CN115268161A - System and method for realizing phase regeneration with low power consumption - Google Patents
System and method for realizing phase regeneration with low power consumption Download PDFInfo
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- CN115268161A CN115268161A CN202110484557.7A CN202110484557A CN115268161A CN 115268161 A CN115268161 A CN 115268161A CN 202110484557 A CN202110484557 A CN 202110484557A CN 115268161 A CN115268161 A CN 115268161A
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- 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
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- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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- G02F1/3538—Four-wave interaction for optical phase conjugation
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- 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
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Abstract
The invention provides a system and a method for realizing phase regeneration with low power consumption, belonging to the field of phase regeneration, wherein the system comprises; the micro-ring resonator comprises a first micro-ring resonator, a second micro-ring resonator, a first waveguide and a second waveguide; the first micro-ring resonant cavity and the first waveguide are in a critical coupling state; the radius of the first micro-ring resonant cavity is integral multiple of the radius of the second micro-ring resonant cavity; the first micro-ring resonant cavity is used for resonating the pump light and the signal light, and generating idler frequency light at the signal light wavelength under the action of four-wave mixing; the idler frequency light and the signal light generate coherent interference, and the wavelength of the phase regeneration pump light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity and is not the wavelength corresponding to the resonance peak of the second micro-ring resonant cavity; the wavelength of the signal light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity coupled with the second micro-ring resonant cavity. The invention ensures the modulation rate of the signal light and the conversion efficiency of the idle frequency light, realizes the phase regeneration function and obviously reduces the power consumption.
Description
Technical Field
The invention belongs to the field of phase regeneration, and particularly relates to a system and a method for realizing phase regeneration with low power consumption.
Background
With the development of communication systems, the requirement for data capacity is increasing, and more researchers turn their eyes to phase modulation, so that data can carry amplitude information and phase information simultaneously when being transmitted. However, a technical limitation is that nonlinear noise generated during transmission may limit communication quality. Nonlinear noise in the phase modulation process can be well eliminated by utilizing a phase regeneration technology, and amplitude information and phase information can be simultaneously regenerated through a phase sensitive amplifier. The existing phase regeneration technology mostly utilizes four-wave mixing to generate harmonic waves, and then the harmonic waves and signal light are subjected to coherent superposition to realize regeneration, which requires that the amplitudes of the harmonic waves and the signal light are relatively close to each other, so that a good phase regeneration effect can be realized.
The phase regeneration is realized through the four-wave mixing effect of the high nonlinear optical fiber, and a great step is further developed for the practicability of phase sensitive amplification. Two beams of pump light and signal light with locked phases are injected into the high nonlinear optical fiber, and four-wave mixing effect can occur in the optical fiber to generate idler frequency light related to the phases of the pump light and the signal light. The idler frequency light and the signal light are coherently superposed to realize the phase-sensitive amplification effect, and the principle is shown in fig. 1. However, this method requires high power and requires a long optical fiber, which is not suitable for integration.
Phase regeneration is realized by adopting a photonic crystal waveguide, miniaturization is realized on the device, and the principle is that a four-wave mixing technology of pumping degeneracy is utilized, as shown in figure 2. However, this structure has two-photon absorption and free carrier absorption, and can achieve a good extinction ratio, but the peak gain of the regenerated signal is small.
The reverse bias p-i-n junction is used on the silicon waveguide, so that the free carrier absorption of the silicon waveguide can be effectively reduced, and the four-wave mixing efficiency is improved. However, the waveguide structure is complicated, and an additional electrical bias is required, which results in high power consumption.
Phase regeneration can also be achieved by using SiGe waveguides and four-wave mixing with two beams of pump light of different polarizations, the principle is shown in fig. 3. However, this scheme requires strict control of the polarization state of incident light, and is relatively complex to implement and not highly practical.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a system and a method for realizing phase regeneration with low power consumption, and aims to solve the problem of high power consumption of the conventional phase regeneration realizing method.
