CN114609727A - Chip integrated programmable filtering method based on 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 a chip integrated programmable filtering method, a system and a storage medium based on a cascade filter, wherein a plurality of filters are prepared and cascaded on a single chip, and the central wavelength and the spectral characteristic of each filter are controlled by a chip integrated circuit, so that the performance indexes of the cascade filter, such as the transmission spectrum shape, the full width at half maximum, the central wavelength, the extinction ratio and the like, have programmable adjustment capability. The invention solves the problem that the traditional filter can only tune the short board of the central wavelength, establishes the compiling corresponding relation between digital logic and filtering spectrum, can improve the flexible adjustability of the photoelectric information system in the aspect of frequency domain processing, and can provide important reference for the research and development of a software-defined 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 chip integrated filtering method for realizing programmable transmission spectrum by cascading a plurality of filters and independently tuning the central wavelength of each filter, and particularly relates to a chip integrated programmable filtering method, a system and a storage medium based on the cascaded filters.
Background
The photoelectric information system refers to a complex system for executing information processing functions through photoelectric devices, and comprises an optical communication system, an optical switching system, an all-optical signal processing system, an optical computer and a microwave photonic system. The traditional photoelectric information system is mainly realized through a free space optical path or an all-fiber optical path, an optical field carrying information is transmitted in the free space or an optical fiber, and a photoelectric device is controlled through an external circuit to realize optical field regulation and control. However, the free space optical path and the all-fiber optical path have problems of large system size, poor stability, difficult coordination control, slow upgrading and updating rate, and the like, and are difficult to be applied in a large scale in an outdoor environment. More importantly, the design difficulty of the control circuit of the traditional photoelectric information system is seriously increased by the loosely coupled integration mode of all photoelectric devices. On the other hand, due to the rapid development of the manufacturing process of the chip integrated photoelectric device, the chip integrated photoelectric device including the optical modulator, the optical filter, the directional coupler and the wavelength division multiplexer has performance indexes not inferior to those of the traditional discrete photoelectric device. The single-chip photoelectric information system has the advantages of small volume, low power consumption, strong stability, batch preparation and the like. Particularly, the chip integrated optical circuit is highly compatible with the chip integrated circuit preparation process, so that the single chip integrated photoelectric information system becomes possible, and the programmable design capability of the photoelectric information system is given through the chip integrated logic circuit.
Optical filters are widely used in optoelectronic information systems, and typical applications include wavelength division multiplexing optical communication, optical fourier transform, microwave photonic signal shaping, and the like. The main performance indexes of the optical filter include center wavelength, full width at half maximum, extinction ratio, transmission spectrum shape and the like, and the adjustability of each parameter directly influences the flexible control capability of typical application.
Disclosure of Invention
Based on the problems of the prior art, the invention provides a chip integrated programmable filtering method based on a cascade filter, and the technical problem to be solved by the invention is how to integrate a plurality of discrete filters on a single chip, wherein the structures of the filters can be the same or different, the filters can independently tune the central wavelength by controlling the voltage, the filters are cascaded in sequence by using a chip integrated waveguide, and the specific filtering function of programmable design is realized by changing the distribution of control voltage.
In order to achieve the above effect, the chip integrated programmable filtering method based on the cascade filter provided by the invention comprises the following steps:
step one, preparation, cascade connection and independent control of filters, namely, a plurality of discrete filters are prepared and 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 in sequence by utilizing a chip integrated waveguide;
and step two, realizing the programmable filtering function, namely loading digital logic control voltage distribution on each photoelectric device to realize the flexible controllable filtering function with adjustable central wavelength, controllable full width at half maximum, selectable spectrum shape and multiplicable extinction ratio.
Preferably, the method specifically comprises:
s101, preparing a discrete filter waveguide structure,
s102, preparing a grating coupler to lead a signal light field into or out of a chip;
s102, preparing control electrodes of each filter;
and S103, realizing programmable control of each parameter.
Preferably, in step S101, the discrete filter waveguide structure is prepared by a standard chip integrated optical circuit preparation process, and the filters are connected by a path selection optical circuit and a transmission waveguide.
Preferably, in step S103, the control electrodes of the filters are prepared by a standard process of a chip integrated circuit, and the control electrodes are connected to the pin electrodes by using an integrated wire.
Preferably, in step S104, the digital logic control voltage is applied to each of the optoelectronic devices through the pin electrode, and the reference port is used to output the spectrum to modify the output port of the filtering port, so as to implement programmable control of each parameter.
