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Date of Publication:2014-01-01

Journal:大连理工大学学报

Issue:1

Page Number:1-5

ISSN No.:1000-8608

Abstract:A real-time frequency measurement method based on photonic technique is investigated .In this scheme , two cascaded intensity modulators are utilized to make up the structure of photonic mixing .By theoretical analysis and simulation , the time delay between optical path and radio-frequency (RF ) path is designed in order to optimize the measurement range and ensure the measurement accuracy as well .After the microwave signal mixed in the measurement system ,there is a relationship between direct current (DC) optical power and microwave frequency ,so the real-time frequency measurement by using optical power meter to monitor the DC optical power can be realized . The scheme has not employed photodetector ,and thus the system cost is reduced .The experimental results demonstrate that the measurement error is less than ± 0 .12 GHz in the frequency range of 1 to 6 G Hz .

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