Title :
3-D semivectorical beam propagation analysis of a spotsize-converter-integrated laser diode in the 1.3-μm-wavelength region
Author :
Kawano, K. ; Kohtoku, M. ; Wada, M. ; Okamoto, H. ; Itaya, Y. ; Naganuma, M.
Author_Institution :
NTT Opto-Electron. Labs., Kanagawa, Japan
Abstract :
Spotsize converters (SSCs), consisting of a lateral taper, thin-film core, and ridge, have been accurately designed to develop spotsize-converted laser diodes (SS-LDs) in the 1.3-μm-wavelength region based on the 3-D semivectorial finite-difference beam propagation method (FD-BPM) with nonequidistant discretization. The effects of the structural parameters on the sum of spot-conversion loss and coupling loss between the laser diode eigenmode and single-mode fiber (SMF) eigenmode are clarified. It is shown that a small loss of around 1.5 dB can be realized by introducing nonlinear tapers to these types of SSC´s. The calculated results agree well with the measured results.
Keywords :
finite difference methods; infrared sources; integrated optics; laser transitions; optical design techniques; optical fibre couplers; optical films; optical losses; optical waveguide theory; optical waveguides; semiconductor lasers; waveguide lasers; /spl mu/m-wavelength region; 1.3 mum; 1.5 dB; 3-D semivectorial finite-difference beam propagation method; 3D semivectorical beam propagation analysis; coupling loss; laser diode eigenmode; lateral taper; nonequidistant discretization; nonlinear tapers; ridge waveguides; single-mode fiber coupling; single-mode fiber eigenmode; small loss; spot-conversion loss; spotsize-converter-integrated laser diode; structural parameters; thin-film core; Coupling circuits; Diode lasers; Fiber nonlinear optics; Laser beams; Nonlinear optics; Optical coupling; Optical films; Optical propagation; Optical waveguides; Transistors;
Journal_Title :
Photonics Technology Letters, IEEE
