CN112630892A - Four-channel coarse wavelength division multiplexer based on non-equal-arm wide Mach-Zehnder interferometer - Google Patents
Four-channel coarse wavelength division multiplexer based on non-equal-arm wide Mach-Zehnder interferometer Download PDFInfo
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- CN112630892A CN112630892A CN202011542105.1A CN202011542105A CN112630892A CN 112630892 A CN112630892 A CN 112630892A CN 202011542105 A CN202011542105 A CN 202011542105A CN 112630892 A CN112630892 A CN 112630892A
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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
- G02B6/29346—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 wave or beam interference
- G02B6/2935—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means
- G02B6/29352—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means in a light guide
- G02B6/29355—Cascade arrangement of interferometers
Abstract
The present disclosure provides a four-channel coarse wavelength division multiplexer based on a non-equal arm wide mach-zehnder interferometer, comprising: the two output ends of the first Mach-Zehnder interferometer are respectively connected with the input end of the second Mach-Zehnder interferometer and the input end of the third Mach-Zehnder interferometer through a connecting waveguide to form a two-stage filter cascade structure, wherein the first Mach-Zehnder interferometer, the second Mach-Zehnder interferometer and the third Mach-Zehnder interferometer respectively comprise an optical splitter, a phase shift waveguide and a beam combiner, and the optical splitter is used for uniformly splitting an input light beam in a ratio of 50: 50 to obtain two light beams; the phase shift waveguide is used for outputting two paths of light with specific phase wavelengths by phase interference of the light with different wavelengths in the two paths of light beams; the beam combiner is used for combining two paths of light with specific phase wavelengths and respectively outputting the light to the connecting waveguide.
Description
Technical Field
The disclosure relates to the technical field of optical fiber communication and integrated optics, in particular to a four-channel coarse wavelength division multiplexer based on an unequal-arm wide Mach-Zehnder interferometer.
Background
With the development of network and communication technologies, the demand of people for information volume has increased explosively. Conventional electrical communication has failed to meet the demand of people, and optical communication is leading the trend of the communication field. Wavelength Division Multiplexing (WDM) technology is a key technology in an optical communication system, and is one of core contents for improving the communication capacity of an optical network at present. The coarse wavelength division multiplexing technology with 20nm channel spacing is widely applied to various short-distance interconnections.
Filters based on a cascaded Mach-Zehnder interferometer (MZI) architecture are a common type of wavelength division multiplexer. Compared with Arrayed Waveguide Grating (AWG), Waveguide Bragg Grating (Waveguide Bragg Grating) and other schemes, the cascaded mach-zehnder interferometer has lower crosstalk and loss and smaller device size. However, most of the conventional cascaded mach zehnder devices have unequal arm lengths, and the loss of the device is increased by the large number of waveguide bends. Meanwhile, the process tolerance of the structure is poor, and the response spectral line of the device is greatly shifted due to small change of the waveguide width.
Disclosure of Invention
In order to solve the above problems in the prior art, the present disclosure provides a four-channel coarse wavelength division multiplexer based on an unequal arm width mach-zehnder interferometer, which adopts an unequal arm width phase shift waveguide design, and reduces loss and increases process tolerance because the overall length of the phase shift waveguide is shortened and a curved waveguide is not included.
The present disclosure provides a four-channel coarse wavelength division multiplexer based on a non-equal arm wide mach-zehnder interferometer, comprising: the two output ends of the first Mach-Zehnder interferometer are respectively connected with the input end of the second Mach-Zehnder interferometer and the input end of the third Mach-Zehnder interferometer through a connecting waveguide to form a two-stage filter cascade structure, wherein the first Mach-Zehnder interferometer, the second Mach-Zehnder interferometer and the third Mach-Zehnder interferometer respectively comprise an optical splitter, a phase shift waveguide and a beam combiner, and the optical splitter is used for performing 50: 50, splitting light uniformly to obtain two paths of light beams; the phase shift waveguide is used for outputting two paths of light with specific phase wavelengths by phase interference of the light with different wavelengths in the two paths of light beams; the beam combiner is used for combining two paths of light with specific phase wavelengths and respectively outputting the light to the connecting waveguide.
Furthermore, the beam splitter and the beam combiner are both 2 × 2 multimode interference couplers, each 2 × 2 multimode interference coupler comprises two input tapered waveguides, a coupling region waveguide and two output tapered waveguides, and the two input tapered waveguides and the two output tapered waveguides are respectively and symmetrically connected with two ends of the coupling region waveguide.
