The most common radiation sources are semiconductor light emitting diodes (LED - Light Emisson Diod) and laser diodes (LD - Laser Diod). The choice of a radiation source is determined by the requirements for the power of the emitter, its spectral and modulation characteristics, service life and operating temperature range. In both LEDs and laser diodes, the generation of light is due to the recombination of electrons and holes, which results in the production of photons. In fiber optics, only those of them are used that meet the requirements of the VOSPI: the radiation wavelengths must lie near the transparency windows of quartz OFs (0.85; 1.3 and 1.55 μm), the radiation power must be at least 1 μW, etc. etc.
Optical sources or visual fault locators are indispensable tools used by anyone working with optical cable.
With their help, you can fairly easily and quickly determine the place of damage to an optical cable.
When the optical fiber is strongly bent, the red radiation light will pass through the cable sheath, and in the event of a break, it will be visible at the point of damage.
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