Certified Fiber Optics Practice Exam

What range of light is typically used by Light Emitting Diodes and lasers for diagnostics and troubleshooting?

1. 620-635

2. 635-650

3. 650-675

4. 675-700

The correct answer is: 635-650

Light Emitting Diodes (LEDs) and lasers typically operate within the range of 635-650 nanometers for diagnostics and troubleshooting. This wavelength range falls within the red spectrum of light, which is often used in fiber optics because it strikes a balance between visibility and penetration in fiber materials. Using light in this range allows for effective testing, as it is bright enough to be easily detected but not so high in energy that it would cause damage to the fiber or the equipment. The choice of 635-650 nanometers facilitates optimal coupling into the fiber and provides sufficient signal strength for accurate diagnostics. This range ensures reliable performance during troubleshooting and maintenance of fiber optic systems. The other ranges provided, while they may encompass usable wavelengths, either fall outside the optimal range for fiber diagnostics or are less common in practical applications due to lower effectiveness for those specific tasks. Thus, the selected range is well-suited for the diagnostics and troubleshooting of fiber optic systems.