An optically tunable optoelectronic oscillator (OEO) with a wide frequency range incorporating microwave photonic filter implemented based on phase-modulation to intensity-modulation conversion using phase-shifted fiber Bragg grating (PS-FBG) is proposed and experimentally demonstrated. The PS-FBG in conjunction two optical phase modulators the OEO loop form high-Q, wideband frequency-tunable bandpass filter, achieve simultaneously single-frequency selection tuning. Since tuning of achieved...

A novel approach to implementing a narrow-passband and frequency-tunable microwave photonic filter (MPF) based on phase-modulation intensity-modulation conversion in phase-shifted fiber Bragg grating (PS-FBG) is proposed experimentally demonstrated. In the MPF, phase-modulated signal sent PS-FBG. If one of sidebands falls notch PS-FBG, converted an intensity-modulated signal. Due ultra-narrow with passband realized. The tunability achieved by tuning wavelength optical carrier. theoretical...

A microwave photonic synthetic aperture radar (MWP SAR) is developed and experimentally demonstrated. In the transmitter, frequency doubling used to generate a linearly-frequency-modulated (LFM) signal; while in receiver, stretch processing employed receive reflection signal. The presented MWP SAR operates Ku band with bandwidth of 600MHz, evaluated through series inverse imaging tests both anechoic chamber field trial. Its performance verifies that proposed works perfect shows potential...

Besides distinct features on RF/optical signal generation, optoelectronic oscillators (OEOs) have also been rapidly developed as emerging techniques towards sensing, measurement, and detection. In this paper, we start with the conceptual architecture analytical model of OEOs. Then, three operation principles behind detection applications are categorized, including variation time delay loop, passband reconfiguration microwave photonic filter in oscillation gain from injection locking, which...

Microwave frequency multiplication based on external modulation using two cascaded Mach-Zehnder modulators (MZMs) has been considered an effective solution for high-frequency and frequency-tunable microwave signal generation. Different techniques have demonstrated recently, but no generalized approach developed. In this paper, a to achieving MZMs is presented. A theoretical analysis leading the operating conditions achieve quadrupling, sextupling, or octupling The system performance in terms...

A photonic-assisted microwave channelizer with improved channel characteristics based on spectrum-controlled stimulated Brillouin scattering (SBS) is proposed and experimentally demonstrated. In the system, N lightwaves from a laser array are multiplexed then split into two paths. upper path, modulated by signal its frequency to be measured. lower for each lightwave, wavelength shifted specific shorter via carrier-suppressed single-sideband modulation spectrum shaped. The wavelength-shifted...

An active integrated broadband photonics multi-beamformer using optical true-time delay induced Blass matrix is designed and demonstrated. The constructed on a standard silicon-on-insulator platform, incorporating on-chip modulator array photodetector alongside multi-beamforming network. network utilizes architecture based to precisely control the power of input microwave signals. Furthermore, wavelength division multiplexing technology achieved by multi- lasers used decouple signals from...

An optically tunable optoelectronic oscillator (OEO) implemented by employing a two-port optical phase modulator without using any electronic microwave filters is proposed and experimentally demonstrated. The key device in the system modulator, which functions, conjunction with dispersive element loop, to form high-Q filter perform frequency selection. central of function wavelength chromatic dispersion element, therefore, oscillation can be simply tuned tuning laser source or element. A...

A novel approach to achieving microwave frequency octupling in the optical domain is proposed and demonstrated. The system consists of two cascaded Mach-Zehnder modulators (MZMs) that are both biased at maximum transmission point, with a tunable phase shifter connected between introduce shift. An input signal applied MZMs its power adjusted ensure having an identical modulation index. theoretical analysis leads conditions for provided. verified by experiments. noise performance tunability...

Photonic generation of a phase-coded or frequency-chirped microwave waveform with tunable carrier frequency using frequency-tunable optoelectronic oscillator (OEO) is proposed and experimentally demonstrated, for the first time to best our knowledge. In system, OEO has functions generate signal output an optical sideband. The sideband portion light wave from laser source are sent polarization modulator (PolM), their directions aligned two principal axes PolM. An electrical applied PolM,...

Photonic generation of a linearly chirped microwave waveform with an increased time-bandwidth product (TBWP) based on frequency-tunable optoelectronic oscillator (OEO) and recirculating phase modulation loop (RPML) is proposed experimentally demonstrated, for the first time to best our knowledge. In system, continuous-wave (CW) light wave divided into two parts: one sent tunable OEO generate signal other intensity-modulated by switching at intensity modulator form chirp-free optical pulse,...

We propose and experimentally demonstrate a fiber-optic sensor implemented based on dual-frequency optoelectronic oscillator (OEO) for transverse load sensing. In the OEO loop, phase-shifted fiber Bragg grating (PS-FBG) is employed to which applied introduce birefringence create two orthogonally polarized notches, leads generation of oscillating frequencies. The beat frequency between frequencies function force PS-FBG. proposed demonstrated. sensitivity minimal detectable are measured be as...

