Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2006-08-08
2006-08-08
Font, Frank G. (Department: 2883)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C385S008000, C385S040000
Reexamination Certificate
active
07088874
ABSTRACT:
An electro-optical device capable of modulating the amplitude or phase of an optical output in response to an electrical data or control signal, or of switching it, has reduced frequency-dependence and a better combination of operating voltage and bandwidth. It comprises a body of electro-optically active material, waveguides for passing light through the body, and electrodes for applying an electric field with a frequency in the microwave region to the body, and its transverse geometry is such as to maintain adequate phase velocity matching between optical and microwave frequencies. There is a discontinuity in either the body or at least one of the electrodes such that the direction of the electro-optic effect is reversed for a portion of the length of the device at or near its downstream end.The result of such a discontinuity (in combination with phase velocity matching) is that the device operates in three successive zones: in the upstream zone, desirable phase change is induced for all frequencies in the bandwidth of the device; in the middle zone, desirable phase change is induced for frequencies in the upper part of the bandwidth, but phase change in the lower frequencies becomes excessive; while in the downstream zone, there is no significant phase change in the higher frequencies but the excess change at lower frequencies is reversed.
REFERENCES:
patent: 4709978 (1987-12-01), Jackel
patent: 4797641 (1989-01-01), Djupsjobacka
patent: 5005932 (1991-04-01), Schaffner et al.
patent: 5278924 (1994-01-01), Schaffner
“Bandpass Traveling-Wave Mach-zehnder Modulator in LiNbO3 with Domain Reversal” W. Wang, et al, IEEE Photonics Technology Letters, Vo. 9, No. 5, May 1997.
“First-order quasi-phase matched LINbO3waveguide periodically poled by applying an external field for efficient blue second-harmonic generation” M. Yamada, et al Applied Physics Letters 62 (5) Feb. 1, 1993 pp. 435-436.
“A Review of Lithium Niobate Modulators for Fiber-Optic Communications Systems” E. L. Wooten, et al IEEE Journal of Selected Topics in Quantum Electronics vol. 6, No. 1, Jan./Feb. 2000 pp. 69-82.
“Modeling and Optimization of Traveling-Wave LiNbO3Interferometric Modulators” H. Chung, et al IEEE Journal of Quantum Electronics, Vo. 27, No. 3, Mar. 1991 pp. 608-617.
“Wide-bandwidth high-frequency electro-optic modulator based on periodically poled LiNbO3” Y. Lu, et al Applied physics Letters, vol. 78, No. 8 Feb. 19, 2001, pp. 1035-1037.
“Novel Type of Baseband Phase-Reversal Electrode For Optical Modulators with Linear Phase Response” A. Djupsjobacka Electronics Letters, 26 Mar. 1, 1990, No. 5 pp. 318-320.
“Bandpass Traveling-Wave Mach-Zehnder Modulator in LiNbO3with Domain Reversal” W. Wang, et al IEEE Photonics Technology Letters, Vo. 9, No. 5, May 1997.
Belmonte Michele
Orio Massimo
Pruneri Valerio
Corning Incorporated
Font Frank G.
Mooney Michael P.
Paglierani Ronald J.
LandOfFree
Electro-optic devices, including modulators and 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 Electro-optic devices, including modulators and switches, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro-optic devices, including modulators and switches will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3693863