CN114253041B - Optical frequency comb generation method and device based on filtering effect - Google Patents
Optical frequency comb generation method and device based on filtering effect Download PDFInfo
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- CN114253041B CN114253041B CN202010994207.0A CN202010994207A CN114253041B CN 114253041 B CN114253041 B CN 114253041B CN 202010994207 A CN202010994207 A CN 202010994207A CN 114253041 B CN114253041 B CN 114253041B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3511—Self-focusing or self-trapping of light; Light-induced birefringence; Induced optical Kerr-effect
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
Abstract
The invention belongs to the technical field of optical frequency combs and discloses a method and a device for generating an optical frequency comb based on a filtering effect. According to the invention, the mode coupling effect is introduced on the basis of the coupling structure of the two micro-ring resonant cavities, and the loss is introduced into the second micro-ring resonant cavity, so that the local dispersion introduced by the mode coupling effect is weakened or even disappears, and a filtering effect is introduced, thereby generating the optical frequency comb with smoother envelope.
Description
Technical Field
The invention belongs to the technical field of optical frequency combs, and particularly relates to a method and a device for generating an optical frequency comb based on a filtering effect.
Background
The rapid growth of the communications industry, accompanied by a greatly increased demand for communication capacity, is the gradual replacement of electrical interconnects that are far from meeting the user-related needs. The optical frequency comb technology based on the Kerr micro-ring resonant cavity can realize the functions of frequency domain accurate measurement, optical soliton transmission, optical communication capacity improvement and the like, and the micro-ring resonant cavity has the advantages of small enough size, very low power consumption, mature manufacturing process and the like, so that how to promote the generation of the micro-cavity optical frequency comb becomes a research hotspot in the related field. In 2007, p.del' Haye and his team published an article "Optical frequency comb generation from a monolithic micro-resonator" in the journal of Nature, which reports a generation scheme of an Optical frequency comb based on a high-Q-value kel micro-ring resonator, and the scheme utilizes the characteristics of low loss and small mode area of the high-Q-value micro-ring resonator to reduce the threshold value of nonlinear Optical effect generated in a ring, so as to obtain an Optical frequency comb with a wide wavelength range and stable comb tooth intervals, as shown in fig. 1.
In 2015, xiaoxiao Xue and his team published in "Laser Photonics Review" this journal by an article "Normal-dispersion microcombs enabled by controllable mode interactions", which proposed a scheme of re-coupling a double-coupled microresonator of a previous ring on a ring basis, by which coupling between fundamental modes of two rings was intentionally introduced to change local dispersion, control modal interactions, so that kerr optical frequency combs could be generated in a Normal dispersion medium, generation of microcavity optical frequency combs, selection of repetition frequencies, and acquisition of mode locking were achieved by on-chip micro heaters coupled to silicon nitride microcavities. The scheme provides a reliable design for optical frequency comb generation in a normal dispersion medium, and has a promoting effect on the generation of optical frequency combs in a wavelength range mainly based on normal matter dispersion, such as a visible light range.
In 2017, chengying Bao and his team published in Optica, an article "Spatial mode-interaction induced single-soliton generation in microresonators" which proposed the generation of a Spatial mode coupling-induced single soliton, i.e., an optical frequency comb, in a microcavity. The two micro-rings with the same parameters are provided experimentally, but the mode coupling strengths are different, so that the two micro-rings can easily reach a single soliton state after the mode coupling is introduced and the local dispersion is changed, and the degree of local distortion on the frequency spectrum of the ring with the high mode coupling strength is larger than that of the ring with the low mode coupling strength. In addition, they also verified in simulation that the single soliton state can be easily reached after introducing mode coupling.
In 2019, jianxing Pan and his team published in Journal of light Technology in the article "Fundamental and Third Harmonic Mode Coupling Induced guided Single wavelength solutions Generation in Kerr resonators" which proposed a passive mechanism based on Third Harmonic Mode Coupling Induced guan optical frequency comb Generation. They verified that in the anomalous dispersion region, with appropriate coupling strengths of fundamental frequency and third harmonic and slight phase mismatch, only the detuning of the pump as continuous light needs to be simply scanned, and the balance between the phase mismatch and third harmonic coupling strengths can be obtained, ensuring the generation of deterministic solitons, and thus promoting the generation of optical frequency combs in a single soliton state.