Further, the phase shift waveguide comprises a first phase shift waveguide and a second phase shift waveguide, the first phase shift waveguide comprises a first tapered waveguide, a second tapered waveguide, a wide strip-shaped straight waveguide, a third tapered waveguide and a fourth tapered waveguide which are sequentially connected end to end, and the second phase shift waveguide comprises a first tapered waveguide, a second tapered waveguide, a third tapered waveguide, a narrow strip-shaped straight waveguide and a fourth tapered waveguide which are sequentially connected end to end.
Further, the length of the wide strip-shaped straight waveguide is equal to that of the narrow strip-shaped straight waveguide, and the width of the wide strip-shaped straight waveguide is larger than that of the narrow strip-shaped straight waveguide.
Furthermore, the second tapered waveguide and the third tapered waveguide are in an isosceles trapezoid structure, the width of the upper opposite side of the isosceles trapezoid structure is equal to that of the narrow strip-shaped straight waveguide, and the width of the lower opposite side of the isosceles trapezoid structure is equal to that of the wide strip-shaped straight waveguide.
Furthermore, the first tapered waveguide and the fourth tapered waveguide are parallelogram-like, and the side length of the narrow opposite side of the parallelogram-like is equal to the width of the strip-shaped straight waveguide.
Furthermore, the connecting waveguide is composed of two curved waveguides and a straight waveguide, the two curved waveguides are respectively connected with the straight waveguide to form an S-like shape, wherein the length and the width of the straight waveguide are respectively equal to the radius and the width of the curved waveguide.
Further, the first mach-zehnder interferometer, the second mach-zehnder interferometer, and the third mach-zehnder interferometer are formed of lithium niobate, silicon dioxide, indium phosphide, or a gallium arsenide material.
Compared with the prior art, the method has the following technical benefits:
(1) the four-channel coarse wavelength division multiplexer based on the unequal-arm wide Mach-Zehnder interferometer is insensitive to wavelength and can keep basically unchanged splitting ratio in a wide spectrum range, so that crosstalk of output signals is effectively reduced.
(2) The multi-mode interference coupler is adopted as the optical splitter, so that the processing tolerance of the optical splitter can be effectively improved.
(3) According to the four-channel coarse wavelength division multiplexer based on the unequal-arm-width Mach-Zehnder interferometer, the overall length of the phase shift waveguide is shortened, the bent waveguide is not contained, the loss is reduced, and the process tolerance is increased; the use of wide strip-shaped straight waveguides as phase shifting waveguides helps to increase process tolerances.
(4) The four-channel coarse wavelength division multiplexer based on the unequal-arm wide Mach-Zehnder interferometer only adopts the three Mach-Zehnder interferometer structures, and is simple in structure, low in loss, small in size and small in adjusting and controlling difficulty.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic structural diagram of a four-channel coarse wavelength division multiplexer based on an unequal arm width Mach-Zehnder interferometer according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates a structural schematic of a Mach-Zehnder interferometer according to one embodiment of the present disclosure;
FIG. 3 schematically illustrates a structural schematic of a multimode interference coupler according to an embodiment of the disclosure;
FIG. 4 schematically illustrates a structural schematic of a phase shifting waveguide according to an embodiment of the present disclosure;
fig. 5 schematically illustrates a simulated spectral diagram of a four-channel coarse wavelength division multiplexer based on an unequal arm width mach-zehnder interferometer in an operating state according to an embodiment of the disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Fig. 1 schematically illustrates a structural schematic diagram of a four-channel coarse wavelength division multiplexer based on an unequal arm width mach-zehnder interferometer according to an embodiment of the present disclosure.
As shown in fig. 1, the present disclosure provides a four-channel coarse wavelength division multiplexer based on an unequal arm width mach-zehnder interferometer, comprising: the two output ends of the first Mach-Zehnder interferometer are respectively connected with the input end of the second Mach-Zehnder interferometer and the input end of the third Mach-Zehnder interferometer through a connecting waveguide 4 to form a two-stage filter cascade structure. As shown in fig. 2, each of the first mach-zehnder interferometer 1, the second mach-zehnder interferometer 2, and the third mach-zehnder interferometer 3 includes an optical splitter 10, a phase-shift waveguide 20, and a beam combiner 30, where the optical splitter 10 is configured to perform a phase shift of an input light beam by a factor of 50: 50, splitting light uniformly to obtain two paths of light beams; the phase shift waveguide 20 is configured to output two paths of light with specific phase wavelengths by phase interference from the two paths of light with different wavelengths; the beam combiner 30 is configured to combine two paths of light with specific phase wavelengths, and output the combined light to the optical splitter of the next-stage mach-zehnder interferometer respectively.
