Effect of external reflectors on longitudinal modes of distributed feedback lasers

TLDR

The study analyzes how external reflectors influence the longitudinal modes of distributed feedback lasers. The authors model dissimilar external reflectors at arbitrary positions relative to the DFB phase, derive an eigenvalue equation for propagation constants, and solve it numerically for realistic configurations. The numerical results reveal that mode thresholds, wavelengths, separations, and field distributions are highly sensitive to the relative strength and phase of the discrete and DFB reflectors, producing markedly asymmetric transmitted powers in GaAs and single‑reflector DFB lasers.

Abstract

The effect of external reflectors on longitudinal modes of distributed feedback (DFB) lasers is analyzed. The general case of dissimilar reflectors arbitrarily located relative to the phase of the DFB structure is considered. An eigenvalue equation for the propagation constants is derived and solved numerically for a variety of practical cases. Longitudinal mode thresholds, wavelengths, separations, and field distributions are obtained for GaAs lasers and for DFB lasers with a single reflector. It is shown that these quantities are very sensitive not only to the relative strength of the discrete and DFB, but also to the relative phases. Quite asymmetric transmitted powers are shown to occur under a variety of circumstances.