The two methods for facilitating optical frequency comb generation from the above introduced-mode coupling are the first one in which the coupling of modes in the two ring cavities is introduced by the coupling of the two ring cavities or the coupling of different order modes in the ring, and the second one in which the generation of the optical frequency comb is facilitated by the introduction of the coupling between higher harmonics and fundamental waves in the ring. Both of these methods essentially promote the generation of the optical frequency comb in the single soliton state by the change of local dispersion caused by mode coupling, and work in the hatched coupling region shown in fig. 2 (a), that is, the region of mode splitting caused by mode coupling, and the dispersion curve is similar to that shown in fig. 2 (b), and the envelope of the optical frequency comb in the obtained single soliton state will also generate a certain distortion in the region where mode coupling occurs due to the influence of the change of local dispersion, as shown in fig. 3, and is not very smooth, which is not favorable for the application of the optical frequency comb.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method and a device for generating an optical frequency comb based on a filtering effect, and aims to solve the problem that the optical frequency comb in a single soliton state generated in the prior art generates certain distortion in a mode coupling generation region due to the influence of local dispersion change, so that the envelope of the optical frequency comb is not smooth.
The invention provides a filtering effect-based optical frequency comb generation method in a single soliton state, which comprises the following steps of: introducing a mode coupling effect by coupling the first micro-ring resonant cavity with the straight waveguide and introducing the second micro-ring resonant cavity to be coupled with the first micro-ring resonant cavity; the loss is introduced into the second micro-ring resonant cavity, so that the local dispersion introduced by the mode coupling effect is weakened or even disappears, the transmittance at the frequency of the coupling mode is increased to a certain extent, which is equivalent to introducing the optical filtering effect into the optical field in the first micro-ring resonant cavity, thereby promoting the generation of the optical frequency comb in the single soliton state, and the envelope of the generated optical frequency comb is smoother compared with the envelope of the optical frequency comb generated based on the mode coupling effect in the prior art.
And introducing loss with controllable size into the second micro-ring resonant cavity in a mode of adding electrodes or illuminating or introducing new waveguide to be coupled with the second micro-ring resonant cavity.
When the point light source is adopted to introduce the loss with controllable size to the second micro-ring resonant cavity, the number of absorbed photons is adjusted by adjusting the intensity of the point light source, so that the loss of the second micro-ring resonant cavity is adjusted.
When pumping light is input at the input end of the waveguide, the pumping light is transmitted and coupled into the first micro-ring resonant cavity through the waveguide, the pumping light resonates in the first micro-ring resonant cavity and forms frequency sparse teeth at equal intervals under the nonlinear action, and the size of the intervals is determined by the free spectral range of the first micro-ring resonant cavity.
The invention also provides a filtering effect-based optical frequency comb generating device, which comprises: the waveguide comprises a first micro-ring resonant cavity, a straight waveguide and a second micro-ring resonant cavity, wherein the second micro-ring resonant cavity is coupled with the first micro-ring resonant cavity; the controllable loss is introduced into the second micro-ring resonant cavity, so that the local dispersion introduced by the mode coupling effect is weakened or even disappears, the transmittance at the frequency of the coupling mode is increased to a certain extent, and the optical filtering effect is equivalently introduced into the optical field in the first micro-ring resonant cavity, so that the generation of the optical frequency comb with smoother envelope in a single soliton state is promoted.
When the micro-ring resonant cavity works, pumping light is input at the input end of the waveguide, is transmitted and coupled into the first micro-ring resonant cavity through the waveguide, resonates in the first micro-ring resonant cavity and forms frequency sparse teeth which are equidistant and have smoother envelopes under the action of nonlinearity and dispersion.
Still further, it includes: and the loss introducing unit is used for introducing loss into the second micro-ring resonant cavity so that local dispersion introduced by mode coupling effect is weakened or even disappears.
Further, the loss introducing unit includes: the two electrodes are respectively arranged at a p region and an n region of a second micro-ring resonant cavity manufactured on the basis of a p-i-n structure waveguide, a forward bias voltage is applied to the pn junction, current carriers can be injected into the second micro-ring resonant cavity, the absorption loss of near infrared light is increased by utilizing the current carrier absorption effect, so that the loss of the second micro-ring resonant cavity is increased, and the loss of the second micro-ring resonant cavity is controlled by adjusting the magnitude of the applied forward bias voltage.
Further, the loss introducing unit includes: the point light source is arranged above the second micro-ring resonant cavity, and an emergent light spot of the point light source can irradiate on the second micro-ring resonant cavity, so that a current carrier is generated due to the absorption of visible light, the absorption loss of near infrared light is increased by utilizing the absorption effect of the current carrier, the loss of the second micro-ring resonant cavity is increased, and the quantity of absorbed photons is adjusted by adjusting the intensity of the point light source, so that the loss of the second micro-ring resonant cavity is adjusted.
Further, the loss introducing unit includes: the waveguide and the electrode are provided with a new waveguide which is coupled with the second micro-ring resonant cavity, the electrode is arranged in a coupling area of the second micro-ring resonant cavity and the new waveguide, the refractive index of the coupling area is changed by heating the electrode and utilizing the thermo-optical effect, so that the coupling coefficient of the new waveguide and the second micro-ring resonant cavity is changed, and the loss of the second micro-ring resonant cavity is adjusted.
Compared with the prior art, the technical scheme provided by the invention has the advantages that the mode coupling effect is introduced based on the coupling structure of the two micro-ring resonant cavities, the controllable loss is introduced into the second micro-ring resonant cavity, the change of the local dispersion introduced by the original mode coupling effect is greatly weakened or even eliminated, the transmissivity at the coupling mode frequency is increased to a certain extent compared with the transmissivity at the frequency of the original first micro-ring resonant cavity, namely a certain filtering effect is introduced, so that the generation of the microcavity optical frequency comb in a single soliton state is promoted, and the envelope of the microcavity optical frequency comb is smoother compared with the optical frequency comb generated by mode coupling.
Drawings
FIG. 1 is a schematic diagram of the prior art provision of a single micro-ring resonator optical frequency comb generation;
FIG. 2 (a) is a graph depicting the change in the imaginary part of the eigenfrequency (dispersion) at the coupled mode as a function of loss, as provided by prior art mode coupling techniques; (b) The dispersion curve at a certain loss based on the prior art for region (1); (c) The dispersion curve at a certain loss based on the prior art for region (2);
FIG. 3 is a schematic diagram of a mode-coupling-based optical frequency comb provided in the prior art based on the dispersion curve of FIG. 2 (b);
FIG. 4 is a schematic structural diagram of a dual micro-ring resonator coupling model according to the present invention;
FIG. 5 is a schematic diagram of the filtering effect of the coupling model of the double micro-ring resonator according to the present invention based on the transmission spectrum, wherein (a) is a schematic diagram of the transmission spectrum of the first micro-ring resonator according to the present invention based on the parameters in Table 1; (b) The invention provides a transmission spectrum schematic diagram of a double micro-ring resonant cavity coupling model based on the parameters of the table 1;
fig. 6 is a schematic diagram of the filtering effect based on the field enhancement factor of the single first micro-ring resonator and the double micro-ring resonator coupling model based on the parameters in table 1 according to the present invention.
FIG. 7 is a dispersion curve at a loss in the region of FIG. 2 (2) for the parameters of Table 2;
FIG. 8 is a diagram of the optical frequency comb effect in a single soliton state based on the filtering effect generated by the dual micro-ring resonator model based on the parameters in Table 1 according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
On the basis of the existing method for promoting generation of the optical frequency comb by introducing mode coupling, the invention provides a method for promoting generation of the optical frequency comb in a single soliton state based on the certainty of the filter effect brought by two micro-ring resonant cavity coupling structures, and the generation of the optical frequency comb in the single soliton state with smoother envelope can be promoted by the filter effect brought by the coupling structures, so that a wider direction is provided for the application of the optical frequency comb and the research of other optical frequency combs.
Specifically, the mode coupling is introduced by adopting a mode of coupling two micro-ring resonant cavities, and a method for promoting optical frequency comb generation based on a filtering effect is provided. The method comprises the steps of firstly coupling another second micro-ring resonant cavity on the basis of a first micro-ring resonant cavity to introduce mode coupling, working the system in a shadow region (1) (namely a coupling region) shown in a figure 2 (a), namely a region where mode coupling causes mode splitting to cause local dispersion change, introducing loss with controllable size through adding electrodes or lighting and the like to the second micro-ring resonant cavity, working the structure in a region (2) (namely a loss region) shown in a figure 2 (a), namely a region where two split modes caused by mode coupling are combined, the local dispersion change is greatly weakened or even disappeared, and the transmittance of the combined coupling mode is increased to a certain extent compared with the transmittance of the original single first micro-ring resonant cavity, equivalently, a certain filtering effect is introduced, and the envelope of the spectral line of the optical-frequency comb generated in the coupling region of fig. 2 (a) is correspondingly distorted due to the change of the local dispersion near the coupling mode caused by the mode coupling, so that the envelope of the optical-frequency comb is not smooth, while when the loss of the second micro-ring resonator is increased to work in the loss region, the change of the local dispersion near the coupling mode is greatly reduced or even disappears, so that the generation of the optical-frequency comb in a smoother single soliton state, in which the distortion of the local spectral line envelope near the coupling mode corresponding to the change of dispersion disappears compared with the optical-frequency comb generated in the coupling region is promoted, except for the loss at the coupling mode caused by the filtering effect.
Compared with the current method for promoting the generation of the optical frequency comb based on the mode coupling, the method for generating the optical frequency comb based on the filter effect is invented, works in the region where the local dispersion caused by the mode coupling is weakened or even disappears, does not generate the unsmooth optical frequency comb with local envelope distortion caused by the change of the local dispersion caused by the mode coupling, promotes the generation of the optical frequency comb in a single soliton state, generates the optical frequency comb with smoother spectral line envelope, and is also very convenient to design. The optical frequency comb generating method can realize the generation of the optical frequency comb in a single soliton state which is deterministic and has smoother envelope by introducing the filtering effect brought by controllable loss to the second micro-ring resonant cavity on the basis of the coupling of the two micro-ring resonant cavities.
To further illustrate the method and apparatus for generating optical frequency comb based on filtering effect according to the embodiments of the present invention, reference is now made to fig. 4, fig. 5, fig. 6, fig. 7 and fig. 8, which are described in detail below with reference to specific examples:
as shown in fig. 4, the optical-frequency comb generating apparatus based on the filtering effect according to the embodiment of the present invention includes: the micro-ring resonator comprises a first micro-ring resonator 1, a straight waveguide 3 and a second micro-ring resonator 2 coupled with the first micro-ring resonator 1; by coupling and arranging the second micro-ring resonator 2 on the first micro-ring resonator 1, the device works in a coupling region shown in fig. 2 (a), namely, a region with mode coupling bringing local dispersion change, and the envelope of the optical frequency comb in the generated single soliton state generates corresponding distortion at the coupling mode due to the change of the local dispersion; and then, the loss with controllable size is introduced into the second micro-ring resonant cavity 2, so that the device works in a loss region, and the local dispersion caused by mode coupling is weakened or even disappears at the moment, thereby promoting the generation of a smoother optical frequency comb in a single soliton state, wherein the optical frequency comb is used for eliminating the local spectral line envelope distortion near the coupling mode corresponding to the change of dispersion except the loss at the coupling mode caused by the introduction of the loss.
As a first embodiment of the present invention, a loss with controllable size is introduced into the second micro-ring resonator by applying an electrode or by illumination, and specifically, the structure shown in fig. 4 is fixed on a three-dimensional displacement platform, a point light source is structurally disposed, the distance between the position of the point light source and the surface of the microcavity structure is adjusted to enable the emergent light spot to fall on the second micro-ring resonator, and at this time, the second micro-ring resonator absorbs photons to generate a free carrier absorption effect, so that the loss is increased, and the amount of absorbed photons can be adjusted by adjusting the intensity of the point light source, so as to achieve the purpose of introducing the loss with controllable size.
Table 1 shows parameters of a first micro-ring resonator 1 and a second micro-ring resonator 2 in an optical-frequency comb generating apparatus based on a filtering effect according to an embodiment of the present invention.