According to the embodiment of the present disclosure, as shown in fig. 3, the optical splitter 10 and the beam combiner 30 are both 2 × 2 multimode interference couplers, each 2 × 2 multimode interference coupler includes two input tapered waveguides 101, a coupling region waveguide 102, and two output tapered waveguides 103, and the two input tapered waveguides 101 and the two output tapered waveguides (103) are respectively connected to two ends of the coupling region waveguide (102) symmetrically. In the embodiment of the present disclosure, two input tapered waveguides 101 and two output tapered waveguides 103 are respectively located at the one-third wide position and the two-thirds wide position of two side edges of the coupling region waveguide (102), one narrow end and the bottom of the two input tapered waveguides 101 and the two output tapered waveguides 103 are respectively connected to the connecting waveguide 4, the width of the two input tapered waveguides is equal to the width of the connecting waveguide 4, and one wide end and the bottom of the two input tapered waveguides are respectively connected to the coupling region waveguide 102.
According to the embodiment of the present disclosure, as shown in fig. 4, the phase shift waveguide 20 includes a first phase shift waveguide 210 and a second phase shift waveguide 220, the first phase shift waveguide 210 includes a first tapered waveguide 201, a second tapered waveguide 202, a wide strip-shaped straight waveguide 204, a third tapered waveguide 203 and a fourth tapered waveguide 206 which are sequentially connected end to end, and the second phase shift waveguide 220 includes a first tapered waveguide 201, a second tapered waveguide 202, a third tapered waveguide 203, a narrow strip-shaped straight waveguide 205 and a fourth tapered waveguide 206 which are sequentially connected end to end.
The first tapered waveguide 201 and the fourth tapered waveguide 206 have the same shape parameters and are parallelogram-like, the side length of the narrow opposite side is equal to the width of the narrow straight waveguide 205, and the first tapered waveguide 201 and the fourth tapered waveguide 206 are oppositely arranged in reverse to increase the distance between the two phase-shifted waveguides and avoid optical coupling when the two phase-shifted waveguides are too close to each other. The second tapered waveguide 202 and the third tapered waveguide 203 have the same shape parameters and are both isosceles trapezoid structures, the width of the upper opposite edge of each isosceles trapezoid structure is equal to that of the narrow strip-shaped straight waveguide 205, the width of the lower opposite edge of each isosceles trapezoid structure is equal to that of the wide strip-shaped straight waveguide 204, and the internal stagger angle of the bottom edge of each isosceles trapezoid structure is preferably 60-90 degrees; in the embodiment of the present disclosure, the second tapered waveguide 202 is a transition region where the narrow straight waveguide is changed into the wide straight waveguide, and the third tapered waveguide 203 is a transition region where the wide straight waveguide is changed into the narrow straight waveguide, so that the second tapered waveguide 202 and the third tapered waveguide 203 are also arranged oppositely, and the second tapered waveguide 202 is added to the second phase-shift waveguide 220 to offset the phase difference between the second tapered waveguide 202 and the third tapered waveguide 203. The length of the wide-strip-shaped straight waveguide 204 is equal to that of the narrow-strip-shaped straight waveguide 205, and the width of the wide-strip-shaped straight waveguide 204 is larger than that of the narrow-strip-shaped straight waveguide 205. In the embodiment of the present disclosure, the lengths of the wide-stripe straight waveguide 204 and the narrow-stripe straight waveguide 205 are preferably 40 μm to 105 μm, the width of the wide-stripe straight waveguide 204 is preferably 950nm to 1050nm, and the width of the narrow-stripe straight waveguide 205 is preferably 350nm to 450 nm.
In the embodiment of the present disclosure, setting the width of the wide strip-shaped straight waveguide 204 to be larger may increase the process tolerance, but an excessively large width may require longer second tapered waveguide 202 and third tapered waveguide 203, and may increase the length of the entire waveguide, which may result in an increase in device loss, an increase in large size of the device, and a deterioration in process tolerance; the width of the narrow strip-shaped straight waveguide is not suitable to be set too large, the waveguide length is increased due to the fact that the width of the narrow strip-shaped straight waveguide is too large, error accumulation is increased, and process tolerance is deteriorated. Therefore, in the embodiments of the present disclosure, the dimensions of the wide strip-shaped straight waveguide 204 and the narrow strip-shaped straight waveguide 205 are preferably the dimensions described in the embodiments of the present disclosure, considering the size of the whole device, the device loss, the process tolerance, and the like. The difference between the widths of the wide straight waveguide 204 and the narrow straight waveguide 205 causes the difference between the refractive indexes of the light transmitted in the wavelength, and the lengths of the wide straight waveguide 204 and the narrow straight waveguide 205 are designed to make the interference effect of the light transmitted in the wavelength different, so that the wavelength of the light output after the wide straight waveguide 204 and the narrow straight waveguide 205 act is the wavelength of the light at a specific interval.
