CN114609726B - Ultra-narrow band filtering method based on harmonic chip integrated cascade filter - Google Patents
Ultra-narrow band filtering method based on harmonic chip integrated cascade filter Download PDFInfo
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- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
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- G02B6/29331—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 operating by evanescent wave coupling
- G02B6/29335—Evanescent coupling to a resonator cavity, i.e. between a waveguide mode and a resonant mode of the cavity
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- G02B6/293—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
- 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
- G02B6/29395—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 configurable, e.g. tunable or reconfigurable
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Abstract
The application discloses an ultra-narrow band filtering method based on an integrated cascading filter on a harmonic chip, which is characterized in that a plurality of filters with the same structure are prepared and cascaded on the same chip, and the center wavelengths of the filters are controlled by a chip integrated circuit to be strictly overlapped, so that ultra-narrow band filtering is realized. The application can improve the performance of the chip integrated filter through the system optimization design based on the prior art, effectively solves the problems of high half-height full-width, small extinction ratio and the like of the chip integrated filter, greatly improves the frequency domain processing capability of the chip integrated optical path, and lays a solid foundation for research, development, application and performance upgrading of the chip integrated photoelectric information system.
Description
Technical Field
The application belongs to the field of interdisciplines 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 which have the same structure, can be independently regulated and controlled and have coincident central wavelengths, and particularly relates to an ultra-narrow band filtering method, an ultra-narrow band filtering system and a storage medium based on an integrated cascading filter of a harmonic chip.
Background
The photoelectric information system is a complex system which consists of photoelectric devices and realizes information functions through optical effects, and comprises an optical communication system, an optical switching system, an all-optical signal processing system, a microwave photon system 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 controlled by a discrete photoelectric device or an all-fiber photoelectric device, when the system is large in scale, the problems of large volume, high power consumption, poor stability, high failure rate, difficult coordination, slow upgrading and the like are faced, and more importantly, the standardized, large-scale and product application process of the photoelectric information system is seriously delayed by the loose coupling integration mode of each photoelectric device. Therefore, the chip integrated photoelectric information system has been widely focused in recent years, and on one hand, benefits from the advantages of small volume, low power consumption, powerful functions, stable performance, batch preparation, board card integration and the like, and on the other hand, the chip integrated optical circuit is highly compatible with the traditional chip integrated circuit preparation process, so that the photoelectric hybrid integrated chip becomes a preferred technical scheme for large-scale application more and more due to the characteristic.
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 source and the like. However, compared with the free space filter, the chip integrated filter generally faces short plates with larger full width at half maximum, smaller extinction ratio, poorer tunability and the like, and the chip integrated microcavity is difficult to reach parameter precision compared with the free space optical film by virtue of the source.
Disclosure of Invention
Based on the problems of the prior art, the application aims to solve the technical problems of how to prepare and integrate a plurality of discrete filters with the same structure on a single chip, and realize the chip integrated filtering function of greatly compressing the full width at half maximum and increasing the extinction ratio by times by using the bias voltage loaded by a control electrode to independently control the center wavelength of each filter to be strictly coincident (meet the harmonic condition) through the cascade connection of transmission waveguides.
In order to achieve the above effects, the ultra-narrow band filtering method based on the on-resonance chip integrated cascade filter provided by the application comprises the following steps:
step one, 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 center wavelength of each filter through externally connecting bias voltage, and cascading each filter by using a chip integrated waveguide;
and secondly, 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 increased in a multiplied way.
Preferably, the method specifically comprises the following steps:
s101, preparing a grating coupler to guide a signal light field into or out of a chip;
s102, preparing control electrodes of each filter, and connecting the control electrodes with pin electrodes by using integrated wires;
s103, loading control voltage to each filter through the pin electrode to obtain the ultra-narrow band filtering effect.
Preferably, the step S101 prepares filters with the same structure through a standard process of chip integrated optical circuits, and realizes filter cascading through a transmission waveguide, and prepares a grating coupler to guide a signal optical field into or out of a chip.
Preferably, the step S102 prepares each filter control electrode according to a standard of a chip integrated circuit, and connects the control electrode with the lead electrode by using an integrated wire.
Preferably, the step S103 is to apply a control voltage to each filter through the pin electrode, and to obtain an ultra-narrow band filtering effect by adjusting the center wavelength of each filter so as to increase the extinction ratio by a multiple and compress the full width at half maximum.
