A method for manufacturing a single-arm side-mounted optical fiber combiner

Abstract

The present invention belongs to the technical field of optical fiber combiner manufacturing, and discloses a manufacturing method of a single-arm side-attached optical fiber combiner, comprising the following steps: providing a pump fiber and a signal fiber, tapering the pump fiber through a taper drawing device, and making the signal fiber fit closely with the taper portion of the pump fiber; using different degrees of flames to move back and forth along the pump fiber from thin to thick in order according to the flame temperature from small to large to burn and fuse the bonding area, wherein when the first degree flame and / or the second degree flame is used for burning, the center of the flame head is concentrated on the central axis of the signal fiber, and when the third degree flame is used for burning, the center of the flame head is concentrated on the boundary line between the signal fiber and the pump fiber, and the flame temperatures of the first degree flame, the second degree flame and the third degree flame increase in sequence. The present invention is directed to an optical fiber combiner with a single pump fiber on the single arm side, and can reduce related problems such as bending, bubbles, gaps and separation that are easy to occur when making a 1+1 combiner.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber combiner manufacturing, and in particular relates to a manufacturing method of a single-arm side-mounted optical fiber combiner. Background Art

[0002] The existing side-bonded pump combiners are mainly 2+1 combiners made by hydrogen-oxygen taper machines, that is, two pump fibers are tapered and symmetrically bonded to the two sides of the signal fiber. By adjusting the hydrogen-oxygen flow ratio to generate a suitable flame to burn and melt the fiber bundle, a very excellent yield production can be achieved. Among them, the two symmetrical pump fibers not only play the role of transmitting pump power, but also play a key role in the manufacturing process of the combiner, because the flame burning the fiber bundle will cause greater stress on the fiber, and this part of the stress will cause small gaps in the tightly fitted state between the fiber bundles, and then produce bubbles and bends during burning, making the product production unqualified rate very low. However, some instruments actually only need one pump, and do not need to use two pump fibers, which involves additional processing of the other pump fiber.

[0003] There are two ways of additional processing. One is to break the other pump fiber as long as possible. However, due to the burning and melting, there will always be some fiber segments left, which may cause the fiber segment to be more susceptible to stress and heat, affecting the reliability of the device. In addition, when the combiner is used as a reverse combiner, the broken fiber will also receive a small amount of forward input laser and scatter the small amount of laser into the device, increasing the risk. The other is to connect another pump fiber section to a fiber jumper to process the small amount of light entering the pump fiber, but the pump fiber and jumper of this length need to be fixed on the whole machine and water-cooled, which expands the optical layout space of the whole machine and makes the fiber arrangement structure cumbersome.

[0004] It can be seen that for an optical fiber bundle that only needs one pump but has two pump fibers, the stress generated in the optical fiber during the firing process is large and easily leads to bubbles, bending, etc., and the failure rate increases. For an optical fiber bundle that only needs one pump fiber, there is no production method for single-arm side bonding in the existing technology. The use of a double-arm firing method will easily cause related problems such as bending, bubbles, gaps and separation. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a method for manufacturing a single-arm side-mounted fiber combiner to solve the problem that the fiber bundle of the existing single pump fiber combiner is prone to bending, bubbles, gaps and separation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for manufacturing a single-arm side-mounted optical fiber combiner comprises the following steps:

[0008] Provide pump fiber and signal fiber, taper the pump fiber through a taper device, and make the signal fiber fit tightly with the taper part of the pump fiber;

[0009] Use different degrees of flames to burn and fuse the bonding area by moving back and forth along the pump fiber from thin to thick in order according to the flame temperature from small to large, wherein when the first degree flame and / or the second degree flame is used for burning, the center of the flame head is concentrated on the central axis of the signal fiber, and when the third degree flame is used for burning, the center of the flame head is concentrated on the boundary line between the signal fiber and the pump fiber, and the flame temperatures of the first degree flame, the second degree flame and the third degree flame increase in sequence;

[0010] Insertion loss test is performed to determine whether the production is qualified.

