CN116107033A - Optical fiber wavelength tunable filter - Google Patents
Optical fiber wavelength tunable filter Download PDFInfo
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- CN116107033A CN116107033A CN202310259854.0A CN202310259854A CN116107033A CN 116107033 A CN116107033 A CN 116107033A CN 202310259854 A CN202310259854 A CN 202310259854A CN 116107033 A CN116107033 A CN 116107033A
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- grating
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- collimating lens
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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
- G02B6/29304—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 diffraction, e.g. grating
- G02B6/29305—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 diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/29311—Diffractive element operating in transmission
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
-
- 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
- G02B6/29304—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 diffraction, e.g. grating
- G02B6/29305—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 diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/29313—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 diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide characterised by means for controlling the position or direction of light incident to or leaving the diffractive element, e.g. for varying the wavelength response
-
- 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
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
- G02B6/3518—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The invention discloses an optical fiber wavelength tunable filter, which relates to the technical field of filters and comprises a plurality of pairs of n pairs of optical fibers, optical fiber sleeves, a collimating lens, a grating, a quarter wave plate and an MEMS rotary reflector, wherein the optical fiber sleeves are sleeved on the outer walls of the n pairs of optical fibers. The optical signals are reflected back to the quarter wave plate, the grating, the collimating lens and the optical fibers in the optical fiber sleeve through the arranged MEMS rotary reflecting mirror, the reflecting angle of the MEMS rotary reflecting mirror is adjusted, the optical signals with required wavelengths are output from the B12, namely, the filtering function is realized, the wavelengths of the output optical signals are changed, meanwhile, the collimating lens, the grating, the quarter wave plate and the MEMS rotary reflecting mirror are repeatedly shared for n times, the cascade connection of the n times of filtering functions is realized, the additional collimating lens, the grating, the quarter wave plate and the MEMS rotary reflecting mirror are not added, the cost is effectively controlled, and the bandwidth of the filter is narrowed and the resolution is improved on the basis that the line density of the grating is not increased and the number of the grating pieces is not increased.
Description
Technical Field
The invention relates to the technical field of filters, in particular to an optical fiber wavelength tunable filter.
Background
In modern optical fiber network systems, optical fiber wavelength tunable filters are indispensable optical devices. The optical fiber wavelength tunable filter is an optical device for wavelength selection, which can select a desired wavelength from a plurality of different incident wavelengths or a continuous spectrum, while the light of the remaining wavelengths is not outputted, and the wavelength of the outputted optical signal can be adjusted according to the desired wavelength. Many optical fiber wavelength tunable filters are currently filters based on a combination of MEMS turning mirrors and grating technology, which are based on the angular adjustability of MEMS turning mirrors to achieve wavelength tuning within the operating band.
The optical fiber wavelength tunable filter based on the MEMS turning mirror and the grating technology utilizes grating elements in an optical path to carry out light splitting treatment on incident light signals, so that the emergent angles of light with different wavelengths are different after passing through the gratings, and the MEMS turning mirror deflects different angles by adjusting the voltage of the MEMS turning mirror, so that the wavelength tunability of the output light signals is realized. In such an optical path, the grating is responsible for the dispersion function. The denser the number of grating lines, the stronger the dispersion capability, the narrower the bandwidth of the filter, and the higher the resolution.
The conventional optical fiber wavelength tunable filter has the following problems in its use:
because the existing filter is used for obtaining narrower bandwidth and higher resolution, the common method is to increase the line number density of the grating or cascade more gratings, and the processing difficulty and the cost of the mode are high.
Disclosure of Invention
The invention aims to provide an optical fiber wavelength tunable filter which solves the technical problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a tunable filter of fiber wavelength, includes a plurality of pairs of optic fibre, fiber optic ferrule, collimating lens, grating, quarter wave plate and MEMS rotary mirror, the fiber optic ferrule has been cup jointed to the outer wall of n to optic fibre, one side to the optic fibre of n is provided with collimating lens, collimating lens keeps away from one side to the optic fibre of n and is provided with the grating, one side that the grating kept away from collimating lens is provided with the quarter wave plate, one side that the quarter wave plate kept away from the grating is provided with MEMS rotary mirror.
