title: Optical fiber amplifiers based on PbS/CdS QDs modified by polymers.
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.
authors.affiliation: The Key Lab of Specialty Fiber Optics and Optical Access Networks, Shanghai University, 200072, Shanghai. xiaolansun@shu.edu.cn
authors.forename: Xiaolan
authors.initials: X
authors.lastname: Sun
authors.forename: Libin
authors.initials: L
authors.lastname: Xie
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Fufei
authors.initials: F
authors.lastname: Pang
authors.forename: Tingyun
authors.initials: T
authors.lastname: Wang
authors.forename: Alan R
authors.initials: AR
authors.lastname: Kost
authors.forename: Zesheng
authors.initials: Z
authors.lastname: An
mesh_terms: D000669:Amplifiers, Electronic; D019187:Cadmium Compounds / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007854:Lead / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D011108:Polymers; D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead; C058667:cadmium selenide