RCDD Certification Practice Exam 2025 – Your Complete All-in-One Guide to Success!

The selection of 700 nm as the answer is grounded in the typical nominal wavelengths utilized for laser light sources in fiber optic communications. Wavelengths of 850 nm, 1300 nm, and 1550 nm are commonly used in multimode and single-mode fiber optics due to their efficiency in transmission and lower attenuation characteristics in glass fiber.

Wavelengths around 850 nm are standard for short-range multimode fiber applications, primarily in local area networks. The 1300 nm wavelength has been a traditional choice for long-distance multimode fiber and provides a good balance of performance. The 1550 nm wavelength is widely used in single-mode fibers, especially for long-haul telecommunication applications, because it offers the lowest attenuation and the capacity for higher data rates.

In contrast, 700 nm does not fall within the commonly used nominal wavelengths for laser light in fiber optics. While 700 nm can be used in some other contexts, such as low-cost devices or specific applications not typically related to long-distance communication, it is not standard for the mainstream fiber optics technologies that employ the other three wavelengths. Thus, it is identified as the option that does not represent a nominal wavelength for conventional laser light sources in fiber optic systems.