CN114614938A - Wavelength division multiplexing channel switching method of vernier-like caliper - Google Patents
Wavelength division multiplexing channel switching method of vernier-like caliper Download PDFInfo
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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
- G02B6/29331—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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- 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
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- 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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- 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
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Abstract
The invention discloses a vernier caliper-like wavelength division multiplexing channel switching method, which comprises the steps of cascading two multi-wavelength band-pass filters with slightly different free spectral ranges; the band-pass spectrums of the two filters are superposed at a specific wavelength channel by micro tuning according to the working principle of a vernier caliper; and the fast switching of the large-range wavelength division multiplexing channel is realized by using the small-range wavelength tuning. The invention can improve the performance of the chip integrated filter through system optimization design based on the existing process level, effectively solves the bottleneck problems that the chip integrated filter has a small tuning range and cannot adapt to the requirement of fast switching of wavelength division multiplexing channels, and provides 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 interdisciplinary field of integrated optics, optical communication and microwave photonics, in particular to a method for realizing large-range wavelength division multiplexing channel switching by cascading band-pass filters with small difference in free spectral range and utilizing small-range wavelength tuning according to the working principle of a vernier caliper, and particularly relates to a method, a system and a storage medium for wavelength division multiplexing channel switching of the vernier caliper.
Background
The photoelectric information system mainly realizes various complex information functions through an optical effect, is the most widely applied optical communication system at present, and 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, with the exponential rise of optical communication rate, the means of wavelength division multiplexing, partial division multiplexing, time division multiplexing, mode division multiplexing and the like are increasingly popularized, and the large-scale practical upgrading process of the optical communication system is seriously lagged by the loose coupling integration mode of the existing free space optical path and the full optical fiber optical path. On the other hand, chip-based integrated all-optical communication systems have been rapidly developed in recent years. The chip integrated optical circuit has the advantages of small volume, low power consumption, rich functions, stable performance, integrated board card, batch preparation and the like, is highly compatible with the traditional chip integrated circuit process, can mix the integrated functional optical circuit and the logic circuit on a single chip, and is expected to become the preferred technical scheme of a future all-optical communication system.
The wavelength division multiplexing technology is widely applied in the fields of optical fiber communication, quantum communication, microwave photon signal processing and the like; the performance of a wdm system is highly dependent on the performance of the multi-wavelength bandpass filter. Specifically, the multi-wavelength band-pass filter needs to have a free spectral range consistent with the International Telecommunication Union (ITU) frequency spacing standard, and further needs to have a high extinction ratio, a large tuning bandwidth, and the like. However, the conventional chip integrated filter mainly realizes tuning through a thermo-optic effect, has a 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 in the prior art, the technical problem to be solved by the invention is how to integrate two multi-wavelength filters with similar structures and slightly different free spectral ranges on a single chip, and to independently control the central wavelength of the filters by using the bias voltage loaded by a control electrode through transmission waveguide cascade connection, so that the band-pass spectrums of the two filters are superposed at a specific wavelength division multiplexing channel, and the fast switching of a large-range wavelength division multiplexing channel is realized by using small-range wavelength tuning.
In order to achieve the effect, the wavelength division multiplexing channel switching method of the vernier-like caliper, provided by the invention, is characterized in that two multi-wavelength filters with similar structures and different free spectral ranges are integrated on a single chip, the independent tuning of the central wavelength of the filter is realized through external bias voltage, and the cascade connection of the filters is realized by utilizing chip integrated waveguides; the center wavelength of the filter is accurately regulated and controlled by controlling the bias voltage, so that band-pass spectrums are superposed on a specific wavelength division multiplexing channel, and the fast switching of a large-range wavelength division multiplexing channel is realized by tuning a small-range wavelength;
two chip integrated multi-wavelength band-pass filters with slightly different free spectral ranges are cascaded, the central wavelengths of the band-pass spectrums of the two filters are enabled to coincide with a specific wavelength through the control of a chip integrated circuit, and the fast switching of a large-range wavelength division multiplexing channel is realized by utilizing the tuning of a small-range wavelength.
Preferably, the method specifically comprises:
s101, two sets of filters with similar structures and slightly different free spectral ranges are prepared through a standard process of a chip integrated optical circuit, filter cascade is realized through a transmission waveguide, and a grating coupler is prepared to lead a signal light field into or out of a chip;
s102, preparing a filter control electrode through a chip integrated circuit standard process, and connecting the control electrode with a pin electrode by using an integrated lead;
and S103, loading bias voltage to the filter through the pin electrode, and realizing output and switching of a specific wavelength division multiplexing channel by tuning the band-pass spectrum center wavelength of the filter.
Preferably, the method specifically comprises:
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 download side, enters a micro-ring 2 through evanescent wave coupling, is output to the carrier straight waveguide from the download side and is output from an upper right-corner grating coupler;
step 2, the bandpass peak of the micro-ring 1 can be coincided with the wavelength division multiplexing channels Ch 1-Ch 4 by controlling the bias voltage loaded on the micro-ring 1;
and 3, according to the working principle of the vernier caliper, controlling the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be coincided with the wavelength division multiplexing channel Ch1, enabling the wavelength division multiplexing channels Ch1 and Ch4, increasing the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be coincided with the wavelength division multiplexing channel Ch2, and enabling the wavelength division multiplexing channel Ch 2.
Preferably, when one bandpass peak of the micro-ring 2 coincides with the wavelength division multiplexing channel Ch3, the wavelength division multiplexing channel used in this case is Ch 3.
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 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 a thermo-optic effect, an electro-optic effect and a photoelectric effect.
Preferably, the method is prepared by a chip integrated circuit standard process, has certain structural design freedom, changes the refractive index of a transmission waveguide in the filter structure to realize the central wavelength tuning of the filter, 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 sizes and wiring parameters of the control electrode, the integrated lead and the pin electrode.
Preferably, the two multi-wavelength filters have free spectral ranges of M and N, respectively, M > N and M meets ITU frequency spacing standards, and the bandpass spectrum of the first filter (M) is matched with ITU wavelength channels by tuning; when the tuning value of the second filter (N) is M-N, the switching of adjacent wavelength channels with the span of M can be realized, and when the tuning value of the second filter (N) is N times of the M-N, the switching of separated wavelength channels with the span of Mn can be realized; 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, cascade connection and independent control device is used for preparing and integrating two multi-wavelength filters with similar structures and slightly different free spectral ranges on a single chip, realizing independent tuning of the central wavelength of the filter by external bias voltage and realizing filter cascade connection by utilizing a chip integrated waveguide;
the wavelength division multiplexing channel switching device is used for accurately regulating and controlling the central wavelength of the filter by controlling the bias voltage, so that the band-pass spectrum is superposed on a specific wavelength division multiplexing channel, and the fast switching of the wavelength division multiplexing channel with a large range is realized by tuning the wavelength with a small range.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
Compared with the prior art, the invention can realize the performance improvement of the chip integrated filter through system design based on the prior art level, provides technical reference for a broadband tunable dense wavelength division multiplexing system, and provides important support for the standardized large-scale application of the photoelectric chip for optical communication.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic diagram of the principle of wavelength division multiplexing channel switching based on cascaded micro-rings of the vernier-like caliper of 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 vernier caliper-like wavelength division multiplexing channel switching method, which is characterized in that two multi-wavelength filters with similar structures and different free spectral ranges are prepared and integrated on a single chip, the independent tuning of the central wavelength of the filter is realized by external bias voltage, and the cascade connection of the filter is realized by utilizing a chip integrated waveguide; the central wavelength of the filter is accurately regulated and controlled by controlling the bias voltage, so that band-pass spectrums are superposed on a specific wavelength division multiplexing channel, and the fast switching of a large-range wavelength division multiplexing channel is realized by tuning the small-range wavelength;
two chip integrated multi-wavelength band-pass filters with slightly different free spectral ranges are cascaded, the central wavelengths of the band-pass spectrums of the two filters are enabled to coincide with a specific wavelength through the control of a chip integrated circuit, and the fast switching of a large-range wavelength division multiplexing channel is realized by utilizing the tuning of a small-range wavelength.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier-like caliper, which comprises the following steps:
s101, two sets of filters with similar structures and slightly different free spectral ranges are prepared through a standard process of a chip integrated optical circuit, filter cascade is realized through a transmission waveguide, and a grating coupler is prepared to lead a signal light field into or out of a chip;
s102, preparing a filter control electrode through a chip integrated circuit standard process, and connecting the control electrode with a pin electrode by using an integrated lead;
s103, loading bias voltage to the filter through the pin electrode, and realizing output and switching of the specific wavelength division multiplexing channel by tuning the band-pass spectrum center wavelength of the filter.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier-like 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 download side, enters a micro-ring 2 through evanescent wave coupling, is output to the carrier straight waveguide from the download side and is output from an upper right-corner grating coupler;
step 2, enabling the bandpass peaks of the micro-ring 1 to be superposed on the wavelength division multiplexing channels Ch 1-Ch 4 by controlling the bias voltage loaded on the micro-ring 1;
and 3, according to the working principle of the vernier caliper, controlling the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be coincided with the wavelength division multiplexing channel Ch1, enabling the wavelength division multiplexing channels Ch1 and Ch4, increasing the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be coincided with the wavelength division multiplexing channel Ch2, and enabling the wavelength division multiplexing channel Ch 2.
