研究目的
Investigating the all-optical phase shifter and switch based on a microfiber coated with colloidal quantum dots for fiber communication and signal processing applications.
研究成果
The fabricated all-optical phase shifter and switch based on CQDs coated microfiber can achieve a phase shift with a linear slope of 0.092 π/mW and an extinction ratio of 13 dB, demonstrating potential for fiber communication, optical routing, and signal processing applications.
研究不足
The insertion loss increases with the thickness of the CQD layer, and higher pump power efficiency requires optimization of the CQD layer thickness.
1：Experimental Design and Method Selection:
The study involves the fabrication of an all-optical phase shifter and switch using a microfiber coated with colloidal quantum dots (CQDs). The phase shift is controlled by a 980 nm pump light, altering the refractive index of CQDs due to photoexcitation dynamics.
2：Sample Selection and Data Sources:
A microfiber tapered from a standard single mode fiber (SMF) is used, with a taper waist length of 1 cm and diameter of 8.9 μm. PbS CQDs with an absorption wavelength at 1550 nm are synthesized and coated on the microfiber.
3：9 μm. PbS CQDs with an absorption wavelength at 1550 nm are synthesized and coated on the microfiber.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a Vytran GPX 3400 glass processing platform for microfiber tapering, a 980/1550 wavelength division multiplexer (WDM), a broadband source (BBS), and an optical spectrum analyzer (OSA).
4：Experimental Procedures and Operational Workflow:
The microfiber coated with CQDs is inserted into one arm of a fiber Mach-Zehnder interferometer (MZI). The phase shift and switch performance are measured by varying the pump light power and observing the transmission spectrum.
5：Data Analysis Methods:
The relationship between pump light power and phase shift is analyzed, and the extinction ratio of the optical switch is measured.
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