3. The different wavelengths travel separately in the optical spectrum, the optical spectrum is measured in Giga Hertz (GHz). Currently 40, 80 or 160 optical channels separated from each other 100 GHz, 50 GHz or 25 GHz can be achieved on an optical fiber.

4. All this technology in the end gives us the ability to transmit 10 mbps (megabits per second), 100 mpbs, 1Gbps (gigabits per second), 100 Gpbs, 1Tbps (terabits per second) etc. These capabilities are those that finally interconnect cities, continents and that are used to transport the applications with which we live every day, such as WhatsApp, YouTube, Netflix, Twitch, etc.