CN113204149A - Optical fiber integrated optical switch, manufacturing method and optical switching method - Google Patents
Optical fiber integrated optical switch, manufacturing method and optical switching method Download PDFInfo
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- CN113204149A CN113204149A CN202110422920.2A CN202110422920A CN113204149A CN 113204149 A CN113204149 A CN 113204149A CN 202110422920 A CN202110422920 A CN 202110422920A CN 113204149 A CN113204149 A CN 113204149A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 201
- 230000003287 optical effect Effects 0.000 title claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 71
- 239000010408 film Substances 0.000 claims abstract description 70
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000010409 thin film Substances 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 238000005253 cladding Methods 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000013459 approach Methods 0.000 claims description 7
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims description 4
- 238000000411 transmission spectrum Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000007747 plating Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- 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
- G02F1/21—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 by interference
- G02F1/225—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 by interference in an optical waveguide structure
- G02F1/2252—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 by interference in an optical waveguide structure in optical fibres
Abstract
The invention discloses an optical fiber integrated optical switch, a manufacturing method of the optical switch and a method for realizing the switch by using the optical switch; wherein the optical fiber integrated optical switch includes: the Fabry-Perot cavity comprises an incident optical fiber and an emergent optical fiber, wherein the incident optical fiber and the emergent optical fiber are coaxial and have opposite end faces, the end faces, opposite to the incident optical fiber and the emergent optical fiber, of the incident optical fiber are respectively plated with a first reflecting film and a second reflecting film, and a gap is formed between the incident optical fiber and the emergent optical fiber to form a Fabry-Perot cavity; a lithium niobate crystal thin film is arranged on the first reflecting film or the second reflecting film or in the Fabry-Perot cavity and covers the fiber core area of the incident optical fiber; and voltage from the incident light fiber side to the emergent light fiber side is applied to two sides of the lithium niobate crystal film. The cavity length of the Fabry-Perot cavity is changed by changing the external voltage, so that the transmission spectrum is changed, and the function of an optical switch is realized.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to an optical fiber integrated optical switch, a manufacturing method of the optical switch and a method for realizing switching by using the optical switch.
Background
The optical switch is a device capable of controlling the on-off of optical signals in a transmission path or performing an optical path switching function, and can enable optical paths to be directly exchanged. Optical switches are necessarily adopted to realize routing of optical signals with different wavelengths in a network, and the optical switches can realize switching of optical beams on time, space and wavelength.
According to different principles, there are many ways to implement optical switches, such as traditional mechanical optical switches, micromechanical optical switches, liquid crystal optical switches, thermo-optical switches, electro-optical switches, and acousto-optical switches. In these conventional optical switches, the development of optical networks is restricted due to the defects of large size, complex principle, high cost, etc. How to manufacture an optical switch with low cost, small size and simple structure is very important for the development of an optical network.
The optical fiber has the advantages of low cost, strong noise resistance, small size and the like, so that the optical fiber optical switch can perfectly realize the butt joint of optical paths in an all-optical network.
The lithium niobate crystal has a plurality of photoelectric effects, and has a plurality of photoelectric properties including piezoelectric effect, electrooptical effect, nonlinear optical effect, photorefractive effect, photovoltaic effect, photoelastic effect, acousto-optic effect and the like, and the lithium niobate crystal has strong performance controllability, rich raw materials, capability of preparing high-quality large-size crystals, stable physicochemical properties, easy processing, wide light transmission range and larger birefringence. Due to these advantages, optoelectronic devices such as optical modulators, phase modulators, optical isolators and the like based on lithium niobate crystals have been widely researched and practically applied in the fields of electronic technology, optical communication technology and the like.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an optical fiber integrated optical switch, which changes the cavity length of a Fabry-Perot cavity through an external electric field, thereby changing a transmission spectrum and realizing the action of the optical switch. The optical switch provided by the invention is simple to manufacture, low in price, capable of being integrated with optical fibers and easy to popularize and apply.
