Lasers used in communication system are usually

Ruby lasers

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He-Ne laser

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C O_{2}

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Semiconductor

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Solution

The correct option is C Semiconductor
Semiconductor lasers have the potential to meet demands for next-generation high-speed communication networks. Their low cost, wide tunability, low power consumption, and very good spectral response make them ideal transmission sources.

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{C O}_{2}

Which one of the following lasers are used in Laser Printers?

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