optyka: Optical amplifier

Evidence: 100 • authority: 72

An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics. They are used as optical repeaters in the long distance fiber-optic cables which carry much of the world's telecommunication links. There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers. In doped fiber amplifiers and bulk lasers, stimulated emission in th…

Evidence: 58 • authority: 72

The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon. One plate is very thin and faces toward the speaking person, acting as a diaphragm. Sound waves striking the diaphragm cause it to vibrate, exerting a varying pressure on the granules, which in turn changes the electrical resistance between the plates. Higher pressure lowers the resistance as the granules are pushed closer together. A steady direct current is passed between the plates through the granules. The varying resistance results…

Evidence: 50 • authority: 72

A microphone, colloquially called a mic (), or mike, is a transducer that converts sound into an electrical signal. Microphones are used in telecommunication, sound recording, broadcasting, and consumer electronics, including telephones, hearing aids, and mobile devices. Several types of microphone are used today, which employ different methods to convert the air pressure variations of a sound wave to an electrical signal. The most common are the dynamic microphone, which uses a coil of wire suspended in a magnetic field; the condenser microphone, which uses the vibrating diaphragm as a capacitor plate; and the contact microphone, which uses a crystal of piezoelectric material. Microphones…

Evidence: 50 • authority: 72

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow and the optical amplifier patented by Gordon Gould. A laser differs from other sources of light in that it emits light that is coherent. Spatial coherence allows a laser to be focused to a tight spot, enabling uses such as optical communication, laser cutting, and lithography. It also allows a…

Evidence: 42 • authority: 80

Generation of Optical Single Side Band Signal Using Semiconductor Optical Amplifier for 5G signal

Evidence: 42 • authority: 80

Novel optical preamplifier with inverted ASE signal of semiconductor optical amplifier

Evidence: 42 • authority: 80

All-optical Regeneration and Signal Processing with Semiconductor Optical Amplifier based Devices

Evidence: 42 • authority: 80

Semiconductor Optical Amplifier Based Ultrafast Signal Processing Devices

Evidence: 42 • authority: 80

Fiber Optical Parametric Amplifier as Optical Signal Processor

Evidence: 42 • authority: 92

Monolithic Opto-Acoustic Synesthetic Transduction of Color and Sound in a Single Chiral Liquid Crystal Elastomer.. Chiral liquid crystal elastomers (CLCEs) have been widely explored for structural color modulation via tunable photonic bandgaps, yet their functionality has remained largely limited to optical responses. Here, we introduce an opto-acoustic chiral liquid crystal elastomer actuator (OA-CLCEA) that redefines CLCEs as intrinsically multimodal transducers, enabling simultaneous color modulation and sound generation within a single soft material layer. Under a static DC electric field, Maxwell stress induces thickness compression and reduces the chiral pitch, producing continuous, w…

Evidence: — • authority: 72

A pickup is an electromagnetic transducer that converts energy from one form to another that captures or senses mechanical vibrations produced by musical instruments, particularly string instruments such as electric guitars, and converts these to an electrical signal that is amplified using an instrument amplifier to produce musical sounds through a loudspeaker in a speaker enclosure. The signal from a pickup can also be recorded directly. The first electrical string instrument with pickups, the "Frying Pan" slide guitar, was created by George Beauchamp and Adolph Rickenbacker around 1931. Most electric guitars and electric basses use magnetic pickups. Acoustic guitars, upright basses, and…

Evidence: — • authority: 72

Auricon cameras were 16 mm film single-system sound-on-film motion picture cameras manufactured in the 1940s through the early 1980s. Auricon cameras are notable because they record sound directly onto an optical or magnetic track on the same film that the image is photographed on, thus eliminating the need for a separate audio recorder. The camera preceded ENG video cameras as the main AV tool of television news gathering due to its portability–and relatively quick production turn-around–where processed negative film image could be broadcast by electronically creating a positive image. Additionally, the Auricon found studio use as a 'kinescope' camera of live video off of a TV screen, but…