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Investigation of Axial Strain Effects on Microwave Signals from a PM-EDF Short Cavity DBR Laser for Sensing Applications

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6 Author(s)
Jiang, M.$^{1}$OPTIMUS, School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore, ; Dinh, X.Q. ; Shum, P.P. ; Molin, S.
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The effects of axial strain on beating frequency from a short cavity polarization-maintaining erbium-doped fiber (PM-EDF) based distributed Bragg reflector (DBR) laser were investigated theoretically and experimentally for the first time. This type of single-mode DBR fiber laser based ultrasensitive sensor has been extensively developed for measuring kinds of measurands, but the cross-sensitivity of axial strain was usually ignored. A DBR fiber laser with an effective cavity length of \sim 1 cm formed by a pair of FBGs written on a PM-EDF was fabricated for demonstration. This laser operated in dual-polarization single-longitudinal mode stably. The frequency of the beating signal generated by two orthogonal polarizations was found to be proportional to the axial strain applied on the cavity. A linear strain sensitivity of 0.640 \hbox {GHz/m}\varepsilon was obtained, with a fiber birefringence of around 8.65e-5. For the fiber with larger birefringence, the sensitivity to the axial strain will be increased. So the effects of axial strain should be considered when the structure is utilized as a high-resolution sensor, especially for a polarization-maintaining system. The single-mode DBR laser made of high birefringent fibers also has a potential application in frequency tunable microwave generation.

Published in:

Photonics Journal, IEEE  (Volume:4 ,  Issue: 5 )