To achieve the above object, the present invention provides a system for realizing phase regeneration with low power consumption, comprising: the first micro-ring resonant cavity, the second micro-ring resonant cavity, the first waveguide and the second waveguide;
the first micro-ring resonant cavity and the first waveguide are in a critical coupling state, and the coupling coefficient is a first coupling coefficient; the first micro-ring resonant cavity is coupled with the second micro-ring resonant cavity, the coupling coefficient is a second coupling coefficient, and the mode part corresponding to the resonance peak at the coupling wavelength is split; the second micro-ring resonant cavity is coupled with the second waveguide, the coupling coefficient is a third coupling coefficient, and the output bandwidth obtained by coupling is larger than the bandwidth of the transmission signal; the third coupling coefficient is slightly larger than the second coupling coefficient; the radius of the first micro-ring resonant cavity is integral multiple of the radius of the second micro-ring resonant cavity;
the first waveguide is used for inputting two beams of pump light; the second waveguide is used for inputting signal light and adjusting the magnitude of the third coupling coefficient; the first micro-ring resonant cavity is used for resonating the pump light and the signal light, and generating idler frequency light at the signal light wavelength under the action of four-wave mixing; the idle frequency light and the signal light generate coherent interference to realize phase regeneration; the second micro-ring resonant cavity is used for resonating signal light;
the wavelengths of the two pumping lights are symmetrical with the wavelength of the signal light; the wavelength of the pump light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity and is not the wavelength corresponding to the resonance peak of the second micro-ring resonant cavity; the wavelength of the signal light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity coupled with the second micro-ring resonant cavity.
Preferably, the material of the first micro-ring resonant cavity and the second micro-ring resonant cavity is a third-order nonlinear material.
Preferably, the condition that the coupling strength value between the first micro-ring resonant cavity and the second micro-ring resonant cavity is greater than one quarter of the difference value between the first loss and the second loss is the condition for realizing mode splitting of the resonant peak at the coupling wavelength of the first micro-ring resonant cavity and the second micro-ring resonant cavity;
the first loss is the total loss of the intrinsic loss of the second micro-ring resonant cavity and the coupling loss introduced by the second waveguide;
the second loss is the total loss of the first micro-ring resonator intrinsic loss and the coupling loss introduced by the first waveguide.
Preferably, the method for obtaining that the first micro-ring resonant cavity and the first waveguide are in the critical coupling state comprises the following steps:
and adjusting the first coupling coefficient by adjusting the distance between the first waveguide and the first micro-ring resonant cavity, so that the coupling loss introduced by the first waveguide is equal to other residual losses.
On the other hand, the invention provides a corresponding phase regeneration method based on the system for realizing phase regeneration with low power consumption, which comprises the following steps:
inputting pump light into the first micro-ring resonant cavity for resonance enhancement, and improving the power in the first micro-ring resonant cavity;
inputting signal light at the second waveguide end, wherein the signal light oscillates in the first micro-ring resonant cavity and the second micro-ring resonant cavity;
based on the phase matching condition of four-wave mixing, the pump light and the signal light generate nonlinear action in the first micro-ring resonant cavity, and idle frequency light is generated at the signal light wavelength;
the idle frequency light and the signal light are subjected to coherent superposition, when the idle frequency light and the signal light are subjected to interference constructive, the signal light is amplified, and when the idle frequency light and the signal light are subjected to interference destructive, the signal light is weakened, so that phase regeneration is realized;
the first micro-ring resonant cavity and the first waveguide are in a critical coupling state, and the mode part corresponding to a resonance peak at the coupling wavelength of the first micro-ring resonant cavity and the second micro-ring resonant cavity is split; the third coupling coefficient is slightly larger than the second coupling coefficient; the radius of the first micro-ring resonant cavity is integral multiple of the radius of the second micro-ring resonant cavity;
the wavelengths of the two pumping lights are symmetrical with respect to the wavelength of the signal light; the wavelength of the pump light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity and is not the wavelength corresponding to the resonance peak of the second micro-ring resonant cavity; the wavelength of the signal light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity coupled with the second micro-ring resonant cavity.
Preferably, the method for generating mode splitting by the resonance peak at the coupling wavelength of the first micro-ring resonator and the second micro-ring resonator comprises the following steps: the coupling strength value between the first micro-ring resonant cavity and the second micro-ring resonant cavity is larger than one fourth of the difference value between the first loss and the second loss;
the first loss is the total loss of the intrinsic loss of the second micro-ring resonant cavity and the coupling loss introduced by the second waveguide;
the second loss is the total loss of the intrinsic loss of the first micro-ring resonator and the coupling loss introduced by the first waveguide.
