APPARATUS FOR COMBINING AND SPLITTING WAVELENGTH BAND HAVING THREE INPUT AND OUTPUT PORTS

Abstract

The present invention relates to an apparatus for combining and splitting wavelength

bands having three input and output ports for bi-directional transmission.

An apparatus for combining and splitting wavelength bands having three input

and output ports for bi-directional transmission according to the present invention

comprises two wavelength division multiplexing (WDM) filters, each of which

splits X-band having a range of a first wavelength or less and Y-band having a range

of a second wavelength or more from a wavelength band of light being transmitted

though the three input and output ports; and one WDM filter for splitting one or

more Z-bands having a range of a third wavelength within either X-band having

the range of the first wavelength or less or Y-band having the range of the second

wavelength or more. Alternatively, an apparatus for combining and splitting

wavelength bands having three input and output ports for bi-directional transmission

according to the present invention comprises one WDM filter for splitting X-band

having a range of a first wavelength or less and Y-band having a range of a second

wavelength or more from the wavelength band of light being transmitted; and two

WDM filters, each of which splits one or more Z-bands having a range of a third wavelength

within either X-band having the range of the first wavelength or less or Y-band

having the range of the second wavelength or more.