CN114488409A - Reconfigurable optical filter chip based on adjustable coupler cascade coupling resonance optical waveguide - Google Patents
Reconfigurable optical filter chip based on adjustable coupler cascade coupling resonance optical waveguide Download PDFInfo
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- 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
- G02B6/29301—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 based on a phased array of light guides
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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
- G02B6/29389—Bandpass filtering, e.g. 1x1 device rejecting or passing certain wavelengths
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- 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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- 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
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- 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
- G02F1/09—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 magneto-optical elements, e.g. exhibiting Faraday effect
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Abstract
The invention discloses a reconfigurable optical filter chip based on an adjustable coupler cascade coupling resonant optical waveguide, which comprises two optical input ports, an adjustable coupler 1, a phase shifter 2, a coupling resonant optical waveguide and two optical output ports. The adjustable coupler comprises four ports of a left upper input end, a left lower input end, a right upper output end and a right lower output end, and a coupler and a phase shifter with the two splitting ratios of 50: 50. The coupling resonance optical waveguide structure is formed by mutually connecting an adjustable coupler 2, an adjustable coupler 3, an adjustable coupler 4 and four curved optical waveguides, and comprises four ports, namely an upper left input end, a lower left input end, an upper right output end and a lower right output end. The splitting ratio of the two output ports of the adjustable coupler can be changed by adjusting the phase shifter in the adjustable coupler. The invention has flexible reconfigurability, high integration level and various functions, and can be applied to the field of integrated photon filtering and microwave photon signal processing.
Description
Technical Field
The invention belongs to the field of integrated photon filtering and microwave photon signal processing, and relates to a reconfigurable optical filter chip based on an adjustable coupler cascade coupling resonance optical waveguide.
Background
In the field of integrated photonic filtering and microwave photonic signal processing, optical filters have a crucial role and have been a focus in this research field. However, in different application scenarios, it is usually necessary to design a specific optical filter to achieve a certain function. This results in very high development costs and very long development times. To solve this problem, scientists in the field began to study reconfigurable optical filter chips. By properly changing the parameters of the reconfigurable optical filter chip, the reconfigurable optical filter chip can realize multiple functions and meet the requirements of different scenes. The reconfigurable optical filter chip realized at present has a complex structure, insufficient functional reconfiguration and less types of filter spectrum reconstruction. Therefore, it is necessary to reduce the complexity of the chip structure of the reconfigurable optical filter, improve the reconfigurability of the function, and increase the types of the realizable filters, which is also a popular research direction in the field of integrated photonic filtering and microwave photonic signal processing.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a reconfigurable optical filter chip based on a cascade coupling resonance optical waveguide of an adjustable coupler, which realizes multiple filter functions and has flexible reconfigurability.
The invention relates to a reconfigurable optical filter chip based on an adjustable coupler cascade coupling resonance optical waveguide, which is realized by the following technical scheme: by adjusting the phase shifter in the adjustable coupler 1, the phase difference of the adjustable coupler 1 is integral multiple of pi, and an optical signal is output from the upper right output end of the adjustable coupler 1 or from the lower right output end of the adjustable coupler 1, so that a single injection mode of the coupled resonant optical waveguide is realized. In the single injection mode, the phase shifter of the tunable coupler 2, the phase shifter of the tunable coupler 3 and the phase shifter of the tunable coupler 4 realize a flat-top narrow-band filter and a band-stop filter with high extinction ratio. By adjusting the phase shifter in the adjustable coupler 1, the phase difference of the adjustable coupler 1 is not integral multiple of pi, and optical signals are simultaneously output from the upper right output end and the lower right output end of the adjustable coupler 1, so that the double-injection mode of the coupled resonant optical waveguide is realized. In the dual injection mode, a triangular filter, a rectangular filter, a sine-shaped filter, an interleaving filter, a band-stop filter, a band-pass filter and a Tangent-shaped filter can be realized by adjusting the phase shifter 1, the phase shifter 2, the phase shifter of the tunable coupler 3 and the phase shifter of the tunable coupler 4.