The outer walls of the n pairs of optical fibers and the inner walls of the optical fiber sleeves are mutually bonded and fixed through glue, the end faces of one side, bonded with the optical fiber sleeves, of the n pairs of optical fibers are polished, and an antireflection film is plated on the end faces.
Preferably, each of the n pairs of optical fibers is axisymmetrically arranged with the optical axis of the collimating lens as a central axis, and adjacent n pairs of optical fibers are sequentially connected.
Preferably, B11 and B12 of the n pairs of optical fibers constitute a pair of input optical fibers and output optical fibers.
Preferably, the collimating lens may be a single spherical lens, an aspherical lens, a graded index lens, or other collimating function lens, or a combination of multiple lenses.
Preferably, the MEMS rotating mirror may be implemented by an electrically driven rotating mirror, a rotating mirror rotated by a motor, or a manually rotated rotating mirror.
Preferably, a plurality of grating cascade grating groups are arranged on one side, away from the n pairs of optical fibers, of the collimating lens, a quarter wave plate is arranged on one side, away from the collimating lens, of the plurality of grating cascade grating groups, and an MEMS rotary reflecting mirror is arranged on one side, away from the plurality of grating cascade grating groups, of the quarter wave plate.
Preferably, the n pairs of optical fibers are arranged in parallel, and the n pairs of optical fibers are adhered and fixed with each other.
Compared with the related art, the optical fiber wavelength tunable filter provided by the invention has the following beneficial effects:
1. the invention provides an optical fiber wavelength tunable filter, an input optical signal is transmitted to a collimating lens through an optical fiber B11, the collimating lens collimates divergent light transmitted by the optical fiber, after the divergent light is collimated, the optical signal is incident to a grating, due to diffraction effect of the grating, light emergent angles of different wavelengths after passing through the grating are different, the optical signal of different angles (namely different wavelengths) after passing through the grating is transmitted to a quarter wave plate, the effect of the quarter wave plate is to adjust polarization-related loss PDL of the whole filter, the optical signal reaches an MEMS rotary reflecting mirror after passing through the quarter wave plate, the MEMS rotary reflecting mirror reflects the optical signal back to the quarter wave plate, the grating, the collimating lens and the optical fiber in an optical fiber sleeve, the reflecting angle of the MEMS rotary reflecting mirror is adjusted, so that the optical signal of the required wavelength is output from B12, namely the filtering function is realized, and the angle of the reflecting mirror is changed, namely the wavelength of the output optical signal is changed.
2. The invention provides an optical fiber wavelength tunable filter, each pair of optical fibers Bi1-Bi2 (1 +.i +.n) is input from B11 of a first pair of optical fibers through a filtering system formed by a collimating lens, a grating, a quarter wave plate and an MEMS rotary reflecting mirror, and finally an optical signal is output from Bn2 of a last pair of optical fibers, and compared with the previous B11 input optical signal, the B11 input and Bn2 output optical signal realize primary filtering, and the B12 output optical signal is equivalent to n times of cascading of filtering functions, so that the narrowing of the bandwidth of the filter and the improvement of the resolution are obviously realized, and meanwhile, the collimating lens, the grating, the quarter wave plate and the MEMS rotary reflecting mirror are repeatedly shared for n times in the process, so that the cost is effectively controlled without increasing the line density of the grating and the number of the grating plates, and the narrowing of the bandwidth of the filter and the improvement of the resolution are realized.
3. The invention provides an optical fiber wavelength tunable filter, which is characterized in that a single-chip grating is replaced by a multi-chip grating cascade grating group, and the multi-chip grating cascade grating group can narrow the bandwidth of the filter and improve the resolution ratio relative to the single-chip grating.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
FIG. 1 is a schematic view of an optical path of the present invention;
FIG. 2 is a schematic diagram of a symmetrical placement of n pairs of optical fibers in a fiber ferrule according to the present invention with system optical axes A1-A2;
FIG. 3 is a schematic view of an optical path of a multi-plate grating cascade grating set according to the present invention;
fig. 4 is a schematic diagram of a one-dimensional arrangement of n pairs of optical fibers according to the present invention.
