Photonic measurement of microwave frequency based on phase modulation.
ABSTRACT A photonic approach for microwave frequency measurement is proposed. In this approach, an optical carrier is modulated by an unknown microwave signal through a phase modulator. The modulated optical signal is then split into two parts; one part passes through a spool of polarization maintaining fiber (PMF) and the other one, through a dispersion compensation fiber (DCF), to introduce different microwave power penalties. After the microwave powers of the two parts are measured by two photodetectors, a fixed frequency-to-power mapping is established by obtaining an amplitude comparison function (ACF). A proof-of-concept experiment demonstrates frequency measurement over a range of 10.5 GHz, with measurement error less than +/-0.07 GHz.
Conference Proceeding: Instantaneous photonic microwave frequency measurement with a maximized measurement range[show abstract] [hide abstract]
ABSTRACT: The use of photonic techniques to achieve frequency-to-power mapping is very attractive for instantaneous microwave frequency measurement. To have a large measurement range and a uniform measurement resolution in the range, to accurately evaluate the center frequency of a continuous-wave (CW) as well as a pulsed microwave signal, and to easily perform calibration of the measurement system, a linear amplitude comparison function (ACF), defined as the ratio of two powers of the microwave signal experiencing different power fading, is highly desirable. In this paper, we propose and demonstrate, for the first time, a novel technique to achieve a linear ACF for microwave frequency measurement with a maximized measurement range. For a measurement resolution of ≅0.4 GHz, a measurement range of 0˜25 GHz is obtained for a CW microwave signal and a measurement range of 3˜18 GHz is achieved for a pulsed microwave signal. The system is potentially integratable in a monolithically chip, which have the desirable features of small size, low cost and stable operations.Microwave Photonics, 2009. MWP '09. International Topical Meeting on; 11/2009
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ABSTRACT: Photonics-assisted instantaneous microwave frequency measurement (IFM) has been a topic of interest recently. To perform IFM, an amplitude comparison function (ACF) that relates the microwave frequency to the microwave powers by which the microwave frequency can be estimated by measuring the microwave powers should be established. In this letter, a two-tap photonic microwave filter pair with complementary frequency responses is employed for achieving IFM. Thanks to the complementary nature of the transfer functions of the filter pair, a quasi-linear monotonically decreasing ACF over a large frequency band is obtained, which ensures an improved measurement range and accuracy. An experiment is performed. A microwave frequency measurement range as large as 36 GHz with a measurement accuracy better than ±0.2 GHz is experimentally demonstrated.IEEE Photonics Technology Letters 11/2010; · 2.19 Impact Factor
Article: Instantaneous Microwave Frequency Measurement Using a Photonic Microwave Filter With an Infinite Impulse Response[show abstract] [hide abstract]
ABSTRACT: 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.IEEE Photonics Technology Letters 06/2010; · 2.19 Impact Factor