The Basic Research Of Erbium-ytterbium Co-doped Optical Waveguide Amplifier Under LED Pumping

Rare-earth-doped optical waveguide amplifier(RDWA)is one of the important components of optoelectronics and integrated optics,which can effectively compensate for various losses during optical transmissions.In RDWA the erbium-ytterbium codoped optical waveguide amplifier(EYDWA)has a good amplifications effect at the 1550 nm wavelength of the third standard communication window,which is favored by researchers.With the development of planar integrated optics,EYDWA with stable gain performance,small size and easy integrations has become the focus of research.However,the traditional EYDWA usually uses a 980 nm laser diode(LD)as the pump source.This pumping method requires a wavelength division multiplexer to be coupled with the 1550 nm signal laser into the waveguide.It will not only bring additional optical loss,but also can only be axially coupled in one-dimensional direction,which is very unfavorable for integration.Based on this,this article proposes to pump the EYDWA vertically from the top using a 405 nm Light-emitting diode(LED).This method not only allows EYDWA to be flexibly placed in any positions of the planar optical interconnections,which is convenient for integrations,but also has the advantages of low cost and good thermal stability.The main contents of the thesis are as follows:1.The establishment and numerical simulation of the gain theoretical model of EYDWA under 405 nm LED and 980 nm LD pumping has been completed.The energy level transition system under 405 nm and 980 nm pumping has been established and the optical power transmission equations under vertical pumping at the top of the LED and coupled pumping at the end of the LD has been established;The gain simulation calculation has been completed.2.The calculations of important spectral parameters of erbium-ytterbium co-doped phosphate glass has been completed.The absorption and emission properties of erbiumytterbium co-doped phosphate glass were characterized;The important spectral parameters are calculated by Judd-Ofelt theory.3.The gain test system of the optical waveguide amplifier was built,and the influence of different excitation wavelengths on the gain was studied.When pumping with 980 nm LD,a relative gain of 8.9 dB/cm and an internal gain of 7.5 dB/cm are obtained;When pumping with 275 nm LED,an internal gain of about 4.1 dB/cm is obtained.When pumping with 310 nm,365 nm,405 nm,and 520 nm LED,the relative gains of 3.2 dB/cm,4.7 dB/cm,7.8 dB/cm,and 6.2 dB/cm are obtained respectively.