CN102436035B - Annular resonant cavity temperature drift compensation method and system thereof - Google Patents

Abstract

The invention discloses an annular resonant cavity temperature drift compensation method and a system thereof and relates to the integrated photoelectron technology field. The method comprises the following steps: S1. acquiring an increased temperature of the resonant cavity and calculating a variation of resonance wavelength redshift of a resonance ring; S2. determining an effective resonance coupling coefficient which can make blue shift of the resonance wavelength on the resonance ring; S3. establishing a corresponding relation between the effective resonance coupling coefficient of the resonant cavity and the variation of the blue shift of the resonance wavelength of the resonant cavity; S4. selecting a compensation resonance coupling coefficient corresponding to the variation of the resonance wavelength redshift according to the corresponding relation; S5. adjusting the effective resonance coupling coefficient to the compensation resonance coupling coefficient. In the invention, through adjusting the effective resonance coupling coefficient of the resonance ring, the resonance wavelength redshift of the resonant cavity caused by temperature change can be avoided and normal working can be performed.

Description

Ring resonator method for temperature drift compensation and system

Technical field

The present invention relates to integrated opto-electronic technical field, particularly a kind of ring resonator method for temperature drift compensation and system.

Background technology

At present, optical resonator has increasing application in fields such as communication, sensings.The transport property of resonator cavity has the advantages that wavelength is selected, and specific implementation has Fabry-Perot cavity, ring resonator etc.Wherein, ring resonator wavelength selectivity is comparatively sensitive, can differentiate the wavelength difference that differs 0.01nm.But under normal conditions, along with the rising of temperature, the refractive index of material can increase, and the resonance wavelength of resonator cavity moves to long wavelength's direction, is referred to as resonance spectrum " red shift ".Therefore, temperature variation has changed the wavelength selectivity of resonator cavity, affects its application performance.Therefore the thermally-stabilised significance that is improved resonant cavity device job stability.

At present in the research of the thermally-stabilised technical field of integrated optical device, be mainly divided into two schemes both at home and abroad, a kind of scheme is to adopt the material (being generally polymkeric substance) with negative thermo-optical coeffecient to add to overlay on waveguide core layer, form thermally-stabilised optical texture with positive thermo-optical coeffecient, as waveguide [1,2], ring resonator [3] etc.Another kind of scheme is to adopt special optical texture design, realizes heat-staple optical device, as MZI[4,5], toroidal cavity resonator [6] etc.Relatively two kinds of methods, front kind of method need to be introduced new material, may destroy the integrated processing compatibility of micro-nano photoelectron, but owing to can forming heat-staple waveguide, is applicable to all optical function devices; Rear kind of method has good processing compatibility, but need to design different organization plans for different function elements.In document [6], adopt the thermally-stabilised scheme of the auxiliary ring resonator of Mach Zehnder interferometer under specific temperature conditions, normally to work, practicality is poor.

List of references:

[1]W.N.Ye et al.，“Athermal High-index-contrast waveguide design”，IEEEPhotonics Technology Letters，20，(2008)885.

[2]V.Raghunathan，et al.，“Athermal operation of silicon waveguides：spectral，second order and footprint dependencies”，Opt.Express，18，(2010)17631.

[3]J.Teng，et al.“Athermal Silicon-on-insulator ring resonators by overlaying a polymer cladding on narrowed waveguides”，Opt.Express，17，(2009)14627.

[4]M.Uenuma，et al.，“Temoerature-independent silicon waveguide optical filter”，Opt.Lett.，34，(2009)599.

[5]B.Guha，et al.，“Minimizing temperature sensitivity of silicon Mach-Zehnder interferometers”，Opt.Express，18，(2010)1879.

[6]B.Guha，et al，“CMOS-compatible athermal silicon microring resonators”，Opt.Express，18，(2010)3487.

Summary of the invention

(1) technical matters that will solve

The technical problem to be solved in the present invention is: how to solve ring resonator in the situation that of temperature variation, cause the resonance wavelength red shift of resonator cavity and the problem that cannot normally work.

(2) technical scheme

For solving the problems of the technologies described above, the invention provides a kind of ring resonator method for temperature drift compensation, said method comprising the steps of:

S1: obtain the temperature that resonator cavity raises, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of described resonant ring;

S2: determine the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring according to the equivalent structure of described resonator cavity coupled zone;

S3: set up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

S4: select to compensate accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift according to described corresponding relation;

S5: described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

Preferably, the serve as reasons straight wave guide that intercouples and single disc waveguide composition of the structure of described resonator cavity.

