CN208110191U - A kind of tunable Polarization filter based on D type photonic crystal fiber - Google Patents
A kind of tunable Polarization filter based on D type photonic crystal fiber Download PDFInfo
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- CN208110191U CN208110191U CN201820210853.1U CN201820210853U CN208110191U CN 208110191 U CN208110191 U CN 208110191U CN 201820210853 U CN201820210853 U CN 201820210853U CN 208110191 U CN208110191 U CN 208110191U
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- photonic crystal
- polarization
- crystal fiber
- optical fiber
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Abstract
The utility model discloses a kind of tunable Polarization filters based on D type photonic crystal fiber, belong to special optical fiber, fiber optic communication, field of signal processing.The device is based on D type photonic crystal fiber (1) structure.The fuse (2) of photonic crystal fiber is surrounded by the airport (3) of periodic arrangement and is formed, and close to optical fiber surface.Metal electrode (4), electrooptical material (5), lower metal electrode (6) is respectively coated on the surface of D type photonic crystal fiber.Photonic crystal fiber symmetry is destroyed, and the birefringence effect of optical fiber is obvious.Due to the presence of metal, in the contact surface of metal and optical fiber, there are plasma wave waveguide modes, when a certain polarization mode is equal with plasma wave waveguide mode effective refractive index, two modes couple, the loss of polarization mode increases severely, and unaffected, device realization polarization filtering function is lost in another polarization mode.When applying voltage in metal electrode two sides, the characteristic of electrooptical material changes with external voltage, to change the coupled characteristic of polarization mode Yu plasma wave waveguide mode.By control voltage, it can be achieved that Polarization filter it is tunable.
Description
Technical field
The utility model relates to a kind of tunable Polarization filters based on D type photonic crystal fiber, belong to special light
Fibre, fiber optic communication, field of signal processing.
Background technique
The working principle of Polarization filter is mainly the polarization light loss difference according to different directions (X, Y), in certain wave
Strong point filters out the light of a certain polarization direction, to reach single polarization output of light.Polarization filter can be used for optical fiber polarizer,
The fields such as fiber optic communication, Fibre Optical Sensor are the important devices in optical-fiber network.
In recent years, the Polarization filter based on optical fiber structure is mainly according to the birefringence effect of optical fiber.Due to birefringent effect
The presence answered, the effective refractive index of different polarization direction mode and loss are different, are reached at fixed wave length by rationally designing
Filter function.However, for general single mode fiber, due to the limitation of structure and material, birefringence effect and modal loss
It is restricted, usually cannot achieve filtering out for specific polarization mode.
Photonic crystal fiber can obtain higher birefringent characteristic by flexible design, often be used to design polarization filtering
Device.Its cardinal principle is that certain thickness metal is deposited in the airport of photonic crystal fiber, in connecing for metal and optical fiber
Contacting surface can generate surface plasma waveguide mode.When a certain polarization mode is identical as the effective refractive index of surface plasmon modes
When, two-mode couples, and modal loss increases sharply, and another polarization mode is unaffected, reaches filtering out for polarization mode.
However, the device of this method design, cannot achieve tunable filtering, can not carry out the artificial selection of wave band, which has limited devices
Further apply.There is researcher by the filling liquid crystal in the airport of the photonic crystal fiber of deposited metal at present, passes through
Control ambient temperature reaches the tunable of Polarization filter.But this method is the air that metal and liquid are filled into photonic crystal
In the air, structure is complicated, manufacture difficulty is larger.In addition, the Polarization filter is regulated and controled by changing the method for temperature, device is to the external world
The dependence of environment is big, unstable and operating difficulties.
Utility model content
Problem to be solved in the utility model is to overcome manually to adjust currently based on the Polarization filter of photonic crystal fiber
The problem that control is difficult, device is unstable.A kind of tunable Polarization filter based on D type photonic crystal fiber is provided.
The technical solution of the utility model：
A kind of tunable Polarization filter based on D type photonic crystal fiber, belongs to special optical fiber, fiber optic communication, signal
Process field.The device is based on D type photonic crystals optical fiber structure.The fuse of photonic crystal fiber is enclosed by the airport of periodic arrangement
Around forming, and close to optical fiber surface.Metal electrode, electrooptical material, lower gold is respectively coated on the surface of D type photonic crystal fiber
Belong to electrode.
Photonic crystal fiber symmetry is destroyed, and the birefringence effect of optical fiber is obvious.Due to the presence of metal, metal with
There are surface plasma waveguide modes for the contact surface of optical fiber, when a certain polarization mode and plasma wave waveguide mode effective refractive index
When equal, two modes are coupled, and the loss of polarization mode increases severely, and the loss of another polarization mode is unaffected, and device is real
Existing polarization filtering function.When applying voltage in metal electrode two sides, the characteristic of electrooptical material changes with external voltage, to change
Become the coupled characteristic of polarization mode and plasma wave waveguide mode.By control voltage, it can be achieved that Polarization filter it is tunable.
