Optical fiber, optical fiber module, and raman amplifier

Abstract

The object of the present invention is to provide an optical fiber, an optical fiber module and a Raman amplifier capable of obtaining sufficient Raman amplification while suppressing nonlinear phase shift. The ratio of the Raman gain coefficient GR to the effective core cross-sectional area Aeff of the optical fiber (2a) for amplification, that is, the Raman gain efficiency (GR / Aeff) is more than 4 (m / W), and the nonlinear parameter γ is more than 4 (m / W) to the Raman gain efficiency ( The ratio of GR / Aeff) is 3 or less.

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 than 6.5 fibers, with about 500mW of excitation light to obtain a gain of 20dB or more. [0003] However, although this existing optical fiber obtains an amplification of 20dB or more 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 20dB or more 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 the high-speed optical fiber. a major factor in communication

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