Optical fiber and method for manufacturing same

Abstract

An optical fiber (1) provided with a depressed layer (112) interposed between a core (111) and a cladding layer (113), wherein the effective core cross-section area Aeff is set to 100 [mu]m<2> to 129[mu]m<2>, the radius r1 of the core (111) is set to 5.2-7.4 [mu]m, the refractive index volume Vcore of the core (111) is set to 8.5 % [mu]m<2> to 16.5 %[mu]m<2>, and the refractive index volume Vdepof the depressed layer (112) is set to -40 % [mu]m<2> to below 0 [mu]m<2>.

Description

technical field [0001] The invention relates to an optical fiber with a depressed layer. In addition, it relates to a method of manufacturing such an optical fiber. Background technique [0002] In order to realize an optical communication system capable of long-distance transmission, it is important to increase the power of an optical signal, reduce the transmission loss of an optical fiber as a transmission medium, and improve the optical signal-to-noise ratio. However, if the power of the optical signal is increased, the optical signal-to-noise ratio deteriorates due to the nonlinear optical effect of the optical fiber. Therefore, a method of suppressing nonlinear optical effects by enlarging the effective core cross-sectional area Aeff of an optical fiber is often employed. [0003] However, an increase in the effective core cross-sectional area Aeff is accompanied by an increase in microbend loss as a side effect. Therefore, in the optical fiber for long-distance tra...

AI Technical Summary

Problems solved by technology

[0006] However, it is difficult to suppress the microbending loss of the optical fiber to a level that can withstand long-distance transmission only by optimizing the Young's modulus and thickness of the coating layer according to Patent Document 1.

For example, for optical fibers accommodated in ribbon jack cables, the microbend loss cannot be suppressed to a level that can withstand long-distance transmission

Images