CN116818283A - Device and method for judging quality of optical fiber fusion joint point based on incoherent light source - Google Patents
Device and method for judging quality of optical fiber fusion joint point based on incoherent light source Download PDFInfo
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- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 5
- 238000007526 fusion splicing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an optical fiber fusion point quality judging device and method based on an incoherent light source, wherein the device comprises the incoherent light source, an optical fiber fusion machine, a beam quality analyzer and a signal and data processing system, wherein the incoherent light source is configured to generate wide-spectrum stimulated radiation laser, the optical fiber fusion machine is configured to align and fuse two sections of target optical fibers, the beam quality analyzer is configured to convert an intensity signal of laser output by a second section of target optical fiber into an electric signal in real time, and the signal and data processing system is configured to process and analyze the light spot form at the beam waist of the output laser in real time according to the electric signal measured by the beam quality analyzer to serve as a criterion whether the two sections of target optical fibers are in an optimal alignment state. The invention judges the welding quality by means of monitoring the beam waist radius and the beam quality through signal light injection, and can accurately and efficiently judge the welding quality of the welding point in real time.
Description
Technical Field
The invention relates to the technical field of optical fiber fusion welding, in particular to an optical fiber fusion joint quality judging device and method based on an incoherent light source.
Background
With the development of fiber lasers, different demands are put forward on technical indexes of fiber lasers in the market at present. One of the directions with wide application prospect is fiber laser with high beam quality and high optical axis stability. The main factors affecting the beam quality and the optical axis stability of the fiber laser are the handling of the fiber device and the fiber fusion point.
Optical fiber fusion is a core technology of optical fiber circuit link and is divided into three modes of temporary mode, movable mode and fixed mode. The temporary fusion splice is used for testing the coupling and connection between the tail fiber, the dummy fiber and the tested optical fiber. Typically using V-groove alignment and resilient capillary attachment. Flexible links are used for coupling between the machinery, wiring (optical fibers) and optical instruments of the transmission system, typically with fiber flange connections. Fixed fusion splices are used for permanent connection between optical fibers in optical fiber lines.
The optical fiber fusion splice is realized by aligning the optical fibers by using an optical fiber fusion splicer and then fusing the optical fibers by using a high-voltage arc emitted by an electrode, so that the coupling of an optical fiber mode field is realized, and the optical fiber fusion splice with low loss, low reflection, high mechanical strength and long-term stability and reliability is obtained. The method mainly comprises the following steps: the method comprises the steps of (1) processing the end face of an optical fiber to be fused, (2) fusing by an optical fiber fusion splicer, (3) protecting an optical fiber fusion joint, and (4) testing the loss of the fusion joint.
Fusion using a fiber fusion splicer is the most critical to splice quality, and because of its high degree of automation, this link is also the least controllable link for the operator at the time of fusion. Parameters such as discharge power and discharge time in the optical fiber fusion splicer have key influences on fusion splicing quality, and ideal parameters of different fusion splicers have certain differences. Therefore, in actual operation, the optimum parameters should be found out by discharge test or the like according to the kind of the spliced optical fiber and the specification, so as to reduce the welding loss. The welding operation is divided into three links: cleaning the end face of the optical fiber, aligning the optical fiber and welding the optical fiber. This in turn has the greatest effect on the final fusion splice effect, especially with fiber alignment.
To realize stable and low-loss fusion splicing of optical fibers in the fusion splicing process, the alignment precision of fiber cores before optical fiber fusion splicing is critical and is one of the technical bottlenecks of optical fiber low-loss fusion splicing. The current optical fiber alignment method mainly comprises the following steps: 1) A fiber core image detection alignment system (PAS) or a lens imaging profile alignment system (L-PAS) that is technically improved; 2) High definition imaging alignment systems (HDCM); 3) Thermal imaging fusion control (WISP); 4) Local laser injection and detection System (LID-System). Among the above alignment methods, only the optical power detection alignment system is a high-precision optical fiber core alignment system in the true sense, and the alignment technology has not been widely used at present due to cost and technology reasons.