According to the embodiment of the present disclosure, the connecting waveguide 4 is composed of two curved waveguides and a straight strip waveguide, the two curved waveguides are respectively connected with the straight strip waveguide to form an S-like shape, that is, the two curved waveguides are oppositely and reversely arranged, wherein the length and the width of the straight strip waveguide are respectively equal to the radius and the width of the curved waveguide, and the width of the curved waveguide is equal to the widths of the input tapered waveguide 101 and the output tapered waveguide 103. In the embodiment of the disclosure, the bending radius of the two curved waveguides is preferably 30 μm to 80 μm, the width is preferably 350nm to 450nm, and the bending angle is 90 °, and the curved waveguides in the range can avoid generating multimode loss and reduce optical transmission loss.
According to an embodiment of the present disclosure, the first mach-zehnder interferometer 1, the second mach-zehnder interferometer 2, and the third mach-zehnder interferometer 3 are composed of lithium niobate, silicon dioxide, indium phosphide, or a gallium arsenide material. In practical applications, the mach-zehnder interferometer made of semiconductor materials shown in the embodiments of the present disclosure is not limited.
According to the embodiment of the present disclosure, in the first mach-zehnder interferometer 1, the two input tapered waveguides 101 of the optical splitter 10 are respectively connected to the input waveguides, the two output tapered waveguides 103 thereof are respectively connected to the first tapered waveguide 201 of the first phase shift waveguide 210 and the first tapered waveguide 201 of the second phase shift waveguide 220, the fourth tapered waveguide 206 of the first phase shift waveguide 210 and the fourth tapered waveguide 206 of the second phase shift waveguide 220 are respectively connected to the two input tapered waveguides of the beam combiner 30, and the two output tapered waveguides of the beam combiner 30 are respectively connected to the connection waveguide 4. Similarly, the waveguide connections of the second mach-zehnder interferometer 2 and the third mach-zehnder interferometer 3 are the same as those of the first mach-zehnder interferometer 1.
The principle of the disclosed embodiments to achieve wavelength interference tuning is described in detail below with reference to a specific embodiment. Specifically, the width of the wide straight waveguide 204 is 1000nm, the width of the narrow straight waveguide 205 is 400nm, the internal stagger angle of the narrow sides of the second tapered waveguide 202 and the third tapered waveguide 203 is 60 °, the lengths of the wide straight waveguide and the narrow straight waveguide of the first mach-zehnder interferometer 1 are both 98.65 μm, the lengths of the wide straight waveguide and the narrow straight waveguide of the second mach-zehnder interferometer 2 are both 48.39 μm, and the lengths of the wide straight waveguide and the narrow straight waveguide of the third mach-zehnder interferometer 3 are both 49.33 μm. Wherein, a broad spectrum optical signal is input into the first mach-zehnder interferometer 1 from the input waveguide, the wavelength range of the broad spectrum optical signal is 1250nm to 1350nm, and the broad spectrum light is processed by 50: 50, obtaining two paths of wide spectrum light, the two paths of wide spectrum light are respectively input into a first phase shift waveguide 210 and a second phase shift waveguide 220, due to the refractive index difference caused by the different widths of the first phase shift waveguide 210 and the second phase shift waveguide 220, the light with different wavelengths in the two paths of wide spectrum light respectively outputs the wide spectrum light with specific phase wavelength through phase interference through the first phase shift waveguide 210 and the second phase shift waveguide 220, the light with the specific phase wavelength is interfered through a beam combiner 30, wherein the wavelength satisfying the interference wavelength condition is enhanced, the wavelength suppression satisfying the interference cancellation condition is satisfied, after the interference action of the beam combiner 30, the light with the wavelength of 1270nm and 1310nm in the input wide spectrum light is output to a connecting waveguide 4 through an output tapered waveguide 103 of the beam combiner 30 and is output to a second Mach-Zehnder interferometer 2 through the connecting waveguide 4, the light with the wavelength of 1290nm and 1330nm in the input wide spectrum light is output to the connecting waveguide 103 of the connecting tapered waveguide 30 A waveguide 4, and is output to the third mach-zehnder interferometer 3 by the connection waveguide 4; similarly, after the two paths of light have undergone the same interference action as that of the first mach-zehnder interferometer 1 in the second mach-zehnder interferometer 2 and the third mach-zehnder interferometer 3, the wavelengths of light of 1270nm and 1310nm are output from the output tapered waveguide of the second mach-zehnder interferometer 2, and the wavelengths of light of 1290nm and 1330nm are output from the output tapered waveguide of the third mach-zehnder interferometer 3, respectively. Since the optical splitter 10 is a 2 × 2 multimode interference coupler, the splitting ratio thereof is substantially constant in a wide spectral range, so that the respective output optical signals have low loss and crosstalk at the same time. Fig. 5 shows a simulated spectrum diagram of the four-channel coarse wavelength division multiplexer in the specific structure in the operating state, and as shown in fig. 5, the loss of the four-channel coarse wavelength division multiplexer in the specific structure is about-0.5 dB to 1dB, and the crosstalk is about-30 dB.
