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Photonic compressive sensing is a promising data compression method and has been successfully applied in high-speed RF signal detection with greatly reduced requirement for receiver bandwidth. A key challenge is due to the electronic bottleneck in high-speed random sequence generation and mixing. In this work, we propose and experimentally demonstrated for the first time all-optical random sequence...
A security-enhanced chaos communication scheme by expanding and compressing the spectrum of modulated chaotic carrier is proposed, in virtue of a spectrum expansion module composed of two phase modulators and two dispersion mediums. The numerical results demonstrate that the efficient bandwidth of modulated chaotic carrier can be expanded up to several tens of GHz and the RF spectrum is uniformly...
We have theoretically analyzed the diffractive characteristics of radiation mode of 45° tilted fiber gratings. The simulated angular dispersion for the 45 ° TFG with 748nm period at 1550nm is around 0.053°/nm, which is quite close to the experimental result.
Data compressed photonic time stretch optical coherence tomography system enables high speed signal detection with reduced bandwidth requirement for backend electronic and digitizers. However, the measurement resolution is inherently dependent on the repetition rate of mode-locked laser. This work reports a new approach to improve depth profile resolution based on dual pulse integration. In our experimental...
Photonic time stretch enables real-time optical coherence tomography, but at the cost of extreme requirement for high-speed signal acquisition and massive data set. This work reports a data compressed real-time Fourier-domain optical coherence tomography based on photonics-assisted compressive sensing. Compression ratio of 66% is achieved.
A novel approach to sensing broadband radio frequency (RF) spectrum beyond the Nyquist limit based on photonic temporal channelization and compressive sensing is proposed. A spectrally-sparse RF signal with unknown frequencies is modulated onto a highly chirped optical pulse. An optical channelizer slices the modulated pulse spectrum, which is equivalent to temporally sampling the RF waveform thanks...
We report an ultrafast surface inspection method using a hybrid dispersion laser scanner. Using the technique, we demonstrate real-time detection of microparticles on silicon wafer surfaces at 1,000 times higher scan rates than conventional methods.
High resolution microwave frequency measurement based on temporal channelization using a mode-locked laser is proposed and demonstrated. In the proposed system, a highly chirped optical pulse is modulated by a microwave signal with its frequency to be measured. The temporal microwave waveform is then mapped to the spectral domain thanks to dispersive Fourier transformation in a dispersive fiber. An...
We report the first experimental demonstration of dispersive Fourier transformation in the industrially and biomedically important spectral range of ∼800-nm using a chirped fiber Bragg grating and discuss its utility to high throughput biological diagnostics.
In this paper, we demonstrate a simple method for the full characterization of an ultrashort optical pulse based on temporal interferometry using an unbalanced temporal pulse shaping (UB-TPS) system. The UB-TPS system is functioning to generate and stretch two time-delayed replicas of the input pulse. The magnitude and phase information of the input pulse is reconstructed from the recorded temporal...
We propose a novel technique to implement microwave arbitrary waveform generation (AWG) in the optical domain based on simultaneous optical spectral shaping and wavelength-to-time mapping in a single linearly chirped fiber Bragg grating (LCFBG). In the proposed approach, the spectrum of an ultrashort optical pulse generated by a mode-locked fiber laser is spectrally shaped and at the same time wavelength-to-time...
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