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A photonic approach to realizing instantaneous measurement of microwave frequency using a pair of fiber Bragg grating (FBG)-based optical differentiators is proposed and experimentally demonstrated. In this approach, a first-order and a second-order FBG-based optical differentiators are used to achieve a linear power ratio function with a uniform measurement resolution and improved system dynamic...
A photonic approach to realizing instantaneous microwave frequency measurement based on frequency to optical power ratio mapping using a special fiber Bragg grating (FBG) is proposed and demonstrated. The special FBG is designed to have a spectral response with two slopes that are inversely proportional to optical frequency, which enables the realization of a linear power ratio function, leading to...
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