Little Optics offers two architectures for time delay circuits: (1) a multi-stage programmable delay line up to 64 bits and (2) an unbalanced Mach-Zehnder interferometer with differential path lengths up to 2 meters. These devices are fabricated on Little Optics' patented high index glass platform (i.e., core/clad index contrast ratio up to 25%), resulting in hundreds of die per 6" wafer.
Compared with conventional low index processes, benefits of the HydexTM material system are:
- Increase of optical path length up to 1000x
- Decrease in chip size by 10-50x
- Flexible "pick and place" stepper lithography techniques that allow stitching of long path length spirals to common device architecture
- Increased number of optical circuit elements per die
Little Optics Inc.