The technical scheme is as follows: in one aspect, the present invention discloses an optical fiber integrated optical switch, including: the Fabry-Perot optical fiber comprises an incident optical fiber 1 and an emergent optical fiber 2, wherein the incident optical fiber 1 and the emergent optical fiber 2 are coaxial and have opposite end faces, the end faces, opposite to the incident optical fiber 1 and the emergent optical fiber 2, of the incident optical fiber 1 are respectively plated with a first reflecting film 3 and a second reflecting film 4, and a gap is formed between the incident optical fiber 1 and the emergent optical fiber 2 to form a Fabry-Perot cavity; a lithium niobate crystal thin film 5 is arranged on the first reflecting film 3 or the second reflecting film 4 or in the Fabry-Perot cavity, and the lithium niobate crystal thin film 5 covers the fiber core area of the incident optical fiber 1; a voltage is applied from the incident optical fiber 1 side to the exit optical fiber 2 side to both sides of the lithium niobate crystal thin film 5.
On the other hand, the invention also discloses a manufacturing method of the optical switch, which comprises the following steps:
a1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer as an incident optical fiber 1; taking the optical fiber with the same end face as the incident optical fiber 1 plated with a reflecting film as an emergent optical fiber 2;
adhering a lithium niobate crystal thin film 5 to the end face of the reflection film plated on the incident optical fiber 1 by using ultraviolet curing glue, wherein the lithium niobate crystal thin film 5 covers the fiber core area of the incident optical fiber 1; or the lithium niobate crystal film 5 is adhered to the end face of the reflection film plating of the outgoing optical fiber 2; the lithium niobate crystal film 5 covers the core area of the emergent optical fiber 2;
two microelectrodes are respectively plated on two sides of the lithium niobate crystal thin film 5;
a2, placing two optical fibers on a v-shaped groove of an optical fiber alignment fixture, wherein the end faces of the coated reflecting films are opposite, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
a3, connecting the positive pole and the negative pole of the power supply 8 to the microelectrode of the lithium niobate crystal thin film 5 near the incident optical fiber 1 and the microelectrode near the emergent optical fiber 2.
On the other hand, the invention also discloses a method for realizing the switch by utilizing the optical fiber integrated optical switch, which comprises the following steps:
(1) incident light enters from one end, close to the incident optical fiber 1, of the Fabry-Perot cavity, passes through the lithium niobate crystal film 5, is output from one end, close to the emergent optical fiber 2, of the Fabry-Perot cavity, the frequency of the incident light is fixed, and the voltage on two sides of the lithium niobate crystal film 5 is adjusted, so that the light intensity output from the Fabry-Perot cavity by the incident light is maximum, and the on state of the integrated optical switch is realized;
(2) the voltage at the two sides of the lithium niobate crystal film 5 is adjusted to ensure that the light intensity output by the Fabry-Perot cavity is minimum, thereby realizing the off state of the integrated optical switch.
Has the advantages that: the invention discloses an optical fiber integrated optical switch, which has the following advantages: 1. the lithium niobate crystal has large electro-optic coefficient, is not easy to deliquesce, has lower absorption coefficient and insertion loss, and has rich raw materials; 2. the optical switch with the optical fiber micro-cavity structure has the advantages of simple structure, small size, low manufacturing cost and good repeatability, and can realize optical path control of optical fiber integration.