Preferably, the parameters include, but are not limited to, center wavelength, full width at half maximum, spectral shape, extinction ratio.
Preferably, the optical filter is prepared by a chip integrated optical circuit standard process, has a certain structural design freedom, efficiently and losslessly transmits an optical field, has a certain band-pass or band-stop capability in a frequency domain, realizes transmission spectrum tuning by changing the refractive index of a waveguide, changes the refractive index of a transmission waveguide in a filter structure to realize filter center wavelength tuning, and is connected to an external logic circuit by a control electrode-integrated wire-pin electrode.
Preferably, the output filter parameters are flexibly changed by changing the bias voltage distribution on the plurality of control electrodes, and the conversion from the mathematical logic to the filter parameters is realized according to the sequence of logic definition, bias voltage distribution, the central wavelength of the discrete filter and normalized filter spectrum.
A system for realizing the chip integrated programmable filtering method based on the cascade filter comprises a grating coupler, a filtering system, an optical beam splitter, a transmission waveguide, a plurality of electrodes, a micro-ring cavity discrete filter and an arrayed waveguide grating discrete filter,
the signal light field is input into the filtering system through the grating coupler, is transmitted along different transmission paths after passing through a path selection light path consisting of an optical beam splitter, a transmission waveguide and electrodes, passes through two types of discrete filters, namely a micro-ring cavity and an array waveguide grating, and is finally output by different grating couplers;
preparing and integrating a plurality of discrete filters on a single chip, realizing independent tuning of the central wavelength of each filter by external bias voltage, and cascading each filter in sequence by using a chip integrated waveguide;
the digital logic control voltage distribution is loaded on each photoelectric device, so that the flexible controllable filtering function of adjustable central wavelength, controllable full width at half maximum, selectable spectrum shape and multiplicable extinction ratio is realized;
preparing a discrete filter waveguide structure by a chip integrated optical circuit standard preparation process, wherein the filters are connected by a path selection optical circuit and a transmission waveguide, and a grating coupler is prepared to lead a signal optical field into or out of a chip;
preparing control electrodes of each filter by a standard process of a chip integrated circuit, and connecting the control electrodes with the pin electrodes by using integrated wires;
and loading digital logic control voltage to each photoelectric device through a pin electrode, and correcting an output port of a filtering port by using a reference port output spectrum to realize programmable control of each parameter.
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 extends the degree of freedom of the filter from the traditional central wavelength to the full width at half maximum, the extinction ratio and the spectrum shape, effectively improves the frequency domain processing capability of the optical signal, and provides a brand new thought for a software-defined photoelectric information system controlled by a chip integrated logic circuit.
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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 may be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic diagram of a cascaded filter based on-chip integrated programmable filtering system 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 a chip integrated programmable filtering method based on a cascade filter, which comprises the following steps:
step one, preparation, cascade connection and independent control of filters, namely, a plurality of discrete filters are prepared and 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 in sequence by utilizing a chip integrated waveguide;
and step two, realizing the programmable filtering function, namely loading digital logic control voltage distribution on each photoelectric device to realize the flexible controllable filtering function with adjustable central wavelength, controllable full width at half maximum, selectable spectrum shape and multiplicable extinction ratio.
In some embodiments, the method specifically comprises:
s101, preparing a discrete filter waveguide structure,
s102, preparing a grating coupler to lead a signal light field into or out of a chip;
s103, preparing control electrodes of each filter;
and S104, realizing programmable control of each parameter.
In some embodiments, step S101 is to prepare a discrete filter waveguide structure through a standard fabrication process of a chip integrated optical circuit, and the filters are connected by a path selection optical circuit and a transmission waveguide.
In some embodiments, step S103 is to prepare each filter control electrode by a standard process of a chip integrated circuit, and connect the control electrode with the pin electrode by using an integrated wire.
In some embodiments, step S104 loads the digital control voltage to each optoelectronic device through the pin electrode, and the reference port outputs the spectrum modification filter port output port, so as to realize programmable control of each parameter.
In some embodiments, the parameters include, but are not limited to, center wavelength, full width at half maximum, spectral shape, extinction ratio.
In some embodiments, the optical filter is manufactured by a standard chip integrated optical circuit process, has a certain structural design freedom, efficiently and losslessly transmits an optical field, has a certain band-pass or band-stop capability in a frequency domain, realizes transmission spectrum tuning by changing the refractive index of a waveguide, changes the refractive index of a transmission waveguide in a filter structure to realize central wavelength tuning of the filter, and is connected to an external logic circuit through a control electrode-integrated wire-pin electrode.
