Fiber Optic Wiki

Contention resolution

September 26, 2011

Whenever two or more data packets arrive at a network node at the same time and contend for the same output, external blocking occurs. All packets but one are perceived as superfluous, and have to be dealt with. Next to the obvious choice of dropping all excess packets, academic literature typically presents three solutions: buffering, deflection routing or wavelength conversion. Optical buffering uses fiber delay lines (FDLs) to delay the light, and is regarded as the most effective, but comes with the additional cost of the FDLs.

Time stretch analog-to-digital converter

September 26, 2011

Time-stretch analog-to-digital converter (TS-ADC) is an analog-to-digital converter (ADC) system that has the capability of digitizing very high bandwidth signals that cannot be captured by conventional electronic ADCs. Alternatively, it is also known as the Photonic Time Stretch (PTS) digitizer, since it uses an optical frontend. It relies on the process of time-stretch, which effectively slows down the analog signal in time (or compresses its bandwidth) before it can be digitized by a slow electronic ADC.

Fiber to the premises

September 24, 2011

Fiber to the premises is a form of fiber-optic communication delivery in which an optical fiber is run from the central office all the way to the premises occupied by the subscriber.

FTTH vs. FTTB

September 24, 2011

Fiber to the premises can be categorized according to where the optical fiber ends:FTTH (fiber to the home) is a form of fiber optic communication delivery in which the fiber extends from the central office to the subscriber's living or working space.[6] Once at the subscriber's living or working space, the signal may be conveyed throughout the space using any means, including twisted pair, coaxial cable, wireless, power line communication, or optical fiber.

Direct fiber

September 24, 2011

The simplest optical distribution network can be called direct fiber. In this architecture, each fiber leaving the central office goes to exactly one customer. Such networks can provide excellent bandwidth since each customer gets their own dedicated fiber extending all the way to the central office. However, this approach is about 10% more costly due to the amount of fiber and central office machinery required.

Active optical network

September 24, 2011

Comparison showing how a typical active optical network handles downstream traffic differently than a typical passive optical network. The type of active optical network shown is a star network capable of multicasting. The type of passive optical network shown is a star network having multiple splitters housed in the same cabinet.

|< < .... 95 96 97 98 99 100 101 102 103 104 105 .... > >|

Showing 595 to 600 of 1106 (185 Pages)