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RISS 인기검색어
- 검색키워드
- 저자 : Toliver, Paul (검색결과 3 건)
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Scaling issues in photonic packet switching networks based on optical TDM
Toliver, Paul Princeton University 2000 해외박사(DDOD)
One of the fundamental pillars in the development of the next generation of broadband optical networks is scalability. This thesis explores a variety of scaling issues in photonic packet-switched networks based on optical time-division multiplexing (TDM) technology. One of the factors limiting the scalability of fiber optic networks is optical amplification. Although the erbium-doped fiber amplifier (EDFA) has been very successful for systems operating at 1.55 μm, a 1.3 μm amplifier is needed to support the large base of embedded fiber optimized for this wavelength as well as newer cable TV and access networks. A praseodymium-doped fluoride fiber amplifier (PDFFA) is designed and developed, and the challenges in making a practical amplifier are discussed. Optical demultiplexers allow for the detection of ultra-high bit-rate data streams. Three different optical switch geometries are analyzed in terms of their temporal switching window profile. A 1.5 ps wide switching window is experimentally demonstrated using one of the switch geometries, thus allowing for the detection of single-channel bit rates exceeding 640 Gb/s. As the bit rate increases, synchronization becomes more of an issue. The impact of timing jitter is evaluated, and techniques for performing synchronization are discussed. A new technique based on an optical switch with feedback is proposed and demonstrated using 100 Gb/s optical TDM packets. Optical packet compression and decompression techniques are explored. As the packet length is increased, the loss of various compression and decompression structures is analyzed. A novel structure is proposed that allows for the simultaneous compression and decompression of packets. Using 100 Gb/s packet bit rate, an experimental demonstration of the structure is performed. A testbed is constructed to demonstrate the functions necessary for a packet-switched network based on optical TDM. The major subsystems include packet generation and compression, all-optical header processing, and packet routing. An experimental demonstration is performed with 100 Gb/s optical TDM packets. Finally, optical TDM techniques are applied to analog signal transmission. Networks for supporting analog packet services as well as analog circuit services are proposed. Experimental demonstrations are performed to illustrate the capabilities of this approach to data communications.
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Toliver, Brenda Joyce University of Pittsburgh 2003 해외박사(DDOD)
The Israeli Ethiopian Jews want full admission into mainstream Israeli society. The purpose of this study is to gain insight into the social and religious impediments to integration of Ethiopian Jews in modern Israel. Other immigrant groups to Israel, though initially challenged by the same problems of absorption and settlement, after a short time gained full admission into all areas of Israeli society. This is not the case among many first and second generation Ethiopian Israelis. Thirty years after immigration, this group remains frustrated, alienated and marginalized citizens. This study will highlight two aspects of the Ethiopian Jewish challenge to full Israeli integration: (1) African spirituality, (2) Ethiopian spiritual leadership. Ethiopian Jews transplanted African spirituality to Israel. Anchored in this spirituality was a worldview that conflicted with the worldview of Israeli religious and civil authorities. Thus, the Ethiopian Jews' African spirituality presented obstacles to their full integration into mainstream Israel. Second, de-legitimation of the role and influence of Ethiopian Jewish leadership has had a profound effect on the spirituality of the community, and this de-legitimation presents another salient obstacle to their full integration into modern Israeli society. The Ethiopian Israelis are Jewish in religion, but spiritually and culturally, they are Africans.
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