Response waveform modulation method for optical system, device, system, and readable medium

Abstract

The present application discloses a response waveform modulation method for an optical system, a device, a system, and a readable medium. The optical system comprises a plurality of cascaded optical elements having periodic responses and a plurality of phase modulators respectively arranged on each of the optical elements. The method comprises: acquiring an optical system response waveform target translation amount and free spectral range (FSR) lengths of respective response waveforms of the plurality of optical elements; on the basis of the optical system response waveform target translation amount, each FSR length, and a preset translation algorithm, determining respective phase modulation amounts of the plurality of optical elements; and respectively outputting the determined plurality of phase modulation amounts to the corresponding phase modulators, so that the response waveforms of the optical elements are respectively modulated by means of the plurality of phase modulators according to the plurality of phase modulation amounts, thus enabling response waveforms of the optical system to be significantly linearly translated within an extremely large range, that is, within a total FSR.

Description

Optical system response waveform modulation methods, devices, systems, and readable media Technical Field

[0001] This application relates to the field of optical technology, and more specifically, to a method, apparatus, system, and readable medium for modulating the response waveform of an optical system. Background Technology

[0002] Transmission response is a fundamental indicator describing the ability of an optical system to transmit optical signals, revealing the influence of the optical system on different frequency components of the optical signal. Therefore, in the entire field of optical engineering (including integrated optics, fiber optics, or free-space optics, etc.), the design and modulation of the transmission response of an optical system is one of the most basic and important aspects.

[0003] Generally speaking, the transmission response of an optical system is statically invariant in the spectral domain (i.e., the wavelength domain or wavenumber domain). However, through certain technical means, such as modulating the position of a prism using mechanical structures or adjusting the effective refractive index of optical materials, the transmission response of an optical system can be modulated to some extent. However, due to physical limitations such as device power and the inherent properties of the materials, this modulation can usually only be performed on a small scale and with small amplitude.

[0004] Summary of the Invention

[0005] This application aims to address one of the technical problems in related technologies to a certain extent. To this end, this application provides a method, apparatus, system, and readable medium for modulating the response waveform of an optical system.

[0006] As a first aspect of this application, a method for modulating the response waveform of an optical system is provided, wherein the optical system includes a plurality of cascaded optical elements having periodic responses and a plurality of phase modulators respectively disposed on each of the optical elements; the method includes:

[0007] Obtain the target translation amount of the optical system response waveform and the free spectral range (FSR) length of the response waveforms of the plurality of optical elements;

[0008] Based on the target translation amount of the optical system response waveform, the length of each FSR, and the preset translation algorithm, the phase modulation amount of each of the plurality of optical elements is determined;

[0009] The determined phase modulation values ​​are output to the corresponding phase modulators, so that the response waveforms of each optical element are modulated by the phase modulators according to the phase modulation values.

[0010] Optionally, in the step of determining the phase modulation amount of each of the plurality of optical elements based on the target translation amount of the optical system response waveform, the length of each of the FSRs, and a preset translation algorithm, the translation algorithm determines the phase modulation amount of each of the plurality of optical elements using the following formula: mod{ΔD,FSR} i}=Δλ i (t) (a);

[0011] In formulas (a) and (b), ΔD represents the target translation amount of the optical system's response waveform. FSR i Δλ represents the FSR length of the i-th optical element. i (t) represents the wavelength offset of the i-th optical element, mod{ΔD,FSR} i} represents ΔD with respect to FSR i Perform modulo operation. Let t represent the phase modulation amount of the i-th optical element, and t represent time.

[0012] Optionally, after the response waveforms of each optical element are modulated by the plurality of phase modulators according to the plurality of phase modulation amounts, the wavelength offset of the response waveform of each optical element changes periodically with time, and the period of change of the wavelength offset of each optical element and the FSR length of the response waveform of each optical element satisfy the following formula:

[0013] In formula (c), T1:T2:T3:…:T n The wavelength shift periods of the 1st, 2nd, 3rd, ..., nth optical elements are represented sequentially as FSR1, FSR2, FSR3, ..., FSR n The FSR lengths of the response waveforms of the 1st, 2nd, 3rd, ..., nth optical elements are represented sequentially.

[0014] Optionally, obtaining the free spectral range (FSR) length of the response waveforms of the plurality of optical elements includes:

[0015] Obtain the FSR length geometric correlation parameters of the response waveforms of the plurality of optical elements;

[0016] The FSR length of the response waveform of each of the plurality of optical elements is determined based on the FRS length association parameters.

[0017] Optionally, when the optical element is an asymmetric Mach-Zehnder interferometer (MZI) or an asymmetric Michelson interferometer (MI), the FSR length geometric correlation parameter is the difference in arm length between the two arms of the interferometer.

[0018] Optionally, when the optical element is a microring resonator structure, the FSR length geometric correlation parameter is the ring length of the microring resonator structure.

[0019] As a second aspect of the embodiments of this application, an electronic device is provided, wherein the electronic device includes:

[0020] One or more processors;

[0021] A memory having stored one or more computer programs that, when executed by one or more processors, cause the one or more processors to implement the response waveform modulation method for an optical system provided in the first aspect of the present application.

[0022] As a third aspect of the present application, an optical modulation system is provided, wherein the optical modulation system includes an optical system and an electronic device provided in the second aspect of the present application, the optical system including a plurality of cascaded optical elements having periodic responses and a plurality of phase modulators respectively disposed on each of the optical elements;

[0023] The optical element is used to generate a periodic response wave according to the input optical signal; the phase modulator is used to modulate the periodic response wave of the corresponding optical element so that the response waveform of the optical system is shifted in the spectral domain.

[0024] Optionally, the optical element is any of the following: an asymmetric Mach-Zehnder interferometer, a micro-ring structure, an asymmetric Michelson interferometer, or a Fabry-Perot resonator.

[0025] As a fourth aspect of the present application, a computer-readable medium is provided having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the response waveform modulation method of the optical system provided in the first aspect of the present application.

[0026] In the response waveform modulation method of the optical system provided in this application embodiment, the optical system includes multiple cascaded optical elements with periodic responses and multiple phase modulators respectively disposed on each optical element; this can greatly increase the length of the total FSR of the optical system. Furthermore, by obtaining the target translation amount of the optical system response waveform and the FSR length of each of the multiple optical elements, a preset translation algorithm is used to determine the phase modulation amount of each of the multiple optical elements. The determined phase modulation amounts are then output to the corresponding phase modulators, so that the response waveform of each optical element is modulated by the multiple phase modulators according to the multiple phase modulation amounts. This allows the response waveform of the optical system to be linearly shifted significantly within a large range, i.e., the total FSR, even when the modulation range of each optical element is small, while maintaining the shape of the optical system response waveform unchanged. Attached Figure Description

[0027] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0028] Figure 1 is a flowchart of one embodiment of the response waveform modulation method of the optical system provided in this application;

[0029] Figure 2a is a simplified schematic diagram of the optical system provided in an embodiment of this application;

[0030] Figure 2b is a schematic diagram of a response waveform accumulation provided in an embodiment of this application;

[0031] Figure 2c is a schematic diagram of a response waveform translation provided in an embodiment of this application;

[0032] Figure 2d is a schematic diagram of the wavelength shift of the optical element provided in the embodiment of this application changing over time;

[0033] Figure 3 is a flowchart of another embodiment of the response waveform modulation method of the optical system provided in this application;

[0034] Figure 4 is a flowchart of another embodiment of the response waveform modulation method of the optical system provided in this application;

[0035] Figure 5a is a schematic diagram of an optical system with multiple asymmetric Mach-Zehnder interferometers cascaded according to an embodiment of this application.

[0036] Figure 5b is a schematic diagram of another optical system with multiple asymmetric Mach-Zehnder interferometers cascaded according to an embodiment of this application.

[0037] Figure 6 is a schematic diagram of the optical path of the prism system of the asymmetric Michelson interferometer provided in the embodiment of this application;

[0038] Figure 7 is a schematic diagram of an optical system with multiple cascaded microring structures provided in an embodiment of this application;

[0039] Figure 8 is a schematic diagram of the composition of a verification system provided in an embodiment of this application;

[0040] Figure 9 is a block diagram of one embodiment of the electronic device provided in this application;

[0041] Figure 10 is a schematic diagram of a computer-readable medium provided in an embodiment of this application.

