Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1991-08-29
1992-12-22
Lerner, Martin
Optical: systems and elements
Holographic system or element
Having particular recording medium
359306, 359310, 359561, 364822, 364824, G02F 111, G03H 102, G06E 300
Patent
active
051737906
ABSTRACT:
An adaptive filter having a correlation weighting structue having a single Bragg cell, acting as a tapped delay line and having an input and an output, the Bragg cell intensity modulating a write laser beam for computing correlation values, and modulating a read laser field strength for multiplying the correlation values by delayed signal values. A photorefractive element is arranged such that substantial portions of diffracted and undiffracted light components from the single Bragg cell overlap within the photorefractive element. A write laser is intensity modulated by an error signal to produce an optical write signal that is received at the photorefractive element input and which writes correlation coefficients in the photorefractive element. A read laser produces a light signal, a portion of which is diffracted by the single Bragg cell, the portion of the light signal that is not diffracted by the single Bragg cell being partially diffracted by the photorefractive element. A photodetector having an input receives the portion of the light signal that is diffracted by the single Bragg cell and the portion of the read laser light signal that is diffracted by the photorefractive crystal, the photodetector output producing a filtered signal. The read laser light is isolated from the write laser light such that only the read laser light reaches the photodetector.
REFERENCES:
patent: 4696533 (1987-09-01), Kingston et al.
patent: 4726639 (1988-02-01), Brody
patent: 4865427 (1989-09-01), Kingston et al.
patent: 4877297 (1989-10-01), Yeh
Hong et al., "Photorefractive Crystals as Adaptive Elements in Acoustooptic Filters", SPIE vol. 789, Optical Technology for Microwave Applications (1987), pp. 136 to 144.
Harris Corporation
Lerner Martin
LandOfFree
Adaptive filter with correlation weighting structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive filter with correlation weighting structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive filter with correlation weighting structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-977680