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

摘要

The present invention relates to an apparatus for combining and splitting wavelength bands having four input and output ports for bi-directional transmission. An apparatus for combining and splitting wavelength bands having four 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 four input and output ports; and a WDM filter for splitting Zl -band 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; and a WDM filter for splitting Z2-band having a range of a fourth 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.