We present an ultrabroadband, high-speed wavelength-swept source based on a self-modulated femtosecond oscillator. Photonic crystal fiber was pumped by a mode-locked Yb:CaF2 laser, resulting in a strong spectral broad...We present an ultrabroadband, high-speed wavelength-swept source based on a self-modulated femtosecond oscillator. Photonic crystal fiber was pumped by a mode-locked Yb:CaF2 laser, resulting in a strong spectral broadening from 485 to 1800 nm. The pump laser cavity could be realigned in order to achieve total mode-locking of the longitudinal and transverse TEM00 and TEM01 electromagnetic modes. This led to spatial oscillations of the output beam, which induced modulation of the coupling efficiency to the fiber. Due to the fact that nonlinear spectral broadening was intensity dependent, this mechanism introduced wavelength sweeping at the fiber output. The sweeping rate could be adjusted between 7 and 21.5 MHz by changing the geometry of the pump cavity. By controlling the ratio of the transverse mode amplitudes, we were able to tune the sweeping bandwidth, eventually covering both the 1300 nm and 1700 nm bioimaging transparency windows. When compared with previously demonstrated wavelength-swept sources, our concept offers much broader tunability and higher speed. Moreover,it does not require an additional intensity modulator.展开更多
A wavelength-swept fiber laser is proposed and successfully demonstrated based on a bidirectional used linear chirped fiber Bragg grating(LC-FBG). The wavelength-swept operation principle is based on intracavity pulse...A wavelength-swept fiber laser is proposed and successfully demonstrated based on a bidirectional used linear chirped fiber Bragg grating(LC-FBG). The wavelength-swept operation principle is based on intracavity pulse stretching and compression. The LC-FBG can introduce equivalent positive and negative dispersion simultaneously, which enables a perfect dispersion matching to obtain wide-bandwidth mode-locking. Experimental results demonstrate a wavelength-swept fiber laser that exhibits a sweep rate of about 5.4 MHz over a 2.1 nm range at a center wavelength of 1550 nm. It has the advantages of simple configuration and perfect dispersion matching in the laser cavity.展开更多
A wavelength-swept laser is constructed using a free space external cavity configuration coupled with a fiber- based ring cavity at the 850 nm region. The external cavity filter employs a galvo-mirror scanner with a d...A wavelength-swept laser is constructed using a free space external cavity configuration coupled with a fiber- based ring cavity at the 850 nm region. The external cavity filter employs a galvo-mirror scanner with a diffraction grating for wavelength selection. The filter is connected to a ring cavity through an optical circulator. The ring cavity contains a broadband semiconductor optical amplifier with a high optical output. The perfor- mance of this laser is demonstrated with broad bandwidths and narrow linewidths. The 3 dB linewidth and the bandwidth of this source are 0.05 nm （-20 GHz） and 48 nm, respectively. The maximum output power is 26 mW at 160 mA current.展开更多
We propose and demonstrate a novel single-longitudinal-mode(SLM) erbium-doped fiber laser(EDFL) capable of operating at fixed-wavelength lasing mode with a tunable range more than 54 nm, an ultra-narrow linewidth of 4...We propose and demonstrate a novel single-longitudinal-mode(SLM) erbium-doped fiber laser(EDFL) capable of operating at fixed-wavelength lasing mode with a tunable range more than 54 nm, an ultra-narrow linewidth of 473 Hz and an ultra-high optical signal-to-noise ratio(OSNR) more than 72 dB, or operating at wavelength-swept mode with tunable sweep rate of 10—200 Hz and a sweep range more than 50 nm. The excellent features mainly benefit from a triple-ring subring cavity constructed by three optical couplers nested one another and a fiber Fabry-Pérot tunable filter which can be driven by a constant voltage or a periodic sweep voltage for fixed or wavelength-swept operation, respectively. The proposed EDFL has potential applications in high-resolution spectroscopy and fiber optic sensing.展开更多
波长快速扫描系统在算力网络、5G前传网络以及新一代可重构光分插复用系统等领域起着重要作用,整个波长扫描测试系统的性能基本取决于激光器性能的优劣。为此,基于In Ga As P/In P增益芯片优异的宽光谱光学特性和Littman-Metcalf外腔反...波长快速扫描系统在算力网络、5G前传网络以及新一代可重构光分插复用系统等领域起着重要作用,整个波长扫描测试系统的性能基本取决于激光器性能的优劣。为此,基于In Ga As P/In P增益芯片优异的宽光谱光学特性和Littman-Metcalf外腔反馈原理研制了一台具备宽调谐范围、高扫描速度以及无模式跳变等特点的可调谐激光器。实验上获得了240 nm/s的最高扫描速度、0.001 nm的最小步进触发间隔、优于±1.3 pm/1 min的波长稳定性、优于2.39 pm的绝对波长精度、优于±0.02 d B/1 min的功率稳定性及无跳模范围为110 nm的单纵模扫频输出。该研究有助于推动波长快速扫描测试系统的研究进程,提升波分复用等器件的测试精度和效率。展开更多
