Compare LEDs with injection laser in respect of its advantages and disadvantages in optical fiber communication?

LEDs (light-emitting diodes) and injection lasers both serve as light sources in optical fiber communication but have distinct advantages and disadvantages. LEDs are generally less expensive, have a longer lifespan, and offer a broader spectral output, making them suitable for short-distance applications. However, they provide lower optical power and slower modulation speeds compared to injection lasers, which can generate higher power and operate at faster data rates, making them ideal for long-distance communications. The downside of injection lasers is their higher cost and shorter lifespan due to thermal effects.