Patent ID: 6832019
Filing Date: 2004-12-14
Classification: G02B

Abstract:
An optical add/drop multiplexer comprising:an optical wavelength selective device adapted to reflect optical signals having a selected wavelength and to pass optical signals having wavelengths other than said selected wavelength, the wavelength selective device having a first port and a second port; a first optical circulator having an input port and a drop port, the first optical circulator adapted to direct optical signals from said input port to said first port of said wavelength selective device and to direct optical signals from said first port of said wavelength selective device to said drop port; a second optical circulator having an output port and an add port and having a first operating mode and a second operating mode, the second optical circulator, in said first operating mode, adapted to direct optical signals from said second port of said wavelength selective device to said output port, and for directing optical signals from said add port to said second port of said wavelength selective device and in said second operating mode, adapted to direct optical signals from said add port to said output port.