CN113466999B - Optical filter and optical communication equipment using same - Google Patents
Optical filter and optical communication equipment using same Download PDFInfo
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- CN113466999B CN113466999B CN202110765224.1A CN202110765224A CN113466999B CN 113466999 B CN113466999 B CN 113466999B CN 202110765224 A CN202110765224 A CN 202110765224A CN 113466999 B CN113466999 B CN 113466999B
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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
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/29395—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device configurable, e.g. tunable or reconfigurable
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- 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
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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
- G02F1/0113—Glass-based, e.g. silica-based, optical waveguides
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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
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
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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
- G02F1/0147—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 based on thermo-optic effects
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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
- G02F1/03—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 based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/035—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 based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect in an optical waveguide structure
Abstract
The present disclosure provides an optical filter comprising: the optical waveguide unit is used for inputting a broadband optical signal to be processed, providing an optical path transmission path without filtering processing for the optical signal and outputting the filtered optical signal; the optical filter unit of the microdisk, including n-level optical filter of microdisk, is used for carrying on the filtering treatment to the broadband optical signal to be treated; wherein n is a positive integer greater than 1; the optical switch unit is used for receiving the optical signal and controlling the transmission path of the optical signal by switching the optical switch unit, so that the optical signal is filtered by at least one stage of microdisk optical filter to form a new free spectral region. According to the optical filter, the number of the microdisk optical filters through which broadband optical signals pass in a path is changed flexibly through the optical switch, so that reconstruction of optical filtering and tunability of a free spectral region are achieved, and the requirement of the optical filter on flexibility of the free spectral region in the technical field of optical fiber communication is met.
Description
Technical Field
The present disclosure relates to the field of optical fiber communication technologies, and in particular, to an optical filter and an optical communication device using the same.
Background
In optical network transmission, a reconfigurable optical add-drop multiplexer (ROADM) is a key node device for realizing the progress of the existing WDM network to an all-optical network. The optical filter is used as a key unit of next generation ROADM, and besides the tunable characteristics of the existing research on wider central wavelength and filter bandwidth, the flexibility of the free spectral range is also an important index of the ROADM system.
Common optical filters usually adopt structures such as Fiber Bragg Gratings (FBGs), mach-zehnder (MZs), micro-disk resonators (MRRs), and the like, but when the structures are adopted alone, the problem that the free spectral region is not tunable exists, so that the requirement of a ROADM system on flexibility of the free spectral region of the optical filter cannot be met.
Disclosure of Invention
In view of the above, the present disclosure provides an optical filter and an optical communication device using the same.
In one aspect of the present disclosure, there is provided an optical filter including:
the optical waveguide unit is used for inputting a broadband optical signal to be processed, providing an optical path transmission path without filtering processing for the optical signal and outputting the filtered optical signal;
the optical filter unit of the microdisk, including the optical filter of n-level microdisk, is used for carrying on the filtering treatment to the broadband optical signal to be treated; wherein n is a positive integer greater than 1;
and the optical switch unit is used for receiving the optical signal and controlling the transmission path of the optical signal by switching the optical switch unit so that the optical signal is subjected to filtering processing of at least one stage of microdisk optical filter to form a new free spectral region.
Preferably, the optical switch unit includes M optical switches, M being a positive integer greater than 1; the microdisk optical filter unit comprises a first microdisk optical filter and a plurality of microdisk optical filter subunits, and each microdisk optical filter subunit comprises at least one stage of microdisk optical filter; the first micro-disk optical filter is used for carrying out primary filtering on a broadband optical signal to be processed; the M optical switches are arranged in a staggered mode with a plurality of microdisk optical filter subunits, and the transmission path of the primarily filtered optical signal is controlled by switching the state of each optical switch to form a new free spectral region.
Preferably, the optical waveguide unit includes: the input optical waveguide is used for inputting a broadband optical signal to be processed; the M-1 level intermediate optical waveguide is used for forming an optical path part which corresponds to the optical switch and does not pass through the corresponding microdisk optical filter subunit in the optical path; m is a positive integer greater than 1; and the output optical waveguide is used for outputting the filtered optical signal.
Preferably, each stage of the microdisk optical filter has a periodic downloaded spectrum at the resonant wavelength; each stage of the microdisk optical filter comprises a straight waveguide and a microdisk resonator, wherein the microdisk resonator is arranged on one side of the straight waveguide and is used for filtering out the optical signal wave band meeting the microdisk resonance condition in the straight waveguide from the spectrum.
