CN114614938B - Wavelength division multiplexing channel switching method of vernier caliper - Google Patents
Wavelength division multiplexing channel switching method of vernier caliper Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- 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
- 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
- G02B6/29331—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
- G02B6/29338—Loop resonators
- G02B6/29343—Cascade of loop resonators
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
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Abstract
The invention discloses a wavelength division multiplexing channel switching method of a vernier caliper, which is to cascade two multi-wavelength band-pass filters with slightly different free spectrum ranges; according to the working principle of the vernier caliper, the band-pass spectrums of the two filters are overlapped at a specific wavelength channel through tiny tuning; and the fast switching of the wide-range wavelength division multiplexing channel is realized by utilizing the tuning of the small-range wavelength. The invention can improve the performance of the chip integrated filter through the system optimization design based on the prior art, effectively solves the bottleneck problem that the chip integrated filter has small tuning range and cannot adapt to the fast switching requirement of the wavelength division multiplexing channel, and provides a brand new technical reference for the performance upgrading and large-scale application of the photoelectric chip for optical communication.
Description
Technical Field
The invention belongs to the field of interdisciplines of integrated optics, optical communication and microwave photonics, and particularly relates to a method for realizing large-range wavelength division multiplexing channel switching by utilizing small-range wavelength tuning according to the working principle of a vernier caliper through a band-pass filter with small difference in cascade free spectrum range, in particular to a method, a system and a storage medium for switching wavelength division multiplexing channels of a vernier caliper.
Background
The photoelectric information system mainly realizes various complex information functions through optical effects, and the most widely applied optical communication system at present is mainly based on a free space optical path or an all-fiber optical path, so that the photoelectric information system has the problems of large volume, high power consumption, poor stability, high failure rate, difficult coordination, slow upgrading and the like. More importantly, as the index of the optical communication rate increases, means such as wavelength division multiplexing, partial division multiplexing, time division multiplexing, mode division multiplexing and the like are becoming popular, and the existing loose coupling integration mode of the free space optical path and the all-fiber optical path severely lags the scale practical upgrading process of the optical communication system. On the other hand, chip-integrated all-optical communication systems have been rapidly developed in recent years. The integrated circuit has the advantages of small volume, low power consumption, rich functions, stable performance, board card integration, batch preparation and the like, is highly compatible with the traditional integrated circuit process of the chip, can mix integrated functional light paths and logic circuits on a single chip, and is expected to become a preferred technical scheme of an all-optical communication system in the future.
The wavelength division multiplexing technology is widely applied in the fields of optical fiber communication, quantum communication, microwave photon signal processing and the like; wavelength division multiplexing system performance is highly dependent on multi-wavelength band pass filter performance. In particular, a multi-wavelength band-pass filter needs to have a free spectral range consistent with the International Telecommunications Union (ITU) frequency interval standard, and further needs to have a high extinction ratio, a large tuning bandwidth, and the like. However, the existing chip integrated filter mainly realizes tuning through thermo-optical effect, has limited tuning range, and is difficult to adapt to the practical requirement of flexibly switching a plurality of wavelength division multiplexing channels.
Disclosure of Invention
Based on the problems of the prior art, the invention aims to solve the technical problems of how to prepare and integrate two multi-wavelength filters with similar structures and slightly different free spectrum ranges on a single chip, and independently control the center wavelength of the filters by using bias voltage loaded by a control electrode through transmission waveguide cascading, so that the band-pass spectrums of the two filters are overlapped at a specific wavelength division multiplexing channel, and realize the rapid switching of a large-range wavelength division multiplexing channel by using small-range wavelength tuning.
In order to achieve the above effects, the wavelength division multiplexing channel switching method of the vernier caliper provided by the invention is characterized in that two multi-wavelength filters which are similar in structure and have differences in free spectrum ranges are prepared and integrated on a single chip, independent tuning of the center wavelength of the filters is realized through externally connected bias voltage, and the cascade connection of the filters is realized through chip integrated waveguides; the center wavelength of the filter is accurately regulated and controlled by controlling the bias voltage, so that the band-pass spectrum is overlapped on a specific wavelength division multiplexing channel, and the rapid switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength;
The chip integrated multi-wavelength band-pass filters with slightly different free spectrum ranges are cascaded, the center wavelengths of the band-pass spectrums of the two filters are overlapped with specific wavelengths through the control of the chip integrated circuit, and the small-range wavelength tuning is utilized to realize the rapid switching of a large-range wavelength division multiplexing channel.