Preferably, the method for obtaining that the first micro-ring resonator and the first waveguide are in the critical coupling state comprises the following steps:
and adjusting a first coupling coefficient by adjusting the distance between the first waveguide and the first micro-ring resonant cavity, so that the coupling loss introduced by the first waveguide is equal to other residual losses.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
the input pump light wavelength provided by the invention can generate resonance in the first micro-ring resonant cavity but can not generate resonance in the second resonant cavity; the input signal light wavelength can resonate in the first resonant cavity and the second resonant cavity. At this time, because the coupling coefficients of the waveguides coupled with the two micro-rings are different, and the pump light and the signal light are respectively input from the two waveguides, the pump light and the signal light can be separated, so that a strong enhancement effect is ensured for the pump light, and a large bandwidth and a strongest enhancement effect under the bandwidth are ensured for the signal light energy. Therefore, the modulation rate of the signal light and the conversion efficiency of the idle frequency light can be ensured, the phase regeneration function is realized, and the power consumption is obviously reduced.
The invention is based on the coupling structure of two micro-ring resonant cavities, the micro-ring resonant cavity has a smaller structure (generally the radius is within 200 um), and compared with a high nonlinear optical fiber structure (generally the length is more than one hundred meters), the micro-ring resonant cavity can be integrated on a chip better.
The first micro-ring resonant cavity and the second micro-ring resonant cavity provided by the invention are three-order nonlinear materials, and the material loss is relatively low, so that the power consumption can be reduced.
The method for generating mode splitting of the resonance peak at the coupling wavelength of the first micro-ring resonant cavity and the second micro-ring resonant cavity provided by the invention comprises the following steps: enabling the coupling strength value between the first micro-ring resonant cavity and the second micro-ring resonant cavity to be larger than one fourth of the difference value between the first loss and the second loss; the coupling strength value is set to the position where the resonance peak just starts to be split, but the resonance peak is not in a completely split state; the phase regeneration function can be better realized and used for actual signal transmission when the two resonance peaks are in the above state.
Drawings
FIG. 1 is a schematic diagram of phase regeneration achieved by a highly nonlinear optical fiber provided in the prior art;
FIG. 2 is a schematic diagram of phase regeneration achieved by degenerate four-wave mixing using photonic crystal waveguides as provided in the prior art;
FIG. 3 is a schematic diagram of phase regeneration using pumps with different polarization directions provided by the prior art;
FIG. 4 is a schematic structural diagram of two waveguide couplings of two micro-ring resonators according to an embodiment of the present invention;
fig. 5 is an energy resonance enhancement spectrum for pump light and signal light in the first micro-ring resonant cavity provided in the embodiment of the present invention;
fig. 6 shows the phase regeneration effect of the phase structure of two micro-ring resonators and two waveguide coupling structures according to the embodiment of 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.
The invention adopts two different micro-ring resonant cavities to be mutually coupled, and then adopts two waveguides to respectively couple the two resonant cavities; by utilizing the effect brought by the mutual coupling of the micro-ring resonant cavities and the coupling of different waveguides to each micro-ring resonant cavity, the system can improve the conversion efficiency of the idler frequency light under lower power consumption, and obtain better phase regeneration effect. The problems that the existing phase regeneration method is difficult to integrate and has larger power consumption can be solved, low power consumption and large broadband can be considered, and the method is more suitable for actual communication scenes, so that the whole system has higher cost performance, smaller size and wider application range.
The system for realizing phase regeneration with low power consumption provided by the invention has the following characteristics: (1) The first micro-ring resonant cavity and the second micro-ring resonant cavity are different in size, and the circumference of the first micro-ring resonant cavity can be set to be integral multiple of the circumference of the second micro-ring resonant cavity; meanwhile, the lower the loss of the two micro-ring resonant cavities is, the better the loss is; (2) When the second waveguide is coupled with the second micro-ring resonant cavity, the final output bandwidth is ensured to be wider than the expected input signal bandwidth (the input signal is signal light, and the output signal is light obtained by interference superposition of the signal light and idler frequency light) so as to ensure that the input signal can pass through smoothly; (3) The coupling between the first micro-ring resonant cavity and the second micro-ring resonant cavity ensures that a resonant peak at the coupling position of the two rings generates slight mode splitting; in order to achieve the effect, the coupling strength value between the first micro-ring resonant cavity and the second micro-ring resonant cavity needs to be slightly larger than one fourth of the sum of the intrinsic loss of the second micro-ring resonant cavity, the coupling loss caused by the second waveguide, the intrinsic loss of the first micro-ring resonant cavity and the coupling loss caused by the first waveguide; for example, the coupling strength value between the first micro-ring resonator and the second micro-ring resonator may be taken to be 1.1 times one fourth of the difference between the first loss and the second loss; the first loss is the total loss of the intrinsic loss of the second micro-ring resonant cavity and the coupling loss introduced by the second waveguide; the second loss is the total loss of the intrinsic loss of the first micro-ring resonator and the coupling loss introduced by the first waveguide. (4) The first waveguide is coupled with the first resonant cavity to ensure that critical coupling is achieved; by regulating and controlling the coupling strength of the first waveguide and the first resonant cavity, the coupling loss brought by the first waveguide is approximately equal to other overall losses of the system, and at the moment, critical coupling can be achieved, so that input light in the first waveguide is basically extinguished at an output port of the first waveguide.