Preferably, the design parameters of each stage of the microdisk optical filter are the same, wherein the design parameters at least include: the distance between the microdisc resonator and the straight waveguide; the radius of the microdisk resonator; the width and thickness of the straight waveguide; and materials used for the microdisk resonator and the straight waveguide; when a broadband optical signal to be processed passes through k micro-disk optical filters, the size of the free spectral region is 1/k of the size of the free spectral region formed by only passing through the first-stage micro-disk optical filter, wherein k is a positive integer.
Preferably, the tuning of the resonant wavelength of the microdisk optical filter unit can be realized by independently tuning the resonant wavelength of the n-level microdisk optical filter.
Preferably, the switching of the states of the optical switching cells and the tuning of the resonance wavelength of the microdisk optical filter are achieved by thermo-optical or electro-optical effects.
Preferably, the optical switch unit and/or the microdisk optical filter are made of a material including lithium niobate, silicon dioxide, indium phosphide or gallium arsenide.
Preferably, the optical switch unit employs a directional coupling type optical switch or an MZ type optical switch.
In another aspect of the present disclosure, there is provided an optical communication device applying the optical filter as described above.
In the technical scheme disclosed by the disclosure, the quantity of the microdisk optical filters passed by the broadband optical signals in the path is flexibly changed by utilizing the optical switch, so that the reconstruction of optical filtering and the tunability of the free spectral region are realized, and the requirement of the ROADM system on the flexibility of the free spectral region of the optical filter is further met.
Drawings
Fig. 1 shows a schematic structural diagram of an optical filter according to an embodiment of the present disclosure.
Description of the reference numerals:
101: an input optical waveguide;
102: an output optical waveguide;
201: a first microdisk optical filter;
202. 203, 20N: a microdisk optical filter subunit;
301. 302, 303, 402, 40 (N-2): an optical switch;
401. 402, 40 (M-1): an intermediate optical waveguide.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
As described in the background, the conventional optical filter has a problem that the free spectral range is not tunable, so that the requirement of the ROADM system for flexibility of the free spectral range of the optical filter cannot be satisfied. In view of the above, the present disclosure provides an optical filter and an optical communication device using the same, so as to at least partially solve the above technical problems.
An embodiment of the present disclosure provides an optical filter including: an optical waveguide unit, a microdisk optical filter unit, and an optical switch unit.
The optical waveguide unit is used for inputting a broadband optical signal to be processed, providing an optical path transmission path for the optical signal without filtering processing, and outputting the filtered optical signal.
The optical filter unit comprises an n-level optical filter unit for filtering the broadband optical signal to be processed, wherein n is a positive integer greater than 1.
The optical switch unit is used for receiving the optical signal and controlling the transmission path of the optical signal by switching the optical switch unit, so that the optical signal is filtered by at least one stage of microdisk optical filter to form a new free spectral region.
The optical filter in the embodiment of the disclosure flexibly changes the number of microdisk optical filters through which broadband optical signals pass in a path by using the optical switch, thereby realizing reconstruction of optical filtering and tunability of a free spectral range, and further meeting the requirement of a ROADM system on flexibility of the free spectral range of the optical filter.
In some embodiments of the present disclosure, the optical waveguide unit includes an input optical waveguide, an M-1 order intermediate optical waveguide, and an output optical waveguide, M being a positive integer greater than 1. The input optical waveguide is used for inputting a broadband optical signal to be processed, the M-1 level intermediate optical waveguide is used for forming an optical path part which corresponds to the optical switch and does not pass through the corresponding optical filter subunit in the optical path, and the output optical waveguide is used for outputting the filtered optical signal.
In some embodiments of the present disclosure, the microdisk optical filter unit includes a first microdisk optical filter and a plurality of microdisk optical filter subunits, where each microdisk optical filter subunit includes at least one stage of microdisk optical filter. The sum of the number of the first microdisk optical filter and the microdisk optical filters in all the microdisk optical filter subunits is n (n is a positive integer greater than 1), that is, the microdisk optical filter unit comprises n stages of microdisk optical filters.
Each stage of the microdisk optical filter comprises a straight waveguide and a microdisk resonator, wherein the microdisk resonator is arranged on one side of the straight waveguide and is used for filtering out the optical signal wave band meeting the microdisk resonance condition in the straight waveguide from the spectrum.
Each stage of the microdisk optical filter can carry out filtering processing on the optical signal. Specifically, each stage of the microdisk optical filter has a periodic download spectrum at the resonant wavelength, and when an optical signal passes through the ith (i is more than 1 and less than or equal to n) stage of the microdisk optical filter, the corresponding ith stage of the microdisk optical filter has a periodic download spectrum at the resonant wavelength, so that a deep groove is inserted at the corresponding resonant wavelength in the formed spectrum, and a new free spectral region is formed.
In the embodiment of the disclosure, the tuning of the resonant wavelength of the microdisk optical filter unit can be realized by independently tuning the resonant wavelength of the n-level microdisk optical filter. Wherein, the resonant wavelength tuning of the optical filter of the microdisk can be realized by thermo-optic effect or electro-optic effect. The tuning mode of the resonant wavelength can be selected according to practical application, and is not limited herein.
It should be noted that the number of the microdisk optical filters in each microdisk optical filter subunit may be the same, may be different from each other, or may be partially the same. For example, each microdisk optical filter subunit has a stage of microdisk optical filter, and all microdisk optical filter subunits have the same number of microdisk optical filters. For example, the number of microdisk optical filters in the first microdisk optical filter subunit may be two, the number of microdisk optical filters in the second microdisk optical filter subunit may be three, the number of microdisk optical filters in the third microdisk optical filter subunit may be four, five, or ten, and so on, and in this case, different numbers of microdisk optical filters may be provided in each microdisk optical filter subunit. The number of the microdisk optical filters in each microdisk optical filter subunit may be specifically set according to actual needs, and is not limited herein.
IB212617W
In addition, in some embodiments of the present disclosure, design parameters of each stage of the microdisk optical filter in the microdisk optical filter unit may be the same or different, and may be specifically set according to an actual situation, which is not limited herein. Wherein the design parameters at least include: the distance between the microdisk resonator and the straight waveguide, the radius of the microdisk resonator, the width and thickness of the straight waveguide, the materials used for the microdisk resonator and the straight waveguide, and the like. For example, the materials used for each stage of the microdisk optical filter include, but are not limited to, lithium niobate, silicon dioxide, indium phosphide, or gallium arsenide.
In the embodiment of the present disclosure, the first microdisk optical filter is connected to the output end of the input optical waveguide, and is configured to perform primary filtering on a to-be-processed broadband optical signal, so as to implement an initial filtering period.
In an embodiment of the present disclosure, the optical switch unit includes M optical switches, each of which includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input end and the second input end are used for receiving optical signals, and the first output end and the second output end are used for switching transmission paths of the optical signals.
In some embodiments of the present disclosure, switching of states of each optical switch in the optical switch unit may be achieved through a thermo-optical effect or an electro-optical effect, which may be specifically set according to actual needs, and is not limited herein.
In some embodiments of the present disclosure, the optical switch cells are made of materials including, but not limited to, lithium niobate, silicon dioxide, indium phosphide, or gallium arsenide. The optical switch unit is, for example, a directional coupling type optical switch or an MZ type optical switch, and in some other embodiments, other suitable optical switches may also be used, which is not limited herein.
The M optical switches and the plurality of optical filter subunits of the microdisk are arranged in a staggered mode, the transmission path of the primarily filtered optical signal can be controlled by switching the state of each optical switch, a new filtering period is obtained, and the free spectral region is changed.
As described above, each stage of the microdisk optical filter can filter the optical signal, and it can be understood that the design parameters of each stage of the microdisk optical filter, such as the distance between the microdisk resonator and the straight waveguide, the radius of the microdisk resonator, the width and thickness of the straight waveguide, and the materials used for the microdisk resonator and the straight waveguide, may affect the filtering function of the optical filter and the tunability of the free spectral range, and different effects may be obtained if each stage of the microdisk optical filter is set to different design parameters. In the embodiment of the present disclosure, in order to facilitate the description of the advantages of the technical solution of the present disclosure, the filter period and the tunability of the free spectral range will be described in detail below by taking the design parameters of each stage of the microdisk optical filter as examples, and it should be understood that the description herein by taking the design parameters of each stage of the microdisk optical filter as examples is a preferred example of the technical solution of the present disclosure, and is not a limitation of the technical solution of the present disclosure.