Preferably, the method specifically comprises the following steps:
S101, preparing two sets of filters with similar structures and slightly different free spectrum ranges through a chip integrated optical path standard process, realizing filter cascading through a transmission waveguide, and preparing a grating coupler to guide a signal light field into or out of a chip;
s102, preparing a filter control electrode through a standard process of a chip integrated circuit, and connecting the control electrode with a pin electrode by utilizing an integrated wire;
S103, loading bias voltage to the filter through the pin electrode, and realizing specific wavelength division multiplexing channel output and switching by tuning the center wavelength of the band-pass spectrum of the filter.
Preferably, the method specifically comprises the following steps:
Step 1, a signal light field enters a carrier straight waveguide through a grating coupler, enters a micro-ring 1 through evanescent wave coupling, is output to the carrier straight waveguide from a downloading side, enters a micro-ring 2 through evanescent wave coupling, is output to the carrier straight waveguide from the downloading side and is output from an upper right corner grating coupler;
Step 2, the band-pass peak of the micro-ring 1 can be overlapped with the wavelength division multiplexing channels Ch1 to Ch4 by controlling the bias voltage loaded on the micro-ring 1;
And 3, according to the working principle of the vernier caliper, enabling one bandpass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch1 by controlling the bias voltage loaded on the micro-ring 2, enabling the bandpass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch2 by increasing the bias voltage loaded on the micro-ring 2, and enabling the wavelength division multiplexing channel to be Ch2.
Preferably, when one bandpass peak of the micro-ring 2 coincides with the wavelength division multiplexing channel Ch3, the wavelength division multiplexing channel is Ch3.
Preferably, the radius of the micro-ring 1 is slightly smaller than that of the micro-ring 2, so that the free spectral range of the band-pass filtering of the micro-ring 1 is slightly larger than that of the micro-ring 2.
Preferably, the method is prepared by 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 capacity in a frequency domain, and can realize transmission spectrum tuning by changing the refractive index of a waveguide, and the basic principle of tuning comprises but is not limited to a thermo-optical effect, an electro-optical effect and a photoelectric effect.
Preferably, the method is prepared through 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 a filter structure to realize the central wavelength tuning of the filter, is connected to an external logic circuit through a control electrode-integrated lead-pin electrode, receives bias voltages with different intensities, and does not limit the structural dimensions and wiring parameters of the control electrode, the integrated lead and the pin electrode.
Preferably, the free spectral ranges of the two multi-wavelength filters are M and N, M > N, and M accords with the ITU frequency interval standard, and the band-pass spectrum of the first filter (M) is overlapped with the ITU wavelength channel through tuning; when the tuning value of the second filter (N) is M-N, the adjacent wavelength channels with the span of M can be switched, and when the tuning value of the second filter is N times of M-N, the separated wavelength channels with the span of Mn can be switched; when the full width at half maximum of the band pass spectrums of the two filters is smaller than M/(M-N), only one wavelength channel is output in the bandwidth range corresponding to the least common multiple of M and N.
A system for realizing the wavelength division multiplexing channel switching method of the vernier caliper comprises the following steps:
The filter preparation, cascading and independent control device is used for preparing and integrating two multi-wavelength filters with similar structures and slightly different free spectrum ranges on a single chip, realizing independent tuning of the center wavelength of the filter through externally connecting bias voltage, and realizing filter cascading by using chip integrated waveguides;
the wavelength division multiplexing channel switching device is used for precisely regulating and controlling the center wavelength of the filter by controlling the bias voltage, so that the band-pass spectrum is overlapped on a specific wavelength division multiplexing channel, and the rapid switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength.
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 invention can realize the performance improvement of the chip integrated filter through the system design based on the prior art level, provides technical reference for a wideband tunable dense wavelength division multiplexing system, and provides important support for the standardized and large-scale application of the photoelectric chip for optical communication.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are needed to be used in the embodiments of the present invention 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 a switching principle of a wavelength division multiplexing channel based on a cascade micro-ring of the vernier caliper.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 invention and are not configured to limit 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 invention by showing examples of the invention.