[0011] In a possible implementation, the first flame level is a low flame, the second flame level is a medium flame, and the third flame level is a high flame.

[0012] In a possible implementation, when a small flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 35-50 SCCM, the oxygen flow rate is 10-20 SCCM, and the flame head movement rate is 35-45 mm / min;

[0013] When the medium flame is used to heat and fuse the pump fiber and the signal fiber, the gas flow rate provided is 135-145 SCCM, the oxygen flow rate is 30-40 SCCM, and the flame head movement rate is 35-45 mm / min;

[0014] When a large flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 175-185 SCCM, the oxygen flow rate is 50-60 SCCM, and the flame head movement rate is 2-10 mm / min.

[0015] In a possible implementation, when a small flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 45 SCCM, the oxygen flow rate is 15 SCCM, and the flame head moving rate is 40 mm / min;

[0016] When the medium flame is used to heat and fuse the pump fiber and the signal fiber, the gas flow rate provided is 140SCCM, the oxygen flow rate is 35SCCM, and the flame head movement rate is 40mm / min;

[0017] When a high-fire flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 181 SCCM, the oxygen flow rate is 55 SCCM, and the flame head movement rate is 5 mm / min.

[0018] In a possible implementation, the step of performing an insertion loss test to determine whether the manufacturing is qualified includes the following methods:

[0019] When the pump fiber is not bonded and burned, the insertion loss test device is used to test and record the rated power value P 0 ;

[0020] After the fiber bundle is burned, record the test power value P after burning. 1 ;

[0021] The insertion loss calculation formula of the insertion loss value K is used to determine whether the signal fiber core burning loss is qualified. The insertion loss value K is required to be less than 0.2dB, where the calculation formula of the insertion loss value is K=-10log(P 1 / P 0 ).

[0022] In a possible implementation, the insertion loss test device includes a laser light source, a cladding light filter and a power meter, the output end of the laser light source is connected to the cladding light stripper through an optical fiber, the output end of the cladding light stripper is connected to one end of the signal fiber, and the power meter is located at the other end of the signal fiber.

[0023] In a possible implementation, the steps include providing a pump fiber and a signal fiber, tapering the pump fiber through a taper device, and making the signal fiber fit closely with the taper portion of the pump fiber, including the following methods:

[0024] After the pump fiber is pulled to a predetermined size, the two ends of the pump fiber and the signal fiber are fixed on the hydrogen-oxygen taper drawing machine by a clamp, and the suspended parts of the two fibers are tightly fitted by stretching or shrinking the two ends of the pump fiber and the signal fiber.

[0025] In a possible implementation, the following steps are also included:

[0026] For the optical fiber bundle that has passed the insertion loss test, apply low-fold glue to the optical fiber cladding at both ends outside the molten zone.

[0027] In a possible implementation, the pump fiber and the signal fiber are both large-size optical fibers, the cladding size of the pump fiber is less than or equal to 440 um, and the corresponding diameter of the signal fiber is the pump fiber diameter minus 100 um.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The manufacturing method of the single-arm side-attached optical fiber combiner of the present invention is aimed at the optical fiber combiner of the single-arm side single pump fiber. The initial burning direction of the flames of different degrees is all from the thin pump fiber to the thick pump fiber. This can avoid the problem that the thin pump fiber is separated from the signal fiber due to excessive burning stress transmitted from the thick pump fiber to the thin pump fiber. The burning can also be made more stable by sequentially burning with flames from small to large degrees, so as to achieve more effective melting of the optical fiber bundle. Moreover, by adjusting the flame parameters, moving speed and direction, the related problems such as bending, bubbles, gaps and separation that are easy to occur during the production of the 1+1 combiner can be reduced, and an efficient production of a single-arm side-attached pump combiner of large-size optical fibers can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flowchart of a method for manufacturing a single-arm side-mounted optical fiber combiner;

