RAMAN GAIN EFFICIENCY DISTRIBUTION TESTING METHOD, AND RAMAN GAIN EFFICIENCY DISTRIBUTION TESTING DEVICE

摘要

The objective of the present invention is to provide a Raman gain efficiency distribution testing method and a Raman gain efficiency distribution testing device for measuring a Raman gain efficiency distribution of a fundamental mode and a first high-order mode in a multi-mode fiber. In a Raman gain efficiency distribution testing method and a Raman gain efficiency distribution testing device according to the present invention: the Raman gain coefficient of an optical fiber under test is calculated from the Raman gain coefficient of a pure silica core optical fiber at an excitation wavelength of 1 μm, the wavelength of exciting light, and a relative refractive index difference between the core and the cladding in an arbitrarily defined position z; an electric field distribution overlap integral is calculated at the arbitrarily defined position z between respective modes, for the mode field diameter of each mode at the wavelength of signal light, and the mode field diameter of each mode at the wavelength of the exciting light; the product of the Raman gain coefficient and the electric field distribution overlap integral is calculated; and the Raman gain efficiencies between respective modes for the signal light and the exciting light at the arbitrarily defined position z are acquired.