Fiber Optic Wiki

Switching, multiplexing, and grooming of traffic in an OEO device

July 23, 2011

Optical mesh networks refer to transport networks that are built directly off the mesh-like fiber infrastructure deployed in metropolitan, regional, national, or international areas by deploying optical transport equipment that are capable of switching traffic from an incoming fiber to an outgoing fiber.

Shared backup path protection

July 23, 2011

Optical mesh networks support the establishment of circuit-mode connection-oriented services. Multiple recovery mechanisms that provide different levels of protection or restoration against different failure modes are available in mesh networks.

Power measuring range

July 22, 2011

A typical OPM measures accurately under most conditions from about 0 dBm (1 milli Watt) to about -50 dBm (10 nano Watt), although the display range may be larger. Above 0 dBm is considered "high power", and specially adapted units may measure up to nearly + 30 dBm ( 1 Watt).

Fiber-optic attenuator applications

July 22, 2011

An optical attenuator is a device used to reduce the power level of an optical signal, either in free space or in an optical fiber. The basic types of optical attenuators are fixed, step-wise variable, and continuously variable.

Optical time-domain reflectometer

July 22, 2011

An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR injects a series of optical pulses into the fiber under test.

Attenuation Dead Zone

July 22, 2011

Dead zone is classified in two ways. Firstly, an "Event Dead Zone" is related to a reflective discrete optical event. In this situation, the measured dead zone will depend on a combination of the pulse length, and the size of the reflection. Secondly, an "Attenuation Dead Zone" is related to a non-reflective event.

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