October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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463Transmission Media for PDH/SDH and OFC Technology
For 1550 nm,
f = (3 × 10
8
)/(1550 × 10
−9
)
= 1.93 × 10
14
Hz
= 193 THz (approximate)
The optical ber communication uses 2.3 × 10
14
and 1.93 × 10
14
Hz frequen-
cies, which fall in the “near infrared” region of the electromagnetic spectrum
(close to red color of visible light), due to their low attenuation.
The above gures of attenuation are not always true, but they depend on
the type of ber. The stated values are for a “single-mode” ber made of
“glass.” In the next section, we will see various types of bers.
15.2.3 Types of Optical Fibers
The optical bers may be classied on the basis of material of construction,
mode of operation, and the type of refractive index deployed. On the ...
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