(b) A fiber optic link consists of two types of fibers, followed by an amplifier. The first fiber is 40 km long and its loss coefficient is 0.046 km". The second fiber is 60 km long and its loss coefficient is 0.072 km'. The splicing loss (to splice these fibers) is 0.5 dB. An amplifier of gain 22 dB is used after the second fiber. If the optical signal power at the end of the fiber optic link is -2 dBm, find the input optical signal power in dBm units.
Power Amplifier
The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.
Maximum Efficiency Criterion
In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.
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