1.55mm InGaAsP/InP MGL(Multi-Gain-Levered)-MQW-DFB-LD with high, red-shifted, and large bandwidth FM response

고효율, 적색편이, 광변조대역폭의 FM 응답특성을 갖는 1.55$\mu\textrm{m}$ InGaAsP/InP MGL-MQW-DFB-LD

A new nethod, namely multi-gain-levering, is proposed to improve FM response of the single frequency semiconductor lasers and applied to 1.55$\mu\textrm{m}$ InGaAsP/InP MGL(multi-gain-levered)-MQW-DFB-LD. This device consists of three sections with different bandgap energy and can be easily realized by selective MOVPE growth. Our analysis based on Green function showed that a flat, red-shifted, high FM efficiency of aove 15GHz/mA can be extected by novel gain-levering scheme.