Chapter 20: Problem 2758

In optical fiber communication, the APD semi conductor device is used (A) to convert radio signal into optical signal. (B) to obtain intensity modulated signal (C) to covert optical signal into electrical signal (D) to covert optical signal into radio signal.

Short Answer

Expert verified

The correct answer is Option (C): APD semiconductor devices are used in optical fiber communication systems to convert optical signals into electrical signals.

Step by step solution

Avalanche photodiodes (APD) are highly sensitive semiconductor devices that are used in optical fiber communication systems. They operate by converting light signals (optical signals) into electrical signals, essentially acting as photodetectors. In optical communication systems, the optical signals are typically weak, so these APDs are employed due to their high sensitivity and ability to amplify the signal. #Step 2: Analyzing Option (A)#

Option (A) states that an APD is used to convert radio signals into optical signals. This is incorrect because the primary function of an APD is to convert optical signals into electrical signals, not to convert radio signals into optical signals. #Step 3: Analyzing Option (B)#

Option (B) says that an APD is used for obtaining intensity modulated signals. While intensity modulation is a technique used in optical communication, it is not the main function of an APD. The purpose of the APD is to convert optical signals into electrical signals. Hence, option (B) is not the correct answer. #Step 4: Analyzing Option (C)#

Option (C) claims that an APD is used to convert optical signals into electrical signals. This statement correctly describes the primary function of an APD in optical fiber communication systems. APDs act as photodetectors, converting the weak optical signals into electrical signals that can be further processed and analyzed by the communication system. #Step 5: Analyzing Option (D)#

Option (D) asserts that an APD is used to convert optical signals into radio signals. This is an incorrect statement because the primary function of an APD is to convert optical signals into electrical signals, not to convert optical signals into radio signals. #Conclusion#

Based on our analysis of the given options, we can conclude that the correct answer is Option (C): APD semiconductor devices are used in optical fiber communication systems to convert optical signals into electrical signals.

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In optical fiber communication, the APD semi conductor device is used (A) to convert radio signal into optical signal. (B) to obtain intensity modulated signal (C) to covert optical signal into electrical signal (D) to covert optical signal into radio signal.

Short Answer

Step by step solution

Option (D) asserts that an APD is used to convert optical signals into radio signals. This is an incorrect statement because the primary function of an APD is to convert optical signals into electrical signals, not to convert optical signals into radio signals. #Conclusion#

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