All-optical Read Only Memory Employing SOAs

Holographic read-only memory

We describe the three-dimensional holographic optical disc system for application as read-only memory. Several systems design issues are discussed including imaging optics, storage density, readout rate, and the alignment servo system. We demonstrate 40 bits=lm surface density and pixel-matched holographic data readout from a 12 cm disc spinning at 600 RPM.

High-Speed All-Optical Switches Based on Cascaded SOAs

All-optical gel memory.

We have studied the behavior of organic molecules (Rhodamine 640) that are encaged in a matrix synthesized by the sol-gel process. By applying a strong optical-polarized electric field, we can control the alignment of the molecules within the sample and locally create a birefringent effect. Using this sample in a Kerr experiment, we obtained a transmission ratio of 6%. Since the birefringent ef...

Automatic Data Layout with Read-Only Replication and Memory Constraints

Besides the algorithm selection, the data layout choice is the key intellectual step in writing an eecient HPF program. Although nding an eecient data layout fully automatically may not be possible in all cases, HPF users will need support during the diicult data layout selection process. In particular, this support is necessary if the user is not familiar with the characteristics of the target...

Interlayer cross talk in dual-layer read-only optical disks.

Volumetric optical disks comprising multiple data layers have been proposed to multiply recording density. Owing to the presence of out-of-focus data layers, interlayer cross talk is induced in readout. An optical model was developed to study the readout process and the effect of interlayer cross talk on the readout of dual-layer read-only optical disks. Schemes to improve the readout character...