对通常所采用的描述两段式双稳半导体激光器的速率方程组作了适当的修正，并根据物理事实引入一个方程限定波长.从而使速率方程组可以用来讨论器件输出波长的变化.数值模拟的结果不但符合前人实验观察到的当器件输出功率上跳时输出波长向长波长方向发生跳跃这个现象，而且还预计在下跳时输出波长将向短波端发生跳跃.

Based on the physics fact, an extra equation has been introduced to specify the wavelength of the two-segment abeorptive bistable semiconductor lasers(TABLs). With appropriate modifications, conventional rate equations have been used to study the wavelength characteristics of the TABL. Calculations lead to a wavelength loop accompanying the hysteresis process, indicating a wavelength jump towards the longer wavelength at "switch-on" (sudden increase of output power) and a reverse process at "switch-off" (sudden decrease of output power) as shown in Fig.1 and Fig.2.