CN113031156A - Optical fiber mode field adapter with cladding power stripping function and preparation method thereof - Google Patents
Optical fiber mode field adapter with cladding power stripping function and preparation method thereof Download PDFInfo
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Abstract
The invention provides an optical fiber mode field adapter with a cladding power stripping function and a preparation method thereof, wherein the optical fiber mode field adapter comprises a fiber core mode field adapting area and an optical fiber cladding light stripping area, wherein the optical fiber cladding light stripping area is respectively arranged at the input end and the output end of the fiber core mode field adapting area; the invention greatly reduces the influence of cladding light on the fiber core mode field adaptation area, only requires that the diameter of the input end fiber base mode field is smaller than that of the output end fiber base mode field, gets rid of the limitation of the fiber mode field adapter on the fiber cladding diameter, and makes the mode field adapter with the diameter of the input end fiber cladding larger than that of the output end fiber cladding possible. The invention can also reduce the working temperature of the fusion point inside the MFA, reduce the pressure of devices before and after the MFA in the MOPA structure fiber laser and improve the system stability.
Description
Technical Field
The invention relates to the technical field of fiber laser, in particular to a fiber mode field adapter with a cladding power stripping function and a preparation method of the fiber mode field adapter with the cladding power stripping function.
Background
The application of high-power fiber laser in the fields of industrial processing, photoelectric countermeasure and the like is more and more extensive, at present, the scheme of realizing high power and high beam quality output through a Master Oscillator Power Amplifier (MOPA) structure is widely adopted, an initial laser seed source of the fiber laser outputs in a single mode or a quasi-single mode, and the amplification is carried out in an optical fiber with a larger fiber core size at the rear stage so as to reduce the influence of nonlinear effect and obtain higher power.
In an amplification system, in order to solve the problem of fusion loss of optical fibers with different mode field diameters, a mode-field adapter (MFA) is added between two stages, so that the loss of laser output by a front-stage fiber core entering a rear-stage fiber core is reduced, the excitation of a high-order mode in the rear-stage fiber is reduced, and the coupling efficiency of the fiber core light between the two stages is improved. At present, the optical fiber mode field adapter is mainly manufactured by an optical fiber heating core expanding technology and an optical fiber tapering technology.
In order to reduce cladding light leakage, the cladding diameter of optical fibers at two ends of a fusion point in the optical fiber mode field adapter needs to be matched. As described in chinese patent application No. 201210320456.7 (application publication No. CN 102866462A), it is required that the outer diameter of the thermal expansion core fiber cladding is equal to the outer diameter of the laser output end fiber cladding, and the outer diameter of the tapered small-aperture cladding is equal to the outer diameter of the laser output end fiber cladding; chinese patent application No. 201811191148.2 (application publication No. CN 111045151 a) requires that the cladding diameter of the output fiber is larger than that of the input fiber, and the ratio of the cladding diameter of the output fiber to that of the input fiber is larger than that of the core diameter of the output fiber to that of the input fiber, so that the output fiber needs to be accurately etched and tapered. If the corrosion on the fiber cladding is not uniform, the coaxiality of the fiber core and the cladding after corrosion is reduced, the fusion loss of the fiber is increased, and the loss of a mode field adapter is increased.
In practical applications, the cladding diameter of the input end fiber is often larger than or equal to that of the output end fiber, and the transmission direction of the cladding light may be from the front stage to the rear stage, or the backward pump light residue of the amplifier stage may be transmitted from the rear stage to the front stage. When the cladding light passes through the mode field adapter, a part of the cladding light is converted into heat, so that pressure is caused to the device, even the inside of the device is blown, and the laser is damaged.
On the other hand, when laser output from the front stage enters the rear stage through the fiber mode field adapter, due to the influence of factors such as welding and processing technology, part of fiber core light always enters the cladding of the output fiber, if the fiber core light is not processed, certain influence can be caused on devices of the rear stage, and the devices of the rear stage can be damaged in serious cases.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an optical fiber mode field adapter with a cladding power stripping function.
In order to achieve the purpose, the invention adopts the following technical scheme:
the optical fiber mode field adapter with the cladding power stripping function comprises a fiber core mode field adapting area and a fiber cladding light stripping area, wherein the fiber cladding light stripping area is arranged at the input end and the output end of the fiber core mode field adapting area respectively.