According to the inventive concept, a reconfigurable optical filter chip based on an adjustable coupler cascade coupling resonance optical waveguide comprises: the optical coupler comprises a first optical input port (1), a second optical input port (2), a tunable coupler 1(3), a phase shifter 1(4), a phase shifter 2(5), a coupling resonance optical waveguide (6), a first optical output port (7) and a second optical output port (8); wherein:
the adjustable coupler 1(3) comprises four ports of a left upper input end, a left lower input end, a right upper output end and a right lower output end, a coupler with two splitting ratios of 50:50 and a phase shifter. The splitting ratio of the upper right output end and the lower right output end of the adjustable coupler can be changed by adjusting the phase shifter of the adjustable coupler.
The coupling resonance optical waveguide (6) is formed by mutually connecting an adjustable coupler 2, an adjustable coupler 3, an adjustable coupler 4 and four bent optical waveguides, and comprises four ports, namely an upper left input end, a lower left input end, an upper right output end and a lower right output end. Optical signals are input from the upper left input end and the lower left input end of the coupling resonance optical waveguide, enter the device and are output from the upper right output end and the lower right output end.
Furthermore, the phase shifter of the adjustable coupler (3) is realized by adopting a thermo-optic effect, an electro-optic effect or a plasma dispersion effect of an optical waveguide.
Further, the two couplers with the splitting ratio of 50:50 are realized by adopting a directional coupler with the splitting ratio of 50:50, an adiabatic coupler with the splitting ratio of 50:50 or a multimode interference coupler with the splitting ratio of 50: 50.
Further, the reconfigurable optical filter chip based on the tunable coupler cascade coupling resonance optical waveguide is realized by adopting the following materials: silicon on insulator, silicon nitride, lithium niobate, organic polymers, silicon oxynitride, silicon dioxide.
Furthermore, the first optical input port (1), the second optical input port (2), the adjustable coupler 1(3), the phase shifter 1(4), the phase shifter 2(5), the coupling resonance optical waveguide (6), the first optical output port (7) and the second optical output port (8) can realize on-chip integration.
Has the advantages that:
(1) compared with the prior art, the invention effectively reconstructs various optical filter types including a flat-top narrow-band filter, a triangular filter, a rectangular filter, a sine-shaped filter, an interweaving filter, a band-stop filter and a band-pass filter in a mode of coupling the tunable coupler with the resonance optical waveguide, thereby enriching the functions of a reconfigurable optical filter chip.
(2) The reconfigurable optical filter chip reduces the complexity and the manufacturing cost of the device, improves the integration level of the device, and is more flexibly applied to the field of integrated photon filtering and microwave photon signal processing.
Drawings
Fig. 1 is a schematic structural diagram of a reconfigurable optical filter chip based on a tunable coupler cascade coupling resonant optical waveguide provided by the invention.
Fig. 2 is a flat-top narrow-band filter for a second optical output port of a single injection-coupled resonant optical waveguide.
Fig. 3 is a triangular filter for a first optical output port of a dual injection-coupled resonant optical waveguide.
Fig. 4 is a rectangular filter of a first optical output port of a dual injection-coupled resonant optical waveguide.
Fig. 5 is a sine-shaped filter for a first optical output port of a dual injection-coupled resonant optical waveguide.
Fig. 6 is an interleaving filter for a first optical output port of a dual injection-coupled resonant optical waveguide.
Fig. 7 is a band stop filter for the first optical output port of a dual injection-coupled resonant optical waveguide.
Fig. 8 is a band pass filter of a first optical output port of a dual injection coupled resonant optical waveguide.