In the figure: 1. n pairs of optical fibers; 2. an optical fiber ferrule; 3. a collimating lens; 4. a grating; 5. a quarter wave plate; 6. MEMS rotary mirror; 7. the multiple gratings are cascaded into a grating group.
Detailed Description
Embodiment one:
referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a tunable filter of fiber wavelength, including a plurality of pairs of n to optic fibre 1, fiber bushing 2, collimating lens 3, grating 4, quarter wave plate 5 and MEMS rotary mirror 6, the outer wall of n to optic fibre 1 has cup jointed fiber bushing 2, and one side of n to optic fibre 1 is provided with collimating lens 3, and one side that collimating lens 3 is kept away from n to optic fibre 1 is provided with grating 4, and one side that grating 4 kept away from collimating lens 3 is provided with quarter wave plate 5, and one side that quarter wave plate 5 kept away from grating 4 is provided with MEMS rotary mirror 6.
The outer walls of the n pairs of optical fibers 1 and the inner walls of the optical fiber sleeves 2 are mutually adhered and fixed through glue, the end face of one side, where the n pairs of optical fibers 1 and the optical fiber sleeves 2 are adhered, is polished, and is plated with an antireflection film, wherein the n pairs of optical fibers 1 placed in the optical fiber sleeves 2 are arranged in pairs, namely, the pair of B11 and B12, the pair of B21 and B22, and the pair of B31 and B32, namely, the pair of … … Bn1 and Bn 2.
In the cross-section shown in fig. 2, each n pairs of optical fibers 1 are arranged in an axisymmetric manner with the optical axis of the collimating lens 3 as the central axis, and adjacent n pairs of optical fibers 1 are sequentially connected, wherein, if the output optical fiber B12 in the first pair B11 and B12 is connected with the input optical fiber B21 in the second pair B21 and B22, the output optical fiber B22 in the second pair B22 and the input optical fiber B31 in the third pair B31 and B32, the output optical fiber B32 in the third pair B31 and B32 and the input optical fiber B41 in the fourth pair B41 and B42 are connected with each other, … … is connected with such a push-line optical fiber, and finally an optical signal is input from the B11 of the first pair of optical fibers, and is output from the Bn2 of the last pair of optical fibers, i.e. n pairs of optical fibers 1 share the same abstract system optical axis (i.e. the optical axis of the collimating lens 3), i.e. when the MEMS rotating mirror 6 is at a specific certain angle, if Bi1 (i.ltoreq.n) optical axis of each pair of optical fibers B1 and B2 is equal to n, we can define "n optical fibers as the same system" if n is the optical axis of optical fiber and B2 is shared by n.
B11 and B12 in the n pairs of optical fibers 1 form a pair of input optical fibers and output optical fibers, wherein an optical signal enters from B11, and the output from B12 realizes primary optical signal filtering.
The collimating lens 3 may be a single spherical lens, an aspherical lens, a graded index lens, or other collimating function lens, or a combination of lenses, wherein the collimating lens 3 is used to achieve accurate beam positioning and measurement.
The MEMS rotary mirror 6 may be implemented by means of an electrically driven rotary mirror, a rotary mirror rotated by a motor, or a manually rotated rotary mirror, where the MEMS rotary mirror 6 may be used in applications such as adjusting an optical path, changing a reflection angle, etc., and has the characteristics of high accuracy, high speed, low power consumption, long service life, etc., and the rotary mirror 6 may be combined with a light source, a detector, an optical device, etc. to form an optical system, and is applied in fields such as optical imaging, optical communication, laser processing, etc.
