研究目的
To develop a high-speed fiber-integrated all-optical modulator based on a polymer nanofiber Bragg grating printed by femtosecond laser, addressing the challenge of connecting on-chip optical modulators with fiber systems.
研究成果
The developed polymer NFBG-based all-optical modulator demonstrates high sensitivity (-45.43 pm/mW) and fast temporal response (176 ns), with excellent linearity. It offers a novel solution for fiber-integrated optical modulation, overcoming limitations of silica FBGs and 2D material-based modulators. The study also identifies operational constraints related to power and humidity, suggesting directions for future optimization.
研究不足
The device's operational power threshold is limited to below 50 mW to avoid photo-annealing effects, and optimal performance is confined to humidity levels between 30%RH and 50%RH. The frequency range of normal operation is under 1.44 MHz, beyond which signal distortion occurs.
1：Experimental Design and Method Selection:
The study employs femtosecond laser subtractive and additive manufacturing to fabricate a polymer nanofiber Bragg grating (NFBG) integrated within a silica hollow core fiber. The design rationale focuses on leveraging the polymer's high thermo-optical coefficient and the Bragg grating's spectral properties for optical modulation.
2：Sample Selection and Data Sources:
The polymer NFBG is fabricated using a custom photoresist with specific monomers to enhance mechanical strength and photosensitivity. The device's performance is evaluated using optical spectrum analysis and dynamic response measurements.
3：List of Experimental Equipment and Materials:
Key equipment includes a femtosecond laser for fabrication, a broadband light source (BBS), tunable laser (TL), optical spectrum analyzer (OSA), and a variable optical attenuator (VOA). Materials include a custom photoresist and silica hollow core fiber.
4：Experimental Procedures and Operational Workflow:
The fabrication involves splicing a hollow core fiber between two thin-core fibers, drilling grooves for photoresist filling, printing the NFBG structure using femtosecond laser, and cleaning unpolymerized resin. The device's static and dynamic responses are then tested under varying pump powers and environmental conditions.
5：Data Analysis Methods:
The study analyzes the Bragg resonant wavelength shift under optical pumping, temporal response characteristics, and the impact of environmental factors like humidity on device performance.
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