Patent ID: 7623787

Claim:
A transmission apparatus for transmitting an optical signal through a wavelength division multiplexing by using multiple wavelength light supplied from a multiple wavelength light source, comprising: a multiple wavelength light output device to output one of multiple wavelength light generated by the multiple wavelength light source and incident multiple wavelength light from a first multiple wavelength light transmission path, to a second multiple wavelength light transmission path coupled to a first adjacent transmission apparatus; a multiple wavelength light separation device to separate the multiple wavelength light into lights of respective wavelengths; a modulation device to generate an optical signal by modulating each of the separated lights of the respective wavelengths by a transmission data string; and a wavelength multiplexing device to multiplex a plurality of optical signals to output to an optical signal transmission path coupled to one of the first adjacent transmission apparatus and a second adjacent transmission apparatus, wherein the multiple wavelength light output device to output the one of the generated multiple wavelength light and the incident multiple wavelength light to the second multiple wavelength light transmission path and the multiple wavelength light separation device.