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 invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier caliper, which comprises the steps of preparing and integrating two multi-wavelength filters with similar structures and different free spectrum ranges on a single chip, realizing independent tuning of the center wavelength of the filters through externally connecting bias voltage, and realizing filter cascading by using chip integrated waveguides; the center wavelength of the filter is accurately regulated and controlled by controlling the bias voltage, so that the band-pass spectrum is overlapped on a specific wavelength division multiplexing channel, and the rapid switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength;
The chip integrated multi-wavelength band-pass filters with slightly different free spectrum ranges are cascaded, the center wavelengths of the band-pass spectrums of the two filters are overlapped with specific wavelengths through the control of the chip integrated circuit, and the small-range wavelength tuning is utilized to realize the rapid switching of a large-range wavelength division multiplexing channel.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier caliper, which comprises the following steps:
S101, preparing two sets of filters with similar structures and slightly different free spectrum ranges through a chip integrated optical path standard process, realizing filter cascading through a transmission waveguide, and preparing a grating coupler to guide a signal light field into or out of a chip;
s102, preparing a filter control electrode through a standard process of a chip integrated circuit, and connecting the control electrode with a pin electrode by utilizing an integrated wire;
S103, loading bias voltage to the filter through the pin electrode, and realizing specific wavelength division multiplexing channel output and switching by tuning the center wavelength of the band-pass spectrum of the filter.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier caliper, which comprises the following steps:
Step 1, a signal light field enters a carrier straight waveguide through a grating coupler, enters a micro-ring 1 through evanescent wave coupling, is output to the carrier straight waveguide from a downloading side, enters a micro-ring 2 through evanescent wave coupling, is output to the carrier straight waveguide from the downloading side and is output from an upper right corner grating coupler;
Step 2, the band-pass peak of the micro-ring 1 can be overlapped with the wavelength division multiplexing channels Ch1 to Ch4 by controlling the bias voltage loaded on the micro-ring 1;
And 3, according to the working principle of the vernier caliper, enabling one bandpass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch1 by controlling the bias voltage loaded on the micro-ring 2, enabling the bandpass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch2 by increasing the bias voltage loaded on the micro-ring 2, and enabling the wavelength division multiplexing channel to be Ch2.
In some embodiments, when one bandpass peak of the microring 2 coincides with the wavelength division multiplexing channel Ch3, then the available wavelength division multiplexing channel is Ch3.
In some embodiments, microring 1 has a radius slightly smaller than microring 2, so microring 1 bandpass filters a free spectral range slightly larger than microring 2.
In some embodiments, the optical waveguide is prepared through a standard chip integrated optical path 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 capacity in a frequency domain, and can realize transmission spectrum tuning by changing the refractive index of a waveguide, and tuning basic principles comprise but are not limited to a thermo-optical effect, an electro-optical effect and a photoelectric effect.
In some embodiments, the filter is prepared through 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 central wavelength tuning of the filter, is connected to an external logic circuit through a control electrode-integrated lead-pin electrode, receives bias voltages with different intensities, and does not limit the structural dimensions and wiring parameters of the control electrode, the integrated lead and the pin electrode.
In some embodiments, the free spectral ranges of the two multi-wavelength filters are M and N, respectively, M > N and M meets ITU frequency spacing criteria, the first filter (M) band pass spectrum being coincident with the ITU wavelength channels by tuning; when the tuning value of the second filter (N) is M-N, the adjacent wavelength channels with the span of M can be switched, and when the tuning value of the second filter is N times of M-N, the separated wavelength channels with the span of Mn can be switched; when the full width at half maximum of the band pass spectrums of the two filters is smaller than M/(M-N), only one wavelength channel is output in the bandwidth range corresponding to the least common multiple of M and N.
The invention provides a system for realizing the wavelength division multiplexing channel switching method of the vernier caliper, which comprises the following steps:
The filter preparation, cascading and independent control device is used for preparing and integrating two multi-wavelength filters with similar structures and slightly different free spectrum ranges on a single chip, realizing independent tuning of the center wavelength of the filter through externally connecting bias voltage, and realizing filter cascading by using chip integrated waveguides;
the wavelength division multiplexing channel switching device is used for precisely regulating and controlling the center wavelength of the filter by controlling the bias voltage, so that the band-pass spectrum is overlapped on a specific wavelength division multiplexing channel, and the rapid switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength.
