Birefringence-free semiconductor waveguide

Details Birefringence-free semiconductor waveguide Birefringence-free semiconductor waveguide

1995-03-30

1998-03-24

Ullah, Akm E.

Optical waveguides

Planar optical waveguide

Thin film optical waveguide

G02B 610

Patent

active

057321795

ABSTRACT:
A birefringence-free semiconductor waveguide comprising on a substrate a plurality of layers some of which are in tensile strain with respect to the substrate and others of which are in compressive strain. Birefringent-free behavior with respect to a guided light signal traveling in the waveguiding structure and possessing a photon energy lower than the bandgap of the constituent waveguide layers is obtained when birefringence introduced into the individual layers of the waveguiding structure by the strain is sufficient to compensate for the intrinsic geometric modal birefringence of the waveguiding structure that exists in the case where all layers are not strained. This is achieved through the introduction of a predetermined amount of tensile strain into one of more layers possessing a bandgap energy relatively close to the photon energy of the guided light and the introduction of a predetermined amount of compressive strain into one or more layers possessing a bandgap energy that is relatively further from the photon energy of the guided light signal. In this manner, waveguiding structures that are substantially free of modal birefringence may be obtained with partial or complete strain compensation so as to avoid any strain-induced defects.

REFERENCES:
patent: 5008717 (1991-04-01), Bar-Joseph et al.
patent: 5028108 (1991-07-01), Young
patent: 5034783 (1991-07-01), Chang et al.
patent: 5090790 (1992-02-01), Zucker
patent: 5115488 (1992-05-01), Islam et al.
patent: 5117469 (1992-05-01), Cheung et al.
patent: 5159481 (1992-10-01), Maeda
Soole et al., "Monolithic InP/ GaAsP/InP grating spectrometer for the 1.48-1.56um wavelength range," Applied Physics Letters, vol. 58, 1991, pp. 1949-1951.
M. Zirngibl et al., "Demonstration of a 15.times.15 Arrayed Waveguide Multiplexer on InP," IEEE Photonics Technology Letters, vol. 4, 1992, pp. 1250-1253.
Heismann, "Analysis of a Reset-Free Polarization Controller for Fast Automatic Polarization Stabilization in Fiber-optic Transmission Systems", Journal of Lightwave Technology, vol. 12, 1994, pp. 690-699.
Heismann et al., "Electrooptic Polarization Scramblers for Optically Amplified Long-Haul Transmission Systems," IEEE Photonics Technology Letters, vol. 9, 1994, pp. 1156-1158.
Bissessur et al., "16 channel phased array wavelength demultiplexer on InP with low polarization sensitivity," Electronics Letters, vol. 30, 1994, pp. 2336-2337.
Chiang, "Dispersion characteristics of strip dielectric waveguides," IEEE Transactions on Microwave Theory and Techniques, vol. 39, pp. 349-352, 1991.
Verbeek et al., "Large Bandwidth Polarization Independent and Compact 8 Channel PHASAR Demultiplexer/Filter,", PD13, Optical Fiber Conference, pp. 63-65, San Jose, CA., Feb. 20-25, 1994.
Zucker et al., "Strained quantum wells for polarization-independent electrooptic waveguide switches," Journal of Lightwave Technology, vol. 10, 1992, pp. 1926-1930.
Joma et al., "Strained layer quantum well semiconductor optical amplifiers: polarization-insensitive amplification", Fiber and Integrated Optics, vol. 10, 1991, pp. 361-364.
Ravikumar et al., "Observation of polarization independent electro-optic effect in InGaAs/InP tensile strained quantum well and its proposal for optical switch," Applied Physics Letters, vol. 61, 1992, pp. 1904-1906.
Tiemeijer et al., "Polarization insensitive multiple quantum-well laser amplifiers for the 1300nm window," Applied Physics Letters, vol. 62, 1993, pp. 826-829.
Newkirk et al., "1.5 um Multiquantum-Well Semiconductor Optical Amplifier with Tensile and Compressively Strained Wells for Polarization-Independent Gain," IEEE Photonics Technogty Letters, vol. 4, 1993, pp. 406-408.
Tada et al., "Polarization-independent optical waveguide intensity switch with parabolic quantum well," Applied Physics Letters, vol. 59, 1991, pp. 2778-2780.
Yamaguchi et al., "Polarization-Independent Waveguide Modulator Using a Novel Quantum Well with Mass-Dependent Width", IEEE Photonics Technology Letters, vol. 6, 1994, pp. 1442-1444.
Marcuse, Theory of Dieletric Optical Waveguides, 2nd ed., Academic Press, 1991, pp. 1-59.
Matthews et al., "Defects in Epitaxial Multilayers," Journal of Crystal Growth, vol. 27, 1974, pp. 118-125.
Adachi, Physical Properties of III-V Semiconductory Compounds: InP, InAs, GaAs, GaP, InGaAs, and InGaAsP, Wiley, 1992, pp. 193-201, pp. 263-287.

Affiliated with

Also associated with

Rating

Birefringence-free semiconductor waveguide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Birefringence-free semiconductor waveguide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Birefringence-free semiconductor waveguide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2296255