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Research On Passive Optical Network And Code Division Multiplexing Optical Access With Chaotic Spread Spectrum Sequences

Posted on:2010-05-02Degree:DoctorType:Dissertation
Country:ChinaCandidate:L W YangFull Text:PDF
GTID:1118360278965457Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Accompany with the quick development of full-services and Internet, optical access network plays an important role in next generation network and is considered to be a hotspot. All over the world focuses on the access network which can provide more subscribers, farther distance and larger bandwidth. "To replace copper wire with optical fiber" is the recent and urgent strategy for promoting performance of access network in China. Passive optical network (PON) is emerging as a promising broadband access technique that will break through the bottle of bandwidth and meet the ever-increasing bandwidth requirement. In this paper, we researched on PON system and hybrid access network for future optical access network. We proposed some innovative results as following:1. Based on the National Nature Science Fund Project "Key Technologies Research for Intelligentized Optical Access Network" (Project NO: 60672025), we proposed the scheme for dynamic bandwidth allocation and QoS performance improvement of multi-LLID EPON system in the first time.2. Extensive work has been done on developing the National Communication Standard "Test Method for Access Network Equipment-Passive Optical Network based on Ethernet (EPON)" (National Communication Standard NO: YD/T 1531-2006, published), National Communication Research Report "Performance Parameters and Test Method for FTTH" (Project No: 2006T27, finished) and National Communication Standard "Test Method for Access Network Equipment-Gigabit-Capable Passive Optical Network (GPON)" (Project No: 2007H32, submitted).3. Based on the National Nature Science Fund Project "The Theory & Key Technologies of Full Services Broadband Optical Access Network" (project No: 60132040), we realized full-services optical access network (OAN). The overall architecture of broadband OAN (WDM-PON) was developed and the testbed was described in the first time, which can deliver broadband integrated services (video, data and voice). The project was evaluated as "Excellent in China and high level all over the world".4. We proposed an OCDMA-WDM-PON scheme with huge-capacity and large-branches in order to solve the multiple access problems. The proposed architecture can avoid the limitation of available wavelength channels and available optical codes to capacity, achieve more codewords and more available subscribers. Moreover, we have also done some work on BER performance.5. We proposed the two-level spread spectrum sequences based on chaotic Logistic-map in OCDMA, which haven't been reported yet. The correlation properties of the proposed sequences were discussed, along with simulation results. The BER performance of OCDMA system using these sequences was discussed and compared with the existing ones.6. In the third year of my PhD study, I was awarded a scholarship under the Ministry of Education of China to study at the University of Electro-Communications (UEC), Japan, as a jointly cultivated PhD candidate. Based on the Research Fund Project by Ministry of Education "Research on Access Networks with Integrated Wireless and Optical Technologies", we considered the hybrid access network system integrating Radio-On-Fiber (ROF) and WDM-PON to provide wired and wireless services in one platform simultaneously.
Keywords/Search Tags:Optical Access, Passive Optical Network (PON), Optical Code Division Multiplexing Access (OCDMA), Wavelength Division Multiplex (WDM), Chaotic
PDF Full Text Request
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