Optical Fiber Laser Devices for WDM Systems

本项目旨在实现WDM系统中基于光纤激光器的各种光学器件和子系统，如脉冲或多波长光纤激光器、光纤激光传感器、光纤波长转换器和光纤布拉格光栅(FBG)。此外，还研究了用于波分复用系统的新型器件。(1)连续和脉冲光纤激光器：我们实现了自注入锁定光纤法布里-珀罗激光器(SIL-FFPL)作为稳定的连续波源，并实现了宽调谐的光纤环形激光器。我们还实现了锁模，产生了10 GHz的短脉冲。(2)多波长光纤激光器：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实现波长转换器的转换效率可提高…扩展频谱(SS)方案的NCED更多，但转换后的光的频谱也被扩展。提出并论证了一种基于泵浦光和信号光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(MPS)技术。(5)新器件：提出并实现了一种新型的基于模式耦合的保偏光纤可调滤波器。我们还提出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，并成功地实现了高达10 Gb/S信号的无误差再生。较少

This project aims at realizing various optical devices and sub-systems based on fiber lasers for WDM systems, such as pulsed or multiwavelength fiber lasers, fiber laser sensors, fiber wavelength converters, and fiber Bragg gratings (FBG's). Additionally, new devices for WDM systems are also studied.(1) CW and pulsed Fiber lasers : We realized a self-injection-locked fiber Fabry-Perot laser (SIL-FFPL) as a stable CW source, and widely tunable fiber ring lasers. We also mode-lock the FFPL to generate 10GHz short pulses.(2) Multiwavelength 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 multiwavelenglh, mode-locked fiber lasers.(3) Fiber wavelength converters : Conversion efficiency in wavelength converters utilizing four-wave mixing (FWM) in optical fibers can be enha … More nced by the spread spectrum (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) New devices : We proposed and demonstrated a novel adjustable filter using mode-coupling in a polarization maintaining fiber. We also proposed a novel waveform regenerator based on injection locking of a distributed-feedback semiconductor laser, and successfully demonstrate the error-free regeneration of up to 10Gb/s signal. Less