As an embodiment of the present invention, the first coupling coefficient is much smaller than the second coupling coefficient and the third coupling coefficient, and the third coupling coefficient is larger than the second coupling coefficient; the first coupling coefficient refers to a coupling coefficient between the first waveguide and the first micro-ring resonant cavity, the second coupling coefficient refers to a coupling coefficient between the first micro-ring resonant cavity and the second micro-ring resonant cavity, and the third coupling coefficient refers to a coupling coefficient between the second waveguide and the second micro-ring resonant cavity.
The phase regeneration system with low power consumption provided by the invention can be prepared according to the following method:
(1) Determining the bandwidth of the converted signal light, for example, the bandwidth may be set to 12GHz;
(2) Determining the coupling coefficient, for example, the coupling coefficient may be set as: the first coupling coefficient is 0.1341, the second coupling coefficient is 0.27, and the third coupling coefficient is 0.58;
(3) And respectively coupling the first micro-ring resonant cavity and the second micro-ring resonant cavity with different sizes with the first waveguide and the second waveguide to form a double-resonant-cavity and double-waveguide structure.
According to the low-power-consumption phase regeneration system provided by the method, two beams of pump light capable of resonating in a first resonant cavity are input from one side of a first waveguide coupled with the first micro-ring resonant cavity, the wavelength of the pump light is the wavelength corresponding to the resonant peak of the first micro-ring resonant cavity which is not coupled with a second micro-ring resonant cavity, and the wavelength of the pump light is symmetrical with the wavelength of signal light; the wavelength of the signal light is the coupling wavelength of the first micro-ring resonant cavity and the second micro-ring resonant cavity; because the sizes of the two micro-ring resonant cavities are different, the pump light can only resonate in the first micro-ring resonant cavity, and because the critical coupling is achieved between the first waveguide and the first micro-ring resonant cavity, the pump light is completely coupled into the first micro-ring resonant cavity, the resonance in the first resonant cavity is greatly enhanced, the power level in the first micro-ring resonant cavity is high, and the four-wave mixing efficiency is high;
meanwhile, signal light which can resonate in the first micro-ring resonant cavity and the second micro-ring resonant cavity simultaneously is input at the same side of a second waveguide coupled with the second micro-ring resonant cavity; due to the coupling of the first micro-ring resonant cavity and the second micro-ring resonant cavity, a mutually coupled resonance peak exists between the first micro-ring resonant cavity and the second micro-ring resonant cavity, and the wavelength corresponding to the coupling resonance peak between the two beams of pump light is selected as the wavelength of the signal light, so that the signal light can resonate in the two resonance cavities. Due to the fact that the third coupling coefficient is large, the resonance peak where the signal light is located can have a bandwidth far larger than that of the resonance peak where the pump light is located. Furthermore, because the signal light can resonate in the first micro-ring resonant cavity, the pump light and the signal light exist in the first micro-ring resonant cavity at the same time, and due to the high power level of the large resonance, the four-wave mixing efficiency is high, and the idler frequency light power generated by the four-wave mixing efficiency is high.
According to the phase matching condition of four-wave mixing, in the setting mode of the pump light and the signal light, the idler frequency light is generated at the signal light wavelength, carries the phase information related to the signal light and the pump light, and is coherently superposed with the signal light. When the idler frequency light and the signal light meet the interference phase condition, the signal light is amplified; when the idler frequency light and the signal light satisfy the interference cancellation condition, the signal light is weakened. Therefore, the low-power-consumption phase regeneration system has the phase sensitive amplification characteristic and can realize the phase regeneration function. Meanwhile, due to the improvement of the conversion efficiency of the idler frequency light, the idler frequency light equivalent to the amplitude of the signal light can be obtained under the condition of lower power consumption, so that the contrast of light interference is better, and the better phase gain extinction ratio is achieved.
The phase regeneration system with low power consumption can realize better phase regeneration effect and is very convenient to design.
To further illustrate the advantages of the low power consumption phase regeneration system provided by the present invention, it is now compared with the prior art to analyze:
(1) Compared with a high nonlinear optical fiber system, the low-power-consumption phase regeneration system comprises a double-resonant-cavity double-waveguide structure, the resonance enhancement effect of the micro-ring resonant cavity is many times larger than that of high nonlinear, the length of the required material is greatly reduced, and the structure is more suitable for integration and miniaturization.
(2) Compared with a waveguide structure, the low-power-consumption phase regeneration system provided by the invention utilizes the resonance enhancement effect of the micro-ring resonant cavity, can obviously reduce power consumption, increase peak gain and improve the extinction ratio of the phase gain.
(3) The invention can solve the contradiction between gain and bandwidth, can obtain high gain of pump light and large bandwidth of signal light at the same time, and is more suitable for practical communication scenes.
As shown in fig. 5, two micro-ring resonators with very low loss coefficients and different radii are used for coupling. According to the micro-ring resonance condition, when the wavelength of the incident light satisfies
At this time, the input light resonates within the microring resonator. Wherein m is the resonance order; n iseffIs the effective refractive index of the material; l is the length of the micro-ring resonant cavity; in FIG. 4, the circumferences of the two micro-ring resonators are L1，L2(ii) a By selecting materials and the radius of the micro-ring, an aligned resonance peak is formed between the two micro-ring resonant cavities, so that the perimeter of the first micro-ring resonant cavity is required to be integral multiple of that of the second micro-ring resonant cavity, and the wavelength corresponding to the aligned resonance peak can reach a resonance state in a double ring at the same time.
Two micro-ring resonators of the same material and different radii can be selected. E.g. using neffMaterial L of =1.91＝1600um，L2And the resonance wavelength of the two micro-ring resonant cavities is 1550.8nm in the position of two rings of =800 um. Due to the different radii of the two micro-ring resonators, there are some misaligned peaks in the Free Spectral Range (FSR) at which the two micro-ring resonators are not coupled and have minimal mutual effect, as shown by the two peaks on the left and right of fig. 5. Meanwhile, because the circumferences of the two rings have a multiple relation, the resonance peaks of the two rings are overlapped at regular intervals, at the moment, the two micro-ring resonant cavities are in a coupling state, and the resonance peak at the alignment position has a large bandwidth due to the coupling effect, such as the resonance peak in the middle of fig. 5As shown.
The phase regeneration function is realized by using a double-resonant-cavity double-waveguide structure, and the principle is shown in figure 1. Using degenerate four-wave mixing (FWM) with two beams at omega frequencyp1And ωp2The strong pump light transmits energy to the frequency omegasThe frequency of the signal light is located between the frequencies of the two pump lights. The frequency of the three beams of light satisfies 2 omegas＝ωp1+ωp2In phases of respectively
When three beams of light exist in the waveguide at the same time, idler frequency light can be generated at the frequency of the signal light due to the energy conservation effect and the momentum conservation effect, and the phase is satisfied
The idler light and the signal light will add coherently. When the phase difference of the signal light and the idler frequency light meets the interference phase condition, the signal light is amplified; when the phase difference satisfies the interference cancellation condition, the signal light is attenuated; the above process is a phase sensitive parametric amplification process, based on which a phase regeneration function is realized.
In the invention, the waveguide and the micro-ring resonant cavity are coupled laterally, specifically as follows: the first waveguide coupled with the first micro-ring resonant cavity inputs two beams of pump light, the wavelength of the pump light corresponds to the resonance peaks at the left side and the right side in the figure 5, the two micro-ring resonant cavities are not coupled at the wavelength, the coupling of the first waveguide and the first micro-ring resonant cavity is adjusted to be in a critical coupling state, and the pump light is greatly enhanced in resonance in the first micro-ring resonant cavity; meanwhile, signal light is input at the same side of the second waveguide, the wavelength of the signal light corresponds to the middle resonance peak in fig. 5, and resonance occurs in the two micro-ring resonance cavities. It should be noted here that the FSRs of the plurality of first micro-ring resonators may be spaced as long as it is satisfied that the signal light wavelength corresponds to the coupled resonance peak wavelength, the pump light wavelength is symmetric with respect to the signal light wavelength and corresponds to the uncoupled resonance peak wavelength.
