| 摘要 |
<p>A VC-VSTEP has a pnpn structure, and comprises first and second mirror structures (42, 48), and an intermediate structure (57) provided between the first and second mirror structures. The intermediate structure (57) comprises an active and light absorption layer (45) of multi-quantum well layers, and is set to have a thickness which is n times of an oscillation wavelength in a medium, where n is an integer. <IMAGE></p> |
