Optical waveguides – Directional optical modulation within an optical waveguide – Acousto-optic
Patent
1998-05-22
2000-04-18
Palmer, Phan T. H.
Optical waveguides
Directional optical modulation within an optical waveguide
Acousto-optic
385 1, 385 11, G02F 1335
Patent
active
060524979
ABSTRACT:
A system, e.g., a wavelength division multiplexed optical network, having a tunable add/drop filter is provided. The filter of the invention contains a substrate having a waveguide capable of guiding both optical waves and acoustic waves. An interdigital transducer induces one or more acoustic waves of desired wavelengths in the waveguide, along the same direction as the optical waves, such that one or more desired optical wavelength channels are reversed in direction, i.e., reflected back in the direction from which the light entered the waveguide. The filter of the invention thus provides reversal of direction of selected optical wavelengths in a manner similar to that of a fiber grating, but, unlike a fiber grating, the filter of the invention is also capable of being tuned in real-time to reflect light of selected wavelength bands, by adjusting the frequency of the voltage applied to the interdigital transducer.
REFERENCES:
patent: 3822929 (1974-07-01), Heidrich et al.
patent: 3982817 (1976-09-01), Feichtner
patent: 4533207 (1985-08-01), Alferness
patent: 4565983 (1986-01-01), Gratze
patent: 5002349 (1991-03-01), Cheung et al.
patent: 5384799 (1995-01-01), Osterwalder
patent: 5400171 (1995-03-01), Song
patent: 5448665 (1995-09-01), Kershaw et al.
patent: 5611004 (1997-03-01), Chang et al.
patent: 5652809 (1997-07-01), Aronson
"Characteristics of Metal-Diffused LiNbO.sub.3 for Acoustic Devices", by Boyd, G.D. et al., Journal of Applied Physics, vol. 48, No. 7, pp. 2880-2881 (Jul. 1977).
"Polarization-Independent Acoustically Tunable Optical Filter", by Smith, D.A. et al, Appl. Phys. Lett., 56(3), pp. 209-211, (Jan. 15, 1990).
"Toward the Ideal Codirectional Bragg Filter with an Acousto-Optic-Filter Design", by Song, G. H., Journ. of Lightwave Techn., vol. 13, No. 3, pp. 470-480 (Mar. 1995).
"Sidelobe Suppression in an Acousto-Optic Filter with a Raised-Cosine Interaction Strength", by Smith, D. A. et al, Appl. Phys. Lett., 61(9), pp. 1025-1027 (Aug. 31, 1992).
"Tunable Acoustoopic Reflection Filters in LiNbO.sub.3 without a Doppler Shift", by Boyd, G. D. et al, Journ. of Lightwave Technology Technology, vol. 7, No. 4, pp. 625-631 (Apr. 1989).
"High-Performance Acousto-Optic Guided-Light-Beam Device Using Two Tilting Surface Acoustic Waves", by Tsai, C. S. et al., Applied Physics Letters, vol. 26, No. 4, pp. 140-142 (Feb. 15, 1975).
"Integrated Optics N x N Multiplexer on Silicon", by Dragone, C. et al., IEEE Photonics Tech. Lett., vol. 3, No. 10, pp. 896-899 (Oct. 1991).
"Elastic Waves in Solids", by Dieulesaint, E., published by John Wiley & Sons, pp. 401.
"Systematic Study of Acoustic Surface Modes and Their Acousto-Optic Coupling in LiNbO.sub.3 and LitaO.sub.3 ", by Flory, C. A. et al., IEEE 1990 Ultrasonics Symposium, vol. 2, pp. 631-636, Honolulu, HI (Dec. 4-7, 1990).
"Surface-Acoustic-Wave Directional Coupler for Apodization of Integrated Acousto-Optic Filters", by Smith, D. A. et al., IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 40, No. 1, pp. 22-25 (Jan. 1993).
"Low-Sidelobe Weighted-Coupled Integrated Acoustooptic Tunable Filter Using Focused Surface Acoustic Waves", by Kar-Roy, A., IEEE Photonics Technology Lett., vol. 4, No. 10, pp. 1132-1135 (Oct. 1992).
"Erbium-Doped Lithium Niobate Waveguide Devices", by Sohler, W., IEEE Lasers and Electro-Optics Society, 1995 Annual Meeting, Conf. Proc., vol. 2, pp. 283-284, (Oct. 30-Nov. 2, 1995).
"Low-Loss SAW Dispersive Filters with Low Sidelobe Level in Compressed Signal", by Kawalec, A. M., Opto-Electronics Review, pp. 34-37 (Feb. 1994).
"Acoustic Surface Wave Velocity Perturbations in LiNbO.sub.3 by Diffusion of metals", by Schmidt, R. V., Appl. Phys. Lett., vol. 27, No. 1, pp. 8-10 (Jul. 1, 1975).
Low-Loss Single-Mode Optical Waveguides and Efficient High-Speed Modulators of LiNb.sub.x Ta.sub.1-x O.sub.3 on LiTaO.sub.3, by Hammer, J.M. et al., Appl. Physics Lett., vol. 24, No. 11, pp. 545-547 (Jun. 1, 1974).
"LiNbO.sub.3 Acousto-Optic Tunable Filter Module with Built-In Temperature Control Function", by Nakaya, K. et al., 1997 Electronic Information Communications Society General Meeting, pp. 1-5.
"Acousto-Optic Tunable Filter Using Focused Surface Acoustic Waves on X-Cut LiNbO.sub.3 with Correction of Biased Propagation", by Hosoi, T., et al., 1997 Electronic Information Communications Soc. General Meeting, pp. 6-11.
"Metal-Diffused Optical Waveguides in LiNbO.sub.3 ", by Schmidt, R. V., Appl. Phys. Lett., vol. 25, No. 8, pp. 458-460 (Oct. 15, 1974).
"Fabrication of Optical Waveguiding Layer in LiTaO.sub.3 by Cu Diffusion", by Noda, J. et al., Appl. Phys. Lett., vol. 25, No. 5 pp. 308-310 (Sep. 1, 1974).
"Optical Networking", by Al-Salameh, D. Y. et al., Bell Labs Technical Journal, vol. 3, No. 1 pp. 39-61 (Jan.-Mar. 1988).
"Surface Acoustic Wave Filters", by Rosenberg, R. L., Miniaturized and Integrated Filters, Edited by Mitra, S, K. and Kurth, C. F., Published by John Wiley & Sons, pp. 329-373.
Lucent Technologies - Inc.
Palmer Phan T. H.
Rittman Scott J.
LandOfFree
System comprising acousto-optic tunable filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System comprising acousto-optic tunable filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System comprising acousto-optic tunable filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2343219