[0031] Figure 2 A schematic diagram of a fixture bonding optical fiber in a method for manufacturing a single-arm side-bonded optical fiber combiner;

[0032] Figure 3 A schematic diagram of the distribution of thick and thin areas of the pump fiber after the taper is pulled in a method for manufacturing a single-arm side-mounted optical fiber combiner;

[0033] Figure 4 The schematic diagram of the initial burning direction of the flame head and the fiber stress transfer in a method for manufacturing a single-arm side-mounted fiber combiner, wherein Figure a is from a thin pump fiber to a thick pump fiber, and Figure b is from a thick pump fiber to a thin pump fiber;

[0034] Figure 5 It is a schematic diagram of a method for manufacturing a single-arm side-mounted optical fiber combiner, in which the central moving axis of the fire head changes from the central axis of the signal fiber to the boundary line between the signal fiber and the pump fiber during the large fire head firing;

[0035] Figure 6 This is a method for manufacturing a single-arm side-mounted optical fiber combiner, and an optical path diagram for online testing of insertion loss of the combiner, wherein Figure a is a calibration optical path, and Figure b is a test optical path;

[0036] Figure 7 A schematic diagram of gluing and fixing of a fiber bundle after the fiber bundle is fired in a method for manufacturing a single-arm side-mounted fiber combiner;

[0037] Figure 8 This is a magnified schematic diagram under a microscope showing bubbles generated in the pump fiber and the signal fiber during the firing process of the 1+1 combiner without improvement;

[0038] Fig. 9 This is a magnified schematic diagram under a microscope showing the pump fiber fitting smoothly and tightly with the signal fiber from thick to thin during the firing process of the improved 1+1 combiner. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0040] Since the 2+1 specification fiber bundle needs to burn and melt two pump fibers, the flame will be larger than that of 1+1. A larger flame will cause greater insertion loss or heat to the combiner. Therefore, if only one pump fiber is essentially needed, if the 2+1 specification fiber bundle burning method is used, there will be problems such as bending, bubbles, gaps and separation.

[0041] To solve the above technical problems, please refer to Figure 1-5 As shown, an embodiment of the present application provides a method for manufacturing a single-arm side-mounted optical fiber combiner, comprising the following steps:

[0042] Step S100: providing a pump fiber and a signal fiber, tapering the pump fiber through a tapering device, and making the signal fiber fit closely with the tapered portion of the pump fiber.

[0043] In this step, the pump fiber is tapered by a tapering device to a structure that is convenient for bonding and melting. Then the tapered pump fiber and a signal fiber are tightly fitted. The tight fitting can be achieved by pulling or shrinking both ends of the pump fiber with the assistance of manual or equipment, and the fiber can be fired in the fitted state.

[0044] Step S200: Use different degrees of flames and move back and forth along the pump fiber from thin to thick in order according to the flame temperature from small to large to burn and fuse the bonding area, wherein when the first degree flame and / or the second degree flame is used for burning, the center of the flame head is concentrated on the central axis of the signal fiber, and when the third degree flame is used for burning, the center of the flame head is concentrated on the boundary line between the signal fiber and the pump fiber, and the flame temperatures of the first degree flame, the second degree flame and the third degree flame increase in sequence.

[0045] In this step, different degrees of flame are used to perform burning in sequence in multiple times in the manner of flame temperature from small to large. At the same time, during each burning process, the bonding area is burned and fused by moving back and forth along the pump fiber from thin to thick. This burning method can, when the first degree of flame is used, when the bonding state of the pump fiber and the signal fiber is not yet stable, the flame will not produce a large air disturbance to separate the optical fiber bundle at the moment and during the contact, and a small flame is used to make the two slightly adhered; when the second degree of flame is used for burning, the second degree of flame can make the optical fibers more fused and reach a stable state, and because the first degree of flame and the second degree of flame are both on the central axis of the signal fiber, the fluctuation of the thin pump fiber can be reduced; when the third degree of flame is used for burning, the bonding area is burned at a slow rate to make the fusion degree between the optical fiber bundles deeper, so as to achieve the efficiency of the combiner. The initial burning direction of all flames of different degrees is from the thin pump fiber to the thick pump fiber. The reason is that the stress generated and the stress that the thick optical fiber can withstand during burning are greater than those of the thin optical fiber. Therefore, the first step is from the thin pump fiber to the thick pump fiber to avoid excessive burning stress transferred from the thick pump fiber to the thin pump fiber, thereby causing the thin pump fiber to separate from the signal fiber.

