Frequency modulation-based folding optical analog-to-digital con

Details Frequency modulation-based folding optical analog-to-digital con Frequency modulation-based folding optical analog-to-digital con

1998-08-11

2000-05-16

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Using optical device,

341155, H03M 100

Patent

active

060643250

ABSTRACT:
A frequency modulation-based optical analog-to-digital converter utilizes a downward-folding, successive approximation approach. A series of stages is utilized to generate bits in the digital signal. In each stage, complementary low and high bandpass filters collectively cover a bandpass frequency range from a low frequency to a high frequency. The high frequency filtered signal from the high bandpass filter is observed to obtain a bit in the digital word. By performing the folding operations in the frequency domain, the converter avoids the difficult task of optical power subtraction, relying instead on frequency down-conversions. The high frequency filtered signal passed by the high bandpass filter is then downconverted and added to the low pass filter signal to generate a modulated signal for the next stage.

REFERENCES:
patent: 3778718 (1973-12-01), Bass et al.
patent: 4164714 (1979-08-01), Swanson
patent: 5555096 (1996-09-01), Yoo
patent: 5675428 (1997-10-01), Henmi

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