Lens coupling apparatus, structure and method based on flat window type TO package

Abstract

The invention relates to the technical field of optical devices, and provides a lens coupling apparatus, structure and method based on a flat window type TO package. The lens coupling apparatus comprises a lens coupling tail fiber, a coupling sleeve and a magnet ring, the lens coupling tail fiber is formed by a metal outer sleeve and a ceramic ferrule, the ceramic ferrule is arranged at the internal part of the metal outer sleeve in a pressed manner, another port of the tail fiber on the ceramic ferrule is used for connecting test equipment, the coupling sleeve sleeves a step of the metal outer sleeve, the coupling sleeve and the metal outer sleeve are in clearance fit and fixed through laser beam welding, and the lower surface of the magnet ring is used for designing a magnetic force mutual coupling structure with the upper surface of peripheral metal of a lens element. According to the apparatus, structure and method, position adjustment of the lens element on the flat window type TO is driven through the magnetic adsorption type coupling mode between the magnet ring and the peripheral metal of the lens element, and after a preset lens coupling optical path aligning index requirement is met, the welding operation between coupling interfaces is completed.

Description

【Technical field】 [0001] The invention relates to the technical field of optical devices, in particular to a lens coupling device, a coupling structure and a coupling method based on a flat-window TO package. 【Background technique】 [0002] For optical devices in the field of optical communications, TO packaging has the advantages of simple process, low cost, and convenient use. At the current 10G or even 25G rate, TO packaging has been widely used. The role of the lens in the TO device is to ensure the coupling efficiency between the optical chip and the optical fiber. At present, the common TO is divided into lens type TO and flat window type TO. [0003] Lensed TO is an aspherical lens or ball lens integrated on the TO cap, this type of TO can be directly used for coupling with optical fiber. This type of TO with a lens has two disadvantages. One: because the position of the lens on the TO cap has been fixed, considering the dimensional tolerance of the internal compone...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the existing flat-window TO package, due to the dimensional tolerances of TO internal components, external components and component assembly tolerances, the focal length of each device is different, and the output optical power of the laser is different. For applications with higher requirements, the position of the lens in the device cannot be dynamically adjusted in the prior art, and it cannot be guaranteed that each device can achieve a high coupling efficiency, and the coupling consistency of the device is not good

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