| 摘要 |
This optical fiber comprises a central core, an intermediate cladding, a trench, and optical cladding. The central core has a refractive index difference ”n 1 relative to the optical cladding in the range 2.6×10 -3 to 3.5×10 -3 . The trench has a radius r 3 that is less than 24 µm. The refractive index difference ”n 3 of the trench relative to the optical cladding is in the range -15.0×10 -3 to -4.5×10 -3 at 633 nm. The volume V 13 of the trench, defined as follows: V 13 = 2 �¢ À . ˆ« r 2 r 3 ”n r �¢ rdr is in the range 170 %.µm 2 to 830 %.µm 2 . This fiber has an effective area greater than or equal to 150 µm 2 at a wavelength of 1550 nm and lower bending losses. Use in particular in long-haul terrestrial systems or undersea systems with or without repeaters. |
