As the only method for all-weather, all-time and long-distance target detection recognition, radar has been intensively studied since it was invented, is considered as an essential sensor future intelligent society. In past few decades, great efforts were devoted to improving radar's functionality, precision, response time, of which key generate, control process a wideband signal with high speed. Thanks broad bandwidth, flat response, low loss transmission, multidimensional multiplexing,...

A novel microwave photonic phase shifter based on a single-sideband (SSB) polarization modulator (PolM) and polarizer is proposed demonstrated. In the SSB-PolM, two SSB intensity-modulated signals with difference of π along orthogonal directions are generated. With to combine signals, optical signal can be tuned from -180 180 deg by simply adjusting direction polarizer, whereas amplitude keeps unchanged. An experiment carried out. full-range tunable shift in frequency range 11-43 GHz...

A scheme for the generation of phase-coded microwave signals using an electrically tunable photonic phase shifter is proposed and demonstrated. The based on a single-sideband polarization modulator (PolM), tuning implemented by second PolM. By introducing RF signal to first PolM electrical coding PolM, with binary codes or polyphase achieved. An experiment performed. simple flexible operation, high rate, large frequency range, excellent transmission performance, stability system confirmed.

Phased array radars have remarkable advantages over with single-element antenna in terms of agility, flexibility, robustness, and reconfigurability. Current pure-electronic phased face challenges when operating a large frequency tunable range and/or broad instantaneous bandwidth. Microwave photonics, which allows wide bandwidth, flat response, low transmission loss, immunity to electromagnetic interference, is promising solution cope issues faced by pure electronics. In this paper, we...

Polarization modulation of two phase-correlated, orthogonally polarized wavelengths by a parabolic waveform is promising way to generate linear-frequency-modulated (LFM) signals, but the time-bandwidth product (TBWP) generated LFM signal intrinsically limited achievable index polarization modulator (PolM). In this paper, an approach increase TBWP proposed and comprehensively studied splitting electrical waveforms into N pieces with identical amplitude. Applying split PolM, total equivalent...

A programmable metasurface based on liquid crystal is of great significance to versatile dynamic wave manipulation such as beamforming and beam steering. One the biggest obstacles currently lack a simple way multi-bit programming scheme for massive electrically addressable arrays, which limits its application magnifies drawbacks like unavoidable symmetrical diffraction. Here, we put forward concept resonance switching mechanism quasi-2-bit coding control, established upon interdigital...

A novel approach to realize optical single sideband (OSSB) modulation with tunable carrier-to-sideband ratio (OCSR) is proposed and demonstrated based on cascaded polarization modulators (PolMs). In the scheme, OSSB first obtained by driving two PolMs RF signals that are 90 ° out of phase. Then, placing a polarizer after PolMs, an OSSB-modulated signal OCSR adjusting direction polarizer. An experiment carried out. from -26 46 dB achieved. The operation bandwidth covers frequency range 5-35 GHz.

Microwave photonic radars enable fast or even real-time high-resolution imaging thanks to its broad bandwidth. Nevertheless, the frequency range of usually overlaps with other existed radio-frequency (RF) applications, and only a centimeter-level resolution has been reported, making them insufficient for civilian applications. Here, we propose microwave radar sub-centimeter-level by introducing frequency-stepped chirp signal based on an optical shifting loop. As compared conventional...

A novel method to generate frequency-multiplied and phase-coded microwave signals based on a polarization division multiplexing (PDM) dual-arm Mach-Zehnder modulator (DMZM) or PDM dual-parallel MZM (DPMZM) is proposed. In the proposed scheme, PDM-DMZM PDM-DPMZM employed produce two orthogonally polarized wavelengths with wavelength spacing that two, four, eight times of driving frequency. Then signal sent into modulator-based photonic phase coder for coding. theoretical analysis an...

A polarization-based photonic microwave phase shifter that implemented with an orthogonal circularly-/linearly-polarized wavelength generator incorporated a polarizer provides advantages of high scalability, high-speed tuning, large operation bandwidth, full-360-degree tunability, flat power response, and compact configuration, making it key enabler for tunable filtering, optically controlled beamforming, speed coding, time-bandwidth product signal generation, noise measurement, co-site RF...

A novel optically controlled phased array antenna consisting a simple optical beamforming network and an N element linear patch is proposed demonstrated. The realized by independent phase shifters using shared single sideband (OSSB) polarization modulator together with controllers (PCs), beam splitters (PBSs) photodetectors (PDs). An experiment carried out. 4-element operating at 14 GHz 1 × 4 (OBFN) employed to realize the antenna. radiation patterns of -30°, 0° 30° are achieved.

