Nowadays, the microwave photonics (MWP) concept has been evolved from laboratory tests to practical applications, and related techniques have widely deployed in many fields including such as wireless communications, medicine, sensing, radars, electronic warfare, space explorations. In this paper, we concentrate on featured applications of MWP high-speed railways (HSRs), an emerging field massive market, overview about our recent work is presented. The radio-over-fiber based communications...

A novel millimeter-Wave (mm-Wave) joint radar and communication (JRC) system based on photonic spectrum-spreading phase-coding is proposed. The key to the proposed convergence of microwave multiplexing techniques. Phase-coding enables generation wideband mm-Wave JRC signal, leading both high range resolution (< 3.5 cm) for detection capacity (>1 Gb/s) wireless communication. orthogonalizes signal data, highly reducing mutual interferences. In addition, able improve peak sidelobe ratio (PSR)...

The joint radar and communication (JRC) system providing both large-capacity transmission high-resolution ranging will play a pivotal role in the next-generation wireless networks (e.g., 6G beyond) defense applications. Here, we propose experimentally demonstrate novel photonics-assisted millimeter-wave (mm-wave) JRC with multi-Gbit/s data rate for function centimeter-level range resolution function. key is design of intermediate-frequency (IF) signal through angle modulation linear...

Multiband integrated sensing and communication (ISAC) systems towards multiple functions users will play an important pole in future 6G wireless networks. Here, we propose experimentally demonstrate a multiband ISAC system using optical frequency upconversion coherent receiving techniques for millimeter-wave (MMW) high-capacity high-resolution functions. The MMW signals are simultaneously generated by single photonic upconverter consisting of comb, wavelength selective switch, I/Q...

Integrated sensing and communication (ISAC), a key technology for next-generation wireless networks (e.g., 5G-A 6G), aims to provide both large-capacity high-resolution microwave sensing/ranging simultaneously. Microwave photonics (MWP)-ISAC, with its unique features such as high frequency, large bandwidth, low frequency-dependent loss, flat frequency response, fast analog signal processing, strong immunity electromagnetic interference, offers superior performance in terms of data rate...

Scheduling radar and communication functions in a frequency-division multiplexing (FDM) fashion is classic solution to achieve mutual-interference-free integrated sensing (ISAC) system. However, it haunted by poor spectral efficiency (SE) comparison the spectrum-sharing scheme. In this article, we propose novel photonics millimeter-wave ISAC system reaping FDM scheme while offering inspirations for significantly enhancing SE using super-resolution techniques. Using coherent fusion processing...

A millimeter-wave (MMW) joint radar-communication (JRC) system with super-resolution is proposed and experimentally demonstrated, using optical heterodyne upconversion self-coherent detection downconversion techniques. The point lies in the designed coherent dual-band constant envelope linear frequency modulation-orthogonal division multiplexing (LFM-OFDM) signal opposite phase modulation indexes for JRC system. Then detection, as a simple low-cost means, accordingly facilitated both...

For civil and military applications, the ability to instantaneously capture process wideband RF (radio-frequency) signal is of great importance. In this paper, a novel photonics-assisted channelized receiver aiming for instantaneous broadband reception proposed experimentally demonstrated. The channelizer composed two branches. one branch, an optical frequency comb (OFC) generated through phase modulator (PM), while in other carrier frequency-shifted via polarization (PolM) then modulated by...

Nonlinear equalization (NE) plays a pivotal role in the analog intermediate-frequency over fiber (IFoF) mobile fronthaul (MFH) system demanding high signal fidelity. This work proposes and experimentally validates novel blind frequency-domain NE (FD-NE) approach for millimeter-wave (MMW) fiber-wireless (FiWi) IFoF MFH systems. proposed FD-NE scheme relies on FD two-block cascade Hammerstein structure particular pairs of M-ary phase shift keying (MPSK) amplitude (MASK) subcarriers. It...

A novel 60-GHz millimeter-wave (mm-wave) joint radar-communication system using the photonic techniques is proposed and experimental demonstrated. Photonic generation de-chirping of mm-wave ultra-wideband linearly frequency modulated continuous wave (LFMCW) radar signals are achieved through optical comb, heterodyne detection mixing. The on-off keying (OOK) signal directly onto LFMCW for high-capacity wireless communication. In experiments, resolution range measurement observed as 1.8-cm a 1...

