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Advantages of VCSEL Lasers
VCSEL lasers have the economic advantage over any other diode lasers. This short explanation tells you why. A typical VCSEL consists of two oppositely-doped Distributed Bragg Reflectors (DBR) with a cavity layer between. In the center of the cavity layer resides an active region, consisting of multiple quantum wells. Current is injected into the active region via a current guiding structure either provided by an oxide aperture or proton-implanted surroundings. As the entire cavity can be grown with one-step epitaxy, these lasers can be manufactured and tested on a wafer scale. This presents a significant manufacturing advantage.
- Tags: Test Equipment, VCSEL
What does the TIA/EIA-568-B Standard Cover?
The TIA/EIA-568–B standard is a “Commercial Building Telecommunication Cabling Standard”. The standard specifies a physical star topology. It also covers the cable specification, performance and installation requirements. TIA/EIA-568–B structured cabling system consists of six cabling subsystems: Work Area Horizontal Cabling Telecommunication Closet Backbone Cabling Equipment Room Building Entrance Work Area: Work area covers from the telecommunication outlet to the station equipment. The design purpose of work area wiring is to be simple to shift, add or and change cables. Components in a Work Area: Station equipment such as computers, data terminals, telephones, etc. Patch cables such as modular patch cords, pc adapter
- Tags: Fiber Optic Technology
Fiber Optic Cable Characteristics of Interbuilding Cables (Backbone Fiber Optic Cables)
The interbuilding backbone fiber optic cabling is the part of a fiber optic network that provides the designer with the most flexible options. However it is also the most constrained by duct availability, right-of-way and other physical barriers. The interbuilding backbone fiber cables must provide some basic characteristics provided its critical application environment. The following list is not exhaustive at all but a minimum requirement. Offers excellent attenuation performance over a wide range of temperatures Sufficiently strong to endure the rigors of installation Its sheath should provide protection against ultraviolet radiation Its sheath should provide protection against gnawing rodents and
- Tags: Fiber Optic Cable
How do I make a perfect fusion splice?
Fusion splice process is to literally weld two prepared fiber ends together, thereby creating a permanent joint with the minimum possible insertion loss. The fusion splice process is illustrated as follows. So what factors in the fusion splice process determine the insertion loss achieved? The loss mechanism in fusion splice joint may be summarized as follows: Core misalignment. Although normally aligned using the cladding diameter as the reference surface, it is generally believed that the complex surface tension and viscosity structures within the core and the cladding do tend to minimize the actual core misalignment. Core diameter. The allowable diameter
- Tags: Fiber Splicing
Interpreting Standards and Specifications
Cabling professionals should purchase a full copy of the TIA/EIA-568–B Standard; you can do so at the Global Engineering Documents web site: http://global.ihs.com Now here is a little tip on interpreting the Standards and Specifications once you get one copy. Standards and Specification documents are worded with precise language designed to spell out exactly what is expected of an implementation using that specification. If you read carefully, you may notice that slightly different words are used when stating requirements. If you see the word shall or must used when stating a requirement, if signifies a mandatory requirement. Words such as