As a continuously tunable laser with high-sweeping linearity, narrow linewidth lasers have excellent coherence properties that make them indispensable for the improvement of the spatial resolution of optical frequency domain reflection (OFDR) technology. In order to investigate the linewidth characteristics of narrow linewidth lasers with high-sweep linearity, this paper reviews the measurement and calculation methods of linewidth. The theoretical analysis of the linewidth is also carried out, and a delayed self-heterodyne measurement system based on the non-equilibrium Mach-Zehnder (M-Z) interferometer structure is built. The experimental results show that the steady-state linewidth of the laser is 178 kHz, and the fluctuation range of the dynamic linewidth is 150-200 kHz. In order to balance the speed and accuracy of linewidth measurement, the linewidth values at receiver bandwidth of 10 kHz, 30 kHz and 100 kHz are analyzed. Analyze the linewidth spreading generated by the laser during continuous frequency tuning, compensate the deviation between the real value of linewidth and the measured value by controlling the step amount of the laser wavelength tuning to keep the output power stable and reduce the measurement error caused by the linewidth spreading. This study not only improves the knowledge of linewidth characteristics, but also have important practical significance for OFDR research.
Ultra-wide spectrum light source plays an important role in large capacity fiber optic communication and fiber optic sensing. This paper designed an Er/Bi co-doped fiber, using a single-layer pumping structure on the performance of the designed fiber, which focuses on the pump power, fiber length on the performance of the output spectrum of Er/Bi codoped fiber. The experiment shows that doping formula of Erbium and Bismuth ions is beneficial to improve the intensity of L band emission line, which provides a basis for further revealing the intrinsic mechanism of Bismuth ions near infrared luminescence center. Finally, a high brightness ultra-wide spectrum light source of S+C+L band from 1450nm to 1700nm is obtained from the study of multi-parameter equalization method, in which 5dB bandwidth reached 105nm in the center of 1550nm wavelength, and the fluorescence intensity showed an upward trend after 1650nm wavelength. It can be seen that this light source will have a promising application prospect in the fields of large capacity optical fiber communication system and large capacity optical fiber sensing system.
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