In some embodiments of the present disclosure, the width of the wide straight waveguide 204 is 1000nm, the width of the narrow straight waveguide 205 is 400nm, the internal stagger angle of the narrow sides of the second tapered waveguide 202 and the third tapered waveguide 203 is 60 °, the lengths of the wide straight waveguide and the narrow straight waveguide of the first mach-zehnder interferometer 1 are 129.65 μm, the lengths of the wide straight waveguide and the narrow straight waveguide of the second mach-zehnder interferometer 2 are 63.9 μm, the lengths of the wide straight waveguide and the narrow straight waveguide of the third mach-zehnder interferometer 3 are 64.83 μm, the wavelength interval of the output of the phase-shift waveguide 20 is 15nm, that is, the light having a wavelength of 1310nm as the center wavelength, wherein the wavelengths of 1280nm and 1310nm are outputted from the output tapered waveguide of the second Mach-Zehnder interferometer 2, and the wavelengths of 1295nm and 1325nm are outputted from the output tapered waveguide of the third Mach-Zehnder interferometer 3. The width of the wide straight waveguide 204 is 1000nm, the width of the narrow straight waveguide 205 is 400nm, the inner staggered angle of the narrow sides of the second tapered waveguide 202 and the third tapered waveguide 203 is 60 °, the lengths of the wide straight waveguide and the narrow straight waveguide of the first mach-zehnder interferometer 1 are both 74.85 μm, the lengths of the wide straight waveguide and the narrow straight waveguide of the second mach-zehnder interferometer 2 are both 38.3 μm, the lengths of the wide straight waveguide and the narrow straight waveguide of the third mach-zehnder interferometer 3 are both 37.43 μm, the output wavelength interval is 25nm, namely, the light with the wavelength of 1310nm as the central wavelength, wherein the wavelengths of 1260nm and 1310nm are respectively output from the output tapered waveguide of the second mach-zehnder interferometer 2, and the wavelengths of 1285nm and 1335nm are respectively output from the output tapered waveguide of the third mach-zehnder interferometer 3.
It should be noted that the length and width dimensions of the wide-stripe straight waveguide 204 and the narrow-stripe straight waveguide 205 of the present disclosure are set according to practical requirements, and are not limited to the dimensions listed in the embodiments of the present application. In addition, the specific structure provided in the above embodiments does not constitute a limitation to the present application, and the number, shape, and size of the mach-zehnder interferometers in the coarse wavelength division multiplexer may be modified depending on the actual situation.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
While the disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Accordingly, the scope of the present disclosure should not be limited to the above-described embodiments, but should be defined not only by the appended claims, but also by equivalents thereof.
Claims (8)
1. A four-channel coarse wavelength division multiplexer based on a non-equal arm width Mach-Zehnder interferometer, comprising: a first Mach-Zehnder interferometer (1), a second Mach-Zehnder interferometer (2), and a third Mach-Zehnder interferometer (3), two output ends of the first Mach-Zehnder interferometer being connected to an input end of the second Mach-Zehnder interferometer and an input end of the third Mach-Zehnder interferometer, respectively, via a connecting waveguide (4) to form a two-stage filter cascade structure, wherein,
the first Mach-Zehnder interferometer (1), the second Mach-Zehnder interferometer (2), and the third Mach-Zehnder interferometer (3) each include an optical splitter (10), a phase-shift waveguide (20), and a beam combiner (30), wherein the optical splitter (10) is configured to perform a phase shift of an input light beam by 50: 50, splitting light uniformly to obtain two paths of light beams; the phase shift waveguide (20) is used for outputting two paths of light with specific phase wavelengths by phase interference of the light with different wavelengths in the two paths of light beams; the beam combiner (30) is used for combining the two paths of light with specific phase wavelengths and outputting the light to the connecting waveguide (4) respectively.
