| 摘要 |
PROBLEM TO BE SOLVED: To realize economization by sharing a light source. SOLUTION: A speed meter comprises a plurality of optical fiber ring resonators 4i connected in series through optical fiber couplers 5i (i=x, y, z), a laser light source 1 for supplying pumping light of two luminous flux reversely from the opposite ends of the series connection circuit, a light branching/ coupling means 11i for taking out and combining induction Brillouin scattering light of opposite circulations oscillated at each optical fiber ring resonators 4i, and a light receiving unit 6i for detecting the beat of a combined light.
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