Documents

Definition of Fibre Optic

Description
good
Categories
Published
of 28
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  Definition of Fibre Optic Fibre Optic is a thin strand of highly transparent glass or sometimes plastic that guide light. It is used as a medium for carrying information from one point to another in the form of light. A basic fibre optic system consists of a transmitting device, which generates the light signal; an optical fibre cable, which carries the light; and a receiver, which accepts the light signal transmitted. The fibre itself is passive and does not contain any active properties Basic Construction of Optical Fibre . 1.Core: The centre of the fibre through which the light is transmitted . 2. Cladding:   The outside optical layer of the fibre that traps the light in the core and guides it along and even through curves. 3. Buffer coating or primary coating :  A hard plastic coating on the outside of the fibre that protects the glass from moisture or physical damage.Fiber optic cable functions as a light guide, guiding the light introduced at one end of the cable through to the other end. The core and cladding are manufactured together as a single piece of silica glass. The core region’s refractive index (or optical density) is greater than the   CoreCladdingCoating Core8.3µm Cladding125µm Coating250µm Cross Sectional View of a Single Mode FiberSide View of a Single Mode Fiber  cladding layer. The glass does not have a hole in the core, but is completely solid throughout. The light is guided down through the core. The cladding traps the light in the core using anoptical technique called total internal reflection.” The third section of an optical fibre is the outer protective coating called the primary buffer coating . This coating is typically an ultraviolet (UV) light-cured acryl ate applied during the manufacturing process to provide physical and environmental protection for the fibre. During the installation process, this coating is stripped away from the cladding to allow proper termination to an optical transmission system. Constructional Details of Fibre Optic Cable   Rip CordWater Blocking Material (Jelly)Outer Sheath (Jacket)Double Layer for Direct Buried  Single Layer for Duct CableSteel for !rounding hread  #aper Dielectric Strength $le%ent (&e'lar)Central Strength Me%ber Optical ibre!el*illed Buffer ubeOuter Sheath (Jacket)Steel heath for !roundingDielectric Strength $le%ent (&e'lar) hread and #aper !el illed Buffer ubeCentral Strength Me%ber Optical fibre  Types of Fiber Optic Cables There are two types of fiber optic cable commonly used:  1.Multi Mode Cables2.Single Mode Cables 1.Multi Mode Cables Over the years a variety of core sizes have been produced but these days there are only two main sizes for Multimode fibers. These cables are most widely used in data networks. The numbers 50/125 & 62.5/125 represent the diameters of the fibre core and cladding, these are measured in microns which are millionths of a metre.   2.Single Mode Cable Single Mode cable has a core diameter of 8.3 to 10 microns. It is the most commonly used cable in Telecommunication for transmission systems. The numbers 8.3/125 represent the diameters of the fiber core and cladding, Note:Both multimode and single mode fibres have an outside diameter of 125 microns - about 5 thousandths of an inch - just slightly larger than a human hair.  Definitions of Terms used in Fibre Optic Cable 1.Terminations ã Patch panels:- Provides a centralized location for patching fibres, testing, monitoring and restoring cables. ã Connector :  A non-permanent device for connecting two fibres or fibres to equipment where they are expected to be disconnected occasionally for testing or rerouting. It also provides protection to both fibres. ã Ferrule :  A tube which holds a fibre for alignment, usually part of a connector ã LC Connector LC stands for Latched Connector and its interconnect is based upon the RJ-45 telephone interface. The LC Connector uses Zirconia ceramic ferrules in a free-floating and pull proof design.   ã SC connector   SC Stands for Single Coupling. It is Square shaped snap-in connector that latches with a simple push-pull.   The SC connector has the advantage (over ST) of being duplexed into a single connector clip with both transmit/receive fibres. ã MU Connector The MU stands for Miniature Unit fibre-optic connector, which features compact size, high packaging density, and high performance and a simple push-pull design. The MU connector ferrules are half the size of the standard FC, SC connectors and are excellent for high density installations.
Search
Tags
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks