An optical transmission apparatus including an optical amplifier for providing a high-power optical amplifier on the receive side, in which a wavelength of pumping light for an optical amplifier on the transmission side is suitably shifted to be different from a wavelength of pumping light for an optical amplifier on the receive side, pumping optical power for the optical amplifier on the transmission side is not all consumed in a doped fiber in amplification process, and remnant pump light that was left surplus is added by a wavelength multiplex coupler to the pumping light for the optical amplifier on the receive side, thereby enhancing a gain and light output without an increase in output power of the pumping light used for the optical amplifier on the receive side.