Also called a "frequency band." See frequency bands, spectrum, satellite frequency bands and optical bands. (2) A group of frequencies that occur naturally such as the audio spectrum. See audio.

A modulator developed by researchers from ETH Zurich has broken the terahertz mark. The ultrafast component efficiently ...

Researchers have developed a next-generation plasmonic modulator that enables optical data transmission at record-breaking ...

By increasing the applied optical power ... a series of phase-locked lasers separated in frequency by the resonator's free spectral range. It can be demodulated by a fast photodiode to produce ...