In one embodiment, the fiber cladding light stripping region includes an input end fiber cladding light stripping region and an output end fiber cladding light stripping region, and the input end fiber cladding light stripping region and the output end fiber cladding light stripping region are respectively arranged at the input end and the output end of the fiber core mode field adapting region.
In one embodiment, the input end fiber cladding light stripping region comprises an input end fiber cladding light stripping region core, an input end fiber cladding light stripping region cladding and a first cladding light stripping region; the output end optical fiber cladding light stripping area comprises an output end optical fiber cladding light stripping area fiber core, an output end optical fiber cladding light stripping area cladding and a second cladding light stripping area.
In one embodiment, the core mode field adaptation region comprises an input optical fiber, a mode field adapter cone waist region, a mode field adapter transition region and an output optical fiber, the input optical fiber, the mode field adapter cone waist region, the mode field adapter transition region and the output optical fiber are sequentially connected end to end, the input end optical fiber cladding light stripping region is connected with the input optical fiber, and the output end optical fiber cladding light stripping region is connected with the output optical fiber.
In one embodiment, the input fiber comprises an input fiber core and an input fiber cladding;
the mode field adapter cone waist area comprises a cone waist area fiber core and a cone waist area cladding;
the mode field adapter transition region comprises a transition region fiber core and a transition region cladding;
the output fiber includes an output fiber core and an output fiber cladding.
In one embodiment, the input end fiber cladding light stripping area is formed by processing the input fiber, and the core of the input end fiber cladding light stripping area and the core of the input fiber have the same core diameter and numerical aperture.
In one embodiment, the output fiber cladding light stripping area is formed by processing a large-core output fiber, and the core of the output fiber cladding light stripping area and the core of the output fiber have the same core diameter and numerical aperture.
In one embodiment, the mode field adapter taper waist region and the mode field adapter transition region are formed by fusion tapering of a large-core output fiber, and the numerical aperture of the core of the taper waist region and the core of the transition region is the same as that of the core of the output fiber.
In one embodiment, the diameter of the output fiber core is larger than the diameter of the input fiber core.
The invention also provides a preparation method of the fiber mode field adapter with the cladding power stripping function, which comprises the following steps:
preparing an input optical fiber and an output optical fiber, wherein the core diameter of the output optical fiber is larger than that of the input optical fiber;
secondly, calculating the mode field diameter of the input optical fiber according to the parameter requirements of the input optical fiber and the output optical fiber, wherein the parameter requirements comprise the numerical aperture and the fiber core diameter of the input optical fiber, the numerical aperture and the fiber core diameter of the output optical fiber and the working wavelength of a device;
in the formula, NA is the numerical aperture of the optical fiber, V is the value of the optical fiber V, D represents the diameter of the fiber core, omega is the diameter of the mode field of the optical fiber, and lambda is the working wavelength of the device; calculating the diameter of the fiber core in the cone waist region of the mode field adapter under the condition that the diameter of the mode field of the optical fiber in the cone waist region of the mode field adapter is equal to the diameter of the mode field of the input optical fiber;
thirdly, calculating parameters required by tapering the output optical fiber according to the calculated diameter of the fiber core in the conical waist area, further performing fused tapering on the output optical fiber to form a conical waist area of the mode field adapter and a transition area of the mode field adapter, and enabling the mode field diameter of the optical fiber in the conical waist area of the mode field adapter to be equal to the mode field diameter of the input optical fiber;
fourthly, welding the mode field adapter taper waist region formed by tapering the input optical fiber and the output optical fiber;
fifthly, preparing an input end optical fiber cladding light stripping area and an output end optical fiber cladding light stripping area on the input optical fiber and the output optical fiber respectively;
and sixthly, packaging by using a glass sleeve: the length of the input optical fiber and the length of the output optical fiber are 1-2 cm, and the input end optical fiber cladding light stripping area, the input optical fiber, the mode field adapter taper waist area, the mode field adapter transition area, the output optical fiber and the output end optical fiber cladding light stripping area are integrated together and packaged in a glass sleeve;
or the following steps: the lengths of the input optical fiber and the output optical fiber are respectively greater than 6cm, the input end optical fiber cladding light stripping area and the output end optical fiber cladding light stripping area are respectively packaged, and the input optical fiber, the mode field adapter cone waist area, the mode field adapter transition area and the output optical fiber are packaged together;
or the following steps: the input end optical fiber cladding light stripping area, the input optical fiber, the mode field adapter taper waist area, the mode field adapter transition area and the output optical fiber are packaged together, and the output end optical fiber cladding light stripping area is packaged independently;
or the following steps: the input end optical fiber cladding light stripping area is packaged independently, and the input optical fiber, the mode field adapter cone waist area, the mode field adapter transition area, the output optical fiber and the output end optical fiber cladding light stripping area are packaged together.
