研究目的
To design and analyze a tunable filter based on fiber Bragg grating using thermal technique for wavelength shifting in optical communication bands.
研究成果
The FBG-based tunable filter using thermal technique is effective for small wavelength shifts in C and L bands, with experimental results matching theoretical predictions. It offers a simple and cost-effective method for tuning, but has limitations in range and speed. Future work could explore hybrid tuning methods or improved materials.
研究不足
The tuning range is limited to about 1.5-1.6 nm, which may not be sufficient for some applications. The method relies on thermal effects, which can have slow response times and may not be suitable for rapid tuning. Optimization could involve using materials with higher thermo-optic coefficients or alternative tuning mechanisms.
1：Experimental Design and Method Selection:
The study involves theoretical modeling of the FBG tunable filter using thermal effects and experimental validation. The theoretical model includes equations for Bragg wavelength shift due to temperature changes, considering thermo-optic and thermal expansion coefficients.
2：Sample Selection and Data Sources:
A uniform FBG with specific parameters (e.g., grating length, refractive index) is used. The FBG is fabricated in a single-mode fiber.
3：List of Experimental Equipment and Materials:
A broadband light source, optical spectrum analyzer, temperature controller, and FBG sample are used. The FBG is heated using a temperature-controlled setup.
4：Experimental Procedures and Operational Workflow:
The FBG is subjected to temperature variations from 21°C to 61°C. The reflected wavelength is measured using an optical spectrum analyzer at different temperatures to observe the shift.
5：Data Analysis Methods:
The wavelength shift is analyzed based on theoretical predictions, and linearity of the shift with temperature is verified.
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