Fig. 9 shows a finger-shaped filter for the first optical output port of the double injection-coupled resonant optical waveguide.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 is a schematic structural diagram of a reconfigurable optical filter chip based on a tunable coupler cascade coupling resonant optical waveguide provided by the invention, and the reconfigurable optical filter chip includes a chip architecture diagram, a tunable coupler structural diagram, and a coupling resonant optical waveguide structural diagram. The chip is mainly composed of the following units: the device comprises a first optical input port, a second optical input port, a tunable coupler 1, a phase shifter 2, a coupling resonance optical waveguide, a first optical output port and a second optical output port. The adjustable coupler mainly comprises the following units: four ports of a left upper input end, a left lower input end, a right upper output end and a right lower output end, a coupler with the light splitting ratio of 50:50 and a phase shifter. The coupling resonance optical waveguide structure is formed by mutually connecting an adjustable coupler 2, an adjustable coupler 3, an adjustable coupler 4 and four curved optical waveguides, and comprises four ports, namely an upper left input end, a lower left input end, an upper right output end and a lower right output end. In the chip architecture diagram, an optical input signal enters the tunable coupler 1 from either the first optical input port or the second optical input port. The tunable coupler 1 splits the optical signal into two paths, which enter the phase shifter 1 and the phase shifter 2, respectively. After phase shift is introduced through the phase shifter 1 and the phase shifter 2, the optical signal enters the coupling resonance optical waveguide to perform spectrum shaping. Finally, the optical signal is output through the first optical output port and the second optical output port. The whole structure is modeled and analyzed by a transmission matrix method.
Fig. 2 is a flat-top narrow-band filter for a second optical output port of a single injection-coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted so that the phase difference of the tunable coupler 1 is an odd multiple of pi, and the optical signal is output from the upper right output end of the tunable coupler 1. In this case the adjustable coupler 1 behaves as an optical switch. The optical signal passes through the phase shifter 1 and then enters the coupling resonance optical waveguide structure, and the coupling resonance optical waveguide enters a single injection mode. And then modeling and optimizing the single injection coupling resonance optical waveguide structure by using a Z transformation technology, a zero pole theory and a low-pass digital filter technology. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.3: 0.7, 0.031: 0.969, 0.3: 0.7, a bandpass filter operating in the 1.55 μm communication wavelength range, 3.38GHz in 3-dB bandwidth, 30dB in extinction ratio, 1.74 in form factor, and 42GHz in free spectral range can be obtained, corresponding to the transmission spectrum of the second optical output port. Similarly, when an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted so that the phase difference of the tunable coupler 1 is even times pi, and the optical signal is output from the lower right output end of the tunable coupler 1. The optical signal passes through the phase shifter 2 and then enters the coupling resonance optical waveguide structure, and the coupling resonance optical waveguide enters a single injection mode. And then modeling and optimizing the single injection coupling resonance optical waveguide structure by using a Z transformation technology, a zero pole theory and a low-pass digital filter technology to obtain the same band-pass filter as the above and a transmission spectrum corresponding to the first optical output port.
Fig. 3 is a triangular filter for a first optical output port of a dual injection-coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted, so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal at the same time, and the splitting ratio is 50: 50. The adjustable coupler 1 behaves as a directional coupler with variable splitting ratio. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1 and then enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the tunable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.35: 0.65, 1: 0. 0.97: 0.03, a triangular wave filter operating in the 1.55 μm communication wavelength range can be obtained, corresponding to the transmission spectrum of the first optical output port.
Fig. 4 is a rectangular filter of a first optical output port of a dual injection-coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted, so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal at the same time, and the splitting ratio is 50: 50. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1, the phase shifter 1 is adjusted to obtain a phase of 0.5 pi, and then the optical signal enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the tunable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.6: 0.4, 1: 0. 0.7: 0.3, a rectangular wave filter with the working wavelength of 1.5495-1.5515 mu m can be obtained, and the transmission spectrum of the rectangular wave filter corresponds to the first optical output port.
Fig. 5 is a sinusoidal filter for a first optical output port of a dual injection coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted, so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal at the same time, and the splitting ratio is 50: 50. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1, the phase of 0.5 pi is introduced into the adjustable phase shifter 1, and then enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the tunable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.85: 0.15, 1: 0. 0.85: 0.15, a sine wave filter with the working wavelength of 1.5495-1.5515 mu m can be obtained, and the transmission spectrum of the sine wave filter corresponds to the first optical output port.
Fig. 6 is an interleaving filter for a first optical output port of a dual injection-coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted, so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal simultaneously, and the splitting ratio is 50: 50. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1, the phase of 0.5 pi is introduced into the adjustable phase shifter 1, and then enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the tunable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.8: 0.2, 1: 0. 0.8: 0.2, an interleaving filter with the working wavelength of 1.5495-1.5515 mu m can be obtained, and the interleaving filter corresponds to the transmission spectrum of the first optical output port.
