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- Step up and become DINTEK certifiedHave you ever considered becoming a DINTEK Authorized Installer or DINTEKnTrained Installer? Depending on your level of experience, we offer anrange of options to help you obtain certification, from one and three day courses for full DTI & DCI certification to cross-accreditationnand online courses for DAI certification. Becoming certified brings yourncustomers many benefits, as outlined in the article below, including the advantage of accessing the DINTEK 25 year product or full systemnwarranty.To apply for more information on the options available, please visit our certification page at http://certification.dintek.com.tw and fill in the form on the right hand side. We will be pleased to discuss the options with you.
- Single-mode optical fiber - which type is best?Following on from our earlier articles on Fiber Optics Technology (readnhere on Fiber Optics Theory) we now look closer at the single-mode fibernand explore the two most commonly used types – ITU-T G652D and G657A2.Designsnof single-mode fiber have evolved over the decades and present daynoptions offer most often than not, the G652D fiber. This backwardsncompatible fiber has been used in networks for over 30 years and offersnrespectable attenuation (the amount of light lost between input andnoutput) and provides marginally lower loss transmission which is betternin facilitating long distance communication links (up to and greaternthan 100km). However, the biggest difference between G652D and G657A2ncan be found in their ability to bend.Compared to G652D fibersnwhich have limited bend resistance, the G657A2 fiber offers an improvednbend radius and flexibility which may allow for better cable managementnand routing in congested areas and also allow for increased density innhigh-density patching fields. G657A2 fiber is becoming more popular fornuse in advanced access cable network installations, where bendnresistance is required for smaller cable and cords installation radii,nproviding for low-cost installation, miniaturisation and higher densitynconnectorization.The below diagram clearly illustrates the difference in bending radii for G652 and G657 fibers
- Fiber ConstructionOptical fiber for telecommunications consists of three components: core, cladding and coating. The core is the central region of an optical fiber through which light is transmitted. Inngeneral, the telecommunications industry uses sizes from 8.3nmicrometers (µm) to 62.5 micrometers. The standard telecommunicationsncore sizes in use today are 8.3 µm (single-mode), 50 µm (multimode), andn62.5 µm (multimode). (Single-mode and multimode will be discussednshortly.) The cladding is a glass sheath that surrounds the core,nwhich acts like a mirror, reflecting light back into the core. Thencladding itself is covered with a plastic coating and strength materialnwhen appropriate. The diameter of the cladding surrounding each of thencores is typically 125 µm.Light in the core travels slightlynslower than light in the cladding and this property tends to keep anynlight sent into the core from one end of the fiber from leaking out,nuntil it reaches the far end. The core and cladding arenmanufactured together as a single piece of silica glass with slightlyndifferent compositions, and cannot be separated from one another. Thenglass does not have a hole in the core, but is completely solidnthroughout.The third section of an optical fiber is thenouter protective coating. This coating is typically an ultraviolet (UV)nlight-cured acrylate applied during the manufacturing process to providenphysical and environmental protection for the fiber. During theninstallation process, this coating is stripped away from the cladding tonallow proper termination to an optical transmission system. How is the fiber made?Create the pre-formTake glass tubeInject germanium and silicon dioxideFuse internal gasses into a glassDraw optical fiber from the pre-formAttach coating layer while drawingRoll drawn fiber off onto rollsTest fiber
C-Net Technologies (T) Limited,
Ground Floor, Tiffany Diamond Hotel,
Morogoro Road and Indira Gandhi Street.
P.O. Box 75726, Dar Es Salaam.