For example, under the condition that the design parameters of each stage of the microdisc optical filter are the same (wherein the design parameters include but are not limited to the distance between the microdisc resonator and the straight waveguide, the radius of the microdisc resonator, the width and the thickness of the straight waveguide, the materials adopted by the microdisc resonator and the straight waveguide, and the like), the path of the optical signal is switched by using each optical switch, a group of filter stripes which are the same as the initial filter period are added on the spectral line of the optical signal by the microdisc optical filter through which the optical signal passes, and the corresponding filter curve is translated by adjusting the resonant wavelength of the corresponding microdisc optical filter, so that a new filter period is obtained, that is, the free spectral region is changed, and the filter function of the reconfigurable optical filter is completed.
The size of the formed new free spectral region is inversely proportional to the number of the micro-disk optical filters passing through, the number k (k is a positive integer) of the micro-disk optical filters passing through by the optical signal can be determined by adjusting the switching of the optical switch, and the position of the resonance wavelength of the micro-disk optical filters can be adjusted, so that the size of the free spectral region is 1/k of the size of the free spectral region formed only by the first-stage micro-disk optical filter (namely, the free spectral region is filtered by the first micro-disk optical filter). For example, when a broadband optical signal to be processed passes through the first-order microdisk optical filter, the size of the Free Spectral Range is FSR (Free Spectral Range) corresponding to the first-order microdisk optical filter; when the broadband optical signal to be processed passes through the two stages of microdisk optical filters, the size of the free spectral region is FSR/2.
The following describes the technical solution of the present disclosure in detail with reference to the optical filter structure in a preferred embodiment of the present disclosure. In this embodiment, each microdisk optical filter subunit has a stage of microdisk optical filter, and the design parameters of each stage of microdisk optical filter are the same. It should be understood that the number, shape and structure of the parts in the optical filter shown in fig. 1 are only exemplary to help those skilled in the art understand the technical solution of the present disclosure, and are not intended to limit the protection scope of the present disclosure.
Fig. 1 is a schematic diagram of an optical filter according to a preferred embodiment of the present disclosure.
As shown in fig. 1, the optical filter includes: an optical waveguide unit, a microdisk optical filter unit, and an optical switch unit.
The optical waveguide unit includes an input optical waveguide 101, an M-1 order intermediate optical waveguide (401, 402, \8230;, 40 (M-1)), and an output optical waveguide 102, M being a positive integer greater than 1.
The microdisk optical filter unit comprises a first microdisk optical filter 201 and N-1 microdisk optical filter subunits, each microdisk optical filter subunit comprises a first level of microdisk optical filter, that is, the number N =1+1 × (N-1) = N (N is a positive integer greater than 1) of microdisk optical filters in the microdisk optical filter unit.
The optical switch unit includes M optical switches, wherein the optical switch 301 connected to the microdisk optical filter 201, the intermediate optical waveguide 401, and the microdisk optical filter subunit 202 is a 1 × 2 optical switch, the optical switch 30M connected to the microdisk optical filter 20N, the intermediate optical waveguide 40 (M-1), and the output optical waveguide 102 is a 2 × 1 optical switch, and the other optical switches are 2 × 2 optical switches. Where "1 × 2" indicates that the optical switch has one input terminal and two output terminals, "2 × 1" indicates that the optical switch has two input terminals and one output terminal, and "2 × 2" indicates that the optical switch has two input terminals and two output terminals.
In this embodiment, the optical filter has the following specific structure:
referring to fig. 1, an input optical waveguide 101 is connected to an input end of a first microdisk optical filter 201, and an output end of the first microdisk optical filter 201 is connected to an input end of an optical switch 301; a first output end and a second output end of the optical switch 301 are respectively connected with an input end of the microdisk optical filter subunit 202 and an input end of the intermediate optical waveguide 401; the first input end and the second input end of the optical switch 302 are respectively connected with the output end of the microdisk optical filter subunit 202 and the output end of the intermediate optical waveguide 401, and by analogy, M optical switches (301-30M) are staggered with N-1 microdisk optical filter subunits (202, 203, \8230;, 20N) and M-1 level intermediate optical waveguides (401-40 (M-1)). The output of the optical switch 30M is connected to the output optical waveguide 102.
The optical filter has the advantages of small size, high stability, low loss and small difficulty in adjustment and control, and can be integrated on a semiconductor platform through a semiconductor plane process.
The following will briefly explain the flexible change of the number of optical micro-disk filters passing through the path by means of the optical switch to tune the filtering period and the free spectral range based on the above optical filter structure.