Drawings
Fig. 1 is an optical fiber integrated optical switch disclosed in embodiment 1;
fig. 2 is an optical fiber integrated optical switch disclosed in embodiment 2;
fig. 3 is an optical fiber integrated optical switch disclosed in embodiment 3.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
Example 1:
the invention discloses an optical fiber integrated optical switch, as shown in fig. 1, comprising: the optical fiber comprises an incident optical fiber 1 and an emergent optical fiber 2, wherein the incident optical fiber 1 and the emergent optical fiber 2 are coaxial and have opposite end faces, and the opposite end faces are an end face 1-2 and an end face 2-1 in the figure respectively; the end face 1-2 and the end face 2-1 are respectively plated with a first reflecting film 3 and a second reflecting film 4, and in the embodiment, the first reflecting film 3 and the second reflecting film 4 are both reflecting films formed by overlapping silicon dioxide and tantalum pentoxide; the reflecting film can be formed by overlapping a layer of silicon dioxide and a layer of tantalum pentoxide, or can be formed by alternately overlapping a plurality of layers of silicon dioxide and a plurality of layers of tantalum pentoxide to form a periodic structure. A gap exists between the incident optical fiber 1 and the emergent optical fiber 2 to form a Fabry-Perot (F-P) cavity, namely a Fabry-Perot cavity; a lithium niobate crystal thin film 5 is arranged on the first reflecting film 3 or the second reflecting film 4 or in the Fabry-Perot cavity, the lithium niobate crystal thin film 5 covers the core area of the incident optical fiber 1, and voltage from the incident optical fiber side to the emergent optical fiber side is applied to two sides of the lithium niobate crystal thin film 5, namely the voltage of the lithium niobate crystal thin film 5 close to the incident optical fiber side is greater than the voltage close to the emergent optical fiber side. In fig. 1, a lithium niobate crystal thin film 5 is provided on a first reflective film 3; the voltage is generated by the power supply 8. And microelectrodes are adhered to two sides of the lithium niobate crystal thin film 5, wherein the microelectrode 6 is connected with the positive electrode of a power supply 8, and the microelectrode 7 is connected with the negative electrode of the power supply 8. In this example, the microelectrodes 6 and 7 were spun using carbon nanotubes.
The method for realizing the switch by adopting the optical fiber integrated optical switch comprises the following steps:
incident light enters the F-P cavity from the end face 1-1 of the incident optical fiber 1 through the end face 1-2, is reflected for multiple times between the first reflecting film 3 and the second reflecting film 4, passes through the lithium niobate crystal thin film 5 in sequence every time of reflection, and then is output through the end face 2-2 of the emergent optical fiber. According to the electro-optic effect of the lithium niobate crystal, the refractive index of the lithium niobate crystal film can be changed by changing the output voltage of the power supply 8, namely changing the voltage at two sides of the lithium niobate crystal film 5, so that the effective cavity length of the whole optical fiber F-P cavity is changed. Based on the propagation principle of light in the F-P cavity, the F-P cavity has different light transmittances for different frequencies, and the light meeting the resonance condition can have the maximum transmittance. Therefore, along with the change of the effective cavity length of the optical fiber F-P, the optical frequency capable of achieving resonance with the optical fiber F-P changes, so that the transmission of the incident light coupled to the emergent optical fiber through the F-P cavity changes, and the function of an optical switch is further realized. Therefore, the frequency of incident light is fixed, and the voltage on two sides of the lithium niobate crystal thin film 5 is adjusted, so that the light intensity output by the incident light from the Fabry-Perot cavity is maximum, and the on state of the integrated optical switch is realized; the voltage at the two sides of the lithium niobate crystal film 5 is adjusted to ensure that the light intensity output by the Fabry-Perot cavity is minimum, thereby realizing the off state of the integrated optical switch.
The manufacturing method of the optical fiber integrated optical switch in the embodiment includes:
a1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer as an incident optical fiber 1; taking the optical fiber with the same end face as the incident optical fiber 1 plated with a reflecting film as an emergent optical fiber 2;
adhering a lithium niobate crystal thin film 5 to the end face 1-2 of the incident optical fiber 1 coated with the reflecting film by using ultraviolet curing glue, wherein the lithium niobate crystal thin film 5 covers the fiber core area of the incident optical fiber 1; two microelectrodes 6 and 7 are respectively plated on two sides of the lithium niobate crystal thin film 5;
a2, placing two optical fibers on a v-shaped groove of an optical fiber alignment fixture, plating the end face of a reflecting film, namely the end face 1-2 is opposite to the end face 2-1, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
a3, connecting the positive pole and the negative pole of the power supply 8 to the microelectrode 6 and the microelectrode 7 on the lithium niobate crystal thin film 5 respectively.
