CN110673266B - Narrow-band optical filter based on high-order micro-ring resonator - Google Patents
Narrow-band optical filter based on high-order micro-ring resonator Download PDFInfo
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- CN110673266B CN110673266B CN201910990990.0A CN201910990990A CN110673266B CN 110673266 B CN110673266 B CN 110673266B CN 201910990990 A CN201910990990 A CN 201910990990A CN 110673266 B CN110673266 B CN 110673266B
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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
Abstract
A narrow-band optical filter based on a high-order micro-ring resonator, an optical element and application, wherein the narrow-band optical filter comprises an input optical waveguide and a filter, wherein the input optical waveguide is used for inputting a wide-band optical signal to be processed; the high-order micro-ring optical filter unit is used for filtering a broadband optical signal input into the optical waveguide; and an output optical waveguide for outputting the filtered broadband optical signal. The invention provides an integrated optical filter structure based on a high-order micro-ring resonator, which is used for realizing the filtering functions of high roll-off rate, narrow bandwidth and low loss, and further meeting the requirements of the technical field of optical fiber communication on an optical filter with high roll-off rate and narrow bandwidth.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a high-order micro-ring resonator-based narrow-band optical filter.
Background
Photons have great advantages as information carriers, such as mutual interference resistance, large transmission bandwidth, high speed, electromagnetic interference resistance and the like, and are widely applied to the technical field of long-distance optical fiber communication. The optical filter is crucial to routing in Wavelength Division Multiplexing (WDM) network applications, and can select signals of different frequencies by using the optical filter to realize functions such as demultiplexing. Compared with the traditional electronic technology, the microwave signal with high frequency bandwidth can be directly filtered, and the method has great significance in the high-level application aspects of broadband access, quantum communication, laser radar and astronomical systems. The selectivity of the target frequency band is an important index of an optical filter applied to microwave photon signal processing, which requires that the optical filter has a high roll-off rate and a narrower passband bandwidth, and the smaller the proportion of the passband bandwidth in a free spectral region, the stronger the selectivity. The optical filter based on integrated photonics is convenient for large-scale integration, and meanwhile, a mature semiconductor process processing platform is utilized, so that large-scale low-cost mass production can be realized. Common high roll-off rate narrowband optical filters often adopt structures such as Fiber Bragg Gratings (FBGs) and Mach-Zehnder (MZ, Mach-Zehnder), but the above schemes have the problems of large loss, large volume, high cost, poor stability, difficult adjustment and control and the like.
Disclosure of Invention
In view of the above, it is a primary object of the present invention to provide a high-order narrow-band optical filter based on micro-ring resonator, an optical element and an application thereof, so as to at least partially solve at least one of the above technical problems.
In order to achieve the above object, as one aspect of the present invention, there is provided a high-order microring resonator-based narrow-band optical filter, comprising:
the input optical waveguide is used for inputting a broadband optical signal to be processed;
the high-order micro-ring optical filter unit is used for filtering a broadband optical signal input into the optical waveguide; and
and the output optical waveguide is used for outputting the filtered broadband optical signal.
As another aspect of the present invention, there is also provided an optical element incorporating the narrow band optical filter as described above.
As a further aspect of the present invention, there is also provided a use of the narrow band optical filter as described above or the optical element as described above in the field of optical fiber communication technology.
Based on the technical scheme, compared with the prior art, the high-order microring resonator-based narrow-band optical filter, the optical element and the application have at least one of the following advantages:
the invention provides an integrated optical filter structure based on a high-order micro-ring resonator, which is used for realizing the filtering functions of high roll-off rate, narrow bandwidth and low loss, and further meeting the requirements of the technical field of optical fiber communication on an optical filter with high roll-off rate and narrow bandwidth.
Drawings
To further illustrate the technical content of the present invention, the following detailed description is further provided in conjunction with the embodiments and the accompanying drawings, wherein:
fig. 1 is a schematic structural diagram of a narrow-band optical filter under a high-order micro-ring resonator using an odd number of micro-ring cascades according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a narrow-band optical filter under a high-order micro-ring resonator adopting an even number of micro-ring cascades in an embodiment of the present invention;
FIG. 3A is a schematic structural diagram of a lower high-order microring optical filter with odd and even numbers of microrings cascaded according to an embodiment of the present invention;
fig. 3B is a spectrum diagram of the download end and the through end of the odd-numbered or even-numbered micro-ring cascaded lower high-order micro-ring optical filter according to an embodiment of the present invention;
fig. 4 is a combined filtering curve diagram of the download end and the through end of the first-stage micro-ring optical filter and the second-stage micro-ring optical filter in the working state of the narrow-band optical filter under the high-order micro-ring resonator adopting odd number of micro-ring cascades in the embodiment of the present invention;
fig. 5 is a combined filtering curve diagram of the download end and the through end of the first-stage micro-ring optical filter and the second-stage micro-ring optical filter in the working state of the narrow-band optical filter under the high-order micro-ring resonator adopting even number of micro-ring cascades in the embodiment of the present invention;
fig. 6 is a schematic diagram of a filtering curve of each stage in a working state of the narrow-band optical filter according to an embodiment of the present invention, in which (a) is a combined filtering curve graph of a first-stage high-order micro-ring optical filter and a second-stage high-order micro-ring optical filter; (b) the figure is a filtering curve of a third-stage high-order micro-ring optical filter; (c) the figure shows the output end filtering curve of the integrated optical filter formed by cascading the three-stage high-order micro-ring optical filters.
Description of reference numerals:
100-input optical waveguide
200-high order micro-ring optical filter unit
201-first order optical filter 202-second order optical filter
203-third order optical filter
300-intermediate optical waveguide unit
301-first intermediate optical waveguide 302-second intermediate optical waveguide
303-third intermediate optical waveguide
400-output optical waveguide
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The basic unit of the invention is a high-order micro-ring resonator structure, compared with a single-ring micro-ring resonator, the invention has obvious advantages in the aspects of expanding bandwidth, improving the roll-off speed of a side band and the like, and can enable a filtering spectrum line to have better flat-top characteristic and higher roll-off speed, thereby greatly improving the filtering characteristic of a filter.
The invention discloses a narrow-band optical filter based on a high-order micro-ring resonator, which comprises:
the input optical waveguide is used for inputting a broadband optical signal to be processed;
the high-order micro-ring optical filter unit is used for filtering a broadband optical signal input into the optical waveguide; and
and the output optical waveguide is used for outputting the filtered broadband optical signal.
The high-order micro-ring optical filter unit comprises a plurality of levels of high-order micro-ring optical filters and an intermediate optical waveguide unit;
each stage of the high-order micro-ring optical filter comprises:
an input straight waveguide;
an output straight waveguide; and
and the high-order micro-ring resonator is arranged between the input straight waveguide and the output straight waveguide and is used for coupling the wave band meeting the micro-ring resonance condition in the input straight waveguide into the output straight waveguide.
Wherein, the microring of each stage of the high-order microring resonator adopts a series structure;
the number of micro-rings of each stage of the high-order micro-ring resonator is the same;
the number of the microrings of each stage of the high-order microring resonator is at least two;
the distances between the micro-rings in the high-order micro-ring resonators of each stage of the high-order micro-ring resonators are equal;
and the distances between the high-order micro-ring resonator at each stage and the corresponding input straight waveguide and output straight waveguide are equal.
The high-order micro-ring optical filter unit comprises a first-stage high-order micro-ring optical filter, a second-stage high-order micro-ring optical filter and a third-stage high-order micro-ring optical filter;
the radius of a high-order micro-ring resonator of the first-stage high-order micro-ring optical filter, the radius of a second-stage high-order micro-ring optical filter and the radius of a high-order micro-ring resonator of the third-stage high-order micro-ring optical filter, the waveguide width of the high-order micro-ring resonator and the waveguide thickness of the high-order micro-ring resonator are the same;
the distances between the high-order micro-ring resonators of the first-stage high-order micro-ring optical filter and the second-stage high-order micro-ring optical filter and the input straight waveguide and the output straight waveguide are the same;
the distances between the high-order micro-ring resonator of the third-stage high-order micro-ring optical filter and the input straight waveguide and the output straight waveguide are respectively greater than the distances between the first-stage high-order micro-ring optical filter or the second-stage high-order micro-ring optical filter and the input straight waveguide and the output straight waveguide.
Wherein the intermediate optical waveguide comprises:
two ends of the first intermediate optical waveguide are respectively connected with an input straight waveguide through end of the first-stage high-order micro-ring optical filter and an upload end of an output straight waveguide of the second-stage high-order micro-ring optical filter;
the two ends of the second intermediate optical waveguide are respectively connected with the download end of the output straight waveguide of the first-stage high-order micro-ring optical filter and the input end of the input straight waveguide of the second-stage high-order micro-ring optical filter; and
the two ends of the third intermediate optical waveguide are respectively connected with the download end of the output straight waveguide of the second-stage high-order micro-ring optical filter and the input end of the input straight waveguide of the third-stage high-order micro-ring optical filter;
the sum of the lengths of the output straight waveguide of the first-stage high-order micro-ring optical filter, the second intermediate optical waveguide and the input straight waveguide of the second-stage high-order micro-ring optical filter is equal to the length of the first intermediate optical waveguide.