Based on chirped pulses, a wideband radio frequency (RF) channelized receiver that can easily support hundreds of channels is proposed. The mixing pulses and its own delayed copy produces an equivalent RF local oscillation (LO). LO be changed by simply setting the delay between two paths. Channelized receiving broadband signals realized parallel line arrays. Meanwhile, use in-phase/quadrature demodulation avoids extra optical or electrical filtering as well image interference. A with channel...

Abstract A Fourier transform spectrometer (FTS) is recognized as a highly precise analytical instrument for analyzing the constituent elements of matter in fields physics, chemistry, aerospace, and so on. With emergence development miniaturized portable devices numerous scientific technological fields, there has been an urgent need on‐chip FTSs due to their benefits small size, portability, low energy consumption, robustness. However, size hinders acquisition large optical path difference,...

The next generation of synthetic aperture radar (SAR) systems will need transmit and receive analog signals over a wide frequency range with large bandwidth to fulfil the increasing demands. Since performance digital microwave component is deteriorated at frequency, radio (RF) front-end capability conversion needed for beyond few gigahertz. However, widely employed RF mixers, inherent imperfect I-V characteristics nonlinear devices, generates many undesired mixing spurs, which restricts on...

A novel approach to generating an optical frequency comb based on repeated shifting is proposed and experimentally demonstrated. The implemented via carrier suppression single-sideband modulation using two Mach-Zehnder modulators in conjunction with a bidirectional asymmetric interferometer wavelength-shifted transmission spectra along the opposite directions. theoretical analysis performed, which confirmed by proof-of-concept experiment. stable covering spectral range of 0.18 THz generated.

We propose and experimentally demonstrate a photonic approach to the measurement of time-difference-of-arrival (TDOA) angle-of-arrival (AOA) microwave signal. In proposed system, TDOA AOA are equivalently converted into phase shift between two replicas signal received at cascaded modulators. The light wave from CW laser is externally modulated by first modulator, which biased suppress optical carrier, leading generation first-order sidebands, further phase-delayed second modulator. Two...

High-resolution Doppler frequency shift (DFS) estimation in a wide range is essential for radar, microwave/millimeter-wave, and communication systems. In this paper, photonic approach to DFS proposed experimentally demonstrated, providing high-resolution frequency-independent solution. the approach, between transmitted microwave signal received echo mapped into doubled spacing two target optical sidebands by using cascaded electrooptic modulators. Subsequently, then estimated through...

A grating-based Fabry-Perot (FP) cavity-coupled microring resonator on a silicon chip is reported to demonstrate an all-optically tunable Fano resonance. In the device, add-drop (MRR) employed, and one of two bus waveguides replaced by FP cavity consisting sidewall Bragg gratings. By choosing parameters gratings, resonant mode coupled modes MRR. Due coupling between modes, resonance with asymmetric line shape resulted. Measurement results show extinction ratio 22.54 dB, slope rate 250.4...

Target recognition in synthetic aperture radar (SAR) imagery suffers from speckle noise and geometric distortion brought by the range-based coherent imaging mechanism. A new SAR target system is proposed, using a SAR-to-optical translation network as pre-processing to enhance both automatic manual recognition. In system, images of targets are translated into optical modified conditional generative adversarial (cGAN) whose generator with symmetric architecture inhomogeneous convolution...

A novel approach to achieving photonically assisted microwave frequency twelvetupling with large tunability is proposed and demonstrated. The realized through a joint operation of polarization modulation, four-wave mixing, stimulated-Brillouin-scattering-assisted filtering. key significance the technique that system capable realizing simple tuning over wide range. An experiment performed. electrical signal tunable from 48 132 GHz generated.

A novel microwave photonic link (MPL) with an improved spurious-free dynamic range (SFDR) based on a bidirectional use of polarization modulator (PolM) in Sagnac loop is proposed and demonstrated. The PolM the functions, conjunction controller beam combiner, as Mach Zehnder (MZM), which only modulates incident light wave along clockwise direction, leaving counter-clockwise unmodulated due to velocity mismatch. Two intensity-modulated signals two paths (Path 1 Path 2) are generated, one...

A novel configuration for a dual-wavelength fiber ring laser with improved lasing stability realized through the use of an injection-coupled optoelectronic oscillator (OEO) is proposed and demonstrated, its application to transverse load sensing studied. The OEO-coupled has two mutually coupled loops: loop OEO loop. In loop, polarization-maintaining phase-shifted Bragg grating incorporated generate optical wavelengths wavelength spacing determined by birefringence (PM) fiber. microwave...

A novel reconfigurable microwave photonic (MWP) radar has been proposed and experimentally demonstrated. At a transmitting end, signal with large bandwidth ultra-low phase noise is generated by Fourier domain mode locking optoelectronic oscillator. receiving photonics-based de-chirp processing implemented phase-modulating light waves in dual-drive Mach-Zehnder modulator mixing the modulated at photodetector. Without requirement of external RF sources, developed photonics-assisted...