Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2005-08-30
2005-08-30
Kim, Ellen E. (Department: 2874)
Optical waveguides
With optical coupler
Plural
C398S068000, C398S069000, C359S199200
Reexamination Certificate
active
06937785
ABSTRACT:
An optical communication system using a four-wavelength add/drop type wavelength division multiplexer (WDM) is provided for extending a communication coverage without adding an optical line and a repeater by installing a wavelength-pass add/drop type optical module at an optical line connected between an existing transmitting station or base station and an existing receiving station or repeater. The optical communication system includes a slave unit including, 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. Accordingly, by installing slave units at an optical line connected to an existing base station and an existing master unit, the base station can communicate with the master unit without distortion or loss of a signal and the slave units can communicate with each other.
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PCT International Preliminary Examination Report; International application No. PCT/KR01/02099; International filling date of Dec. 5, 2001; Date of Completion Feb. 13, 2003.
International Search Report; International application No. PCT/KR01/02099; International filing date of Dec. 5, 2001; Mailing date of Mar. 18, 2002.
A&P Telecom Co., Ltd.
Cantor & Colburn LLP
Kim Ellen E.
LandOfFree
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