Question

A light signal is travelling through a fiber. What
is the delay in the signal if the length of the
fiber-optic cable is, 100 m, (assume a
propagation speed of 2 x 108 m/s)?​

Answer 1

Answer:

Optical fiber is the technology associated with data transmission using light pulses travelling along with a long fiber which is usually made of plastic or glass. Metal wires are preferred for transmission in optical fiber communication as signals travel with fewer damages. Optical fibers are also unaffected by electromagnetic interference. The fiber optical cable uses the application of total internal reflection of light. The fibers are designed such that they facilitate the propagation of light along with the optical fiber depending on the requirement of power and distance of transmission. Single-mode fiber is used for long-distance transmission, while multimode fiber is used for shorter distances. The outer cladding of these fibers needs better protection than metal wires.

Answer 2

Answer:

Concept:

The time it takes for a signal to travel through a medium, or the propagation delay, determines how long it will take for a signal to be received after it has been delivered.

Step-by-step explanation:

Given:

Length of the fiber-optic cable is, 100 m

To find:

Delay in propagation

Solution:

• A telecommunications network's design and performance feature is network latency.
• It describes the time it takes for a piece of data to go from one communication endpoint to another across the network. It is often expressed in fractions or multiples of seconds.
• The latency is 5 sec per kilometer because light moves through optical fiber 1.5 times more slowly than it does in a vacuum.
• Propagation delay can be found by the formula,

          $propagation-delay=\frac{diatance}{propagation -speed}$

                                            $=\frac{100}{2\times 10^{8} }$

                                             $=50\times10^{-8}$

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