Analysis of TE and TM modes in DFB lasers by two-dimensional theory
- Semiconductor Research Center, Matsushita Electric Industrial Co., Ltd., Moriguchi, Osaka 570 (JP)
This paper reports on the two-dimensional theory of a distributed feedback (DFB) laser, which the authors previously presented and applied to the analysis of the laser threshold conditions for the TE mode in a simple three-layer waveguide structure, which is developed to treat both TE and TM modes in a four-layer waveguide structure with a thin grating layer, which more closely reflects actual DFB laser structure. The differences between TE and TM modes with respect to the dispersion relations and the laser threshold conditions are clarified. Then the effects of the waveguide structure, which includes grating layer thickness, refractive indexes of layers, coupling constant, and corrugation period, on the threshold gains and the gain differences between the two longitudinal modes on both sides of the Bragg frequencies are studied for both TE and TM modes in detail. The effects of the facet reflection on the threshold conditions of TE and TM modes are also studied, and DFB lasers with asymmetric index structures with large confinement factors in the grating layers, are predicted to show high probability of single longitudinal TE mode operation compared with conventional DFB lasers with symmetric index structure.
- OSTI ID:
- 5705535
- Journal Information:
- IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States) Vol. 27:7; ISSN 0018-9197; ISSN IEJQA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analysis of TE/TM mode selectivity in DFB lasers with a phase-shift region
Two-dimensional theory of distributed feedback semiconductor lasers