The Optical Telescope Element (OTE) is the eye of the James Webb Space Telescope Observatory. The OTE consists of the mirrors as well as structures and subsystems that support the optics.

OBSERVATORY

Optical Telescope Element (OTE)

The OTIS out of cryovac chamber at NASA Johnson.
The OTIS (OTE+ISIM) out of cryovac chamber at NASA Johnson. The OTIS is an acronym that includes the OTE plus the Integrated Science Instrument (ISIM) package - essentially the optics and science instruments. Credit: NASA/Chris Gunn

The Optical Telescope Element (OTE) is the eye of the James Webb Space Telescope Observatory. The OTE gathers the light coming from space and provides it to the science instruments. The OTE consists of the mirrors as well as structures and subsystems that support the optics.

The OTE consists of :

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OTE engineering diagram