PXA-1000 Distributed Polarization Crosstalk Analyzer – PolaX™
■The Distributed Polarization Crosstalk (X-Talk) Analyzer (PXA-1000) is a white light interferometer designed to obtain space-resolved stress information by analyzing stress-induced polarization cross-coupling along a length of polarization maintaining (PM) fiber. Its unique optical design eliminates the strong zero-order interference and reduces the multi-coupling interference common in traditional white light interferometers; as a result, the PXA-1000 has higher measurement sensitivity, higher dynamic range, and higher spatial measurement accuracy than traditional white light interferometers. The PXA-1000 enables the use of the PM fiber itself as the sensing medium, eliminating the need to place multiple fiber gratings along the fiber. It can therefore obtain higher spatial resolution of the stress distribution than grating-based systems. Because no discrete sensing elements are required, the system is easy to install and calibrate, making it ideal for monitoring space-resolved structural changes along bridges, tunnels, dams, oil pipes, or buildings. It can also be used as an intrusion detection system, because any mechanical disturbances to the PM fiber will cause polarization coupling. Another important application is PM fiber quality inspection. The PXA-1000 easily identifies defective sections of PM fiber, enabling the manufacturers or users to remove them. Furthermore, the PXA-1000 is ideal for quality inspection and screening of PM fiber coils, since it can pinpoint the locations of imperfections or areas of local stress on the fiber coil induced during the fiber winding process. The software displays the location and polarization coupling ratio of each stress point as a function of distance. It also generates a table listing the locations and polarization coupling strengths of all crosstalk peaks above a user-defined threshold. Other applications of the instrument includes measuring the extremely high polarization extinction ratio of a polarizing waveguide, obtaining the autocorrelation function of a light source, measuring the birefringence of a PM fiber and the lengths of PM and SM fibers, and matching the optical path lengths of an interferometer.
■ More detailed information on measurement principles is provided in section 3.
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[ measuring the extremely high polarization extinction ratio of a polarizing waveguide ][ obtaining the autocorrelation function of a light source ][ measuring the birefringence of a PM fiber ][ the lengths of PM fiber ][ the lengths of SM fiber ][ matching the optical path lengths of an interferomete ][ intrusion detection system ][ monitoring bridge ][ monitoring tunnels ][ monitoring dams ][ monitoring oil pipes ][ monitoring buildings ] |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2019/8/31 |
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3.6 MB |
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