The propagation characteristics of several kinds of laterally tapered transitional waveguides are analyzed using the beam propagation method(BPM).
基于光束传播法，对几种只沿纵向变化的锥形过渡波导的传输特性进行了分析。
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The beam in the cavity and the output beam of the laser, if they occur in free space rather than waveguides (as in an optical fiber laser), are, at best, low order Gaussian beams.
In this paper, the theoretical design for the quantum well lasers with vertically integrated passive waveguides, which decreases the vertical beam divergence effectively, are reported.