Example 2:
the optical fiber integrated optical switch disclosed in this embodiment is different from the optical fiber integrated optical switch in embodiment 1 in that: the positive pole and the negative pole of the power supply 8 are respectively connected with the cladding regions of the opposite end surfaces of the incident optical fiber 1 and the emergent optical fiber 2, namely, the microelectrode 6 is plated on the cladding region of the end surface 1-2 of the incident optical fiber 1, and the microelectrode 7 is plated on the cladding region of the end surface 2-1 of the emergent optical fiber 2, as shown in figure 2. The anode and the cathode of a power supply 8 are connected with the microelectrodes 6 and 7, and the voltage at two sides of the lithium niobate crystal thin film 5 is adjusted by adjusting the output voltage of the power supply 8, so that the refractive index of the lithium niobate crystal thin film is changed, and further the cavity length of the optical fiber F-P cavity is changed.
The manufacturing method of the optical fiber integrated optical switch in the embodiment comprises the following steps:
b1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer to serve as an incident optical fiber 1; taking the optical fiber with the same end face as the incident optical fiber 1 plated with a reflecting film as an emergent optical fiber 2;
adhering a lithium niobate crystal thin film 5 to the end face 1-2 of the incident optical fiber 1 coated with the reflecting film by using ultraviolet curing glue, wherein the lithium niobate crystal thin film 5 covers the fiber core area of the incident optical fiber 1;
plating two microelectrodes 6 and 7 on the cladding region of the end surface 1-2 of the incident optical fiber 1 and the cladding region of the end surface 2-1 of the emergent optical fiber 2 respectively;
b2, placing the two optical fibers on a v-shaped groove of the optical fiber alignment fixture, plating the end face of the reflection film, namely the end face 1-2 is opposite to the end face 2-1, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
b3, connecting the positive electrode and the negative electrode of the power supply 8 to the microelectrodes 6 and 7, respectively.
Example 3:
the optical fiber integrated optical switch disclosed in this embodiment is different from the optical fiber integrated optical switch in embodiment 1 in that: the lithium niobate crystal thin film 5 is fixed on the glass substrate 9 adhered with the Fabry-Perot cavity, so that the lithium niobate crystal thin film is directly arranged in the Fabry-Perot cavity. As shown in fig. 3. The microelectrodes 6 and 7 are adhered to the lithium niobate crystal thin film 5, the anode and the cathode of the power supply 8 are connected with the microelectrodes 6 and 7, and the voltage at two sides of the lithium niobate crystal thin film 5 is adjusted by adjusting the output voltage of the power supply 8, so that the refractive index of the lithium niobate crystal thin film is changed, and further the cavity length of the optical fiber F-P cavity is changed. The microelectrodes 6 and 7 may be plated on the cladding regions of the opposite end faces of the incoming optical fiber 1 and the outgoing optical fiber 2, that is, the microelectrode 6 is plated on the cladding region of the end face 1-2 of the incoming optical fiber 1, and the microelectrode 7 is plated on the cladding region of the end face 2-1 of the outgoing optical fiber 2, at the same positions as those of the microelectrodes in example 2.
The manufacturing method of the optical fiber integrated optical switch in the embodiment comprises the following steps:
c1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer to serve as an incident optical fiber 1; taking the optical fiber with the same end face as the incident optical fiber 1 plated with a reflecting film as an emergent optical fiber 2;
c2, placing the two optical fibers on a v-shaped groove of the optical fiber alignment fixture, plating the end face of the reflection film, namely the end face 1-2 is opposite to the end face 2-1, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
the fabry-perot chamber is adhered to the glass substrate 9 by means of uv-curing glue.