Compared with the prior art, the optical fiber mode field adapter with the cladding power stripping function and the preparation method thereof provided by the invention have the following advantages:
firstly, the invention greatly reduces the influence of cladding light on the fiber core mode field adaptation area, only requires that the diameter of the input end fiber base mode field is smaller than that of the output end fiber base mode field, gets rid of the limitation of the fiber mode field adapter on the fiber cladding diameter, and makes the mode field adapter with the diameter of the input end fiber cladding larger than that of the output end fiber cladding possible. The invention can also reduce the working temperature of the fusion point inside the MFA, reduce the pressure of devices before and after the MFA in the MOPA structure fiber laser and improve the system stability.
Secondly, after the invention gets rid of the limitation of the fiber mode field adapter on the diameter of the fiber cladding, the input or output fiber cladding does not need to be accurately corroded in the manufacturing method, and the difficulty of the manufacturing process is reduced.
Third, if separate cladding light strippers are fused to both ends of the fiber mode field adapter, the following problems arise: on one hand, the optical fibers of each separating device need a certain length for fusion welding, which results in overlong optical fibers at the output end, and the strength of the nonlinear effect is in direct proportion to the length of the laser transmission optical fiber, which is inevitably not beneficial to the inhibition of the nonlinear effect; on the other hand, welding of separate devices also causes welding loss and mode coupling, resulting in poor laser efficiency and beam quality. The invention integrates the cladding light stripper and the optical fiber mode field adapter, shortens the length of the whole optical fiber, reduces the times of fusion welding between the optical fibers of the separation device and effectively avoids the problems.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The optical fiber mode field adapter with the cladding power stripping function comprises a fiber core mode field adapting area 100 and a fiber cladding light stripping area, wherein the fiber cladding light stripping area is respectively arranged at the input end and the output end of the fiber core mode field adapting area 100.
In this embodiment, the optical fiber cladding light stripping area includes an input end optical fiber cladding light stripping area 1 and an output end optical fiber cladding light stripping area 6, and the input end optical fiber cladding light stripping area 1 and the output end optical fiber cladding light stripping area 6 are respectively disposed at the input end and the output end of the core mode field adaptation area 100.
Specifically, the input end optical fiber cladding light stripping area 1 comprises an input end optical fiber cladding light stripping area fiber core 11, an input end optical fiber cladding light stripping area cladding 12 and a first cladding light stripping area 13; the output-side fiber cladding light stripping region 6 includes an output-side fiber cladding light stripping region core 61, an output-side fiber cladding light stripping region cladding 62, and a second cladding light stripping region 63.
In this embodiment, the core mode field adaptation region 100 includes an input fiber 2, a mode field adapter cone waist region 3, a mode field adapter transition region 4, and an output fiber 5, where the input fiber 2, the mode field adapter cone waist region 3, the mode field adapter transition region 4, and the output fiber 5 are sequentially connected end to end, the input end fiber cladding light stripping region 1 is connected with the input fiber 2, and the output end fiber cladding light stripping region 6 is connected with the output fiber 5.
Specifically, the input fiber 2 includes an input fiber core 21 and an input fiber cladding 22;
mode field adapter taper waist region 3 includes a taper waist region core 31 and a taper waist region cladding 32;
the mode field adapter transition region 4 comprises a transition region fiber core 41 and a transition region cladding 42;
the output fiber 5 includes an output fiber core 51 and an output fiber cladding 52.
Preferably, the input end fiber cladding light stripping region 1 is formed by processing the input fiber 2, and the input end fiber cladding light stripping region core 11 and the input fiber core 21 have the same core diameter and numerical aperture.
