Patent ID: 8201996

Claim:
A wavelength-division multiplexing optical temperature sensor comprising: means for separating light at a first plurality of optical wavelengths, the light enters the optical temperature sensor such that light having one of said first plurality of optical wavelengths substantially remain at the optical temperature sensor and light not having said one of said first plurality of optical wavelengths exit the optical temperature sensor; means for absorbing optical energy from said light having at least one of said first plurality of optical wavelengths and substantially simultaneously emitting light having at least one of a second plurality of optical wavelengths at a fluorescence wavelength of said absorbing means; said emitted light incorporates features dependent upon the temperature of said absorbing means; and means for combining said light at said at least one of said second plurality of optical wavelengths with other light at said second plurality of optical wavelengths; wherein temperature data is accessed according to selection of wavelength in order to determine said temperature of said absorbing means.