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Abstract

To realize an optical demultiplexer with a constant chromatic dispersion value, an optical signal of wavelength (.lambda.1) enters a port (A) of an optical circulator (10), and an optical signal of wavelength (.lambda.2) enters a port (A) of an optical circulator (12). A port (B) of the optical circulator (10) connects to a port (X0) of an interleaved optical filter (14), and a port (B) of the optical circulator (12) connects to a port (X1) of the optical filter (14). A port (Y0) of the optical filter (14) connects to a port (Y1) of the optical filter (14) through an optical isolator (16). The optical isolator (16) allows the optical propagation from the port (Y0) to the port (Y1) of the optical filter (14) and refuses the optical propagation from the port (Y1) to the port (Y0). An optical coupler (18) combines the input lights of the input ports (X0 and X1) from ports (C) of the optical circulators (10 and 12) and outputs from the output port (Y0). The optical filter (14) transmits wavelength (.lambda.1) in the straight propagation between the ports (X0, Y0) and between the ports (X1, Y1) and transmits wavelength (.lambda.2) in the cross propagation between the ports (X0, Y1) and between the ports (X1, Y0).

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