| 摘要 |
PURPOSE:To provide a method capable of changing a phase or a wavelength of a signal pulse of a high bit rate and an apparatus thereof. CONSTITUTION:An optical pulse having at least two wavelengths is generated from a Fabry-Perot type semiconductor laser 11, and ultrashort, light is pulsed through a dispersion shift fiber 12, an optical fiber amplifier 13, a band-pass filter 14 and an anomalous dispersion fiber 15, and the obtained ultrashort light pulsed raw is emitted into a traveling wave type semiconductor laser 16 as excitation light together with signal light 18. Therefore, a decrease in carrier due to an induction amplification of the long wavelength side is replenished with an induction absorption of the short wavelength side, and a carrier density in an active layer is rapidly returned to a steady state, and a phase or a wavelength corresponding to a signal light pulse of a high bit rate can be converted. |
