Optical wavelength filters with large tuning range and narrow bandwidth are crucial for enhancing the capability of WDM communication systems. A polymeric tunable filter for C-band, comprising a tilted Bragg grating and a mode sorting waveguide junction is proposed in this work. For dropping a certain wavelength signal, the tilted Bragg grating reflects an odd mode into an even mode and then the reflected even mode propagates towards an output port of the asymmetric Y-junction due to the mode sorting. Consequently, the output port is separated from the input port, which is not possible in an ordinary Bragg reflector. The tilted Bragg reflector with an odd-even mode coupling efficiency of 61% exhibited a maximum reflectivity of 95% for a grating of 6 mm. A linear wavelength tuning of over 10 nm was achieved for an applied thermal power of 312 mW.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.24.005709 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
In this Letter, we propose a new method utilizing femtosecond laser direct writing technology to rapidly inscribe high-quality tilted fiber Bragg gratings (TFBGs) in multicore fibers (MCFs). A series of TFBGs with varying tilt angles were directly inscribed in MCFs using the Plane-by-Plane (Pl-by-Pl) method, and the writing time for a 4 mm long TFBG was only 3.60 s.
View Article and Find Full Text PDFArticle Synopsis
- Fiber optic sensors can now detect a battery's state of charge (SOC) and electromotive force (EMF) in real-time, but understanding the link between the sensor's spectral changes and internal EMF changes is challenging.
- The proposed method uses a tiny tilted fiber Bragg grating (TFBG) sensor to monitor electrolyte levels during battery discharge, effectively correlating the fiber optic transmission spectrum with battery EMF.
- The results indicate that using a TFBG sensor in lead-acid batteries allows for quick EMF detection, showcasing its potential for improving battery performance monitoring and failure detection.
Temperature and Lateral Pressure Sensing Using a Sagnac Sensor Based on Cascaded Tilted Grating and Polarization-Maintaining Fibers.
Sensors (Basel)
October 2024
Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
This study introduces a Sagnac Interferometer (SI) fiber sensor that integrates Polarization-Maintaining Fibers (PMFs) with a Tilted Fiber Bragg Grating (TFBG) for the dual-parameter measurement of strain and lateral pressure. By incorporating a 6° TFBG with PMFs into the SI sensor, its sensitivity is significantly enhanced, enabling advanced multi-parameter sensing capabilities. The sensor demonstrates a temperature sensitivity of -1.
View Article and Find Full Text PDFA humidity sensor for respiratory monitoring based on a tilted fiber Bragg grating (TFBG) functionalized with a nanoporous coating consisting of titanium carbide (TiC) and fullerene (C) is proposed. By incorporating the C into TiC, a nanocomposite film with abundant three-dimensional porousness is coated on the TFBG surface. The nanocomposite film with strong hygroscopicity and desorption properties is highly sensitive to environmental humidity variations, where the induced refractive index changes of the coating result in the spectral responses of TFBG multi-resonances.
View Article and Find Full Text PDFHydrogel binding sodium alginate based optical fiber surface plasmon resonance for calcium ion trace detection.
Anal Chim Acta
August 2024
College of Optical and Electronic Technology, China Jiliang University, Hangzhou, Zhejiang, 310018, China. Electronic address:
Article Synopsis
- A plasmonic tilted fiber Bragg grating (TFBG)-based sensor was developed for detecting calcium ions (Ca) using a specialized hydrogel material made from cellulose nanocrystals and polyvinyl alcohol, enhanced with sodium alginate.
- The hydrogel composite was coated onto a gold-coated TFBG, improving the sensor’s ability to detect small changes in refractive index due to varying Ca concentrations.
- The sensor achieved a remarkable limit of detection of about 0.025 fM, making it significantly more sensitive than existing calcium sensors, with an effective detection range spanning from 10 M to 10 M.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!