# SemiAnalysis 分析 Co-Packaged 光学趋势下光纤主动对准与被动对准的取舍

- 来源：SemiAnalysis (@SemiAnalysis_)
- 发布时间：2026-09-03 05:01
- AIHOT 分数：30
- AIHOT 链接：https://aihot.virxact.com/items/cmtklbf6e01rgro5qind68dct
- 原文链接：https://x.com/SemiAnalysis_/status/2095255700221870574

## AI 摘要

SemiAnalysis 发文分析，随着行业转向 Co-Packaged 和 Near-Packaged Optics，光纤连接被迫直接落在 PIC 上。光纤耦合需微米级精度，边缘耦合器要求纤芯与波导偏差约半微米以内，否则耦合损耗在高带宽吞吐下不可承受；主动对准采用亚微米级串行定位加胶合，难以支撑高光纤数量且不可拆卸，而被动对准依靠机械结构将光纤保持在公差内，可实现可重复甚至可重新插拔的连接。

## 正文

As the industry moves towards Co-Packaged and Near-Packaged Optics, the fiber attach is forced to land on the PIC itself. Fiber coupling is a very precise endeavor, with micron level precision requirements. An edge coupler wants the fiber core roughly within half a micron of the waveguide otherwise this leads to unwanted coupling losses which are unaffordable for high bandwidth throughput.

This precision is brought usually with active alignment where each fiber is positioned at sub-micron accuracy (usually through signal peak calculations) and then glued down. This is however a serial process and ends up being unrealistic for high fiber count attach. More importantly, such an alignment system is inherently non-detachable.

This is where passive alignment becomes a viable alternative to active alignment. In such systems, mechanical features hold the fiber within tolerance. Fiber attach thus becomes a passive, repeatable and even re-mateable operation. (1/3)🧵