| 摘要 |
PURPOSE:To simply combine many excitation lights without combination of polarized waves by using a plurality if excitation light sources having different oscillation wavelengths. CONSTITUTION:An incident signal light is combined with an excitation light having 1.48mum wavelength emitted from a semiconductor laser 31 by an optical fiber coupler 21. The combination light is further combined with an excitation light having 0.98mum wavelength emitted from a semiconductor laser 32 by an optical fiber coupler 22, and incident on an Er-added optical fiber 11. An amplification gain of 35dB and a saturated output of +4dBm are obtained by a semiconductor laser 20mW having 1.48mum wavelength and a semiconductor laser 10mW having 0.98mum wavelength. If the source has only the laser having 1.48mum of wavelength, a gain of 20dB and a saturated output of -3dBm are obtained by 15mW of excitation power. If the source has only the laser having 0.98mum of wavelength, a gain of 20dB and a saturated output of -3dBm are obtained by 10mW of excitation power. Accordingly, the amplification gain and the saturated output can be increased. |
