STIMULATED RAMAN-SCATTERING MODES IN HIGHLY ELLIPTIC-CORE OPTICAL-FIBER

Stimulated Raman scattering (SRS) transmission modes in highly ellipti cal-core optical fiber of three different structures are experimentall y researched. The measuring setup, SRS spectrum and photographs of Sto kes modes are given. The observed phenomena are completely different f rom those on circular-core graded-index optical fiber. The beam sizes of SRS remain constant and SRS light transmits with the characteristic s of higher-order mode. In addition, the experimental results are theo retically explained with fiberoptical dispersion theory and SRS phase matching conditions.