Preferably, a plurality of filters with the same structure are prepared and cascaded on the same chip, the center wavelength of each filter is controlled through a chip integrated circuit, and ultra-narrow band filtering with high extinction ratio is realized.
Preferably, the integrated optical circuit is prepared by a standard chip integrated optical circuit process, has a certain degree of freedom of structural design, efficiently transmits an optical field without damage, has a certain band-pass or band-stop capacity in a frequency domain, and realizes transmission spectrum tuning by changing the refractive index of a waveguide.
Preferably, the filter is prepared by a standard process of a chip integrated circuit, has a certain degree of freedom of structural design, changes the refractive index of a 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 lead and a pin electrode to receive bias voltages with different intensities.
A system for implementing the above ultra-narrow band filtering method based on-chip cascading filters, comprising:
the preparation, cascading and independent control subsystem of the filters 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 through externally connecting bias voltage, and cascading each filter by using a chip integrated waveguide;
the ultra-narrow band filtering implementation subsystem is used for precisely regulating and controlling the central wavelength of each filter by controlling the bias voltage, greatly compressing the full width at half maximum and increasing the extinction ratio in a doubling way;
the system prepares filters with the same structure through a chip integrated optical path standard process, realizes filter cascading through a transmission waveguide, and prepares a grating coupler to guide a signal light field into or out of a chip; preparing control electrodes of each filter by using a chip integrated circuit standard, and connecting the control electrodes with the pin electrodes by using an integrated lead; loading control voltage to each filter through a pin electrode, and obtaining ultra-narrow band filtering effect of multiplied extinction ratio and full width half maximum compression 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 with equal probability; the same carrier straight waveguide output spectrum presents the characteristic of band-stop filtering, and different carrier straight waveguide output spectrums present the characteristic of band-pass filtering; the signal light field passes through four band-pass filters according to the sequence of the first micro-ring, the same carrier straight waveguide, the second micro-ring, different carrier straight waveguides, the third micro-ring, different carrier straight waveguides, the fourth micro-ring and different carrier straight waveguides; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelength of each micro-ring filter is consistent, and the grating coupler outputs an ultra-narrow band-pass filter spectrum with the extinction ratio multiplied by half-height and full-width compressed by a large margin; 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, the signal light field passes through four band-stop filters, and the bias voltage loaded on the control electrode is regulated, so that the ultra-narrow band-stop filter spectrum with the extinction ratio multiplied and compressed in half-height full-width can be output at the right lower-angle grating coupler.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the above method.
Compared with the prior art, the application can realize the performance improvement of the chip integrated filter by the chip integrated optical path design based on the current state of the technology, 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 path, and lays a solid foundation for the research, development, application and performance upgrading of the chip integrated photoelectric information system.
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In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are needed to be used in the embodiments of the present application will be briefly described, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of the structure of the cascaded micro-ring based ultra-narrow band filter of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely configured to illustrate the application and are not configured to limit the application. It will be apparent to one skilled in the art that the present application 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 application by showing examples of the application.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 like elements in a process, method, article or apparatus that comprises the element.
The application provides an embodiment of an ultra-narrow band filtering method based on an integrated cascade filter on a harmonic chip, which comprises the following steps:
step one, 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 center wavelength of each filter through externally connecting bias voltage, and cascading each filter by using a chip integrated waveguide;
and secondly, 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 increased in a multiplied way.
In some embodiments, the method specifically comprises:
s101, preparing a grating coupler to guide a signal light field into or out of a chip;
s102, preparing control electrodes of each filter, and connecting the control electrodes with pin electrodes by using integrated wires;
s103, loading control voltage to each filter through the pin electrode to obtain the ultra-narrow band filtering effect.
In some embodiments, S101 prepares filters of the same structure by standard technology of chip integrated optical circuit, and realizes filter cascade by transmission waveguide, prepares grating coupler to guide signal optical field into or out of chip.
In some embodiments, S102 prepares each filter control electrode by a chip integrated circuit standard, and connects the control electrode to the pin electrode using an integrated wire.
In some embodiments, S103 loads a control voltage onto each filter through the pin electrode, and obtains an ultra-narrow band filtering effect of double increase of extinction ratio and full width at half maximum compression by adjusting the center wavelength of each filter.
In some embodiments, multiple filters of the same structure are prepared and cascaded on the same chip, and the center wavelength of each filter is controlled by a chip integrated circuit to realize ultra-narrow band filtering with high extinction ratio.
