Patent ID: 6211983
Filing Date: 2001-04-03
Classification: H04B

Abstract:
An optical signal converting apparatus for converting an input optical signal having an input wavelength into an output optical signal having an output wavelength, said optical signal converting apparatus comprising:an optical oscillator for oscillating an oscillation optical signal having an oscillation wavelength;an optical coupler, supplied with the input optical signal and connected to said optical oscillator, for optically coupling the input optical signal and the oscillation optical signal to produce a coupled optical signal;an optical amplifier, connected to said optical coupler, for optically amplifying the coupled optical signal into an amplified optical signal, said optical amplifier optically amplifying an optical signal having the input wavelength in the coupled optical signal as is, said optical amplifier optically amplifying another optical signal having the oscillation wavelength in the coupled optical signal with bit logic inverted from that of the optical signal having the input wavelength;an optical filter, set with a transmission wavelength and connected to said optical amplifier, for optically filtering the amplified optical signal so as to transmit, as a transmitted optical signal, an optical signal having the transmission wavelength in the amplified optical signal;a mode setting arrangement, connected to said optical oscillator, for setting a mode of said optical oscillator to be one of an active mode for making said optical oscillator output the oscillation optical signal and an inactive mode for stopping said optical oscillator from outputting the oscillation optical signal; andan output terminal, connected to said optical filter, for producing the transmitted optical as the output optical signal.