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Grating Enables Tunable Fiber Laser for Telecom

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Breck Hitz

Today's fiber optic telecom systems use a different fixed-frequency semiconductor laser to transmit each channel into the optical fiber. If these individual lasers were tunable -- that is, capable of switching from one wavelength channel to another -- it would add great flexibility to the network. Even better, if a single laser were capable of generating all the channels simultaneously, it would not only add flexibility, but also simplify the network design. For these reasons, researchers worldwide are investigating techniques to tune lasers and to build devices capable of simultaneous...Read full article

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    Published: October 2003
    Glossary
    diffraction grating
    A glass substrate carrying a layer of deposited aluminum that has been pressure-ruled with a large number of fine equidistant grooves, using a diamond edge as a tool. Light falling on such a grating is dispersed into a series of spectra on both sides of the incident beam, the angular dispersion being inversely proportional to the line spacing. By proper shaping of the diamond edge, however, the grooves can be formed in such a way as to concentrate most of the energy into a single spectral...
    erbium-doped fiber amplifier
    An optical fiber that can be used to amplify an optical input. Erbium rare earth ions are added to the fiber core material as a dopant in typical levels of a few hundred parts per million. The fiber is highly transparent at the erbium lasing wavelength of two to nine microns. When pumped by a laser diode, optical gain is created, and amplification occurs.
    optical fiber
    Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light signals over long distances with minimal loss of signal quality. It serves as a medium for conveying information in the form of light pulses, typically in the realm of telecommunications, networking, and data transmission. The core of an optical fiber is the central region through which light travels. It is surrounded by a cladding layer that has a lower refractive index than...
    Communicationsdiffraction gratingerbium-doped fiber amplifierfiber lasersfiber opticsoptical fiberResearch & Technologyring lasersemiconductor lasersTunable LasersLasers

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