The alignment system of the current fusion splicer mostly adopts a fiber core image alignment system, namely a PAS system, because the technology of the system is mature compared with other alignment modes, and the system is put into practical use. Such systems employ techniques that weld by analyzing the location and morphology of the core of the weld region during the welding process. The optical fiber core alignment mode realized by the optical fiber core image alignment system is an alignment mode of rapid welding, along with the rapid development of society, the requirements of modern optical fiber welding machines on the optical fiber welding loss are more and more severe, and the loss requirements are lower and more accurate alignment mode is needed, namely an optical power detection alignment mode, which is an alignment mode for realizing the high-precision optical fiber core alignment and the real welding loss measurement in the real sense.
The optical power detection alignment is based on the optical coupling effect, overcomes the defects that the relative position relation of the optical fiber connector is only considered and the optical coupling effect is not considered in the alignment modes such as a fiber core image alignment system, and the like, is a main alignment mode of a future optical fiber fusion splicer, has wide development prospect, and is worthy of time and effort to explore and research.
Disclosure of Invention
In order to solve the problems, the invention provides an optical fiber fusion point quality judging device and method based on an incoherent light source, which are used for precisely adjusting the relative position of an optical fiber to be fused by injecting the incoherent light source into the optical fiber to be fused in the fusion process, monitoring the quality of a light beam passing through the optical fiber to be fused in real time, effectively improving the optical fiber alignment precision and optimizing the optical fiber fusion quality.
In order to achieve the above technical object, the present invention provides an optical fiber fusion point quality determining device based on incoherent light source, comprising:
a incoherent light source configured to produce a broad spectrum stimulated emission laser;
an optical fiber fusion splicer configured to align and fusion splice two lengths of target optical fiber;
a beam quality analyzer configured to convert an intensity signal of the laser light output from the second section of the target optical fiber into an electrical signal in real time;
the signal and data processing system is configured to process and analyze the electric signals measured by the beam quality analyzer in real time to obtain the spot form at the beam waist of the output laser, and the spot form is used as a criterion for judging whether the two sections of target optical fibers are in the optimal alignment state.
Further, a mode field adapter is provided between the incoherent light source and the first length of target optical fiber and configured to core match the incoherent light source and the first length of target optical fiber.
Further, a collimation and beam expansion system is arranged between the second section of target optical fiber and the beam quality analyzer and is configured to collimate, expand and attenuate laser light output by the second section of target optical fiber.
Further, the collimating and beam expanding system comprises a collimating and beam expanding lens group matched with the second section of target optical fiber.
Further, the center wavelength of the broad-spectrum stimulated radiation laser generated by the incoherent light source should be matched with the target optical fiber.
The invention also provides a method for judging the quality of the optical fiber fusion point based on the incoherent light source, which comprises the following steps:
welding the incoherent light source with the first section of target optical fiber;
cutting the two sections of target optical fibers after stripping coating layers, then placing the two sections of target optical fibers in a clamp of an optical fiber fusion splicer, determining cutting angles and sections, and performing primary alignment on the two sections of target optical fibers;
generating broad-spectrum stimulated radiation laser by an incoherent light source;
the laser output by the second section of target optical fiber is connected into a beam quality analyzer;
displaying the light spot form at the position of the laser beam waist output by the second section of target optical fiber in real time through a signal and data processing system;
the optical fiber fusion splicer is adjusted to align the two target optical fibers, the real-time monitoring signal and the output laser beam waist radius measured by the data processing system are used as criteria that the two target optical fibers are in the optimal alignment state when the spot radius is minimum in the horizontal direction and the vertical direction;
when the two sections of target optical fibers are in the optimal alignment state, the optical fiber fusion splicer is controlled to carry out discharge fusion.
Further, the incoherent light source is fusion spliced to the first length of the target fiber through a mode field adapter.
And further, the laser output by the second section of target optical fiber is connected into a beam quality analyzer through a collimation beam expanding system.
Further, the collimating and beam expanding system comprises a collimating and beam expanding lens group matched with the second section of target optical fiber.
Further, the center wavelength of the broad-spectrum stimulated radiation laser generated by the incoherent light source should be matched with the target optical fiber.
The invention has the beneficial effects that:
1. the welding quality judgment is carried out by means of monitoring the beam waist radius and the beam quality through signal light injection, so that the welding quality of the welding point can be accurately and efficiently judged in real time. Compared with a fiber core image detection alignment system (PAS) adopted by a main commercial welding machine, the welding quality of each time can be predicted in advance, rather than conventional quality judgment of melting point which can only be carried out after welding.