In this embodiment, an input optical signal is transmitted to the collimating lens 3 through the optical fiber B11, the collimating lens 3 collimates divergent light transmitted from the optical fiber, after the divergent light is collimated, the optical signal is incident to the grating 4, due to diffraction effect of the grating, light emergent angles of different wavelengths after passing through the grating are different, and light signals of different angles, namely different wavelengths, after passing through the grating are transmitted to the quarter wave plate 5, the effect of the quarter wave plate 5 is to adjust polarization-dependent loss PDL of the whole filter, the light signals reach the MEMS rotary mirror 6 after passing through the quarter wave plate 5, the MEMS rotary mirror 6 reflects the light signals back to the quarter wave plate 5, the grating 4, the collimating lens 3 and the optical fiber in the optical fiber sleeve 2, the reflection angle of the MEMS rotary mirror 6 is adjusted, so that the light signals of a required wavelength are output from the B12, namely, the filtering function is realized, and the angle of the mirror is changed, namely the wavelength of the output optical signal is changed.
Each pair of optical fibers Bi1-Bi2 (1 +.i +.n) passes through a filtering system formed by a collimating lens 3, a grating 4, a quarter wave plate 5 and a MEMS rotary reflecting mirror 6, and finally, an optical signal is input from B11 of the first pair of optical fibers, and is output from Bn2 of the last pair of optical fibers, compared with the previous B11 input optical signal, the B12 output optical signal realizes primary filtering, the B11 input and the Bn2 output are equivalent to n times of cascading of filtering functions, the narrowing of the bandwidth of the filter and the improvement of the resolution are obviously realized, meanwhile, the collimating lens 3, the grating 4, the quarter wave plate 5 and the MEMS rotary reflecting mirror 6 are repeatedly shared by n times in the process, and the cost is effectively controlled without adding additional collimating lens 3, grating 4, quarter wave plate 5 and MEMS rotary reflecting mirror 6 while the n times of cascading of filtering functions are realized.
Embodiment two:
referring to fig. 3, on the basis of the first embodiment, the present invention provides a technical solution: the side of the collimating lens 3, which is far away from the n pairs of optical fibers 1, is provided with a plurality of grating cascade grating groups 7, one side of the plurality of grating cascade grating groups 7, which is far away from the collimating lens 3, is provided with a quarter wave plate 5, and one side of the quarter wave plate 5, which is far away from the plurality of grating cascade grating groups 7, is provided with an MEMS rotary reflecting mirror 6.
In this embodiment, the single-chip grating 4 is replaced by the multi-chip grating cascade grating group 7, and the multi-chip grating cascade grating group 7 can narrow the bandwidth of the filter and improve the resolution relative to the single-chip grating 4.
Embodiment III:
referring to fig. 4, on the basis of the first embodiment and the second embodiment, the present invention provides a technical solution: the n pairs of optical fibers 1 are arranged in parallel, and the n pairs of optical fibers 1 are mutually adhered and fixed, wherein the n pairs of optical fibers 1 are arranged in a two-dimensional mode with symmetrical optical axes, and the previous two-dimensional optical fiber arrangement mode is replaced by a one-dimensional optical fiber arrangement mode.
In this embodiment, the specific one-dimensional optical fiber arrangement implementation manner may be simple optical fiber parallel bonding, specific groove positioning, one-dimensional sleeve positioning or other equivalent fixing manners, and the optical fiber pairs B11 and B12, B21 and B22 … … Bn1 and Bn2 are symmetrically arranged with the system optical axes A1-A2.
