Abstract
Germano-silicate glass optical fiber incorporated with PbTe semiconductor quantum dots (SQDs) in the core was fabricated by using the atomization process in modified chemical vapor deposition (MCVD) process. The absorption bands attributed to PbTe semiconductor quantum dots in the fiber core were found to appear at around 687 nm and 1055 nm. The nonlinear refractive index measured by the long-period fiber grating (LPG) pair method upon pumping with laser diode at 976.4 nm was estimated to be ~1.5 × 10(-16) m2/W.
Highlights
Glasses doped with IV-VI semiconductor quantum dots (SQDs) of lead chalcogenides such as PbS [1–12], PbSe [13–25], and PbTe [26–35] are candidates for optical communication devices applications because of their narrow band-gap, large optical nonlinearity and fast response time [34,36–40]
Since the PbTe SQDs doped optical fibers were made by using the conventional solution doping process (“soaking” process) where porous layers of a vertically positioned silica glass tube preform were soaked by the doping solution, the fiber preform tube must be replaced back to the modified chemical vapor deposition (MCVD) lathe, before and after the doping process
We proposed a new doping process, so-called atomization process, to incorporate PbTe SQDs in the core of the fiber for nonlinear optical application
Summary
Glasses doped with IV-VI semiconductor quantum dots (SQDs) of lead chalcogenides such as PbS [1–12], PbSe [13–25], and PbTe [26–35] are candidates for optical communication devices applications because of their narrow band-gap, large optical nonlinearity and fast response time [34,36–40]. Since the PbTe SQDs doped optical fibers were made by using the conventional solution doping process (“soaking” process) where porous layers of a vertically positioned silica glass tube preform were soaked by the doping solution, the fiber preform tube must be replaced back to the modified chemical vapor deposition (MCVD) lathe, before and after the doping process. To overcome such an inconvenience during the fiber preform preparation, in this paper, we proposed a new doping process (“atomization” process) to simplify the doping process and to increase the extent of dopants incorporation and concentration uniformity along with direction of the preform length. Effect of the fabrication process, the doping process, of the germano-silicate glass optical fibers incorporated with PbTe SQDs on optical absorption characteristics and nonlinear optical property was investigated
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