The coupling coefficient of the first waveguide and the first micro-ring resonant cavity is k1Transmission coefficient of r1The coupling coefficient between the first micro-ring resonator and the second micro-ring resonator is k2Transmission coefficient of r2The coupling coefficient between the second micro-ring resonant cavity and the second waveguide is k3Transmission coefficient of r3. The loop pass transmission coefficient of the first micro-ring resonant cavity is a1The second resonant cavity has a loop transmission coefficient of a2The loop path transmission coefficient of the micro-ring resonator determines the self loss a = exp (-beta L/2), wherein beta is the optical field transmission loss coefficient in the micro-ring resonator, and includes bending loss, scattering loss and the like. The loop path transmission coefficient a of the micro-ring resonant cavity is related to the cavity length of the micro-ring resonant cavity and the optical field transmission loss coefficient beta.
In the phase regeneration process, the closer the amplitudes of the idler frequency light and the signal light generated by four-wave mixing are, the better the extinction ratio is, the larger the difference between the maximum gain and the minimum gain of the signal light is, the better the phase regeneration effect is. To achieve this effect, it is generally necessary to increase the conversion efficiency by increasing the pump power. The wavelength conversion efficiency of the micro-ring system is
Wherein, P is the power of the pump light; gamma is a material nonlinear coefficient; l is a radical of an alcoholeffIs the effective length of the micro-ring; fp、Fs、FiThe intensity gain factors of the system for pump light, signal light and idler light are respectively.
For a single micro-ring system, there are
The system has consistent and limited gain for pump, signal and idler.
For a double micro-ring system, there are
By adjusting parameters, can make
At the time of the pump light is atThe critical coupling state has high gain, and can improve the four-wave mixing efficiency, thereby improving the conversion efficiency and reducing the power consumption; meanwhile, signal light is input from another waveguide, and due to the coupling effect of the two micro-ring resonant cavities, a large bandwidth can be obtained, and the practicability of a communication system is ensured. The above set of specific parameter values is given in table 1 below;
TABLE 1
In the embodiment of the invention, by constructing the double-resonant-cavity double-waveguide coupling structure, the phase regeneration function is realized by using the micro-ring resonant cavity, and the better extinction ratio can be achieved while the power consumption is reduced, so that the phase regeneration effect is better.
FIG. 6 shows the phase extinction ratio of the dual-cavity and dual-waveguide coupling structure provided by the present invention under a set of parameters.
The wavelength of input pump light can generate resonance in the first micro-ring resonant cavity but can not generate resonance in the second micro-ring resonant cavity; the input signal light wavelength can resonate in the first micro-ring resonant cavity and the second micro-ring resonant cavity. At this time, the two waveguides and the two micro-ring resonators have different coupling coefficients, and the pump light and the signal light are respectively input from the two waveguides. Thus, the pump light and the signal light are separated, the strong enhancement effect is ensured on the pump light, and the large bandwidth and the strongest enhancement effect under the bandwidth are ensured on the signal light energy. Therefore, the modulation rate of the signal light and the conversion efficiency of the idler frequency light can be simultaneously ensured, the phase regeneration function is realized, and the power consumption is obviously reduced.
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 (7)
1. A low power consumption phase regeneration enabled system, comprising: the first micro-ring resonant cavity, the second micro-ring resonant cavity, the first waveguide and the second waveguide;
the first micro-ring resonant cavity and the first waveguide are in a critical coupling state, and the coupling coefficient is a first coupling coefficient; the first micro-ring resonant cavity is coupled with the second micro-ring resonant cavity, the coupling coefficient is a second coupling coefficient, and the mode part corresponding to the resonance peak at the coupling wavelength is split; the second micro-ring resonant cavity is coupled with the second waveguide, the coupling coefficient is a third coupling coefficient, and the output bandwidth obtained by coupling is larger than the bandwidth of the transmission signal; the third coupling coefficient is greater than the second coupling coefficient; the radius of the first micro-ring resonant cavity is integral multiple of the radius of the second micro-ring resonant cavity;
the first waveguide is used for inputting two beams of pump light; the second waveguide is used for inputting signal light and adjusting the magnitude of a third coupling coefficient; the first micro-ring resonant cavity is used for resonating the pump light and the signal light, and generating idler frequency light at the signal light wavelength under the action of four-wave mixing; the idle frequency light and the signal generate coherent interference to realize phase regeneration; the second micro-ring resonant cavity is used for resonating signal light;
the wavelengths of the two beams of pump light are symmetrical with respect to the wavelength of the signal light; the wavelength of the pump light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity and is not the wavelength corresponding to the resonance peak of the second micro-ring resonant cavity; the wavelength of the signal light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity coupled with the second micro-ring resonant cavity.
