Quantum Dot‐Doped Optical Fibers

Abstract

Gain medium‐doped active optical fibers for optical amplification and long‐range transmission have triggered a lot of researches. Traditional rare‐earth ion‐doped active fibers have non‐adjustable emissions, narrow band luminescence, limited gain enhancement, and other challenges. The unique optical properties of quantum dots (QDs) can further improve the doped optical fibers in the light amplification capacity, temperature sensitivity and to gain a broad‐spectrum coverage and lower laser threshold and other superiorities. However, there are few systematic discussions on the development of the technologies and applications of those QD‐doped optical fibers. In this review, the optical properties, temperature characteristics and optical amplification mechanisms of QD‐doped optical fibers are outlined. Then, the preparation technologies and the applications of QD‐doped optical fibers are highlighted. Additionally, the existing challenges and future development prospects of QD‐doped optical fibers are discussed.

Cobalt-Catalyzed Cascade C–H Activation/Annulation Polymerizations toward Diversified and Multifunctional Sulfur-Containing Fused Heterocyclic Polymers

“…Light/lasers with wavelengths of 632.8 and 1550 nm are broadly utilized in a wide range of fields; , we thus selected the n values of the polymer films at these two wavelengths to describe the light refractive properties. As expected, the results in Figure A demonstrated that all SFH polymers possessed high n values in a wide wavelength range with much higher n values at 632.8 nm ( n 632.8 ) than those of the commercially important optical plastics ( n = ∼1.49–1.59) .…”