As shown in fig. 1, the present invention provides an embodiment of a wavelength division multiplexing channel switching method based on a cascaded micro-ring, wherein 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 wave coupling, is output from a downloading side to the carrier straight waveguide, enters a micro-ring 2 through evanescent wave coupling, is output from the downloading side to the carrier straight waveguide and is output from a grating coupler at the upper right corner; the radius of the micro-ring 1 is slightly smaller than that of the micro-ring 2, so that the free spectral range of band-pass filtering of the micro-ring 1 is slightly larger than that of the micro-ring 2; the band-pass peak of the micro-ring 1 can be overlapped with the wavelength division multiplexing channels Ch1 to Ch4 by controlling the bias voltage loaded on the micro-ring 1, and the bandwidth range is 3 times of the free spectrum range of the micro-ring 1 and 4 times of the free spectrum range of the micro-ring 2; according to the working principle of the vernier caliper, one bandpass peak of the micro-ring 2 can be overlapped with the wavelength division multiplexing channel Ch1 by controlling the bias voltage loaded on the micro-ring 2, then the available wavelength division multiplexing channels are Ch1 and Ch4, the bias voltage loaded on the micro-ring 2 is further increased to enable one bandpass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch2, then the available wavelength division multiplexing channel is Ch2, and similarly, when one bandpass peak of the micro-ring 2 is overlapped with the wavelength division multiplexing channel Ch3, the available wavelength division multiplexing channel is Ch3.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier caliper, which comprises the following steps:
S101, preparing two sets of filters with similar structures and slightly different free spectrum ranges through a chip integrated optical path standard process, realizing filter cascading through a transmission waveguide, and preparing a grating coupler to guide a signal light field into or out of a chip;
s102, preparing a filter control electrode through a standard process of a chip integrated circuit, and connecting the control electrode with a pin electrode by utilizing an integrated wire;
S103, loading bias voltage to the filter through the pin electrode, and realizing specific wavelength division multiplexing channel output and switching by tuning the center wavelength of the band-pass spectrum of the filter.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier caliper, which is characterized in that two chips with slightly different free spectrum ranges are cascaded to integrate multi-wavelength band-pass filters, the center wavelengths of the band-pass spectrums of the two filters are overlapped with specific wavelengths through the control of a chip integrated circuit, and the rapid switching of a large-range wavelength division multiplexing channel is realized by utilizing the tuning of a small-range wavelength.
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 comprises a thermal-optical effect, an electro-optical effect, a photoelectric effect and the like, typical structures comprise an array waveguide grating, a Mach-Zehnder interferometer, a micro-ring cavity, an echo wall micro-disc cavity, a photonic crystal slow light micro-cavity, a Fabry-Perot cavity, a Bragg grating and the like, cascaded filters can have the same structure or different structures, and material platforms comprise silicon on an insulator, hydrogen-loaded amorphous silicon, silicon nitride, silicon carbide, chalcogenide glass, III-V aluminum gallium arsenide, III-V indium phosphide and the like, and a single material integration method can be adopted, and a multi-material hybrid integration method can be adopted.
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, the wavelength channels are switched rapidly, the free spectral ranges of the two filters are M and N, M > N, respectively, and M meets ITU frequency spacing criteria, the band-pass spectrum of the first filter (M) is made to coincide with the ITU wavelength channels by tuning; when the tuning value of the second filter (N) is M-N, the adjacent wavelength channels with the span of M can be switched, and when the tuning value of the second filter is N times of M-N, the separated wavelength channels with the span of Mn can be switched; when the full width at half maximum of the band pass spectrums of the two filters is smaller than M/(M-N), only one wavelength channel is output in the bandwidth range corresponding to the least common multiple of M and N. Specific values of M, N are not limited, and specific parameters such as full width at half maximum, extinction ratio, filter spectral shape, etc. are not limited.
Compared with the prior art, the invention has the following advantages:
Firstly, the invention provides a wavelength division multiplexing channel switching method based on the existing chip integrated filter preparation technology level, which fully considers the limited technical state of the tuning range of chip integrated devices, and the small-range wavelength tuning realizes the rapid switching of a large-range wavelength division multiplexing channel. As can be seen by simple calculation, when the band-pass spectrum of the first filter (M) is overlapped with the ITU wavelength channel, the second filter (N) can realize the wavelength channel switching with the span of M by only tuning M-N, and when the full width at half maximum of the band-pass spectrum is smaller than M/(M-N), only one wavelength channel exists in the bandwidth range corresponding to the least common multiple of M and N.
