Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1997-10-01
2000-04-18
Lee, John D.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 24, 385 27, 385 32, 385 40, 385 50, G02B 6293
Patent
active
060524952
ABSTRACT:
The invention provides an optical switch and modulator which uses a closed loop optical resonator. The optical resonator is a dielectric cavity whose primary function is to store optical power. Various structures are possible, and a particularly advantageous one is a ring shaped cavity. The wavelength response at the output port of a ring resonator side coupled to two waveguides is determined by the details of the resonator, and the coupling between the resonator and the waveguides. By coupling to adjacent resonators, the modulator response can be improved over that of a single resonator. One such improvement is in modulator efficiency, which is defined as the ratio of the change in optical intensity at the output, to a change in absorption in the ring waveguides. Absorption is used for switching and modulation without incurring significant optical attenuation. Another improvement involves making the resonance insensitive to small deviations in wavelength or index change. The latter improves fabrication tolerances and compensates for possible drift of the signal wavelength. Collectively, the behavior of multiple coupled resonators yields higher order responses.
REFERENCES:
patent: 3558213 (1971-01-01), Marcatili
patent: 3589794 (1971-06-01), Marcatili
patent: 3963998 (1976-06-01), Richter
patent: 4097826 (1978-06-01), Knox et al.
patent: 4282499 (1981-08-01), DeFonzo
patent: 4630885 (1986-12-01), Haavisto
patent: 4695121 (1987-09-01), Mahapatra et al.
patent: 4720160 (1988-01-01), Hicks, Jr.
patent: 5158908 (1992-10-01), Blonder et al.
patent: 5457760 (1995-10-01), Mizrahi
patent: 5526153 (1996-06-01), Glance
patent: 5790583 (1998-08-01), Ho
patent: 5825799 (1998-10-01), Ho et al.
patent: 5878070 (1999-03-01), Ho et al.
Little et al., "Microring Resonator Channel Dropping Filters," Journal of Lightwave Technology, vol. 15 No. 6 (Jun. 1997):998-1005.
Zhang et al., IEEE Photonics Technology Letters, "Directional Light Output form Photonic-Wire Microcavity Semiconductor Lasers", vol. 8, No. 8, pp. 968-970, Aug. 1996.
Adar et al., Applied Phys. Lett., "Measurement of very low-loss silica on silicon waveguides with a ring resonator", vol. 58, No. 5, pp. 444-445, Feb. 4, 1991.
Little, et al., IEEE Lasers and Electro-Optics Society 1995 Annual Meeting (8th Annual Meeting), "Micro-Ring Resonator Channel Dropping Filters", Conference Proceedings vol. 2, pp. 233-234, Oct. 30-Nov. 2, 1995.
Foresi James S.
Haus Hermann A.
Little Brent E.
Lee John D.
Massachusetts Institute of Technology
Stahl Michael J.
LandOfFree
Resonator modulators and wavelength routing switches does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resonator modulators and wavelength routing switches, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resonator modulators and wavelength routing switches will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2343210