What does SI stand for?

Step-Index

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

After introducing the nomenclature and notations, seven chapters discuss integrated optics, including coverage of step-index thin-film waveguides, graded-index thin-film waveguides, propagation loss in thin-film waveguides, three-dimensional waveguides with rectangular boundaries, optical directional couplers and their applications, guided-wave gratings, and arrayed-waveguide gratings.

Foundations for guided wave optics

The MAP artifact consists of a short section of polarizing fiber spliced to a single mode input fiber and a step-index multimode output, and its PDL is certified over the 1535 nm to 1560 nm wavelength range.

NIST releases two new calibration standards for optical fiber ...

The RCLED is designed for 250 Mbaud Plastic Optical Fiber (POF) communication at 650 nm, and is optimized for high-speed data rates and for launching optical power efficiently into the Step-Index POF-fiber.

Mitel Semiconductor Introduces New Optoelectronics Devices Designed ...