以AWG為基礎之分波多工/分時多工被動式光學網路架構之設計

The Designs of AWG Based WDM/TDM PON Architecture

郭澤洋(Ze-Yang Kuo)

指導教授 ： 吳和庭

國立臺北科技大學/電資學院/資訊工程系研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00329

摘要

本論文主要可分為兩個部份，第一個部份的架構在光線路終端設備(Optical Line Terminal, OLT)上是以一個陣列波導光柵(Arrayed Waveguide Grating, AWG)和多個可調式雷射發射器(Tunable Laser, TL)所構成的，而在用戶端光網路單元(Optical Network Unit, ONU)上則以一個可調式雷射發射器和一個可調式接收器(Tunable Receiver)所構成的。在此架構上，可以利用頻寬路由與廣播的特性，做到在接取網路端達成群播封包下載傳送，也可以利用陣列波導光柵這個元件的特性，達到波長再利用的特性。另外，我們也提出了兩個考慮到優先權、TTL以及throughput的群播排程演算法，最後提出數種的擴充方法並且以模擬的方式分析其網路效能。
第二個部份的架構，考慮在波長有限的環境之下要如何的有效提高波長的再利用率，因此我們也提出了兩種適合在波長有限的環境之下運作的架構，此架構與第一部份的架構類似，主要不同的地方為將可調式雷射發射器換至為固定式雷射發射器(Fixed Laser, FL)，而接收器則會有可調式接收器與接收陣列(Receive Array, RA)兩種不同的架構，同樣的我們會以模擬的方式分析其網路效能。

關鍵字

被動式光學網路 ； 陣列波導光柵 ； 群播 ； 波長再利用

並列摘要

This thesis consists of two parts. In the first part, the architecture of OLT(Optical Line Terminal) is composed of a AWG(Array Waveguide Grating) and a few numbers of TLs(Tunable Laser). The architecture of each ONU(Optical Network Unit) is composed of one TL and one TR(Tunable Receiver).For such architecture, the AWG is used as a static wavelength routing device. Therefore, the wavelength reuse property can be achieved. We propose two corresponding multicast scheduling mechanisms to provide differentiated services. We aim to achieve low packet dropping rate while at same time maintaining the high throughput levels. Finally, we propose several upgraded mechanisms and analyze their performances by simulation.
In the second part, we further consider the network environment where the number of available wavelengths is limited. For such environment, we propose two modified architectures to enhance wavelength reuse ratio efficiently. For these modified architectures, the TL is replaced by FL(Fixed Laser) in the OLT, while in ONU, either the TR or RA(Receive Array) will be deployed. Similarly, corresponding multicast scheduling algorithms are developed. We also analyze and compare their performances by simulation.

並列關鍵字

Passive Optical Network ； Array Waveguide Grating ； Multicast ； Wavelength reuse

參考文獻

[1] Glen Kramer and Gerry Pesavento, “Ethernet Passive Optical Access Network (EPON): Building a Next-Generation Optical Access Network,” Communications Magazine, IEEE , Volume: 40 , Issue: 2 , Pages:66 – 73, Feb. 2002

[2] Fu-Tai An, Kyeong Soo Kim, Yu-Li Hsueh, Matthew Rogge, Wei-Tao Shaw, and Leonid Kazovsky, “Evolution, Challenges and Enabling Technologies for Future WDM-Based Optical Access Networks,” Joint Conference on Information Sciences, September 2003

[3] Kyeong Soo Kim, “On the evolution of PON-based FTTH solutions,” Information Sciences-Informatics and Computer Science: An International Journal, vol 149, January 2003.

[4] Leo Spiekman, David Piehler, “Semiconductor Optical Amplifiers for FTTx,” Transparent Optical Networks, 2007. ICTON '07. 9th International Conference on, Volume: 2, Pages: 48-50, July 2007.

[5] W.T. Tseng and S.Y. Kou, “A combinational media access protocol for multicast traffic in single-hop WDM LANs,” Proc. IEEE GLOBECOM’98, Volume:1, Pages:294 – 299, 1998.