[0046] Step S300: Perform an insertion loss test to determine whether the manufacturing is qualified.

[0047] In this step, the insertion loss condition of the optical fiber can be obtained by performing an insertion loss test, and then whether it is qualified can be determined.

[0048] Through the above technical solution, for the fiber combiner with a single pump fiber on the single-arm side, the initial burning direction of the flames of different degrees is from the thin pump fiber to the thick pump fiber. This can avoid the problem of excessive burning stress transmitted from the thick pump fiber to the thin pump fiber, which may cause the thin pump fiber to separate from the signal fiber. By burning with flames from small to large degrees in sequence, the burning can be made more stable, thereby achieving more effective melting of the fiber bundle.

[0049] In one embodiment, in step S200, the first flame level is a low flame, the second flame level is a medium flame, and the third flame level is a high flame.

[0050] In this way, a small flame can be more conducive to the initial burning of the optical fiber, allowing it to stick slightly. When the fitting state of the pump fiber and the signal fiber is not yet stable, the small flame will not produce large air disturbances to separate the optical fiber bundle at the moment of contact and during the process; by using a medium flame as the second degree of flame, the optical fibers can be better fused and reach a stable state; by using a large flame as the third degree of flame, the degree of fusion between the optical fiber bundles can be better deepened to achieve the efficiency of the combiner.

[0051] During the firing process, the amount of hydrogen and oxygen source provided also affects the size of the flame. The amount of hydrogen and oxygen source provided and the moving speed are also extremely critical. Because the larger the flame, the greater the air disturbance, and the greater the fluctuation when the optical fiber bundle is fired. Too fast will cause the firing step to be unqualified.

[0052] Therefore, in the embodiment of the present application, when a small flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 35-50 SCCM, the oxygen flow rate is 10-20 SCCM, and the flame head movement rate is 35-45 mm / min; when a medium flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 135-145 SCCM, the oxygen flow rate is 30-40 SCCM, and the flame head movement rate is 35-45 mm / min; when a large flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 175-185 SCCM, the oxygen flow rate is 50-60 SCCM, and the flame head movement rate is 2-10 mm / min.

[0053] By using the above corresponding hydrogen and oxygen amounts and flame head movement rates at low fire, medium fire and high fire respectively, the corresponding firing effect can be further exerted and the success rate can be improved.

[0054] The thicker the pump fiber is, the harder it is to fit, and the greater the stress generated during firing, the more difficult the process is. In order to better prove the firing effect, a large-size pump fiber is taken as an example for design and verification. The pump fiber cladding size is 330um, and the signal fiber cladding size is 250um. When a small flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 45 SCCM, the oxygen flow rate is 15 SCCM, and the flame head movement rate is 40mm / min; when a medium flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 140SCCM, the oxygen flow rate is 35SCCM, and the flame head movement rate is 40mm / min; when a large flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 181SCCM, the oxygen flow rate is 55SCCM, and the flame head movement rate is 5mm / min. The above data has been put into practice and summarized by the applicant many times. By using the above parameters, the pump fiber can be smoothly and tightly fitted with the signal fiber from thick to thin during the firing process of the 1+1 combiner, and the qualified rate is greatly improved.

