CN114609726A - Ultra-narrow band filtering method based on-harmonic chip integrated cascade filter - Google Patents
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- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
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Abstract
The invention discloses an ultra-narrow band filtering method based on an on-harmonic chip integrated cascade filter. The invention can improve the performance of the chip integrated filter through system optimization design based on the prior art level, effectively solves the problems of large full width at half maximum, small extinction ratio and the like of the chip integrated filter, greatly improves the frequency domain processing capability of the chip integrated optical circuit, and lays a solid foundation for research, development, application and performance upgrading of a chip integrated photoelectric information system.
Description
Technical Field
The invention belongs to the interdisciplinary field of integrated optics, optical communication and microwave photonics, in particular to a method for realizing ultra-narrow band filtering by cascading a plurality of chip integrated filters with the same structure, independent regulation and control and center wavelength coincidence, and particularly relates to an ultra-narrow band filtering method, system and storage medium based on-harmonic chip integrated cascaded filters.
Background
The photoelectric information system is a complex system composed of photoelectric devices and realizing information functions through optical effects, and comprises an optical communication system, an optical switching system, an all-optical signal processing system, a microwave optical subsystem and the like. In a traditional photoelectric information system, an optical field carrying information is transmitted in a free space or an optical fiber and is controlled by a discrete photoelectric device or an all-fiber photoelectric device, and when the system is large in scale, the system faces a plurality of problems of large size, high power consumption, poor stability, high failure rate, difficult coordination, slow upgrading and the like. Therefore, the chip integrated photoelectric information system has attracted much attention in recent years, and on one hand, the chip integrated photoelectric information system benefits from the advantages of small size, low power consumption, strong function, stable performance, batch preparation, integrated circuit board and the like, and on the other hand, the chip integrated optical circuit is highly compatible with the preparation process of the traditional chip integrated circuit, so that the photoelectric hybrid integrated chip is more and more a preferred technical scheme for large-scale application.
The optical filter has important application value in the fields of wavelength division multiplexing optical communication, optical Fourier transform, microwave photon signal shaping, quantum key distribution, nonlinear optical frequency comb light sources and the like. However, compared with the free space filter, the chip integrated filter generally faces short plates with large full width at half maximum, small extinction, poor tuning performance and the like, and the chip integrated microcavity is difficult to achieve the parameter precision compared with the free space optical film.
Disclosure of Invention
Based on the problems in the prior art, the technical problem to be solved by the invention is how to integrate a plurality of discrete filters with the same structure on a single chip, and the integrated filter function of the chip with the half-height and the full-width greatly compressed and the extinction ratio multiplied is realized by cascading transmission waveguides and independently controlling the central wavelength of each filter to be strictly coincided (meeting the harmonic condition) by using the bias voltage loaded by a control electrode.
In order to achieve the above effect, the ultra-narrow band filtering method based on the harmonic chip integrated cascade filter provided by the invention comprises the following steps:
the method comprises the following steps of firstly, preparing, cascading and independently controlling filters, preparing and integrating a plurality of discrete filters with the same structure on a single chip, realizing independent tuning of the central wavelength of each filter through an external bias voltage, and cascading each filter by using a chip integrated waveguide;
and step two, ultra-narrow band filtering is implemented, the central wavelength of each filter is accurately regulated and controlled by controlling bias voltage, the full width at half maximum is greatly compressed, and the extinction ratio is multiplied.
Preferably, the method specifically comprises:
s101, preparing a grating coupler to lead a signal light field into or out of a chip;
s102, preparing control electrodes of each filter, and connecting the control electrodes with the pin electrodes by using integrated wires;
and S103, loading the control voltage to each filter through the pin electrode to obtain an ultra-narrow band filtering effect.
Preferably, in S101, filters with the same structure are prepared by a standard process of a chip integrated optical circuit, filter cascade is realized by a transmission waveguide, and a grating coupler is prepared to introduce or export a signal optical field into or out of a chip.
Preferably, in S102, each filter control electrode is prepared according to the standard of the chip integrated circuit, and the control electrode is connected to the pin electrode by using an integrated wire.
