A coupled-mode analysis of twin-stripe index-guided lasers

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.29302· OSTI ID:5636076

Paiss, I; Hardy, A

An approximated coupled-mode solution is presented to the problem of lateral mode behavior in twin-stripe index-guided injection lasers near threshold. The optical properties are determined by the coupling coefficients between the two waveguides which includes the external current-dependent perturbation to the dielectric constant. In the calculations of the external perturbation, a simple model of current spreading under the contacts and carrier diffusion in the active layer is given for a multistripe structure. The authors concentrate on the influence of the currents ratio on the lateral field shape and modal gain. It is shown that for symmetrical current injection, the fundamental supermode has a slight preference (higher gain) over the second 180/sup 0/ phase-shifted mode. As the injection current ratio is driven away from the symmetrical point, the second supermode is favored with increasing modal gain difference. The coupled-mode approach is relatively simple and can describe rather accurately this already known behavior.

• Research Organization: Dept. of Applied Physics, Tel Aviv Univ., Ramat Aviv 69 978, Tel Aviv (IL); Faculty of Engineering, Tel Aviv Univ., Ramat Aviv 69 978 (IL)
• OSTI ID: 5636076
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 25:7; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CALCULATION METHODS
CARRIER MOBILITY
COUPLING
DIELECTRIC PROPERTIES
DISTURBANCES
ELECTRICAL PROPERTIES
GAIN
LASERS
MOBILITY
MODE SELECTION
OPTICAL PROPERTIES
PHASE SHIFT
PHYSICAL PROPERTIES
WAVEGUIDES