Preferably, in step S5, by following steps, realize the adjustment of effective resonance coupling coefficient:

S511: the phase change value of calculating the equivalent structure of described resonator cavity coupled zone according to described compensation resonance coupling coefficient;

S512: according to the corresponding relation of U-shaped waveguide length in the equivalent structure of described phase change value and described resonator cavity coupled zone, calculate described U-shaped waveguide length;

S513: adjust U-shaped waveguide length in the equivalent structure of described resonator cavity coupled zone according to described U-shaped waveguide length, to realize the adjustment of effective resonance coupling coefficient.

Preferably, in step S511, by following formula, calculate the phase change value of the equivalent structure of described resonator cavity coupled zone,

$k_{\mathrm{eff}}=2r_c{k}_c\sqrt{a}\exp (i\·\mathrm{\Δ\θ})$

Wherein, k _efffor compensation resonance coupling coefficient, r _cfor U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone from coupling coefficient, k _cfor the cross-coupling coefficient of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, a is the transmission coefficient in U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, Δ θ is the phase change value of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, and i is constant.

Preferably, in step S512, by following formula, calculate described U-shaped waveguide length,

$\mathrm{\Δ\θ}=\frac{\mathrm{\Δ}{n}_{\mathrm{eff}}\·L}{\mathrm{\λ}}\·2\mathrm{\π}$

Wherein, Δ θ is the phase change value of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, λ, Δ n _effin the situation that temperature change amount is constant, be fixed value, L is U-shaped waveguide length.

Preferably, the structure of described resonator cavity straight wave guide, the first disc waveguide and the second disc waveguide composition of coupling of serving as reasons successively.

Preferably, in step S5, by following steps, realize the adjustment of effective resonance coupling coefficient:

S521: calculate two arm phase differential in the equivalent structure of described resonator cavity coupled zone according to described compensation resonance coupling coefficient;

S522: according to the poor corresponding relation of two arm lengths in the equivalent structure of described phase differential and described resonator cavity coupled zone, calculate described two arm lengths poor;

S523: poor according to two arm lengths in the equivalent structure of the described resonator cavity of the poor adjustment of described two arm lengths coupled zone, to realize the adjustment of effective resonance coupling coefficient.

Preferably, in step S521, by following formula, calculate the phase differential of two arms in the equivalent structure of described resonator cavity coupled zone,

$k_{\mathrm{eff}}=r_c{k}_c\sqrt{t_1^2+{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000100142690000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_2^2-2t_1{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000100142690000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_2\cos \left(\mathrm{\&Delta;\&theta;}\right)}$

Wherein, k _efffor compensation resonance coupling coefficient, r _cfor the beam splitting of two arms in the equivalent structure of described resonator cavity coupled zone/close bundle from coupling coefficient, k _cfor the beam splitting of two arms in the equivalent structure of described resonator cavity coupled zone/close bundle cross-coupling coefficient, t ₁and t ₂be respectively the transmission coefficient of two arms in the equivalent structure of described resonator cavity coupled zone, Δ θ is two arm phase differential in the equivalent structure of described resonator cavity coupled zone.

Preferably, in step S522, by following formula, calculate described two arm lengths poor,

$\mathrm{\&Delta;\&theta;}=\frac{\mathrm{\&Delta;}{n}_{\mathrm{eff}}\&CenterDot;\mathrm{\&Delta;L}}{\mathrm{\&lambda;}}\&CenterDot;2\mathrm{\&pi;}$

Wherein, Δ η is two arm phase differential in the equivalent structure of described resonator cavity coupled zone, λ, Δ n _effin the situation that temperature change amount is constant, be fixed value, Δ L is that in the equivalent structure of described resonator cavity coupled zone, two arm lengths are poor.

The invention also discloses a kind of ring resonator temperature drift compensation system, described system comprises:

Temperature acquisition module, the temperature raising for obtaining resonator cavity, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of described resonant ring;

Coupling coefficient determination module, for determining the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and according to the equivalent structure of described resonator cavity coupled zone, determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring;

Corresponding relation building module, for setting up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

Module is selected in compensation, for selecting according to described corresponding relation, compensates accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift;

Adjusting module, for described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

(3) beneficial effect

The present invention is by adjusting effective resonance coupling coefficient of resonant ring, solved because ring resonator is the temperature variation in the situation that, the problem that causes the resonance wavelength red shift of resonator cavity and cannot normally work, make the ring resonator can be the in the situation that of temperature variation, guaranteeing under the prerequisite of processing compatibility, optical transmission property (wavelength selectivity) that can retaining part wavelength is constant in wider wavelength coverage.

