High Gain C-band Er³⁺/Yb³⁺-doped Phosphate Glass Waveguide Optical Design And Signal Amplification Simulation

The rapid development of all-optical communication promoted the large-scale construction of long-distance fiber-optic network,how to reduce the signal loss in optical communication and improve the integration of the devices has always been a hot research topic in optical communication field.Phosphate glass with high rare earth ion solubility is always considered to be a favaroble host material for optoelectronic devices fabracation,since the fluorescence-quenching phenomenon can be effectively avoided.After K+-Na+ ion exchanging process,the electric field assisted annealing embedded in the board phosphate glass waveguide showed lower surface scattering loss,more symmetrical refractive index distribution,as well as a good compatibility with the singlemode fiber.Compared to the other signal amplfier,the sunken Er3+/Yb3+ doping ion exchange phosphate waveguide amplifier holds higher gain in the C-band(1530-1565 nm)optical communication transmission window,and with smaller size,ease for integration,hence high signal gain is promising to be obtained in a tiny size of substrate.The main ways of improving the gain performance of Er3+ doping optical waveguide are:I.Increasing the doping concentration,but it high doping concentration will lead to severe ion aggregation,which resulting in the luminous efficiency reduced of Er3+,?.Extending the waveguide path.Therefore designing an excellent waveguide structure in a limited size substrate,and enhancing the effective signal amplification path of optical waveguide have become the most convenient and effective way to improving the gain performance integrated waveguide.In this work,Er3+/Yr3+ codoped phosphate glass was adopted as the matrix material of the planar waveguide,three different bent structure of the waveguide(S-bend,U-bend,F-bend)were designed,the extension of the waveguide in the signal light amplification path theoretical expectations and the optical gain in the waveguide.The results indicated that,the waveguide geometry optimization can effectively improve the optical gain of waveguide,reasonable structure design can significantly smaller size substrate signal gain.F-type bent waveguide has excellent gain and integration,and the feasibility of phosphate glass waveguide integrated device development ideas.