Summary form only given. An analog electric (current or voltage) signal to be converted is fed to a multi-electrode, wavelength tunable diode laser, the output wavelength of which is uniquely determined by the signal. A microscope lens makes the Gaussian laser output beam converge weakly. The laser beam impinges on a blazed grating, the beam diffracted from it falling upon one in an array of diffractive elements. The widths of the array elements are approximately the same as the diameter of the focused beam incident on them. The diffractive array elements are designed to fan out beams into individual spot patterns. The maximum number of spots in a pattern, n, equals the number of bits the analog signal is to be resolved into. All the fanout array elements produce spots at the same fixed locations, where n individual detectors are positioned. Through this arrangement, a particular analog electric signal amplitude is first converted into a unique wavelength, a fact which makes the laser beam strike a particular diffractive element in the array. The array element in turn produces a unique spot pattern (bit-code) on the detectors, which are read out in parallel.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analog-to-digital conversion using diffractive optics


    Contributors:
    Johansson, M. (author) / Lofving, B. (author) / Hard, S. (author) / Thylen, L. (author) / Mokhtari, M. (author) / Westergren, U. (author) / Pala, C. (author)


    Publication date :

    2001-01-01


    Size :

    129768 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    TuO1 Analog-to-Digital Conversion using Diffractive Optics

    IEEE | British Library Conference Proceedings | 2001


    Diffractive Optics

    Guenther, B. D. ;Hardwick, D. ;Li, C. | British Library Online Contents | 2004


    Diffractive Optics

    British Library Online Contents | 1997


    Diffractive optics and micro-optics

    British Library Conference Proceedings | 1996


    Replicated Diffractive Optics and Micro-Optics

    Gale, M. T. | British Library Online Contents | 2003