A photonic approach to generate a frequency and bandwidth multiplying dual-chirp microwave waveform using single dual-polarization quadrature phase shift keying (DP-QPSK) modulator is proposed demonstrated. In the scheme, an RF carrier applied one QPSK baseband single-chirp another. By setting driving signals adjusting dc bias phases in modulator, high-order optical sidebands can be obtained with suppressed. After electrical conversion, frequency-doubling bandwidth-quadrupling, or...

A photonics-based anti-chromatic dispersion transmission scheme for multi-band linearly frequency modulated (LFM) signals is proposed and experimentally demonstrated. In the central station (CS), key component an integrated dual-polarization quadrature phase shift keying (DP-QPSK) modulator, of which up-arm down-arm are driven by a microwave reference signal intermediate-frequency (IF) LFM respectively. By properly adjusting DP-QPSK optical comb (OFC) lightwave generated. After polarization...

A photonic approach to generate dual-chirp microwave waveform with multi-carrier frequencies and multiplying bandwidth is proposed demonstrated by using a dual-polarization Mach-Zehnder modulator (DPol-MZM) balanced detection. In the approach, DPol-MZM driven baseband modulates injected optical signal broad-spectra sidebands. After heterodyne in photodetector (BPD), multi-frequency can be generated. The generator allows arbitrary intensity modulation format. key features of are generation...

Photonic generation and transmission of linearly chirped microwave waveform with the increased time-bandwidth product (TBWP) is proposed demonstrated by phase-encoding splitting parabolic waveform. In approach, dual-polarization Mach-Zehnder modulator (DPol-MZM) along polarization controller (PC) employed to generate two orthogonally polarized wavelengths, driven a signal. After convolving binary pseudo random sequence, high bandwidth large temporal duration generated, corresponding an...

A photonic approach to realizing anti-chromatic dispersion transmission for a frequency and bandwidth-doubling dual-chirp microwave waveform is proposed experimentally demonstrated. The system has no requirement on polarization devices or optical filters only the integrated dual-drive dual-parallel Mach-Zehnder modulator employed. To overcome chromatic dispersion, carrier suppression proposed. process accomplished in central station independent frequency, fiber length, coefficients. An...

A novel non-planar coding metasurface optimized by discrete particle swarm algorithm (DPSO) is proposed in terms of the property wideband radar cross-section (RCS) and diffuse scattering. The design consists two unit cells, "0" "1", which have a 180° ± 37° phase difference for interference cancellation. 10 dB monostatic RCS reduction frequency range from 6.4 to 29.6 GHz, its bandwidth ratio 4.62:1, under normal incidence polarizations. Compared planar surface, surface has greater with...

An approach to generate flat optical frequency comb (OFC) is proposed and experimentally demonstrated using a single integrated dual-polarization quadrature phase shift keying (DP-QPSK) modulator. By adjusting six dc bias points two modulation indices of the modulator, OFC with adjustable number exactly same intensity can be theoretically generated according equations derived from DP-QPSK model. Experimental results show that generator produce 7, 9, 11, 13 lines spectral flatness 0.96, 1.13,...

A novel approach for photonic generation of a frequency-quadrupled phase-coded signal using optical carrier shifting and balanced detection is proposed demonstrated. The key component the scheme an integrated dual-polarization quadrature phase shift-keying (DP-QPSK) modulator. In modulator, RF applied to upper QPSK modulator generate high-order sidebands, while electrical coding bottom perform shifting. After that, with exact π-phase shift generated through detection. has simple, compact...

Radar warning receiver (RWR) plays a significant role in detecting weapon radar. The instantaneous frequency measurement (IFM) section with fast measuring response, large bandwidth, moderate accuracy, and sensitivity is important for an all-threat-covered RWR. In this IFM method, phase modulator (PM) combination differentiation structure employed to get rid of the DC drifting makes power response strict monotonous function input frequency. Therefore, unambiguous determination can be made...

A novel analog photonic link with enhanced spurious-free dynamic range (SFDR) based on an integrated electro-optic dual-polarization modulator is presented and demonstrated. The modulator, which consists of a polarization beam splitter, combiner, two z-cut LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> MZMs, can achieve complementary intensity modulation along the orthogonal directions different indexes. By properly adjusting...

Early radar warning is a significant step to lessen the fine scanning range of receiver. The small size two-dimension (2-D) angle-of-arrival (AOA) estimation part with moderate accuracy and sensitivity important for an early In our method, we specially design L-shaped antenna array (L-sAA) connect it dual-polarization binary phase shift keying modulator (DP-BPSKM). dual-sideband (DSB) modulation performed transfer most optical power electrical, so as increase sensitivity. It also possible...

We proposed a compact and efficient polarization rotator (PR) based on an asymmetric hybrid plasmonics waveguide (HPW) the lithium-niobate-on-insulator (LNOI) platform. focus design of rotation angle balance between two modes. The presented device exhibits extinction ratio as high 59.58 dB insertion loss 1.44 with length only 13.7 μm. fabrication tolerances suitable process are also discussed to meet state-of-art technology.

This study investigated the effect of dislocation density on microstructural transformation and mechanical properties Fe-7.23Mn-4.42Al-0.09C-1.99Si (wt.%) steel. By tempering treatment, was reduced. The plasticity steel analyzed. reduced from 2.3 × 10 −16 m −2 to 1.6 by tempering. Reducing in metastable austenite resulted a higher rate. And low steels exhibited longer strain length during tensile deformation. It obvserved that test decreased 30% after tempering, rate increased 53.3%,...

In this article, a reconfigurable mixer based on only one dual-polarization quadrature phase shift -keying modulator (DP-QPSKM) is proposed and comprehensively demonstrated for radio-over-fiber (RoF) system. By changing the detection unit adjusting dc voltages, single-ended, double-balanced, image (IM)-free, mixing spurs suppressed, dispersion-immune can be implemented. Experimental results show that ~60-dB IM rejection ratio spur suppression are achieved. Moreover, dispersion-induced power...