Title :
Index contrast scaling for optical amplifiers
Author :
Saini, Sajan ; Michel, Jurgen ; Kimerling, Lionel C.
Author_Institution :
Dept. of Mater. Sci. & Eng., Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
A scaling methodology for optically pumped waveguide amplifiers is presented as a function of their core-cladding index contrast. Increasing index contrast results in two crucial advantages: 1) an increase in gain efficiency and 2) a decrease in the areal footprint of a planar structure. Increasing index contrast is observed to have no effect on the output noise figure. A figure of merit summarizing these advantages demonstrates the powerful role of index contrast as an enabler for improving planar amplifier performance. Design rules are presented in the form of performance maps, allowing waveguide designers to optimize amplifier length and footprint. Using the Er-doped waveguide amplifier as a case study, we design an optical amplifier with >3-dB/cm gain within a 300×300-μm2 area, powered by a single 1-mW pump source. This work represents a design rule approach for making a scalable microphotonic optical amplifier.
Keywords :
erbium; laser noise; optical communication equipment; optical design techniques; optical planar waveguides; optical pumping; refractive index; solid lasers; 1 mW; 300 micron; Er-doped waveguide amplifier; gain efficiency; index contrast; index contrast scaling; optical amplifier; optical amplifiers; optically pumped waveguide amplifiers; output noise figure; planar amplifier performance; planar structure; pump source; scalable microphotonic optical amplifier; scaling methodology; waveguide designers; Optical amplifiers; Optical design; Optical planar waveguides; Optical pumping; Optical signal processing; Optical waveguides; Planar waveguides; Power amplifiers; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2003.817707