Accompanying drawing explanation

Fig. 1 is in the situation that resonator cavity temperature raises, and resonance wavelength produces the schematic diagram of red shift;

Fig. 2 is the spectral profile situation under different effective resonance coupling coefficient;

Fig. 3 produces after red shift in the resonance wavelength shown in Fig. 1, realizes the schematic diagram of blue shift;

Fig. 4 is according to the process flow diagram of the ring resonator method for temperature drift compensation of one embodiment of the present invention;

Fig. 5 is the structural representation of the ring resonator of embodiment 1;

Fig. 6 is the equivalent structure of the resonator cavity coupled zone of the ring resonator shown in Fig. 5;

Fig. 7 is the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

Fig. 8 is the structural representation of the ring resonator of embodiment 2;

Fig. 9 is the equivalent structure of the resonator cavity coupled zone of the ring resonator shown in Fig. 8;

Figure 10 is the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.

Basic conception of the present invention is: utilizes in the situation of ring resonator double resonance, and harmonic peak division, the harmonic peak in left side has the phenomenon of " blue shift ".Utilize this " blue shift " characteristic, the compensation temperature harmonic peak " red shift " causing that raises, thus realize temperature drift compensation.

Concrete condition as shown in Figure 1, take silicon materials as example, the thermo-optical coeffecient of silicon materials more greatly 1.8 × 10 ^-4/ K, the in the situation that of 1 ℃ of temperature change, the variations in refractive index 1.8 × 10 of silicon materials ^-4.In the Medium Wave Guide take silicon materials as sandwich layer, along with the variations in refractive index of material, its effective refractive index n _effalso can change thereupon.By resonance formula, can be obtained:

n _effL＝m·λ ₀ (1)

Wherein, the length that L is ring resonator, m is positive integer, λ ₀for resonance wavelength.

Under original state, (there is spike, i.e. a λ in the transmission spectral line of resonator cavity as shown in solid line in Fig. 1 ₀position).In the situation that temperature raises, effective refractive index generation Δ n _eff(Δ n _eff> 0) variation, resonance formula is rewritten as

(n _eff+Δn _eff)L＝m·(λ ₀+Δλ ₀) (2)

Wherein, Δ λ is resonance wavelength drift value (Δ λ > 0), and in Fig. 1 shown in dotted line, line drift (spike moves to right), occurs " red shift ".Therefore, resonator cavity cannot normally be worked.

In the situation that double resonance is coupled, the optical coupled coefficient between definition resonance is resonance coupling coefficient, for realizing the key parameters of temperature compensation in the present invention.In the situation that double resonance is coupled, originally single harmonic peak is split into two symmetrical harmonic peaks, the transmission spectral line obtaining as shown in Figure 2, represents respectively the spectral profile situation under different effective resonance coupling coefficient, the position of visible harmonic peak be have visibly different.We pay close attention to the harmonic peak in the rear left side of division, at resonance coupling coefficient r ₂in situation about reducing, resonance wavelength moves toward short wavelength's direction, and generation " blue shift ".

Therefore, utilize this principle to can be used to the resonance line drift that compensation temperature causes, as shown in Figure 3, after blue shift, harmonic peak position remains unchanged.

Fig. 4 is according to the process flow diagram of the ring resonator method for temperature drift compensation of one embodiment of the present invention, said method comprising the steps of:

S1: obtain the temperature that resonator cavity raises, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of described resonant ring;

S2: determine the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring according to the equivalent structure of described resonator cavity coupled zone;

S3: set up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

S4: select to compensate accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift according to described corresponding relation;

S5: described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

Embodiment 1

The serve as reasons straight wave guide that intercouples and single disc waveguide composition of the structure of resonator cavity as described in Figure 5, the method for the present embodiment comprises the following steps:

S101: obtain the temperature that resonator cavity raises, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of described resonant ring; Take the wide single mode silicon waveguide of 500nm as example, its effective refractive index variation with temperature is

in temperature, raise 5 ℃ in the situation that, the effective refractive index of waveguide changes Δ n _eff=1.04 × 10-3, determines spectral line " red shift " Δ λ=0.653nm by formula (1) (2);

