Method for measuring polarization characteristics of optical fiber, drawing method, method for identifying abnormal point, and method for configuring optical fiber transmission line
AssigneeSumitomo Electric Industries, Ltd.
InventorsYoshinori Yamamoto, Eisuke Sasaoka
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Abstract
The present invention relates to a measuring method, etc., comprising a structure for accurately measuring optical characteristics such as PMD of an optical fiber. The measuring method is a technique for measuring polarization characteristic distributions along the longitudinal direction of the optical fiber as a measuring object by using BOCDA, and by propagating probe light and pumping light opposite in the optical fiber, BGS is generated at a plurality of respective measurement positions. Then, based on Brillouin gain fluctuations at the respective measurement positions, polarization characteristic distributions are calculated.
Claims8
A polarization mode dispersion (PMD) characteristic measuring method of measuring PMD characteristic distributions along a longitudinal direction of an optical fiber as an object to be measured by using Brillouin Optical Correlation Domain Analysis (BOCDA), the method comprising steps of:
- making probe light incident from one end of the optical fiber and making pumping light incident from the other end of the optical fiber;
- measuring a Brillouin gain spectrum at respective measurement positions along the longitudinal direction of the optical fiber as a gain to be given to the probe light due to Brillouin scattering generated by propagation of the pumping light inside the optical fiber;
- and
- calculating PMD characteristic distributions along the longitudinal direction of the optical fiber based on Brillouin gain fluctuation periods along the longitudinal direction of the optical fiber.
Dependencies are inferred from the claim text.