In some embodiments, the output filter parameters are flexibly changed by changing the bias voltage distribution on a plurality of control electrodes, and the conversion from the mathematical logic to the filter parameters is realized in the order of logic definition, bias voltage distribution, center wavelength of the discrete filter, and normalized filter spectrum.
The invention provides a system for realizing a chip integrated programmable filtering method based on a cascade filter, which comprises a grating coupler, a filtering system, an optical beam splitter, a transmission waveguide, a plurality of electrodes, a micro-ring cavity discrete filter and an array waveguide grating discrete filter,
the signal light field is input into the filtering system through the grating coupler, is transmitted along different transmission paths after passing through a path selection light path consisting of an optical beam splitter, a transmission waveguide and electrodes, passes through two types of discrete filters, namely a micro-ring cavity and an array waveguide grating, and is finally output by different grating couplers;
preparing and integrating a plurality of discrete filters on a single chip, realizing independent tuning of the central wavelength of each filter by external bias voltage, and cascading each filter in sequence by using a chip integrated waveguide;
the digital logic control voltage distribution is loaded on each photoelectric device, so that the flexible controllable filtering function of adjustable central wavelength, controllable full width at half maximum, selectable spectrum shape and multiplicable extinction ratio is realized;
preparing a discrete filter waveguide structure by a chip integrated optical circuit standard preparation process, wherein the filters are connected by a path selection optical circuit and a transmission waveguide, and a grating coupler is prepared to lead a signal optical field into or out of a chip;
preparing control electrodes of each filter by a standard process of a chip integrated circuit, and connecting the control electrodes with the pin electrodes by using integrated wires;
and loading digital logic control voltage to each photoelectric device through a pin electrode, and correcting an output port of a filtering port by using a reference port output spectrum to realize programmable control of each parameter.
An embodiment of a chip-integrated programmable filtering system fabricated by a silicon-on-insulator process is shown in fig. 1 to describe a cascaded interferometer based chip-integrated programmable filtering method. The signal light field is input into the filtering system through the grating coupler, transmitted along different transmission paths after passing through a path selection light path (essentially a Mach-Zehnder interferometer) consisting of an optical beam splitter, a transmission waveguide and electrodes, passes through two types of discrete filters, namely a micro-ring cavity and an array waveguide grating, and is finally output by different grating couplers.
The voltage distribution of the electrodes 1, 2, 3 determines the transmission path of the signal light field: when the electrode 1 takes a logic value 0 (namely no bias voltage is added), a signal light field can be output from the grating coupler (firstly, the electrode 2 takes a logic value 0) or (secondly, the electrode 2 takes a logic value 1); when the electrode 1 removes the logic value 1 (namely, the bias voltage is loaded), the signal optical field can be output from the grating coupler (the electrode 3 takes the logic value 0) or (the electrode 3 takes the logic value 1). The correspondence between the logical values of the electrodes 1, 2 and 3 and the type of the cascade filter is shown in table 1, and a normalized filtering spectrum (capable of describing each filtering parameter) can be obtained by comparing the output spectra of the filtering ports (from the second to the third) with the output spectrum of the reference (the first).
The electrodes 4-9 can control the center wavelength of the discrete filter and change the normalized filtering spectrum. Specifically, when the electrode 4 and the electrode 5 both take a logic value of 0, the center wavelength of the transmission spectrum (ideally, the rectangular band-pass spectrum) of the cascaded array waveguide grating is kept unchanged, the full width at half maximum is kept unchanged, and the extinction ratio is doubled; when the electrode 4 and the electrode 5 respectively take logic values of 1 and 0, the original full width at half maximum and the original full width at half maximum of the cascade array waveguide grating transmission spectrum center wavelength red-shifted by one quarter are reduced to half, and the extinction ratio is doubled; when the electrode 4 and the electrode 5 both take a logic value 1, the cascaded arrayed waveguide grating transmits full width at half maximum of one-half red shift of the center wavelength of the spectrum, the full width at half maximum is kept unchanged, and the extinction ratio is doubled. Similarly, the normalized filtering spectrum of the cascade micro-ring cavity can be adjusted by logically taking values through the electrodes 6 and 7, and the normalized filtering spectrum of the micro-ring cavity and the array waveguide grating can be adjusted by logically taking values through the electrodes 8 and 9.