The tuning of the central wavelength of the narrow-band optical filter is realized by independently tuning the central wavelength of each filter curve of a plurality of levels of high-level micro-ring optical filters of the high-level micro-ring optical filter unit;
the high-order micro-ring optical filter is used for tuning the central wavelength of a filter curve of the high-order micro-ring optical filter through a thermo-optic effect or an electro-optic effect.
Wherein the narrow-band optical filter structure is a feed-forward structure.
The high-order micro-ring filter unit is manufactured on a lithium niobate, silicon dioxide, indium phosphide or gallium arsenide platform through a semiconductor process.
And when the number of the micro-rings in the high-order micro-ring optical filter unit is an odd number, the output direction of the broadband optical signal of the downloading end is different from that when the number of the micro-rings is an even number.
The invention also discloses an optical element which is internally provided with the narrow-band optical filter.
The invention also discloses an application of the narrow-band optical filter or the optical element in the technical field of optical fiber communication.
In an exemplary embodiment of the present invention, a high order microring resonator based narrowband optical filter comprises: the optical filter comprises an input optical waveguide, a high-order micro-ring optical filter unit, an intermediate optical waveguide unit and an output optical waveguide. Light conducted in the input waveguide is subjected to first filtering at a first-stage high-order micro-ring optical filter and is divided into a straight-through end and a download end; the second-stage high-order micro-ring optical filter is used for respectively carrying out second filtering on the optical paths of the through end and the download end after the first filtering; after the through end and the download end optical paths after the two times of filtering are combined, the side lobes of the spectrums obtained by the first stage and the second stage are filtered by a third-stage high-order micro-ring optical filter and then transmitted to an output optical waveguide. The narrow-band optical filter can obtain an output spectrum with low loss, narrow bandwidth and high roll-off rate.
In another exemplary embodiment of the present invention, a high order microring resonator based narrowband optical filter comprises:
an input optical waveguide 100 for inputting a broadband optical signal to be processed;
the high-order micro-ring optical filter unit 200 comprises a first-order high-order micro-ring optical filter 201, a second-order micro-ring optical filter 202 and a third-order micro-ring optical filter 203, wherein each high-order micro-ring optical filter consists of a high-order micro-ring resonator and two straight waveguides (an input straight waveguide and an output straight waveguide) close to the high-order micro-ring resonator, and is used for filtering broadband optical signals input into the two straight waveguides;
an intermediate optical waveguide unit 300 including a first intermediate optical waveguide 301, a second intermediate optical waveguide 302, and a third intermediate optical waveguide 303, for transmitting signal light between different high-order micro-ring optical filters;
the high-order micro-ring optical filter 200 and the intermediate optical waveguide 300 are arranged in a staggered manner, the input end of the first-order micro-ring optical filter 201 is connected with the input optical waveguide 100, the through end of the first-order micro-ring optical filter is connected with the intermediate optical waveguide 301, the download end of the first-order micro-ring optical filter is connected with the second intermediate optical waveguide 302, then the first intermediate optical waveguide 301 and the second intermediate optical waveguide 302 are respectively connected with two different sections of straight waveguides of the second-order micro-ring optical filter 202, the first intermediate optical waveguide 301 enters the download end corresponding to the second-order micro-ring optical filter 202 and the intermediate optical waveguide 302 enters the through end corresponding to the second-order micro-ring optical filter 202 and is the same port, the first intermediate optical waveguide 301 is connected with the third intermediate optical waveguide 303, and;
and the output optical waveguide 400 is used for outputting the signal light at the download end of the third-stage high-order micro-ring optical filter 203 to complete the filtering function of the integrated optical filter.
The microrings of the high-order microring resonator inside the high-order microring optical filter unit 200 are all in a series structure, and the number of the microrings included in the microring optical filter unit is the same, and is at least two.
The high-order micro-ring optical filter units 200 are all of a symmetrical structure, the distances between micro-rings in the high-order micro-ring resonators in each high-order micro-ring optical filter are equal, and the distances between the high-order micro-ring resonators and two surrounding straight waveguides are also equal.