2. The system for realizing phase regeneration with low power consumption of claim 1, wherein the materials of the first micro-ring resonator and the second micro-ring resonator are third-order nonlinear materials.
3. The system for realizing phase regeneration with low power consumption according to claim 1 or 2, wherein the mode splitting is generated by a resonance peak at the wavelength of the coupling wavelength of the first micro-ring resonator and the second micro-ring resonator by: enabling the coupling strength value between the first micro-ring resonant cavity and the second micro-ring resonant cavity to be larger than one fourth of the difference value between the first loss and the second loss;
wherein the first loss is the total loss of the intrinsic loss of the second micro-ring resonator and the coupling loss introduced by the second waveguide;
and the second loss is the total loss of the intrinsic loss of the first micro-ring resonant cavity and the coupling loss introduced by the first waveguide.
4. The system for realizing phase regeneration with low power consumption of claim 1, wherein the critical coupling state of the first micro-ring resonator and the first waveguide is obtained by:
and adjusting a first coupling coefficient by adjusting the distance between the first waveguide and the first micro-ring resonant cavity, so that the coupling loss introduced by the first waveguide is equal to other residual losses.
5. A phase regeneration method for implementing a phase regeneration system with low power consumption according to claim 1, comprising the steps of:
pumping light is input into the first micro-ring resonant cavity for resonance enhancement, and the power in the first micro-ring resonant cavity is improved;
inputting signal light at the second waveguide end, wherein the signal light oscillates in the first micro-ring resonant cavity and the second micro-ring resonant cavity;
based on the phase matching condition of four-wave mixing, the pump light and the signal light generate nonlinear action in the first micro-ring resonant cavity, and idle frequency light is generated at the signal light wavelength;
the idle frequency light and the signal light are subjected to coherent superposition, when the idle frequency light and the signal light are subjected to interference constructive, the signal light is amplified, and when the idle frequency light and the signal light are subjected to interference destructive, the signal light is weakened, so that phase regeneration is realized;
the first micro-ring resonant cavity and the first waveguide are in a critical coupling state, and mode parts corresponding to resonance peaks at coupling wavelengths of the first micro-ring resonant cavity and the second micro-ring resonant cavity are split; the third coupling coefficient is greater than the second coupling coefficient; the radius of the first micro-ring resonant cavity is integral multiple of the radius of the second micro-ring resonant cavity;
the wavelengths of the two pumping lights are symmetrical with respect to the wavelength of the signal light; the wavelength of the pump light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity, and is not the wavelength corresponding to the resonance peak of the second micro-ring resonant cavity; the wavelength of the signal light is the wavelength corresponding to the resonance peak of the first micro-ring resonant cavity coupled with the second micro-ring resonant cavity.
6. The phase regeneration method of claim 5, wherein the mode splitting is generated by a resonance peak at the wavelength of the coupling wavelength of the first micro-ring resonator and the second micro-ring resonator by: enabling the coupling strength value between the first micro-ring resonant cavity and the second micro-ring resonant cavity to be larger than one fourth of the difference value between the first loss and the second loss;
wherein the first loss is the total loss of the intrinsic loss of the second micro-ring resonator and the coupling loss introduced by the second waveguide;
and the second loss is the total loss of the intrinsic loss of the first micro-ring resonant cavity and the coupling loss introduced by the first waveguide.
7. The phase regeneration method of claim 5, wherein the critical coupling state of the first micro-ring resonator and the first waveguide is obtained by:
and adjusting a first coupling coefficient by adjusting the distance between the first waveguide and the first micro-ring resonant cavity, so that the coupling loss introduced by the first waveguide is equal to other residual losses.
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