Fig. 7 is a band stop filter for the first optical output port of a dual injection-coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal at the same time, and the splitting ratio is 75: 25. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1 and then enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the adjustable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.03: 0.97, 1: 0. 0.09: 0.91, a band elimination filter with the working wavelength of 1.5495-1.5515 mu m can be obtained, and the transmission spectrum of the band elimination filter corresponds to the first optical output port.
Fig. 8 is a band pass filter of a first optical output port of a dual injection coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal at the same time, and the splitting ratio is 20: 80. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1 and then enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the tunable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.06: 0.94, 1: 0. 0.19: 0.81, a band-pass filter with the working wavelength of 1.5495-1.5515 mu m can be obtained, and the transmission spectrum of the band-pass filter corresponds to the first optical output port.
Fig. 9 is a finger filter of the first optical output port of the dual injection-coupled resonant optical waveguide. When an optical signal enters the tunable coupler 1 from the first optical input port, the phase shifter in the tunable coupler 1 is adjusted, so that the upper right output port and the lower right output port of the tunable coupler 1 output the optical signal at the same time, and the splitting ratio is 50: 50. An optical signal at the upper right output end of the adjustable coupler 1 passes through the phase shifter 1 and then enters from the upper left input end of the coupling resonance optical waveguide; the optical signal at the lower right output end of the tunable coupler 1 passes through the phase shifter 2 and then enters from the lower left input end of the coupled resonant optical waveguide. The two input ends of the coupling resonance optical waveguide simultaneously input optical signals, and the coupling resonance optical waveguide shows a double injection mode. And modeling and simulating the coupled resonant optical waveguide in the mode by using a transmission matrix method. Adjusting phase shifters of the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 to enable the splitting ratios of the three adjustable couplers to be respectively: 0.14: 0.86, 1: 0. 0.32: 0.68, a Tangent-shaped filter with the working wavelength of 1.5495-1.5515 mu m can be obtained, and the transmission spectrum of the Tangent-shaped filter corresponds to the first optical output port.
The above-described embodiments of the present invention will be described in further detail with respect to the object and technical means. It should be understood that the above-mentioned embodiments are merely exemplary of the present invention, and are not intended to limit the present invention, and any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A reconfigurable optical filter chip based on an adjustable coupler cascade coupling resonance optical waveguide is characterized in that: the optical coupler comprises a first optical input port (1), a second optical input port (2), a tunable coupler 1(3), a phase shifter 1(4), a phase shifter 2(5), a coupling resonance optical waveguide (6), a first optical output port (7) and a second optical output port (8); wherein:
the coupling resonance optical waveguide (6) is formed by mutually connecting an adjustable coupler 2, an adjustable coupler 3, an adjustable coupler 4 and four bent optical waveguides and comprises four ports of an upper left input end, a lower left input end, an upper right output end and a lower right output end; optical signals are input from the upper left input end and the lower left input end of the coupling resonance optical waveguide (6), enter the device and are output from the upper right output end and the lower right output end;
the adjustable couplers 1 and 3, the adjustable coupler 2, the adjustable coupler 3 and the adjustable coupler 4 respectively comprise four ports of a left upper input end, a left lower input end, a right upper output end and a right lower output end, and two couplers and phase shifters with the splitting ratio of 50: 50; the splitting ratio of the upper right output end and the lower right output end of the adjustable coupler can be changed by adjusting the phase shifter of the adjustable coupler.
2. The reconfigurable optical filter chip based on the tunable coupler cascade coupling resonance optical waveguide as claimed in claim 1, wherein the phase shifter, the phase shifter 1(4), the phase shifter 2(5) are implemented by using thermo-optic effect, electro-optic effect or magneto-optic effect of the optical waveguide.
3. The reconfigurable optical filter chip based on the tunable coupler cascade coupling resonance optical waveguide as claimed in claim 1, wherein the two couplers with a splitting ratio of 50:50 are implemented by a directional coupler with a splitting ratio of 50:50, an adiabatic coupler with a splitting ratio of 50:50, or a multimode interference coupler with a splitting ratio of 50: 50.