2. The four-channel coarse wavelength division multiplexer based on the unequal-arm-width Mach-Zehnder interferometer according to claim 1, wherein the optical splitter (10) and the beam combiner (30) are both 2 x 2 multimode interference couplers, each 2 x 2 multimode interference coupler comprises two input tapered waveguides (101), a coupling region waveguide (102) and two output tapered waveguides (103), and the two input tapered waveguides (101) and the two output tapered waveguides (103) are respectively and symmetrically connected with two ends of the coupling region waveguide (102).
3. The four-channel coarse wavelength division multiplexer based on the unequal-arm-width Mach-Zehnder interferometer according to claim 1, wherein the phase shift waveguide (20) comprises a first phase shift waveguide (210) and a second phase shift waveguide (220), the first phase shift waveguide (210) comprises a first tapered waveguide (201), a second tapered waveguide (202), a wide-strip straight waveguide (204), a third tapered waveguide (203) and a fourth tapered waveguide (206) which are sequentially connected end to end, and the second phase shift waveguide (220) comprises a first tapered waveguide (201), a second tapered waveguide (202), a third tapered waveguide (203), a narrow-strip straight waveguide (205) and a fourth tapered waveguide (206) which are sequentially connected end to end.
4. The four-channel coarse wavelength division multiplexer based on non-equal arm wide mach-zehnder interferometer according to claim 3, characterized in that the length of the wide strip-shaped straight waveguide (204) is equal to the length of the narrow strip-shaped straight waveguide (205), the width of the wide strip-shaped straight waveguide (204) being larger than the width of the narrow strip-shaped straight waveguide (205).
5. The four-channel coarse wavelength division multiplexer based on non-equal arm width Mach-Zehnder interferometer according to claim 3, characterized in that the second tapered waveguide (202) and the third tapered waveguide (203) are in an isosceles trapezoid structure, the width of the upper opposite side is equal to the width of the narrow strip-shaped straight waveguide (205), and the width of the lower opposite side is equal to the width of the wide strip-shaped straight waveguide (204).
6. The four-channel coarse wavelength division multiplexer based on non-equal arm width mach-zehnder interferometer according to claim 3, characterized in that the first tapered waveguide (201) and the fourth tapered waveguide (206) are parallelogram-like with side length of narrow opposite side equal to the width of the narrow strip-shaped straight waveguide (205).
7. The four-channel coarse wavelength division multiplexer based on the non-equal arm width mach-zehnder interferometer according to claim 1, characterized in that the connecting waveguide (4) is composed of two curved waveguides and a straight strip waveguide, the two curved waveguides are respectively connected with the straight strip waveguide to form an S-like shape, wherein the length and the width of the straight strip waveguide are respectively equal to the radius and the width of the curved waveguides.
8. The four-channel coarse wavelength division multiplexer based on non-equal arm wide mach-zehnder interferometers according to claim 1, characterized in that the first mach-zehnder interferometer (1), the second mach-zehnder interferometer (2) and the third mach-zehnder interferometer (3) are composed of lithium niobate, silicon dioxide, indium phosphide or gallium arsenide material.
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| CN114296178A (en) * | 2021-12-31 | 2022-04-08 | 武汉光谷信息光电子创新中心有限公司 | Interference device |
| CN114815325A (en) * | 2022-06-29 | 2022-07-29 | 浙江大学 | Micro-ring auxiliary MZI optical switch based on thermo-optical modulation |
| CN114924357A (en) * | 2022-03-29 | 2022-08-19 | 中国电子科技集团公司第五十四研究所 | Wavelength division multiplexing optical delay line based on cascade Mach-Zehnder interferometer structure |
| CN117348162A (en) * | 2023-10-08 | 2024-01-05 | 广州铌奥光电子有限公司 | Multichannel wavelength division multiplexer based on Mach-Zehnder interferometer |
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| CN114924357B (en) * | 2022-03-29 | 2024-03-12 | 中国电子科技集团公司第五十四研究所 | Wavelength division multiplexing optical delay line based on cascade Mach-Zehnder interferometer structure |
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