CN114563844A - Novel cascaded microsphere cavity filter - Google Patents
Novel cascaded microsphere cavity filter Download PDFInfo
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- CN114563844A CN114563844A CN202110742637.8A CN202110742637A CN114563844A CN 114563844 A CN114563844 A CN 114563844A CN 202110742637 A CN202110742637 A CN 202110742637A CN 114563844 A CN114563844 A CN 114563844A
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- erbium
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- tapered
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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
- G02B6/29341—Loop resonators operating in a whispering gallery mode evanescently coupled to a light guide, e.g. sphere or disk or cylinder
-
- 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
- G02B6/2938—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 for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
Abstract
The invention provides a novel cascade microsphere cavity filter, which comprises: the system comprises a broadband laser, an EDFA erbium-doped fiber amplifier, erbium-doped microspheres, a tapered fiber and an optical coupler; the broadband laser is connected with the input end of the EDFA erbium-doped fiber amplifier, the output end of the EDFA erbium-doped fiber amplifier is connected with at least one optical fiber, the tail end of each optical fiber is connected with a tapered optical fiber, erbium-doped microspheres are fixed on the tapered optical fibers, and lasers in the erbium-doped microspheres are selected by the optical coupler and output in a superposition mode after being coupled with the tapered optical fibers. According to the novel cascade microsphere cavity filter, light with different wavelengths passes through mode selection in the resonant cavity, and therefore filtering can be effectively achieved. The filter is more beneficial to integration due to small size, and meanwhile, the coupling packaging structure is compact, the cost of manufacturing materials is low, and the filter is suitable for large scale.
Description
Technical Field
The invention relates to the technical field of laser filters, in particular to a novel cascade microsphere cavity filter.
Background
With the development of communication technology, the optical communication network needs to continuously improve the working performance and reduce the operation cost, and the core technology of the optical communication network lies in the miniaturization, integration, scale and high precision of an optical waveguide device. In the future, a novel optical waveguide device capable of realizing multiple functions and high efficiency is urgently needed for an all-optical network. The series micro-ring resonator filter has different light transmission directions for the number of rings being odd or even, and has high difficulty in manufacturing process, high dependence on environment and low quality factor. When the number N of the micro-rings of the parallel micro-ring resonant filter is changed from small to large, the main resonant peak is changed from upward convex to flat, the bandwidth is narrowed, the side lobe is increased, and the secondary resonant peak is raised, so that the non-resonant light is strengthened, the interference signal is enhanced, and the optical detection difficulty is increased. And the processing of the disc-shaped cavity belongs to a new process explored in recent years, and the smoothness is not enough and the quality factor Q is lower through chemical etching. In order to overcome the defects and further improve the filtering performance of the micro-ring resonant filter, the invention designs a novel micro-sphere resonant cavity mode selection filter, and light with different wavelengths is subjected to mode selection in a resonant cavity and resonated by integral multiples of the wavelength, so that the filtering can be effectively carried out.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a novel cascade type microsphere cavity filter.
The invention is realized by the following technical scheme: a novel cascaded microsphere cavity filter, the filter comprising: the system comprises a broadband laser, an EDFA erbium-doped fiber amplifier, erbium-doped microspheres, a tapered fiber and an optical coupler; the broadband laser is connected with the input end of the EDFA erbium-doped fiber amplifier, the output end of the EDFA erbium-doped fiber amplifier is connected with at least one optical fiber, the tail end of each optical fiber is connected with a tapered optical fiber, erbium-doped microspheres are fixed on the tapered optical fibers, and lasers in the erbium-doped microspheres are selected by the optical coupler and output in a superposition mode after being coupled with the tapered optical fibers.
In the above scheme, the output end of the EDFA erbium-doped fiber amplifier is connected with a main-path fiber.
In the above scheme, the tail end of the main optical fiber is connected with three groups of tapered optical fibers in series, each group of tapered optical fibers is connected with an optical coupler, each group of tapered optical fibers is fixed with erbium-doped microspheres, laser in the erbium-doped microspheres in the previous group is coupled with the tapered optical fibers, the laser enters the erbium-doped microspheres in the next group of tapered optical fibers again through the selective superposition of the optical couplers, and each group of optical couplers is also connected with a PORT PORT for mode selection output.
