Patent ID: 7366426
Filing Date: 2008-04-29
Classification: H04B,H04J

Abstract:
1. An optical transmission device, comprising: an optical tunable filter which transmits and extracts signal light with a specific wavelength from signal light multiplexed by a wavelength-division multiplexing (WDM) method and whose wavelength transmission characteristic varies depending on a control signal; a light transmission filter to which signal light extracted by the optical tunable filter is inputted and which has a wavelength transmission characteristic curve that has its peak in a wavelength located between a first continuous set band and a second continuous set band longer in wavelength than the first set band, and that linearly drops from the peak toward a shorter wavelength side than the first set band and also toward a longer wavelength side than the second set band; a first optical strength detecting unit detecting strength of light transmitted through said light transmission filter; and a second optical strength detecting unit detecting the strength of reflected light which is extracted from said light transmission filter when signal light is inputted to said light transmission filter and which has a reflection characteristic, being the reversal of the wavelength transmission characteristic provided to light transmitted through said light transmission filter; and