[0055] In the embodiments of the present application, Figure 6 As shown, step S300 may include the following method:

[0056] Step S310: Before the pump fiber is laminated and fired, the insertion loss test device is used to test and record the calibrated power value P 0 ;

[0057] Step S320: After the fiber bundle is burned, record the test power value P after the burning is completed. 1 ;

[0058] Step S330: Determine whether the signal fiber core burning loss is qualified by using the insertion loss calculation formula of the insertion loss value K. The insertion loss value K is required to be less than 0.2dB, where the calculation formula of the insertion loss value is K=-10log(P 1 / P 0 ).

[0059] Through this insertion loss test method, the online insertion loss test of the combiner can be realized throughout the entire production process to avoid unobserved fiber deformation during the firing process that may cause it to fail. The insertion loss requirement is <0.2dB, and the calculation formula can more conveniently obtain insertion loss data, which is more accurate and reliable.

[0060] Specifically, the insertion loss test device may include a laser light source, a cladding light filter and a power meter. The output end of the laser light source is connected to the cladding light stripper through an optical fiber. The output end of the cladding light stripper is connected to one end of the signal fiber. The power meter is located at the other end of the signal fiber.

[0061] During the test, the laser light source uses a milliwatt laser light source, and the power meter uses a milliwatt power meter accordingly. The output fiber of the milliwatt laser light source is connected to a cladding light stripper and then connected to the signal fiber of the combiner, so that the laser entering the signal fiber is transmitted to the fiber core, and the insertion loss effect of burning on the signal fiber core is tested. When the pump fiber is not bonded and burned, turn on the light source, align the signal fiber with the center of the power meter, and record the calibrated power value P 0 Keep the light source on, attach the pump fiber and burn it, and record the test power value P after burning is completed. 1 ; The insertion loss calculation formula is used to determine whether the signal fiber core burning loss is qualified, which is less than 0.2dB.

[0062] In the specific implementation process, combined with Figure 2 As shown, step S100 includes the following method:

[0063] Step S110: After the pump fiber is pulled to a predetermined size, the two ends of the pump fiber and the signal fiber are fixed on a hydrogen-oxygen taper drawing machine by a clamp, and the suspended parts of the pump fiber and the signal fiber are tightly fitted by stretching or shrinking the two ends.

[0064] In this step, after the pump fiber is pulled to a predetermined size, the two ends of the pump fiber and the signal fiber are fixed on the hydrogen-oxygen taper machine by a clamp of the corresponding fiber size. The two ends of the pump fiber and the signal fiber are manually manipulated under a microscope to make their suspended parts fit tightly. At this time, there is no force in the fitting area, and the fitting state is achieved by stretching or contracting the two ends. The two ends of the fiber are fixed by the fiber grooves intersecting the clamps on both sides and the magnets above the fiber grooves, so that the suspended part in the middle of the fiber is close together and fits.

[0065] In addition, please refer to Figure 7 As shown, in the embodiment of the present application, the following steps may also be included:

[0066] Step S400: applying low-fold glue to the optical fiber claddings at both ends outside the molten zone of the optical fiber bundle that has passed the insertion loss test.

[0067] In this step, after the production is completed and the insertion loss test is passed, low-fold glue is applied to the optical fiber cladding at both ends outside the molten zone of the optical fiber bundle to stabilize the bare fiber of the optical fiber bundle in the production section.

[0068] The manufacturing method of the single-arm side-mounted fiber optic combiner of the embodiment of the present application is aimed at burning large-size fiber bundles of the combiner. Both the pump fiber and the signal fiber are large-size optical fibers. The cladding size of the pump fiber is less than or equal to 440um, and the corresponding signal fiber diameter is the pump fiber diameter minus 100um.

[0069] After actual verification: pump fiber 440um and below can be effectively manufactured, and the corresponding signal fiber diameter ≥ pump fiber diameter -100um.

[0070] Combination Figure 8 and Fig. 9 As shown, through the comparison before and after the improvement, it can be seen that during the firing process of the improved 1+1 combiner, the pump fiber fits smoothly and tightly with the signal fiber from thick to thin.

[0071] In summary, the embodiments of the present application can reduce the problems such as bending, bubbles, gaps and separation that are prone to occur during the production of a 1+1 combiner simply by adjusting the flame parameters, movement rate and direction, thereby achieving efficient production of a single-arm side-fit pump combiner for large-size optical fibers.

