A device that reduces the intensity of light in optical fiber communications is . . . . . . . .

The correct answer is: B. Optical attenuator.

An optical attenuator is a device that reduces the intensity of light. It is used in optical fiber communications to control the power of the light signal. Optical attenuators can be made of a variety of materials, including glass, plastic, and metal. They are typically used in conjunction with optical amplifiers to ensure that the power of the light signal remains within a safe and acceptable range.

Option A, Compressor, is incorrect because a compressor is a device that reduces the volume of a gas or liquid.

Option C, Barometer,

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