Multiwavelength LED and laser diode optical source

Details Multiwavelength LED and laser diode optical source Multiwavelength LED and laser diode optical source

1991-08-22

1992-08-11

Epps, Georgia Y.

Coherent light generators

Particular active media

Semiconductor

372 23, 372 46, 372 47, 372 50, 372 97, 357 16, 357 17, H01S 319

Patent

active

051386240

ABSTRACT:
The invention relates to the design of multiwavelength LED devices having multiple-lobe optical spectrums and laser diode devices with multiple designated wavelengths wherein the devices are formed by stacking various active layers of selected semiconductor materials whereby each layer is assigned to be active at a different wavelength. The independent layers are active at different wavelengths based on both their material composition and Quantum Well geometry. Independent control of current to each layer is allowed which in effect controls the spectral intensity distribution and the spectral widths. The step of allowing independent control of the current is achieved by considering the probabilities of carrier capturing, recombining carriers at various active layers and minimizing the current through all the barriers and cladding layers and optimizing the current through each active layer by controlling the individual thicknesses. For the LED device, the window and absorption sections within a Transverse Junction Geometry scheme exist to aid in control of the current within the device. For both the LED and laser devices, the active layer region can be varied in thickness in order to tailor the optical intensity of the devices.

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