摘要
We propose and demonstrate a scheme to measure the distribution of temperature along an optical fiber based on pseudo-random sequence modulation. In our experimental work, current modulation with a pseudo-random bit sequence （PRBS） is applied to a laser diode that serves as the Brillouin pump light and reference light. Because of the independence of the spatial resolution on the PRBS length~ the measurement range can be extended while maintaining high spatial resolution using a long PRBS length. Temperature-induced changes in a Brillouin frequency shift of 250 m fiber sections are clearly observed with 54 cm spatial resolution by this method.
We propose and demonstrate a scheme to measure the distribution of temperature along an optical fiber based on pseudo-random sequence modulation. In our experimental work, current modulation with a pseudo-random bit sequence （PRBS） is applied to a laser diode that serves as the Brillouin pump light and reference light. Because of the independence of the spatial resolution on the PRBS length~ the measurement range can be extended while maintaining high spatial resolution using a long PRBS length. Temperature-induced changes in a Brillouin frequency shift of 250 m fiber sections are clearly observed with 54 cm spatial resolution by this method.
基金
supported by the National Natural Science Foundation of China(Nos.61227016 and61377089)
the International Science and Technology Cooperation Program of China(No.2014DFA50870)
the National Science and Technology Infrastructure Program of the Ministry of Science and Technology of Shanxi Province,China(No.2013091021)
the Program for the Top Young Academic Leaders of Higher Learning Institutions of Shan Xi(No.2012lfjyt08)
