Device for enhancing sensitivity of distributed crosstalk measurement of optical polarizing device

Abstract

The invention provides a device for enhancing sensitivity of distributed crosstalk measurement of an optical polarizing device. By the device for enhancing the sensitivity of distributed crosstalk measurement of the optical polarizing device, signal to noise ratio of measurement signals is improved, sensitivity of polarizing crosstalk measurement is improved, a dynamic range of polarizing crosstalk measurement is expanded, and the polarizing performance of the optical device can be measured and analyzed precisely. The device for enhancing the sensitivity of distributed crosstalk measurement of the optical polarizing device comprises a broadband optical source, a polarizer, a polarizing device to be measured, a first optical fiber rotary connector, a second optical fiber rotary connector, an optical path demodulating and signal detecting device and a signal detecting and processing device. On the basis of measurement limitation of a single correlator, two branches of an optical path correlator measure synchronously, signal light which is transmitted to two polarizing spindles is separated by a polarization beam splitter, after being synchronously scanned, two channels of interference signals are stacked linearly, absolute strength of distributed crosstalk can be measured while signal to noise ratio of measurement is improved times, and the sensitivity and the accuracy of a measuring system are improved greatly.

Description

technical field [0001] The design of the invention belongs to the technical field of optical fiber measurement, and in particular relates to a device for enhancing the sensitivity of distributed crosstalk measurement of optical polarization devices. Background technique [0002] Polarization optical devices are an important part of high-precision optical measurement and sensing systems. At present, the performance testing and evaluation methods and devices of optical devices are backward, which seriously hinders the development of high-precision optical measurement and sensing systems. For example, the chip extinction ratio of lithium niobate integrated waveguide modulator (commonly known as Y waveguide), the core device of high-precision fiber optic gyroscope, has reached more than 80dB; The rate is around 50dB (according to the definition of energy, it is 10 5 ), the highest resolution is the Model 4810 polarization extinction ratio developed by dBm Optics of the United S...

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Problems solved by technology

However, none of the above devices have significantly improved the signal-to-noise ratio of the test system, and most of them are polarization-maintaining fibers, which will cause an increase in polarization crosstalk noise

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