Calculate the maximum length of an optical fibre, Electrical Engineering

Calculate the maximum length of an optical fibre that exhibits 0.8dB/km attenuation if the optical output is 10mW and the power launched at the input is 150mW. [Hint: Loss, L=10 log (P_o/P_i)]

Ans:

Given

P_o=10mW

P_i=150mw

We have

Loss, L=10 log (P_o/P_i)

Substituting for P_oand P_i,

L= -11.76dB

For 1km , the loss is 0.8dB.

Let the length of the cable be x km. Then, for x kms, the loss is -11.76dB.

Solving for x, we have

x= (11.76 x 1)/0.8

=15km

i.e the length of the cable is 15km approximately.

Related Discussions:- Calculate the maximum length of an optical fibre

Sid input - serial input output ports , SID Input Serial input data ...

SID Input Serial input data single bit can be accepted through this pin using RIM command discussed in details in chapter8.

Norton''s theorem, real time uses of norton''s theorem

real time uses of norton''s theorem

Find the average power absorbed by each element, Q. Let v(t) = V max cos ω...

Q. Let v(t) = V max cos ωt be applied to (a) a pure resistor, (b) a pure capacitor (with zero initial capacitor voltage, and (c) a pure inductor (with zero initial inductor curren

Define the parity with respect to serial communication, With respect to ser...

With respect to serial communication define the parity. Besides the synchronization given by the use of start and stop bits, an additional bit termed as a parity bit may opt

Explain norton''s theorem procedure, Norton's theorem procedure: 1. Re...

Norton's theorem procedure: 1. Remove R L from the circuit. Search I N by shorting links output terminal. 2. Search R N by short-circuit voltage source or open-circuit

Sketch one full period of the am wave, Q. Let a(t) = [1 + m A x(t)] and x(t...

Q. Let a(t) = [1 + m A x(t)] and x(t) = cos 2πf m t, f m c , and x c (t) = A(t) cos 2πfct . (a) With m A =1, sketch one full period of the AM wave and draw the envelope by co

Determine the force applied to the plunger by system, Q. For the electromag...

Q. For the electromagnet shown in Figure, the λ-i relationship for the normalworking range is given by i = aλ 2 + bλ(x -d) 2 ,where a and b are constants. Determine the force app

Dot convention, polarity of dot convention

polarity of dot convention

Dc motors, i dont understand why equalizer connection is not used in wave w...

i dont understand why equalizer connection is not used in wave windings?

Determine downink of a cdma system, Consider the point-to-point radio link ...

Consider the point-to-point radio link introduced in problem 9. By how much must transmit power be increased to maintain the maximum BER of 10-5 if the channel is flat Rayleigh-fad

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages