Optical communication using fibers is performed in the frequency range of:

Question

Question

Answer 1

CONCEPT:

The bandwidth of Transmission Medium:

Similar to message signals, different types of transmission media offer different bandwidths.
The commonly used transmission media are wire, free space, and fiber optic cable.
Coaxial cable is a widely used wire medium, which offers a bandwidth of approximately 750 MHz.
Such cables are normally operated below 18 GHz.
Communication through free space using radio waves takes place over a very wide range of frequencies: from a few hundreds of kHz to a few GHz.
This range of frequencies is further subdivided and allocated for various services as indicated in the given table.
Optical communication using fibers is performed in the frequency range of 1 THz to 1000 THz (microwaves to ultraviolet). An optical fiber can offer a transmission bandwidth in excess of 100 GHz.
Spectrum allocations are arrived at by an international agreement. The International Telecommunication Union (ITU) administers the present system of frequency allocations.

Service	Frequency bands	Comments
Standard AM broadcast	540-1600 kHz
FM broadcast	88-108 MHz
Television	54-72 MHz 76-88 MHz 174-216 MHz 420-890 MHz	VHF (very high frequencies) TV UHF (ultra-high frequencies) TV
Cellular Mobile Radio	896-901 MHz 840-935 MHz	Mobile to the base station Base station to mobile
Satellite Communication	5.925-6.425 GHz 3.7-4.2 GHz	Uplink Downlink

EXPLANATION:

Optical communication using fibers is performed in the frequency range of 1 THz to 1000 THz (microwaves to ultraviolet). Hence, option 3 is correct.