An approach to implementing optical single sideband (OSSB) polarization modulation, which is a combination of two orthogonally polarized OSSB modulations with complementary phase differences between the carrier and sideband, demonstrated based on cascaded modulators (PolMs). The PolMs are driven by RF signals that 90° out phase. By properly adjusting state PolMs, modulation large operation bandwidth can be realized. experiment performed. an from 2 35 GHz successfully demonstrated. spectral...

A continuously tunable microwave photonic filter with a complex coefficient is proposed and demonstrated. The implemented by polarization-modulator-based phase shifter, which enables shift from -180° to 180° in 10-40 GHz. An experiment carried out. By simply controlling the frequency response of tuned over full free spectral range (FSR) without changing shape FSR response. shows rich set features, including simple operation, large bandwidth, high tuning speed.

Architecture for the implementation of a tunable multitap microwave photonic filter (MPF) with all complex coefficients is proposed and demonstrated. The are realized by 360° phase shifters based on single-sideband polarization modulation. modulator, wavelength-division multiplexers, polarizer, photodetector required achieving shift shared taps. Only controller in each tap to adjust independently, making system simple compact. A proof-of-concept experiment performed. four-tap MPF full free...

A photonic approach for frequency-quadrupled phase-coded signal generation with large tunability is proposed and demonstrated. In the scheme, a dual-parallel Mach-Zehnder modulator used to generate two second-order optical sidebands, which are made orthogonally polarized in Sagnac loop incorporating fiber Bragg grating. Then, polarization employed perform phase coding high rate. distinct advantage of this capability frequency tuning range, from several megahertz more than 100 GHz....

A frequency-multiplying microwave photonic phase shifter with independent multichannel shifting capability is proposed and demonstrated using an integrated polarization division multiplexing dual-parallel Mach–Zehnder modulator (PDM-DPMZM) a polarizer. By building proper power distribution network to drive the PDM-DPMZM, two sidebands along orthogonal directions are generated spacing of or four times frequency driving signal. Leading signal polarizer photodetector, frequency-doubled...

A photonic method for multioctave and reconfigurable frequency-stepped radar waveform generation is proposed experimentally demonstrated based on an optical frequency shifting loop (OFSL). When a rectangular pulse applied to the OFSL, signal can be generated. Beating with another continuous-wave carrier, electrical obtained. By meticulously adjusting relations between time duration of delay frequency-hopping rate (or period) generated reconfigured. An experiment carried out. The signals...

A photonic-assisted multi-functional radar waveform generator for single-chirped, counter-chirped, and dual-band linear frequency-modulated (LFM) microwave waveforms generation is proposed experimentally demonstrated based on an optical frequency-stepped (FSW) generator. The FSW realized by switch frequency shifting loop (OFSL). When electrical rectangular LFM pulse applied to the signal generator, would be generated. By carefully setting time length bandwidth of pulse, we can achieve...

A frequency octupling system based on a dual-parallel Mach-Zehnder modulator (DPMZM) and wavelength-fixed optical notch filter is experimentally demonstrated. millimeter-wave signal tunable from 36.8 to 42.4 GHz generated when microwave drive 4.6 5.3 applied the DPMZM. The spectral purity of also theoretically studied. An electrical harmonic suppression ratio more than 30 dB achieved.

A polarization modulator together with a polarizer can implement phase modulation, intensity modulation tunable chirp, and frequency-doubling modulation. If an optical filter is incorporated, frequency-quadrupling frequency-sextupling modulations microwave photonic shifter also be realized. By using to replace the in optoelectronic oscillator, various new features are enabled. In this article, analytical model for modulator-based systems established. The recent development employing...

A versatile arbitrary bias control technology for Mach-Zehnder modulators (MZMs) based on a linear-frequency modulated (LFM) signal is proposed. An LFM applied to the direct current (DC) port of an MZM together with DC voltage. The output microwave measured and cross-correlated fundamental frequency-doubled components signal. Their ratio serves as feedback point. experiment carried out. Compared conventional single-frequency pilot-based technique, peak power component in electrical decreases...

A photonics-based multi-function analog signal processor based on an optical polarization division multiplexing dual-parallel Mach-Zehnder modulator is proposed and demonstrated, which can implement simultaneously photonic microwave phase shifting, upconversion/downconversion filtering with excellent tunability. An experiment carried out. Downconverted upconverted shifters phases continuously tuned from -180 to 180 deg over 0-11 11-33 GHz are implemented. Based the frequency-mixed shifter, a...

Broadband image-reject mixing using a dual-channel polarization-modulated photonic microwave phase shifter is proposed and experimentally demonstrated. The realized by an orthogonal circularly-polarized wavelength generator, optical coupler, two polarizers, photodetectors (PDs). When local oscillator (LO) signal, radio-frequency (RF) image interference are supplied to the shifter, opposite shifts would be introduced RF- image-induced intermediate frequency (IF) signals. By carefully...