Patent ID: 6671430
Filing Date: 2003-12-30
Classification: G02B

Abstract:
An optical device comprising:a WDM port adapted to wavelength division multiplexing (WDM); first to N-th ports to which first to N-th wavelengths are respectively allocated, where N is an integer greater than 4; and first to fourth optical filters; said first optical filter coupling said WDM port to said i-th port by said i-th wavelength, where i is an integer satisfying 3&lE;i&lE;(Nâˆ’2), and also coupling said WDM port to said second optical filter by the plural wavelengths except said i-th wavelength; said second optical filter coupling said first optical filter to said third optical filter by said first to (iâˆ’1)-th wavelengths, and also coupling said first optical filter to said fourth optical filter by said (i+1)-th to N-th wavelengths; said third optical filter coupling said second optical filter to said first to (iâˆ’1)-th ports respectively by said first to (iâˆ’1)-th wavelengths; said fourth optical filter coupling said second optical filter to said (i+1)-th to N-th ports respectively by said (i+1)-th to N-th wavelengths.