激光器对光电振荡器相位噪声的影响

为了改善光电振荡器相位噪声特性、提高光电振荡器性能,采用理论分析和实验验证的方法,研究了激光器线宽、光功率与光电振荡器相位噪声之间的关系.测试了激光器在功率相等、线宽不等情况下,光电振荡器所产生的微波信号的频谱特性和相位噪声特性;测试了给定线宽激光器在不等功率情况下,所产生的微波信号的相位噪声特性.结果表明,激光器线宽越窄、光功率越大,光电振荡器产生微波信号的频谱特性和相位噪声特性就越好;在频偏1kHz以外,相位噪声受激光器线宽影响较小,受光功率影响较大.这一结果对改善光电振荡器相位噪声有一定的帮助.

Influence of lasers on phase noise of optoelectronic oscillators

In order to optimize the phase noise characteristics and improve the performance of an optoelectronic oscillator (OEO), the relation among the phase noise of an OEO, the spectra line-width and optical power was studied by theoretical analysis and experimental verification. The spectral performance and phase noise of microwave signals generated by the OEO were measured respectively, under the conditions of equal optical power and different spectra line-widths. And then, phase noise of microwave signals was measured under the conditions of fixed spectral line-width and different laser power. The results indicate that the narrower spectral line-width and the higher laser power, the better phase noise and spectral characteristics of microwave signals. Furthermore, compared with the spectral line-width, the laser power has greater effect on phase noise beyond 1kHz frequency offset. The result is helpful for improving phase noise of photoelectric oscillator.