Article
Instantaneous Microwave Frequency Measurement Using an Optical Phase Modulator
Dept. of Inf. & Electron. Eng., Zhejiang Univ., Hangzhou
IEEE Microwave and Wireless Components Letters (Impact Factor: 2.24). 07/2009; DOI: 10.1109/LMWC.2009.2020046 Source: IEEE Xplore

Article: Photonic approach to broadband instantaneous microwave frequency measurement with improved accuracy
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ABSTRACT: A photonic approach for instantaneous microwave frequency measurement over a wide bandwidth is proposed and experimentally demonstrated based on the fading effect of the fiber. In this scheme, three lights with different wavelengths and three sections of optical fiber are used to construct the frequencydependent amplitude comparison functions (ACFs), using a phase modulation along with an intensity modulation. The unknown microwave frequency can be determined from the intersection of three ACFs. The method can not only provide extended measurable range of the microwave frequency, but also improve the accuracy by choosing an ACF with a large slope. The measurement errors as demonstrated in the experimental results are within ±90 MHz in the frequency range of 0.5–20 GHz.Optics Communications 10/2014; 328:87–90. · 1.54 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A prototype of instantaneous microwave frequency measurement with tunable range and resolution based on a single laser source is proposed and analyzed. In the proposal, one polarization modulator (PolM) followed by a section of dispersion compensating fiber (DCF), a polarization beam splitter (PBS) and two photodiodes (PDs) are used as the key component. To obtain an amplitude comparison function (ACF), the lightwave from a laser source should be first oriented at an angle of α (α≠0° or 90°) relative to one principal axis of PolM. After transmission of DCF, the PBS is connected with principal axis ±45° to that of PolM. Then, by monitoring and processing the microwave power of two optical paths via two PDs, frequency of microwave signal can be easily estimated. It is found that the measurement range can be stretched by simply adjusting α. Its performance is first analyzed by theory and then verified by simulations. Since the proposal is characteristic with its tunable measurement range and resolution, a frequency measurement range as large as 13.2 GHz with a measurement resolution of ±0.15 GHz is obtained.Optics & Laser Technology 11/2014; 63:54–61. · 1.65 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A microwave photonic frequency measurement system is demonstrated practically. The system employs the fourwave mixing effect in a highly nonlinear fiber to produce a lowfrequency output voltage, which is a function of input RF frequency. Using an algorithm that allows dynamic reconfiguration, the system is able to instantaneously monitor a broad frequency range for threat signals and to provide fast yet accurate frequency measurement. An operating frequency range of 0.04–40 GHz with at most 0.016% error is achieved.Journal of Lightwave Technology 11/2014; 32(15). · 2.86 Impact Factor
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