Polymer Optical Waveguide Amplifier Operating At 650nm Based On KMnF₃:Yb³⁺,Er³⁺ Co-dopednanocrystals

Since the wavelength radiated from the energy level⁴I_13/2?⁴I_15/2of the Er³⁺ion matches the low loss telecommunication window in the range of 1530 nm to 1565 nm.Moreover,Erbium-doped waveguide amplifiers?EDWA?with their excellent advantages in terms of simple processing and easy integration has attracted more and more attention.At present plastic optical fiber has played a special role in the cabling of the family in the last kilometer of fiber to the home?FTTH?because of its good flexibility,convenient wiring and easy connection,can promote the full realization of triple play.Plastic optical fiber has a good market application prospects.And most of the network equipment used in the plastic optical fiber transmission system are mainly based on 650 nm light source.The corresponding communication device has become the core of the network system equipment.In this paper,two kinds of polymer optical waveguide amplifiers based on erbium-doped fluoride nanocrystals were fabricated at the wavelength of 1550 nm optical communication and the650 nm plastic optical fiber communication system.We synthesize the material,design the structure of the device,fabricate the waveguide amplifiers and test the gain characteristics in detail.First,we prepared the polymer optical waveguide amplifiers based on NaYF₄:Er³⁺nanocrystals by high temperature thermal decomposition method.In the paper,a four-level system model for Er³⁺ was established with 1480 nm pumped.And the corresponding atomic rate equation and the propagation equations were given.The gain characteristics at 1550 nm of the NaYF₄:Er³⁺nanocrystals polymer optical waveguide amplifier are simulated by Matlab software.The optical waveguide amplifier based on NaYF₄:Er³⁺nanocrystals was prepared by the traditional semiconductor technology.As shown,when the signal power was 0.1m W,the pump power was 390 m W,the relative gain 3.67 d B was achieved.In this thesis,the core-shell KMnF₃:18%Yb³⁺,1%Er³⁺@KMnF₃:2%Yb³⁺nanocrystals?NCs?were synthesized with the method of solvent thermal.These nanocrystals have a very high monochrome and strong red upconversion luminescence,the center wavelength is 650 nm.The concentration of the Er³⁺ and Yb³⁺ were optimized through repeated comparison and analysis.The luminescence mechanism was characterized by analyzing the transition of the energy level,which was a good explain that the corresponding peak of the absorption spectraand fluorescence spectra of the nanocrystals.The gain characteristics of the EDWA were simulated.The core-shell KMnF₃:18%Yb³⁺,1%Er³⁺@ KMnF₃:2%Yb³⁺ NPs with bright red upconversion fluorescence was dispersed into PMMA as a gain medium.We constructed optical waveguide amplifiers with a structure of embedded waveguide,the gain medium was embedded into the groove.When the device was excited under 980 nm laser source,a relative gain of 2.7d B at 650 nm in the optical waveguide amplifier with a length of 1.1 cm as the pump power was 260 m W and the signal power was 0.1m W.