A photonics-based radar with generation and de-chirp processing of broadband linear frequency modulated continuous-wave (LFMCW) signal in optical domain is proposed for high-resolution real-time inverse synthetic aperture (ISAR) imaging. In the system, a LFMCW generated by photonic quadrupler based on single integrated electro-optical modulator, echoes reflected from targets are de-chirped to low microwave mixer. The can operate at high large bandwidth, thus achieve an ultra-high range...

Real-time and high-resolution target detection is highly desirable in modern radar applications. Electronic techniques have encountered grave difficulties the development of such radars, which strictly rely on a large instantaneous bandwidth. In this article, photonics-based real-time high-range-resolution proposed with optical generation processing broadband linear frequency modulation (LFM) signals. A LFM signal generated transmitter by photonic quadrupling, received echo de-chirped to low...

A scheme for photonic generation of linearly chirped microwave waveforms (LCMWs) with a large time-bandwidth product (TBWP) is proposed and demonstrated based on an optically injected semiconductor laser. In the system, laser operated in period-one (P1) oscillation state. After optical-to-electrical conversion, signal can be generated its frequency determined by injection strength. By properly controlling strength, LCMW TBWP generated. The system has simple compact structure. Besides, center...

A scheme to generate a flat optical frequency comb (OFC) with fixed phase relationship between the lines is proposed and experimentally demonstrated based on cascaded polarization modulator (PolM) modulator. Because PolM introduces more controllable parameters compared conventional intensity modulator, 9, 11, 13 can be generated relatively low RF powers, or 15, 17, 19 obtained if high powers are applied. The OFCs have flatness of 1, 1.3, 2.1 dB, respectively. requires no DC bias modulators,...

A photonics-based multiple-input-multiple-output (MIMO) radar is proposed and demonstrated based on wavelength-division-multiplexed broadband microwave photonic signal generation processing. The has a large operation bandwidth, which helps to achieve an ultra-high range resolution. Compared with monostatic radar, improved performance extended applications originated from the MIMO architecture can be achieved. In addition, low-speed electronics real-time processing capability feasible. 2 ×...

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...

Photonics-based radar with a photonic de-chirp receiver has the advantages of broadband operation and real-time signal processing, but it suffers from interference image frequencies other undesired frequency-mixing components, due to single-channel real-valued frequency mixing. In this paper, we propose photonics-based frequency-doubling transmitter balanced in-phase quadrature (I/Q) receiver. This transmits linearly frequency-modulated signals generated by doubling performs I/Q de-chirping...

A simple scheme for the generation of full-duty-cycle triangular pulses is proposed and experimentally demonstrated using a dual-parallel Mach-Zehnder modulator driven by single-frequency RF signal. By properly setting bias voltages power, even-order harmonics in optical intensity are suppressed, amplitude first-order harmonic 9 times that third-order harmonic. periodical pulse train obtained time domain. 2.5, 5, 10 GHz trains generated, which verifies feasibility scheme.

A photonic approach to generating dual-band linear frequency modulation (LFM) signal is proposed based on optical quadrupling and polarization multiplexing. This achieved by using an integrated multiplexing dual-parallel Mach-Zehnder modulator perform in two orthogonal polarizations independently. After optical-to-electrical conversion, LFM signals different bands can be generated simultaneously. The scheme has a very simple compact structure. Thanks the technique, high-frequency, wideband...

In this paper, a simple scheme for linear frequency-modulated (LFM) waveform generation based on frequency-sweeping optoelectronic oscillator is proposed and demonstrated. The OEO built up with an optically injected semiconductor laser the oscillation frequency can be tuned by adjusting optical injection strength. By applying strength controller in rapid sweeping, LFM microwave generated. When sweep period of output matches round-trip time cavity, signal quality generated significantly...

An optical true time delay (TTD) unit capable of adding independent delays to multiple RF signals is proposed, which can be used for multi-beamforming in both transmit and receive modes. In the proposed unit, N with different center frequencies are modulated on an frequency comb (OFC). After transmission through a dispersive element, RF-modulated OFC split into paths. each path, line selected by tunable filter. Thanks chromatic dispersion independently-controllable TTDs obtained all Then,...

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...

Abstract Radar is the only sensor that can realize target imaging at all time and weather, which would be a key technical enabler for future intelligent society. Poor resolution large size are two critical issues radar to gain ground in civil applications. Conventional electronic radars difficult address due both issues, especially Ka band or lower. In this work, chip‐based microwave‐photonic based on silicon photonic platform, implement high‐resolution with very small footprint, proposed...

We propose and experimentally demonstrate an approach to generating reconfigurable radar waveforms based on optically injected semiconductor laser. In the proposed system, laser is operated at period-one oscillation state, in which optical output signal containing a microwave modulation intensity generated. After photo detection, frequency-tunable obtained with its instantaneous frequency determined by injection strength and/or detuning between master slave lasers. Since dynamical behavior...

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.

A photonics-based integrated communication and radar system is proposed demonstrated by encoding an amplitude shift keying (ASK) modulation signal onto linear frequency modulated continuous wave (LFMCW) signal. In the experiment, rate of 100 Mbit/s achieved inverse synthetic aperture imaging with a 2D resolution as high as~1.8 cm × 2.0 cm.

Incorporating radar detection and frequency measurement functions within a single system is highly desirable in modern RF applications. In this article, microwave photonic proposed demonstrated to simultaneously realize broadband measurement. By sharing light with ± 2nd-order linear frequency-modulated (LFM) sidebands polarization-division-multiplexing manner, can be realized simultaneously. the transmitter, shared used generate signal that has quadrupled bandwidth compared input electrical...

<title>Abstract</title> Achieving ultra-low propagation loss in optical waveguides is crucial for boosting the quality factor of micro-resonators and large-scale photonic integration. Much effort has been paid to design fabricate multimode reduce scattering at waveguide surfaces. Although various adiabatic curves, including Euler bends, hyperbolic tangent functions, Bezier curves have proposed ensure fundamental mode transmission bending radius, footprint still large because dimensions. In...

A novel and compact photonic microwave downconverter is proposed experimentally demonstrated based on an optoelectronic oscillator (OEO) using a single dual-drive Mach-Zehnder modulator (DMZM). The DMZM used to simultaneously convert the input RF signal into optical signal, form OEO for carrier extraction, downconvert baseband. In experiment, 2-Gb/s NRZ coded 10.66-GHz successfully downconverted addition, receiver wireless high-definition (HD) video transmission built verified downconverter....

A compact scheme for photonic generation of a phase-coded microwave signal using dual-drive Mach-Zehnder modulator (DMZM) is proposed and experimentally demonstrated. In the scheme, radio frequency (RF) carrier coding are sent to two RF ports DMZM, respectively. By properly setting amplitude bias voltage an exact π-phase-shift generated. The has simple structure since only single DMZM required. addition, good tunability achieved because no frequency-dependent electrical devices or...