【研选行业】这个组件已成光模块“隐形瓶颈”！90%垄断格局下，国产替代窗口打开催生投资机遇，头部供应商价值重估可期

Group 1 - The article highlights that a specific component has become an "invisible bottleneck" in optical modules, with a 90% monopoly structure, indicating that the window for domestic substitution has opened, creating investment opportunities and potential for revaluation of leading suppliers [1] - It discusses the ongoing "public utility transformation" of thermal power, noting that public fund holdings are at a ten-year low, and the sector exhibits significant characteristics of both offense and defense, suggesting a focus on the third round of investment opportunities in thermal power [1]