Coded sequence travelling-wave optical modulator

Details Coded sequence travelling-wave optical modulator Coded sequence travelling-wave optical modulator

1987-01-20

1989-06-27

Moskowitz, Nelson

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

350 9614, 350376, 455616, H01S 300, G02B 626

Patent

active

048433500

ABSTRACT:
A travelling wave modulator in which the phase velocity of a first wave is modulated by a second travelling wave. Means are provided to alter the polarity of the second wave in accordance with a pseudorandom code. Barker codes and Golay codes are particularly suitable for improving the bandwidth-to-voltage ratio of the modulator over a comparable conventional modulator.

REFERENCES:
patent: H484 (1988-06-01), Holliday
Nazarathy et al. "Velocity-mismatch Compensation . . . "; J. Opt. Soc. Am. A., vol. 4, #6, pp. 1071-1079, 6/87.
Jung; K. M.; "Piezoelectric Multilayer Transducers . . . "; Ultrasonics, vol. 22, #2, pp. 61-68, 3/84, Abst. Only.
Electron. Lett., vol. 23, #4 pp. 172-174, 2/12/87 by Jungerman et al; "Coded Phase Reversal . . . ", Abst. only.
Nagarathy et al.; "Spread Spectrum Frequency . . . "; Abst. only. J. Lightwave Technol., vol. LT-5, #10, pp. 1433-1443, 10/87.
Holliday, A. M.; "Polarization Pulse Compression . . . "; abst., NTIS AD-A176635/1/XAB, 8/86, Tech. Report.
Maltese, P.; "Cross-Modulation . . . Matrix Displays"; Proc. S.I.D., vol. 216, #2, pp. 125-132, 1985. Abst. only.
A. Djupsjobacka, "Novel type of Broad-Band Traveling-Wave Integrated-Optic Modulator," Electron. Lett. 908-909 (1985).
D. Eraseme and M. G. F. Wilson, "Analysis and Optimization of Integrated-Optic Traveling-Wave Modulators Using Periodic and Non-Periodic Phase Reversals," Opt. Quantum Electron. 18, 203-211 (1986).
D. Eraseme and M. G. F. Wilson "Time-Domain Analysis of Phase-Reversal Traveling-Wave Integrated-Optics Modulators," Electron. Lett. 19, 1024-1026 (1986).
R. L. Jungerman, D. W. Dolfi, C. A. Johnsen, and M. Nazarathy, "Coded Phase Reversal LiNbO.sub.3 Modulator with Bandwidth Greater than 20 GHz at 1.3. um Wavelength," Electron, Lett. 23, 172-176 (1987).
R. V. Schmidt and H. Kogelnik, "Electro-Optically Switched Coupler with Stepped .DELTA..beta. Reversal Using Ti-Diffused LiNbO.sub.3 Waveguides," Appl. Phys. Lett. 503-506 (1976).
"Waveguide Electrooptic Modulators" by Rod C. Alferness; pp. 1121--1137.
"Velocity-Matching Techniques for Integrated Optic Traveling Wave Switch/Modulators" by Alferness, et al.; pp. 301-309.
"Novel Type of Broadband Travelling-Wave Integrated-Optic Modulator;" Electronics Letters, 9/26/85; vol. 21; No. 20 Phase Code Generators and Correlators; pp. 311-315.
"Complementary Series-IRE Transactions on Information Theory" by Golay, pp. 82-87.
Microwave Journal 1967 (Semi-Technical) "Pulse Sequences with Good Autocorrelation Properties"; pp. 63-67.

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