4. The reconfigurable optical filter chip based on the tunable coupler cascade coupling resonance optical waveguide according to claim 1, wherein the reconfigurable optical filter chip is realized by adopting the following materials: silicon-on-insulator, silicon nitride, lithium niobate, organic polymer, silicon oxynitride, or silicon dioxide.
5. The reconfigurable optical filter chip based on the tunable coupler cascade coupling resonant optical waveguide according to claim 1, wherein the first optical input port (1), the second optical input port (2), the tunable coupler 1(3), the phase shifter 1(4), the phase shifter 2(5), the coupled resonant optical waveguide (6), the first optical output port (7), and the second optical output port (8) are integrated on a chip.
6. The reconfigurable optical filter chip based on the tunable coupler cascade coupling resonance optical waveguide as claimed in claim 1, wherein the phase shifter in the tunable coupler 1 is tuned to realize a single injection mode of the coupling resonance optical waveguide when light is outputted from a single port from an upper right output end or a lower right output end of the tunable coupler 1; when light is output in a dual-port mode from the upper right output end and the lower right output end of the adjustable coupler 1 simultaneously according to a certain proportion, a dual-injection mode of the coupled resonant optical waveguide is realized.
7. The reconfigurable optical filter chip based on the tunable coupler cascade coupling resonance optical waveguide as claimed in claim 6, wherein when the coupling resonance optical waveguide enters a single injection mode, the phase shifter of the tunable coupler 3 is adjusted so that the optical signals at the upper right output end and the lower right output end of the tunable coupler 3 are not zero, and a flat-top narrow-band filter can be realized by adjusting the phase shifter of the tunable coupler 2 and the phase shifter of the tunable coupler 4; if an optical signal enters from the upper left input end of the coupled resonant optical waveguide, the phase shifter of the adjustable coupler 3 is adjusted to enable the optical signal at the lower right output end of the adjustable coupler 3 to be zero, and a band-stop filter with a high extinction ratio can be realized at the first optical output port by adjusting the phase shifter of the adjustable coupler 2; if an optical signal enters from the lower left input end of the coupling resonance optical waveguide, the phase shifter of the adjustable coupler 3 is adjusted to enable the optical signal at the upper right output end of the adjustable coupler 3 to be zero, and the band-stop filter with high extinction ratio can be realized at the second optical output port by adjusting the phase shifter of the adjustable coupler 4.
8. The reconfigurable optical filter chip based on tunable coupler cascade coupling resonance optical waveguide as claimed in claim 6, wherein when the coupled resonance optical waveguide enters into the dual injection mode, the phase shifter of the tunable coupler 3 is adjusted to make the optical signal at the lower right output end of the tunable coupler 3 approach to 1, and the chip can be reconfigured into different optical filters by adjusting the phase shifter of the tunable coupler 1, the phase shifter 2, the phase shifter of the tunable coupler 2 and the phase shifter of the tunable coupler 4, so as to realize a triangular filter, a rectangular filter, a sine-shaped filter, an interleaving filter, a band-stop filter, a band-pass filter and a finger-shaped filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900280A (en) * | 2020-06-22 | 2022-01-07 | 浙江大学 | Polarization independent optical switch |
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| JPH0749511A (en) * | 1993-08-09 | 1995-02-21 | Nippon Telegr & Teleph Corp <Ntt> | Waveguide type optical switch |
| US6212315B1 (en) * | 1998-07-07 | 2001-04-03 | Lucent Technologies Inc. | Channel power equalizer for a wavelength division multiplexed system |
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|---|---|---|---|---|
| JPH0749511A (en) * | 1993-08-09 | 1995-02-21 | Nippon Telegr & Teleph Corp <Ntt> | Waveguide type optical switch |
| US6212315B1 (en) * | 1998-07-07 | 2001-04-03 | Lucent Technologies Inc. | Channel power equalizer for a wavelength division multiplexed system |
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| ZHENG, PF等: "Integrated Multi-Functional Optical Filter Based on a Self-Coupled Microring Resonator Assisted MZI Structure", JOURNAL OF LIGHTWAVE TECHNOLOGY, pages 1429 - 1437 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900280A (en) * | 2020-06-22 | 2022-01-07 | 浙江大学 | Polarization independent optical switch |
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