A device used to prevent lightwaves from reflecting backwards (the optical counterpart to an electrical diode). It is a one-way filter for a range of light frequencies.
A device used in a high-speed, high-power fiber optic transmission system (FOTS) to isolate erbium-doped fiber amplifiers (EDFAs), laser diode light sources and other devices.The optical isolators act as diodes, preventing signals from propagating in the upstream direction and confusing the downstream signal or device generating it. See also diode, EFDA, FOTS, and laser diode.
A device containing a short length of optical fiber and inserted into an electrified communications link to electrically isolate the attached devices from ground loops, power spikes, and surges. Such an optical isolator can act as a repeater, as well as a protector. See also link, optical fiber, protector, and repeater.