OPTICAL NETWORK UNIT AND METHOD FOR OPERATING THEREOF

摘要

PURPOSE: An ONU(Optical Network Unit) and a method of operating the ONU are provided to control an upstream optical signal strength based on a loss signal of downstream data and transmit upstream data generated based on the controlled upstream optical signal strength, so that an OLT(Optical Line Termination) may receive the upstream data at a constant optical signal strength. CONSTITUTION: A received data processor(201) includes an electrical signal converter(203), a power amplifier(205), and a limiting amplifier(207). The electrical signal converter converts, to a current signal, an optical signal of downstream data received from an OLT via an optical splitter. The power amplifier pre-amplifies, to a voltage signal, the current signal output from the electrical signal converter. The limiting amplifier outputs received data by converting, to a digital voltage signal, the voltage signal output from the power amplifier. A transmission data processor(209) includes a measurement unit(211), a determination unit, an E/O(Electric-to-Optic) conversion controller(215), and an E/O converter(217). The measurement unit measures a downstream optical signal strength of downstream data received from the OLT. The determination unit determines an upstream optical signal strength based on the measured downstream optical signal strength. Specifically, the determination unit compares the measured downstream optical signal strength with a predetermined downstream reference strength to calculate a loss signal of the downstream data, and to determine the upstream optical signal strength based on a predetermined upstream reference strength and the loss signal.