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Instantaneous Microwave Frequency Measurement Using a Photonic Microwave Filter With an Infinite Impulse Response

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4 Author(s)
Junqiang Zhou ; Network Technol. Res. Centre, Nanyang Technol. Univ., Singapore, Singapore ; Aditya, S. ; Shum, P.P. ; Jianping Yao

A photonic technique for instantaneous microwave frequency measurement is proposed. In the proposed technique, a photonic microwave filter having a monotonic frequency response with the magnitude varying from positive infinity to negative infinity on a log scale, is constructed by cascading two photonic microwave filters with one having an infinite impulse response and the other having a finite impulse response. For a single-frequency microwave signal with a normalized magnitude, a unique relationship between the output response and the input frequency is established. Since the response extends from positive to negative infinity, for a given measurement range, a significantly increased measurement resolution is achieved. The proposed technique is verified by an experiment.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 10 )