Patent ID: 8050574
Filing Date: 2011-11-01
Classification: H04B

Abstract:
1. An optical receiving apparatus, which receives light demultiplexed according to wavelength in a wavelength multiplex optical transmission system, the optical receiving apparatus comprising: an optical level adjuster that adjusts a level of light inputted and outputs the level-adjusted light; and a receiver that receives the light outputted from said optical level adjuster, wherein an optical level adjusted quantity in said optical level adjuster being set so that the level of light of relatively shorter wavelength band becomes relatively lower than the level of light of relatively longer wavelength band, and wherein said optical level adjuster includes a plurality of wavelength-unit optical level adjusters that adjusts levels of a plurality of inputted lights, demultiplexed according to wavelength and different from each other, in units of demultiplexed wavelengths and outputs the inputted lights, and said receiver is configured as a plurality of wavelength-unit light receivers that receives lights outputted from said plurality of wavelength-unit optical level adjusters, respectively, an optical level adjusted quantity in each of said plurality of wavelength-unit optical level adjusters being set so that the level of light of relatively shorter wavelength band becomes relatively lower than the light of relatively longer wavelength band.