Preferably, the output fiber cladding light stripping region 6 and the output fiber 5 are respectively formed by processing a large-core output fiber, and the core 61 of the output fiber cladding light stripping region and the core 51 of the output fiber have the same core diameter and numerical aperture.
Preferably, the mode field adapter taper waist region 3 and the mode field adapter transition region 4 are respectively formed by fusion tapering of a large-core output fiber, and the numerical apertures of the taper waist region fiber core 31 and the transition region fiber core 41 are the same as those of the output fiber core 51.
Preferably, the diameter of the output fiber core 51 is larger than the diameter of the input fiber core 21.
The invention also provides a preparation method of the fiber mode field adapter with the cladding power stripping function, which comprises the following steps:
firstly, preparing an input optical fiber 2 and an output optical fiber 5, wherein the core diameter of the output optical fiber 5 is larger than that of the input optical fiber 2;
secondly, according to the parameter requirements of the input optical fiber 2 and the output optical fiber 5, the numerical aperture NA1 and the fiber core diameter D1 of the input optical fiber 2, the numerical aperture NA2 and the fiber core diameter D2 of the output optical fiber 5 and the working wavelength lambda of a device are included, and the mode field diameter omega of the input optical fiber is calculated by the following formula;
in the formula, NA is the numerical aperture of the optical fiber, V is the value of the optical fiber V, D represents the diameter of the fiber core, omega is the diameter of the mode field of the optical fiber, and lambda is the working wavelength of the device; calculating the diameter of the fiber core in the mode field adapter cone waist region 3 according to the condition that the diameter of the mode field of the optical fiber in the mode field adapter cone waist region 3 is equal to the diameter of the mode field of the input optical fiber 2;
thirdly, calculating parameters required by tapering the output optical fiber 5 according to the calculated diameter of the fiber core 31 in the tapered waist area, further performing fused tapering on the output optical fiber 5 to form a tapered waist area 3 of the mode field adapter and a transition area 4 of the mode field adapter, and enabling the mode field diameter of the optical fiber in the tapered waist area 3 of the mode field adapter to be equal to the mode field diameter of the input optical fiber 2;
fourthly, welding the mode field adapter taper waist region 3 formed by tapering the input optical fiber 2 and the output optical fiber 5;
fifthly, preparing an input end optical fiber cladding light stripping area 1 and an output end optical fiber cladding light stripping area 6 on the input optical fiber 2 and the output optical fiber 5 respectively, wherein the cladding power attenuation coefficient is 10-30 dB;
and sixthly, packaging by using a glass sleeve: the length of the input optical fiber 2 and the length of the output optical fiber 5 are 1-2 cm, an input end optical fiber cladding light stripping area 1, the input optical fiber 2, a mode field adapter cone waist area 3, a mode field adapter transition area 4, the output optical fiber 5 and an output end optical fiber cladding light stripping area 6 are integrated together, and the integrated optical fiber is packaged in a glass sleeve;
or the following steps: the lengths of the input optical fiber 2 and the output optical fiber 5 are respectively greater than 6cm, the input end optical fiber cladding light stripping area 1 and the output end optical fiber cladding light stripping area 6 are respectively packaged, and the input optical fiber 2, the mode field adapter cone waist area 3, the mode field adapter transition area 4 and the output optical fiber 5 are packaged together;
or the following steps: the input end optical fiber cladding light stripping area 1, the input optical fiber 2, the mode field adapter cone waist area 3, the mode field adapter transition area 4 and the output optical fiber 5 are packaged together, and the output end optical fiber cladding light stripping area 6 is packaged independently;
or the following steps: input end fiber cladding light stripping region 1 is packaged separately, and input fiber 2, mode field adapter cone waist region 3, mode field adapter transition region 4, output fiber 5 and output end fiber cladding light stripping region 6 are packaged together.
Further, before the tapered output optical fiber 5 and the input optical fiber 2 are fusion-spliced, the tapered output optical fiber 5 needs to be cut and flattened, so as to reduce fusion-splicing loss between the tapered output optical fiber 5 and the input optical fiber 2.