[0042] Figure reference numerals: 101: Processor; 102: Memory; 103: I / O interface; 104: Bus Detailed Implementation

[0043] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0044] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0045] Currently, related technologies can only modulate the transmission response of optical systems within a small range and with a small amplitude. In response, the inventors of this application propose that by constructing an optical system with multiple cascaded optical elements having periodic responses, and then simultaneously performing specific modulation on each optical element, the overall response waveform of the optical system can be linearly shifted over a very large range.

[0046] As a first aspect of this application, a method for modulating the response waveform of an optical system is provided, wherein the optical system includes a plurality of cascaded optical elements having periodic responses and a plurality of phase modulators respectively disposed on each of the optical elements; as shown in FIG1, the method may include:

[0047] In step S110, the target translation amount of the optical system response waveform and the free spectral range (FSR) length of the response waveform of each of the plurality of optical elements are obtained;

[0048] In step S120, the phase modulation amount of each of the plurality of optical elements is determined according to the target translation amount of the optical system response waveform, the length of each of the FSRs and the preset translation algorithm;

[0049] In step S130, the determined multiple phase modulation values ​​are output to the corresponding phase modulators, so that the response waveforms of each optical element are modulated by the multiple phase modulators according to the multiple phase modulation values.

[0050] The method provided in this application embodiment is used to modulate the transmission response waveform of an optical system. As shown in FIG2a, which is a simplified schematic diagram of the optical system provided in this application embodiment, it can be seen that the optical system includes a plurality of cascaded optical elements with periodic responses (periodic element 1, periodic element 2, ..., periodic element n shown in FIG2a) and a plurality of phase modulators (not shown in FIG2a) respectively disposed on each of the optical elements.

[0051] Among them, the periodic response of an optical element refers to the periodicity of the response waveform of the optical element in the spectral domain (i.e., the wavelength domain or wavenumber domain), and the period length of the response waveform is the Free Spectral Range (FSR) length.

[0052] In this embodiment of the application, no special limitation is made on the optical element. Any optical element with periodic response is acceptable. For example, the type of optical element may include an asymmetric Mach-Zehnder interferometer (MZI), an asymmetric Michelson interferometer (MI), a micro-ring structure, a Fabry-Pérot cavity (FP), etc.

[0053] In this embodiment, the response waveform of an optical element and the response waveform of an optical system are different terms. The response waveform of an optical element, as the name suggests, refers to the response waveform of the optical element itself, while the response waveform of the optical system is essentially the result of the accumulation of the response waveforms of multiple optical elements. The target translation amount of the optical system response waveform refers to the amount by which the overall response waveform of the optical system needs to be translated. This embodiment does not specifically limit how the target translation amount of the optical system response waveform is obtained; for example, it can be determined according to actual engineering needs.

[0054] The total period length of the response waveform of the optical system, also known as the total FSR length of the optical system response waveform, is the least common multiple of the FSR lengths of the response waveforms of multiple optical elements. When the FSR lengths of the response waveforms of multiple optical elements are different, the response waveform of the optical system will have a larger total FSR length and the waveform will be more complex. For example, if four periodically responding optical elements are cascaded with FSR lengths of 7 nm, 5 nm, 3 nm, and 2 nm, the total FSR length will be LCM(7,5,3,2) = 210 nm. It can be seen that it is very easy to construct an optical system by cascading multiple periodically responding optical elements, so that the total FSR length of the optical system is much greater than the FSR length of any one of the optical elements.

[0055] Figure 2b shows a schematic diagram of response waveform accumulation provided in an embodiment of this application. The response waveforms of each optical element and the optical system have a relationship between wavelength (λ) and photocurrent (|A|). The FSR lengths of the response waveforms of periodic response optical element 1, periodic response optical element 2, periodic response optical element 3, ..., periodic response optical element n are respectively represented as FSR1, FSR2, FSR3, ..., FSR n The total FSR length of the response waveform of an optical system is expressed as FSR. noverall Compared to a single optical element, this optical system has a larger total FSR length in its response waveform. Furthermore, as the number of optical elements increases and the difference in FSR length between multiple optical elements becomes greater, the total FSR length of the optical system's response waveform will also be larger.

