Patent ID: 8331781
Filing Date: 2012-12-11
Classification: H04Q

Abstract:
1. An optical access network comprising: a central unit; a plurality of remote units; and at least one optical switching unit that is provided between the central unit and the remote units, wherein the central unit includes a part which transmits an optical continuous signal including packets having identification information for identifying each of the remote units to the optical switching unit, the optical switching unit includes a part which receives the optical continuous signal, optically switches the packets based on the identification information, and transmits an optical burst signal including the packets to the remote units, each of the remote units includes a part which receives the optical burst signal and acquires the packets transmitted to the remote unit, the central unit transmits a DC-balanced optical continuous signal, the optical switching unit receives the DC-balanced optical continuous signal, and performs the optical switching to transmit a DC-balanced optical burst signal, and each of the remote units receives the DC-balanced optical burst signal and acquires the packets, wherein each of the remote units includes: a photoelectric conversion circuit that converts the optical burst signal into an electric signal; an AGC that receives an output signal of the photoelectric conversion circuit and generates a signal having a constant output level; a low pass filter that rejects a high-frequency component of an output signal of the AGC; and a comparator that compares the output signal of the AGC with an output signal of the low pass filter and reproduces a signal, and the remote unit acquires the packets.