Optical signal processing has continued to evolve in response to new components and new problems. In the process, optical processors have sought to duplicate digital operations. The next logical step in algorithm evolution is the design of algorithms for continuous processors. We show here the first such quotation marks relation algorithm. The next logical direction for evolution of the hardware is to consider which, if any, of the components can be replaced by their electronic counterparts. We show here that all of its components can be replaced by electronic components and that the resulting processor has numerous advantages over its optical counterpart. As evolution is hard to describe where it is happening, we do not present these as the final stages of software and hardware but as interesting new directions.

1.
The earliest phases of this work is given in:
(a)
R.A.
Heinz
,
J.O.
Artman
, and
S.H.
Lee
(
1970
),
Applied Optics
, Vol.
9
,
2161
2168
.
[PubMed]
(b)
D.P.
Jablonski
,
R.A.
Heinz
, and
J.O.
Artman
(
1972
),
Applied Optics
, Vol.
11
,
174
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.
[PubMed]
(c)
R.P.
Bocker
(
1974
),
Applied Optics
, Vol.
13
,
1670
1676
.
[PubMed]
2.
The most recent work developed from
J.W.
Goodman
,
A.R.
Dias
, and
L.m.
Woody
(
1978
),
Optics Letters
, Vol.
2
,
1
3
.
3.
H.J.
Caulfield
,
D.
Dvore
,
J.W.
Goodman
, and
W.T.
Rhodes
(
1981
),
Applied Optics
, Vol.
20
,
2263
.
4.
B.V.K.
Vijaya Kuman
and
D.
Casasent
(
1981
),
Applied Optics
, Vol.
20
,
3707
3710
.
5.
H.J.
Caulfield
,
W.T.
Rhodes
,
M.J.
Foster
, and
Sam
Horvitz
(
1981
),
Optics Communications
, Vol.
40
,
North-Holland Publishing
,
Amsterdam
,
86
90
.
6.
M.
Carlotto
and
D.
Casasent
(
1982
),
Applied Optics
, Vol.
21
,
147
152
.
7.
J.W.
Goodman
and
M.S.
Song
(
1982
),
Applied Optics
, Vol.
21
,
502
.
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