Photonics Dictionary: L

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large-core fiber

Optical fiber with a large core, often a step-index fiber; "large'' is at times defined as greater than 85 µm.

laser diode -> diode laser

A diode laser is a type of laser that uses a semiconductor diode as the active medium to generate coherent light. Semiconductor diodes are electronic devices that conduct electricity primarily in one...

laser

A laser, which stands for "light amplification by stimulated emission of radiation," is a device that produces coherent and focused beams of light through the process of optical amplification based...

lateral load test

A method of measuring microbending losses in optical fiber by sandwiching a length of fiber between two parallel plates, with 150-grit sandpaper on the bottom plate. Different weights are placed on...

launch angle

The angle between the light input propagation vector and the optical axis of an optical fiber or fiber bundle.

LCPOF

large-core plastic optical fiber

light pipe

Transparent matter that usually is drawn into a cylindrical, pyramidical or conical shape through which light is channeled from one end to the other by total internal reflections. Optical fibers are...

lightguide -> fiber optic lightguide

A bundle of optical fibers arranged randomly for the purpose of transmitting energy, not an image.

lip

A defect in the cleaved end face of an optical fiber, in the form of a sharp protrusion at the edge of the fiber.

liquid core optical fiber

Multimode straight fiber capable of transporting linearly polarized light with any incident polarization angle, and in which no form of internal stress can develop that could lead to birefringence.

liquid lightguide

An optical fiber with a hollow core filled with a liquid material that has a higher refractive index than the solid surrounding it.

longitudinal offset loss -> gap loss

The optical power loss caused by a space between axially aligned fibers.

low-loss fiber

Optical fiber that transmits a greater percentage of input light than does high-loss step-index fiber. Low-loss fiber requires higher purity materials and a more sophisticated drawing process and...

Photonics DictionaryL

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