新型聚合物改性PbS/CdS量子点光纤放大器研究

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本文研究了基于铅硫(PbS)和镉硫(CdS)量子点(QDs)改性聚合物的光纤放大器。这项工作由上海大学特种光纤与光接入网络重点实验室的孙晓兰等人进行，他们联合上海大学纳米化学与纳米生物学研究所和美国亚利桑那大学光学科学学院的研究力量。研究的核心在于利用一种亲水-疏水( amphiphilic)共聚物对量子点进行改性，以实现对光纤涂层中PbS/CdS QDs的均匀和可重复掺入。首先，研究人员制备了具有明确结构的高质量PbS/CdS QDs，并通过设计合成了一种适合将QDs分散在硅溶剂中的亲水-疏水共聚物。这种共聚物的作用是确保量子点能够有效地融入光纤的硅包层，从而保证在光纤中的稳定分布。接下来，通过浸涂技术将含有QDs的硅溶剂沉积在熔融渐变光纤耦合器上，这一过程对于保持放大器性能至关重要。实验中，采用了1550纳米半导体发光二极管作为信号光源，980纳米激光二极管作为泵浦源，它们同时注入到光纤耦合器内。通过光的表面激发效应，量子点吸收泵浦光后，能够在光纤中释放出增强的信号光，从而实现光纤放大功能。这种设计的优势在于，通过共聚物的介合作用，优化了量子点的光吸收和发射特性，提高了光纤放大器的增益效率和稳定性。这项研究不仅展示了新型光纤放大器的潜在应用，也为未来开发高性能、低成本的光通信器件提供了一种新颖的方法。通过精细调控QDs和聚合物的组合，有望进一步提高放大器的性能，推动光纤通信技术的发展。此外，这项工作还涉及材料科学、量子点合成以及光纤工程等多个领域，体现了多学科交叉研究的重要性。该研究为实现高效、灵活的光纤放大技术迈出了重要的一步。

Optical fiber amplifiers based on PbS/CdS QDs

modified by polymers

Xiaolan Sun,

1,*

Libin Xie,

Wei Zhou,

Fufei Pang,

Tingyun Wang,

Alan R. Kost,

and

Zesheng An

The Key Lab of Specialty Fiber Optics and Optical Access Networks, Shanghai University, 200072, Shanghai

Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China

College of Optical Sciences, The University of Arizona, Tucson, AZ 85721-0094, USA

xiaolansun@shu.edu.cn

Abstract: Optical fiber amplifiers based on PbS/CdS semiconductor

quantum dots (QDs) modified by an amphiphilic polymer were

demonstrated. Well-defined QDs and an amphiphilic copolymer were first

prepared and the amphiphilic copolymer was then used to disperse the QDs

into silica sol to allow uniform and reproducible incorporation of QDs into

the silica coating of the optical fibers. QD-doped silica sol was deposited on

the fusion tapered fiber coupler via dip-coating. A 1550 nm semiconductor

light emitting diode as the signal source and a 980 nm laser diode as the

pump source were injected into the fiber coupler simultaneously. Through

evanescent wave excitation, a signal gain as high as 8 dB was obtained

within the wavelength range between 1450 and 1650 nm. In addition, the

optical fiber amplifiers based on PbS/CdS QDs showed enhanced thermal

stability when compared to amplifiers based on PbS QDs.

OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (060.4510) Optical

communications; (160.4236) Nanomaterials.

References and links

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multiexciton generation,” Science 324(5934), 1542–1544 (2009).

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17422–17428 (2005).

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CdSe/CdS core/shell nanocrystals with photostability and electronic accessibility,” J. Am. Chem. Soc. 119(30),

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9. A. Aharoni, T. Mokari, I. Popov, and U. Banin, “Synthesis of InAs/CdSe/ZnSe core/shell1/shell2 structures with

bright and stable near-infrared fluorescence,” J. Am. Chem. Soc. 128(1), 257–264 (2006).

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Bawendi, “(CdSe)ZnS core−shell quantum dots: synthesis and characterization of a size series of highly

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#186217 - $15.00 USD

Received 1 Mar 2013; accepted 6 Mar 2013; published 28 Mar 2013

8 April 2013 | Vol. 21, No. 7 | DOI:10.1364/OE.21.008214 | OPTICS EXPRESS 8214

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新型聚合物改性PbS/CdS量子点光纤放大器研究

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