Working principle:
when the optical fiber is used, firstly, an input optical signal is transmitted to the collimating lens 3 through the optical fiber B11, the collimating lens 3 collimates divergent light transmitted by the optical fiber, after the divergent light is collimated, the optical signal is incident to the grating 4, due to diffraction effect of the grating, light emergent angles of different wavelengths after passing through the grating are different, the light signals of different angles, namely different wavelengths, after passing through the grating are transmitted to the quarter wave plate 5, the effect of the quarter wave plate 5 is to adjust polarization-related loss PDL of the whole filter, the light signals reach the MEMS rotary reflecting mirror 6 after passing through the quarter wave plate 5, the MEMS rotary reflecting mirror 6 reflects the light signals back to the quarter wave plate 5, the grating 4, the collimating lens 3 and the optical fiber in the optical fiber sleeve 2, the reflecting angle of the MEMS rotary reflecting mirror 6 is adjusted, so that the light signals of required wavelengths are output from the B12, namely, the filtering function is realized, and the angle of the reflecting mirror is changed, namely the wavelength of the output light signals is changed;
each pair of optical fibers Bi1-Bi21 +.i +.n passes through a filtering system consisting of a collimating lens 3, a grating 4, a quarter wave plate 5 and an MEMS rotary reflecting mirror 6, and finally an optical signal is input from a B11 of the first pair of optical fibers, and is output from a Bn2 of the last pair of optical fibers, compared with the previous B11 input optical signal, the B12 output optical signal realizes primary filtering, the B11 input and the Bn2 output are equivalent to n times of cascading filtering functions, and the bandwidth narrowing and the resolution improvement of the filter are obviously realized.
Claims (7)
1. The utility model provides a tunable filter of optic fibre wavelength, includes a plurality of pairs n to optic fibre (1), fiber optic ferrule (2), collimating lens (3), grating (4), quarter wave plate (5) and MEMS rotary mirror (6), its characterized in that: the optical fiber collimator is characterized in that an optical fiber sleeve (2) is sleeved on the outer wall of the n pair of optical fibers (1), a collimating lens (3) is arranged on one side of the n pair of optical fibers (1), a grating (4) is arranged on one side of the collimating lens (3) away from the n pair of optical fibers (1), a quarter wave plate (5) is arranged on one side of the grating (4) away from the collimating lens (3), and an MEMS rotary reflecting mirror (6) is arranged on one side of the quarter wave plate (5) away from the grating (4);
the outer wall of the n pair of optical fibers (1) and the inner wall of the optical fiber sleeve (2) are mutually adhered and fixed through glue, the end face of one side, adhered to the optical fiber sleeve (2), of the n pair of optical fibers (1) is polished, and an antireflection film is plated on the end face.
2. A fiber wavelength tunable filter according to claim 1, wherein: each n pairs of optical fibers (1) are axisymmetrically arranged by taking the optical axis of the collimating lens (3) as a central axis, and adjacent n pairs of optical fibers (1) are connected in sequence.
3. A fiber wavelength tunable filter according to claim 1, wherein: b11 and B12 in the n pairs of optical fibers (1) form a pair of input optical fibers and output optical fibers.
4. A fiber wavelength tunable filter according to claim 1, wherein: the collimating lens (3) may be a single spherical lens, an aspherical lens, a graded index lens or other collimating function lens, or a combination of multiple lenses.
5. A fiber wavelength tunable filter according to claim 1, wherein: the MEMS rotary mirror (6) can be realized by an electric driving rotary mirror, a motor rotary mirror or a manual rotary mirror.
6. A fiber wavelength tunable filter according to claim 1, wherein: a plurality of grating cascade grating groups (7) are arranged on one side, away from the optical fiber (1), of the collimating lens (3), a quarter wave plate (5) is arranged on one side, away from the collimating lens (3), of the plurality of grating cascade grating groups (7), and an MEMS rotary reflecting mirror (6) is arranged on one side, away from the plurality of grating cascade grating groups (7), of the quarter wave plate (5).
7. The fiber wavelength tunable filter of claim 6, wherein: the n pairs of optical fibers (1) are arranged in parallel, and the n pairs of optical fibers (1) are mutually adhered and fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310259854.0A CN116107033A (en) | 2023-03-09 | 2023-03-09 | Optical fiber wavelength tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310259854.0A CN116107033A (en) | 2023-03-09 | 2023-03-09 | Optical fiber wavelength tunable filter |
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| Publication Number | Publication Date |
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| CN116107033A true CN116107033A (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310259854.0A Withdrawn CN116107033A (en) | 2023-03-09 | 2023-03-09 | Optical fiber wavelength tunable filter |
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2023
- 2023-03-09 CN CN202310259854.0A patent/CN116107033A/en not_active Withdrawn
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Application publication date: 20230512 |