對於網路需求量的與日俱增刺激了光通訊的發展，然而目前骨幹網路中的交換機部分仍然仰賴電訊號的處理技術，大大影響了網路速度的發展。全光式交換的技術可以卻可以突破電訊號處理速度的瓶頸，而其核心的關鍵便是全光式的波長轉換。
我們希望可以做到所有訊號調變格式皆能經由全光式的波長轉換達成，而目前的波長轉換機制只有四波混頻(Four wave mixing)可以達到此目的，然而，四波混頻的波長轉換機制對於偏振態的影響極為明顯，而且將波長轉換至較遠的波長時會有轉換效率不好的情形，大大的增加了接收端解調的難度。因此，本篇論文主要就是解決偏振態的敏感問題與實現寬頻帶的波長轉換而進行的研究。

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