TABLE 1 structural details
In the embodiment of the invention, the effect of generating the smooth optical frequency comb in the single soliton state is obtained by constructing the double micro-ring resonant cavity coupling structure. As shown in fig. 4, the double-ring coupling structure is composed of a first micro-ring resonator 1, a coupling waveguide 3 for transmission, and a second micro-ring resonator 2 for coupling. Specific parameters of the structure are shown in table 1. After pump light is input at the input end of the waveguide, the pump light is transmitted and coupled into the first micro-ring resonant cavity 1 through the waveguide 3, and the central wavelength lambda of the pump light 0 At 1550nm, the ring resonates and forms an equidistant frequency comb in the frequency domain through the action of nonlinearity and dispersion, the distance is determined by the free spectral range FSR of the ring and is related to the perimeter of the micro-ring resonator, and at this time, the second micro-ring resonator 2 is coupled, and light is partially coupled into the second micro-ring resonator through the first micro-ring resonator, and also forms an equidistant frequency comb in the frequency domain, and since the first micro-ring resonator and the second micro-ring resonator have the same resonant frequency at the 5 th mode from the pump long wavelength, that is, at approximately 1559.117nm, the resonant modes of the two micro-ring resonators at this frequency generate mode coupling, and at this time, the structure operates in the shaded coupling region as shown in fig. 2 (a), that is, the mode coupling causes mode splitting, and the local dispersion changes.
The expression for angular frequency is:
and the resulting modal frequency dependent dispersion curve equation ω μ -ω 0 -D 1 μ, wherein D 1 ＝FSR，/>
First and second order dispersion coefficients, respectively, FSR = c/nL, and μ represents the mode from the μ -th center frequency. In this case, the dispersion curve of the structure operating in the coupling region is similar to the dispersion curve shown in fig. 2 (b) based on the prior art, and although the generation of the optical-frequency comb can be promoted due to the effect of the mode coupling effect in this region, the envelope of the generated optical-frequency comb is distorted and not smooth due to the change of the dispersion in the mode-coupled region as in fig. 3. Therefore, the invention can increase the loss in the second micro-ring resonant cavity by using the point light source to irradiate the second micro-ring resonant cavity and utilizing the carrier absorption effect, so that the loss alpha of the second micro-ring resonant cavity is reduced 2 L 2 Enlarged to 9.4X 10 -3 In the case where the structure is operated in the loss region shown in fig. 2 (a), and the resulting dispersion curve is shown in fig. 7, it can be seen that the local dispersion change near the 5 th mode from the pump long wavelength due to the mode coupling effect disappears and the dispersion curve becomes smooth, as compared with the case where the mode coupling causes the local dispersion change as in the dispersion curve graph 2 (b) operated in the coupling region shown in fig. 2 (a). The invention can obtain the transmissivity of a single first micro-ring resonant cavity near 1559.117nm in a coupling mode when the second micro-ring resonant cavity is not coupled, as shown in figure 5 (a), and the transmissivity of a single first micro-ring resonant cavity near 1559.117nm after two micro-ring resonant cavities are coupled and loss is added to the second micro-ring resonant cavity 2, as shown in figure 5 (b). At the same time, the effect graphs of the field enhancement factors around 1559.117nm of the coupled mode in the above two cases can be obtained, as shown in fig. 6. At this time, it can be seen that after the structure works in the non-shadow loss region shown in fig. 2 (a) by introducing the coupling of the double micro-ring resonators and adding a certain amount of loss to the second micro-ring resonator, the transmittance at the coupling mode is increased, the field enhancement factor is reduced to below 0dB, which is equivalent to that a certain loss, that is, a filtering effect is generated at the frequency of the coupling mode in the micro-ring resonator. Unlike the prior art which uses the mode coupling effect to facilitate the generation of optical frequency combs, the present invention utilizes such a filtering effectTo facilitate the generation of the optical-frequency comb in the single-soliton state, the generated optical-frequency comb has a smoother spectral envelope (as shown by the dashed line in fig. 8) than the optical-frequency comb in the single-soliton state generated by the mode coupling effect in fig. 3.
