| Autor: |
Srivastava, Nimish Kumar, Srivastava, Akash, Raghuwanshi, Sanjeev Kumar |
| Předmět: |
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| Zdroj: |
Microwave Review; Dec2018, Vol. 24 Issue 2, p3-8, 6p |
| Abstrakt: |
Photonic generation of a linearly chirped microwave waveform (LC-MW) with high chirp rate and central frequency using Dual Parallel Mach-Zehnder Modulator (DPMZM) is proposed. Many schemes are active today to generate the chirp microwave signals where optical frequency to time mapping is most commonly used technique. In the proposed scheme a modulated chirp waveform is applied at the RF port of one MZM1 of the DP-MZM and another MZM2 RF port is feed by microwave carrier. A chirp microwave waveform with high central frequency and very high time bandwidth product is generated. In microwave pulse compression a linearly chirped microwave with central frequency up to tens or even hundreds and bandwidth of few GHz are often needed, in order to meet the requirement of application in Radar system to increase the Doppler range resolution. In this paper central frequency of 6 GHz, 3 dB bandwidth of 13 GHz, chirp rate of 0.09619 1018 Hz × sec and time bandwidth product of 1756 has been achieved. The main attraction of this paper lies in the technique called photonic true time delay module based on discrete fiber Bragg grating for efficiently generating and steering the microwave beam in a desired angle. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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