The first-stage high-order optical filter 201 and the second-stage high-order optical filter 202 have the same design parameters, so that the two-stage high-order optical filters have the same flat-top filter curve shape and the same center wavelength.
The third-stage high-order micro-ring optical filter 203, the first-stage high-order micro-ring optical filter 201 and the second-stage high-order micro-ring optical filter 202 have design parameters which are not completely the same, the micro-ring radius, the waveguide width and the waveguide thickness of the micro-ring resonators in the third-stage high-order micro-ring optical filter 203 and the two straight waveguides are consistent, but the distance between the micro-ring resonators in the third-stage high-order micro-ring optical filter 203 and the two straight waveguides is larger than the distance between the micro-ring resonators in the first-stage micro-ring optical filter 201 and the two straight waveguides in the second-stage micro-ring optical filter 202 and the two straight waveguides, so that filtering spectrum lines with low loss, narrow bandwidth and high roll-off rate can be.
After the input light wave passes through the first-stage high-order micro-ring optical filter 201 and the second-stage high-order micro-ring optical filter 202, the through end and the download end respectively perform two identical filtering processes, and the result of the two filtering stacks generates a spectrum similar to an electromagnetically induced transparent spectrum, so that the extinction ratio of a filtering curve is increased by two times, and the roll-off rate of a spectral line is increased.
The lengths of the sum of the first intermediate optical waveguide 301 and the second intermediate optical waveguide 302, the output straight waveguide of the first-stage high-order micro-ring optical filter 201, and the input straight waveguide of the second-stage high-order micro-ring optical filter 202 are the same, so as to ensure that the phases of the filtering curves of the first-stage high-order micro-ring optical filter 201, the through end of the second-stage high-order micro-ring optical filter 202, and the download end do not shift.
Wherein, the structure is a feedforward structure, and a feedback loop does not exist inside the structure.
The central wavelength of the filter curves of the first-stage high-order micro-ring optical filter 201, the second-stage high-order micro-ring optical filter 202 and the third-stage high-order micro-ring optical filter 203 can be tuned independently, so that the central wavelength of the narrow-band optical filter can be tuned.
Optionally, the high-order micro-ring optical filter 200 unit tunes the central wavelength of the filtering curve thereof through a thermo-optical effect or an electro-optical effect.
Alternatively, the high-order micro-ring filter 200 unit may be fabricated on a platform of lithium niobate, silicon dioxide, indium phosphide, or gallium arsenide through a semiconductor process.
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
Referring to fig. 1 and fig. 2, the high-order micro-ring resonator based narrow-band optical filter of the present embodiment includes:
the optical waveguide 100 is used for inputting a broadband optical signal to be processed.
The high-order micro-ring optical filter unit 200 comprises a first-order high-order micro-ring optical filter 201, a second-order micro-ring optical filter 202 and a third-order micro-ring optical filter 203, wherein each high-order micro-ring optical filter consists of a high-order micro-ring resonator and two straight waveguides close to the high-order micro-ring resonator and is used for filtering a broadband optical signal input into the straight waveguides, after the optical signal enters a certain straight waveguide, a waveband meeting a high-order micro-ring resonance condition is coupled to a downloading end of another straight waveguide through a high-order micro-ring, and a waveband not meeting the high-order micro-ring resonance condition is reserved at a straight-through end of the original straight waveguide.
Fig. 3A is a schematic diagram of the structure of odd and even numbers of micro-ring cascaded lower high-order micro-ring optical filters, and fig. 3B is a spectral diagram of the download end and the through end of odd or even numbers of micro-ring cascaded lower high-order micro-ring optical filters, and the download end and the through end of odd or even numbers of micro-ring cascaded lower high-order micro-ring optical filters are the same in spectral diagram.
In the embodiment of the present invention, the high-order microring resonators in the high-order microring optical filter 200 unit all adopt a series structure, and the number of microrings included in the high-order microring resonators is the same, and is at least two; the distances between the micro-rings in the high-order micro-ring resonators in each high-order micro-ring optical filter are equal, and the distances between the high-order micro-ring resonators and the two sections of surrounding straight waveguides are also equal; the third-stage high-order micro-ring optical filter 203 has design parameters which are not completely the same as those of the first-stage high-order micro-ring optical filter 201 and the second-stage high-order micro-ring optical filter 202, the micro-ring radius, the waveguide width and the waveguide thickness of the micro-ring resonators in the third-stage high-order micro-ring optical filter 203 are consistent with those of the first-stage high-order micro-ring optical filter 201 and the second-stage high-order micro-ring optical filter 202, but the distance between the micro-ring resonators in the third-stage high-order micro-ring optical filter 203 and the two straight waveguides is larger than that between the micro.
