A Study of All-optical Routing Device for DWDM System

[[abstract]]本論文提出利用布拉格光纖光柵及四埠光旋轉器之組合架構，來研製實現全光網路全頻段波長的可重組態光塞取多工器。對於現今動態光網路來說，網路需要載入的波長數量是很龐大的，但節點需要管理的波長訊號量，相對於整個網路波長卻可能是少數的，因而本論文提出一種可以選擇要管理波長的路由裝置，所選取的波長訊號可以任意的加入或取出，而不會影響其它波長訊號，而未被選取的波長訊號，則不會受影響的直接輸出。相較於之前的文獻，其利用布拉格光纖光柵及光切換器所實現的架構，本論文可以更有效地降低插入損失，同時允許白光全頻段波長輸入。對於本論文提出之可選管理波長之白光全頻段波長組態路由裝置，將可應用於都會型的區域光纖網路中，不同匯流點間之波長交換，且無須光/電、電/光轉換過程，以配合全光式的網路系統，並且本論文實驗證明此系統可應用於高密度分波多工系統中，並且得到良好的串音(? 23.93 dB)及功率惡化(? 1.45 dB)。[[abstract]]This paper is to present a reconfigurable optical add-drop multiplexer (ROADM) by using fiber Bragg gratings (FBGs) and optical circulators (OCs). It allows the white spectral channels inputted. For the current dynamic optical network, the network accommodates many large wavelengths to carry information. However, the local node could just handle a few wavelength channels. This paper proposes a kind of ROADM to allow choosing the wavelength channels we want to handle. By installing the corresponding FBGs in the proposed ROADM, the network manager can add-drop the wavelength channels that we want manage without interfering other wavelength channels. The other wavelength channels we don’t handle would directly pass through the output port. Compare with the other ROADM papers presented before, the proposed RAODM not only effectively reduces the insertion loss but allows white spectral channels input. The experiment proved that the ROADM system could be applied dense wavelength division multiplexing (DWDM) system, and obtain a good performance of crosstalk (? 23.93 dB) and power penalty (? 1.45 dB) in this paper