Single-mode optical fiber and optical system

Abstract

The invention relates to a single-mode optical fiber and an optical system, the single-mode 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 2.610 -3 to 3.510 -3 . The trench has a radius r 3 that is less than 24 [mu]m. The refractive index difference n 3 of the trench relative to the optical cladding is in the range -15.010 -3 to -4.510 -3 at 633 nm. The volume V 13 of the trench, defined as follows: V 13 is in the range 170 %.[mu]m 2 to 830 %.[mu]m 2 . This fiber has an effective area greater than or equal to 150 [mu]m 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.

Description

technical field [0001] The invention relates to the field of optical fiber transmission, more specifically, to an optical fiber with increased effective area but no increased bending loss and a corresponding optical system. Background technique [0002] Generally speaking, in the field of optical fibers, the concept of effective area is introduced in order to calculate nonlinear effects. The effective area generally corresponds to the usable section of a fiber defined based on the distribution of modes propagated in the fiber's field. [0003] By way of non-limiting example, the effective area Aeff is defined as follows: [0004] Aeff = 2 π ( ∫ 0 ∞ | F ( r ) ...

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Problems solved by technology

[0020] Therefore, the question that arises is: how to increase the effective area Aeff to more than 150 μm 2 , without substantially increasing manufacturing costs and without compromising performance in terms of bend loss

[0040] Thus, the prior art d

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