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AssigneeKokusai Denshin Denwa Kabushiki Kaisha
InventorsHiroharu Wakabayashi, Yasuhiko Niiro
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An optical loss in a single mode optical device is measured by utilizing multi-mode equipment. The present system comprises of an optical source (1), a sample (30) to be tested, a reference optical attenuator (31) for replacing the optical loss in the sample (30), a first optical switch (40) provided between the optical source (1) and the sample (30) through a single mode optical fiber, a second optical switch (41) provided between the sample (30) and the light receiver (2) through the multi-mode optical fiber, said reference optical attenuator (31) being provided between the first optical switch (40) and the second optical switch (41) so that the optical path is switched either to the sample (30) or to the reference attenuator (31), the optical fiber between the sample (30) and the second optical switch (41) and the optical fiber connected to the input and the output of the reference attenuator (31) being a multi-mode optical fiber.
A system for measuring an optical loss in a single mode optical fiber comprising an optical source (1), a sample (30) to be tested, a reference attenuator (31) for replacing the optical loss in the sample (30), a first switch (40) provided between the optical source (1) and the sample (30) through a single mode optical fiber, a second optical switch (41) provided between the sample (30) and the light receiver (2) through an optical fiber, and at least the optical fiber between the sample (30) and the second switch (41) and the optical fiber between the second switch (41) and the light receiver (2) having a larger numerical aperture than that of the sample to be tested.
Dependencies are inferred from the claim text.