As the only method for all-weather, all-time and long-distance target detection recognition, radar has been intensively studied since it was invented, is considered as an essential sensor future intelligent society. In past few decades, great efforts were devoted to improving radar's functionality, precision, response time, of which key generate, control process a wideband signal with high speed. Thanks broad bandwidth, flat response, low loss transmission, multidimensional multiplexing,...

Microwave measurement refers to the acquisition of parameters a microwave signal or identification properties an object via microwave-based approaches. Thanks broad bandwidth and high speed provided by modern photonics, in optical domain can provide better performance terms which may not be achievable using traditional, even state-of-the-art electronics. In this tutorial, techniques for photonics-based broadband high-speed are discussed with emphasis on system architectures parameter...

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...

Software-Defined Satellite Payloads Based on Microwave Photonics! communication offers a number of distinct features that are not readily available with other means communication, such as seamless coverage remote and sparsely populated areas, reliable data relay for deep-space exploration, inherent multicasting broadcasting capabilities, performance in extreme conditions (e.g., war, earthquakes, adverse events) [1], [2]. In recent years, the steep rise mobile multimedia applications...

Wideband and frequency-tunable microwave signal generation using an optoelectronic oscillator incorporating a Fabry-Perot laser diode (FP-LD) with external optical injection is proposed demonstrated. Through injection, the FP-LD functions as tunable high-Q photonic filter, frequency tuning realized by either wavelength of externally injected light or changing temperature to adjust longitudinal modes FP-LD. An experiment performed; from 6.41 10.85 GHz generated. The phase noise performance...

A novel microwave photonic phase shifter based on a single-sideband (SSB) polarization modulator (PolM) and polarizer is proposed demonstrated. In the SSB-PolM, two SSB intensity-modulated signals with difference of π along orthogonal directions are generated. With to combine signals, optical signal can be tuned from -180 180 deg by simply adjusting direction polarizer, whereas amplitude keeps unchanged. An experiment carried out. full-range tunable shift in frequency range 11-43 GHz...

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 high resolution optical vector network analyzer (OVNA) implemented based on a wideband and wavelength-tunable single-sideband (OSSB) modulator is proposed experimentally demonstrated. The OSSB modulation achieved using phase tunable filter with passband having two steep edges flat top. Wideband achieved. incorporation of the into OVNA evaluated. measurement magnitude response an ultra-narrow-band fiber Bragg grating (FBG) that stimulated Brillouin scattering (SBS) in single-mode performed....

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 scheme for the generation of phase-coded microwave signals using an electrically tunable photonic phase shifter is proposed and demonstrated. The based on a single-sideband polarization modulator (PolM), tuning implemented by second PolM. By introducing RF signal to first PolM electrical coding PolM, with binary codes or polyphase achieved. An experiment performed. simple flexible operation, high rate, large frequency range, excellent transmission performance, stability system confirmed.

Abstract Photonics‐based microwave frequency mixing provides distinct features in terms of wide coverage, broad instantaneous bandwidth, small frequency‐dependent loss, and immunity to electromagnetic interference as compared with its electronic counterpart, which can be a key technical enabler for future broadband multifunctional RF systems. Herein, all‐optical optoelectronic techniques are reviewed, an emphasis on the latest advances photonics‐based mixers improved performance conversion...

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 ×...

A reconfigurable photonic microwave mixer is proposed using a 90° optical hybrid. To perform the mixing, an carrier split into two branches. One portion intensity-modulated by RF or intermediate frequency signal, and other driven local oscillator (LO). Each generates sideband. The sidebands from branches are introduced to signal port LO of hybrid which typically has four output ports, namely, I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

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...

Cognitive radio is considered as a possible disruptive force to improve the spectral resource efficiency through sensing and interacting with environment. Traditional electrical technologies implement cognitive face challenges in terms of bandwidth, resolution, speed. In this paper, concept architecture broadband systems enabled by photonics are proposed. Key microwave photonic techniques for reviewed, including photonics-based spectrum sensing, arbitrary waveform generation,...

Abstract There has been a rapidly growing demand for low-cost, integrated single-shot spectrometers to be embedded in portable intelligent devices. Even though significant progress made this area, two major problems are still remaining, namely the high temperature sensitivity and poor bandwidth-resolution ratio (BRR) that can’t meet requirement of most applications. In work, we present an spectrometer relying on silicon photonic circuit footprint less than 3mm 2 , but could achieve broad...

Despite the pressing demand for integrated spectrometers, a solution that deliver high-performance while being practically operated is still missing. Furthermore, current spectrometers lack reconfigurability in their performance, which highly desirable dynamic working scenarios. This study presents viable by demonstrating user-friendly, reconfigurable spectrometer on silicon. At core of this innovative programmable photonic circuit capable exhibiting diverse spectral responses, can be...

In the upcoming 6G, integrated sensing and communication (ISAC) system in millimeter wave (MMW) band will have a vital role numerous application scenarios, enhancing convenience of our lives. The photonic-based MMW ISAC can exploit broad bandwidth photonic devices, significantly improving performance. Furthermore, use devices enables seamless integration with fiber-wireless network. this paper, we proposed simple-structured W-band system, incorporating optical fiber transmission into system....

We demonstrated a simple technique to obtain stable room temperature multiwavelength lasing in an erbium-doped fiber laser by the inhomogeneous loss mechanism. Successful reduction of cross-gain saturation was achieved incorporating section highly nonlinear (HNLF) and Fabry-Perot filter (FPF) cavity. More than 70 wavelengths simultaneous were observed with same frequency space 25GHz. The had total output power ~3.2dBm, bandwidth 0.012nm (~1.5GHz) signal-to-spontaneous-noise ratio ~44dB....

The distribution of ultra-wideband (UWB) signals over optical fiber, or UWB fiber (UWBoF), is proposed to extend the area coverage and offer availability undisrupted service across different networks. Various techniques have been reported recently for pulse generation, but study on implementation modulation schemes based these pulses has just started. In addition, influence dispersion power spectral density (PSD) an signal, bit-error-rate performance UWBoF system with not systematically...