本論文提出ㄧ新架構，研究以半導體光放大器為主之全光式波長轉換技術，可應用於分波多工被動光學網路以實現廣播次系統，並合乎被動光學網路之精簡設計概念，且相容於各式分波多工被動光學網路架構。以實驗比較半導體光放大器之三種波長轉換機制的工作效能，並與系統架構設計考量後，提出以濾波器偏調法改善交叉增益調變式波長轉換，此法將有效地提升轉換訊號之訊噪比、克服載子回復時間限制而加速轉換訊號頻率響應；另外，亦大幅擴展交叉增益調變式波長轉換之輸入操作功率範圍達15分貝以上。在傳輸性能方面，作者以實驗與理論模擬證明偏調法所造成之啁啾重新分佈現象能成功地將傳輸距離從原來之10公里延伸至60公里而無嚴重誤碼率劣化，而僅增加系統6.5分貝之功率償付。

We proposed a novel scheme to enhance the performance of semiconductor optical amplifier (SOA) based all-optical wavelength conversion. The scheme is economical and compact for WDM-PON systems. Comparing the performance and architectures of three conversion mechanisms based on a SOA, we proposed a filter detuning method to improve the performance of cross-gain modulation (XGM) wavelength conversion. The improvement is due to the elimination of the waveform distortion caused by a SOA. For the back-to-back optimal filter-detuned XGM wavelength conversion, we can significantly improve the quality and frequency response of the converted signal as well as broaden the dynamic range of the input power level up to 15dB. For the transmission performance, the experiment results and theoretical simulations prove that the effects of chirp re-distribution due to filter detuning really enhance the transmission, which is improved from 10 km for the typical case to 60 km for the optimal filter-detuned case. The improvement is achieved without significant degradation of the BER by merely slightly increasing the power penalty of the system.

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