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，还对WDM系统的新器件进行了研究。(1)连续波和脉冲光纤激光器：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，以及可广泛调谐的光纤环形激光器。我们还对FFPL进行了模式锁定，以产生10GHz短脉冲。(2)多波长光纤激光器：实现了波长间隔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光纤光栅激光传感器系统。我们还实现了多波长、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）可以提高波长转换器的转换效率，更需要扩频（SS）方案，但转换后的光的光谱也会扩频。我们提出并演示了一种基于泵浦和信号灯同步相位或频率调制的新型高效波长转换技术。我们可以实现非常宽（60nm）的转换带宽和非常高的效率（-0.3dB）。我们在10Gb/s传输实验中展示了它的高性能。(4)光纤光栅：光纤光栅具有明显的带反射特性，因此对波分复用系统至关重要。我们研究了新型结构的光纤光栅和新的制造技术。提出了一种实现DWDM系统中密集上层结构光纤光栅（SSFBG）的新技术——多相移（MPS）技术。(5)新器件：我们提出并演示了一种新型的可调滤波器，该滤波器在保偏光纤中使用模式耦合。我们还提出了一种基于注入锁定的分布式反馈半导体激光器波形再生器，并成功实现了高达10Gb/s的信号无差错再生。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