Under the condition that the design parameters of all levels of the microdisk optical filters are the same, the paths of the optical signals are switched by utilizing each optical switch, a group of filter stripes which are the same as the initial filter period are added on the spectral lines of the optical signals by the microdisk optical filters through which the optical signals pass, and the corresponding filter curves are translated by adjusting the resonance wavelengths of the corresponding microdisk optical filters, so that a new filter period is obtained, the free spectral region is changed, and the filter function of the reconfigurable optical filter is completed.
The size of the formed new free spectral region is inversely proportional to the number of the micro-disk optical filters passing through, the number k (k is a positive integer) of the micro-disk optical filters passing through by the optical signal can be determined by adjusting the switching of the optical switch, and the size of the free spectral region can be 1/k of the size of the free spectral region formed by only passing through the first-stage micro-disk optical filter (namely, only passing through the filtering processing of the first micro-disk optical filter) by adjusting the position of the resonant wavelength of the micro-disk optical filter.
For example, when the optical switches 301 to 30 (M-1) are all in the state where the second output end passes, the first output end is blocked, the first input end of the optical switch 30M is blocked, the second input end passes, and the optical signal passes through the microdisk optical filter 201, the corresponding free spectral region is the largest, and the size of the corresponding free spectral region is FSR, that is, FSR corresponding to the first-stage microdisk optical filter.
For example, when the first output terminal of the optical switch 301 passes and the second output terminal thereof is blocked, the optical switches 302 to 30 (M-1) are all in the state of passing the second output terminal, blocking the first input terminal of the optical switch 30M and passing the second input terminal thereof, the optical signal passes through the microdisk optical filter 201 and the microdisk optical filter 202 (the resonant wavelength of the microdisk optical filter 202 can be adjusted by the thermo-optical effect or the electro-optical effect, and the filter spectrum of the microdisk optical filter 202 is shifted by FSR/2 with respect to the microdisk optical filter 201), and the corresponding free spectral range is FSR/2.
For example, when the first output terminal of the optical switch 301 and the first output terminal of the optical switch 302 are blocked, the second output terminal of the optical switch 303-30 (M-1) is in the state of passing the second output terminal, the first output terminal is blocked, the first input terminal of the optical switch 30M is blocked, and the second input terminal is passed, the optical signal passes through the microdisk optical filters 201, 202 and 203 (the resonant wavelengths of the microdisk optical filter 202 and the microdisk optical filter 203 can be adjusted by thermo-optical effect or electro-optical effect, the filtering spectrum of the microdisk optical filter 202 is shifted by FSR/3 with respect to the microdisk optical filter 201, the filtering spectrum of the microdisk optical filter 203 is shifted by FSR/3 with respect to the microdisk optical filter 202), and the corresponding free spectral range is FSR/3.
By analogy, when the optical switches 301 to 30M are in the state that the first output end passes through and the second output end is blocked, the optical signal passes through the microdisk optical filters 201 to 20N (except the microdisk optical filter 201, the resonance wavelength of each stage of microdisk optical filter can be adjusted by the thermo-optic effect or the electro-optic effect, the filtering spectrum of each stage of microdisk optical filter is translated by FSR/N relative to the previous stage of microdisk optical filter), at this time, the corresponding free spectral region is the smallest, and the size of the corresponding free spectral region is FSR/N.
Based on the above embodiments, the optical filter of the present disclosure flexibly changes the number of microdisk optical filters through which optical signals pass in a path by using an optical switch, thereby implementing reconfigurable optical filtering and tunable free spectral range.
Another aspect of the present disclosure also provides an optical communication device applying the optical filter as described above. The optical communication device includes all the technical features of the optical filter described above, that is, has the technical effects brought by all the technical features described above, and is not described herein again.
The optical communication equipment can flexibly change the number of the optical filters of the microdisk passed by the optical signal in the path by using the optical switch, thereby realizing reconfigurable optical filtering and tunable free spectral range.
