CN103837935B - Cascade optical waveguide filter - Google Patents

Abstract

The present invention relates to a kind of cascade optical waveguide filter, including upper waveguide and lower waveguide, it is air layer (3) between upper waveguide and lower waveguide, it is characterized in that: the structure of lower waveguide is, be from top to bottom followed successively by the first silverskin (4), PMN PT ceramic layer (5), the second silverskin (6)；Upper waveguide is made up of waveguide, high resin material layer, waveguide is positioned at middle part, first high resin material layer (1), the second high resin material layer (8) are symmetricly set in the both sides of waveguide, the upper symmetry of first high resin material layer (1), the second high resin material layer (8) has intilted first light hole (2), the second light hole (9), waveguiding structure in the middle part of upper waveguide is, is from top to bottom followed successively by the 3rd silverskin (7), the 2nd PMN PT ceramic layer (10), the 4th silverskin (11)；First light hole (2), the radius of the second light hole (9) are 0.5mm, and the first light hole (2), the second light hole (9) and vertical direction angle are 2.575 °.

Description

Cascade optical waveguide filter

Technical field

The present invention relates to a kind of cascade optical waveguide filter.

Background technology

Existing optical waveguide filter structure is complex, and loss is relatively big, and filter effect is inadequate Preferable.

Summary of the invention

The goal of the invention of the present invention is to provide a kind of cascade optical waveguide filter, simple in construction, filter Ripple is effective.

Realize the technical scheme of the object of the invention:

A kind of cascade optical waveguide filter, including upper waveguide and lower waveguide, upper waveguide and lower waveguide it Between be air layer (3), it is characterised in that: the structure of lower waveguide is, is from top to bottom followed successively by One silverskin (4), a PMN-PT ceramic layer (5), the second silverskin (6)；Upper waveguide is by ripple Lead, high resin material layer is constituted, and waveguide is positioned at middle part, the first high resin material layer (1), the Two high resins material layer (8) are symmetricly set in the both sides of waveguide, the first high resin material layer (1), The upper symmetry of second high resin material layer (8) have intilted first light hole (2), second Light hole (9), the waveguiding structure in the middle part of upper waveguide is, be from top to bottom followed successively by the 3rd silverskin (7), 2nd PMN-PT ceramic layer (10), the 4th silverskin (11)；First light hole (2), second The radius of light hole (9) is 0.5mm, and the first light hole (2), the second light hole (9) are with perpendicular Straight angular separation is 2.575 °；When a PMN-PT ceramic layer (5), the 2nd PMN-PT ceramic layer (10) thickness, refractive index and the first silverskin (4), the 4th silverskin (11) dielectric constant are equal During for constant, Gu Si-Han Xin displacement changes with wavelength change, the widest wave-length coverage light from When first light hole (2) is incident, when wavelength changes to 859.673nm from 859.630nm, Being 3.318mm through triple reflection Gu Si-Han Xin displacement, the light of the most a certain wavelength leads to light from second Hole (9) is penetrated, and the light of other wavelength can not lead to from second due to Gu Si-Han Xin displacement difference Unthreaded hole (9) penetrates, thus realizes filtering.

Upper waveguide, the length of lower waveguide are 6mm, and wherein going up the waveguide length in the middle part of waveguide is 3mm, The thickness of air layer is 1mm.

The invention have the benefit that

Under the present invention, waveguide and upper waveguide are all made up of PMN-PT pottery and silverskin, upper waveguide Both sides are provided with opaque high resin material layer, and on the high resin material layer of both sides, symmetry has logical light Hole, i.e. light well and light hole, light is entered air layer by light well, through at lower waveguide and upper ripple After the thin silverskin reflection led, light hole reflect away, when thickness, refractive index and the silver of ducting layer When film dielectric constant is constant, according to the light ability of Gu Si-Han Xin displacement theory, only specific wavelength Reflect away from light hole, thus realize filtering.Present configuration is simple, filters with existing fiber waveguide Ripple device is compared, and has more preferably filter effect.

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention.

Detailed description of the invention

As it is shown in figure 1, be air layer 3 between upper waveguide and lower waveguide, the structure of lower waveguide is, From top to bottom it is followed successively by first silverskin the 4, the oneth PMN-PT ceramic layer the 5, second silverskin 6；Upper ripple Leading and be made up of waveguide, high resin material layer, waveguide is positioned at the middle part of waveguide, and waveguiding structure is, From top to bottom it is followed successively by the 3rd silverskin the 7, the 2nd PMN-PT ceramic layer the 10, the 4th silverskin 11, the One high resin material layer the 1, second high resin material layer 8 is symmetricly set in the both sides of waveguide, and first On high resin material layer the 1, second high resin material layer 8, symmetry has intilted first and leads to light Hole the 2, second light hole 9, during enforcement, the radius of first light hole the 2, second light hole 9 is 0.5mm, first light hole the 2, second light hole 9 is 2.575 ° with vertical direction angle.During enforcement, Upper waveguide, the length of lower waveguide are 6mm, and wherein going up the waveguide length in the middle part of waveguide is 3mm, empty The thickness of gas-bearing formation is 1mm.

The present invention is based on Gu Si-Han XinDisplacement (S) principle realizes.