In some embodiments, when one bandpass peak of the microring 2 coincides with the wavelength division multiplexing channel Ch3, the wavelength division multiplexing channel used in this case is Ch 3.
In some embodiments, 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.
In some embodiments, the optical waveguide is prepared by a standard chip integrated optical circuit process, has a certain degree of freedom of structural design, 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 a thermo-optic effect, an electro-optic effect and a photoelectric effect.
In some embodiments, the filter is manufactured by a chip integrated circuit standard process, has a certain degree of structural design freedom, 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 size and the wiring parameters of the control electrode, the integrated lead and the pin electrode.
In some embodiments, the two multi-wavelength filters have free spectral ranges of M and N, respectively, M > N and M complies with the ITU frequency spacing standard, the first filter (M) bandpass spectrum being coincident with the ITU wavelength channel by tuning; when the tuning value of the second filter (N) is M-N, the switching of adjacent wavelength channels with the span of M can be realized, and when the tuning value of the second filter (N) is N times of the M-N, the switching of separated wavelength channels with the span of Mn can be realized; 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, cascade connection and independent control device is used for preparing and integrating two multi-wavelength filters with similar structures and slightly different free spectral ranges on a single chip, realizing independent tuning of the central wavelength of the filter by external bias voltage and realizing the cascade connection of the filter by utilizing a chip integrated waveguide;
the wavelength division multiplexing channel switching device is used for accurately regulating and controlling the central wavelength of the filter by controlling the bias voltage, so that the band-pass spectrum is superposed on a specific wavelength division multiplexing channel, and the fast switching of the wavelength division multiplexing channel with a large range is realized by tuning the wavelength with a small range.
As shown in fig. 1, the present invention provides an embodiment of a wavelength division multiplexing channel switching method based on a cascade micro-ring, in which a signal light field enters a carrier straight waveguide through a grating coupler at the lower left corner, enters a micro-ring 1 through evanescent coupling, is output from a download side to the carrier straight waveguide, enters a micro-ring 2 through evanescent coupling, is output from the download side to the carrier straight waveguide, and is output from the 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 coincided with the wavelength division multiplexing channels Ch 1-Ch 4 by controlling the bias voltage loaded on the micro-ring 1, and the bandwidth range is 3 times of the free spectral range of the micro-ring 1 and 4 times of the free spectral range of the micro-ring 2; according to the working principle of a vernier caliper, one band-pass peak of the micro-ring 2 can be coincided with the wavelength division multiplexing channel Ch1 by controlling the bias voltage loaded on the micro-ring 2, at this time, the available wavelength division multiplexing channels are Ch1 and Ch4, and further increasing the bias voltage loaded on the micro-ring 2 can make one band-pass peak of the micro-ring 2 be coincided with the wavelength division multiplexing channel Ch2, at this time, the available wavelength division multiplexing channel is Ch2, and similarly, when one band-pass peak of the micro-ring 2 is coincided with the wavelength division multiplexing channel Ch3, the available wavelength division multiplexing channel is Ch3 at this time.
The invention provides an embodiment of a wavelength division multiplexing channel switching method of a vernier-like caliper, which comprises the following steps:
s101, two sets of filters with similar structures and slightly different free spectral ranges are prepared through a standard process of a chip integrated optical circuit, filter cascade is realized through a transmission waveguide, and a grating coupler is prepared to lead a signal light field into or out of a chip;
s102, preparing a filter control electrode through a chip integrated circuit standard process, and connecting the control electrode with a pin electrode by using an integrated lead;
s103, loading bias voltage to the filter through the pin electrode, and realizing output and switching of the specific wavelength division multiplexing channel by tuning the band-pass spectrum center wavelength of the filter.
