VCSEL (Vertical Cavity Surface-Emitting Laser)

A laser with the lasing cavity running vertically

through the layers of the semiconductor chip, which is mirrored at the bottom in order to maximize signal emission power at the top surface.VCSELs have capabilities somewhere between LEDs and other lasers.

VCSELS have a spectral width somewhere between the two.VCSELs can couple effectively to a multimode fiber (MMF) with a narrower core than LEDs (50 microns versus 62.5 microns), but not as narrow (5–10

microns) as the single-mode fiber (SMF) to which a distributed feedback (DFB) laser connects.VCSELs also have a faster cycle time than LEDs, if somewhat slower than DFB lasers, and, therefore, have bandwidth capabilities somewhere between the two.The first generation of VCSELs operates in the 850 nm window. The second generation (2005) of VCSELs can run in the 1300 nm and 1310 nm regions.VCSELs are used primarily in high-speed LAN applications. See also cycle time, DFB laser, laser, LED, MMF, SMF, and window.

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