Patent ID: 6927913

Claim:
An optical signal processing apparatus which outputs from one of second and third ports each of multiple wavelengths λ 1 to λ N (N is an integer: 2≦N) input from a first port and outputs from the first port signal light components of respective wavelengths input to the second port or third port, comprising: first wavelength branch means for receiving signal light with the multiple wavelengths λ 1 to λ N input from the first port, branching the multi-wavelength signal light into the respective wavelengths, and outputting wavelength-branched signal light components of the respective wavelengths λ n (n is an integer: 2≦n≦N) to spatially different optical paths; nth polarization control means for receiving the signal light components with the wavelengths λ n output from said first wavelength branch means, controlling a polarized state of each of the signal light components with the wavelengths λ n on the basis of an externally input control signal, and outputting the signal light components; polarized wave separation means for receiving the signal light components with the wavelengths λ n output from said nth polarization control means and outputting the signal light components with the wavelengths λ n to one of first and second optical paths in accordance with the polarized state of each of the signal light components with the wavelengths λ n ; second wavelength branch means for receiving the signal light components with the wavelengths λ n output from said polarized wave separation means to the first optical path, multiplexing the signal light components, and outputting the multiplexed signal light from the second port; and third wavelength branch means for receiving the signal light components with the wavelengths λ n output from said polarized wave separation means to the second optical path, multiplexing the signal light components, and outputting the multiplexed signal light from the third port.