[0056] Since the optical system is composed of multiple cascaded optical elements with periodic responses, the response waveform of the optical system has a great degree of design freedom. That is, the response waveform of the entire optical system can be designed by designing the response waveform of each optical element.

[0057] Furthermore, due to the inherent periodicity of each optical element, wavelength changes of multiple optical elements can only occur within their respective FSRs. To address this, the inventors of this application propose that by ensuring the wavelength offset of each optical element remains consistent at any given time, the limitation of the FSR of a single optical element can be broken. This allows for a significant linear shift of the optical system's response waveform within the total FSR while maintaining the transmission response waveform of the optical system unchanged. Figure 2c illustrates a response waveform shift provided in an embodiment of this application. This is achieved by simultaneously providing wavelength offsets Δλ1(t), Δλ2(t), Δλ3(t), ..., Δλn to periodic response optical elements 1, 2, 3, ..., n, respectively. n(t) can cause the response waveform of the entire optical system to shift by Δλ in the wavelength (λ) domain. overall (t).

[0058] By obtaining the FSR length of each of the multiple optical elements and the target translation amount of the optical system response waveform, the phase modulation amount of each of the multiple optical elements can be determined using a preset translation algorithm. Then, by using a phase modulator to modulate the response waveform of each corresponding optical element according to the phase modulation amount, it is possible to provide each optical element with a wavelength offset that remains the same at all times in terms of timing, thereby realizing the translation of the overall response waveform of the optical system.

[0059] In the response waveform modulation method of the optical system provided in this application embodiment, the optical system includes multiple cascaded optical elements with periodic responses and multiple phase modulators respectively disposed on each optical element; this can greatly increase the length of the total FSR of the optical system. Further, by obtaining the target translation amount of the optical system response waveform and the FSR length of each of the multiple optical elements, a preset translation algorithm is used to determine the phase modulation amount of each of the multiple optical elements. The determined phase modulation amounts are then output to the corresponding phase modulators, so that the response waveform of each optical element is modulated by the multiple phase modulators according to the multiple phase modulation amounts. This allows the response waveform of the optical system to be linearly shifted significantly within a large range, i.e., the total FSR, even when the modulation range of each optical element is small, while maintaining the shape of the optical system response waveform unchanged.

[0060] In some embodiments, in the step of determining the phase modulation amount of each of the plurality of optical elements based on the target translation amount of the optical system response waveform, the length of each of the FSRs and a preset translation algorithm, the phase modulation amount of each of the plurality of optical elements is determined by the following formulas (a) and (b): mod{ΔD,FSR i}=Δλ i (t) (a);

[0061] In formulas (a) and (b), ΔD represents the target translation amount of the optical system response waveform, FSR. i Δλ represents the FSR length of the i-th optical element. i (t) represents the wavelength offset of the i-th optical element, mod{ΔD,FSR} i} represents ΔD with respect to FSR i Perform modulo operation. Let t represent the phase modulation amount of the i-th optical element, and t represent time.

[0062] The preset translation algorithm includes formula (a) and formula (b).

[0063] As shown in Figure 3, in this embodiment of the application, the target translation amount of the optical system response waveform and the FSR length of the response waveform of each of the multiple optical elements are first obtained; further, the wavelength offset of each of the multiple optical elements is calculated according to each FSR length and formula (a); further, the phase modulation amount of each of the multiple optical elements is calculated according to each wavelength offset and formula (b); further, each phase modulation amount is output to the corresponding phase modulator; finally, the overall response waveform of the optical system is translated: the target translation amount of the optical system response waveform.

[0064] Mathematically, the response waveform of any optical element i with a periodic response can be described in the wavelength (λ) domain as: T i (λ)=α i +β i (λ) (1);

[0065] In formula (1), α i β is a constant term that does not change with wavelength (i.e., the DC component), while β i (λ) is a periodic term (i.e., an AC component) that varies with wavelength according to a specific period. β i The period length of (λ) is usually described by the concept of the free spectral range (FSR), denoted as FSR. i .

[0066] The response waveform of the entire optical system, which consists of multiple cascaded optical elements with periodic responses, can be written as the cumulative product of the response waveforms of the multiple optical elements:

[0067] In formula (2), n is the total number of optical elements, and T overall (λ) represents the response waveform of the entire optical system.

[0068] The period length of the response waveform of the entire optical system, also known as the total FSR length, is the least common multiple of the FSR lengths of the response waveforms of multiple optical elements: FSR overall =LCM(FSR) i (3) ,i=1,2,……,n;

[0069] In formula (3), LCM(...) represents the calculation of the least common multiple, and FSR overall The FSR represents the total FSR length of the entire optical system's response waveform. i This represents the FSR length of the response waveform of the i-th optical element.

[0070] In summary, when the FSR lengths of the response waveforms of multiple optical elements are different, the response waveform of the optical system will have a larger total FSR length and the waveform will be more complex.

[0071] Figure 2d shows a schematic diagram of the wavelength shift of the optical element provided in the embodiment of this application changing over time. The optical elements are still referred to as FSR1, FSR2, ..., FSR... n Let T represent the FSR lengths of the response waveforms of periodic response optical elements 1, 2, ..., n, respectively. all The total modulation time is represented by the phase modulation amount. After modulating the response waveforms of each optical element according to the phase modulation amount, since each optical element responds periodically and the wavelength shift rate of each stage is the same, the wavelength offset of the response waveform of each optical element will exhibit periodic changes. This period can be called the wavelength offset variation period. Within each wavelength offset variation period, the wavelength of the response waveform of the optical element continues to shift until the wavelength offset variation period ends and the wavelength offset reaches the FSR length. It can be seen that the wavelength offset of the response waveform of each optical element is actually repeated continuously within its FSR length. Due to the periodic characteristics of the optical elements, this repetition causes the response waveform of the entire optical system to be linearly shifted within the total FSR.

[0072] Accordingly, in some embodiments, after the phase modulator modulates the response waveform of each optical element according to the phase modulation amount, the wavelength offset of the response waveform of each optical element changes periodically with time.

[0073] Since the wavelength offset of each optical element remains constant, the time required for each optical element to complete the translation of its own response waveform for one FSR length, i.e., the period of change of the wavelength offset, can be denoted as T. i T of each optical element i The period length (FSR) of the response waveform of each optical element i They have an inverse relationship.

[0074] Accordingly, in some embodiments, the variation period of the wavelength offset of each optical element and the FSR length of the response waveform of each optical element satisfy formula (c):

[0075] In formula (c), T1, T2, T3, ..., T n The wavelength shift periods of the 1st, 2nd, 3rd, ..., nth optical elements are represented sequentially as FSR1, FSR2, FSR3, ..., FSR n The FSR lengths of the response waveforms of the 1st, 2nd, 3rd, ..., nth optical elements are represented sequentially.

[0076] The total modulation time T all Will satisfy:

[0077] The wavelength shift Δλ in the timing sequence i Substituting (t) into formula (2) above, we get:

[0078] If we denote the initial time as t0, and consider the wavelength offset at the initial moment as 0, then the above formula (5) can be further rewritten in incremental form as follows:

[0079] In formula (6), Δt and Δλ represent the time increment and wavelength increment, respectively, T all T represents the total modulation time. overall (...) represents the response waveform of the entire optical system. C is a constant that depends on the offset modulation rate (which corresponds to the above formula (c)); the ranges of Δt and Δλ are 0 ≤ Δt ≤ T, respectively. all , and 0≤Δλ≤FSR overall In other words, when the modulation time progresses from 0 to T... all At that time, the response waveform of the entire optical system can complete one FSR. overall Translation.

[0080] Typically, the FSR length of an optical element is determined by both its geometric parameters and group refractive index. However, in a chip comprising multiple optical elements with periodic responses, the group refractive index of these different periodic optical elements is the same. Therefore, it is possible to determine the FSR length of the response waveforms of the multiple optical elements based solely on their geometric parameters. Accordingly, in some embodiments, obtaining the free spectral range FSR length of the response waveforms of the multiple optical elements (i.e., the part involved in step S110), as shown in Figure 4, may include:

[0081] In step S210, the FSR length geometric correlation parameters of the response waveforms of the plurality of optical elements are obtained;

[0082] In step S220, the FSR length of the response waveform of each of the plurality of optical elements is determined according to the FRS length association parameter.

[0083] As mentioned above, this application does not impose any special limitation on the optical elements with periodic responses; any optical element with a periodic response is acceptable. For example, the type of optical element may include asymmetric Mach-Zehnder interferometers, asymmetric Michelson interferometers, micro-ring structures, Fabry-Perot cavities, etc. These periodic optical elements are widely used in related technologies. However, how to utilize these periodic optical elements to construct an optical system whose response waveform can be linearly shifted over a very large range is crucial.

[0084] In this embodiment, the multiple optical elements in the optical system can be any or any combination of asymmetric Mach-Zehnder interferometers, asymmetric Michelson interferometers, microring structures, and Fabry-Perot cavities. That is, this embodiment is not limited to using a single type of periodically responsive optical element to construct the optical system; multiple types of periodically responsive optical elements can also be used simultaneously to construct the optical system.

[0085] It should be noted that different types of optical elements with periodic responses may have different FSR length geometric correlation parameters.

[0086] In some embodiments, when the optical element is an asymmetric Mach-Zehnder interferometer (MZI) or an asymmetric Michelson interferometer (MI), the FSR length geometric correlation parameter is the difference in arm length between the two arms of the interferometer.

[0087] When the optical element is an asymmetric Mach-Zehnder interferometer (MZI), the FSR length of the MZI can be determined by the difference in arm lengths between the two arms of the MZI. Furthermore, adjacent asymmetric Mach-Zehnder interferometers can be connected via their respective beam-splitting elements or by sharing a single beam-splitting element. Figure 5a shows a schematic diagram of an optical system with multiple cascaded asymmetric Mach-Zehnder interferometers provided in this embodiment of the application. Each Mach-Zehnder interferometer has two phase modulators, and every two adjacent Mach-Zehnder interferometers are connected via their respective beam-splitting elements. Figure 5b shows another schematic diagram of an optical system with multiple cascaded asymmetric Mach-Zehnder interferometers provided in this embodiment of the application. Each Mach-Zehnder interferometer has two phase modulators, and every two adjacent Mach-Zehnder interferometers are connected by sharing a single beam-splitting element.

[0088] When the optical element is an asymmetric Michelson interferometer (MI), the FSR length of the MI can be determined by the difference in arm lengths between the two arms of the MI, as shown in Figure 6. This figure is a schematic diagram of a prism system for an asymmetric Michelson interferometer provided in this application embodiment. The MI utilizes the prism system to achieve the transmission response to the input optical signal. The Michelson interferometer consists of three optical elements: a beam splitter (50:50 semi-transparent mirror), a movable plane mirror (total reflection mirror (adjustable optical path)), and a fixed plane mirror (total reflection mirror). The 50:50 semi-transparent mirror splits a beam of light into two beams of equal intensity: reflected light and transmitted light. The total reflection mirror reflects the reflected light. The total reflection mirror (adjustable optical path) reflects the transmitted light and simultaneously adjusts the FSR of the MI by adjusting its position.

[0089] In some embodiments, when the optical element is a microring resonator structure, the FSR length geometric correlation parameter is the ring length of the microring resonator structure.

[0090] When the optical element is a microring resonator structure, the FSR length of the microring resonator structure can be determined by the ring length of the microring resonator structure, as shown in Figure 7, which is a schematic diagram of an optical system with multiple cascaded microring resonator structures provided in an embodiment of this application. Each microring structure is provided with a phase modulator and a beam splitter connected to its bottom.

[0091] In this embodiment, these optical components can be integrated into different optical platforms, such as silicon-based optical platforms (pure silicon or silicon-germanium platforms), silicon nitride (SiN) optical platforms, group III-V optical platforms such as indium phosphide (InP) or indium arsenide (InAs), lithium phosphate (LN) optical platforms, and so on. Of course, the optical platform can also be constructed within an optical fiber system using fiber arms of different lengths, fiber splitters, and fiber mirrors.

[0092] In this embodiment, the phase modulator disposed on an optical element with a periodic response, such as an asymmetric Mach-Zehnder interferometer, a micro-ring resonator structure, or an asymmetric Michelson interferometer (MI), can be implemented based on any of the following effects: the thermo-optic effect, electro-optic effect, or nonlinear effect of the integrated waveguide or optical fiber. Furthermore, the specific arrangement of the phase modulator on the asymmetric Mach-Zehnder interferometer is not specifically limited. For example, the phase modulator can be disposed on both arms of the asymmetric Mach-Zehnder interferometer, or it can be disposed on only one arm of the asymmetric Mach-Zehnder interferometer. Moreover, the beam splitter connected between two adjacent periodically responding optical elements is not specifically limited. For example, the beam splitter can be various common waveguide or fiber beam splitters such as directional couplers, multimode interferometers (MMIs), etc.

[0093] In this embodiment, the type of microring resonator structure can include various common microrings and their variants, such as single-port through microrings, dual-port add-drop microrings, vernier microrings, micro disk microrings, racetrack microrings, curve directional coupler based microrings, and so on.

[0094] Furthermore, the inventors of this application also provide a verification system for verifying the proposed optical system and its response waveform modulation method. Figure 8 shows a schematic diagram of the verification system provided in an embodiment of this application. An integrated chip with a six-level asymmetric Mach-Zehnder interferometer is fabricated on a silicon nitride integrated platform. An amplified spontaneous emission (ASE) light source is used as the incident light source for the chip. A computer and driver program control the drive circuit to control the wavelength shift of each interferometer, achieving an overall translation of the response waveform. An optical spectrometer is used to measure the final response waveform of the multi-level Mach-Zehnder interferometer chip based on the integrated optical path. Actual measurement results show that the response waveform did indeed shift, and within a wavelength range exceeding 100 nanometers, the response waveform of the entire optical system achieved a uniform linear shift while maintaining its shape.

[0095] As a second aspect of this application, an electronic device is provided, wherein, as shown in FIG9, the electronic device includes:

[0096] One or more processors 101;

[0097] The memory 102 stores one or more computer programs that, when executed by the one or more processors 101, cause the one or more processors 101 to implement the response waveform modulation method for the optical system provided in the first aspect of the embodiments of this application.

[0098] The electronic device may also include one or more I / O interfaces 103 connected between the processor 101 and the memory 102, configured to enable information interaction between the processor 101 and the memory 102.

[0099] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read-write interface) is connected between the processor and the memory, enabling information exchange between the processor and the memory, including but not limited to a data bus (Bus).

[0100] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0101] As a third aspect of the present application, an optical modulation system is provided. The optical modulation system includes an optical system and an electronic device according to a second aspect of the present application. The optical system includes a plurality of cascaded optical elements having periodic responses and a plurality of phase modulators respectively disposed on each of the optical elements. The optical elements are used to generate periodic response waves according to an input optical signal. The phase modulators are used to modulate the periodic response waves of the corresponding optical elements so that the overall response waveform of the optical system is shifted in the spectral domain.

[0102] As shown in Figure 2a, the optical system includes a plurality of cascaded optical elements with periodic responses (periodic element 1, periodic element 2, ..., periodic element n shown in Figure 2a), and a plurality of phase modulators (not shown in Figure 2a) respectively disposed on each of the optical elements.

[0103] In some embodiments, the optical element is any of the following: an asymmetric Mach-Zehnder interferometer, a microring structure, an asymmetric Michelson interferometer, or a Fabry-Perot resonator.

[0104] In this embodiment, the multiple optical elements in the optical system can be any or any combination of asymmetric Mach-Zehnder interferometers, asymmetric Michelson interferometers, microring structures, and Fabry-Perot cavities. That is, this embodiment is not limited to using a single type of periodically responsive optical element to construct the optical system; multiple types of periodically responsive optical elements can also be used simultaneously to construct the optical system.

