我們知道分波多工(wavelength-division multiplexing)之通訊系統能對於系統中的頻寬可得到更有效的運用。然而光波長塞取多工器在這系統中是一個重要的元件，主要的功能是可以選擇我們所需要的波長，但在很多文獻中所提供的光波長塞取多工器都為固定式，然而本論文中我們將利用溫度分布來改變布拉格光纖光柵反射頻譜來達成可調式的光波長塞取多工器。除此，我們也將利用溫度分布的方法來降低波長濾波器的色散現象。
當我們想把分波多工系統的容量提升，也就是需要把波長頻寬從0.8nm到0.4nm或是更小的高密度波多工系統時，而相位型光纖光柵可以將波長的頻寬降到10pm以下，除此之外，相位型光纖光柵也已經利用於雷射等方面，所以相位型光纖光柵也變成未來很重要的元件，而我們也將提供利用兩個溫度調變後之反射頻譜強度及基因演算法來重建相位型光纖光柵的各項參數。

The use of a Wavelength-division multiplexing (WDM) based communication system allows for better utilization of the spectral bandwidth resources available to the system. The Optical Add-Drop Multiplexer (OADM) is very important component in the system and the main function is the selective wavelength. In OADMs configuration, it is usually design to add and drop fixed wavelength channels. However, we will propose a new simplified and low-cost configuration based on tunable OADM with thermal controller. In addition, the low dispersion filter is also obtained by the temperature distribution.
When the transmission capacity in the system want to be increased, the transmission bandwidth must drop for 0.8 nm to 0.4 nm or more narrow such as Dense Wavelength-division multiplexing (DWDM). Then, the passband of a phase-shift FBG can be smaller than 10 pm. The phase-shift FBG will become an important component because it has applied to the distributed feedback (DFB) fiber lasers, tunable loss filters and so on. The study has proposed a synthesis technique for the reconstruction of the multiple parameters using a genetic algorithm and two thermally modulated intensity spectra.

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