2. The injected light source is a wide-spectrum incoherent light source, so that interference phenomenon between fundamental modes or high-order modes, which possibly occur in the optical fiber transmission process, of the coherent light source can be effectively avoided, and the welding quality of the welding point can not be accurately reflected by the quality of the light beam passing through the melting point.
3. By the optical fiber welding point quality judging device based on the incoherent light source, the relative position of the optical fibers to be welded can be controlled with high precision before each welding, and the welding success rate is improved.
Drawings
Fig. 1 is a schematic diagram of an optical fiber fusion-splice quality judgment device according to embodiment 1 of the present invention.
Fig. 2 is a graph showing the quality of light beams measured in example 2 of the present invention.
Fig. 3 is a graph showing the quality of light beams measured in example 3 of the present invention.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Example 1
As shown in fig. 1, the embodiment provides an optical fiber fusion point quality determining device based on an incoherent light source, which includes an incoherent light source, an optical fiber fusion splicer, a beam quality analyzer, and a signal and data processing system, wherein the incoherent light source is configured to generate a broad spectrum stimulated radiation laser, the optical fiber fusion splicer is configured to align and fuse two segments of target optical fibers, the beam quality analyzer is configured to convert an intensity signal of the laser output by the second segment of target optical fibers into an electrical signal in real time, and the signal and data processing system is configured to process and analyze the electrical signal measured by the beam quality analyzer in real time to obtain a spot shape at a beam waist of the output laser as a criterion whether the two segments of target optical fibers are in an optimal alignment state. Preferably, the minimum spot radius in the horizontal direction and the vertical direction can be selected as a criterion that the two target optical fibers are in the optimal alignment state.
Preferably, the optical fiber fusion point quality determination apparatus further includes a mode field adapter disposed between the incoherent light source and the first length of target optical fiber and configured to core match the incoherent light source and the first length of target optical fiber.
Preferably, the optical fiber fusion point quality determining apparatus further includes a collimating and beam expanding system disposed between the second length of target optical fiber and the beam quality analyzer, configured to collimate, expand and attenuate laser light output from the second length of target optical fiber. More preferably, the collimating and beam expanding system includes a group of collimating and beam expanding lenses that are matched to the second length of target fiber.
Preferably, the center wavelength of the broad spectrum stimulated emission laser light generated by the incoherent light source should be matched to the target optical fiber. More preferably, the broad-spectrum stimulated radiation laser generated by the incoherent light source is continuous light, and the power range of the laser reaches the beam quality analyzer through the optical fiber system is 100 mu W-10 mW.
Correspondingly, the embodiment also provides a method for judging the quality of the optical fiber fusion point based on the incoherent light source, which comprises the following steps:
step 1: welding the incoherent light source with the first section of target optical fiber;
step 2: cutting the two sections of target optical fibers after stripping coating layers, then placing the two sections of target optical fibers in a clamp of an optical fiber fusion splicer, determining cutting angles and sections, and performing primary alignment on the two sections of target optical fibers;
step 3: generating broad-spectrum stimulated radiation laser by an incoherent light source;
step 4: the laser output by the second section of target optical fiber is connected into a beam quality analyzer;
step 5: displaying the light spot form at the position of the laser beam waist output by the second section of target optical fiber in real time through a signal and data processing system;
step 6: the optical fiber fusion splicer is adjusted to align the two target optical fibers, the real-time monitoring signal and the output laser beam waist radius measured by the data processing system are used as criteria that the two target optical fibers are in the optimal alignment state when the spot radius is minimum in the horizontal direction and the vertical direction;
step 7: when the two sections of target optical fibers are in the optimal alignment state, the optical fiber fusion splicer is controlled to carry out discharge fusion.
Example 2
This example is based on example 1:
the embodiment provides an optical fiber fusion point quality judging device based on an incoherent light source, which comprises the incoherent light source, a first section of target optical fiber, a second section of target optical fiber, an optical fiber fusion splicer, a space coupling light path for testing, a light beam quality analyzer and a signal and data processing system.
