REDUCED INTERMODULATION DISTORTION IN 1300-NM GAIN-CLAMPED MQW LASER-AMPLIFIERS

A 1300 nm gain-clamped DFB multiple quantum well laser amplifier with negligible pass-band ripple, 20 dB fiber to fiber gain, and 10 dB redu ction in gain saturation is demonstrated, The remaining gain saturatio n is attributed to longitudinal hole burning, After some modifications the; reduction in gain saturation is improved to more than 30 dB for an input sig?al having the same polarization state as the lasing mode, From these experiments and a theoretical analysis it is concluded tha t there is a potential for realizing highly linear 1300 nm CATV semico nductor laser amplifiers using gain-clamping with less intermodulation distortion than today's directly modulated linear semiconductor laser s.