Rib waveguide type semiconductor laser

Coherent light generators – Particular active media – Semiconductor

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372 45, 357 16, 357 17, H01S 319

Patent

active

049598392

ABSTRACT:
A rib waveguide type semiconductor laser including p-type high impurity concentration layer formed between a p-upper cladding layer and p-ohmic layer and having an impurity concentration higher than the impurity concentration of the p-upper cladding layer and p-ohmic layer. The high impurity concentration layer acts to make small a discontinous portion of the valence band between the p-upper cladding layer and p-ohmic layer and change the steep junction to a smoothly inclined junction, thereby lowering the voltage drop across the junction.

REFERENCES:
patent: 4792958 (1988-12-01), Ohba et al.
patent: 4845724 (1989-07-01), Hayakawa et al.

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