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Apparatus for evaluating a polynomial function using an array of optical modules
| Details |
Inventors: Verber, Carl M.;
Assignee: Battelle Development Corporation (Columbus, OH)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Methods and apparatus for providing an optical analog quantity proportional to ##EQU1## Input light (a.sub.4) of intensity proportional to a.sub.n is directed (21,31) to the input end of an nth optical module comprising a modulator (22) whose output light intensity is responsive to an electrical potential difference across it and a beam combiner (23). While the light is passing through the modulator (22), a potential difference (24) is applied across it such that the intensity of the output light from the modulator (22) is proportional to a.sub.n x, and this light (a.sub.4 x) is directed, through the beam combiner (23), to the output end of the optical module. Input light (a.sub.3) of intensity proportional to a.sub.n-1 is directed (25), via the beam combiner (23), to the output end of the optical module, to combine with the light from the modulator (22) so that the intensity of the output light (32) from the nth optical module is proportional to a.sub.n x+a.sub.n-1 ; this light is directed to the input end of an (n-1)th optical module essentially similar to the nth; and so on in the same manner; and finally to the first module, so that its output light has an intensity proportional to p(x). |
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DETAILED DESCRIPTION I claim: 1.
Apparatus for providing an optical analog intensity that is approximately proportional to the value of a polynomial function expressible in the form ##STR4## wherein p(x) is a function of x, x is any variable, n is any positive integer, the cooefficients, a.
sub.
i, are any constants, variables, or constants and variables; comprising: an electrooptic planar waveguide; a plurality, n+1, of integrated optical modules in the waveguide, each module comprising at its input end a modulator for receiving light travelling in a predetermined input direction and transmitting a controlled proportion thereof further in a predetermined output direction to the output end, and a beam combiner for receiving the light from the modulator and transmitting a predetermined proportion thereof further in the predetermined output direction and on through the output end of the module; the modulator comprising electrooptic diffractive means comprising a pair of electrodes for forming a Bragg grating therebetween, positioned with a direction of Bragg incidence approximately in the predetermined input direction, the first electrode comprising a first set of substantially straight and parallel, thin, elongate, electrically conductive members connected together at one end, and the second electrode comprising a second set of substantially straight and parallel, thin, elongate, electrically conductive members, interleaved with the first set, insulated therefrom, and connected together at the opposite end, so that when a first electrical potential is applied to the first electrode and a second electrical potential is applied to the second electrode the controlled portion of input light transmitted through the modulator is provided by a Bragg diffraction thereof in the predetermined output direction and has an intensity approximately proportional to a known function of the difference between the first and second electrical potentials; and the beam combiner comprising a fixed surface grating; diode laser means and collimating means for directing input light of intensity approximately proportional to the coefficient a
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