As a low-cost and high-performance specific wavelength light source used for fiber-optic communication systems

the Vertical Cavity Surface Emitting Laser（VCSEL） is simple to test and easy to couple and form arrays.It has been applied in large scales in optical parallel interconnection and high-density light storage.This paper introduces its structure and the current level of its fabricating technology and explains its present development and applications in various wavebands

discusses the scopes of its applications in different fields and points out the prospects of its development.