Abstract
A novel interrogation method is presented in the application of strain sensing with a double taper Mach-Zehnder interferometer (DTMZI). The proposed sensing setup comprises a laser source and an optical power meter, which significantly lowers future integration cost and complexity. An analytical coupling model is established to study the sensor's strain-related modal behaviour. The design parameters of the DTMZI device are conditioned to satisfy a single-wavelength measurement. The spectral responses of several fabricated sensors are examined. Our experiments confirm the direct mapping between different strain values and particular transmission measures for the single wavelength case.
Highlights
F IBER taper sensors have been extensively studied in many sensing applications due to their low cost and fabrication complexity [1]
The versatility of abrupt tapers has shown their application in diverse configurations combined with other optical sensing devices such as Fiber Bragg Gratings (FBG) [6] and Long Period Gratings (LPG) [7]
The interrogation systems introduced in the strain sensing using double taper Mach-Zehnder Interferometer (DTMZI) includes a broadband source (BBS) as the light source and an optical spectrum analyzer (OSA) to record the spectral variances in the forms of wavelength shifts, which limits the practicality of these type of sensors
Summary
F IBER taper sensors have been extensively studied in many sensing applications due to their low cost and fabrication complexity [1]. The versatility of abrupt tapers has shown their application in diverse configurations combined with other optical sensing devices such as Fiber Bragg Gratings (FBG) [6] and Long Period Gratings (LPG) [7]. The interrogation systems introduced in the strain sensing using DTMZIs includes a broadband source (BBS) as the light source and an optical spectrum analyzer (OSA) to record the spectral variances in the forms of wavelength shifts, which limits the practicality of these type of sensors. We present a new interrogation method for DTMZI strain sensing using a monochromatic source and an optical power meter, avoiding the use of BBS and OSA. The assumption to allow the first-order linearity between the optical power and strain at the design wavelengths verifies our model’s validity
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