This study proposes an amplified-spontaneous-emission feedback circuit (ASEFC) technique. The proposed technique is the first to employ signal wavelengths of an erbium-doped fiber as the input light. Consequently, the signal wavelength and dynamic range characteristics of the ASEFC were experimentally clarified. The technique demonstrated successful operation in a wide wavelength range of 1530-1560 nm, and at a low input power level of approximately −5.2 dBm. We successfully measured a small loss variation of a variable optical attenuator in a 50 km remote fiber-optic sensing configuration using the proposed ASEFC technique and achieved improved optical power resolutions of less than 0.17 mdB.
We propose a high-resolution and stable optical power measurement technique employing a temperature controlled amplifiedspontaneous-emission feedback circuit (ASEFC). We evaluate the optical power resolution (OPR) and repeatability characteristics of the temperature controlled ASEFC. The results show that small time variations in the optical power of the lights emitted from two types of light sources used in the technique are accurately measured for one hour with improvement factors larger than 97 and OPRs better than 0.10 mdB when we assume a temporal power fluctuation uncertainty of an optical power meter set after the temperature controlled ASEFC equal to 10 mdB.
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