研究目的
To analyze the effect of localized thermal effect on Chirped Fiber Bragg Grating (C-FBG) using a micro-size heating element to achieve confined heating, and to understand how the spectral response can be manipulated by varying the magnitude and position of the applied heat.
研究成果
The study demonstrates that confined heating on a C-FBG induces a phase-shift dip in the reflection spectrum, with its characteristics (depth, linewidth, and center wavelength) dependent on the magnitude and position of the applied heat. This allows for elastic spectral shaping of C-FBGs, enabling dynamic control in optical applications. The findings suggest that precise manipulation of heat can tailor spectral responses, opening up new possibilities for reconfigurable optical devices in communication and sensing systems. Future work could focus on optimizing heating techniques and exploring applications in real-world scenarios.
研究不足
The experiment was limited to electrical current values up to 200mA to prevent reaching the melting point of the tungsten wire, which may restrict the range of observable effects. The use of a specific type of C-FBG (linearly-chirped) and the micro-size heating element might not generalize to other grating types or heating methods. Potential optimizations could include exploring higher current ranges with better heat management or using different heating elements for broader applicability.
1：Experimental Design and Method Selection:
The experiment was designed to investigate the effects of confined heating on a C-FBG using a micro-size tungsten wire as the heating element. The rationale was to achieve localized thermal distribution and observe changes in the reflection spectrum, including center wavelength, linewidth, and depth of phase-shift dip. Theoretical models based on Bragg wavelength equations were employed to explain the effects of temperature and strain.
2：Sample Selection and Data Sources:
A ~20mm C-FBG written in standard single-mode fiber for optical communication was used, with specified characteristics: center Bragg wavelength ~1544nm, peak reflectivity ~90%, and linewidth ~40.8nm. Data were collected using an optical spectrum analyzer (OSA).
3：8nm. Data were collected using an optical spectrum analyzer (OSA).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a fine tungsten wire (18μm diameter) as the heating element, fiber optic clamps, a horizontal movable stage with micrometer resolution, an optical spectrum analyzer (OSA) with 0.02 nm resolution, a broadband amplified spontaneous emission (ASE) light source, and an optical circulator.
4：02 nm resolution, a broadband amplified spontaneous emission (ASE) light source, and an optical circulator.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The C-FBG was securely held with clamps. The tungsten wire was placed in contact with the C-FBG, and its position was adjusted using the movable stage. Electrical current was applied to the wire to generate heat, and the reflection spectrum was monitored with the OSA. Experiments varied current magnitude (from 120mA to 200mA) and wire position (in 2mm steps along the C-FBG).
5：Data Analysis Methods:
Spectral data were analyzed to measure changes in center wavelength, linewidth, and depth of the phase-shift dip. Linear relationships were identified and plotted against current and position variables.
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