TABLE 1 correspondence of electrode logic values to discrete filter types
| | Electrode | 1 | Electrode | 2 | Electrode | 3 logic value | Cascaded |
| ① | 0 | 0 | - | Reference port (without filter) | |||
| ② | 0 | 1 | - | Cascaded array waveguide grating | |||
| ③ | 1 | - | 0 | Cascaded |
|||
| ④ | 1 | - | 1 | Micro-ring cavity + array waveguide grating |
The flexible adjustment of performance indexes such as transmission spectrum shape, full width at half maximum, central wavelength, extinction ratio and the like can be realized by controlling the electrodes; the input item is compiling logic, the output item is normalized filtering spectrum, and the process embodies the programmable characteristic of the chip integrated filtering system. Particularly, when the electrodes 4 to 9 are sampled in a discrete manner, i.e., the bias voltage can be freely adjusted within a certain range, the filter system shown in fig. 1 has a stronger programmability, i.e., a more flexible adjustment degree of freedom.
The invention provides an embodiment of a chip integrated programmable filtering method based on a cascade filter, which comprises the following steps:
s201, preparing a waveguide structure of a discrete filter through a standard preparation process of a chip integrated optical circuit, wherein filters are connected through a path selection optical circuit and a transmission waveguide, and a grating coupler is prepared to lead a signal optical field into or out of a chip;
s202, preparing control electrodes of each filter through a standard process of a chip integrated circuit, and connecting the control electrodes with pin electrodes by using integrated wires;
and S203, loading the digital logic control voltage on each photoelectric device through the pin electrode, and correcting the output port of the filtering port by using the output spectrum of the reference port to realize programmable control of parameters such as central wavelength, full width at half maximum, spectrum shape, extinction ratio and the like.
The invention provides an embodiment of a chip integrated programmable filtering method based on a cascade filter, which is characterized in that a plurality of filters are prepared and cascaded on a single chip, and each filter is controlled by a chip integrated logic circuit to enable filtering parameters such as a transmission spectrum shape, a full width at half maximum, a center wavelength, an extinction ratio and the like to have programmable control attributes. The invention expands the tuning freedom degree of the traditional filter, effectively improves the frequency domain signal processing capability of the chip integrated photoelectric information system, and provides important reference for the software defined photoelectric information system.
The invention provides an embodiment of a chip integrated programmable filtering method based on a cascade filter, which is characterized in that a plurality of filters are prepared and cascaded on a single chip, and each filter is controlled by a chip integrated logic circuit to enable filtering parameters such as a transmission spectrum shape, a full width at half maximum, a center wavelength, an extinction ratio and the like to have programmable control attributes.
In some embodiments, the chip integrated filter can be manufactured by a standard process of a chip integrated optical circuit, has a certain degree of 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 the refractive index of a waveguide, and can tune fundamental principles including but not limited to thermo-optical effect, electro-optical effect, photoelectric effect and the like, the structures include but not limited to arrayed waveguide grating, mach-zenith interferometer, micro-ring cavity, echo wall micro-disc cavity, photonic crystal slow-light micro-cavity, fabry-perot cavity, bragg grating and the like, the cascaded filters can have the same structure or different structures, the used material platforms include but not limited to silicon on insulator, hydrogen-loaded amorphous silicon, silicon nitride, silicon carbide, chalcogenide glass, iii-v-group aluminum gallium arsenic, iii-v-group indium phosphide and the like, and can adopt a single material integration method, a multi-material mixing integration method can also be adopted;
in some embodiments, the chip integrated logic 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, does not limit the structural size and wiring parameters of the control electrode, the integrated wire and the pin electrode, and does not limit the interface definition principle and the logic compiling mode.
In some embodiments, the programmable filtering can flexibly change the filter parameters such as output transmission spectrum shape, full width at half maximum, center wavelength, extinction ratio and the like by changing the bias voltage distribution on a plurality of control electrodes, and can realize the conversion from mathematical logic (input quantity) to filter parameters (output quantity) according to the sequence of logic definition → bias voltage distribution → discrete filter center wavelength → normalized filtering spectrum; the programmable input quantity can be binary logic, discrete logic or continuous variable, does not limit programming language, interface definition and compiling rules, does not limit the type, characteristics and quantity of normalized filtering spectrums in the output quantity set, and does not limit the specific structure and implementation mode of the programmable filtering system.
Compared with the prior art, the invention has the following advantages:
firstly, the traditional discrete filter only has one tuning freedom degree of central wavelength, and is difficult to meet the use requirement of complex frequency domain signal processing of a photoelectric information system;
secondly, the invention provides a logic programmable filtering concept, and provides an optimal technical route of a photoelectric hybrid integrated chip, so that a compiling corresponding relation is established between digital logic and a filtering spectrum, and a solid foundation is laid for precise, standardized and diversified frequency domain information processing;
in addition, the invention provides a brand new thought for the design of high-efficiency photoelectric devices and large-scale photoelectric information systems, and related ideas can provide important references for the research and development of software-defined photoelectric information systems.
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 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 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 Disks (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. 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. A chip integrated programmable filtering method based on a cascade filter comprises the following steps:
step one, preparation, cascade connection and independent control of filters, namely, a plurality of discrete filters are prepared and 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 in sequence by utilizing a chip integrated waveguide;
and step two, realizing the programmable filtering function, namely loading digital logic control voltage distribution on each photoelectric device to realize the flexible controllable filtering function with adjustable central wavelength, controllable full width at half maximum, selectable spectrum shape and multiplicable extinction ratio.
2. The cascaded-filter-based chip integrated programmable filtering method according to claim 1, wherein the method specifically comprises:
s101, preparing a discrete filter waveguide structure,
s102, preparing a grating coupler to lead a signal light field into or out of a chip;
s103, preparing control electrodes of each filter;
and S104, realizing programmable control of each parameter.
3. The cascaded-filter-based chip-integrated programmable filtering method according to claim 2, wherein in step S101, the discrete filter waveguide structure is prepared by a standard chip integrated optical circuit preparation process, and the filters are connected by a routing optical circuit and a transmission waveguide.
4. The cascaded-filter-based chip integrated programmable filtering method according to claim 2, wherein in step S103, the control electrodes of each filter are prepared by standard chip integrated circuit processes, and the control electrodes are connected to the pin electrodes by integrated wires.
5. The cascaded-filter-based chip integrated programmable filtering method according to claim 2, wherein the step S104 loads the digital control voltage to each optoelectronic device through a pin electrode, and uses the reference port output spectrum to modify the output port of the filtering port, thereby implementing programmable control of each parameter.
6. The cascaded-filter-based, on-chip-integrated, programmable filtering method according to claim 2 or 5, characterized in that the parameters include, but are not limited to, center wavelength, full width at half maximum, spectral shape, extinction ratio.
7. The programmable filtering method of chip integration based on cascaded filters of claim 1 or 2, wherein the tunable filter is prepared by standard chip integrated optical circuit process, has a certain degree of freedom of structural design, efficiently transmits optical field without loss, has a certain band-pass or band-stop capability in frequency domain, realizes transmission spectrum tuning by changing the refractive index of waveguide, realizes tuning of central wavelength of the filter by changing the refractive index of transmission waveguide in the filter structure, and is connected to an external logic circuit by controlling electrode-integrated wire-pin electrode.
8. The cascaded-filter-based on-chip-integrated programmable filtering method according to claim 1 or 2, wherein the output filtering parameters are flexibly changed by changing the bias voltage distribution on the plurality of control electrodes, and the conversion from the mathematical logic to the filtering parameters is realized in the order of logic definition, bias voltage distribution, center wavelength of the discrete filter, and normalized filtering spectrum.
9. A system for implementing the cascaded-filter based chip-integrated programmable filtering method of claims 1-8, comprising a grating coupler, a filtering system, an optical splitter, a transmission waveguide, a plurality of electrodes, a micro-ring cavity discrete filter, and an arrayed waveguide grating discrete filter,
the signal light field is input into the filtering system through the grating coupler, is transmitted along different transmission paths after passing through a path selection light path consisting of an optical beam splitter, a transmission waveguide and electrodes, passes through two types of discrete filters, namely a micro-ring cavity and an array waveguide grating, and is finally output by different grating couplers;
preparing and integrating a plurality of discrete filters on a single chip, realizing independent tuning of the central wavelength of each filter by external bias voltage, and cascading each filter in sequence by using a chip integrated waveguide;
the digital logic control voltage distribution is loaded on each photoelectric device, so that the flexible controllable filtering function of adjustable central wavelength, controllable full width at half maximum, selectable spectrum shape and multiplicable extinction ratio is realized;
preparing a discrete filter waveguide structure by a chip integrated optical circuit standard preparation process, wherein the filters are connected by a path selection optical circuit and a transmission waveguide, and a grating coupler is prepared to lead a signal optical field into or out of a chip;
preparing control electrodes of each filter by a standard process of a chip integrated circuit, and connecting the control electrodes with the pin electrodes by using integrated wires;
and loading digital logic control voltage to each photoelectric device through a pin electrode, and correcting an output port of a filtering port by using a reference port output spectrum to realize programmable control of each parameter.
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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