A new method of reducing coherent Rayleigh noise (CRN) by using Phase Shift Keying (PSK) pulse coding is characterized and demonstrated theoretically and experimentally. A phase modulator driven by an arbitrary functi...
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A new method of reducing coherent Rayleigh noise (CRN) by using Phase Shift Keying (PSK) pulse coding is characterized and demonstrated theoretically and experimentally. A phase modulator driven by an arbitrary function generator is employed to encode pulses with PSK modulation, the traces obtained by coded pulses with different coding orders are superposed and averaged to reduce CRN. The experimental results validate that our method can realize about 0.49 dB amplitude fluctuation in 10 km optical fiber with 10 m spatial resolution when the coding length is 6bit. Compared with the method of FSAV, the method presented in this paper has almost the same CRN reduction effect at different spatial resolutions. From a practical point of view, the proposed method may be attractive in reducing the CRN for the Rayleigh scattering distributed optical fiber sensing system especially when the high spatial resolution and high accuracy are the main concerns.
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