Time-division-multiplexing scheme of the folded Sagnac sensor array with active phase bias

被引：0

作者：

Song, Zhangqi ^{[1
]}

Yang, Mingye ^{[1
]}

Zhang, Xueliang ^{[1
]}

Wang, Xin ^{[1
]}

Hu, Yongming ^{[1
]}

机构：

[1] College of Opto-Electronic Science and Engineering, National University of Defense Technology

来源：

Guangxue Xuebao/Acta Optica Sinica | 2008年 / 28卷 / 03期

关键词：

Fiber optics; Sagnac interferometer; Sensor array; Time division multiplexing;

D O I：

10.3788/AOS20082803.0560

中图分类号：

学科分类号：

摘要：

To avoid the overlapping of signal and noise pulses in the folded Sagnac fiber sensor array (FSSA). a time-division-multiplexing (TDM) scheme with active phase bias is proposed. Noise pulses and signal pulses are controlled to return alternately, just by adjusting the length of the bus fiber of traditional sensor array with ladder structure and adding a section of delay fiber at one end of the Sagnac interferometer. Analysis shows the input pulse repetition rate can reach half of the standard TDM scheme when the length of the delay coil is appropriate. The phase bias of the sensor array is realized through an integrated optical chip (IOC) driven by a pulse signal synchronizing with the input optical pulse. A two-sensor-array with this structure is demonstrated experimentally, and the input optical pulse repetition is rate 754.727 kHz. The phase sensitivity is about 7.3 μrad/√Hz at 5 kHz, and the crosstalk between two sensors is measured to be about -51.75 dB.

引用

页码：560 / 564

页数：4

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