Optical Fiber Laser Devices for WDM Systems

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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