In summary, the present disclosure provides an optical filter and an optical communication device using the same. The optical filter in the disclosure flexibly changes the number of microdisk optical filters passed by optical signals in a path by using the optical switch, thereby realizing reconfigurable optical filtering and free spectral range tunability.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (7)
1. An optical filter, comprising:
the optical waveguide unit is used for inputting broadband optical signals to be processed, providing optical path transmission paths for the optical signals without filtering processing, and outputting the filtered optical signals;
the optical filter unit of the microdisk, including the optical filter of n-level microdisk, is used for carrying on the filtering treatment to the said broadband optical signal to be treated; wherein n is a positive integer greater than 1;
the optical switch unit is used for receiving optical signals and controlling the transmission path of the optical signals by switching the optical switch unit so that the optical signals are subjected to filtering processing of at least one stage of the microdisk optical filter to form a new free spectral region;
the optical switch unit comprises M optical switches, wherein M is a positive integer greater than 1; the optical filter unit of the microdisk comprises a first microdisk optical filter and a plurality of optical filter subunits of the microdisk, and each optical filter subunit of the microdisk comprises at least one stage of optical filter of the microdisk; the first microdisk optical filter is used for carrying out primary filtering on the broadband optical signal to be processed; the M optical switches and the plurality of optical filter subunits of the microdisk are arranged in a staggered mode, and the transmission path of the primarily filtered optical signal is controlled by switching the state of each optical switch to form a new free spectral region;
the tuning of the resonance wavelength of the microdisk optical filter unit can be realized by independently tuning the resonance wavelength of the n stages of microdisk optical filters through a thermo-optical effect or an electro-optical effect;
each stage of the microdisk optical filter comprises a straight waveguide and a microdisk resonator, and the design parameters of each stage of the microdisk optical filter are the same, wherein the design parameters at least comprise: a distance between the microdisc resonator and the straight waveguide; a radius of the microdisk resonator; the width and thickness of the straight waveguide; and the materials used for the microdisk resonator and the straight waveguide;
when the broadband optical signal to be processed passes throughkWhen the micro-disk optical filter is arranged, the size of the free spectral region is 1 ^ er or greater than the size of the free spectral region formed by only passing through the first-stage micro-disk optical filterkWhereinkIs a positive integer.
2. The optical filter according to claim 1, wherein the optical waveguide unit comprises:
the input optical waveguide is used for inputting the broadband optical signal to be processed;
the M-1 level intermediate optical waveguide is used for forming an optical path part which corresponds to the optical switch and does not pass through the corresponding microdisk optical filter subunit in the optical path; m is a positive integer greater than 1;
and the output optical waveguide is used for outputting the filtered optical signal.
3. The optical filter of claim 1, wherein each stage of the microdisk optical filter has a periodic download spectrum at a resonant wavelength;
the microdisk resonator is arranged on one side of the straight waveguide and is used for filtering the optical signal wave band meeting the microdisk resonance condition in the straight waveguide from the spectrum.
4. The optical filter according to claim 1, wherein the switching of the states of the optical switching cells is achieved by thermo-optical effect or electro-optical effect.
5. The optical filter according to claim 3, wherein the optical switch unit and/or the microdisk optical filter are made of a material including lithium niobate, silicon dioxide, indium phosphide, or gallium arsenide.
6. The optical filter according to any one of claims 1 to 5, wherein the optical switch unit employs a directional coupling type optical switch or an MZ type optical switch.
7. An optical communication apparatus for optical filtering using the optical filter according to any one of claims 1 to 6.
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| CN110824730A (en) * | 2019-11-21 | 2020-02-21 | 中国科学院半导体研究所 | Narrow-band optical filter |
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| CN113031163A (en) * | 2021-03-15 | 2021-06-25 | 中国科学院半导体研究所 | Optical filter structure and optical filter |
| CN113031162A (en) * | 2021-03-15 | 2021-06-25 | 中国科学院半导体研究所 | Optical filter |
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| US7801446B2 (en) * | 2002-06-14 | 2010-09-21 | Infinera Corporation | Wavelength division multiplexed optical communication system with rapidly-tunable optical filters |
| US7065276B2 (en) * | 2003-04-03 | 2006-06-20 | Lambda Crossing Ltd. | Integrated optical filters utilizing resonators |
| US7587144B2 (en) * | 2004-01-12 | 2009-09-08 | Oewaves, Inc. | Tunable radio frequency and microwave photonic filters |
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| CN110824730A (en) * | 2019-11-21 | 2020-02-21 | 中国科学院半导体研究所 | Narrow-band optical filter |
| CN110927885A (en) * | 2019-11-29 | 2020-03-27 | 中国科学院半导体研究所 | Narrow-band optical filter based on microdisc resonator |
| CN111025465A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院半导体研究所 | Free spectral range tunable optical filter |
| CN113031163A (en) * | 2021-03-15 | 2021-06-25 | 中国科学院半导体研究所 | Optical filter structure and optical filter |
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