Patent ID: 6937785
Filing Date: 2005-08-30
Classification: H04J

Abstract:
1. An optical communication system for providing a high quality mobile communication service over areas where propagation is not well accomplished and extending a communication coverage by connecting a base station to a master unit using a four-wavelength add/drop type wavelength division multiplexer (WDM), the optical communication system comprising a slave unit comprising: a first WDM for dividing or mixing a first wavelength and a second wavelength; a second WDM which is connected to the first WDM and divides or mixes the first wavelength and the second wavelength to allow them travel through a predetermined path; a third WDM which is connected to the first WDM and divides a third wavelength and a fourth wavelength from a communication line of the second wavelength; and a fourth WDM which is connected to the second WDM and multiplexes or demultiplexes the third wavelength and the fourth wavelength.