The intermediate optical waveguide unit 300 includes a first intermediate optical waveguide 301, a second intermediate optical waveguide 302, and a third intermediate optical waveguide 303, and is configured to transmit signal light between different high-order micro-ring optical filters.
The high-order micro-ring optical filter 200 and the intermediate optical waveguide 300 are arranged in a staggered manner, the input end of the first-order micro-ring optical filter 201 is connected with the input optical waveguide 100, the through end of the first-order micro-ring optical filter is connected with the intermediate optical waveguide 301, the download end of the first-order micro-ring optical filter is connected with the intermediate optical waveguide 302, the intermediate optical waveguides 301 and 302 are respectively connected with two different sections of straight waveguides of the second-order micro-ring optical filter 202, the download end of the intermediate optical waveguide 301, which enters the second-order micro-ring optical filter 202, and the through end of the intermediate optical waveguide 302, which enters the second-order micro-ring optical filter 202, are the same port and are connected with the intermediate optical waveguide.
And the output optical waveguide 400 is used for outputting the signal light at the download end of the third-stage high-order micro-ring optical filter 203 to complete the filtering function of the integrated optical filter.
Specifically, as shown in fig. 4 and 5, a broadband optical signal to be processed enters an input end of a first-stage high-order micro-ring optical filter 201 by using an input optical waveguide 100 to realize first-stage filtering, a through end of the first-stage high-order micro-ring optical filter is connected to an intermediate optical waveguide 301, and a download end of the first-stage high-order micro-ring optical filter is connected to an intermediate optical waveguide 302;
then, the intermediate optical waveguides 301 and 302 are respectively connected with two different straight waveguides of the second-stage high-order micro-ring optical filter 202, the signal light in the intermediate optical waveguide 301 is output to the intermediate optical waveguide 303 through the corresponding straight end of the intermediate optical waveguide in the second-stage high-order micro-ring optical filter 202, the signal light in the intermediate optical waveguide 302 is also output to the intermediate optical waveguide 303 through the corresponding downloading end of the intermediate optical waveguide in the second-stage high-order micro-ring optical filter 202, and the two beams of light are combined in the intermediate optical waveguide 303, because the first-stage high-order micro-ring optical filter 201 and the second-stage high-order micro-ring optical filter 202 have completely consistent parameters, the two optical filters are ensured to have the same flat-top filtering curve shape and the same central wavelength, and simultaneously the sum of the first intermediate optical waveguide 301 and the second intermediate optical waveguide 302, the output straight waveguide of the first-stage high-order micro-ring optical filter 201 and the input straight waveguide of the, therefore, the broadband optical signal to be processed is subjected to two identical filtering processes at the through end and the download end respectively, and the two filtering processes are overlapped, so that after the light fields at the same wavelength are overlapped, the light fields are overlapped with the download peak of the second filtering spectrum at the depression of the first filtering spectrum, and a narrow peak in the filtering spectrum is positioned in the groove, and as a result, a spectrum similar to Electromagnetic Induced Transparency (EIT) as shown in (a) of fig. 6 is generated at the third intermediate optical waveguide 303. Compared with a single-ring micro-ring resonator, the band-pass filter has the remarkable advantages of expanding the bandwidth, improving the roll-off speed of the side band and the like, and can enable the filtering spectrum line to have better flat-top characteristic and higher roll-off speed, so that the filtering characteristic of the filter is greatly improved.
Finally, the signal light in the third intermediate optical waveguide 303 enters the third-stage high-order micro-ring optical filter 203, and since the filter curve of the third-stage high-order micro-ring optical filter 203 is shown in fig. 6 (b), the filtering result shown in fig. 6 (c) will be generated at the downstream end thereof and output through the output optical waveguide 400.
In summary, the embodiment of the invention obtains the filtering spectrum line with low loss, narrow bandwidth and high roll-off rate, and completes the filtering function of the integrated optical filter.
In the embodiment of the present disclosure, by independently tuning the center wavelengths of the filter curves of the first, second, and third high-order micro-ring optical filters 201, 202, and 203, the center wavelength of the narrow-band optical filter can be tunable.
In the embodiment of the present disclosure, the high-order micro-ring optical filter unit 200 tunes the center wavelength of the filter curve thereof through the thermo-optical effect or the electro-optical effect.