The invention provides an embodiment of a vernier caliper-like wavelength division multiplexing channel switching method, which comprises the steps of cascading two chip integrated multi-wavelength band-pass filters with slightly different free spectral ranges, enabling the center wavelengths of band-pass spectrums of the two filters to coincide with a specific wavelength through the control of a chip integrated circuit, and realizing the quick switching of a large-range wavelength division multiplexing channel by utilizing the tuning of a small-range wavelength.
In some embodiments, the chip integrated filter can be fabricated by standard processes for chip integrated optical circuits, 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 a refractive index of a waveguide, and can tune fundamental principles including but not limited to a thermo-optical effect, an electro-optical effect, a photoelectric effect, and the like, typical structures include but not limited to arrayed waveguide gratings, mach-zehnder interferometers, micro-ring cavities, echo wall micro-disk cavities, photonic crystal slow-light micro-cavities, fabry-perot cavities, bragg gratings, and the like, cascaded filters can have the same structure or different structures, and material platforms used include but not limited to silicon on insulators, hydrogen-loaded amorphous silicon, silicon nitride, silicon carbide, chalcogenide glass, three-five-group aluminum gallium arsenide, three-five-group indium phosphide, and the like, the method can be a single material integration method or a multi-material mixing integration method.
In some embodiments, the chip integrated circuit can be prepared by a chip integrated circuit standard process, has a certain degree of structural design freedom, can change the refractive index of a transmission waveguide in a filter structure to realize the central wavelength tuning of the filter, can be connected to an external logic circuit through a control electrode-integrated wire-pin electrode, can receive bias voltages with different intensities, and does not limit the structural size and wiring parameters of the control electrode, the integrated wire and the pin electrode.
In some embodiments, the wavelength channels are switched fast, the two filters have free spectral ranges of M and N, respectively, M > N and M complies with the ITU frequency spacing standard, the first filter (M) bandpass spectrum is coincident with the ITU wavelength channels by tuning; when the tuning value of the second filter (N) is M-N, the switching of adjacent wavelength channels with the span of M can be realized, and when the tuning value of the second filter (N) is N times of the M-N, the switching of separated wavelength channels with the span of Mn can be realized; 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 spectrum shape, and the like 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 which is based on the existing chip integrated filter preparation process level and fully considers the limited technical situation of the chip integrated device tuning range, and the small-range wavelength tuning realizes the rapid switching of the large-range wavelength division multiplexing channel. Through simple calculation, two filters with free spectral ranges of M and N are cascaded (M > N and M meets ITU frequency interval standard), when the band-pass spectrum of the first filter (M) is superposed on an ITU wavelength channel, the second filter (N) can realize the switching of the wavelength channel with the span of M only by tuning M-N, and when the full width at half maximum of the band-pass spectrum is less than M/(M-N), the bandwidth range corresponding to the least common multiple of M and N is provided with one wavelength channel and only one wavelength channel.
Secondly, the wavelength division multiplexing channel switching method can greatly compress the full width at half maximum of a band-pass spectrum and improve the directional optical wall in multiples while rapidly switching the wavelength division multiplexing channel, and is expected to improve the frequency domain resolution of a wavelength division multiplexing system.
In addition, the wavelength division multiplexing channel switching method is highly compatible with the existing preparation process level, the idea of realizing the performance improvement of the filter through the design of the chip integrated optical circuit has higher engineering practicability, and can provide important reference 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 divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A vernier caliper-like wavelength division multiplexing channel switching method is characterized in that two multi-wavelength filters with similar structures and different free spectral ranges are prepared and integrated on a single chip, independent tuning of the central wavelength of the filter is realized through external bias voltage, and cascade connection of the filters is realized by utilizing chip integrated waveguides; the central wavelength of the filter is accurately regulated and controlled by controlling the bias voltage, so that band-pass spectrums are superposed on a specific wavelength division multiplexing channel, and the fast switching of a large-range wavelength division multiplexing channel is realized by tuning the small-range wavelength;
two chip integrated multi-wavelength band-pass filters with slightly different free spectral ranges are cascaded, the central wavelengths of the band-pass spectrums of the two filters are enabled to coincide with a specific wavelength through the control of a chip integrated circuit, and the fast switching of a large-range wavelength division multiplexing channel is realized by utilizing the tuning of a small-range wavelength.
