Polarization insensitive/independent semiconductor waveguide mod

Details Polarization insensitive/independent semiconductor waveguide mod Polarization insensitive/independent semiconductor waveguide mod

1998-03-24

2000-06-13

Jackson, Jr., Jerome

Active solid-state devices (e.g., transistors, solid-state diode

Thin active physical layer which is

Heterojunction

257 18, 257184, 359245, 359248, H01L 29205, H01L 310304

Patent

active

060752548

ABSTRACT:
A semiconductor waveguide modulator that is polarization insensitive/independent at bias variations for any chosen wavelength. The modulator of the present invention employs a novel type of strained semiconductor quantum well (QW) structure that exhibits bias independent, heavy-hole and light hole degeneracy. This effect is achieved by inserting one or two thin layers of highly tensile, strained materials in a specific position within the QW. By adjusting the thickness and the position of the highly tensile strained layers, the quantum confined Stark effect (QCSE) for the heavy hole and light hole can be engineered separately to control the bias dependent polarization properties. The present invention has applications, for example, in optoelectronic devices in the areas of telecommunications, optical signal processing, scanning and displays.

REFERENCES:
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patent: 5153687 (1992-10-01), Ishihawa
patent: 5488507 (1996-01-01), Nishimura
patent: 5579331 (1996-11-01), Shen et al.
patent: 5757023 (1998-05-01), Koteles
Wiedemann et al "MOVPE . . . MQW . . . Devices" Journal of Crystal Growth 0(1997) 117-121.
Magari, K. et al., "Polarization Insensitive Traveling Wave Type Amplifier Using Strained Multiple Quantum Well Structure," IEEE Photonics Technology Letters, vol. 2, No. 8, 556 (Aug. 1990).
Chen, Y. et al., "Polarization Independent Strained InGaAs/InGaAlAs Quantum-Well Phase Modulators," IEEE Photonics Technology Letters, vol. 4, No. 10, 1120 (Oct. 1992).
Shen, H. et al., "Bias Independent Heavy-and Light-Hole Degeneracy in InGaAs/InGaAsP Quantum Wells," Applied Physics Letters, vol. 72, No. 6 (Feb. 1998).

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