Abstract
A novel interrogation scheme for multiplexing the sensors based on long-period grating (LPG) Mach-Zehnder interferometers (MZIs) is proposed. Each LPG-MZI is formed by a pair of cascaded identical LPGs and induces an additional optical path difference (OPD) proportional to the centre-to-centre interval between the two LPGs. A sub-reflectogram including sensing information can be achieved when the OPD induced in one LPG-MZI is compensated by scanning one arm of a Michelson interferometer to a certain range. For multiple sensors, the grating intervals of different LPG-MZIs are set to different values to ensure that their sub-reflectograms can be well separated in time domain. The spectral response of the LPG-MZI is reconstructed from the corresponding sub-reflectogram with a fast Fourier transformation. Applications of the bending and temperature monitoring are demonstrated by measuring the signals in time domain and wavelength domain, respectively.
| Original language | English |
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| Title of host publication | Passive Components and Fiber-based Devices III |
| Volume | 6351 II |
| DOIs | |
| Publication status | Published - 27 Dec 2006 |
| Externally published | Yes |
| Event | Passive Components and Fiber-based Devices III - Gwangju, Korea, Republic of Duration: 5 Sept 2006 → 7 Sept 2006 |
Conference
| Conference | Passive Components and Fiber-based Devices III |
|---|---|
| Country/Territory | Korea, Republic of |
| City | Gwangju |
| Period | 5/09/06 → 7/09/06 |
Keywords
- Coherence multiplexing
- Interference intensity
- Long-period grating mach-zehnder interferometer
- Reconstructed spectra
- Scanning michelson interferometer
- Sub-refletcogram
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics