Fast Frame Synchronization Design and FPGA Implementation in SF-BOTDA

To address the issues of high time consumption of frame synchronization involved in a scanning-free Brillouin optical time-domain analysis (SF-BOTDA) system, a fast frame synchronization algorithm based on incremental updating was proposed. In comparison to the standard frame synchronization algorithm, the proposed one significantly reduced the processing time required for the BOTDA system frame synchronization by about 98%. In addition, to further accelerate the real-time performance of frame synchronization, a field programmable gate array (FPGA) hardware implementation architecture based on parallel processing and pipelining mechanisms was also proposed. Compared with the software implementation, it further raised the processing speed by 13.41 times. The proposed approach could lay a foundation for the BOTDA system in the field with the associated high real-time requirements.

[1]  Matthew S. Hoehler,et al.  Temperature measurement and damage detection in concrete beams exposed to fire using PPP-BOTDA based fiber optic sensors , 2017, Smart materials & structures.

[2]  M. Tur,et al.  High spatial resolution distributed sensing in optical fibers by Brillouin gain-profile tracing. , 2010, Optics express.

[3]  Yongkang Dong,et al.  Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement , 2018, Light: Science & Applications.

[4]  Suzhen Li,et al.  Experimental and numerical investigation on temperature measurement of BOTDA due to drop leakage in soil , 2016 .

[5]  Hwa-Yaw Tam,et al.  Single-measurement digital optical frequency comb based phase-detection Brillouin optical time domain analyzer. , 2017, Optics express.

[6]  M. Tur,et al.  Slope-assisted fast distributed sensing in optical fibers with arbitrary Brillouin profile. , 2011, Optics express.

[7]  Dexin Ba,et al.  Distributed measurement of dynamic strain based on multi-slope assisted fast BOTDA. , 2016, Optics express.

[8]  Changyuan Yu,et al.  Scanning-free BOTDA based on ultra-fine digital optical frequency comb. , 2015, Optics express.

[9]  Bijan Alizadeh,et al.  FPGA-Based Implementation of a Novel Method for Estimating the Brillouin Frequency Shift in BOTDA and BOTDR Sensors , 2018, IEEE Sensors Journal.

[10]  William Shieh,et al.  Single-shot distributed Brillouin optical time domain analyzer. , 2017, Optics express.

[11]  T. Horiguchi,et al.  Distributed-temperature sensing using stimulated Brillouin scattering in optical silica fibers. , 1990, Optics letters.

[12]  Moshe Tur,et al.  Frequency-Scanning BOTDA With Ultimately Fast Acquisition Speed , 2015, IEEE Photonics Technology Letters.

[13]  Bijan Alizadeh,et al.  FPGA-Based Implementation of an Artificial Neural Network for Measurement Acceleration in BOTDA Sensors , 2019, IEEE Transactions on Instrumentation and Measurement.

[14]  Dexin Ba,et al.  Detecting cm-scale hot spot over 24-km-long single-mode fiber by using differential pulse pair BOTDA based on double-peak spectrum. , 2017, Optics express.

[15]  T. Horiguchi,et al.  Optical-fiber-attenuation investigation using stimulated Brillouin scattering between a pulse and a continuous wave. , 1989, Optics letters.

[16]  Hui Li,et al.  High-Spatial-Resolution Fast BOTDA for Dynamic Strain Measurement Based on Differential Double-Pulse and Second-Order Sideband of Modulation , 2013, IEEE Photonics Journal.

[17]  Chiu-Sing Choy,et al.  BOTDA Fiber Sensor System Based on FPGA Accelerated Support Vector Regression , 2018, IEEE Transactions on Instrumentation and Measurement.