[0105] As a fourth aspect of the present application, as shown in FIG10, a computer-readable medium is provided having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the response waveform modulation method of the optical system provided in the first aspect of the present application.

[0106] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. Accordingly, the computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can implement the methods of any of the above embodiments. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0107] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. A method for modulating the response waveform of an optical system, characterized in that, The optical system includes a plurality of cascaded optical elements with periodic responses and a plurality of phase modulators respectively disposed on each of the optical elements; the method includes: Obtain the target translation amount of the optical system response waveform and the free spectral range (FSR) length of the response waveforms of the plurality of optical elements; Based on the target translation amount of the optical system response waveform, the length of each FSR, and the preset translation algorithm, the phase modulation amount of each of the plurality of optical elements is determined; The determined phase modulation values ​​are output to the corresponding phase modulators, so that the response waveforms of each optical element are modulated by the phase modulators according to the phase modulation values.

2. The method according to claim 1, characterized in that, In the step of determining the phase modulation amount of each of the plurality of optical elements based on the target translation amount of the optical system response waveform, the length of each of the FSRs, and the preset translation algorithm, the phase modulation amount of each of the plurality of optical elements is determined by the following formula: mod{ΔD,FSR} i }=Δλ i (t) (a); In formulas (a) and (b), ΔD represents the target translation amount of the optical system response waveform, FSR. i Δλ represents the FSR length of the i-th optical element. i (t) represents the wavelength offset of the i-th optical element, mod{ΔD,FSR} i } represents ΔD with respect to FSR i Perform modulo operation. Let t represent the phase modulation amount of the i-th optical element, and t represent time.

3. The method according to claim 1, characterized in that, After the response waveforms of each optical element are modulated by the multiple phase modulators according to the multiple phase modulation amounts, the wavelength offset of the response waveform of each optical element changes periodically with time. The period of change of the wavelength offset of each optical element and the FSR length of the response waveform of each optical element satisfy the following formula: In formula (c), T1, T2, T3, ..., T n The wavelength shift periods of the 1st, 2nd, 3rd, ..., nth optical elements are represented sequentially as FSR1, FSR2, FSR3, ..., FSR n The FSR lengths of the response waveforms of the 1st, 2nd, 3rd, ..., nth optical elements are represented sequentially.

4. The method according to claim 1, characterized in that, Obtaining the free spectral range (FSR) length of the response waveforms of the plurality of optical elements includes: Obtain the FSR length geometric correlation parameters of the response waveforms of the plurality of optical elements; The FSR length of the response waveform of each of the plurality of optical elements is determined based on the FRS length association parameters.

5. The method according to any one of claims 1-4, characterized in that, When the optical element is an asymmetric Mach-Zehnder interferometer (MZI) or an asymmetric Michelson interferometer (MI), the FSR length geometric correlation parameter is the difference in arm length between the two arms of the interferometer.

6. The method according to any one of claims 1-4, characterized in that, When the optical element is a microring resonator structure, the FSR length geometric correlation parameter is the ring length of the microring resonator structure.

7. An electronic device, characterized in that, The electronic device includes: One or more processors; A memory having stored one or more computer programs thereon, which, when executed by one or more processors, cause the one or more processors to implement the response waveform modulation method of the optical system according to any one of claims 1-6.

8. An optical modulation system, characterized in that, The optical modulation system includes an optical system and an electronic device according to claim 7, wherein the optical system includes a plurality of cascaded optical elements having periodic responses and a plurality of phase modulators respectively disposed on each of the optical elements; The optical element is used to generate a periodic response wave according to the input optical signal; The phase modulator is used to modulate the periodic response wave of the corresponding optical element so that the response waveform of the optical system is shifted in the spectral domain.

9. The optical modulation system according to claim 8, characterized in that, The optical element is any of the following: an asymmetric Mach-Zehnder interferometer, a micro-ring resonator structure, an asymmetric Michelson interferometer, or a Fabry-Perot resonator.

10. A computer-readable medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the response waveform modulation method of the optical system according to any one of claims 1-6.

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