Dual-Wavelength Differential Detection of FBGs Using a Frequency-Scanning Pulsed Laser

Article Optics

Correlation-based multiplexing of spectral channels and fiber-optic sensors using unmodulated continuous-wave distributed feedback diode lasers

Jorge H. Lopez et al.

Summary: In this Letter, a method for multiplexing spectral channels and fiber-optic sensors is demonstrated using correlation-based demultiplexing technique. The method utilizes the inherent phase noise of each light source as a fingerprint for recognition and demultiplexing, offering a simple implementation and suitability for budget-sensitive applications.

OPTICS LETTERS (2022)

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Article Engineering, Electrical & Electronic

Wavelength-Division Multiplexed Interrogation of FBGs Using a Distributed-Feedback Laser Array

Keiji Kuroda

Summary: This study reports the wavelength-division multiplexed interrogation of fiber Bragg gratings using a directly modulated distributed-feedback laser array as a multi-wavelength, frequency scanning, pulsed-light source. The heterodyne detection technique is employed to increase the signal-to-noise ratio of weak reflection signals. Reflections from three fiber Bragg gratings with different peak wavelengths are simultaneously observed as beat oscillations, with clear reflection spectra visible at a signal-to-noise ratio of approximately 20 dB.

IEEE PHOTONICS TECHNOLOGY LETTERS (2022)

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Article Chemistry, Analytical