In the above scheme, the output end of the EDFA erbium-doped fiber amplifier is input to the optical coupler via a main path fiber and then connected in parallel with a first branch fiber and a second branch fiber.
In the above scheme, the tail ends of the first branch optical fiber and the second branch optical fiber are respectively connected in series with a tapered optical fiber, the tapered optical fibers are both fixed with erbium-doped microspheres, lasers in the two groups of erbium-doped microspheres are respectively coupled with corresponding tapered optical fibers, and then are superposed by an optical coupler and enter the main path optical fiber again, and the main path optical fiber is connected with the optical fiber laser beat frequency device for mode selection output.
In the scheme, the radius of the ball cavity of the erbium-doped microsphere is different.
In the scheme, the radius of the cavity of the erbium-doped microsphere is the same.
Compared with the prior art, the novel cascade microsphere cavity filter has the beneficial effects that:
1. the invention combines the series-parallel connection filtering of the microsphere cavity and the series-parallel connection of the circuit, realizes the functions of novel wavelength division multiplexing and optical beat frequency, and can be applied to multifunctional sensing and filtering.
2. The microsphere cavity filter has small size and higher Q value (theoretically up to 10)10Above), the quality factors of the micro-ring resonator and the micro-disk resonator (<105)105The method is more favorable for integration, and can be applied to the aspects of filtering, optical switches, lasers, optical couplers, modulators, dispersion compensators, biological sensing, tuners, concentration sensing detection of harmful gases and the like.
3. The micro-sphere cavity filter is simple to manufacture, couples the evanescent-optical field generated by the tapered optical fiber with the spherical cavity, and is cured and packaged by the ultraviolet glue, so that the micro-sphere cavity filter is compact in structure and low in manufacturing material cost.
Drawings
FIG. 1 is a block diagram of a series cascaded microsphere resonant cavity filter system;
FIG. 2 is a diagram of a coupling package structure of a series-cascaded microsphere resonant cavity;
FIG. 3 is a block diagram of a parallel cascaded microsphere resonant cavity filter system;
FIG. 4 is a diagram of a coupling package structure of a parallel cascaded microsphere resonant cavity;
in the figure: 1. the optical fiber amplifier comprises a broadband laser, 2, an input end, 3, an EDFA erbium-doped fiber amplifier, 4, an output end, 5, a tapered fiber, 6, an optical coupler, 7, a main path fiber, 8, erbium-doped microspheres, 9, a PORT PORT, 10, a fiber laser beat frequency device, 11, a first branch fiber and 12, a second branch fiber.
Detailed Description
The novel cascaded microsphere cavity filter of the invention is further described with reference to the following specific embodiments in combination with the accompanying drawings:
fig. 1 is a structural block diagram of a series-cascaded microsphere resonant cavity filter system, and fig. 2 is a structural diagram of a coupling package of a series-cascaded microsphere resonant cavity. In the figure, the filter includes: the device comprises a broadband laser 1, an EDFA erbium-doped fiber amplifier 3, erbium-doped microspheres 8, a tapered fiber 5 and an optical coupler 6; the broadband laser 1 is connected with the input end 2 of the EDFA erbium-doped fiber amplifier 3, and the output end 4 of the EDFA erbium-doped fiber amplifier 3 is connected with a main circuit fiber 7. The tail end of the main path optical fiber 7 is connected with three groups of tapered optical fibers 5 in series, each group of tapered optical fibers 5 is connected with an optical coupler 6, erbium-doped microspheres 8 are fixed on a taper region on each group of tapered optical fibers 5 through an ultraviolet curing technology, the radius of a spherical cavity of each erbium-doped microsphere 8 is sequentially increased in an increasing mode, laser in the previous group of erbium-doped microspheres 8 is coupled with the tapered optical fibers 5 and then selectively superposed again through the optical coupler 6 to enter the erbium-doped microspheres 8 on the next group of tapered optical fibers 5, and each group of optical couplers 6 are also connected with PORT PORTs 9 for mode selection output.
