| 摘要 |
PROBLEM TO BE SOLVED: To measure optical power, without discharging light by measuring optical power which propagates in an optical fiber, utilizing the temp. change due to the photothermal conversion action. SOLUTION: Optical fiber 3 to which a transition metal is added is connected to an optical fiber 1 to be measured through a connector 2, an optical fiber 41 having a written grating at the top end adjoins the fiber 3. A grating optical fiber has the property to reflect light of a specified wavelength, the wavelength varies depending on the temp., and hence the reflection wavelength of the fiber 41 varies due to the heat generated in the optical fiber 3. An optical source 7 is connected to a spectrum analyzer 8 through an optical coupler of the fiber 41 or an optical coupling element 6 of an optical circulator, etc., a light from the optical source 7 is made incident on the fiber 41, the optical power propagating on the fiber 1 is converted into heat through the optical fiber 3, and the reflected wavelength depending on the temp. at this time is returned again to the fiber 41 and is analyzed by the spectrum analyzer 8 to measure the optical power.
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