S102: determine the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring according to the equivalent structure of described resonator cavity coupled zone; Ring resonator carries out the coupling input and output of energy by straight wave guide.The light field E of left side input ₁enter after straight wave guide, by coupling (the cross-coupling coefficient κ of curved waveguide in straight wave guide and ring ₁, from coupling coefficient r ₁), the light field of straight wave guide coupling output is E ₂, and in curved waveguide, corresponding input and output light field is respectively E ₃and E ₄.The light field of moving in ring, through reflector element, part light field is reflected, the transmission of part light field, reflection coefficient is κ ₂, transmission coefficient is r ₂.Afterwards, reflected light and transmitted light form respectively the resonance of clockwise and counterclockwise both direction, and two resonance intercouple by reflector element, the equivalent structure of described resonator cavity coupled zone as shown in Figure 6, therefore, determine resonance coupling coefficient by reflector element reflection coefficient determine, be coefficient κ ₂;

S103: set up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity, as shown in Figure 7, " the K in figure _eff" be effective resonance coupling coefficient;

S104: select to compensate accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift according to corresponding relation as shown in Figure 7; In temperature, raise 5 ℃ in the situation that, by κ ₂" blue shift " causing ,-Δ λ=-0.653nm, what corresponding needs were selected is the part of solid line in Fig. 7.

S105: described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

In step S105, by following steps, realize the adjustment of effective resonance coupling coefficient:

S511: the phase change value of calculating the equivalent structure of described resonator cavity coupled zone according to described compensation resonance coupling coefficient;

S512: according to the corresponding relation of U-shaped waveguide length in the equivalent structure of described phase change value and described resonator cavity coupled zone, calculate described U-shaped waveguide length;

S513: adjust U-shaped waveguide length in the equivalent structure of described resonator cavity coupled zone according to described U-shaped waveguide length, to realize the adjustment of effective resonance coupling coefficient; In temperature, raise 5 ℃ in the situation that, when Δ θ=0.26rad, can provide resonance line " blue shift " Δ λ=-0.653.According to can be calculated, the length L=61.7 μ m of the U-shaped waveguide now needing.。

Preferably, in step S511, by following formula, calculate the phase change value of the equivalent structure of described resonator cavity coupled zone,

$k_{\mathrm{eff}}=2r_c{k}_c\sqrt{a}\exp (i\&CenterDot;\mathrm{\&Delta;\&theta;})$

Wherein, k _efffor compensation resonance coupling coefficient, r _cfor U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone from coupling coefficient, k _cfor the cross-coupling coefficient of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, a is that the transmission coefficient in U-shaped waveguide (is supposed lossless in the equivalent structure of described resonator cavity coupled zone, a=1), Δ θ is the phase change value of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, and i is constant.

Preferably, in step S512, by following formula, calculate described U-shaped waveguide length,

$\mathrm{\&Delta;\&theta;}=\frac{\mathrm{\&Delta;}{n}_{\mathrm{eff}}\&CenterDot;\mathrm{\&Delta;L}}{\mathrm{\&lambda;}}\&CenterDot;2\mathrm{\&pi;}$

Wherein, Δ θ is the phase change value of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, λ, Δ n _effin the situation that temperature change amount is constant, be fixed value, L is U-shaped waveguide length.

Embodiment 2

As shown in Figure 8, the structure of described resonator cavity serve as reasons successively straight wave guide, the first disc waveguide and the second disc waveguide composition of coupling, the method for the present embodiment comprises the following steps:

S201: obtain the temperature that resonator cavity raises, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of described resonant ring; Take the wide single mode silicon waveguide of 500nm as example, its effective refractive index variation with temperature is in temperature, raise 5 ℃ in the situation that, the effective refractive index of waveguide changes Δ n _eff=1.04 × 10-3, determines spectral line " red shift " Δ λ=0.653nm by formula (1) (2);

