Patent ID: 7369771
Filing Date: 2008-05-06
Classification: H04B

Abstract:
1. An optical network terminator equipped with a power supply unit and adapted to be connected to a central office through an optical fiber, comprising: an optical wavelength division multiplexer for receiving a reception optical signal and incoherent light provided from the central office, and individually outputting the reception optical signal and the incoherent light; an optical detection unit for converting both a downstream high speed optical signal and a downstream low speed optical signal corresponding to the reception optical signal provided from the optical wavelength division multiplexer into electrical signals, respectively; a laser diode connected to the optical wavelength division multiplexer to convert an upstream signal into an optical signal; a high speed driving unit supplied with power from the power supply unit to drive the laser diode that is forward biased using the upstream signal and to establish a data and video channel for the purpose of transmitting data and video signal to the central office through the optical wavelength division multiplexer; a high speed reception unit supplied with power from the power supply unit to receive a downstream data and video channel from the optical detection unit; a charging unit charged with the power supplied from the power supply unit in a steady state, the charging unit outputting charged power at the time of a power failure; a low speed driving unit supplied with power from the charging unit by driving the laser diode at a low power to establish a voice channel for the purpose of transmitting voice signal to the central office through the optical wavelength division multiplexer; and a low speed reception unit supplied with the power from the charging unit to receive a voice channel from the optical detection unit.