基金Narodowe Centrum Nauki(NCN)(2015/18/E/ST7/00296)Narodowe Centrum Badani Rozwoju(NCBR)(POIR.04.01.01-00-0037/17)+1 种基金Politechnika Wroclawska(PWr)(0402/0121/17)Fundacja na rzecz Nauki Polskiej(FNP)
文摘We present an ultrabroadband, high-speed wavelength-swept source based on a self-modulated femtosecond oscillator. Photonic crystal fiber was pumped by a mode-locked Yb:CaF2 laser, resulting in a strong spectral broadening from 485 to 1800 nm. The pump laser cavity could be realigned in order to achieve total mode-locking of the longitudinal and transverse TEM00 and TEM01 electromagnetic modes. This led to spatial oscillations of the output beam, which induced modulation of the coupling efficiency to the fiber. Due to the fact that nonlinear spectral broadening was intensity dependent, this mechanism introduced wavelength sweeping at the fiber output. The sweeping rate could be adjusted between 7 and 21.5 MHz by changing the geometry of the pump cavity. By controlling the ratio of the transverse mode amplitudes, we were able to tune the sweeping bandwidth, eventually covering both the 1300 nm and 1700 nm bioimaging transparency windows. When compared with previously demonstrated wavelength-swept sources, our concept offers much broader tunability and higher speed. Moreover,it does not require an additional intensity modulator.
基金National Natural Science Foundation of China(NSFC)(61475065)Natural Science Foundation of Guangdong Province(2015A030313322)
文摘A wavelength-swept fiber laser is proposed and successfully demonstrated based on a bidirectional used linear chirped fiber Bragg grating(LC-FBG). The wavelength-swept operation principle is based on intracavity pulse stretching and compression. The LC-FBG can introduce equivalent positive and negative dispersion simultaneously, which enables a perfect dispersion matching to obtain wide-bandwidth mode-locking. Experimental results demonstrate a wavelength-swept fiber laser that exhibits a sweep rate of about 5.4 MHz over a 2.1 nm range at a center wavelength of 1550 nm. It has the advantages of simple configuration and perfect dispersion matching in the laser cavity.
基金supported by Kyungpook National University Research Fund,2012
文摘A wavelength-swept laser is constructed using a free space external cavity configuration coupled with a fiber- based ring cavity at the 850 nm region. The external cavity filter employs a galvo-mirror scanner with a diffraction grating for wavelength selection. The filter is connected to a ring cavity through an optical circulator. The ring cavity contains a broadband semiconductor optical amplifier with a high optical output. The perfor- mance of this laser is demonstrated with broad bandwidths and narrow linewidths. The 3 dB linewidth and the bandwidth of this source are 0.05 nm （-20 GHz） and 48 nm, respectively. The maximum output power is 26 mW at 160 mA current.
基金supported by the Natural Science Foundation of Hebei Province(No.F2016201023)the Technology Foundation for Selected Overseas Chinese Scholar of Ministry of Human Resources and Social Security of China(No.CG2015003006)the Advanced Talents Program of Hebei Educational Committee(No.GCC2014020)
文摘We propose and demonstrate a novel single-longitudinal-mode(SLM) erbium-doped fiber laser(EDFL) capable of operating at fixed-wavelength lasing mode with a tunable range more than 54 nm, an ultra-narrow linewidth of 473 Hz and an ultra-high optical signal-to-noise ratio(OSNR) more than 72 dB, or operating at wavelength-swept mode with tunable sweep rate of 10—200 Hz and a sweep range more than 50 nm. The excellent features mainly benefit from a triple-ring subring cavity constructed by three optical couplers nested one another and a fiber Fabry-Pérot tunable filter which can be driven by a constant voltage or a periodic sweep voltage for fixed or wavelength-swept operation, respectively. The proposed EDFL has potential applications in high-resolution spectroscopy and fiber optic sensing.
文摘波长快速扫描系统在算力网络、5G前传网络以及新一代可重构光分插复用系统等领域起着重要作用,整个波长扫描测试系统的性能基本取决于激光器性能的优劣。为此,基于In Ga As P/In P增益芯片优异的宽光谱光学特性和Littman-Metcalf外腔反馈原理研制了一台具备宽调谐范围、高扫描速度以及无模式跳变等特点的可调谐激光器。实验上获得了240 nm/s的最高扫描速度、0.001 nm的最小步进触发间隔、优于±1.3 pm/1 min的波长稳定性、优于2.39 pm的绝对波长精度、优于±0.02 d B/1 min的功率稳定性及无跳模范围为110 nm的单纵模扫频输出。该研究有助于推动波长快速扫描测试系统的研究进程,提升波分复用等器件的测试精度和效率。
