Patent ID: 7792428
Filing Date: 2010-09-07
Classification: H04J,H04Q

Abstract:
1. An optical add/drop multiplexer for switching a optical path, and dropping or adding a channel that has a predetermined wavelength, the optical path for changing an input signal that has multiplexed wavelengths and that is input to an input port, to an output signal for each wavelength, the output signal being led to output ports for a plurality of routes in each transmission path, the optical add/drop multiplexer comprising: a first core unit that includes a second core unit that includes a first wavelength selective switch that is connected to the drop port, that demultiplexes the input signal dropped from the drop port for each wavelength, and that outputs a plurality of arbitrarily selected signals that are formed as a result of demultiplexing, a second wavelength selective switch that is connected to the add port, that multiplexes a plurality of arbitrarily selected signals having a plurality of wavelengths to form a multiplexed signal that is output to the add port; a drop unit that receives an output from the first wavelength selective switch and outputs a plurality of signals that are formed as a result of demultiplexing; and an add unit that multiplexes signal light that has a plurality of wavelengths, the signal light being added to the second wavelength selective switch.