In some embodiments, the optical waveguide is prepared by a standard chip integrated optical path process, has a certain degree of freedom of structural design, efficiently transmits an optical field without damage, has a certain band-pass or band-stop capability in a frequency domain, and realizes transmission spectrum tuning by changing the refractive index of a waveguide.
In some embodiments, the filter is prepared by a standard process of a chip integrated circuit, has a certain degree of freedom of structural design, changes the refractive index of a 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 lead and a pin electrode to receive bias voltages with different intensities.
The application provides a system for realizing the ultra-narrow band filtering method based on the on-resonance chip integrated cascade filter, which comprises the following steps:
the preparation, cascading and independent control subsystem of the filters 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 through externally connecting bias voltage, and cascading each filter by using a chip integrated waveguide;
the ultra-narrow band filtering implementation subsystem is used for precisely regulating and controlling the central wavelength of each filter by controlling the bias voltage, greatly compressing the full width at half maximum and increasing the extinction ratio in a doubling way;
the system prepares filters with the same structure through a chip integrated optical path standard process, realizes filter cascading through a transmission waveguide, and prepares a grating coupler to guide a signal light field into or out of a chip; preparing control electrodes of each filter by using a chip integrated circuit standard, and connecting the control electrodes with the pin electrodes by using an integrated lead; loading control voltage to each filter through a pin electrode, and obtaining ultra-narrow band filtering effect of multiplied extinction ratio and full width half maximum compression 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 with equal probability; the same carrier straight waveguide output spectrum presents the characteristic of band-stop filtering, and different carrier straight waveguide output spectrums present the characteristic of band-pass filtering; the signal light field passes through four band-pass filters according to the sequence of the first micro-ring, the same carrier straight waveguide, the second micro-ring, different carrier straight waveguides, the third micro-ring, different carrier straight waveguides, the fourth micro-ring and different carrier straight waveguides; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelength of each micro-ring filter is consistent, at the moment, the right upper-angle grating coupler doubles and improves the output extinction ratio (the ratio of the maximum value to the minimum value of the transmittance) and greatly compresses the ultra-narrow band bandpass filter spectrum with the full width at half maximum (the bandwidth range corresponding to half the transmittance); 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, the signal light field passes through four band-stop filters, and the bias voltage loaded on the control electrode is regulated, so that the ultra-narrow band-stop filter spectrum with the extinction ratio multiplied and compressed in half-height full-width can be output at the right lower-angle grating coupler.
As shown in fig. 1, the present application provides an embodiment of an ultra-narrow band filter based on cascaded micro-rings, where the signal light field enters the carrier straight waveguide through the grating coupler in the lower left corner, enters the micro-ring 1 through evanescent coupling, and is output from the straight-through side (same carrier straight waveguide) and the download side (different carrier straight waveguides) with equal probability; the through-side output spectrum exhibits band-stop filtering characteristics, and the download-side output spectrum exhibits band-pass filtering characteristics. The signal light field passes through four band-pass filters according to the sequence of microring 1, downloading side, microring 2, downloading side, microring 3, downloading side, microring 4 and downloading side; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelength of each micro-ring filter is consistent, and at the moment, the right upper-angle grating coupler doubles and improves the output extinction ratio (the ratio of the maximum value to the minimum value of the transmittance) and greatly compresses the ultra-narrow band bandpass filter spectrum with the full width at half maximum (the bandwidth range corresponding to half the transmittance). Similarly, the signal light field passes through four band-stop filters according to the sequence of the microring 1, the through side, the microring 5, the through side, the microring 6, the through side, the microring 7 and the through side, and the bias voltage loaded on the control electrode is regulated, so that the ultra-narrow band-stop filter spectrum with the extinction ratio which is multiplied and compressed in half-height full-width can be output at the right lower-angle grating coupler.
The application provides an embodiment of an ultra-narrow band filtering method based on an integrated cascading filter on a harmonic chip, wherein 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 the ultra-narrow band filtering with high extinction ratio is realized. The application can realize the improvement of the performance of the chip integrated filter by the chip integrated optical path design based on the current state of the technology, 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 path, and lays a solid foundation for the research, the development, the application and the performance upgrading of the chip integrated photoelectric information system.
In some embodiments, the chip integrated filter can be prepared through a chip integrated optical path standard process, has a certain degree of freedom of structural design, can efficiently and nondestructively transmit an optical field, has a certain band-pass or band-stop capability in a frequency domain, can realize transmission spectrum tuning through changing a waveguide refractive index, and can realize transmission spectrum tuning by a tuning basic principle including but not limited to a thermo-optical effect, an electro-optical effect, a photoelectric effect and the like, a typical structure includes but not limited to a micro-ring cavity, a whispering gallery micro-disc cavity, a photonic crystal slow-light micro-cavity and the like, and the cascaded filter can have the same structure or different structures, and a material platform includes but not limited to silicon on an insulator, hydrogen-carrying amorphous silicon, silicon nitride, silicon carbide, chalcogenide glass, III-V aluminum gallium arsenide, III-V indium phosphide and the like, so on, and can adopt a single material integration method or a multi-material mixed integration method.
In some embodiments, the chip integrated circuit can be prepared by a standard process of the chip integrated circuit, has a certain degree of freedom of structural design, 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 dimensions and wiring parameters of the control electrode, the integrated wire and the pin electrode.
In some embodiments, ultra-narrow band filtering can realize functions of increasing extinction ratio, compressing full width at half maximum and the like by changing bias voltage distribution on a plurality of control electrodes, and the center wavelengths of the filters need to be completely overlapped, so that the optimal parameters of full width at half maximum, extinction ratio and filtering spectrum are not limited.
Compared with the prior art, the application has the following advantages:
firstly, the application solves the problems of larger full width at half maximum, smaller extinction ratio, smaller tuning freedom and the like commonly faced by the chip integrated filter, provides a feasible technical scheme for the chip integrated ultra-narrow band filter, and greatly improves the frequency domain precision of the chip integrated filter;
secondly, the ultra-narrow band filtering method expands the tuning freedom from the central wavelength to other parameters such as the filtering spectrum shape, 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 technology, achieves the improvement of the performance of the chip integrated filter through the design of the chip integrated optical path, has higher engineering practicability, and can lay a solid foundation for the research, development, application and performance upgrading of the chip integrated photoelectric information system.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
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 storage media for a computer 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, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (1)
1. A system for implementing an ultra-narrow band filtering method based on an on-chip integrated cascaded filter, comprising:
the preparation, cascading and independent control subsystem of the filters 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 through externally connecting bias voltage, and cascading each filter by using a chip integrated waveguide;
the ultra-narrow band filtering implementation subsystem is used for precisely regulating and controlling the central wavelength of each filter by controlling the bias voltage, greatly compressing the full width at half maximum and increasing the extinction ratio in a doubling way;
the system prepares filters with the same structure through a chip integrated optical path standard process, realizes filter cascading through a transmission waveguide, and prepares a grating coupler to guide a signal light field into or out of a chip; preparing control electrodes of each filter by using a chip integrated circuit standard, and connecting the control electrodes with the pin electrodes by using an integrated lead; loading control voltage to each filter through a pin electrode, and obtaining ultra-narrow band filtering effect of multiplied extinction ratio and full width half maximum compression 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 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, 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 with equal probability; the same carrier straight waveguide output spectrum presents the characteristic of band-stop filtering, and different carrier straight waveguide output spectrums present the characteristic of band-pass filtering; the signal light field passes through four band-pass filters according to the sequence of the first micro-ring, the first different carrier straight waveguide, the second micro-ring, the second different carrier straight waveguide, the third micro-ring, the third different carrier straight waveguide, the fourth micro-ring and the fourth different carrier straight waveguide; the refractive index of each micro-ring can be adjusted by adjusting the bias voltage loaded on the control electrode, so that the response wavelength of each micro-ring filter is consistent, and the grating coupler outputs an ultra-narrow band-pass filter spectrum with the extinction ratio multiplied by half-height and full-width compressed by a large margin; 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, the signal light field passes through four band-stop filters, and the bias voltage loaded on the control electrode is regulated, so that an ultra-narrow band-stop filter spectrum with the extinction ratio multiplied by one-time and compressed in half-height full-width can be output at the right lower-angle grating coupler;
the ultra-narrow band filtering method based on the on-resonance chip integrated cascade filter comprises the following steps:
step one, 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 center wavelength of each filter through externally connecting bias voltage, and cascading each filter by using a chip integrated waveguide;
and secondly, 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 increased in a multiplied way.
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