Guided wave device and method of fabrication thereof

Details Guided wave device and method of fabrication thereof Guided wave device and method of fabrication thereof

1995-08-30

1998-11-10

Bell, Janyce

Coating processes

Optical element produced

Polarizer, windshield, optical fiber, projection screen, or...

427261, 427266, 427287, 4273762, 4273735, 427404, B05D 506

Patent

active

058340556

ABSTRACT:
A method for co-diffusing titanium and aluminum into a single-crystal lithium niobate substrate and guided wave devices produced therefrom are provided. Titanium diffused into the substrate forms a light guiding region. A layer of aluminum deposited over the light guiding region and diffused into the substrate buries the light guiding region below the substrate surface. In an alternate embodiment, a layer of aluminum forms a mode shaping region which surrounds the light guiding region on two sides. The mode shaping region has ordinary and extraordinary indices of refraction less than the substrate such that mode mismatch between a device fabricated thereby and an externally coupled fiber is reduced. The aluminum can be diffused into LiNbO.sub.3 at a much lower temperature without affecting diffused titanium guides. Preferably, the titanium diffusion occurs at about 1000.degree. to about 1100.degree. C. while further aluminum diffusion occurs at a lower temperature in the range of about 900.degree. to 950.degree. C.

REFERENCES:
patent: 3837827 (1974-09-01), Carruthers et al.
patent: 4100313 (1978-07-01), Hammer et al.
patent: 4112148 (1978-09-01), Fonzi
patent: 4206251 (1980-06-01), Chen
patent: 4284663 (1981-08-01), Carruthers et al.
patent: 4376138 (1983-03-01), Alferness et al.
patent: 4400052 (1983-08-01), Alferness et al.
patent: 4439265 (1984-03-01), Alferness et al.
patent: 4598039 (1986-07-01), Fischer et al.
patent: 4607909 (1986-08-01), Sanford
patent: 4695121 (1987-09-01), Mahapatra et al.
patent: 4709978 (1987-12-01), Jackel
patent: 4714311 (1987-12-01), Auracher
patent: 4715027 (1987-12-01), Mahapatra et al.
patent: 4750979 (1988-06-01), Gee et al.
patent: 4775208 (1988-10-01), Robinson et al.
patent: 4776656 (1988-10-01), Sanford et al.
patent: 4778234 (1988-10-01), Papuchon et al.
patent: 4786131 (1988-11-01), Mahapatra et al.
patent: 4789212 (1988-12-01), Bristow et al.
patent: 4791388 (1988-12-01), Sanford et al.
patent: 4801872 (1989-01-01), Kitano
patent: 4851079 (1989-07-01), Booth et al.
patent: 5227913 (1993-07-01), McCaughan et al.
patent: 5319494 (1994-06-01), Miyaguchi et al.
patent: 5436992 (1995-07-01), Wang et al.
patent: 5452382 (1995-09-01), Shionoya et al.
van der Tol, J.J.G.M. and Laarhuis, J.H., "A Polarization Splitter on LiNbO.sub.3 Using Only Titanium Diffusion," Journal of Lightwave Technology, vol. 9, No. 7, pp. 879-886, (Jul., 1991).
Noda, J., et al., "Effect of Mg Diffusion on Ti-Diffused LiNbO.sub.3 Waveguides," Journal of Appl. Physics 49(6), pp. 3150-3154 (Jun. 1978).
Komatsu, K., et al., "Titanium/Magnesium Double Diffusion Method for Efficient Fiber-LiNbO.sub.3 Waveguide Coupling," Electron Lett., vol. 22, pp. 881-882, 1986. (no mo.).
Bulmer, C. H., "Directional Coupling Measurements and Calculations in Ti:LiNbO.sub.3 Channel Waveguides," Naval Research Laboratory, pp. 74-79, Proceedings of SPIE, vol. 408, Apr. 5-6, 1983.
Jiang, P., et al., "Buried Optical Waveguide Polarizer by Titanium Indiffusion and Proton-Exchange in LiNbO.sub.3," IEEE Photonics Technology Letters, vol. 4, No. 8, pp. 881-883 (Aug., 1992).
Akira Enohara et al., "Optical Modulating Element and Its Driving Method," 06-110023, Apr. 22, 1994, Japanese patent abstract.
Hideaki Okayama, et al., "Manufacture of WaveGuide Type Optical Switch," 01-88403, Apr. 3, 1989, Japanese patent abstract.
Hiroshi Terui, "Molecular Crystal Optical Element and Its Manufacture," 59-166922, Sep. 20, 1984, Japanese patent abstract.

Affiliated with

Also associated with

Rating

Guided wave device and method of fabrication thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Guided wave device and method of fabrication thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Guided wave device and method of fabrication thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1514479