Patent ID: 6456755
Filing Date: 2002-09-24
Classification: H04J

Abstract:
An optical wavelength division multiplex (WDM) system, comprising:a first optical coupler in which is inputted one optical wavelength multiplexed signal which branches into â€œnâ€  optical wavelength multiplexed signals, â€œnâ€  being an integer being two or more; at least one more optical coupler to receive at least one of said â€œanâ€  optical wavelength multiplexed signals for branching â€œaâ€  optical wavelength multiplexed signals; and â€œnâ€  optical wavelength divides configured in parallel, to which said branching â€œnâ€  optical wavelength multiplexed signals are inputted, and in which each of said â€œnâ€  optical wavelength dividers extracts a required optical wavelength signal from said branching optical wavelength multiplexed signals respectively, and which output the extracted optical wavelength signals, said first optical coupler being connected to said â€œnâ€  optical wavelength dividers configured in parallel, and each one of said branching â€œnâ€  optical wavelength multiplexed signals and each one of said â€œnâ€  optical wavelength dividers is grouped as a pair respectively, an optical wavelength multiplexed signal dividing operation being performed between one optical wavelength signal to be outputted from one optical wavelength divider and other optical wavelength signals to be outputted from the other optical wavelength dividers independent mutually.