S202: determine the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring according to the equivalent structure of described resonator cavity coupled zone; Ring resonator carries out the coupling input and output of energy by straight wave guide.The light field E of left side input ₁enter after straight wave guide, by coupling (the cross-coupling coefficient κ of curved waveguide in straight wave guide and the first disc waveguide Ring I ₁, from coupling coefficient r ₁), the light field of straight wave guide coupling output is E ₂, and in curved waveguide, corresponding input and output light field is respectively E ₃and E ₄.The light field of moving in Ring I, through coupling (the cross-coupling coefficient κ of curved waveguide in curved waveguide and the second disc waveguide Ring II in Ring I ₂, from coupling coefficient r ₂) afterwards, be coupled with the light field in Ring II, the input and output light field of Ring I is respectively E ₆and E ₅, the input and output light field of Ring II is respectively E ₈and E ₇, the equivalent structure of described resonator cavity coupled zone as shown in Figure 9, therefore, determines that resonance coupling coefficient, by the structures shape in the dotted line frame between two disc waveguides, is coefficient κ ₂.Now original state resonance wavelength is λ ₀, now R=5 μ m, r ₁=0.99.

S203: set up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity, as shown in figure 10, " the K in figure _eff" be effective resonance coupling coefficient;

S204: select to compensate accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift according to described corresponding relation; In temperature, raise 5 ℃ in the situation that, by κ ₂" blue shift " causing ,-Δ λ=-0.653nm, what corresponding needs were selected is the part of solid line in Figure 10.

S205: described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

In step S205, by following steps, realize the adjustment of effective resonance coupling coefficient:

S521: calculate two arm phase differential in the equivalent structure of described resonator cavity coupled zone according to described compensation resonance coupling coefficient;

S522: according to the poor corresponding relation of two arm lengths in the equivalent structure of described phase differential and described resonator cavity coupled zone, calculate described two arm lengths poor;

S523: poor according to two arm lengths in the equivalent structure of the described resonator cavity of the poor adjustment of described two arm lengths coupled zone, to realize the adjustment of effective resonance coupling coefficient; In temperature, raise 5 ℃ in the situation that, when Δ θ=0.26rad, can provide resonance line " blue shift "-Δ λ=-0.653nm.According to can be calculated, the poor Δ L=61.7 of the two arms μ m now needing.

Preferably, in step S521, by following formula, calculate the phase differential of two arms in the equivalent structure of described resonator cavity coupled zone,

$k_{\mathrm{eff}}=r_c{k}_c\sqrt{t_1^2+{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000100142690000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_2^2-2t_1{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000100142690000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_2\cos \left(\mathrm{\&Delta;\&theta;}\right)}$

Wherein, k _efffor compensation resonance coupling coefficient, r _cfor the beam splitting of two arms in the equivalent structure of described resonator cavity coupled zone/close bundle from coupling coefficient, k _cfor the beam splitting of two arms in the equivalent structure of described resonator cavity coupled zone/close bundle cross-coupling coefficient, t ₁and t ₂be respectively two arms in the equivalent structure of described resonator cavity coupled zone transmission coefficient (suppose lossless, t ₁=t ₂=1), Δ θ is two arm phase differential in the equivalent structure of described resonator cavity coupled zone.

Preferably, in step S522, by following formula, calculate described two arm lengths poor,

$\mathrm{\&Delta;\&theta;}=\frac{\mathrm{\&Delta;}{n}_{\mathrm{eff}}\&CenterDot;\mathrm{\&Delta;L}}{\mathrm{\&lambda;}}\&CenterDot;2\mathrm{\&pi;}$

Wherein, Δ θ is two arm phase differential in the equivalent structure of described resonator cavity coupled zone, λ, Δ n _effin the situation that temperature change amount is constant, be fixed value, Δ L is that in the equivalent structure of described resonator cavity coupled zone, two arm lengths are poor.

The invention also discloses a kind of ring resonator temperature drift compensation system, described system comprises:

Temperature acquisition module, the temperature raising for obtaining resonator cavity, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of described resonant ring;

Coupling coefficient determination module, for determining the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and according to the equivalent structure of described resonator cavity coupled zone, determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring;

Corresponding relation building module, for setting up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

Module is selected in compensation, for selecting according to described corresponding relation, compensates accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift;

Adjusting module, for described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. a ring resonator method for temperature drift compensation, is characterized in that, said method comprising the steps of:

S1: obtain the temperature that resonator cavity raises, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of resonant ring;

S2: determine the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring according to the equivalent structure of described resonator cavity coupled zone;

S3: set up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

S4: select to compensate accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift according to described corresponding relation;

S5: described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

2. the method for claim 1, is characterized in that, the structure of described resonator cavity the serve as reasons straight wave guide that intercouples and single disc waveguide composition.

