At grade optical crossover for monolithic optial circuits

Details At grade optical crossover for monolithic optial circuits At grade optical crossover for monolithic optial circuits

1980-04-07

1983-05-10

Lee, John D.

350 9615, G02B 5174

Patent

active

043826555

ABSTRACT:
Planar optical circuits may be made to cross through each other, (thus eliminating extra steps required to fabricate elevated, nonintersecting crossovers) by control of the dimensions of the crossing light conductors (10, 12) to be significantly greater than d=0.89.lambda. and the angle of crossing as nearly 90.degree. as conveniently possible. A light trap may be provided just ahead of the intersection to trap any light being reflected in the source conductor at angles greater than about 45.degree.. The light trap may take the form of triangular shaped portions (16a, 16b) on each side of the source conductor with the far side of the triangular portion receiving incident light at an angle so that incident light will be reflected to the other side, or it may take the form of windows (18a, 18b) in place of the triangular portions. Planar optical circuit boards (21-23) may be fabricated and stacked to form a keyboard (20) with intersecting conductors (26-29) and "keyholes" (0-9) where conductors merge at the broad side of the circuit boards. These keyholes may be prearranged to form an array or matrix of keyholes.

REFERENCES:
patent: 3558213 (1971-01-01), Marcatili
patent: 3662830 (1972-05-01), Martin
patent: 3663194 (1972-05-01), Greenstein et al.
patent: 3767445 (1973-10-01), Chandross et al.
patent: 3809732 (1974-05-01), Chandross et al.
patent: 3953620 (1976-04-01), Chandross et al.
patent: 4019051 (1977-04-01), Miller
patent: 4130342 (1978-12-01), McMahon
Rodriguez, "Fast DMOS Optocouplers Beat SSRs in Speed and Reed Relays in Performance", Electronic Design, vol. 28, No. 7, Mar. 1980, pp. 60-63.

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