Overview of Plesiochronous Digital Hierarchy And of Synchronous Digital Hierarchy (PDH and SDH) With the introduction of PCM technology in the 1960s, communications networks were gradually converted to digital technology over the next few years. To cope with the demand for ever higher bit rates, a multiplex hierarchy called the plesiochronous digital hierarchy (PDH) evolved. … [Read more...] about Plesiochronous Digital Hierarchy And of Synchronous Digital Hierarchy (PDH and SDH)
Engineering Physics
Environment Effect on Optical Fiber | OFC Splicing
What are the Environment Effect on Optical Fiber? What is OFC Splicing? THE ENVIRONMENT EFFECT There are however always small defects at the surface of the fiber, called microcracks. These cracks grew when water vapour is present and the fiber simultaneously is under strain, hence shortening the life of the fiber. Another effect ingress of water, which may increase of … [Read more...] about Environment Effect on Optical Fiber | OFC Splicing
Losses in Optical Fiber: Attenuation | Dispersion | Tube Buffering
What is the Attenuation? How many types of Dispersion? How many types of Fiber Buffering Loose? What is the Tube Buffering? ATTENUATION: loss of optical power Attenuation is defined as the loss of optical power over a set distance, a fiber with lower attenuation will allow more power to reach a receiver than fiber with higher attenuation. Attenuation may be categorized as … [Read more...] about Losses in Optical Fiber: Attenuation | Dispersion | Tube Buffering
Types of Fiber Optics
How many types of Fiber Optics? Types of Fiber Optics: The refractive Index profile describes the relation between the indices of the core and cladding. Two main relationship exists : (I) Step Index (II) Graded Index The step index fiber has a core with uniform index throughout. The profile shows a sharp step at the junction of the core and cladding. In contrast, the … [Read more...] about Types of Fiber Optics
Fiber Optics in Brief
What is the Fiber Optics Communication System? Fiber Optics: Optical Fiber is new medium, in which information (voice, Data or Video) is transmitted through a glass or plastic fiber, in the form of light, following the transmission sequence give below : (1) Information is encoded into electrical signals. (2) Electrical signals are converted into light signals. (3) … [Read more...] about Fiber Optics in Brief