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The function of the 2 kHz modulation when testing fibers with a laser light source is primarily to provide a test signal that allows the fiber under test to be detected by an optical fiber identifier. This modulation creates a distinct signal that can be recognized by identification equipment, making it easier to differentiate the fibers being tested and to isolate them accurately for analysis. By superimposing this modulation onto the laser light, technicians can ensure that they are working with the correct fiber and receiving consistent feedback about its performance.

The modulation does not primarily serve to stabilize the power output of the laser, enhance the brightness of the laser beam, or reduce the risk of overheating the fiber. While stabilizing power output may be a characteristic of certain laser technologies, it is not the main purpose of 2 kHz modulation in this context. Enhancing brightness is not related to modulation, as the laser's intrinsic brightness depends on its design rather than on modulation frequency. Finally, modulation does not alleviate the risk of overheating, which is typically managed through the careful control of laser settings and operational protocols.