Abstract: Disclosed herein is a method comprising injecting light of a first wavelength ?1 into a wavelength division multiplexer; injecting light of a second wavelength ?2 into the wavelength division multiplexer; combining the light of the first wavelength ?1 and the light of the second wavelength ?2 in the wavelength division multiplexer to produce light of a third wavelength ?3; and reflecting the light of the third wavelength ?3 in a dual-Brillouin peak optical fiber that is in communication with the wavelength divisional multiplexer; wherein the dual-Brillouin peak optical fiber has at least two Brillouin peaks, such that an amplitude A1 of at least one of said Brillouin peaks is within 50% to 150% of an amplitude A2 of another Brillouin peak 0.5A2?A1?1.5A2; wherein the dual-Brillouin peak optical fiber generates a Brillouin dynamic grating that reflects an improved back-reflected Brillouin signal of the combined light.

Abstract: Disclosed herein is a method comprising injecting light of a first wavelength ?1 into a wavelength division multiplexer; injecting light of a second wavelength ?2 into the wavelength division multiplexer; combining the light of the first wavelength ?1 and the light of the second wavelength ?2 in the wavelength division multiplexer to produce light of a third wavelength ?3; and reflecting the light of the third wavelength ?3 in a dual-Brillouin peak optical fiber that is in communication with the wavelength divisional multiplexer; wherein the dual-Brillouin peak optical fiber has at least two Brillouin peaks, such that an amplitude A1 of at least one of said Brillouin peaks is within 50% to 150% of an amplitude A2 of another Brillouin peak 0.5A2?A1?1.5A2; wherein the dual-Brillouin peak optical fiber generates a Brillouin dynamic grating that reflects an improved back-reflected Brillouin signal of the combined light.