And secondly, the wavelength division multiplexing channel switching method can greatly compress the full width at half maximum of the band-pass spectrum and multiply improve the light-directing wall while rapidly switching the wavelength division multiplexing channel, thereby being hopeful to improve the frequency domain resolution of the wavelength division multiplexing system.
In addition, the wavelength division multiplexing channel switching method is highly compatible with the existing preparation technology, the thought of realizing the improvement of the filter performance through the design of the chip integrated optical circuit has higher engineering practicability, and important references can be provided for the research and development application and the performance upgrading of various chip integrated photoelectric information systems.
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 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 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 (5)
1. A wavelength division multiplexing channel switching method of vernier caliper is characterized in that two multi-wavelength filters which are similar in structure and have differences in free spectral ranges are prepared and integrated on a single chip, independent tuning of the center wavelength of the filters is realized through externally connected bias voltage, and filter cascading is realized through chip integrated waveguides; the center wavelength of the filter is accurately regulated and controlled by controlling the bias voltage, so that the band-pass spectrum is overlapped on a specific wavelength division multiplexing channel, and the rapid switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength;
cascading two chip integrated multi-wavelength band-pass filters with slightly different free spectrum ranges, enabling the center wavelengths of the band-pass spectrums of the two filters to coincide with specific wavelengths through control of a chip integrated circuit, and realizing rapid switching of a large-range wavelength division multiplexing channel by utilizing tuning of a small-range wavelength;
The method specifically comprises the following steps:
S101, preparing two sets of filters with similar structures and slightly different free spectrum ranges through a standard process of a chip integrated optical path, realizing filter cascading through a transmission waveguide, preparing a grating coupler, guiding a signal light field into or out of a chip, enabling the signal light field to enter a carrier straight waveguide through the grating coupler, enabling the signal light field to enter a micro-ring 1 through evanescent wave coupling, outputting the signal light field from a downloading side to the carrier straight waveguide, enabling the signal light field to enter a micro-ring 2 through evanescent wave coupling, outputting the signal light field from the downloading side to the carrier straight waveguide and outputting the signal light field from an upper right grating coupler;
S102, preparing a filter control electrode through a standard process of a chip integrated circuit, connecting the control electrode with a pin electrode by utilizing an integrated lead, and enabling a band-pass peak of the micro-ring 1 to coincide with wavelength division multiplexing channels Ch 1-Ch 4 by controlling bias voltage loaded on the micro-ring 1;
S103, loading bias voltage to a filter through a pin electrode, realizing specific wavelength division multiplexing channel output and switching through tuning the band-pass spectrum center wavelength of the filter, enabling one band-pass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch1 by controlling the bias voltage loaded on the micro-ring 2 according to the working principle of a vernier caliper, enabling the available wavelength division multiplexing channels to be Ch1 and Ch4 at the moment, and increasing the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be overlapped with the wavelength division multiplexing channel Ch2 at the moment, wherein the available wavelength division multiplexing channel is Ch2.
2. The method for switching wavelength division multiplexing channels of vernier caliper according to claim 1, wherein when one band-pass peak of the micro-ring 2 coincides with the wavelength division multiplexing channel Ch3, the available wavelength division multiplexing channel is Ch3.
3. The method for switching wavelength division multiplexing channels of vernier caliper according to claim 1, wherein the radius of the micro-ring 1 is slightly smaller than that of the micro-ring 2, so that the free spectral range of band-pass filtering of the micro-ring 1 is slightly larger than that of the micro-ring 2.
4. A system for implementing the vernier caliper-like wavelength division multiplexing channel switching method according to any one of claims 1 to 3, comprising:
The filter preparation, cascading and independent control device is used for preparing and integrating two multi-wavelength filters with similar structures and slightly different free spectrum ranges on a single chip, realizing independent tuning of the center wavelength of the filter through externally connecting bias voltage, and realizing filter cascading by using chip integrated waveguides;
the wavelength division multiplexing channel switching device is used for precisely regulating and controlling the center wavelength of the filter by controlling the bias voltage, so that the band-pass spectrum is overlapped on a specific wavelength division multiplexing channel, and the rapid switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength.
5. A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the method of any of claims 1-3.
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