Low loss semiconductor directional coupler switches including ga

Details Low loss semiconductor directional coupler switches including ga Low loss semiconductor directional coupler switches including ga

1989-09-06

1991-04-02

Healy, Brian

350 9613, 350 9615, 350320, 357 4, 357 16, 357 30, G02B 610, G02B 626, H01L 2712

Patent

active

050044478

ABSTRACT:
In multiple quantum well directional couplers, non-centralized input and output legs, occupying major portions of the switches, are continuously forward biased, to produce sufficient gain in light intensity therein to overcome losses in the centralized portions, to in turn provide a transparent (ODB loss) two-by-two coupler switch. Short segments of the centralized coupling portion occupying minor portions of the switches, are switched between forward bias states and zero bias states to provide light beam switching. Thus these switches employ both carrier gain and carrier refraction. The large changes in the index of refraction enable extremely short, low loss, switches to be fabricated and cascaded if desired. A second group of less preferred switches employ solely the carrier refraction effect, by injecting carriers into the waveguides at high levels, preferably equal to or greater than 1.times.10.sup.18 /cm.sup.3.

REFERENCES:
patent: 4717228 (1988-01-01), Thylen
patent: 4728167 (1988-03-01), Soref et al.
patent: 4737003 (1988-04-01), Matsumura et al.
patent: 4784451 (1988-11-01), Nakamura et al.
patent: 4798435 (1989-01-01), Fujiwara et al.
patent: 4832430 (1989-05-01), Tada et al.
patent: 4865408 (1989-09-01), Korotky
patent: 4923264 (1990-05-01), Langer et al.

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