以增益開關法布里-珀羅雷射二極體為基礎的全光通訊信號格式轉換元件研究

Abstract

本論文的主旨在利用半導體雷射中光注入鎖定會造成雷射的閾值電流降低現象來實現一全光式非歸零轉歸零之格式轉換器。閾值電流在注入鎖定半導體雷射情況下所造成的閾值電流降低現象也做了詳細的理論推導。在實驗上，我們成功地展示全光非歸零轉歸零的格式轉換器，同時這種利用光注入鎖定的技術可以使法布里-珀羅雷射二極體同時具備單縱模輸出、啁啾降低與頻寬延展等好處。在應用上，以此種全光格式轉換器實現之全光或閘也首度被展示。進一步，我們評估輸出歸零光訊號的啁啾特性，並以日本NTT研究群所提出的動態光固子傳輸架構為基礎提出傳輸此格式轉換後的歸零訊號之傳輸架構。

In this dissertation, a reduction in the threshold current of a Fabry-Perot laser diode (FPLD) is first used to convert a nonreturn-to-zero (NRZ) to return-to-zero (RZ) formatted data stream. The threshold current reduction in external injection locking condition is derived by using a phenomenological approach to diode lasers and Li’s theory. Such a reduction in the threshold current by the injection locking technique can reduce the linewidth/chirping and enhance the modulation bandwidth of the FPLD. In applications, an NRZ-to-RZ-based all-optical OR logic gate is also demonstrated. Furthermore, by using a spectral windowing, linear dispersion compensation, and a preemphasis technique we believe that a soliton transmission for the RZ-formatted data stream may be expected.