---
type: "Topics"
locale: "en"
url: "https://longbridge.com/en/topics/42832887.md"
description: "Optical communication is indeed very solid. The 'old mantou' (slang for veteran investors) and large institutions have driven it well. Stop-loss is set; short position to be built in batches up to 10 points, with a stop-loss at 4 points to admit defeat."
datetime: "2026-07-21T14:31:25.000Z"
locales:
  - [en](https://longbridge.com/en/topics/42832887.md)
  - [zh-CN](https://longbridge.com/zh-CN/topics/42832887.md)
  - [zh-HK](https://longbridge.com/zh-HK/topics/42832887.md)
author: "[港股摸金小黑手](https://longbridge.com/en/profiles/23845097.md)"
---

# Optical communication is indeed very solid. The 'o…