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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...
Photonic time stretch enables real-time high-throughput optical coherence tomography (OCT), but with massive data volume being a real challenge. In this paper, data compression in high-throughput optical time-stretch OCT has been explored and experimentally demonstrated. This is made possible by exploiting the spectral sparsity of an encoded optical pulse spectrum using a compressive sensing approach...
Photonic time stretch significantly extends the effective bandwidth of existing analog-to-digital convertors by slowing down the input high-speed RF signals. Non-uniform photonic time stretch further enables time bandwidth product reduction in RF signal detection by selectively stretching high-frequency features more. However, it requires the prior knowledge of spectral-temporal distribution of the...
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...
High-throughput fully distributed fiber Bragg grating (FBG) sensors based on optical time-stretch frequency-domain reflectometry (OTS-FDR) [1] has proved to be a promising tool for high temporal and spatial resolution distributed strain sensing. The dynamic distributed strain information along the FBG sensor can be reconstructed from the instantaneous RF frequency of the captured temporal interference...
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.
We propose a novel all-optical temporal random pattern generation scheme based on photonic time stretch involving cascaded Mach-Zehnder interferometers (MZIs) with different chirped spectral response. The overall spectral response represents a broadband random spectral pattern. Temporal random patterns can then be generated thanks to photonic time stretch which mirrors spectrum encoding to temporal...
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