Furthermore, after the tapered output optical fiber 5 and the input optical fiber 2 are welded, the welded part needs to be further fired, so that the welding loss is smaller; specifically, the further firing method specifically comprises the following steps: the optical fiber fusion-tapering machine is illuminated and monitored by a power meter, then fired, and the firing is stopped when a predetermined fusion loss is reached.
The preparation method of the optical fiber mode field adapter with the cladding power stripping function has the following advantages: the fiber core and cladding coaxiality reduction caused by uneven corrosion can be avoided by only considering the matching of the fiber core mode field areas of the output optical fiber 2 and the input optical fiber 5 after tapering and not accurately corroding the cladding of the input optical fiber 2 and the output optical fiber 5.
Comparative example:
the core and cladding diameters of the input fiber 2 are 10 μm and 130 μm, respectively, and NA 0.075, and the core and cladding diameters of the output fiber 5 are 25 μm and 400 μm, respectively, and NA 0.065. The mode field adapter is prepared by a conventional method, and the output end optical fiber is corroded and tapered to be accurately matched with the fiber core and the cladding of the input end optical fiber.
1) An input optical fiber 2 and an output optical fiber 5 were prepared, wherein the core diameter of the input optical fiber 2 was 10 μm, the cladding diameter of the input optical fiber was 130 μm, the core diameter of the output optical fiber 5 was 25 μm, and the cladding diameter of the output optical fiber was 400 μm. Stripping a section of outer cladding layer of the input optical fiber 2 close to the end face of the optical fiber, wherein the stripping length is not less than 10cm, and stripping a section of outer cladding layer of the output optical fiber 5 close to the middle position, wherein the stripping length is not less than 20 cm.
2) The working wavelength lambda of the device is determined to be 1080nm, and the diameter of the fiber core in the tapered waist region 3 of the mode field adapter is calculated to be about 9.9 mu m.
3) The inner cladding of the outer cladding stripped section of the output optical fiber 5 was etched with hydrofluoric acid of 15% concentration to etch the inner cladding diameter of the fiber from 400 μm to about 328 μm.
4) The etched intermediate section of the output optical fiber 5 was heated to melt at about 1400 c and the molten output optical fiber 5 was then tapered using a fiber fusion tapering machine such that the tapered mode field adapter cone waist region 3 had a core diameter of 9.9 μm and a cladding diameter of 130 μm.
5) The end face of an input optical fiber 2 is cut flat, an output optical fiber 5 after tapering is cut flat in a mode field adapter cone waist region 3, the input optical fiber 2 and the optical fiber in the mode field adapter cone waist region 3 are welded by an optical fiber welding machine, the pre-melting time is 0.5s, the welding discharge time is 3000ms, and the welding loss is ensured to be less than 0.1 dB.
6) The core mode field adaptation region 100 is encapsulated using a glass sleeve.
The first embodiment is as follows:
the core and cladding diameters of the input fiber 2 are 10 μm and 130 μm, respectively, and NA 0.075, and the core and cladding diameters of the output fiber 5 are 25 μm and 400 μm, respectively, and NA 0.065.
1) An input optical fiber 2 and an output optical fiber 5 were prepared, wherein the core diameter of the input optical fiber 2 was 10 μm, the cladding diameter of the input optical fiber was 130 μm, the core diameter of the output optical fiber 5 was 25 μm, and the cladding diameter of the output optical fiber was 400 μm. Stripping a section of outer cladding layer of the input optical fiber 2 close to the end face of the optical fiber, wherein the stripping length is not less than 10cm, and stripping a section of outer cladding layer of the output optical fiber 5 close to the middle position, wherein the stripping length is not less than 20 cm.
2) The working wavelength lambda of the device is determined to be 1080nm, and the diameter of the fiber core in the tapered waist region 3 of the mode field adapter is calculated to be about 9.9 mu m.
3) The central section of the overclad removed output fiber 5 was heated to melt at about 1400 c and the molten output fiber 5 was then tapered using a fiber fusion tapering machine so that the core diameter of the tapered mode field adapter waist region 3 was 9.9 μm and the taper waist region cladding diameter was about 158 μm.
