Abstract
In this article, a photonic scheme based on dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM) to generate switchable dual-band dual-chirp microwave waveforms is proposed and experimentally demonstrated. In the scheme, the switching among two single-band dual-chirp signals and a dual-band dual-chirp signal can be readily realized by simply adjusting the bias voltages on the modulator. Theoretical analysis on the operation of the approach is presented. Full experimental verification on the generation of switchable dual-chirp signals in the S-band and C-band has been successfully demonstrated. The presented scheme features in the simple structure, easy tunability and reconfigurability, which has potential applications in multi-band radar.
Highlights
IN modern radars, chirped microwave pulses have been widely used to improve the detection resolution since they can be compressed at a receiver [1]
In [17], a photonic method based on an integrated dual-polarization quadrature phase shift keying modulator (DP-QPSK) was demonstrated, in which a dual-band dual chirp signal with a multiplied frequency and bandwidth can be generated by adjusting the bias voltages on the modulator and controlling the polarization state of the output light
We propose and experimentally demonstrate a photonic scheme to generate switchable dual-band dual-chirp microwave waveforms based on a dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM)
Summary
IN modern radars, chirped microwave pulses have been widely used to improve the detection resolution since they can be compressed at a receiver [1]. In [13], an approach based on a dual-polarization dual-parallel Mach– Zehnder modulator for generating switchable down-, up-, and dual-chirp microwave signals was proposed and experimentally demonstrated. In [17], a photonic method based on an integrated dual-polarization quadrature phase shift keying modulator (DP-QPSK) was demonstrated, in which a dual-band dual chirp signal with a multiplied frequency and bandwidth can be generated by adjusting the bias voltages on the modulator and controlling the polarization state of the output light. The major drawback of the approach lies in the involvement of polarization state control, which makes the approach impractical in real applications It was shown in [18, 19] that dual-band dual-chirp waveforms can be generated by utilizing an optical frequency comb (OFC). We propose and experimentally demonstrate a photonic scheme to generate switchable dual-band dual-chirp microwave waveforms based on a dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM). The proposed photonic generator features in simple structure and easy tunability
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