Scalable, quantized, delay-line array based on nested, generaliz

Details Scalable, quantized, delay-line array based on nested, generaliz Scalable, quantized, delay-line array based on nested, generaliz

1998-02-05

1999-09-14

Bovernick, Rodney

Optical waveguides

With optical coupler

Switch

385 16, 385140, G02B 626

Patent

active

059534680

ABSTRACT:
The present invention is a compact, quantized, photonic delay-line array based on nested, generalized, spirals. The array includes N optical waveguides and is quantized in that consecutive waveguides can have their delays differ by the same delay difference design constant, D. Thus the delay for the n.sup.th delay line can be expressed as D.sub.n =D.sub.0 +n*D where D.sub.0 is the delay through the first waveguide and n=0, 1, 2, . . . ,(N-1). The arrays can be formed on a suitable substrate by a process permitting crossovers such as silica-on-silicon or optical polymer planar lightwave circuits. The nested waveguides are applied as single turn or multiturn generalized spirals with either sharp (mirrored) or rounded corners. The approach is scalable because N may range from 2 to over 64, limited only by the wafer (substrate) material and size, or D may range from a picosecond to well over a nanosecond with currently available substrates. With switching and optical combining such an optical waveguide array can provide one or several variable delays. In other applications, multiple, simultaneous optical channels can be given accurate increments of differential delay between channels.

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