4) The end face of an input optical fiber 2 is cut flat, an output optical fiber 5 after tapering is cut flat in a mode field adapter cone waist region 3, the input optical fiber 2 and the optical fiber in the mode field adapter cone waist region 3 are welded by an optical fiber welding machine, the pre-melting time is 0.5s, the welding discharge time is 4000ms, the discharge center deviates 3 micrometers to one side of the optical fiber 5, and the welding loss is ensured to be less than 0.1 dB.
5) The inner cladding of the input optical fiber 2 is corroded by using glass frosting paste to prepare an input end optical fiber cladding stripping area 1, hydrofluoric acid and acidic fluoride are contained in the glass frosting paste, the concentration of the hydrofluoric acid is 15%, and the corrosion time is 30 seconds, so that fluosilicate crystals generated by chemical reaction are firmly attached to the surface of the optical fiber cladding. The cladding light stripping area 1 of the input end optical fiber is 4cm in length of the corrosion area and is 4cm away from the fusion point of the input optical fiber 2 and the optical fiber in the mode field adapter cone waist area 3; and corroding the output optical fiber 5 by using glass frosting paste to prepare an output end optical fiber cladding light stripping area 6, wherein the length of the corrosion area is 4cm, and the distance from the input optical fiber 2 to the fusion point of the optical fiber in the cone waist area 3 of the mould field adapter is 4 cm.
6) And the input end optical fiber cladding light stripping area 1, the fiber core mode field adapting area 100 and the output end optical fiber cladding light stripping area 6 are encapsulated by using a glass sleeve.
Example two:
1) the core and cladding diameters of the input fiber 2 are 20 μm and 400 μm, respectively, and NA0.065, and the core and cladding diameters of the output fiber 5 are 25 μm and 400 μm, respectively, and NA 0.065. Stripping a section of outer cladding layer of the input optical fiber 2 close to the end face of the optical fiber, wherein the stripping length is not less than 10cm, and stripping a section of outer cladding layer of the output optical fiber 5 close to the middle position, wherein the stripping length is not less than 20 cm.
2) The working wavelength lambda of the device is determined to be 1080nm, and the diameter of the fiber core in the tapered waist region 3 of the mode field adapter is calculated to be about 20 mu m.
3) The central section of the overclad removed output fiber 5 was heated to melt at about 1400 c and the molten output fiber 5 was then tapered using a fiber fusion tapering machine such that the tapered mode field adapter taper waist region 3 had a core diameter of 20 μm and the taper waist region cladding diameter was about 320 μm.
4) The end face of an input optical fiber 2 is cut flat, the output optical fiber 5 after tapering is cut flat in a mode field adapter cone waist region 3, the input optical fiber 2 and the optical fiber in the mode field adapter cone waist region 3 are welded by using an optical fiber welding machine, the main discharge time is 6000ms, the discharge center deviates 3 micrometers towards one side of the optical fiber 2, and the welding loss is ensured to be less than 0.1 dB.
5) The inner cladding of the input optical fiber 2 is corroded by using glass frosting paste to prepare an input end optical fiber cladding stripping area 1, hydrofluoric acid and acidic fluoride are contained in the glass frosting paste, the concentration of the hydrofluoric acid is 15%, and the corrosion time is 30 seconds, so that fluosilicate crystals generated by chemical reaction are firmly attached to the surface of the optical fiber cladding. The cladding light stripping area 1 of the input end optical fiber is 4cm in length of the corrosion area and is 4cm away from the fusion point of the input optical fiber 2 and the optical fiber in the mode field adapter cone waist area 3; and (3) corroding the output optical fiber 5 by using glass frosting paste to prepare an output end optical fiber cladding light stripping area 6, wherein the length of the corroded area is 4cm, and the distance between the corroded area and the fusion point of the input optical fiber 2 and the optical fiber in the cone waist area 3 of the mould field adapter is 4 cm.
6) And the input end optical fiber cladding light stripping area 1, the fiber core mode field adapting area 100 and the output end optical fiber cladding light stripping area 6 are encapsulated by using a glass sleeve.
Example three:
the core and cladding diameters of the input fiber 2 were 20 μm and 400 μm, respectively, and NA0.065, and the core and cladding diameters of the output fiber 5 were 30 μm and 250 μm, respectively, and NA 0.062.
