Fiber Optic Wiki

Fibre Channel infrastructure

June 30, 2011

SAN-switch with optical FC connectors installed.Fibre Channel switches can be divided into two classes. These classes are not part of the standard, and the classification of every switch is a marketing decision of the manufacturer:

Fibre Channel Host Bus Adapters

June 30, 2011

Fibre Channel HBAs are available for all major open systems, computer architectures, and buses, including PCI and SBus. Some are OS dependent. Each HBA has a unique World Wide Name (WWN), which is similar to an Ethernet MAC address in that it uses an Organizationally Unique Identifier (OUI) assigned by the IEEE. However, WWNs are longer (8 bytes). There are two types of WWNs on a HBA; a node WWN (WWNN), which can be shared by some or all ports of a device, and a port WWN (WWPN), which is necessarily unique to each port.

Fibre Channel 8B/10B encoding

June 30, 2011

The Fibre Channel FC1 data link layer implements the 8b/10b encoding and decoding of signals.

Fibre Channel signal characteristics

June 30, 2011

Fibre channel electrical signals are sent over a duplex differential interface. This usually consists of twisted-pair cables with a nominal impedance of 75 ohms (single-ended) or 150 ohms (differential). This is a genuine differential signalling system so no ground reference is carried through the cable, except for the shield. Signalling is AC-coupled, with the series capacitors located at the transmitter end of the link.

Fibre Channel connector pinouts

June 30, 2011

There are various Fibre Channel connectors in use in the computer industry. Details of their pinouts are distributed between different official documents. The following sections describe the most common Fibre Channel pinouts with some comments about the purpose of their electrical signals.

Fiber Bragg grating sensors

June 29, 2011

As well as being sensitive to strain, the Bragg wavelength is also sensitive to temperature. This means that fiber Bragg gratings can be used as sensing elements in optical fiber sensors. In a FBG sensor, the measurand causes a shift in the Bragg wavelength, ΔλB. The relative shift in the Bragg wavelength, ΔλB / λB, due to an applied strain (ε) and a change in temperature (ΔT) is approximately given by. Here, CS is the coefficient of strain, which is related to the strain optic coefficient pe. Also, CT is the coefficient of temperature, which is made up of the thermal expansion coefficient of the optical fiber, αΛ, and the thermo-optic coefficient, αn.

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