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A novel scheme to generate ultra-wideband (UWB) signals based on cross-gain modulation (XGM) effect in a DFB laser is proposed. In this scheme, a gain-switched laser (GSL) is used as master laser (ML), the optical pulses are optically injected into a DFB laser, which is used as slave laser (SL). By proper system configuration, UWB monocycle, doublet or triplet UWB signals can be generated after detection...
A novel thresholder based on cross-gain modulation (XGM) effect in a distributed-feedback (DFB) semiconductor laser combined with offset optical filtering is proposed and demonstrated. To the best of our knowledge, this is the first XGM effect-based thresholder that is operated by optical injection of a DFB laser. In this scheme, a DFB laser without an isolator is the key component, which costs less...
All optical thresholder overcomes the electronic bandwidth limitations and can enable date rate detection for high speed optical communication. In this paper, we proposed and experimentally demonstrated a novel all-optical thresholder which is flexible to adjust the power transfer function and power transmission function. To best of our knowledge, this is the first experimental demonstration of a...
A method to enhance the security of the optical stealth channel is proposed. The proposed method uses the techniques of polarization modulator based code-shift-keying (CSK) data modulation and optical code-division multiple-access (OCDMA) en/decoding, where an incoherent light source is needed. Our analysis and experimental results show that the CSK-OCDMA signal, where a wavelength selective switch...
Optical code division multiple access (OCDMA) en/decoder is the key factor affecting the performance of optical steganography transmission system. In this paper, the performance of optical steganography transmission system is investigated with different chip length of the superstructured fiber Bragg grating (SSFBG) en/decoders. The performance of the steganography system between pulse width of the...
Based on the theory of Mie and pulse wave propagation in discrete random medium, using the size distribution spectrum of fog particles, the characteristics of laser pulse propagating in fog is studied under various visibility conditions. The fog particles distribution changing with the visibility is obtained, and for larger visibility, fog particles are moving towards smaller size. These results show...
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