Theory of linewidth for multielectrode laser diodes with spatially distributed noise sources

Linewidth of SG-DBR laser and its effect on DPSK transmission

“…The aggregate linewidth of the SG-DBR laser is calculated by the sum of (1) and (3) with different tuning currents [21]. The structural and physical parameters of the SG-DBR laser used in the simulation are the same as in [20].…”

Structure, Stability, and Spectra of Lateral Modes of a Broad-Area Semiconductor Laser

“…We obtain an equation for by taking the differential of (23) (24) where the differential is (25) By splitting (24) into real and imaginary parts, it can be written as the vector equation …”

Field rate equation and linewidth of semiconductor laser with inhomogeneous resonator medium

“…This approach also allows the evaluation of the spectral properties of composite-cavity lasers 13, 41, such as multisectional DFB-and DBR-lasers. In particular, Tromborg et al [4] have generalised Henry's method for arbitrary complex laser structures, leading to numerical evaluations of the corresponding wave equation. In this work, Henry's method of using Green functions is adopted for a Fabry-Perot laser with a composite waveguide resonator, the effective refraction index of which varies slowly in the axial direction, such that reflections are avoided at the inhomogenities.…”

“…Numerical solutions were applied by Tromborg et al [4] for more complicated multisectional DFB-and DBR-structures. Here, analytical formulations are derived for longitudinally inhomogeneous laser structures in the case of soft, taper-like transitions of the wavenumber k ( z ) such that dk/dz < k2 to avoid reflections at the inhomogenities.…”