Patent ID: 6538783
Filing Date: 2003-03-25
Classification: H04J

Abstract:
An optical system comprising:at least a first optical transmitter configured to transmit information via optical signals including at least one signal wavelength; an add/drop device configured to receive the optical signal from said first optical transmitter via an input path, said add/drop device including a first selective element configurable to pass a first signal wavelength from said input path to a first add/drop path and pass continuing signal wavelengths differing from the first signal wavelength to a second add/drop path, a second selective element configurable to pass a second signal wavelength from said first add/drop path and continuing signal wavelengths differing from the second signal wavelength from said second add/drop path to an output path and pass the second signal wavelength from said second add/drop path and signal wavelengths differing from the second signal wavelength from said first add/drop path to a drop path; at least a first optical receiver configured to receive the output signal from said add/drop device; and, at least a second optical receiver configured to receive the drop signal from said add/drop device.