Patent ID: 7653311
Filing Date: 2010-01-26
Classification: H04J

Abstract:
1. An optical wavelength add-drop multiplexer placed in each node of an optical fiber transmission line transmitting a wavelength division multiplexed optical signal, said optical wavelength add-drop multiplexer comprising: means for inserting (adding) one or more optical signals having desired wavelengths into the wavelength division multiplexed optical signal transmitted through the optical fiber transmission line, or branching (dropping) one or more optical signals having the desired wavelengths from the wavelength division multiplexed optical signal transmitted through the optical fiber transmission line to extract said wavelength division multiplexer optical signal having the desired wavelengths; optical wavelength judgment means for judging whether or not one or more optical signals which are inserted into the optical wavelength add-drop multiplexer are one or more optical signals having the desired wavelengths by measuring wavelengths of the one or more inserted optical signals at each node, the optical wavelength judgment means judging that the wavelengths of the one or more inserted optical signals are correct when respective optical switches for the inserted optical signals are in an add-state and the desired wavelengths are detected; and display means for displaying one or more results of one or more judgments made by the optical wavelength judgment means, the display means being provided on a body of the optical wavelength add-drop multiplexer.