DETERMINATION OF EMISSION AND ABSORPTION CROSS-SECTIONS OF ER3-LINBO3WAVE-GUIDES FROM TRANSVERSAL FLUORESCENCE-SPECTRA( IN TI)

A procedure for the determination of Er3+ emission and absorption cros s sections in integrated waveguides from transversal fluorescence spec tra is presented. It is based on an approximate treatment of McCumber' s theory, which was demonstrated to provide accurate values for Er3+-d oped silica fibres. Results on the I-4(13/2) <-> I-4(15/2) transition of Er3+ in Ti:LiNbO3 waveguides pumped by a 980 nm laser diode are sho wn and compared to results from attenuation measurements. Advantages o ver other procedures for waveguide characterization (less dependence o n experimental inaccuracies, all measurements are made on the waveguid e, consideration of codoping influence and no pump interference around 1.5 mu m) are discussed in detail.