TO Caps & Lenses
A Transistor Outline (TO) is the name of an international industrial standard that governs a particular type of current-conducting electronic housing. A TO package always consists of two components: a header and a cap. In opto-electronics, the caps fulfill two primary functions. First, they reliably and permanently protect the optical components of transmission as well as reception applications. Second, they ensure the transmission of the optical signals by acting as an optical interface. The optical properties of the windows or lenses installed into the TO caps must therefore fulfill extremely high requirements.
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