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 ×...

Microwave photonic (MWP) frequency-modulated continuous-wave (FMCW) radars break through the bandwidth limitations of electronic radar by frequency multiplication and mixing. However, it induces additional phase noise to signal, which is undesirable for target detection recognition. To deal with this issue, paper presents experimentally demonstrates a MWP FMCW suppressed equal interval sampling. The broadened multiplier, split into two paths. One path delayed optical fiber as reference other...

A photonics-based broadband phased array radar is demonstrated to realize high-resolution imaging based on digital beamforming. This can achieve a high range resolution enabled by large operation bandwidth, and squint-free beam steering true time delay (TTD) compensation. In addition, the photonic dechirp processing applied in receiver alleviate hardware requirements for data sampling storage, hence remarkably enhance real-time signal capability. proof-of-concept experiment, target 1 × 4...

Optical vector analysis (OVA) having the capability to achieve magnitude and phase responses is essential for fabrication application of emerging optical devices. However, conventional OVA often have make compromises among resolution, dynamic range bandwidth. Modulation-based promises ultra-high resolution but suffers from measurement errors due modulation nonlinearity, narrow bandwidth restricted by employment microwave optoelectronic devices, difficulties in measuring devices with deep...

A frequency tunable short optical pulse generation scheme based on a self-starting optoelectronic oscillator (OEO) with an optically injected semiconductor laser is proposed and investigated. The of pulses repetition rate coarsely tuned from 6.5 to 15 GHz are demonstrated. Phase noise the electrical clock signal OEO below -101 dBc/Hz at 10 kHz within whole tuning range, which leads very small timing jitter generated pulses. Assisted by compression technique in OEO, full-width-at half-maximum...

A microwave photonic multiple-input and multiple-output (MIMO) radar is proposed demonstrated to implement high-resolution imaging. In the system, multiple orthogonal linearly frequency modulated (LFM) signals are generated by heterodyning between two optical combs, which enables a MIMO transmitting array with simple reconfigurable structure. The receiving uses mixing channel separation de-chirp processing simultaneously. This can have large operation bandwidth equivalent aperture, helps...

A photonics-based time division multiplexing (TDM) multiple-input and multiple-output (MIMO) radar is proposed to realize high-resolution imaging. In this MIMO radar, multiple transmitters generate time-domain orthogonal linearly frequency modulated (LFM) signals based on microwave photonic octupling optical TDM technique, receivers implement dechirping of the multi-channel echoes mixing. The techniques make system capable process broadband signals, yields a high spectral efficiency, which...

A novel scheme for photonic generation of a phase-coded microwave signal is proposed and its application in one-dimension distance measurement demonstrated. The generator has simple compact structure based on single dual-polarization modulator. Besides, the generated stable free from DC low-frequency backgrounds. An experiment carried out. 2 Gb/s at 20 GHz successfully generated, recovered phase information agrees well with input 13-bit Barker code. To further investigate performance...

A novel triangular pulse generator is proposed based on a polarization multiplexed optoelectronic oscillator (OEO). Employing dual-polarization modulator, the OEO can simultaneously oscillate at two frequencies of f and 3 along orthogonal polarizations same optical carrier. Thanks to harmonic injection coupling between oscillations, generated signals have an exact frequency ratio 1:3 be tuned in phase with each other. By properly setting amplitudes signals, train generated. The generation...

A 2-bit photonic digital-to-analog conversion unit is proposed and demonstrated based on polarization multiplexing. The converter (DAC) realized by optical intensity weighting summing, its complexity greatly reduced compared with the traditional DACs. Performance of DAC experimentally investigated. established achieves a good linear transfer function, effective number bits calculated to be 1.3. Based unit, two structures higher (>2) bit resolutions are discussed, system expected half using technique.

Photonics-based high-resolution 3D radar imaging is demonstrated in which a convolutional neural network (CNN)-assisted back projection (BP) method applied to implement fast and noise-resistant image construction. The proposed system uses 2D array with each element being broadband transceiver realized by microwave photonic frequency multiplication mixing. CNN-assisted BP construction achieved mapping low-resolution images pre-trained CNN, greatly reduces the computational complexity enhances...

This letter proposes a time-domain waveform synthesis based on dual-polarization modulator that is driven by single-frequency radio frequency signals. achieved applying to generate polarization multiplexed optical signal. By controlling the parameters of driving signals, multiple waveforms can be generated synthesizing intensity profiles along two orthogonal states. Compared with previously reported signal generators, proposed synthesizer simple, compact, and easy implement. The generation...

