Instrumentation, Techniques, and Measurement

Field-programmable gate array-controlled sweep velocity-locked laser pulse generator

[+] Author Affiliations
Zhen Chen, Tao Wei

University of Rhode Island, Department of Electrical, Computer, and Biomedical Engineering, Kingston, Rhode Island, United States

Gerald Hefferman

University of Rhode Island, Department of Electrical, Computer, and Biomedical Engineering, Kingston, Rhode Island, United States

Brown University, Warren Alpert Medical School, Providence, Rhode Island, United States

Opt. Eng. 56(5), 054102 (May 03, 2017). doi:10.1117/1.OE.56.5.054102
History: Received February 10, 2017; Accepted April 17, 2017
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Abstract.  A field-programmable gate array (FPGA)-controlled sweep velocity-locked laser pulse generator (SV-LLPG) design based on an all-digital phase-locked loop (ADPLL) is proposed. A distributed feedback laser with modulated injection current was used as a swept-frequency laser source. An open-loop predistortion modulation waveform was calibrated using a feedback iteration method to initially improve frequency sweep linearity. An ADPLL control system was then implemented using an FPGA to lock the output of a Mach–Zehnder interferometer that was directly proportional to laser sweep velocity to an on-board system clock. Using this system, linearly chirped laser pulses with a sweep bandwidth of 111.16 GHz were demonstrated. Further testing evaluating the sensing utility of the system was conducted. In this test, the SV-LLPG served as the swept laser source of an optical frequency-domain reflectometry system used to interrogate a subterahertz range fiber structure (sub-THz-FS) array. A static strain test was then conducted and linear sensor results were observed.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Zhen Chen ; Gerald Hefferman and Tao Wei
"Field-programmable gate array-controlled sweep velocity-locked laser pulse generator", Opt. Eng. 56(5), 054102 (May 03, 2017). ; http://dx.doi.org/10.1117/1.OE.56.5.054102


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