The incidence point of light and pip be not at same position, the distance between incidence point and pip It is referred to as Gu Si-Han XinDisplacement (S).Gu Si-Han Xin displacement S can approximate table It is shown as

$S=-\frac{2\mathrm{Im}\left({\mathrm{\Δ\β}}^L\right)}{\mathrm{Im}{\left({\mathrm{\β}}^o\right)}^2-\mathrm{Im}{\left({\mathrm{\Δ\β}}^L\right)}^2}cos\mathrm{\θ}---\left(1\right)$

In formula, θ is resonance matching angle, Im (β^o) it is referred to as the intrinsic loss of waveguide and Im (Δ β^L) it is referred to as waveguide Radiation loss, and with the wavelength of incident illumination, a PMN-PT ceramic layer (ducting layer) 5, The thickness of two PMN-PT ceramic layers 10, refractive index and the first silverskin the 4, the 4th silverskin 11 dielectric constant Relevant, it can be expressed as

$\mathrm{Im}\left({\mathrm{\β}}^o\right)={\mathrm{\ϵ}}_{i2}\frac{k_o^2{\mathrm{\κ}}_1^2}{2{\mathrm{\α}}_2{\mathrm{\βh}}_{1eff}({\mathrm{\κ}}_1^2+{\mathrm{\α}}_2^2)}---\left(2\right)$

$\mathrm{Im}\left({\mathrm{\Δ\β}}^L\right)=\frac{{\mathrm{\κ}}_1}{2{\mathrm{\βh}}_{1eff}}{e}^{-{\mathrm{\α}}_2{h}_1}sin2{\mathrm{\φ}}_{12}sin2{\mathrm{\φ}}_{20}---\left(3\right)$

Wherein

${\mathrm{\φ}}_{12}={\mathrm{\φ}}_{20}=\arctan \left(\mathrm{\ρ}\frac{{\mathrm{\α}}_2}{{\mathrm{\κ}}_1}\right)---\left(6\right)$

(4) h and in (5) formula₁For the thickness of ducting layer, h_1effThe effective thickness of ducting layer, according to (1) Formula is it can be seen that work as intrinsic loss and be equal to radiation loss, i.e. have

Im(β^o)=Im (Δ β^L) (7)

Time, maximum Gu Si-Han Xin displacement can be obtained；Meanwhile, when other amounts are constant, resonance matching angle is more Little, then Gu Si-Han Xin displacement is the biggest.If intrinsic loss is more than radiation loss, i.e. have Im(β^o) ＞ Im (Δ β^L) time, Gu Si-Han Xin displacement S ＜ 0；And as Im (β^o) ＜ Im (Δ β^L) time, Gu Si- The Chinese glad displacement S ＞ 0.For the present embodiment, on the first silverskin 4 and the 4th silverskin 11 totally three times Reflection, owing to two waveguiding structures are identical, the Gu Si-Han Xin displacement S of every secondary reflection with identical, Therefore, total Gu Si-Han Xin bit shift is 3S.

Above-mentioned Gu Si-Han XinDisplacement (S) principle and correlation formula, derivation are equal Belong to prior art.

By formula (1), when PMN-PT ceramic layer (ducting layer) the 5, the 2nd PMN-PT makes pottery The thickness of enamel coating 10, refractive index and the first silverskin the 4, the 4th silverskin 11 dielectric constant are constant Time, Gu Si-Han Xin displacement changes with wavelength change, and the light in the widest wave-length coverage leads to from first When unthreaded hole 2 is incident, when wavelength changes to 859.673nm from 859.630nm, through triple reflection Gu Si-Han Xin displacement is 3.318mm, and the light of the most a certain wavelength penetrates from the second light hole 9, The light of other wavelength can not penetrate from the second light hole 9 due to Gu Si-Han Xin displacement difference, from And realize filtering.

Claims (2)

1. a cascade optical waveguide filter, including upper waveguide and lower waveguide, upper waveguide And be air layer (3) between lower waveguide, it is characterised in that: the structure of lower waveguide is, From top to bottom be followed successively by the first silverskin (4), a PMN-PT ceramic layer (5), Two silverskin (6)；Upper waveguide is made up of, during waveguide is positioned at waveguide, high resin material layer Portion, the first high resin material layer (1), the second high resin material layer (8) are symmetrical arranged In the both sides of waveguide, the first high resin material layer (1), the second high resin material layer (8) Upper symmetry has intilted first light hole (2), the second light hole (9), on Waveguiding structure in the middle part of waveguide is, be from top to bottom followed successively by the 3rd silverskin (7), second PMN-PT ceramic layer (10), the 4th silverskin (11)；First light hole (2), The radius of two light holes (9) is 0.5mm, the first light hole (2), the second light hole (9) with vertical direction angle be 2.575 °；

When a PMN-PT ceramic layer (5), the 2nd PMN-PT ceramic layer (10) Thickness, refractive index and the first silverskin (4), the 4th silverskin (11) dielectric constant are During constant, Gu Si-Han Xin displacement changes with wavelength change, in the widest wave-length coverage Light is when the first light hole (2) is incident, when wavelength changes to from 859.630nm During 859.673nm, be 3.318mm through triple reflection Gu Si-Han Xin displacement, only certain The light of one wavelength from the second light hole (9) penetrate, the light of other wavelength due to Gu Si- The glad displacement of the Chinese is different and can not penetrate from the second light hole (9), thus realizes filtering.

Cascade optical waveguide filter the most according to claim 1, it is characterised in that: Upper waveguide, the length of lower waveguide are 6mm, wherein go up the waveguide length in the middle part of waveguide and are 3mm, the thickness of air layer is 1mm.