The cascaded microsphere cavity in series has a wavelength division multiplexing function, as shown in fig. 1, after a light source of a broadband laser 1 is subjected to power amplification, the light source enters the filter from an output end 4, signals with different wavelengths are optically coupled to enter erbium-doped microspheres 8 with different sizes, if the diameter or the circumference of the microsphere cavity of the erbium-doped microspheres 8 is matched with a specific wavelength, a WGM mode of a echo wall is met, resonance begins, the signals are finally led out through different PORT PORTs, and signals with other wavelengths are selected by an optical coupler 6 to be superposed again to enter the erbium-doped microspheres 8 on a next group of tapered optical fibers 5. Therefore, the resonant filtering is carried out by spherical cavities with different radiuses aiming at different wavelengths of broadband laser, and the function of a high-quality filter is realized.
Fig. 3 is a structural block diagram of a parallel cascaded microsphere resonant cavity filter system, and fig. 4 is a structural diagram of a coupling package of a parallel cascaded microsphere resonant cavity. In the figure, the filter includes: the device comprises a broadband laser 1, an EDFA erbium-doped fiber amplifier 3, erbium-doped microspheres 8, a tapered fiber 5 and an optical coupler 6; the broadband laser 1 is connected with the input end 2 of the EDFA erbium-doped fiber amplifier 3, and the output end 4 of the EDFA erbium-doped fiber amplifier 3 is input into the optical coupler 6 through a main path fiber 7 and then is connected with a first shunt fiber 11 and a second shunt fiber 12 in parallel. The tail ends of the first branch optical fiber 11 and the second branch optical fiber 12 are respectively connected with the tapered optical fibers 5 in series, erbium-doped microspheres 8 are fixed on the tapered optical fibers 5, lasers in the two groups of erbium-doped microspheres 8 are coupled with the corresponding tapered optical fibers 5 respectively and then are superposed again through the optical coupler 6 to enter the main path optical fiber 7, and the main path optical fiber 7 is connected with the optical fiber laser beat frequency device 10 for mode selection output.
The parallel microsphere cavity has beat frequency function, as shown in fig. 3, the light source of the broadband laser 1 enters the first branch optical fiber 11 and the second branch optical fiber 12 in the filter from the output end 4 after power amplification, the signal light is respectively coupled into the two erbium-doped microspheres 8, the optical frequency of 1550nm wavelength can reach 1014Hz, the two microspheres with similar sizes have smaller difference value of resonant optical frequency compared with the optical frequency, meet the optical beat frequency condition and are output from the optical fiber laser beat frequency device 10 in a mode selection way. The strength of signal is alternatively changed with time called beat, and the change number in unit time is beat frequency, i.e. the local shape of a certain wave is still the wave vibrating at original frequency, but the outer edge of the wave peak formsThe beat frequency sensing of the ball cavity can be realized by utilizing the optical beat frequency due to the change of the strength, namely the change of the amplitude. Therefore, the beat frequency sensing detection function is realized by using the beat frequency condition that the resonance frequency of the two beams of light is larger and the frequency difference is smaller.
The invention relates to a novel cascade microsphere cavity filter, which can effectively filter light with different wavelengths by selecting modes in a resonant cavity and resonating the light with integral multiple of the wavelength. The filter has a quality factor of 10 for the micro-ring resonator and the micro-disk resonator due to its small size5The coupling packaging structure is more than double, is more beneficial to integration, can be applied to the aspects of filtering, optical switches, lasers, optical couplers, modulators, dispersion compensators, biological sensing, tuners, harmful gas concentration sensing detection and the like, and is compact in structure, low in manufacturing material cost and suitable for large-scale production.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A novel cascaded microsphere cavity filter, the filter comprising: the device comprises a broadband laser (1), an EDFA erbium-doped fiber amplifier (3), erbium-doped microspheres (8), a tapered fiber (5) and an optical coupler (6); the erbium-doped fiber amplifier is characterized in that a broadband laser (1) is connected with an input end (2) of an EDFA erbium-doped fiber amplifier (3), at least one optical fiber is connected with an output end (4) of the EDFA erbium-doped fiber amplifier (3), the tail end of each optical fiber is connected with a tapered optical fiber (5), erbium-doped microspheres (8) are fixed on the tapered optical fibers (5), and lasers in the erbium-doped microspheres (8) are selected and overlapped through an optical coupler (6) for output after being coupled with the tapered optical fibers (5).
2. The novel cascaded microsphere cavity filter of claim 1, wherein: the output end (4) of the EDFA erbium-doped fiber amplifier (3) is connected with a main path fiber (7).
