Fiber Optic Wiki

The Advantages Of Fiber Optics

November 1, 2011

Why are fiber-optic systems revolutionizing telecommunications. Compared to conventional metal wire (copper wire), optical fibers are: Less expensive - Several miles of optical cable can be made cheaper than equivalent lengths of copper wire. This saves your provider (cable TV, Internet) and you money. Thinner - Optical fibers can be drawn to smaller diameters

How Are Optical Fibers Made

November 1, 2011

Now that we know how fiber-optic systems work and why they are useful -- how do they make them. Optical fibers are made of extremely pure optical glass. We think of a glass window as transparent, but the thicker the glass gets, the less transparent it becomes due to impurities in the glass. However, the glass in an optical fiber has far fewer impurities than window-pane glass. One company's description of the quality of glass is as follows: If you were on top of an ocean that is miles of solid core optical fiber glass, you could see the bottom clearly.

Physics of Total Internal Reflection

November 1, 2011

When light passes from a medium with one index of refraction (m1) to another medium with a lower index of refraction (m2), it bends or refracts away from an imaginary line perpendicular to the surface (normal line). As the angle of the beam through m1 becomes greater with respect to the normal line, the refracted light through m2 bends further away from the line.

How Does an Optical Fiber Transmit Light

November 1, 2011

Suppose you want to shine a flashlight beam down a long, straight hallway. Just point the beam straight down the hallway -- light travels in straight lines, so it is no problem. What if the hallway has a bend in it? You could place a mirror at the bend to reflect the light beam around the corner. What if the hallway is very winding with multiple bends? You might line the walls with mirrors and angle the beam so that it bounces from side-to-side all along the hallway. This is exactly what happens in an optical fiber.

The SFP+ Passive Copper Cables

November 1, 2011

SFP+ passive cable assemblies are designed to interconnect a variety of common physical layer standards including Gigabit Ethernet, Fibre Channel, Serial Attached SCSI, and InfiniBand. The superior electro magnetic interference (EMI) girdle design ensures the industry's lowest EMI interference. Low power helps to maximize the number of ports that can be used per host board. I2C (Inter-IC bus protocol) interface and on-board EEPROM features enable the host to detect or configure specific performance characteristics.

The IP Addresses

October 31, 2011

To keep all of these machines straight, each machine on the Internet is assigned a unique address called an IP address. IP stands for Internet protocol, and these addresses are 32-bit numbers, normally expressed as four "octets" in a "dotted decimal number." A typical IP address looks like this: 216.27.61.137The four numbers in an IP address are called octets because they can have values between 0 and 255, which is 28 possibilities per octet.

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