Optical fiber, optical fiber module, and raman amplifier

Abstract

An optical fiber has a Raman gain efficiency with a pump power at 1450 nanometers of equal to or more than 4 m / W, and a ratio of a nonlinear parameter gamma at a wavelength of 1550 nanometers to the Raman gain efficiency with a pump power of 1450 nanometers is equal to or less than 3.

Description

technical field [0001] The invention relates to an optical fiber, an optical fiber module and a Raman amplifier suitable for high-speed optical communication. Background technique [0002] In recent years, a Raman amplifier can amplify in a desired wavelength bandwidth, and has attracted attention as an amplifier capable of achieving gain also in a wide wavelength region of 100 nm. The optical fiber used in the amplifying medium of this Raman amplifier is a quartz matrix, which is applicable to any optical fiber, but as a concentrated Raman amplifier, the Raman gain efficiency (GR / Aeff=Raman gain coefficient / effective Core cross-sectional area) 6.5 or more optical fiber, using about 500mW excitation light to obtain a gain of more than 20dB. [0003] However, although this existing optical fiber obtains an amplification of more than 20dB with an excitation light of about 500mW, it also produces a large nonlinear phase shift at the same time, and there is a problem that the c...

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Problems solved by technology

[0003] However, although this existing optical fiber obtains an amplification of more than 20dB with an excitation light of about 500mW, it also produces a large nonlinear phase shift at the same time, and there is a problem that the communication quality decreases due to the deterioration of the waveform of the signal light, which hinders high-speed optical communication. a major factor of

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