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通过理论分析、实验和计算机模拟得到：进行直接强度调制时，体块型DFB激光器的总微分量子效率（与多量子阱DFB激光器相比）过低，从而导致其绝热啁啾占激光器啁啾的主要部分；用于无再生中继距离较大的强度调制／直接检测（IM／DD）光纤通信系统时，色散效应将导致信号脉冲上升沿压缩，使系统误码率增加。据此建议：在无再生中继距离大于100～120km的常规单模光纤IM／DD系统中，应采用多量子阱激光器。
Through theoretical analysis, experiment and computer simulation, the total differential quantum efficiency (compared with multi-quantum well DFB lasers) of bulk DFB lasers is too low for direct intensity modulation, resulting in its adiabatic chirp accounting for laser chirp When used in an IM / DD optical fiber communication system without regenerative relay distance, the dispersion effect will cause the rising edge of the signal pulse to be compressed and the system bit error rate will increase. Based on this suggestion, multi-quantum well lasers should be used in conventional single-mode optical fiber IM / DD systems without regenerative relay distance more than 100 ~ 120km.