Gigabit等級分碼多工式乙太被動式光纖網路平台於場式可程式化閘陣列上之實作
CDMA Gigabit-Ethernet Passive Optical Network Design and Implementation in FPGA
Date Issued
2005
Date
2005
Author(s)
Liao, Yen-Chun
DOI
en-US
Abstract
In recent years the bandwidth of backbone network has experienced substantial growth, but little has changed in the access networks. To solve bandwidth bottlenecks of access network, optical fibers are necessary in the last mile. Considering that Ethernet, which is low cost and easy to installation and management, has conquered the ground in local area networks (LANs), Ethernet passive optical network (EPON) may be the best solution for the broadband access. EPON combines the low cost Ethernet equipment and low cost fiber infrastructure, which is the promising candidate of next generation of last mile.
In this thesis, we design and implement an EPON with a new upstream scheme for fiber-optic code division multiple access (CDMA) systems. In the proposed system, we adopt Synchronous Optical CDMA scheme in the upstream traffic rather than the conventional scheme of time division multiple access (TDMA). Perfect difference codes are adopted as our synchronous spreading codes. An EPON system which includes one optical line terminal (OLT) and two optical network units (ONUs) is experimentally implemented. System synchronization is realized and the synchronization error less than 125ps is achieved. The OLT/ONU circuits are implemented by a Field-Programmed-Gate-Array. We describe the design flow and operation principle of each module, and complete the whole simulation of the system. Finally, we demonstrate a 20 km EPON system with downlink 10Gbps and uplink 1.25Gcps transmission rates successfully.
Subjects
被動式乙太光纖網路
光分碼多工
完美相差碼
光線路終端
光網路單元
EPON
OCDMA
PDC
OLT
ONU
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-94-R92942032-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):451609fb126d649a5156e7ab209de9ae