@article{3038274, title = "Wavelength Tuning Analysis and Spectral Characteristics of Three-Section DBR Lasers", author = "Tsigopoulos, A. and Sphicopoulos, T. and Orfanos, I. and Pantelis, S.", journal = "IEEE Journal of Quantum Electronics", year = "1992", volume = "28", number = "2", pages = "415-426", issn = "0018-9197, 1558-1713", doi = "10.1109/3.123268", keywords = "Electric Networks - Transmission Line Theory; Mathematical Techniques - Matrix Algebra; Optical Communication Equipment; Waveguides, Optical, Active/Passive Interface; Distributed Bragg Reflector Lasers; Scattering Matrix; Transfer Matrix Method; Waveguide Discontinuity, Lasers", abstract = "A theoretical model for the design of three-section DBR lasers using the transfer matrix method is presented. The oscillation parameters as well as the tuning behavior and the linewidth are derived. The effect of a discontinuity of the waveguide at the active-passive interface is accounted for by using scattering matrix parameters, easily combined with transfer matrix method. The influence of such an interface is studied and the importance of optical losses at this point is discussed. © 1992 IEEE" }