The incoherent light source is a light source based on ASE, the central wavelength is positioned at 1064nm, the spectral range is 1030-1080 nm, the continuous laser is output, the output power is 8mW, the bare fiber is output, and the output fiber is PLMA-GDF-10/130-M fiber.
The first length of the target fiber is PLMA-GDF-10/130-M fiber.
The second length of the target fiber is PLMA-GDF-10/130-M fiber.
The optical fiber fusion splicer is a polarization maintaining optical fiber fusion splicer adopting a fiber core image detection alignment system (PAS).
The spatially coupled optical path for testing includes a lens group that collimates, expands and attenuates the laser light.
Welding is carried out between the incoherent light source and the first section of target optical fiber through a self-carried program of an optical fiber welding machine.
The other end of the second length of target fiber is aligned to the beam quality analyzer by the spatially coupled optical path.
The beam quality analyzer is connected with the signal and data processing system through a high-frequency cable.
The implementation mode is mainly realized by the following steps:
step 1: welding the incoherent light source output optical fiber with the first section of target optical fiber through a self-carried program of an optical fiber welding machine;
step 2: stripping, cleaning and cutting one ends of the first section of target optical fiber and the second section of target optical fiber which are ready to be welded, and then respectively putting the ends into clamps on two sides of a welding machine to be fixed;
step 3: setting a fusion procedure of a fusion splicer to adapt to an optical fiber to be fused;
step 4: checking whether the cutting and cleaning of the end face of the optical fiber to be welded are clean or not by using the set welding procedure, and if not, repeating the step 2 until the end face angle of the optical fiber accords with the setting;
step 5: turning on an incoherent light source, adjusting a space coupling light path and a light beam quality analyzer, and displaying the light spot radius at the beam waist passing through the optical fiber to be welded in real time through a signal and data processing system;
step 6: adjusting the fusion splicer, and controlling the X axis and the Y axis of the second section of target optical fiber until the beam waist radius of the light spot passing through the optical fiber to be fused is respectively minimum in two directions;
step 7: and controlling the welding machine to perform discharge welding.
Step 8: and measuring the quality of the light beam after the optical fiber is welded.
As shown in FIG. 2, in this embodiment, the quality of the light beam passing through the melting point is finally controlled to be M2. Ltoreq.1.20 by the optical fiber fusion point quality judging means. In fig. 2, the two curves marked X, Y represent the beam waist radii of the light beam in the two directions X, Y, respectively.
Example 3
This example is based on example 1:
the embodiment provides an optical fiber fusion point quality judging device based on an incoherent light source, which comprises the incoherent light source, a first section of target optical fiber, a mode field adapter, a second section of target optical fiber, an optical fiber fusion splicer, a space coupling light path for testing, a light beam quality analyzer and a signal and data processing system.
The incoherent light source is a light source based on ASE, the central wavelength is positioned at 1064nm, the spectral range is 1030-1080 nm, the continuous laser is output, the output power is 8mW, the bare fiber is output, and the output fiber is PLMA-GDF-10/130-M fiber.
The first length of the target fiber is PLMA-GDF-20/400-M fiber.
The second length of the target fiber is PLMA-GDF-20/400-M fiber.
The optical fiber fusion splicer is a polarization maintaining optical fiber fusion splicer adopting a fiber core image detection alignment system (PAS).
The spatially coupled optical path for testing includes a lens group that collimates, expands and attenuates the laser light.
Welding is carried out among the incoherent light source, the mode field adapter and the first section of target optical fiber respectively through a self-carried program of an optical fiber welding machine.
The other end of the second length of target fiber is aligned to the beam quality analyzer by the spatially coupled optical path.
The beam quality analyzer is connected with the signal and data processing system through a high-frequency cable.
