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线性扫频激光源在高分辨率、高精度、大动态范围的激光测量和光纤传感领域有着广泛的应用。然而,扫频非线性及激光相位噪声限制了测量系统的分辨率、精度和动态范围。分析了分布反馈式(DFB)半导体激光扫频中的非线性及激光相位噪声产生的机制,提出基于预畸变和光锁相的激光扫频非线性校正和激光相位噪声抑制方法,实现了扫频范围为50 GHz,均方根频率误差小于263 k Hz的激光扫频信号。实验测试表明该扫频激光源的线性度和相干性得到了有效增强。
Linear sweep laser source in the high-resolution, high precision, large dynamic range of laser measurement and optical fiber sensing has a wide range of applications. However, swept-frequency non-linearity and laser phase noise limit the resolution, accuracy and dynamic range of the measurement system. The mechanism of non-linear and laser phase noise generation in distributed feedback (DFB) semiconductor laser scanning is analyzed. A laser sweep nonlinearity correction and laser phase noise suppression method based on pre-distortion and light-phase-locking are proposed. At 50 GHz, a laser sweep with a rms frequency error of less than 263 k Hz. Experimental tests show that the linearity and coherence of the swept-frequency laser source are effectively enhanced.