3. The novel cascaded microsphere cavity filter of claim 2, wherein: the end of the main path optical fiber (7) is connected with three groups of tapered optical fibers (5) in series, each group of tapered optical fibers (5) is connected with an optical coupler (6), each group of tapered optical fibers (5) is fixedly provided with erbium-doped microspheres (8), laser in the previous group of erbium-doped microspheres (8) is coupled with the tapered optical fibers (5), the laser is selectively overlapped again through the optical coupler (6) to enter the erbium-doped microspheres (8) on the next group of tapered optical fibers (5), and each group of optical couplers (6) is further connected with a PORT PORT (9) for mode selection output.
4. The novel cascaded microsphere cavity filter of claim 1, wherein: the output end (4) of the EDFA erbium-doped fiber amplifier (3) is input into the optical coupler (6) through a main branch fiber (7) and then is connected with a first branch fiber (11) and a second branch fiber (12) in parallel.
5. The novel cascaded microsphere cavity filter of claim 4, wherein: the tail ends of the first branch optical fiber (11) and the second branch optical fiber (12) are respectively connected with a tapered optical fiber (5) in series, erbium-doped microspheres (8) are fixed on the tapered optical fibers (5), lasers in the two groups of erbium-doped microspheres (8) are respectively coupled with the corresponding tapered optical fibers (5), then are superposed again through an optical coupler (6) and enter a main path optical fiber (7), and the main path optical fiber (7) is connected with an optical fiber laser beat frequency device (10) for mode selection output.
6. The novel cascaded microsphere cavity filter of claim 3, wherein: the radius of the cavity of the erbium-doped microsphere (8) is different.
7. The novel cascaded microsphere cavity filter of claim 5, wherein: the radii of the ball cavities of the erbium-doped microspheres (8) are equal.
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Citations (8)
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| US5524118A (en) * | 1994-12-07 | 1996-06-04 | Electronics And Telecommunications Research Institute | Wavelength-varying multi-wavelength optical filter laser using a single pump light source |
| CN102435348A (en) * | 2011-11-17 | 2012-05-02 | 中北大学 | High-Q optical microcavity-based temperature sensor and distributed type temperature sensing network |
| CN103490823A (en) * | 2013-09-22 | 2014-01-01 | 中国科学院半导体研究所 | Multi-microwave local oscillation source generating device based on microwave photons |
| CN103575313A (en) * | 2013-11-21 | 2014-02-12 | 黑龙江大学 | Multi-longitudinal mode annular cavity laser sensor frequency division multiplexing device based on beat frequency technology |
| CN106953226A (en) * | 2017-04-14 | 2017-07-14 | 南京邮电大学 | A kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type |
| CN207069278U (en) * | 2017-04-14 | 2018-03-02 | 南京邮电大学 | A kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type |
| CN109633821A (en) * | 2018-12-24 | 2019-04-16 | 暨南大学 | A kind of preparation method and microwave photon filter of microcavity coupled system |
| CN112903545A (en) * | 2021-03-16 | 2021-06-04 | 华侨大学 | Multi-channel sensing system and detection method |
-
2021
- 2021-07-01 CN CN202110742637.8A patent/CN114563844A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5524118A (en) * | 1994-12-07 | 1996-06-04 | Electronics And Telecommunications Research Institute | Wavelength-varying multi-wavelength optical filter laser using a single pump light source |
| CN102435348A (en) * | 2011-11-17 | 2012-05-02 | 中北大学 | High-Q optical microcavity-based temperature sensor and distributed type temperature sensing network |
| CN103490823A (en) * | 2013-09-22 | 2014-01-01 | 中国科学院半导体研究所 | Multi-microwave local oscillation source generating device based on microwave photons |
| CN103575313A (en) * | 2013-11-21 | 2014-02-12 | 黑龙江大学 | Multi-longitudinal mode annular cavity laser sensor frequency division multiplexing device based on beat frequency technology |
| CN106953226A (en) * | 2017-04-14 | 2017-07-14 | 南京邮电大学 | A kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type |
| CN207069278U (en) * | 2017-04-14 | 2018-03-02 | 南京邮电大学 | A kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type |
| CN109633821A (en) * | 2018-12-24 | 2019-04-16 | 暨南大学 | A kind of preparation method and microwave photon filter of microcavity coupled system |
| CN112903545A (en) * | 2021-03-16 | 2021-06-04 | 华侨大学 | Multi-channel sensing system and detection method |
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