In networks with data rates higher than what threshold are F-P lasers considered inadequate?

Ferrite-plated (F-P) lasers are often used in optical communication systems due to their cost-effectiveness and ease of manufacturing. However, they have limitations when it comes to high data rate applications. The transition to higher bandwidths in optical networks, specifically above 2.5 Gbps, leads to several performance issues with F-P lasers.

At data rates exceeding this threshold, factors such as modulation bandwidth, line width, and frequency response become critical. F-P lasers exhibit increased sensitivity to temperature changes and may struggle to maintain stable performance at higher bit rates. This can result in poorer signal quality, higher bit error rates, and reduced transmission distances.

In contrast, laser technologies like Distributed Feedback (DFB) lasers are more suited for these higher data rates as they can better handle the modulation requirements and are more stable across a range of operational conditions. Therefore, the criteria for considering F-P lasers inadequate at data rates higher than 2.5 Gbps is based on their inability to effectively manage the bandwidth and signal integrity needed for reliable communication in modern networks.