高損耗預算和高容量使用自相位調變在被動光纖網路正交分頻多工系統

Abstract

為了因應未來對於高畫質與品質的影音服務，國際標準組織FSAN制訂了下世代被動光纖網路的標準，我們將它命名為NGPON2。NGPON2將要提供40Gbps網路傳輸量並且需要支援對每個用戶擁有1Gbps的網路傳輸量並且光纖的距離範圍要延伸從20公里至100公里。因此，光直調偵測正交多工長距離被動光網路是非常適合的方式對於NGPON2所制訂下的標準因為在此系統具有良好的頻寬使用效率，並可以充分地分配次載波頻率位置與調變格式。 然而，在光直調偵測正交多工長距離被動光網路會遭遇到一些挑戰，包跨RF Power Fading，載波交互混合干擾（SSII）和損耗補償。因此在本篇論文中，將會利用自相位調變方式去解決RF Power Fading並且使用載波交互混合干擾消除的技術去提升整個系統的傳輸量。最後，我們用實驗來驗證系統傳60km可以達到 32-dB 高損耗補償在傳輸中沒有光放大器前提之下並且利用10GHz電吸收調變器和PIN可以支援32位用戶超過1Gbps傳輸.

In order to meet the demand of broadband in the future, the FSAN (Full Service Area Networks) will set the standard for next-generation passive optical network (NGPON), which is named as the NGPON2. The NGPON2 provides 40-Gbps capacity to support 1-Gbps data rate for optical network unit (ONU), and cover the distance from 20-km to 100-km. Consequently, the Optical OFDM PON with intensity modulation and direction (IMDD) is very suitable for NGPON2 system because the method offer high spectral efficiency and flexible bandwidth allocation. However, the Optical IMDD OFDM system will face some challenges which include RF power fading, Subcarrier-to-Subcarrier-Intermixing Interference (SSII), and lower power budget. Therefore, in my work, we take the self-phase modulation into consideration to solve the RF power fading and employ the SSII compensation to create the better data rate. Finally, we experimentally demonstrate the 60-km OFDM transmission to show 32-dB loss budget without inline and pre-amplifier. Employing 10-GHz electro-absorption modulator (EAM) and positive intrinsic negative (PIN), the system is economic to support 32ONUs with >1-Gbps/ONU capacity.