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摘要
本文报道了一种2 μm波段可调谐主动锁模光纤激光器，增益介质为4 m铥钬共掺光纤。主动锁模脉冲采用强度调制方式实现，调制信号为高频正弦信号。可调谐窄带宽光滤波器用来窄化激光线宽，抑制噪声，同时可实现波长调谐。实现了稳定的2.2 GHz重复频率主动锁模脉冲输出，对应649阶谐波锁模脉冲序列，脉冲宽度约为200 ps，频谱信噪比可达68 dB，激光线宽为0.05 nm，光谱调谐范围为1907 nm~1927 nm。
Abstract
We demonstrate a tunable actively mode-locked fiber laser at 2 μm band. A segment of 4 m Tm-Ho-co-doped fiber is used as gain medium. Active mode locking pulse is realized by using intensity modulation and the signal source is high frequency sinusoidal signal. A tunable narrow bandwidth optical filter is used to narrow laser linewidth, suppress noise and achieve wavelength tuning. Stable actively mode-locked pulses with up to 2.2 GHz repetition rate is obtained, corresponding to 649 order harmonic mode-locked pulse train. The pulse width is about 200 ps. The signal-to-noise ratio of RF spectrum is 68 dB. The optical tuning range is 1907 nm~1927 nm.
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Key words:
- fiber laser /
- actively mode-locked /
- Tm-Ho-co-doped fiber /
- high repetition rate /
- tunable laser
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Overview
Overview: Recently the research on 2 μm mode-locked fiber laser has made rapid progress. However, comparing with 1.55 μm and 1 μm mode-locked fiber laser, 2 μm mode-locked fiber laser is seriously wanting on the parameters of repetition rate, pulse width and tuning range. This problem is limited by the large dispersion of silica fibers at 2 μm and the difficulty of the corresponding fabrication of fiber devices. The advantage of active mode locked fiber laser is that it can realize high repetition frequency, high frequency and waveform controlling. Therefore, it has important application value in large capacity high speed optical communication, broadband signal processing, high-speed optical frequency comb generation and other fields. At present, the research on actively mode-locked fiber laser is mainly focused on 1.55 μm and 1 μm bands. There are fewer reports on the 2 μm actively mode-locked fiber laser. In 2013, Wang Xiong et al. reported an all-fiber actively mode-locked thulium-doped laser. It realizes mode-locked pulses with 11.884 MHz and 12.099 MHz repetition rate. In 2015, C. Kneis et al. reported a wavelength tunable, high average output power actively mode-locked thulium-doped fiber laser. In 2016, Y. Wang reported a pump modulation actively mode-locked thulium-doped fiber laser. It can be seen from the reported research, it is still difficult to realize the 2 μm actively mode-locked pulses in an all-fiber cavity with GHz magnitude repetition rate。
We demonstrate a tunable actively mode-locked fiber laser at 2 μm band. A segment of 4 m Tm-Ho-co-doped fiber is used as gain medium. Active mode locking pulse is realized by using intensity modulation and the signal source is high frequency sinusoidal signal. A tunable narrow bandwidth optical filter is used to narrow laser linewidth, suppress noise and achieve wavelength tuning. Stable actively mode-locked pulses with up to 2.2 GHz repetition rate is obtained, corresponding to 649 order harmonic mode-locked pulse train. The pulse width is about 200 ps. The signal-to-noise ratio of RF spectrum is 68 dB. The optical tuning range is 1907 nm~1927 nm. This fiber laser has the great value in applications such as high speed optical communication, optical frequency comb and mid-infrared source generation.
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图 1 2 μm主动锁模铥钬共掺光纤激光器结构图
Figure 1. Schematic of 2 μm actively mode-locked THDF fiber laser
图 3 主动锁模激光脉冲序列。(a)重复频率20.35 MHz；(b)重复频率251.165 MHz；(c)重复频率2200 MHz
Figure 3. Actively mode-locked pulse train. (a) 20.35 MHz repetition rate; (b) 251.165 MHz repetition rate; (c) 2200 MHz repetition
图 4 主动锁模激光频谱。(a)重复频率20.35 MHz；(b)重复频率251.165 MHz；(c)重复频率2200 MHz
Figure 4. RF spectrum of actively mode-locked laser. (a) 20.35 MHz repetition rate; (b) 251.165 MHz repetition rate; (c) 2200 MHz repetition rate
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参考文献
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