Developing generic and self-adaptive methods to alleviate the nonlinearity issues remain of high importance for various microwave photonic (MWP) systems. Here, we propose experimentally demonstrate a new digital linearization strategy meet requirements above. The key our proposal lies on revealing that dominant third-order nonlinear distortions (ND3s) have ∼π phase deviation with respect fundamental signals in analog MWP systems (e.g., links, filters, mixers). By leveraging this peculiarity,...

In this paper, we propose a stable radio frequency(RF) transmission scheme for optical link based on Dual drive Mach-Zehnder modulator(DDMZM). By frequency mixing, the phase jitter of output signal caused by environment variation has been automatically compensated. Different from other passive compensation schemes, reference and pre-compensation are modulated one carrier DDMZM, crosstalk two RF signals can be depressed using dispersion adjusting bias voltage without multiple multiplications...

A bidirectional wavelength division multiplexing (WDM) analog radio-over-fiber (A-RoF) mobile fronthaul (MFH) link is enhanced using photonic integrated devices. Two key devices are combined in the A-RoF link: an 8-channel InP directly modulated laser (DML) transmitter and a 32×100-GHz silicon array waveguide grating (AWG). The DML has 8 parallel monolithically distributed feedback lasers, enabling cooperative reconfigurable downlink transmission. Moreover, AWG featured by low insertion loss...

To improve the receiver sensitivity of digitized radio-over-fiber (DRoF) transmission system, a vector quantization scheme based on probabilistic codeword shaping (PQCS) is proposed. The PQCS performs bits (QBs) rematching original codebook to optimize proportion distribution level '0' and '2' in 4-Pulse Amplitude Modulation (PAM-4) for improving system sensitivity. A 16-Quadrature (16-QAM) DRoF using intensity-modulation/direct-detection employed experimentally verify proposed scheme....

Highly reliable wireless train-ground communication immune to the electromagnetic interferences (EMIs) is of critical importance for security and efficiency high-speed railways (HSRs). However, rapid development HSRs (&gt;52,000 km all over world) brings great challenges on conventional EMIs mitigation strategies featuring non-real-time passive. In this paper, convergence radio-over-fiber distributed antenna architecture (RoF-DAA) reinforcement learning technologies explored empower a...

We here propose a novel cost-effective millimeter-level resolution photonic multiband radar system using single MZM driven by 1-GHz-bandwidth LFM signal. It experimentally shows an ~8.5-mm range through coherence-processing-free data fusion.

In the field of high-speed railways (HSRs), electromagnetic interference (EMI) to wireless train-ground communication system (e.g., GSM-R for train scheduling and dispatching) severely reduces operational efficiency even results in accidents. The direction-of-arrival (DoA) estimation EMI is crucial detection removal. A photonics-assisted proposed estimate DoA along HSRs a remote real-time mode. scheme featured by simultaneous location (DoA estimation) EMI, with advantages strong immunity,...

An extended long-short ambiguity resolution (AR) approach to multi-antenna GNSS-over-fiber systems is proposed and experimentally demonstrated, providing enhanced attitude determination. GNSS signals are remotely acquired from M antennas then transferred a central node. Through virtual baseline processing, multiple baselines with intermediate length constructed. Consequently, although the adjacent ratio limited, overall aperture expanded. The carrier phase measurements of equal averaged by...

We here propose a novel cost-effective millimeter-level resolution photonic multiband radar system using single MZM driven by 1-GHz-bandwidth LFM signal. It experimentally shows an ~8.5-mm range through coherence-processing-free data fusion.

Photonics-enabled multi-chirp-rate & multi-band converged inverse synthetic aperture radar (ISAR) is proposed. The convergence brings a wide equivalent bandwidth, and more importantly the lends to greatly simplified receiver hardware (Multiple in One). An integrated photonic prototype fabricated via lithium-niobate-on-insulator (LNOI) platform, wherein one modulator with ultra-low half-wave voltage for generating signal other de-chirping this signal. In experiment, linearly frequency...

A training-free blind digital linearization algorithm is proposed for the off-quadrature biased MZM analog optical link desiring high linearity and multi-octave operation bandwidth. Simultaneous suppression of IMD2 IMD3 by ~20 dB experimentally demonstrated.