A multi-film TOSA packaging structure

By designing a multi-film TOSA packaging structure, the problem of complex reflected light when the laser TO-CAN is applied to optical devices is solved, realizing optical path transmission with low energy loss and high signal quality, suitable for SFP modules of 50G PAM4 transmission.

CN224438223UActive Publication Date: 2026-06-30WUHAN HUAGONG GENUINE OPTICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
WUHAN HUAGONG GENUINE OPTICS TECH CO LTD
Filing Date
2025-06-23
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In the existing technology, when laser TO-CAN is applied to optical devices, the reflected light in the optical path is complex, and the reflected light affects the signal quality, which cannot meet the technical specifications of the optical module.

Method used

Design a multi-film TOSA packaging structure, including TO-CAN and fiber optic adapter. The mirror cavity is equipped with a first collimating lens, a second collimating lens and a filter. The filter is used to prevent reflected light from entering the TO-CAN or fiber optic port. The small volume design is achieved through optical simulation, and the reflective surface design is combined to avoid multiple diffuse reflections.

Benefits of technology

It achieves low optical path energy loss, meets signal quality requirements, and has a hermetically sealed package, making it suitable for 50G PAM4 transmission SFP modules.

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Abstract

This invention belongs to the field of optical communication technology, specifically providing a multi-film TOSA packaging structure, including a TO-CAN and an optical fiber adapter. The optical fiber adapter is installed at the cap end of the TO-CAN and forms a mirror cavity with the TO-CAN. A first collimating lens, a second collimating lens, and a filter are disposed within the mirror cavity. The first collimating lens, the filter, the second collimating lens, and the optical fiber port of the optical fiber adapter are arranged sequentially along the emission optical path of the TO-CAN. The filter is used to prevent reflected light from entering the TO-CAN or the optical fiber port. This multi-film TOSA packaging structure provided by this invention is highly integrated. The collimating lens converts the laser light output into parallel light, resulting in a small spot size, facilitating optical path transmission, and reducing energy loss. Through the cooperation of the collimating lens and the filter, reflected light in the optical path does not affect signal quality in the TOSA coaxial package, meeting specification requirements and achieving hermetic packaging.
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