optical gap width 禁带宽度
optical beam width 光束束宽
optical pulse width 光脉冲宽度
width of optical spectrum 光谱宽度
Dispersion is the primary affects of the optical fiber band width.
色散问题是影响光纤带宽的主要因素。
Nowadays, the optical pulse used in the OTDM system is often generated by the gain-switched distributed-feedback (GS-DFB) semiconductor laser, which has a large pulse width and negative chirp.
目前常采用GS-DFB半导体激光器作为OTDM系统的光脉冲源，这种脉冲源产生的光脉冲一般较宽。
Methods By the matrix optical method, formulae of waist width and imaging distance of focused Gaussian beams through the coupling system are derived.
方法利用矩阵光学方法，推导了高斯光束经耦合系统聚焦后束腰宽度和像距的计算公式。
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