矽光子引爆光通訊漲停潮：磷化銦（InP）會是 AI 的下一個「稀土」嗎？

一句話結論： AI 算力之後，下一個瓶頸是「傳輸」——矽光子技術 1–2 年內將成主流，而其雷射光源核心材料磷化銦（InP）供應高度集中、擴產緩慢，這波光通訊漲停潮背後，是一場材料層的戰略卡位戰。

十檔漲停，「磷化銦」衝上熱搜

2026 年 8 月底，台股光通訊族群上演漲停潮，「磷化銦」一詞直接登上 Google 熱搜。催化劑有二：一是矽光子（Silicon Photonics）題材全面發酵；二是化合物半導體龍頭穩懋（WIN Semiconductors）公開表態——矽光子產品 1–2 年內可望成為市場主流，且「不擔心磷化銦缺料問題」。

一句話同時安撫了兩個市場情緒：需求是真的，供應也不怕。但磷化銦到底是什麼？為何值得整個產業嚴陣以待？

磷化銦：AI 資料中心的「點光者」

磷化銦（Indium Phosphide, InP）是 III-V 族化合物半導體，最大的本領是能高效地「發出光」與「接收光」。矽晶片擅長處理邏輯運算，卻很難直接發射雷射；而 AI 資料中心裡，GPU 之間的海量資料交換正從銅線轉向光纖——每一條光鏈路，都需要一枚由 InP 製造的雷射晶片。

這正是問題所在：矽光子負責調變與傳導光，但光源本身必須靠磷化銦。業界人士一針見血：「矽光子可以調製光，但它無法自己產生光源。」隨著 800G、1.6T 光模組放量、共同封裝光學（CPO）把光引擎推進交換器內部，對 InP 雷射的需求只會呈等比級數增長。

SK 海力士攜手研究機構在《自然電子學》發表的 CPO 路線圖：光子引擎與運算晶片的整合是大勢所趨

產業鏈卡位：誰在牌桌上？

從投研機構整理的產業地圖看，矽光子供應鏈大致分為四層：

光學晶片設計：Broadcom、Coherent、Lumentum、Marvell、NVIDIA 等掌握核心元件；
矽光子代工：台積電、聯電、Intel、GlobalFoundries 提供矽基光學晶圓製造；
InP 元件製造：Coherent 與 Lumentum 兩家寡頭主導雷射生產；
上游材料：AXT、Sumitomo 等供應 InP 基板——最上游也最稀缺的一環。

穩懋的角色特別值得注意：它以砷化鎵（GaAs）射頻代工起家，全球市佔近六成，如今正把多年積累的化合物半導體量產能力延伸到光通訊領域。穩懋敢說「不擔心缺料」，底氣來自其對 III-V 族材料的深厚工程儲備——這也是市場願意買帳的原因。

漲停潮之後：三個理性檢核點

一、缺料是真議題還是題材炒作？ 先前 AXT 與 Lumentum 簽下長期供應協議、Coherent 直言「InP 產能是首要限制」，都證明瓶頸真實存在。但從擴產到量產通常需 2–3 年，短期股價反映的是預期而非獲利。 二、技術路線仍在演進。 薄膜鈮酸鋰（TFLN）、聚合物調製器等替代方案正在追趕，CPO 滲透速度也可能低於預期。今天漲停的公司，三年後未必都在牌桌上。 三、估值已搶跑。 光通訊指標股今年普遍大漲，本益比處於歷史高位。追高前不妨自問：如果 CPO 放量時程延後一年，這些公司撐得住現在的價格嗎？

常見問題 (FAQ)

Q1：磷化銦和矽有什麼不同？為何光通訊非它不可？

A：矽是間接能隙材料，無法高效發光；磷化銦是直接能隙材料，能高效產生雷射與偵測光訊號。每條光互連鏈路都需要光源，所以 InP 雷射無法被純矽方案取代。

Q2：矽光子是什麼？和現有晶片製程有何關係？

A：矽光子是在標準 CMOS 相容的矽晶圓上製作光學元件（波導、調變器、偵測器），可借用成熟半導體產線大量生產。它讓「光學」從昂貴的手工藝變成可規模化的晶片製造，是 AI 資料中心降本增效的關鍵路徑。

Q3：穩懋說不擔心缺料，可信嗎？

A：穩懋深耕化合物半導體（GaAs/InP）代工數十年，具備材料工程能力，且正積極擴充光通訊產能。但整條供應鏈的緩解仍取決於上游基板擴產，1–2 年內供需偏緊仍是大概率事件。

Q4：普通投資人如何參與這波趨勢？

A：除了直接持有相關個股，也可關注光通訊、半導體設備類 ETF。重點是區分「真有 InP/矽光子營收」的公司與純題材股，並留意估值水位與 CPO 導入進度。

Q5：如果 InP 缺料，替代方案有哪些？

A：短期內替代有限，因為光源物理特性難繞過；中長期可關注更高效的 VCSEL 方案、薄膜鈮酸鋰調製器搭配既有光源，以及各家的 6 吋 InP 晶圓轉換進度。

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