ROC Fundamentals Practice Exam

In fiber-optic networks, the choice of wavelength for laser emission is crucial for achieving optimal signal amplification over long distances. The 1,550nm wavelength is particularly significant because it falls within the low-loss region of standard optical fibers, specifically silica fibers. At this wavelength, the attenuation of the signal is minimized, allowing the laser to propagate through the fiber with less signal degradation.

Additionally, the 1,550nm wavelength coincides with the operating range of erbium-doped fiber amplifiers (EDFAs), which are widely used for signal amplification in long-distance communication. These amplifiers effectively boost the signal strength at this wavelength without the need for electronic repeaters, making long-haul transmission more efficient and reducing costs.

While other wavelengths such as 850nm and 1,300nm do exist, they are not as effective for long-distance communication due to higher attenuation rates and increased dispersion, which can lead to signal loss over extended pathways. The 2,000nm wavelength is also impacted by significant attenuation in standard fibers and is not typically used for long-distance communications.

Thus, the 1,550nm wavelength is recognized as the optimal choice for enabling effective signal amplification in long-distance fiber-optic networks due to its favorable attenuation properties and