Why you used 1550 and 1310 wavelength in telecom?

The 1550 nm and 1310 nm wavelengths are commonly used in telecommunications because they align with the low-loss Windows of optical fibers, allowing for efficient long-distance signal transmission. The 1550 nm wavelength, in particular, offers lower attenuation and is ideal for long-haul applications, while 1310 nm is often used for shorter distances due to its lower dispersion. Both wavelengths are compatible with existing fiber optic technologies and support high bandwidth, making them optimal choices for various communication systems.