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Frequency and Intensity Noise of Single Frequency Fiber Bragg Grating Lasers

机译：单频光纤布拉格光栅激光器的频率和强度噪声

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摘要

The relative intensity (RIN) and optical frequency (ν_rms) noise of Er-doped fiber Bragg grating lasers are investigated theoretically and experimentally. For a 1480-nm pumped fiber distributed feedback (DFB) laser with 170-μW output power we observe a typical RIN floor of --118 dBHz/sq root of Hz for fre- quencies above 10 Hz, with a strong relaxation oscillation resonance peak at 222 kHz reaching -77 dB Hz/sq root of Hz. V_rms. ranges from 26 dB Hz/sq root of Hz at 1 kHz to 2 dBHz/sq root of Hz at 1 MHz, with a sharp peak at the relaxation oscillation frequency. Below 1 kHz 1/f noise is observed in v_rms. Negative feedback to the pump laser from the fiber laser output power is found to eliminate the relaxation oscillation noise peaks both from RIN and v_rms spectra. By compar- ing measured intensity and frequency fluctuations at the relaxation oscilIation frequency, we estimate the linewidth broadening factor of two investigated lasers to be 2.1 and 3.6, as compared to typically between 3 and 7 for semi- conductor lasers.
机译：从理论和实验上研究了掺Er光纤布拉格光栅激光器的相对强度（RIN）和光频率（ν_rms）噪声。对于输出功率为170μW的1480nm抽运光纤分布反馈（DFB）激光器，对于10 Hz以上的频率，我们观察到典型的RIN本底为--118 dBHz / sq Hz根，频率高于10 Hz，并具有很强的弛豫振荡共振峰在222 kHz时达到-77 dB Hz / sq Hz根。 V_rms。范围从1 kHz时的26 dB Hz / sq Hz根到1 MHz时的2 dBHz / sq Hz根，在弛豫振荡频率处有一个尖峰。低于1 kHz，1 / v噪声以v_rms表示。发现从光纤激光器输出功率到泵浦激光器的负反馈消除了RIN和v_rms频谱中的弛豫振荡噪声峰值。通过比较在弛张振荡频率下测得的强度和频率波动，我们估计两个被研究的激光器的线宽展宽因子分别为2.1和3.6，而半导体激光器通常为3-7。

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