Optical multiaccess networks, and more specifically passive optical networks (PONS) are considered to be one of the most promising technologies for deploying fiber-to-the-building/home/curb (FTTx). PONs are expected to solve the problem of limited bandwidth, the so called "first and last mile problem", that remains the bottleneck between the backbone network and high-speed local area networks (LANs). PONs provide a low-cost solution and a guaranteed quality of service (QoS) to enable new multimedia services. In a PON, multiple users share the fiber infrastructure in a point-to-multipoint (P2MP) network topology. This is in contrast to current access technologies, including DSL, VDSL, and cable, which use a point-to-point (P2P) network topology. The P2MP nature of networks introduces optical path delays which inherently cause the data packets to undergo amplitude, phase, and frequency variations - burst, mode trafic. This consequently creates new challenges for the design of optical receivers. / Optical receivers, and in particular, burst-mode receiver front-ends (BM-RXs) and burst-mode clock and data recovery circuits (BM-CDRs), must adapt to burst-mode traffic, where data bursts originate from various sources and travel different distances. The amplitude and phase of successive packets may therefore vary anywhere between 0--20 dB and --pi to +pi rads. The research objective of this thesis is to design, test, and enhance performance requirements of BM-CDRs for PONs. / We design and experimentally demonstrate a 622/1244 Mb/s BM-CDR with forward error correction (FEC) using Reed-Solomon (R-S(255, 239)) codes for Gigabit PONs (GPONs). We measure a coding gain of approximately 5 dB at bit error ratio (BER) of 10-10. The coding gain obtained verifies the claim of the increased link budget specified by ITU-T G.984.3 standard. / We also develop a novel technique for fast burst-error correction for bursty channels. This is achieved by employing FEC on BM-CDRs with fast phase acquisition time. We demonstrate this with our custom built bit error rate tester/analyzer (BBERT/A). / Finally, we develop a small-signal modeling technique for characterizing photodiodes. This technique is based on the measurement of S 11 parameters. We demonstrate our idea with a 10 GHz 1310/1550 nm InGaAs/InP PIN photodiode.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.99792 |
| Date | January 2007 |
| Creators | Shastri, Bhavin Jayprakash. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Electrical and Computer Engineering.) |
| Rights | © Bhavin Jayprakash Shastri, 2007 |
| Relation | alephsysno: 002614840, proquestno: AAIMR32620, Theses scanned by UMI/ProQuest. |
Page generated in 0.0016 seconds