Experimental study about generation of picosecond pulses with dual-wavelengths and tunable pulse-widths
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摘要: 为了提高多波长光脉冲设备的实用性,采用双波长工作原理,设计了一种稳定的双波长半导体环形光纤激光器。讨论了环形腔色散、滤波器脉宽以及调制深度等对输出脉冲的影响。结果表明,双波长光脉冲的重复率为5.0GHz,典型脉宽为20ps,双波长光脉冲具有良好的边模抑制比,当输出波长为1554.75nm和1557.21nm时,边模抑制比分别为29.1dB和29.7dB,其典型的输出功率分别为-6.7dBm和-6.1dBm,输出光谱的峰值功率波动小于0.5dB。这项研究对太赫兹源和多波长光脉冲设备的研究具有借鉴意义。Abstract: In order to improve the practicability of multi-wavelength optical pulse equipment, a stable dual-wavelength semiconductor fiber ring laser was proposed and demonstrated by using dual-wavelength principle. Effects of ring cavity dispersion, filter pulse-width and modulation depth on output pulse were discussed. Experimental results are that repetition rate of dual-wavelength pulses is 5.0GHz and typical pulse-width is 20ps. Dual-wavelength pulses have good side-mode suppression ratios of 29.1dB (at 1554.75nm) and 29.7dB (at 1557.21nm) with typical output powers of -6.7dBm and -6.1dBm respectively. Output spectra are very stable with peak power fluctuation less than 0.5dB. This study is of great significance for the study of terahertz source and multi-wavelength optical pulse equipment.
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Keywords:
- lasers /
- dual-wavelength /
- actively mode-locked /
- semiconductor optical amplifier
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