[0072] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for manufacturing a single-arm side-mounted optical fiber combiner, characterized in that: The following steps are involved: Provide pump fiber and signal fiber, taper the pump fiber through a taper device, and make the signal fiber fit tightly with the taper part of the pump fiber; Use different degrees of flames to burn and fuse the bonding area by moving back and forth along the pump fiber from thin to thick in order according to the flame temperature from small to large. When the first degree flame and the second degree flame are used for burning, the center of the flame head is concentrated on the central axis of the signal fiber. When the third degree flame is used for burning, the center of the flame head is concentrated on the boundary line between the signal fiber and the pump fiber. The flame temperatures of the first degree flame, the second degree flame and the third degree flame increase in sequence. Insertion loss test is performed to determine whether the production is qualified.

2. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 1, characterized in that: The first flame level is a low flame, the second flame level is a medium flame, and the third flame level is a high flame.

3. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 2, characterized in that: When a small flame is used to heat and fuse the pump fiber and the signal fiber, the gas flow rate provided is 35-50 SCCM, the oxygen flow rate is 10-20 SCCM, and the flame head movement rate is 35-45 mm / min. When the medium flame is used to heat and fuse the pump fiber and the signal fiber, the gas flow rate provided is 135-145 SCCM, the oxygen flow rate is 30-40 SCCM, and the flame head movement rate is 35-45 mm / min; When a large flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 175-185 SCCM, the oxygen flow rate is 50-60 SCCM, and the flame head movement rate is 2-10 mm / min.

4. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 3, characterized in that: When a small flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate is 45 SCCM, the oxygen flow rate is 15 SCCM, and the flame head movement rate is 40 mm / min. When the medium flame is used to heat and fuse the pump fiber and the signal fiber, the gas flow rate provided is 140SCCM, the oxygen flow rate is 35SCCM, and the flame head movement rate is 40mm / min; When a high-fire flame is used to heat and fuse the pump fiber and the signal fiber, the gas source flow rate provided is 181 SCCM, the oxygen flow rate is 55 SCCM, and the flame head movement rate is 5 mm / min.

5. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 1, characterized in that: The steps include the following: When the pump fiber is not bonded and burned, the insertion loss test device is used to test and record the calibrated power value P0; After the fiber bundle is burned, record the test power value P1 after the burning is completed; The insertion loss calculation formula of the insertion loss value K is used to determine whether the signal fiber core burning loss is qualified. The insertion loss value K is required to be less than 0.2dB, and the calculation formula for the insertion loss value is K=-10log (P1 / P0).

6. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 5, characterized in that: The insertion loss test device includes a laser light source, a cladding light stripper and a power meter. The output end of the laser light source is connected to the cladding light stripper through an optical fiber. The output end of the cladding light stripper is connected to one end of a signal fiber. The power meter is located at the other end of the signal fiber.

7. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 1, characterized in that: The steps include providing a pump fiber and a signal fiber, tapering the pump fiber through a taper device, and making the signal fiber fit closely with the taper portion of the pump fiber, including the following methods: After the pump fiber is pulled to a predetermined size, the two ends of the pump fiber and the signal fiber are fixed on the hydrogen-oxygen taper drawing machine by a clamp, and the suspended parts of the two fibers are tightly fitted by stretching or shrinking the two ends of the pump fiber and the signal fiber.

8. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 1, characterized in that: The following steps are also included: For the optical fiber bundle that has passed the insertion loss test, apply low-fold glue to the optical fiber cladding at both ends outside the molten zone.

9. The method for manufacturing a single-arm side-mounted optical fiber combiner according to claim 1, characterized in that: The pump fiber and the signal fiber are both large-size optical fibers. The cladding size of the pump fiber is less than or equal to 440 um, and the corresponding diameter of the signal fiber is the pump fiber diameter minus 100 um.

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