3. method as claimed in claim 2, is characterized in that, realizes the adjustment of effective resonance coupling coefficient in step S5 by following steps:

S511: the phase change value of calculating the equivalent structure of described resonator cavity coupled zone according to described compensation resonance coupling coefficient;

S512: according to the corresponding relation of U-shaped waveguide length in the equivalent structure of described phase change value and described resonator cavity coupled zone, calculate described U-shaped waveguide length;

S513: adjust U-shaped waveguide length in the equivalent structure of described resonator cavity coupled zone according to described U-shaped waveguide length, to realize the adjustment of effective resonance coupling coefficient.

4. method as claimed in claim 3, is characterized in that, calculates the phase change value of the equivalent structure of described resonator cavity coupled zone in step S511 by following formula,

Wherein, k _efffor compensation resonance coupling coefficient, r _cfor U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone from coupling coefficient, k _cfor the cross-coupling coefficient of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, a is the transmission coefficient in U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, Δ θ is the phase change value of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, and i is constant.

5. the method as described in claim 3 or 4, is characterized in that, in step S512, by following formula, calculates described U-shaped waveguide length,

Wherein, Δ θ is the phase change value of U-shaped waveguide in the equivalent structure of described resonator cavity coupled zone, Δ n _efffor waveguide effective refractive index change amount; λ, Δ n _effin the situation that temperature change amount is constant, be fixed value, L is U-shaped waveguide length.

6. the method for claim 1, is characterized in that, the structure of described resonator cavity serve as reasons successively straight wave guide, the first disc waveguide and the second disc waveguide composition of coupling.

7. method as claimed in claim 6, is characterized in that, realizes the adjustment of effective resonance coupling coefficient in step S5 by following steps:

S521: calculate two arm phase differential in the equivalent structure of described resonator cavity coupled zone according to described compensation resonance coupling coefficient;

S522: according to the poor corresponding relation of two arm lengths in the equivalent structure of described phase differential and described resonator cavity coupled zone, calculate described two arm lengths poor;

S523: poor according to two arm lengths in the equivalent structure of the described resonator cavity of the poor adjustment of described two arm lengths coupled zone, to realize the adjustment of effective resonance coupling coefficient.

8. method as claimed in claim 7, is characterized in that, calculates the phase differential of two arms in the equivalent structure of described resonator cavity coupled zone in step S521 by following formula,

Wherein, k _efffor compensation resonance coupling coefficient, r _cfor the beam splitting of two arms in the equivalent structure of described resonator cavity coupled zone/close bundle from coupling coefficient, k _cfor the beam splitting of two arms in the equivalent structure of described resonator cavity coupled zone/close bundle cross-coupling coefficient, t ₁and t ₂be respectively the transmission coefficient of two arms in the equivalent structure of described resonator cavity coupled zone, Δ θ is two arm phase differential in the equivalent structure of described resonator cavity coupled zone.

9. method as claimed in claim 7 or 8, is characterized in that, calculates described two arm lengths poor in step S522 by following formula,

Wherein, Δ θ is two arm phase differential in the equivalent structure of described resonator cavity coupled zone, Δ n _efffor waveguide effective refractive index change amount; λ, Δ n _effin the situation that temperature change amount is constant, be fixed value, Δ L is that in the equivalent structure of described resonator cavity coupled zone, two arm lengths are poor.

10. a ring resonator temperature drift compensation system, is characterized in that, described system comprises:

Temperature acquisition module, the temperature raising for obtaining resonator cavity, and calculate because temperature raises the variable quantity of the resonance wavelength red shift of resonant ring;

Coupling coefficient determination module, for determining the equivalent structure of described resonator cavity coupled zone according to the structure of described resonator cavity, and according to the equivalent structure of described resonator cavity coupled zone, determine effective resonance coupling coefficient that can make described resonance wavelength blue shift on described resonant ring;

Corresponding relation building module, for setting up the corresponding relation between effective resonance coupling coefficient of described resonator cavity and the variable quantity of the resonance wavelength blue shift of described resonator cavity;

Module is selected in compensation, for selecting according to described corresponding relation, compensates accordingly resonance coupling coefficient with the variable quantity of described resonance wavelength red shift;

Adjusting module, for described effective resonance coupling coefficient is adjusted to described compensation resonance coupling coefficient, so that the variable quantity of described resonance wavelength red shift and the variable quantity of described resonance wavelength blue shift are offseted.

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