On this day, 41 years ago, on May 21, 1984 (April 21, 1984, the world's first fiber-optic video telephone came into use. On May 21, 1984, the world's first video telephone using optical fiber communication network was officially launched in Biarritz, southwestern France. On this day, French President Mitterrand had a 10-minute conversation via video phone at the Elysee Palace with French Minister of Posts and Telecommunications Louis Mexando, who was in Biarritz. Mitterrand believes that this achievement is "the cutting edge of French electronics" and shows that France's communications industry has infinite possibilities. Optical fiber communication networks are the communication systems of the future. Because optical fiber has 10 times less resistance than coaxial cables, but its capacity is 10 units larger. Therefore, it can gradually replace traditional copper cables. Optical fiber communication networks can be used for video phones, television networks and access data and images. Biarritz optical fiber communication network is 10,000 kilometers long and worth approximately 600 million francs.