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A tunable self-mixing chaotic laser based on high frequency electro-optic modulation
摘要： A tunable self-mixing chaotic laser based on high frequency electro-optical modulation is proposed. A laser dynamics system is designed and tested for tunable chaotic laser generation and provides optical feedback and electro-optic modulation with two degrees of freedom. The chaotic laser is generated by optical feedback, and it becomes tunable by high frequency electro-optic modulation. The frequency is modulated from 10 MHz to 10 GHz to test this system, and an ultra-wide band chaotic laser from 0.8 GHz to 24 GHz is measured by an electrical spectrum analyzer (ESA). The experimental results show the generation of a tunable chaotic laser via electro-optic modulation. At the same time, this tunable chaotic laser has a highly sensitive dynamic response near the 2.0 GHz range of frequency modulation. The system is proved to be suitable for applications in high-speed broadband communication and sensing.
关键词： Optical injection,Laser self-mixing,Electro-optic modulation,Chaotic laser
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) - Auckland, New Zealand (2019.5.20-2019.5.23)] 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) - High-Spatial Resolution Demodulation of Weak FBGs Based on Incoherent Optical Frequency Domain Reflectometry Using a Chaotic laser
摘要： A high-spatial resolution demodulation technique based on incoherent optical frequency domain reflectometry is proposed for distributed weak fiber Bragg grating (FBG) sensing. A single longitudinal mode, narrow linewidth light output from Distributed Feedback Laser (DFB) is modulated with a frequency swept microwave, then enter the FBGs and reflected. The reflected optical signal is transformed into electric signal by a photodiode, and then mixes with the original microwave to produce the beat frequency. We can use Fast Fourier transformation to analyze the beat frequency to modulate the location information, next control the wavelength of DFB laser to sweep in a specific range and finally obtain the wavelength information of FBGs. In order to eliminate the influence of interference between light reflected from the FBGs, chaotic signals from DFB laser with optical feedback are generated to broaden the linewidth of laser. Therefore, the spatial resolution of FBGs can be greatly improved to 10cm. and we have demonstrated the long distance demodulation nearly 500m and 10cm interval with the achieved accuracy to be 16 pm.
关键词： high-spatial resolution,chaotic laser,narrow linewidth,Incoherent Optical Frequency Domain Reflection
更新于2025-09-12 10:27:22
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Investigation of the dynamical behaviour of a high-power laser diode subject to stimulated Brillouin scattering optical feedback
摘要： In this work, we propose a new scheme of optical feedback using stimulated Brillouin scattering (SBS). A high-power laser diode emitting at 1450 nm stimulates Brillouin back-scattering in a 4km-long optical fibre and the back-scattered light is injected back into the laser diode for optical feedback. The experimental results with RF spectrum exhibit clearly the Brillouin frequency shift at 11.46 GHz. Although the frequency shift is very large, the laser diode subject to optical feedback using SBS shows abundant dynamics. RF spectrum maps are also established with respect to the laser drive current. The results are compared with the ones for conventional optical feedback and it is clearly shown that the dynamical behaviours for both the con?gurations are very different. The investigation with autocorrelation functions reveals that the time-delay signature vanishes completely using the SBS feedback scheme unlike the conventional feedback one.
关键词： stimulated Brillouin scattering,optical feedback,chaotic laser
更新于2025-09-11 14:15:04