The beneficial effects of the utility model are specific as follows：
This structure is based primarily upon the property of D type photonic crystal fiber, metal surface plasma waveguide and electrooptical material, realizes
Tunable polarization filtering.Polarization filter structure that this is tunable is simple, flexible design, simple to operation and be easy to and optical communication system
It is integrated.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the tunable Polarization filter based on D type photonic crystal fiber.
Fig. 2 is electrode two sides when not applying voltage, the losses of two polarization modes with wavelength change curve.
When Fig. 3 is that electrode two sides apply voltage, the losses of two polarization modes with wavelength change curve.
Specific embodiment
A kind of 1 to 3 pair of tunable Polarization filter based on D type photonic crystal fiber is further retouched with reference to the accompanying drawing
It states.
Embodiment one
A kind of cross section of the tunable Polarization filter based on D type photonic crystal fiber is as shown in Figure 1, the polarizer base
In 1 structure of D type photonic crystal fiber.The fuse 2 of photonic crystal fiber is surrounded by the airport 3 of periodic arrangement and is formed, and close
Optical fiber surface.Metal electrode 4, electrooptical material 5, lower metal electrode 6 is respectively coated on the surface of D type photonic crystal fiber.
In the implementation case when electrode two sides do not apply voltage, the losses of two polarization modes with wavelength change curve such as
Shown in Fig. 2.Since the symmetry of photonic crystal fiber is destroyed, photonic crystal fiber is with higher birefringent.Metal and light
There are metal surface plasma waveguide modes for fine contact surface, and couple respectively with X polarization mode with Y mode at different wave length,
The loss of polarization mode increases severely at this time.7 peak value of loss of X polarization mode is smaller, and 8 peak value of loss of Y polarization mode is larger, and X
The wavelength difference of polarization mode and the loss peak of Y polarization mode is larger.
Embodiment two
A kind of cross section of the tunable Polarization filter based on D type photonic crystal fiber is as shown in Figure 1, the polarizer base
In 1 structure of D type photonic crystal fiber.The fuse 2 of photonic crystal fiber is surrounded by the airport 3 of periodic arrangement and is formed, and close
Optical fiber surface.Metal electrode 4, electrooptical material 5, lower metal electrode 6 is respectively coated on the surface of D type photonic crystal fiber.
In the implementation case when electrode two sides apply voltage, the loss of two polarization modes is with the change curve of wavelength as schemed
Shown in 3.When electrode two sides apply voltage, the characteristic of electrooptical material causes the polarization transmitted in optical fiber with voltage change is applied
Mode changes, so that the loss peak of mode drifts about.Compared with Fig. 2, X polarization mode 9 is constant, Y polarization mode 10 loss
Curve changes, loss peak drift, to realize the tunable of filter.
Claims (3)
1. a kind of tunable Polarization filter based on D type photonic crystal fiber, it is characterised in that：Polarization filter is based on D type
Photonic crystal fiber (1) structure, the fuse (2) of photonic crystal fiber, the airport (3) by periodic arrangement is around forming, in D type
Metal electrode (4), electrooptical material (5), lower metal electrode (6) is respectively coated in the surface of photonic crystal fiber.
2. a kind of tunable Polarization filter based on D type photonic crystal fiber according to claim 1, feature exist
In：The fuse (2) of photonic crystal fiber is destroyed close to optical fiber surface, optical fiber symmetry, there is higher birefringence effect, due to
The presence of metal electrode (4,6), in the contact surface of optical fiber and metal, there are surface plasma waveguide modes, in specific wavelength
Place, when a certain polarization mode is equal with the effective refractive index of surface plasma waveguide mode, two modes are coupled, this is partially
The loss of vibration mode increases severely, and the loss of another polarization mode is unaffected, to reach polarization filtering function.
3. a kind of tunable Polarization filter based on D type photonic crystal fiber according to claim 1, feature exist
In：Electrooptical material (5) are coated between metal electrode above and below optical fiber surface, when applying voltage in metal electrode two sides, electric light
The characteristic of material changes with external voltage, and then causes the variation of polarization mode in optical fiber, by controlling voltage, realizes polarization
Filter it is tunable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820210853.1U CN208110191U (en) | 2018-02-07 | 2018-02-07 | A kind of tunable Polarization filter based on D type photonic crystal fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820210853.1U CN208110191U (en) | 2018-02-07 | 2018-02-07 | A kind of tunable Polarization filter based on D type photonic crystal fiber |
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| CN208110191U true CN208110191U (en) | 2018-11-16 |
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|---|---|---|---|
| CN201820210853.1U Expired - Fee Related CN208110191U (en) | 2018-02-07 | 2018-02-07 | A kind of tunable Polarization filter based on D type photonic crystal fiber |
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2018
- 2018-02-07 CN CN201820210853.1U patent/CN208110191U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181116 Termination date: 20220207 |