Fiber Optic Wiki

Fiber Fanout Kit (breakout kit)

July 12, 2011

A fanout kit is a set of empty jackets designed to protect the fragile tight buffered strands of fibre cables that require individual termination without splicing any fibre pigtail or needing to mount any protective enclosure. This is normally an option with fibre distribution cable, or sometimes loose buffer or ribbon cable, because these types of cable contain multiple strands that are designed for a permanent termination.

Fiber Fanout cable

July 12, 2011

Breakout-style (or fanout-style) fiberoptic cable, often referred to as just "breakout cable", is basically several jacketed simplex fibers packaged individually inside one jacket. This differs from distribution style cable, in which several tight-buffered fibers are bundled together within the same jacket. The design of the breakout-style cable adds strength to the cable for ruggedised drops, although it does make it larger and more expensive than distribution-style cable. Breakout cable is suitable for short riser and plenum applications and also for use in conduits, where a very simple cable run is planned to avoid the use of any splice box or spliced fibre pigtail.

Fiber laser

July 12, 2011

A fiber laser or fibre laser is a laser in which the active gain medium is an optical fiber doped with rare-earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, and thulium. They are related to doped fiber amplifiers, which provide light amplification without lasing. Fiber nonlinearities, such as stimulated Raman scattering or four-wave mixing can also provide gain and thus serve as gain media for a fiber laser.

Double-clad fibers

July 12, 2011

Double-clad fiber.Main article: Double-clad fiber.Many high-power fiber lasers are based on double-clad fiber. The gain medium forms the core of the fiber, which is surrounded by two layers of cladding. The lasing mode propagates in the core, while a multimode pump beam propagates in the inner cladding layer. The outer cladding keeps this pump light confined. This arrangement allows the core to be pumped with a much higher-power beam than could otherwise be made to propagate in it, and allows the conversion of pump light with relatively low brightness into a much higher-brightness signal. As a result, fiber lasers and amplifiers are occasionally referred to as "brightness converters."

One operation at a time

July 11, 2011

This is caused by the omission of both overlapped and queued feature sets from most parallel ATA products. Only one device on a cable can perform a read or write operation at one time, therefore a fast device on the same cable as a slow device under heavy use will find it has to wait for the slow device to complete its task first.

HDD passwords and security

July 11, 2011

The disk lock is a built-in security feature in the disk. It is part of the ATA specification, and thus not specific to any brand or device. The disk lock can be enabled and disabled by sending special ATA commands to the drive. If a disk is locked, it will refuse all access until it is unlocked.

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