1) An input optical fiber 2 and an output optical fiber 5 were prepared, wherein the core diameter of the input optical fiber 2 was 20 μm, the cladding diameter of the input optical fiber was 400 μm, the core diameter of the output optical fiber 5 was 30 μm, and the cladding diameter of the output optical fiber was 250 μm. Stripping a section of outer cladding layer of the input optical fiber 2 close to the end face of the optical fiber, wherein the stripping length is not less than 10cm, and stripping a section of outer cladding layer of the output optical fiber 5 close to the middle position, wherein the stripping length is not less than 20 cm.
2) The working wavelength lambda of the device is determined to be 1080nm, the diameter of the fiber core of the taper waist region 3 of the mode field adapter is calculated to be about 20 mu m, and the diameter of the cladding of the taper waist region is calculated to be about 167 mu m.
3) The central section of the overclad removed output fiber 5 was heated to melt at about 1400 c and the molten output fiber 5 was then tapered using a fiber fusion tapering machine so that the core diameter of the tapered mode field adapter taper waist region 3 was 20 μm.
4) The end face of an input optical fiber 2 is cut flat, the output optical fiber 5 after tapering is cut flat in a mode field adapter cone waist region 3, the input optical fiber 2 and the optical fiber in the mode field adapter cone waist region 3 are welded by an optical fiber welding machine, the pre-melting time is 1s, the welding discharge time is 6000ms, the discharge center deviates 5 micrometers to one side of the optical fiber 2, and the welding loss is ensured to be less than 0.1 dB.
5) The inner cladding of the input optical fiber 2 is corroded by glass frosting paste, hydrofluoric acid and acidic fluoride are contained in the glass frosting paste, the concentration of the hydrofluoric acid is 15%, the corrosion time is 30 seconds, and fluosilicate crystals generated by chemical reaction are firmly attached to the surface of the cladding of the optical fiber. The cladding light stripping area 1 of the input end optical fiber is 4cm in length of the corrosion area and is 4cm away from the fusion point of the input optical fiber 2 and the optical fiber in the mode field adapter cone waist area 3; and (3) corroding the output optical fiber 5 by using glass frosting paste to prepare an output end optical fiber cladding light stripping area 6, wherein the length of the corroded area is 4cm, and the distance between the corroded area and the fusion point of the input optical fiber 2 and the optical fiber in the cone waist area 3 of the mould field adapter is 4 cm.
6) And the input end optical fiber cladding light stripping area 1, the fiber core mode field adapting area 100 and the output end optical fiber cladding light stripping area 6 are encapsulated by using a glass sleeve.
The experimental results are as follows:
it can be known from the experimental data of the comparative example and the example of the present invention that, after the technical solutions provided by the present invention are adopted, the optical loss of the fiber core is lower than that of the comparative example adopting the conventional technology, even half of the optical loss of the fiber core of the comparative example, and therefore, the technical solutions provided by the present invention can obtain good technical effects and economic values.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The optical fiber mode field adapter with the cladding power stripping function is characterized by comprising a fiber core mode field adapting area and a fiber cladding light stripping area, wherein the fiber cladding light stripping area is respectively arranged at the input end and the output end of the fiber core mode field adapting area.
2. The fiber mode field adapter with cladding power stripping function according to claim 1, wherein the fiber cladding light stripping area comprises an input end fiber cladding light stripping area and an output end fiber cladding light stripping area, and the input end fiber cladding light stripping area and the output end fiber cladding light stripping area are respectively disposed at the input end and the output end of the core mode field adapting area.
3. The fiber mode field adapter with cladding power stripping function of claim 2, wherein said input end fiber cladding light stripping region comprises an input end fiber cladding light stripping region core, an input end fiber cladding light stripping region cladding and a first cladding light stripping region; the output end optical fiber cladding light stripping area comprises an output end optical fiber cladding light stripping area fiber core, an output end optical fiber cladding light stripping area cladding and a second cladding light stripping area.
4. The fiber mode field adapter with cladding power stripping function of claim 3, wherein the fiber core mode field adapting region comprises an input fiber, a mode field adapter taper waist region, a mode field adapter transition region and an output fiber, the input fiber, the mode field adapter taper waist region, the mode field adapter transition region and the output fiber are sequentially connected end to end, the input end fiber cladding light stripping region is connected with the input fiber, and the output end fiber cladding light stripping region is connected with the output fiber.
