Coded data generation or conversion – Analog to or from digital conversion – Using optical device
Reexamination Certificate
2002-06-26
2004-03-30
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Using optical device,
C341S155000
Reexamination Certificate
active
06714149
ABSTRACT:
TECHNICAL FIELD
A field of the invention is signal conversion. The invention is directed to the digitization of analog signals.
BACKGROUND ART
Conversion of analog signals into digital signals is a fundamental task necessary in uncountable varieties of electronic devices. Conventional analog to digital converters (ADCs) employ electronic circuitry and repetitive processing to define the digital value of an analog signal. Higher frequency signals require higher sampling rates, i.e., the rate at which an analog signal is measured for the purpose of determining a corresponding digital value. One guideline is known as the Nyquist criteria. The Nyquist criteria requires that the digital sampling rate be greater than two times the analog frequency in order to faithfully reproduce the analog signal from the digital values. In practice, the sampling rate is typically chosen to be 5 times the analog frequency to be sampled. As frequencies of interest become high, e.g., in the tens of GigaHertz, conventional electronic techniques may not meet a desired rate of sampling. Even at lower frequencies, the electronics for a high quality analog to digital conversion may become complex and expensive.
DISCLOSURE OF THE INVENTION
In the invention, an analog signal is converted to an optical deflection. Conversion may be conducted at the rate of change permitted by the lower of the speed of deflection or rate of optical pulses delivered to the deflector. In preferred embodiments, an N-bit parallel output is obtained. A particularly preferred embodiment patterns the light beam with a spatial filter into an N-bit binary light pattern that is then collected and sensed by optical detectors.
REFERENCES:
patent: 5010346 (1991-04-01), Hamilton et al.
patent: 5039988 (1991-08-01), Hong
patent: 6100831 (2000-08-01), Frankel
patent: 6118397 (2000-09-01), Heflinger
patent: 6188342 (2001-02-01), Gallo
patent: 6219172 (2001-04-01), Yariv
patent: 6246350 (2001-06-01), Yap
patent: 6525682 (2003-02-01), Yap
patent: 1014588 (2000-06-01), None
Marc Currie, Thomas R. Clark, and Paul J. Matthews, “Photonic Analog-to-Digital Conversion by Distributed Phase Modulation”, IEEE Photonics Technology Letters, vol. 12, No. 12, Dec. 2000, pp. 1689-1691.
Warren Marwood, A. Peter Willis, Petar B. Atanackovic, Ken J. Grant and Ian G. Fuss, “A Wide-Band, High Precision Opto-electronic Analog-to-Digital Converter”, Proceedings of International Conference on Signal Processing Applications and Technology, http://www.icspat.com/papers/230mfi.pdf, pp.486-490. (no date).
Thomas R. Clark Jr., “High-Performance Photonic Analog-to-Digital Converters”, pp. WV1-1-WV1-3, Technical Digest, Mar. 21, 2001, Optical Fiber Communication Conference and Exhibit, Mar. 17-22, 2001, Anaheim Convention Center, Anaheim, California.
T. Saida, K. Okamoto, H. Yamada, K. Takiguchi, T. Shibata, A. Sugita, and K. Uchiyama, “Optical pulse pattern recognition circuit based on an optical digital-to-analog converter on a Planar Lightwave Circuit”, pp. WY2-1-WY2-3, Technical Digest, Mar. 21, 2001, Optical Fiber Communication Conference and Exhibit, Mar. 17-22, 2001, Anaheim Convention Center, Anaheim, California.
Greer Burns & Crain Ltd.
Young Brian
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