Tapered semiconductor waveguides

Details Tapered semiconductor waveguides Tapered semiconductor waveguides

1989-08-03

1990-06-05

Sikes, William L.

Coherent light generators

Particular active media

Semiconductor

372 46, 372 50, H01S 319

Patent

active

049320327

ABSTRACT:
Adiabatic mode control and structural reproducibility are achieved by a tapered semiconductor waveguide structure wherein semiconductor guiding layers are interleaved with stop-etch layers and each successive guiding layer extends further along the propagation axis of the waveguide than the guiding layer immediately adjacent thereabove to create a staircase-like core or guiding structure. Cladding regions of appropriate semiconductor material having a lower index of refraction than the tapered core structure may be added to completely surround the tapered guiding structure. The profile of the tapered structure is realizable as any desired staircase-like shape such as linear, parabolic, exponential or the like. Additional layers of higher index of refraction semiconductor material may be included in the cladding region to permit additional beam shaping of the expanded spatial mode propagating along the tapered waveguide.

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