5. The fiber mode field adapter with cladding power stripping function of claim 4, wherein the input fiber comprises an input fiber core and an input fiber cladding;
the mode field adapter cone waist area comprises a cone waist area fiber core and a cone waist area cladding;
the mode field adapter transition region comprises a transition region fiber core and a transition region cladding;
the output fiber includes an output fiber core and an output fiber cladding.
6. The fiber mode field adapter with cladding power stripping function of claim 5, wherein the input end fiber cladding light stripping area is formed by machining the input fiber, and the core of the input end fiber cladding light stripping area and the core of the input fiber have the same core diameter and numerical aperture.
7. The fiber mode field adapter with cladding power stripping function according to claim 5, wherein the output fiber cladding light stripping area and the output fiber are respectively formed by processing a large-core-diameter output fiber, and the core of the output fiber cladding light stripping area and the core of the output fiber have the same core diameter and numerical aperture.
8. The fiber mode field adapter with cladding power stripping function according to claim 5, wherein the mode field adapter cone waist region and the mode field adapter transition region are respectively formed by melting and tapering a large-core-diameter output fiber, and the fiber cores of the cone waist region and the transition region are respectively the same as the numerical aperture of the fiber core of the output fiber.
9. The fiber mode field adapter with cladding power stripping function of claim 5, wherein the diameter of the core of the output fiber is larger than the diameter of the core of the input fiber.
10. A preparation method of a fiber mode field adapter with a cladding power stripping function comprises the following steps:
preparing an input optical fiber and an output optical fiber, wherein the core diameter of the output optical fiber is larger than that of the input optical fiber;
secondly, calculating the mode field diameter of the input optical fiber according to the parameter requirements of the input optical fiber and the output optical fiber, wherein the parameter requirements comprise the numerical aperture and the fiber core diameter of the input optical fiber, the numerical aperture and the fiber core diameter of the output optical fiber and the working wavelength of a device;
in the formula, NA is the numerical aperture of the optical fiber, V is the value of the optical fiber V, D represents the diameter of the fiber core, omega is the diameter of the mode field of the optical fiber, and lambda is the working wavelength of the device; calculating the diameter of the fiber core in the cone waist region of the mode field adapter under the condition that the diameter of the mode field of the optical fiber in the cone waist region of the mode field adapter is equal to the diameter of the mode field of the input optical fiber;
thirdly, calculating parameters required by tapering the output optical fiber according to the calculated diameter of the fiber core in the conical waist area, further performing fused tapering on the output optical fiber to form a conical waist area of the mode field adapter and a transition area of the mode field adapter, and enabling the mode field diameter of the optical fiber in the conical waist area of the mode field adapter to be equal to the mode field diameter of the input optical fiber;
fourthly, welding the mode field adapter taper waist region formed by tapering the input optical fiber and the output optical fiber;
fifthly, preparing an input end optical fiber cladding light stripping area and an output end optical fiber cladding light stripping area on the input optical fiber and the output optical fiber respectively;
and sixthly, packaging by using a glass sleeve: the length of the input optical fiber and the length of the output optical fiber are 1-2 cm, and the input end optical fiber cladding light stripping area, the input optical fiber, the mode field adapter taper waist area, the mode field adapter transition area, the output optical fiber and the output end optical fiber cladding light stripping area are integrated together and packaged in a glass sleeve;
or the following steps: the lengths of the input optical fiber and the output optical fiber are respectively more than 6cm,
the input end optical fiber cladding light stripping region and the output end optical fiber cladding light stripping region are respectively packaged, and the input optical fiber, the mode field adapter cone waist region, the mode field adapter transition region and the output optical fiber are packaged together;
or the following steps: the input end optical fiber cladding light stripping area, the input optical fiber, the mode field adapter taper waist area, the mode field adapter transition area and the output optical fiber are packaged together, and the output end optical fiber cladding light stripping area is packaged independently;
or the following steps: the input end optical fiber cladding light stripping area is packaged independently, and the input optical fiber, the mode field adapter cone waist area, the mode field adapter transition area, the output optical fiber and the output end optical fiber cladding light stripping area are packaged together.
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