980 optical fiber for small-diameter coupler

Abstract

The invention relates to an optical fiber for a small-diameter coupler, which comprises a core layer, a cladding and a coating layer, and is characterized in that the core layer is a silica quartz glass layer doped with germanium Ge, the diameter D1 of the core layer is 3.5-5[mu]m, and the refractive index difference [delta]n1 between the core layer and an inner cladding is 0.014-0.017; the cladding is divided into an inner cladding and an outer cladding, the inner cladding tightly surrounds the core layer and is a silica quartz glass layer co-doped with germanium, fluorine and phosphorus, therefractive index difference [delta]2 between pure quartz of the inner cladding and pure quartz of the outer cladding is-0.0002-0, and the diameter D2 is 5-15[mu]m; the outer cladding is a pure quartzlayer, and the thickness D3 is 79-81[mu]m; and the thickness of the coating layer is 160-190[mu]m. According to the invention, the structural design that the refractive indexes of the inner claddingand the outer cladding are basically consistent is adopted, the coupling between the optical fibers is realized by coupling part of the light in one optical fiber to the other optical fiber accordingto a fused biconical taper process by using a mechanism of mutual coupling of evanescent fields between single-mode optical fibers, and a specific splitting ratio is realized, so that the loss of signal light caused by refractive index fluctuation is reduced, and the additional loss in the fusion drawing process of the optical fiber is reduced.

Description

technical field

[0001] The invention relates to a 980 optical fiber for a fine-diameter coupler, which is used for preparing a small coupler and has stable and superior performance in the high-temperature melting cone coupling process. It belongs to the field of optical fiber technology. Background technique

[0002] Recently, some experts at home and abroad put forward a new idea, which is to use the 980nm wave band as the communication window. The advantage is that 980nm is the most commonly used wave band. Network costs. Compared with the 1310nm and 1550nm windows, the loss of light in the 980nm window is increased, and the distance that the signal can be transmitted is limited, so it cannot be used for long-distance or even medium-distance transmission, but it can meet the requirements of coupler production. Optical fiber coupler is an important device to realize optical signal splitting and combining in optical network and optical sensing system. It has important app...

Examples

Embodiment 1

[0038]The core rod is manufactured by MCVD technology, and the optical fiber preform is manufactured by OVD technology to manufacture the outer cladding. In the quartz tube, a certain amount of GeCl4 is doped in the raw material SiCl4, wherein the ratio of SiCl4 and GeCl4 is 220:650 according to the fixed flow rate, so that the refractive index difference Δn1 of the core layer relative to the inner cladding layer is 0.00152, and the mole of the doped substance The percentages are Si: 86.8%; Ge: 13.2%, the core layer diameter D1 is 3.8um; the inner cladding layer is doped with a certain amount of GeCl4, POCL3, SF6 in the raw material SiCl4, 10 times of deposition, close to the core layer to the inner cladding layer Direction, SiCl4 according to Y=20X+500, GeCl4 according to Y=5X+200SF6 according to Y=10-0.3X POCL3 according to Y=6X+130. The final refractive index difference Δn2 between the inner cladding and the quartz substrate layer is 0.0001, and the molar percentages of the...

Embodiment 2

[0040] The core rod is manufactured by MCVD technology, and the optical fiber preform is manufactured by OVD technology to manufacture the outer cladding. In the quartz tube, a certain amount of GeCl4 is doped in the raw material SiCl4, wherein SiCl4 and GeCl4 are in a fixed ratio of 250:730, so that the refractive index difference between the core layer and the inner cladding layer Δn1 is 0.00143. The molar percentages of impurities are Si: 87.5%; Ge: 12.5%, and the diameter D1 of the core layer is 4.0um; the inner cladding layer is doped with a certain amount of GeCl4, POCL3, and SF6 in the raw material SiCl4, deposited 15 times, close to the core layer In the inner cladding direction, SiCl4 follows the flow rate of Y=20X+600, GeCl4 follows the flow rate of Y=5X+230, SF6 follows the flow rate of Y=8-0.3X, and POCL3 follows the flow rate of Y=6X+100. The refractive index difference Δn2 between the final inner cladding layer and the quartz substrate layer is 0.0000, and the mo...

technical field

[0001] The invention relates to a 980 optical fiber for a fine-diameter coupler, which is used for preparing a small coupler and has stable and superior performance in the high-temperature melting cone coupling process. It belongs to the field of optical fiber technology. Background technique

[0002] Recently, some experts at home and abroad put forward a new idea, which is to use the 980nm wave band as the communication window. The advantage is that 980nm is the most commonly used wave band. Network costs. Compared with the 1310nm and 1550nm windows, the loss of light in the 980nm window is increased, and the distance that the signal can be transmitted is limited, so it cannot be used for long-distance or even medium-distance transmission, but it can meet the requirements of coupler production. Optical fiber coupler is an important device to realize optical signal splitting and combining in optical network and optical sensing system. It has important app...

Examples

Embodiment 1

[0038]The core rod is manufactured by MCVD technology, and the optical fiber preform is manufactured by OVD technology to manufacture the outer cladding. In the quartz tube, a certain amount of GeCl4 is doped in the raw material SiCl4, wherein the ratio of SiCl4 and GeCl4 is 220:650 according to the fixed flow rate, so that the refractive index difference Δn1 of the core layer relative to the inner cladding layer is 0.00152, and the mole of the doped substance The percentages are Si: 86.8%; Ge: 13.2%, the core layer diameter D1 is 3.8um; the inner cladding layer is doped with a certain amount of GeCl4, POCL3, SF6 in the raw material SiCl4, 10 times of deposition, close to the core layer to the inner cladding layer Direction, SiCl4 according to Y=20X+500, GeCl4 according to Y=5X+200SF6 according to Y=10-0.3X POCL3 according to Y=6X+130. The final refractive index difference Δn2 between the inner cladding and the quartz substrate layer is 0.0001, and the molar percentages of the...

Embodiment 2

[0040] The core rod is manufactured by MCVD technology, and the optical fiber preform is manufactured by OVD technology to manufacture the outer cladding. In the quartz tube, a certain amount of GeCl4 is doped in the raw material SiCl4, wherein SiCl4 and GeCl4 are in a fixed ratio of 250:730, so that the refractive index difference between the core layer and the inner cladding layer Δn1 is 0.00143. The molar percentages of impurities are Si: 87.5%; Ge: 12.5%, and the diameter D1 of the core layer is 4.0um; the inner cladding layer is doped with a certain amount of GeCl4, POCL3, and SF6 in the raw material SiCl4, deposited 15 times, close to the core layer In the inner cladding direction, SiCl4 follows the flow rate of Y=20X+600, GeCl4 follows the flow rate of Y=5X+230, SF6 follows the flow rate of Y=8-0.3X, and POCL3 follows the flow rate of Y=6X+100. The refractive index difference Δn2 between the final inner cladding layer and the quartz substrate layer is 0.0000, and the mo...

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