This paper presents a novel method for characterization of gain spectrum of stimulated Mandelstam-Brillouin scattering (SMBS) in single-mode optical fiber. This method is based on the usage of double-frequency probing radiation. For conversion of the complex SBS spectrum from optical to the electrical field single-sideband modulation is used. Detection of double-frequency components position in the gain spectrum occurs through the amplitude modulation index of the envelope and the phase difference between envelopes of probing and passing components.

This paper presents novel methods for multiple frequency characterization of stimulated Mandelstam-Brillouin gain spectrum (SMBGS) in single-mode optical fiber. This method is based on the usage of multiple frequencies probing radiation. For conversion of the complex SMBGS from optical to the electrical field single-sideband modulation, direct or heterodyne detection are used. Determining of a multiple frequencies positions over the gain spectrum occurs through the amplitude modulation index of the envelope or the phase difference between envelopes of probing and passing components.

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