Abstract

Time division multiplexing-passive optical networks (TDM-PONs) suffer from low upstream bandwidth utilization caused by guard band and various overheads. This degradation depends on optical network unit (ONU) numbers and cycle time, each of which has many effects on cost and quality, respectively. Upstream bandwidth utilization is efficiently increased by using two wavelength types at ONU sites so that overhead parts from two ONUs are overlapped in time. Each ONU is equipped with one of the two transmitting wavelengths, and an optical line terminal (OLT) schedules operation sequence. A utilization increase of up to 30% is achieved for gigabit Ethernet-passive optical network (GE-PON) by using the proposed scheme. Two operation algorithms, based on fairness and priority, are suggested and their performances are analyzed.

© 2007 Optical Society of America

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