A two-tone radio frequency (RF) signal generator realized by a polarization multiplexed optoelectronic oscillator (OEO) is proposed and demonstrated. The OEO employs dual-polarization modulator can simultaneously generate two tones through oscillations in orthogonal polarizations of the same optical carrier. Frequencies be tuned independently adjusting electrical filters. Advantage system that, interference between effectively suppressed isolation multi-frequency intermodulation single...

A phase stable radio frequency (RF) distribution technique is proposed and experimentally demonstrated. The system transmits optical comb lines through an optic cable with multiple fibers. At the receiver, RF variation removed by mixing based on conjugation. In system, round-trip transmission implemented different fibers, thus signal degradation due to bidirectional fiber eliminated. Besides, electrical manipulations are not required because components can be generated beating at a...

A photonics-based multiband radar is proposed based on an optical frequency sweeping comb and photonic dechirp receiving. The has a simple structure, it capable to simultaneously generate process multiple linear modulation (LFM) signals in different bands. Besides, the receiver can achieve fast or real-time signal processing with low-speed electronics. In proof-of-concept experiment, dual-band working K-band (19-22 GHz) Ka-band (34-37 demonstrated bandwidth of 3 GHz each band sampling rate...

In recent years, microwave photonic technologies have been applied to overcome the bandwidth limitation of traditional radars. Previously reported photonics-based radars can achieve a high range resolution up centimeter-level. However, due unavailability suitable wideband Radio Frequency (RF) front-ends and strict regulation frequency usage in electromagnetic (EM) spectrum, practical applications are still challenging. Multiband radar fusion is promising solution these problems, which...

A serial photonic digital-to-analog converter (PDAC) is proposed and demonstrated. The established 4-bit PDAC has a good linearity the effective number of bits reaches 3.49. Based on PDAC, generation cosine, triangular, sawtooth, parabolic square waveforms implemented with performance.

A serial photonic digital-to-analog converter (PDAC) is proposed based on optical time and wavelength interleaving processing. In the system, an intensity weighted, interleaved pulse train generated by phase modulation fiber dispersion. The obtained pulses are on-off keying modulated input digital bit stream. After dispersion compensation, signal with power proportional to weighted sum of bits stream obtained, conversion implemented. Compared previous PDACs, system complexity cost reduced....

Optoelectronic oscillator (OEO) is a promising technique with various applications for high quality microwave generation and signal processing in electro-optical systems. Traditional OEOs are mainly focused on single-frequency oscillation its applications, while the agility of multi-frequency rarely reported. In this report, we concentrate realization application OEOs, which can simultaneously oscillate at multiple frequencies within single OEO system. Compared by individual has apparently...

A 2-bit photonic digital-to-analog conversion unit is proposed and experimentally demonstrated based on polarization multiplexing. It can be used to construct higher resolution DACs the complexity expected reduced by half.

Photonics-based radar enables high range resolution detection by using photonic techniques to generate and process broadband linearly-frequency-modulation (LFM) signals. By incorporating the multiple input output (MIMO) technique a photonics-based radar, azimuth can be improved. In this report, MIMO is presented high-resolution 3D imaging capability demonstrated. The built 4×4 has bandwidth of 2 GHz in each channel. images three corner reflectors are successfully constructed applying...

The emerging photonics-based radar breaks the bandwidth limitations of traditional radar, making it possible to achieve a high range resolution. While, angular resolution is still limited by size its equivalent aperture. To both and resolution, we propose super-resolution detection method that achieved phased array applying two-dimensional multiple signal classification (2D-MUSIC) algorithm. broad enabled system can ensure 2D-MUSIC helps Feasibility proposed experimentally verified through...

A frequency tunable two-tone radio (RF) signal generator is proposed based on a polarization multiplexed optoelectronic oscillator (OEO). The system has simple structure using one laser source and integrated modulator. Frequencies of the generated two tones can be independently tuned by simply adjusting electrical filters. Besides, optical interference as well gain competition between oscillating frequencies suppressed to achieve stable operation. An experiment carried out. successfully at...

Photonics-based radar enables high range resolution detection by using photonic techniques to generate and process broadband linearly-frequency-modulation (LFM) signals. By incorporating the multiple input output (MIMO) technique a photonics-based radar, azimuth can be improved. In this report, MIMO is presented high-resolution 3D imaging capability demonstrated. The built 4×4 has bandwidth of 2 GHz in each channel. images three corner reflectors are successfully constructed applying...