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In optical fiber communication, dark current is primarily considered as noise. Dark current refers to the small amount of electric current that flows through a photodetector, like a photodiode, even when there is no incident light. This current can lead to noise in the system, reducing the signal-to-noise ratio and thereby affecting the overall performance of the communication system.

When a photodetector is used to convert light signals into electrical signals, the presence of dark current may lead to erroneous readings and decreased sensitivity, which means that it can mask the actual signals being transmitted. Therefore, it is crucial to manage dark current to improve the reliability and efficiency of optical fiber communication systems.