Title :
Semiconductor Raman amplifier for terahertz bandwidth optical communication
Author :
Suto, Ken ; Saito, Takao ; Kimura, Tomoyuki ; Nishizawa, Jun-ichi ; Tanabe, Tadao
Author_Institution :
Dept. of Mater. Sci., Tohoku Univ., Sendai, Japan
fDate :
4/1/2002 12:00:00 AM
Abstract :
Semiconductor Raman amplifiers are useful for frequency selection in terahertz bandwidth and wavelength division multiplexing (WDM) systems with terabit capacity, as well as direct terabit optical communication systems. We have developed GaP-AlGaP Raman waveguides with micrometer-size cross sections. We have reduced residual optical loss of the waveguide by improvement of the fabrication process and realized a low-loss waveguide that is 10-mm long, which has a continuous wave (CW) Raman gain of 3.7 dB. Also, the time-gated amplification with 80-ps pulse pumping is performed and 20-dB gain is obtained. These performances are very suitable for light frequency selection in terahertz bandwidth and WDM optical communication systems
Keywords :
III-V semiconductors; Raman lasers; aluminium compounds; gallium compounds; high-speed optical techniques; optical losses; optical pumping; optical transmitters; optical waveguides; semiconductor optical amplifiers; submillimetre wave lasers; waveguide lasers; wavelength division multiplexing; 10 mm; 20 dB; 3.7 dB; 80 ps; GaP-AlGaP; GaP-AlGaP Raman waveguides; THz bandwidth optical communication; WDM optical communication systems; WDM systems; continuous wave Raman gain; direct terabit optical communication systems; fabrication process; frequency selection; light frequency selection; low-loss waveguide; micrometer-size cross sections; pulse pumping; residual optical loss; semiconductor Raman amplifier; terahertz bandwidth; terahertz bandwidth optical communication; time-gated amplification; wavelength division multiplexing systems; Bandwidth; Optical fiber communication; Optical frequency conversion; Optical pumping; Optical waveguides; Semiconductor optical amplifiers; Semiconductor waveguides; Stimulated emission; Waveguide discontinuities; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
