Wideband Optical Fiber Amplifiers and Lasers for WDM Systems

宽带光器件，特别是宽带光纤放大器和激光器，是WDM光纤系统的关键。本计画的目标是实现宽频光纤元件，如光纤放大器、光纤雷射、光纤波长转换器、光纤布喇格光栅。此外，还研究了利用半导体激光器的波形再生器。(1)光纤放大器：我们提出了一种新颖的L波段光纤放大器，结合了一个小型的C波段FBG激光器，并证明了他们的宽带。(2)光纤激光器：我们实现了波长间隔可调谐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、可重构光学滤波器的实现以及光纤光栅激光传感系统。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）的波长转换器中的转换效率可以通过扩展频谱来提高。 关于我们 m（SS）方案，但转换光的光谱也会展宽。我们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。我们可以实现非常宽的转换带宽（60 nm）和非常高的效率（-0.3dB）。在10 Gb/s的传输实验中，我们证明了它的高性能。(4)FBG：FBG具有尖锐的带反射特性，因此对于WDM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。提出了一种实现密集超结构光纤光栅（SSFBG）的新技术--多重相移（MPS）技术。(5)波形再生器：提出并实现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。我们指出，边模注入锁定技术更容易实现光滤波，并能抑制弛豫振荡。我们成功地证明了高达10 Gb/s的信号的无差错再生。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