In the embodiment of the present disclosure, the high-order micro-ring filter unit 200 may be fabricated on a platform made of lithium niobate, silicon dioxide, indium phosphide, or gallium arsenide through a semiconductor process.
In a specific embodiment of the present disclosure, the structure is a feed-forward structure, with no feedback loop inside.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.
Claims (8)
1. A high-order microring resonator-based narrow-band optical filter, comprising:
the input optical waveguide is used for inputting a broadband optical signal to be processed;
the high-order micro-ring optical filter unit comprises a first-stage high-order micro-ring optical filter, a second-stage high-order micro-ring optical filter, a third-stage high-order micro-ring optical filter and an intermediate optical waveguide, and is used for filtering a broadband optical signal input into the optical waveguide; wherein each level of the high-order micro-ring optical filter comprises:
an input straight waveguide;
an output straight waveguide; and
the high-order micro-ring resonator is arranged between the input straight waveguide and the output straight waveguide and is used for coupling a wave band meeting a micro-ring resonance condition in the input straight waveguide into the output straight waveguide;
wherein the intermediate optical waveguide comprises:
two ends of the first intermediate optical waveguide are respectively connected with an input straight waveguide through end of the first-stage high-order micro-ring optical filter and an upload end of an output straight waveguide of the second-stage high-order micro-ring optical filter;
the two ends of the second intermediate optical waveguide are respectively connected with the download end of the output straight waveguide of the first-stage high-order micro-ring optical filter and the input end of the input straight waveguide of the second-stage high-order micro-ring optical filter; and
the two ends of the third intermediate optical waveguide are respectively connected with the download end of the output straight waveguide of the second-stage high-order micro-ring optical filter and the input end of the input straight waveguide of the third-stage high-order micro-ring optical filter;
the sum of the lengths of the output straight waveguide of the first-stage high-order micro-ring optical filter, the second intermediate optical waveguide and the input straight waveguide of the second-stage high-order micro-ring optical filter is equal to the length of the first intermediate optical waveguide; and
and the output optical waveguide is used for outputting the filtered broadband optical signal.
2. The narrow-band optical filter of claim 1,
the micro-rings of each level of high-order micro-ring resonator adopt a series structure;
the number of micro-rings of each level of high-order micro-ring resonators is the same;
the number of micro-rings of each level of high-order micro-ring resonator is at least two;
distances among micro rings in the high-order micro ring resonators of each level of high-order micro ring resonators are equal;
and the distances between each stage of high-order micro-ring resonator and the corresponding input straight waveguide and output straight waveguide are equal.
3. The narrow-band optical filter of claim 1,
the radius of a high-order micro-ring resonator of the first-stage high-order micro-ring optical filter, the radius of a second-stage high-order micro-ring optical filter and the radius of a high-order micro-ring resonator of the third-stage high-order micro-ring optical filter, the waveguide width of the high-order micro-ring resonator and the waveguide thickness of the high-order micro-ring resonator are the same;
the distances between the high-order micro-ring resonators of the first-stage high-order micro-ring optical filter and the second-stage high-order micro-ring optical filter and the input straight waveguide and the output straight waveguide are the same;
the distances between the high-order micro-ring resonator of the third-stage high-order micro-ring optical filter and the input straight waveguide and the output straight waveguide are respectively greater than the distances between the first-stage high-order micro-ring optical filter or the second-stage high-order micro-ring optical filter and the input straight waveguide and the output straight waveguide.
4. The narrow-band optical filter of claim 1,
the tuning of the central wavelength of the narrow-band optical filter is realized by independently tuning the central wavelength of each filter curve of a plurality of high-order micro-ring optical filters of the high-order micro-ring optical filter unit;
the high-order micro-ring optical filter is used for tuning the central wavelength of a filter curve of the high-order micro-ring optical filter through a thermo-optic effect or an electro-optic effect.
5. The narrow-band optical filter of claim 1,
the narrow-band optical filter structure is a feed-forward structure;
the high-order micro-ring filter unit is manufactured on a lithium niobate, silicon dioxide, indium phosphide or gallium arsenide platform through a semiconductor process.
6. The narrow-band optical filter of claim 1,
and the output direction of the broadband optical signal at the downloading end is different when the number of the micro-rings in the high-order micro-ring optical filter unit is an odd number and when the number of the micro-rings is an even number.
7. An optical element incorporating the narrow band optical filter according to any one of claims 1 to 6.
8. Use of a narrow band optical filter according to any of claims 1 to 6 or an optical component according to claim 7 in the field of optical fiber communication technology.
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