Preferably, in step S103, the control voltage is applied to each filter through the pin electrode, and the central wavelength of each filter is adjusted to obtain the ultra-narrow band filtering effect with the extinction ratio increased by multiple times and the full width at half maximum greatly compressed.
Preferably, a plurality of filters with the same structure are prepared and cascaded on the same chip, the central wavelength of each filter is controlled through a chip integrated circuit, and ultra-narrow band filtering with high extinction ratio is realized.
Preferably, the optical waveguide is prepared by a standard process of a chip integrated optical path, has a certain structural design freedom degree, transmits an optical field efficiently and losslessly, has a certain band-pass or band-stop capability in a frequency domain, and realizes transmission spectrum tuning by changing the refractive index of the waveguide.
Preferably, the filter is prepared by a chip integrated circuit standard process, has certain structural design freedom, changes the refractive index of a transmission waveguide in the filter structure to realize the central wavelength tuning of the filter, and is connected to an external logic circuit through a control electrode, an integrated lead and a pin electrode to receive bias voltages with different intensities.
A system for realizing the ultra-narrow band filtering method based on the harmonic chip integrated cascade filter comprises the following steps:
the system comprises a preparation, cascade connection and independent control subsystem of the filter, a central wavelength tuning subsystem of the filter and a central wavelength tuning subsystem of the filter, wherein the preparation, cascade connection and independent control subsystem of the filter is used for preparing and integrating a plurality of discrete filters with the same structure on a single chip, realizing the independent tuning of the central wavelength of each filter by external bias voltage and cascading each filter by utilizing a chip integrated waveguide;
the ultra-narrow band filtering implementation subsystem is used for accurately regulating and controlling the central wavelength of each filter by controlling bias voltage, greatly compressing full width at half maximum and increasing extinction ratio in multiples;
the system prepares filters with the same structure through a standard process of a chip integrated optical circuit, realizes filter cascade through transmission waveguides, and prepares a grating coupler to lead a signal optical field into or out of a chip; preparing control electrodes of each filter according to a chip integrated circuit standard, and connecting the control electrodes with the pin electrodes by using integrated wires; loading control voltage to each filter through a pin electrode, and obtaining an ultra-narrow band filtering effect with the extinction ratio increased in multiples and the full width at half maximum greatly compressed by adjusting the central wavelength of each filter;
the ultra-narrow band filter realized by the system consists of a grating coupler, a carrier straight waveguide, a plurality of micro-rings (a first micro-ring, a second micro-ring, a third micro-ring, a fourth micro-ring, a fifth micro-ring, a sixth micro-ring, a seventh micro-ring and an eighth micro-ring), a plurality of band-pass filters, a plurality of micro-ring filters and a plurality of band-stop filters, wherein a signal light field enters the carrier straight waveguide through the grating coupler, enters the first micro-ring through evanescent wave coupling, and is output from the same carrier straight waveguide and different carrier straight waveguides at equal probability; the output spectrum of the same carrier straight waveguide shows the characteristic of band-stop filtering, and the output spectrum of different carrier straight waveguides shows the characteristic of band-pass filtering; according to the sequence of a first micro-ring, a same carrier straight waveguide, a second micro-ring, different carrier straight waveguides, a third micro-ring, different carrier straight waveguides, a fourth micro-ring and different carrier straight waveguides, a signal light field passes through four band-pass filters; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelengths of each micro-ring filter are consistent, and the grating coupler outputs an ultra-narrow band-pass filtering spectrum with the extinction ratio increased in multiples and the full width at half maximum greatly compressed; according to the sequence of the first micro-ring, the same carrier straight waveguide, the fifth micro-ring, the same carrier straight waveguide, the sixth micro-ring, the same carrier straight waveguide, the seventh micro-ring and the same carrier straight waveguide, a signal light field passes through the four band-stop filters, and by adjusting the bias voltage loaded on the control electrode, an ultra-narrow band-stop filtering spectrum with the extinction ratio increased in multiples and the full width at half maximum greatly compressed can be output by the lower right corner grating coupler.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
Compared with the prior art, the invention can realize the performance improvement of the chip integrated filter through the design of the chip integrated optical circuit based on the current state of the process level, provides a feasible technical thought for the chip integrated ultra-narrow band filter, greatly improves the frequency domain resolution precision and the spectrum regulation and control capability of the chip integrated optical circuit, and lays a solid foundation for the research, development and application and the performance upgrading of a chip integrated photoelectric information system.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an ultra-narrow band filter based on a cascaded micro-ring according to the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in 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 are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides an embodiment of an ultra-narrow band filtering method based on an on-harmonic chip integrated cascade filter, which comprises the following steps:
step one, preparation, cascade connection and independent control of filters, wherein a plurality of discrete filters with the same structure are integrated on a single chip, independent tuning of the central wavelength of each filter is realized through external bias voltage, and each filter is cascaded by utilizing a chip integrated waveguide;
and step two, ultra-narrow band filtering is implemented, the central wavelength of each filter is accurately regulated and controlled by controlling bias voltage, the full width at half maximum is greatly compressed, and the extinction ratio is multiplied.
In some embodiments, the method specifically comprises:
s101, preparing a grating coupler to lead a signal light field into or out of a chip;
s102, preparing control electrodes of each filter, and connecting the control electrodes with the pin electrodes by using integrated wires;
and S103, loading the control voltage to each filter through the pin electrode to obtain an ultra-narrow band filtering effect.
In some embodiments, S101 prepares a filter with the same structure through a standard process of a chip integrated optical circuit, and implements filter cascade through a transmission waveguide, and prepares a grating coupler to guide a signal optical field into or out of a chip.
In some embodiments, S102 prepares each filter control electrode by the standard of the chip integrated circuit, and connects the control electrode to the pin electrode by using the integrated wire.
In some embodiments, S103 loads a control voltage to each filter through the pin electrode, and obtains an ultra-narrow band filtering effect with an extinction ratio increased by multiple times and a substantially compressed full width at half maximum by adjusting a center wavelength of each filter.
In some embodiments, a plurality of filters with the same structure are prepared and cascaded on the same chip, the central wavelength of each filter is controlled through a chip integrated circuit, and ultra-narrow band filtering with high extinction ratio is realized.
In some embodiments, the optical waveguide is prepared by a standard chip integrated optical circuit process, has a certain structural design freedom, transmits an optical field efficiently and losslessly, has a certain band-pass or band-stop capability in a frequency domain, and realizes transmission spectrum tuning by changing the refractive index of the waveguide.
In some embodiments, the filter is prepared by a chip integrated circuit standard process, has a certain structural design freedom, changes the refractive index of a transmission waveguide in the filter structure to realize the central wavelength tuning of the filter, and is connected to an external logic circuit through a control electrode, an integrated wire and a pin electrode to receive bias voltages with different intensities.
The invention provides a system for realizing the ultra-narrow band filtering method based on the harmonic chip integrated cascade filter, which comprises the following steps:
the system comprises a preparation, cascade connection and independent control subsystem of the filter, a central wavelength tuning subsystem and a central wavelength tuning subsystem, wherein the preparation, cascade connection and independent control subsystem of the filter is used for preparing and integrating a plurality of discrete filters with the same structure on a single chip, realizing independent tuning of the central wavelength of each filter by external bias voltage and cascading each filter by using a chip integrated waveguide;
the ultra-narrow band filtering implementation subsystem is used for accurately regulating and controlling the central wavelength of each filter by controlling bias voltage, greatly compressing full width at half maximum and increasing extinction ratio in multiples;
the system prepares filters with the same structure through a standard process of a chip integrated optical circuit, realizes filter cascade through transmission waveguides, and prepares a grating coupler to lead a signal optical field into or out of a chip; preparing control electrodes of each filter according to a chip integrated circuit standard, and connecting the control electrodes with the pin electrodes by using integrated wires; loading control voltage to each filter through a pin electrode, and obtaining an ultra-narrow band filtering effect with the extinction ratio increased in multiples and the full width at half maximum greatly compressed by adjusting the central wavelength of each filter;
the ultra-narrow band filter realized by the system consists of a grating coupler, a carrier straight waveguide, a plurality of micro-rings (a first micro-ring, a second micro-ring, a third micro-ring, a fourth micro-ring, a fifth micro-ring, a sixth micro-ring, a seventh micro-ring and an eighth micro-ring), a plurality of band-pass filters, a plurality of micro-ring filters and a plurality of band-stop filters, wherein a signal light field enters the carrier straight waveguide through the grating coupler, enters the first micro-ring through evanescent wave coupling, and is output from the same carrier straight waveguide and different carrier straight waveguides at equal probability; the output spectrum of the same carrier straight waveguide shows the characteristic of band-stop filtering, and the output spectrum of different carrier straight waveguides shows the characteristic of band-pass filtering; according to the sequence of a first micro-ring, a same carrier straight waveguide, a second micro-ring, different carrier straight waveguides, a third micro-ring, different carrier straight waveguides, a fourth micro-ring and different carrier straight waveguides, a signal light field passes through four band-pass filters; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelengths of each micro-ring filter are consistent, and at the moment, the upper right-corner grating coupler outputs an ultra-narrow band-pass filter spectrum with the extinction ratio (the ratio of the maximum value to the minimum value of the transmittance) increased in multiples and the full width at half maximum (the bandwidth range corresponding to the maximum value and half time of the transmittance) greatly compressed; according to the sequence of the first micro-ring, the same carrier straight waveguide, the fifth micro-ring, the same carrier straight waveguide, the sixth micro-ring, the same carrier straight waveguide, the seventh micro-ring and the same carrier straight waveguide, a signal light field passes through the four band-stop filters, and by adjusting the bias voltage loaded on the control electrode, an ultra-narrow band-stop filtering spectrum with the extinction ratio increased in multiples and the full width at half maximum greatly compressed can be output by the lower right corner grating coupler.
As shown in fig. 1, the present invention provides an embodiment of an ultra-narrowband filter based on a cascaded micro-ring, in which a signal light field enters a carrier straight waveguide through a grating coupler at the lower left corner, enters a micro-ring 1 through evanescent coupling, and is output from a straight-through side (the same carrier straight waveguide) and a download side (different carrier straight waveguides) at equal probability; the output spectrum of the direct side shows the characteristic of band-stop filtering, and the output spectrum of the download side shows the characteristic of band-pass filtering. In the order of the microring 1 → the download side → the microring 2 → the download side → the microring 3 → the download side → the microring 4 → the download side, the signal light field will pass through the four band pass filters; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelengths of each micro-ring filter are consistent, and at the moment, the upper right-corner grating coupler outputs an ultra-narrow band-pass filtering spectrum with the extinction ratio (the ratio of the maximum value to the minimum value of the transmittance) increased in multiples and the full width at half maximum (the bandwidth range corresponding to the maximum value and half of the transmittance) greatly compressed. Similarly, according to the sequence of the micro-ring 1 → the straight-through side → the micro-ring 5 → the straight-through side → the micro-ring 6 → the straight-through side → the micro-ring 7 → the straight-through side, the signal light field passes through the four band-stop filters, and by adjusting the bias voltage loaded on the control electrode, the ultra-narrow band-stop filtering spectrum with the extinction ratio increased by times and the full width at half maximum greatly compressed can be output by the grating coupler at the lower right corner.
The invention provides an embodiment of an ultra-narrow band filtering method based on an integrated cascade filter on a harmonic chip. The invention can realize the performance improvement of the chip integrated filter through the design of the chip integrated optical circuit based on the current state of the process level, provides a feasible technical thought for the chip integrated ultra-narrow band filter, greatly improves the frequency domain resolution precision and the spectrum regulation and control capability of the chip integrated optical circuit, and lays a solid foundation for the research, development, application and performance upgrading of a chip integrated photoelectric information system.
In some embodiments, the chip integrated filter can be manufactured by a standard process of a chip integrated optical circuit, has a certain structural design freedom, can efficiently and losslessly transmit an optical field, has a certain band-pass or band-stop capability in a frequency domain, can realize transmission spectrum tuning by changing a waveguide refractive index, and has tuning basic principles including but not limited to a thermo-optic effect, an electro-optic effect, a photoelectric effect and the like, typical structures include but not limited to a micro-ring cavity, an echo wall micro-disc cavity, a photonic crystal slow-light micro-cavity and the like, a cascaded filter can have the same structure or different structures, a used material platform includes but not limited to silicon on an insulator, hydrogen-loaded amorphous silicon, silicon nitride, silicon carbide, chalcogenide glass, three-five groups of aluminum gallium arsenic, three-five groups of indium phosphide and the like, and a single material integration method or a multi-material mixed integration method can be adopted.
In some embodiments, the chip integrated circuit can be prepared by a chip integrated circuit standard process, has a certain degree of structural design freedom, can change the refractive index of a transmission waveguide in a filter structure to realize the central wavelength tuning of the filter, can be connected to an external logic circuit through a control electrode-integrated wire-pin electrode, can receive bias voltages with different intensities, and does not limit the structural size and wiring parameters of the control electrode, the integrated wire and the pin electrode.
In some embodiments, the ultra-narrow band filtering can realize the functions of increasing the extinction ratio, compressing the full width at half maximum and the like by changing the distribution of bias voltages on a plurality of control electrodes, the central wavelengths of all filters need to be completely overlapped, and the optimal parameters of the full width at half maximum, the extinction ratio and the filtering spectrum are not limited.
Compared with the prior art, the invention has the following advantages:
firstly, the problems of large full width at half maximum, small extinction ratio, small tuning freedom degree and the like commonly encountered by a chip integrated filter are solved, a feasible technical scheme is provided for the chip integrated ultra-narrow band filter, and the frequency domain precision of the chip integrated filter is greatly improved;
secondly, the ultra-narrow band filtering method expands the tuning freedom degree from the central wavelength to other parameters such as the shape of a filtering spectrum, the full width at half maximum, the extinction ratio and the like, and greatly improves the frequency domain signal processing capability of the chip integrated photoelectric information system;
in addition, the ultra-narrow band filtering method is highly compatible with the existing preparation process level, the performance of the chip integrated filter is improved through the design of the chip integrated optical path, the engineering practicability is higher, and a solid foundation can be laid for the research and development application and the performance upgrading of a chip integrated photoelectric information system.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An ultra-narrow band filtering method based on-harmonic-chip integrated cascade filters comprises the following steps:
the method comprises the following steps of firstly, preparing, cascading and independently controlling filters, preparing and integrating a plurality of discrete filters with the same structure on a single chip, realizing independent tuning of the central wavelength of each filter through an external bias voltage, and cascading each filter by using a chip integrated waveguide;
and step two, ultra-narrow band filtering is implemented, the central wavelength of each filter is accurately regulated and controlled by controlling bias voltage, the full width at half maximum is greatly compressed, and the extinction ratio is multiplied.
2. The ultra-narrow band filtering method based on-chip integrated cascade filter according to claim 1, wherein the method specifically comprises:
s101, preparing a grating coupler to lead a signal light field into or out of a chip;
s102, preparing control electrodes of each filter, and connecting the control electrodes with the pin electrodes by using integrated wires;
and S103, loading the control voltage to each filter through the pin electrode to obtain an ultra-narrow band filtering effect.
3. The ultra-narrow band filtering method based on-chip integrated cascade filter as claimed in claim 2, wherein said S101 is implemented by preparing filters with the same structure through standard processes of chip integrated optical circuit, implementing filter cascade through transmission waveguide, and preparing grating coupler to lead signal optical field into or out of chip.
4. The ultra-narrow band filtering method based on-chip integrated cascade filter of claim 2, wherein S102 prepares each filter control electrode by chip integrated circuit standard, and connects the control electrode with the pin electrode by using an integrated wire.
5. The ultra-narrow band filtering method based on-chip integrated cascade filter as claimed in claim 2, wherein said S103 loads control voltage to each filter through pin electrode, and obtains ultra-narrow band filtering effect with extinction ratio increased by multiple times and full width at half maximum compressed by adjusting center wavelength of each filter.
6. The ultra-narrow band filtering method based on-chip integrated cascade filter as claimed in one of claims 1 to 5, wherein a plurality of filters with the same structure are prepared and cascaded on the same chip, and the central wavelength of each filter is controlled by a chip integrated circuit to realize ultra-narrow band filtering with high extinction ratio.
7. The ultra-narrow band filtering method based on-chip integrated cascade filter as claimed in one of claims 1 to 5, characterized in that, the ultra-narrow band filtering method is prepared by standard process of chip integrated optical circuit, has a certain degree of freedom of structural design, transmits optical field efficiently and losslessly, has a certain band-pass or band-stop capability in frequency domain, and realizes transmission spectrum tuning by changing refractive index of waveguide.
8. The ultra-narrow band filtering method based on-chip integrated cascade filter as claimed in one of claims 1 to 5, characterized in that, the ultra-narrow band filtering method is prepared by standard chip integrated circuit process, has a certain degree of freedom of structural design, changes the refractive index of transmission waveguide in the filter structure to realize the tuning of the central wavelength of the filter, and is connected to an external logic circuit through a control electrode, an integrated wire and a pin electrode to receive bias voltages with different intensities.
9. A system for implementing the ultra-narrow band filtering method based on-chip integrated cascade filters as claimed in claims 1-8, comprising:
the system comprises a preparation, cascade connection and independent control subsystem of the filter, a central wavelength tuning subsystem and a central wavelength tuning subsystem, wherein the preparation, cascade connection and independent control subsystem of the filter is used for preparing and integrating a plurality of discrete filters with the same structure on a single chip, realizing independent tuning of the central wavelength of each filter by external bias voltage and cascading each filter by using a chip integrated waveguide;
the ultra-narrow band filtering implementation subsystem is used for accurately regulating and controlling the central wavelength of each filter by controlling bias voltage, greatly compressing full width at half maximum and increasing extinction ratio in multiples;
the system prepares filters with the same structure through a standard process of a chip integrated optical circuit, realizes filter cascade through transmission waveguides, and prepares a grating coupler to lead a signal optical field into or out of a chip; preparing control electrodes of each filter according to the standard of a chip integrated circuit, and connecting the control electrodes with pin electrodes by using integrated wires; loading control voltage to each filter through a pin electrode, and obtaining an ultra-narrow band filtering effect with the extinction ratio increased in multiples and the full width at half maximum greatly compressed by adjusting the central wavelength of each filter;
the ultra-narrow band filter realized by the system consists of a grating coupler, a carrier straight waveguide, a plurality of micro-rings (a first micro-ring, a second micro-ring, a third micro-ring, a fourth micro-ring, a fifth micro-ring, a sixth micro-ring, a seventh micro-ring and an eighth micro-ring), a plurality of band-pass filters, a plurality of micro-ring filters and a plurality of band-stop filters, wherein a signal light field enters the carrier straight waveguide through the grating coupler, enters the first micro-ring through evanescent wave coupling, and is output from the same carrier straight waveguide and different carrier straight waveguides at equal probability; the output spectrum of the same carrier straight waveguide shows the characteristic of band-stop filtering, and the output spectrum of different carrier straight waveguides shows the characteristic of band-pass filtering; according to the sequence of a first micro-ring, a same carrier straight waveguide, a second micro-ring, different carrier straight waveguides, a third micro-ring, different carrier straight waveguides, a fourth micro-ring and different carrier straight waveguides, a signal light field passes through four band-pass filters; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelengths of each micro-ring filter are consistent, and the grating coupler outputs an ultra-narrow band-pass filtering spectrum with the extinction ratio increased in multiples and the full width at half maximum greatly compressed; according to the sequence of the first micro-ring, the same carrier straight waveguide, the fifth micro-ring, the same carrier straight waveguide, the sixth micro-ring, the same carrier straight waveguide, the seventh micro-ring and the same carrier straight waveguide, a signal light field passes through the four band-stop filters, and by adjusting the bias voltage loaded on the control electrode, an ultra-narrow band-stop filtering spectrum with the extinction ratio increased in multiples and the full width at half maximum greatly compressed can be output by the lower right corner grating coupler.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 8.
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