C3, mounting the lithium niobate crystal thin film 5 by adopting one of the following two modes:
the first method is as follows: two microelectrodes 6 and 7 are respectively plated on two sides of a lithium niobate crystal thin film 5, the lithium niobate crystal thin film 5 is placed on a glass substrate in a Fabry-Perot cavity and covers a fiber core area of an incident optical fiber 1, and the lithium niobate crystal is adhered and fixed on the glass substrate 9 by using ultraviolet curing glue.
The second method comprises the following steps: two microelectrodes 6 and 7 are respectively plated on cladding regions of opposite end faces of the incident optical fiber 1 and the emergent optical fiber 2;
c4, connecting the positive pole and the negative pole of the power supply 8 to the microelectrodes 6 and 7, respectively.
Claims (10)
1. An optical fiber integrated optical switch, comprising: the Fabry-Perot optical fiber comprises an incident optical fiber (1) and an emergent optical fiber (2), wherein the incident optical fiber (1) and the emergent optical fiber (2) are coaxial and have opposite end faces, the opposite end faces of the incident optical fiber (1) and the emergent optical fiber (2) are respectively plated with a first reflecting film (3) and a second reflecting film (4), and a gap is formed between the incident optical fiber (1) and the emergent optical fiber (2) to form a Fabry-Perot cavity; a lithium niobate crystal thin film (5) is arranged on the first reflecting film (3) or the second reflecting film (4) or in the Fabry-Perot cavity, and the lithium niobate crystal thin film (5) covers the core area of the incident optical fiber (1); a voltage is applied from the incident optical fiber (1) side to the exit optical fiber (2) side to both sides of the lithium niobate crystal thin film (5).
2. The fiber-optic integrated optical switch according to claim 1, wherein the first reflective film (3) and the second reflective film (4) are both reflective films composed of a stack of silicon dioxide and tantalum pentoxide.
3. The optical fiber integrated optical switch according to claim 1, further comprising a power supply (8), wherein the positive electrode and the negative electrode of the power supply (8) are connected to the side of the lithium niobate crystal thin film (5) close to the incident optical fiber (1) and the side close to the exit optical fiber (2), respectively.
4. The fiber-integrated optical switch of claim 1, further comprising a power supply (8), wherein the positive and negative poles of the power supply (8) are connected to the cladding regions of the opposite end faces of the incoming fiber (1) and the outgoing fiber (2), respectively.
5. The fiber-integrated optical switch according to any one of claims 3 or 4, wherein the positive electrode and the negative electrode of the power supply (8) are connected to the lithium niobate crystal thin film (5) or the cladding region of the optical fiber through a micro-electrode.
6. The fiber-optic integrated optical switch of claim 1, wherein the Fabry-Perot cavity is adhered to a glass substrate (9), and the lithium niobate crystal thin film (5) is fixed on the glass substrate (9) in the Fabry-Perot cavity.
7. A method of manufacturing an optical fiber integrated optical switch for manufacturing the optical fiber integrated optical switch of claim 3, comprising:
a1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer as an incident optical fiber (1); taking the optical fiber with the same end face as the incident optical fiber (1) plated with a reflecting film as an emergent optical fiber (2);
adhering a lithium niobate crystal film (5) to the end face of the reflection film plated on the incident optical fiber (1) by using ultraviolet curing glue, wherein the lithium niobate crystal film (5) covers the core area of the incident optical fiber (1); or adhering a lithium niobate crystal thin film (5) on the end face of the reflection film plated of the outgoing optical fiber (2), wherein the lithium niobate crystal thin film (5) covers the core area of the outgoing optical fiber (2);
two microelectrodes are respectively plated on two sides of the lithium niobate crystal thin film (5);
a2, placing two optical fibers on a v-shaped groove of an optical fiber alignment fixture, wherein the end faces of the coated reflecting films are opposite, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
a3, connecting the positive pole and the negative pole of the power supply (8) to the microelectrode of the lithium niobate crystal thin film (5) near the incident optical fiber (1) and the microelectrode near the emergent optical fiber (2), respectively.
