GRADED-INDEX OPTICAL FIBER FOR HIGH BIT-RATE AND LOCAL AREA NETWORK, ESPECIALLY SATISFYING TRANSMISSION CHARACTERISTICS REQUIRED FOR PLURALITY OF WAVELENGTHS

摘要

PURPOSE: A graded-index optical fiber for a high bit-rate and a local area network is provided to supply the transmission rate larger than 1 giga bit by having the mode delay difference. CONSTITUTION: A graded-index optical fiber(300) for a high bit-rate and a local area network includes a core(310) and a clad(320). The core has a graded index refraction distribution. The clad encompasses the core to trap the light inside of the core. The wave mode delay differences of 1300nm ¯ 85nm wavelengths are wholly increased in the core. And, the graded-index optical fiber is characterized in that the wave mode delay differences between both waves within 0.6 ns/km to the radius corresponding to 50% of the core radius.