Question

A local Broadband Internet Supplier is transmitting high speed internet over a distance of 50 km (31 miles) to a neigboring hub using a 10 Watt laser transmitter over single mode fiber optic cables. Calculate whether the incoming signal strength at the receiver and determine whether the desired data rate will be adequate given the following Power Budget Parameters: (e.g- page 761)

a) Output Power of the transmitter is 10 W
b) Light sensitivity of the receiver is 60 W
c) Cable length is 50 km
d) Cable attencation is 0.7 dB/km
e) There are 15 connectors with 0.6 dB attenuation each
f) Laser Transmiter to fiber optic connection loss is 1.1 dB
g) Fiber optic connection to receiver loss is 1.5 dB
h) Contingency loss is allocated at 6db
i) Cable dispersion is 35ps/km
j) Desired customer internet data rate is 100Mbps
1) Calculate the total transmission losses in dB :

Answer 1

To calculate the total transmission losses in dB, we consider the cable attenuation, connector attenuation, connection loss, contingency loss, and cable dispersion losses.

Step-by-step explanation:

To calculate the total transmission losses in dB, we need to consider the various parameters given in the question. Firstly, the total cable attenuation can be calculated by multiplying the cable length (50 km) by the cable attenuation per kilometer (0.7 dB/km). This gives us a total cable attenuation of 35 dB. Next, we need to account for the attenuation caused by the connectors. Since there are 15 connectors, we multiply the connector attenuation (0.6 dB) by the number of connectors to get a total connector attenuation of 9 dB. We then add the attenuation due to the transmitter to fiber optic connection (1.1 dB) and the fiber optic connection to receiver (1.5 dB) to get a total connection loss of 2.6 dB. Finally, we add the contingency loss (6 dB) and the cable dispersion loss (35 ps/km) multiplied by the cable length to get the total transmission losses.