Investigation of the net gain behavior in Er:Ti:LiNbO3 waveguide amplifier by an erbium-doped As2S3 and undoped As2S3 overlay

• Published in: Applied physics. B, Lasers and optics Vol. 127; no. 5
• Main Authors: Ahmadi, Keyvan, Zakery, Abdolnasser
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2021; Springer Nature B.V
• Subjects: Amplification; Amplifiers; Applied physics; Arsenic trisulfide; Diffusion pumps; Engineering; Erbium; Lasers; Lithium niobates; Optical Devices; Optical properties; Optical pumping; Optics; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Quantum Optics; Waveguides; Wavelengths
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-021-07617-6

In this work the fabrication and characterization of As 2 S 3 and erbium-doped As 2 S 3 layers on Er:Ti:LiNbO 3 channel waveguide amplifiers are reported and compared with Er:Ti:LiNbO 3 channel amplifier for the first time to the author’s knowledge. We have first characterized a typical Er:Ti:LiNbO 3 waveguide amplifier of 2.6 cm length and measured a small signal net gain of 2.5 dB for TM mode under 1470 nm pumping. Further optical characterization of Er:Ti:LiNbO 3 case was also performed for two wavelengths of 1531 and 1550 nm in an Er:Ti:LiNbO 3 case of 3.5 cm length. Signal enhancement of 22.234 and 6.463 dB was obtained for two wavelengths respectively and showed a stability behavior for an incident pump power of about 144 mW. As 2 S 3 layer and erbium doped As 2 S 3 waveguide layer were deposited by thermal and co-sputtering respectively on two Er:Ti:LiNbO 3 channel waveguide amplifiers as hybrid waveguide amplifiers then absorption and amplification were characterized. Whilst net gain was not improved due to the presence of pump-induced up-converted green light and moisture diffused in overlay waveguides, this nonetheless represents a further step towards the realization of hybrid waveguide amplifiers with loss compensation in nonlinear photonics.