2. The method for switching wavelength division multiplexing channels of a vernier caliper like in claim 1, specifically comprising:
s101, two sets of filters with similar structures and slightly different free spectral ranges are prepared through a standard process of a chip integrated optical circuit, filter cascade is realized through a transmission waveguide, and a grating coupler is prepared to lead a signal light field into or out of a chip;
s102, preparing a filter control electrode through a chip integrated circuit standard process, and connecting the control electrode with a pin electrode by using an integrated lead;
and S103, loading bias voltage to the filter through the pin electrode, and realizing output and switching of a specific wavelength division multiplexing channel by tuning the band-pass spectrum center wavelength of the filter.
3. The vernier caliper-like wavelength division multiplexing channel switching method according to claim 1 or 2, wherein the method comprises:
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 download side, enters a micro-ring 2 through evanescent wave coupling, is output to the carrier straight waveguide from the download side and is output from an upper right-corner grating coupler;
step 2, enabling the bandpass peaks of the micro-ring 1 to be superposed on the wavelength division multiplexing channels Ch 1-Ch 4 by controlling the bias voltage loaded on the micro-ring 1;
and 3, according to the working principle of the vernier caliper, controlling the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be coincided with the wavelength division multiplexing channel Ch1, enabling the wavelength division multiplexing channels Ch1 and Ch4, increasing the bias voltage loaded on the micro-ring 2 to enable one band-pass peak of the micro-ring 2 to be coincided with the wavelength division multiplexing channel Ch2, and enabling the wavelength division multiplexing channel Ch 2.
4. The method as claimed in claim 3, wherein when a band-pass peak of the micro-ring 2 coincides with the wavelength division multiplexing channel Ch3, the wavelength division multiplexing channel is Ch 3.
5. The method for switching wavelength division multiplexing channels of a vernier caliper like in claim 3, 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 the band-pass filtering of the micro-ring 1 is slightly larger than that of the micro-ring 2.
6. The method for switching wavelength division multiplexing channels of a vernier caliper like in claim 1, wherein the method is prepared by a standard process of a chip integrated optical path, has a certain degree of freedom of structural design, can efficiently and losslessly transmit an optical field, has a certain band-pass or band-stop capability in a frequency domain, can realize transmission spectrum tuning by changing a waveguide refractive index, and can tune fundamental principles including but not limited to thermo-optic effect, electro-optic effect and photoelectric effect.
7. The method according to claim 1, wherein the method is manufactured by standard processes of chip integrated circuits, has a certain degree of freedom of structural design, changes the refractive index of transmission waveguides in the filter structure to realize the tuning of the central wavelength of the filter, connects the filter to an external logic circuit through control electrodes, integrated wires and pin electrodes, receives bias voltages of different intensities, and does not limit the structural dimensions and wiring parameters of the control electrodes, the integrated wires and the pin electrodes.
8. The method for switching wavelength division multiplexing channels of a vernier caliper like in claim 1, wherein the two multi-wavelength filters have free spectral ranges of M and N, respectively, M > N and M complies with ITU frequency spacing standard, the first filter (M) bandpass spectrum is matched to ITU wavelength channels by tuning; when the tuning value of the second filter (N) is M-N, the switching of adjacent wavelength channels with the span of M can be realized, and when the tuning value of the second filter (N) is N times of the M-N, the switching of separated wavelength channels with the span of Mn can be realized; 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.
9. A system for implementing the method for wavelength division multiplexing channel switching of a vernier caliper like in claims 1 to 8, comprising:
the filter preparation, cascade connection and independent control device is used for preparing and integrating two multi-wavelength filters with similar structures and slightly different free spectral ranges on a single chip, realizing independent tuning of the central wavelength of the filter by external bias voltage and realizing filter cascade connection by utilizing a chip integrated waveguide;
the wavelength division multiplexing channel switching device is used for accurately regulating and controlling the central wavelength of the filter by controlling the bias voltage, so that the band-pass spectrum is superposed on a specific wavelength division multiplexing channel, and the fast switching of the wavelength division multiplexing channel with a large range is realized by tuning the wavelength with a small range.
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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