NDLI: 980-nm-pumped Er-doped LiNbO/sub 3/ waveguide amplifiers: a comparison with 1484-nm pumping

Content Provider	IEEE Xplore Digital Library
Author	Huang, C.-H. McCaughan, L.
Copyright Year	1995
Abstract	We have investigated by numerical modeling the relative efficacy of 980-nm and 1484-nm-pumped guided-wave optical amplifiers in Er-doped LiNbO/sub 3/. The shorter wavelength produces a larger differential gain, but the waveguide amplifier suffers from the photorefractive effect if no precautions are taken. Model calculations show that an optical gain of 2.5 dB/cm can be achieved at 80-mW 980-nm pump power, compared to 1.3 dB/cm when pumped at 1484 nm. Experimental results using 80 mW 980 nm give a gain of /spl sim/2.2 dB/cm (minus propagation loss). This gain, however, is degraded by photorefractive damage, which we find is not only due to the 980-nm pump light, but also to the green up-converted light, the latter having the larger effect. Several techniques were shown to reduce the photorefractive damage. ZnO indiffused waveguides in MgO-doped LiNbO/sub 3/ substrates proves to be the most effective. In bulk-doped Er:Mg:LiNbO/sub 3/ samples with ZnO waveguides, an optical gain of 1.6 dB/cm (minus propagation loss) was observed with 54 mW of out-coupled pump power.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	367
Ending Page	372
Page Count	6
File Size	143061
File Format	PDF
ISSN	1077260X
Volume Number	2
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical waveguides Optical pumping Photorefractive effect Gain Stimulated emission Optical amplifiers Propagation losses Zinc oxide Numerical models Semiconductor optical amplifiers
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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