Novel lightsources with variable frequency, waveform, and number of channels for communications and sensings.

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The purpose of the project is to develop lightsources with controllabilities of their frequencies, waveforms, and number of channels. The achievements of this project are as follows.With the use of semiconductor-amplifier based waveform/wavelength converter, a 16-channel multi-wavelength light-source with variable pulsewidth between 10ps and 90ps were demonstrated. The generated optical signals were successfully applied to transmission over fibers with various dispersion values between - 100ps/nm and 460ps/nm so that the power penalties of received signals were minimized by adjusting the pulsewidths. Pulsewidth optimized signal was also found to be superior to conventionally used optical signal formats.A multi-wavelength fiber laser with an intra-cavity phase modulation was demonstrated. Multi-wavelength output with a good spectral flatness within 5nm was successfully demonstrated.Wavelength conversion with a semiconductor optical amplifier was applied to realize a variable wavelength optical clock in the wavelength range between 1460nm and 1610nm. 10GHz clock signal was successfully obtained with a very high optical signal to noise ratio.Narrow-linewidth single-polarization single-frequency fiber laser controlled by an external light injection was demonstrated. With a proper adjustment of lasing and external light powers, low-drift wavelength tunable operation between 1545nm and 1560nm was achieved.Improvement of multi-wavelength lightsource based on supercontinuum spectrum generation through Raman soliton effect in optical fiber was investigated with the use of seed pulses with shorter pulsewidth. With the use of 1.3ps pulsewidth seed light source, larger bandwidth and better flatness of the generated spectrum was obtained. Detailed characterization of the generated spectrum is still in progress.