All-fiber inclinometers and displacement sensors using tunable Mach-Zehnder interferometers with an extinction ratio of >30.4 dB are produced by introducing two abrupt tapers in a short length < 1.4 cm of highly Er/Yb co-doped fiber. The abrupt tapers partially convert the core mode into cladding modes and interference occurs when the phase difference between the core and cladding modes accumulate to π after a certain propagation length. The maximal wavelength shift for the resonant transmission dips can reach 40.8 nm (from 1648 to 1607.2 nm) when the inclination angle, θ , varies from 0° to 32°. The wavelength shift can reach 26 nm (from 1404.4 to 1430.4 nm) when the compressive strain ε is 0.004.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering