Patent ID: 6996302
Filing Date: 2006-02-07
Classification: G02B,G02F

Abstract:
1. An optical demultiplexer for separating input wavelength-multiplexed light of first and second wavelengths, said optical demultiplexer comprising: a multi-mode propagation portion having a characteristic of allowing multi-mode propagation of light of the first and second wavelengths, and separating powers of the light of first and second wavelengths by causing internal mode interference; an input portion for inputting light to said multi-mode propagation portion from such an input position as to cause separation of the powers of light in said multi-mode propagation portion; and first and second output portions for outputting the light of first and second wavelengths from said multi-mode propagation portion via such positions on an output end face as to cause separation of the powers of the light of first and second wavelengths and to maximize an extinction ratio indicating the size of the power of light of a desired wavelength with respect to the power of light of a wavelength to be cut off.