The implementation mode is mainly realized by the following steps:
step 1: welding the incoherent light source output optical fiber, the mode field adapter and the first section of target optical fiber respectively through a self-carried program of an optical fiber welding machine;
step 2: stripping, cleaning and cutting one ends of the first section of target optical fiber and the second section of target optical fiber which are ready to be welded, and then respectively putting the ends into clamps on two sides of a welding machine to be fixed;
step 3: setting a fusion procedure of a fusion splicer to adapt to an optical fiber to be fused;
step 4: checking whether the cutting and cleaning of the end face of the optical fiber to be welded are clean or not by using the set welding procedure, and if not, repeating the step 2 until the end face angle of the optical fiber accords with the setting;
step 5: turning on an incoherent light source, adjusting a space coupling light path and a light beam quality analyzer, and displaying the light spot radius at the beam waist passing through the optical fiber to be welded in real time through a signal and data processing system;
step 6: adjusting the fusion splicer, and controlling the X axis and the Y axis of the second section of target optical fiber until the beam waist radius of the light spot passing through the optical fiber to be fused is respectively minimum in two directions;
step 7: and controlling the welding machine to perform discharge welding.
Step 8: and measuring the quality of the light beam after the optical fiber is welded.
As shown in fig. 2, in this embodiment, the quality of the light beam passing through the melting point is finally controlled to M2 < 1.27 by the optical fiber fusion point quality determining means. In fig. 3, the two curves marked X, Y represent the beam waist radii of the light beam in the two directions X, Y, respectively.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (10)
1. An optical fiber fusion point quality judging device based on an incoherent light source is characterized by comprising:
a incoherent light source configured to produce a broad spectrum stimulated emission laser;
an optical fiber fusion splicer configured to align and fusion splice two lengths of target optical fiber;
a beam quality analyzer configured to convert an intensity signal of the laser light output from the second section of the target optical fiber into an electrical signal in real time;
the signal and data processing system is configured to process and analyze the electric signals measured by the beam quality analyzer in real time to obtain the spot form at the beam waist of the output laser, and the spot form is used as a criterion for judging whether the two sections of target optical fibers are in the optimal alignment state.
2. The incoherent light source-based optical fiber fusion splice quality determination device of claim 1, further comprising a mode field adapter disposed between the incoherent light source and the first length of target optical fiber and configured to core match the incoherent light source to the first length of target optical fiber.
3. The incoherent light source-based optical fiber fusion splice quality determination device of claim 1, further comprising a collimation and expansion system disposed between the second length of target fiber and the beam quality analyzer, configured to collimate, expand and attenuate laser light output from the second length of target fiber.
4. A fiber splice point quality judgment device based on a non-coherent light source according to claim 3, wherein the collimating and beam expanding system comprises a collimating and beam expanding lens group matched with the second section of target fiber.
5. The device for determining the quality of an optical fiber fusion point based on an incoherent light source according to claim 1, wherein the center wavelength of the broad-spectrum stimulated emission laser light generated by the incoherent light source is matched with the target optical fiber.
6. An optical fiber fusion point quality judging method based on an incoherent light source, which is applied to the optical fiber fusion point quality judging device as claimed in claim 1, is characterized by comprising the following steps:
welding the incoherent light source with the first section of target optical fiber;
cutting the two sections of target optical fibers after stripping coating layers, then placing the two sections of target optical fibers in a clamp of an optical fiber fusion splicer, determining cutting angles and sections, and performing primary alignment on the two sections of target optical fibers;
generating broad-spectrum stimulated radiation laser by an incoherent light source;
the laser output by the second section of target optical fiber is connected into a beam quality analyzer;
displaying the light spot form at the position of the laser beam waist output by the second section of target optical fiber in real time through a signal and data processing system;
the optical fiber fusion splicer is adjusted to align the two target optical fibers, the real-time monitoring signal and the output laser beam waist radius measured by the data processing system are used as criteria that the two target optical fibers are in the optimal alignment state when the spot radius is minimum in the horizontal direction and the vertical direction;
when the two sections of target optical fibers are in the optimal alignment state, the optical fiber fusion splicer is controlled to carry out discharge fusion.
7. The method of claim 6, wherein the incoherent light source is fused to the first length of the target fiber via a mode field adapter.
8. The method for determining the quality of an optical fiber fusion point based on an incoherent light source according to claim 6, wherein the laser output from the second section of the target optical fiber is coupled to a beam quality analyzer by a collimating and beam expanding system.
9. The method of claim 8, wherein the collimating and expanding system comprises a collimating and expanding lens group that is matched to the second target fiber.
10. The method for determining the quality of an optical fiber fusion point based on an incoherent light source according to claim 6, wherein the center wavelength of the broad-spectrum stimulated emission laser light generated by the incoherent light source is matched with the target optical fiber.
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