8. A method of manufacturing an optical fiber integrated optical switch for manufacturing the optical fiber integrated optical switch of claim 4, comprising:
b1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer to be used as an incident optical fiber (1); taking the optical fiber with the same end face as the incident optical fiber (1) plated with a reflecting film as an emergent optical fiber (2);
adhering a lithium niobate crystal film (5) to the end face of the reflection film plated on the incident optical fiber (1) by using ultraviolet curing glue, wherein the lithium niobate crystal film (5) covers the core area of the incident optical fiber (1); or the lithium niobate crystal thin film (5) is adhered to the end face of the plated reflecting film of the outgoing optical fiber (2); the lithium niobate crystal film (5) covers the core area of the emergent optical fiber (2);
two microelectrodes are respectively plated on cladding regions of opposite end faces of the incident optical fiber (1) and the emergent optical fiber (2);
b2, placing the two optical fibers on a v-shaped groove of an optical fiber alignment fixture, wherein the end faces of the plated reflecting films are opposite, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
b3, connecting the positive pole and the negative pole of the power supply (8) to the micro-electrodes of the cladding regions of the opposite end faces of the incident optical fiber (1) and the emergent optical fiber (2), respectively.
9. A method of manufacturing an optical fiber integrated optical switch for manufacturing the optical fiber integrated optical switch of claim 6, comprising:
c1, placing an optical fiber with an end face plated with a reflecting film on an optical fiber fixer to be used as an incident optical fiber (1); taking the optical fiber with the same end face as the incident optical fiber (1) plated with a reflecting film as an emergent optical fiber (2);
c2, placing the two optical fibers on a v-shaped groove of the optical fiber alignment fixture, wherein the end faces of the plated reflecting films are opposite, and driving the two optical fibers to align and approach to form a Fabry-Perot cavity by utilizing piezoelectric machinery;
the Fabry-Perot cavity is adhered to the glass substrate (9) by using ultraviolet curing glue;
c3, mounting the lithium niobate crystal thin film (5) by adopting one of the following two modes:
the first method is as follows: two microelectrodes (6) and (7) are respectively plated on two sides of a lithium niobate crystal thin film (5), then the lithium niobate crystal thin film (5) is placed on a glass substrate in a Fabry-Perot cavity and covers a fiber core area of an incident optical fiber (1), and the lithium niobate crystal is adhered and fixed on the glass substrate (9) by utilizing ultraviolet curing glue;
the second method comprises the following steps: two microelectrodes (6) and (7) are respectively plated on cladding regions of opposite end faces of the incident optical fiber (1) and the emergent optical fiber (2);
c4, connecting the positive electrode and the negative electrode of the power supply (8) to the microelectrodes (6) and (7), respectively.
10. An optical switching method based on the optical fiber integrated optical switch of claims 1-6, comprising:
(1) incident light enters from one end, close to the incident optical fiber (1), of the Fabry-Perot cavity, passes through the lithium niobate crystal thin film (5), is output from one end, close to the emergent optical fiber (2), of the Fabry-Perot cavity, the frequency of the incident light is fixed, and the voltage on two sides of the lithium niobate crystal thin film (5) is adjusted, so that the light intensity output from the Fabry-Perot cavity by the incident light is maximum, and the on state of the integrated optical switch is realized;
(2) the voltage at the two sides of the lithium niobate crystal film (5) is adjusted to ensure that the light intensity output by the incident light from the Fabry-Perot cavity is minimum, thereby realizing the off state of the integrated optical switch.
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