Double-lens type pipe cap

Abstract

The invention relates to a double-lens type pipe cap and belongs to the field of optical fiber communication. The pipe cap comprises an inner lens, an outer lens, an inner pipe shell and an outer pipeshell, wherein the inner lens is positioned on the inner side of the pipe cap and is relatively close to a light source; the outer lens is positioned on the outer side of the pipe cap and is relatively far away from the light source; the refractive index of the inner lens is greater than that of the outer lens; the diameter of the inner lens is smaller than that of the outer lens; the inner lensand the outer lens are aligned to each other along a central line and are respectively welded with the inner pipe shell and the outer pipe shell; the inner pipe shell and the outer pipe shell can be embedded into each other. By adopting the double-lens type pipe cap, coupling of a laser chip and an optical fiber is achieved, the cost of the pipe cap is greatly reduced when being compared with thatof a non-spherical lens pipe cap, and the coupling efficiency of the pipe cap is greatly better than that of a single-sphere sole-sphere lens pipe cap and is very approximate to that of the non-spherical lens pipe cap. High coupling efficiency can be achieved with relatively low cost.

Description

technical field [0001] The invention belongs to the field of optical fiber communication and relates to a double-lens tube cap. Background technique [0002] At present, in the field of optical fiber communication, the light emitted by the light source is coupled to the optical fiber, and a tube cap with a lens is generally used. The functions of this tube cap are: (1) airtight to protect the light-emitting chip from oxidation; (2) The light emitted by the semiconductor laser chip is focused and coupled into the optical fiber. [0003] Light source introduction: In the field of optical fiber communication, semiconductor laser LD is generally used as light source. For LDs used in optical communications, the active layer is generally very thin, with a thickness of less than 1um, and the width of the light-emitting area is generally about 1um. The divergence of the beam in the vertical and horizontal directions is different, the cross-section of the far field of the beam is e...

AI Technical Summary

Problems solved by technology

[0009] Disadvantages: irregular, poor product consistency, low coupling efficiency

[0012] Disadvantages: The disadvantage of pure spherical lenses is that there is spherical aberration

[0016] Disadvantages: high mold processing precision, difficult molding technology, large investment in equipment, expensive

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