Publication

Measurement of the distributed-Brillouin-gain spectrum in optical fibers by using a single laser source

Luc Thévenaz
1994
Conference Papers

Abstract

Brillouin-gain-spectrum measurement along an optical fiber has recently gained a lot of interest owing to its potential for strain monitoring in installed cables and for distributed temperature sensing. We present a method that has the following advantages: (1) few optical elements are required, (2) a single laser source is used, and (3) a single fiber end is accessed. A schematic diagram of the experimental setup is shown. The operation of this setup relies on two features. First, the pump and probe signals are pulses that both propagate back and forth through the fiber by using a reflection at the far end. The second and more important feature is the use of a guided-wave intensity modulator for pulsing the laser light to form the pump signal and for generating the probe signal

Official source

https://infoscience.epfl.ch/entities/publication/2212c532-f805-430a-969f-1658f7d68946

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Luc Thévenaz
1994
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2212c532-f805-430a-969f-1658f7d68946

About this result

Related concepts (32)

Optical fiber

An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables.

Optical amplifier

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 fiberoptic cables which carry much of the world's telecommunication links.

Fiber-optic cable

A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable is used. Different types of cable are used for optical communication in different applications, for example long-distance telecommunication or providing a high-speed data connection between different parts of a building.

Related publications (32)

Measurement of the distributed-Brillouin-gain spectrum in optical fibers by using a single laser source

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