Therefore, the optical frequency comb generation method can promote the generation of the optical frequency comb in the single soliton state through the filtering effect brought by the structure of coupling the two micro-ring resonant cavities, and the generated optical frequency comb envelope is smoother.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for generating an optical frequency comb based on a filtering effect, comprising:
the mode coupling effect is introduced by coupling the first micro-ring resonant cavity with the straight waveguide and introducing a second micro-ring resonant cavity to be coupled with the first micro-ring resonant cavity;
the loss is introduced into the second micro-ring resonant cavity, so that the local dispersion introduced by the mode coupling effect is weakened or even eliminated, the transmissivity at the coupling mode frequency is increased to a certain extent compared with that of a single first micro-ring resonant cavity at the frequency, and the optical filtering effect is equivalently introduced into the optical field in the first micro-ring resonant cavity, so that the generation of a single soliton state of the optical frequency comb of the first micro-ring resonant cavity is promoted, and the optical frequency comb with smoother envelope is generated;
wherein the perimeter of the second micro-ring resonator is smaller or much smaller than the perimeter of the first micro-ring resonator.
2. The optical-frequency comb generation method of claim 1, wherein a loss of controllable magnitude is introduced to the second micro-ring resonator by means of an applied electrode or illumination.
3. The optical frequency comb generation method of claim 1, wherein when a point light source is used to introduce a loss with controllable magnitude into the second micro-ring resonator, the magnitude of the introduced loss is adjusted by adjusting the intensity of the point light source to adjust the number of absorbed photons.
4. The method as claimed in claim 1, wherein when the pump light is inputted at the input end of the straight waveguide, the pump light is transmitted and coupled into the first micro-ring resonator through the straight waveguide, and resonates in the first micro-ring resonator and forms equally spaced frequency sparse teeth under the nonlinear effect, and the size of the spacing is determined by the free spectral range of the first micro-ring resonator.
5. An optical frequency comb generating apparatus based on a filtering effect, comprising: the micro-ring resonator comprises a first micro-ring resonator (1), a straight waveguide (3) and a second micro-ring resonator (2) which is coupled with the first micro-ring resonator (1);
the loss is introduced into the second micro-ring resonant cavity (2), so that the local dispersion introduced by the mode coupling effect is weakened or even disappears, the transmissivity at the coupling mode frequency is increased to a certain extent, and the optical filtering effect is equivalently introduced into the optical field in the first micro-ring resonant cavity, so that the generation of a single soliton state of the microcavity optical frequency comb is promoted, and the optical frequency comb with smoother envelope is generated.
6. The optical-frequency comb generating apparatus as claimed in claim 5, wherein in operation, a pump light is input at an input end of the straight waveguide, the pump light is transmitted and coupled to the first micro-ring resonator via the straight waveguide, and the first micro-ring resonator resonates to form frequency comb teeth with equal spacing and smoother envelope under nonlinear and dispersive effects.
7. The optical-frequency comb generating apparatus as claimed in claim 5, further comprising: and the loss introducing unit is used for introducing loss to the second micro-ring resonant cavity (2) so that local dispersion introduced by mode coupling effect is weakened or even disappears.
8. The optical-frequency comb generating apparatus as claimed in claim 7, wherein the loss introducing unit includes: the two electrodes are respectively arranged in a p area and an n area of a second micro-ring resonant cavity manufactured on the basis of the p-i-n structure waveguide, forward bias voltage is applied to the p-i-n structure waveguide, carriers are injected into the second micro-ring resonant cavity, absorption loss of near infrared light is increased by utilizing a carrier absorption effect, so that loss of the second micro-ring resonant cavity is increased, and the loss of the second micro-ring resonant cavity is controlled by adjusting the magnitude of the applied forward bias voltage.
9. The optical-frequency comb generating apparatus as claimed in claim 7, wherein the loss introducing unit includes: the point light source is arranged above the second micro-ring resonant cavity, emergent light spots of the point light source all fall on the second micro-ring resonant cavity, carriers are generated due to absorption of visible light, absorption loss of near infrared light is increased by utilizing the carrier absorption effect, so that loss of the second micro-ring resonant cavity is increased, and the quantity of absorbed photons is adjusted by adjusting the intensity of the point light source, so that the loss of the second micro-ring resonant cavity is adjusted.
10. The optical-frequency comb generating apparatus as claimed in claim 7, wherein the loss introducing unit comprises: the novel waveguide is coupled with the second micro-ring resonant cavity, the electrode is arranged in a coupling area of the second micro-ring resonant cavity and the novel waveguide, the refractive index of the coupling area is changed by heating the electrode through a thermo-optical effect, and therefore the coupling coefficient of the novel waveguide and the second micro-ring resonant cavity is changed, and therefore the loss of the second micro-ring resonant cavity is adjusted.
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