Wideband Optical Fiber Amplifiers and Lasers for WDM Systems

宽带光学器件，特别是宽带光纤放大器和激光器是WDM光纤系统的关键。该项目旨在实现宽带光纤器件，如光纤放大器、光纤激光器、光纤波长转换器和光纤布拉格光栅(FBG)。此外，还对基于半导体激光器的波形再生器进行了研究。(1)光纤放大器：我们提出了一种新型的L波段光纤放大器，并结合MIME C波段FBG激光器，实现了宽带输出。(2)光纤激光器：实现了波长间距可调的多波长光纤激光器。并将该技术应用于光纤色散测量、分布式压力传感、可重构滤光片的实现以及FBG激光传感系统。实现了多波长锁模光纤激光器。(3)光纤波长转换器：利用光纤中的四波混频(FWM)可以通过扩展光谱…提高波长转换器的转换效率更多的m(SS)方案，但转换光的光谱也是展宽的。我们提出并证明了一种基于泵浦光和信号光的同步相位或频率调制的新型高效波长转换技术。我们可以获得很宽(60 Nm)的转换带宽和很高的转换效率(-0.3dB)。在10 Gb/S传输实验中，我们验证了其高性能。(4)FBG：FBG具有尖锐的频带反射特性，因此对于波分复用系统是必不可少的。我们研究了新型结构的FBG，以及新型的制作技术。提出了一种用于密集波分复用系统中实现密集超结构FBG(SSFBG)的新颖实用技术--多相移技术。(5)波形再生器：提出并论证了一种基于分布反馈半导体激光器注入锁定的新型波形再生器。结果表明，采用侧模注入锁定技术是因为光学滤波更容易，并且可以抑制弛豫振荡。我们成功地实现了高达10 Gb/S信号的无误差再生。较少

Wideband optical devices, especially wideband optical fiber amplifiers and lasers are crucial for WDM optical fiber systems. This project aims at realizing wideband optical fiber devices, such as fiber amplifiers, fiber lasers, fiber wavelength converters, and fiber Bragg gratings (FBG's). Additionally, wave form regenerators using semiconductor lasers are also studied.(1) Fiber amplifiers : We proposed novel L-band fiber amplifiers incorporating an mime C-band FBG laser, and demonstrated their wide bandwidth.(2) Fiber lasers : We realized wavelength-spacing-tunable multiwavelength fiber lasers. And we applied this technique to fiber dispersion measurement, distributed pressure sensing, realization of reconfigurable optical filters, and FBG laser sensor systems. We also realized multiwavelength, mode-locked fiber lasers.(3) Fiber wavelength converters: Conversion efficiency in wavelength converters utilizing four-wave mixing (FWM) in optical fibers can be enhanced by the spread spectru … More m (SS) scheme, but the spectrum of the converted light is also spread We proposed and demonstrated a novel highly-efficient wavelength conversion technique based on synchronous phase or frequency modulations of both pump and signal lights. We could achieve the very wide (60nm) conversion bandwidth and very high efficiency (-0.3dB). We demonstrated its high performance in a 10Gb/s transmission experiment.(4) FBG's : The FBG has sharp band-reflection characteristics, therefore essential for WDM systems. We investigated novel structured FBG's, and novel fabrication techniques. We proposed a novel and useful technique to realize dense superstructured-FBG (SSFBG) for DWDM systems, multiple phase shift (MPS) technique.(5) Waveform regenerators : We proposed and demonstrated a novel wave form regenerator based on injection locking of a distributed-feedback semiconductor laser. We showed that the side-mode injection locking techinique should be used because the optical filtering is easier and the relaxation oscillation can be suppressed. We successfully demonstrate the error-free regeneration of up to 10Gb/s signal. Less