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81.
82.
设计了一种没有隔离器的单壁碳纳米管双向被动锁模光纤孤子激光器.该光纤激光器由波分复用器、掺铒光纤、光耦合器、碳纳米管、单模光纤和偏振控制器组成.在环形腔的两个相反方向上,同时实现基于碳纳米管饱和吸收体的被动锁模,得到两个反向稳定脉冲序列.调节激光腔中的偏振控制器以及泵浦激光源,分析该实验装置在不同泵浦功率下的输出特性.结果表明,中心波长变化范围为1 558~1 560nm,顺时针脉冲宽度变化范围为854~959ps,逆时针脉冲宽度变化范围为247~624ps.此外,泵浦功率较大时,逆时针方向上脉冲序列分裂. 相似文献
83.
Erbium-doped fiber lasers are normally actively mode-locked through amplitude modulation or phase modulation. In this paper, we demonstrate that the laser can also be mode-locked by employing polarization modulation with a polarization-dependent cavity loss. We obtain a nearly transform-limited mode-locked pulse train at 10 GHz repetition rate with timing jitter as low as 164 fs. The timing jitter is only limited by the timing jitter of the driving signal. 相似文献
84.
Fiber optical parametric oscillator based on photonic crystal fiber pumped with all-normal-dispersion mode-locked Yb:fiber laser
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We demonstrate a cost effective, linearly tunable fiber optical parametric oscillator based on a home-made photonic crystal fiber pumped with a mode-locked ytterbium-doped fiber laser, providing linely tuning ranges from 1018 nm to 1038 nm for the idler wavelength and from 1097 nm to 1117 nm for the signal wavelength by tuning the pump wavelength and the cavity length. In order to obtain the desired fiber with a zero dispersion wavelength around 1060 rim, eight sam- ples of photonic crystal fibers with gradually changed structural parameters are fabricated for the reason that it is difficult to accurately customize the structural dimensions during fabrication. We verify the usability of the fabricated fiber experimen- tally via optical parametric generation and conclude a successful procedure of design, fabirication, and verification. A seed source of home-made all-normal-dispersion mode-locked ytterbium-doped fiber laser with 38.57 ps pulsewidth around the 1064 nm wavelength is used to pump the fiber optical parametric oscillator. The wide picosecond pulse pump laser enables a larger walk-off tolerance between the pump light and the oscillating light as well as a longer photonic crystal fiber of 20 m superior to the femtosecond pulse lasers, resulting in a larger parametric amplification and a lower threshold pump power of 15.8 dBm of the fiber optical parametric oscillator. 相似文献
85.
Noise characteristics of mode-locked hybrid soliton pulse source (HSPS) where fiber Bragg grating is used as external cavity
is presented. Model is based on time-domain solution of coupled-mode equations including spontaneous noise. Relative intensity
noise (RIN) is calculated by using numerical solution of these equations. It is shown that inclusion of carrier density noise
in the rate equations is necessary for the accurate analysis of noise in mode-locked lasers. It is also found that transform-limited
pulses are not generated over a wide tuning range around the fundamental mode-locking frequency with spontaneous and carrier
density noise sources if noise level is high. Therefore mode-locking range where transform limited pulses are obtained reduces. 相似文献
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The comb-like filter characteristic of a Fabry-Perot etalon in frequency domain was deployed to filter out the discrete spectral lines of injected 10GHz optical pulse train. By changing the free spectral range and obtaining the spectral components spaced to 4 and 6 times of the repetition rate, the pulse trains with 40 GHz and 60 GHz were successfully obtained. 相似文献
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