>
</mrow>
</msup>
<mrow>
<mo>(</mo>
<mi>d</mi>
<mi>B</mi>
<mo>/</mo>
<mi>c</mi>
<mi>m</mi>
<mo>)</mo>
</mrow>
</mrow>
Wherein, ξ=Δ3/21.137Δ-0.01, Rn=n2R/λ0, Δ=(n1-n2)/n1；R be optical fiber bending radius, fibre-optical bending
Diameter 2R be screw thread column diameter, λ0For operation wavelength, n1And n2The respectively refractive index of fiber core and covering, Δ are light
Fine relative index of refraction, λ0Unit with R is μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768569.2A CN104536091B (en) | 2014-12-12 | 2014-12-12 | A kind of not damaged tunable fiber power attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768569.2A CN104536091B (en) | 2014-12-12 | 2014-12-12 | A kind of not damaged tunable fiber power attenuator |
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| Publication Number | Publication Date |
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| CN104536091A CN104536091A (en) | 2015-04-22 |
| CN104536091B true CN104536091B (en) | 2017-11-21 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW547651U (en) * | 2001-08-29 | 2003-08-11 | Hon Hai Prec Ind Co Ltd | Variable optical attenuator |
| CN2519303Y (en) * | 2001-12-31 | 2002-10-30 | 深圳朗光科技有限公司 | All optical fiber light adjustable attenuator |
| CN1176399C (en) * | 2002-12-06 | 2004-11-17 | 武汉理工大学 | Optical fiber type variable optical attenuator |
| CN102207584A (en) * | 2010-03-29 | 2011-10-05 | 西安金和光学科技有限公司 | All-fiber precision variable optical attenuator |
| CN101881633B (en) * | 2010-04-06 | 2012-11-28 | 西安金和光学科技有限公司 | Spring type high-precision optical fiber sensor based on optical fiber bending loss |
| CN204287540U (en) * | 2014-12-12 | 2015-04-22 | 中国电子科技集团公司第二十三研究所 | A kind of not damaged tunable fiber power attenuator |
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