Eric S. Bjornson

High-transfer-rate high-capacity holographic disk data-storage system

We describe the design and implementation of a high-data-rate high-capacity digital holographic storage disk system. Various system design trade-offs that affect density and data-rate performance are described and analyzed. In the demonstration system that we describe, high-density holographic recording is achieved by use of high-resolution short-focal-length optics and correlation shift multiplexing in photopolymer disk media. Holographic channel decoding at a 1-Gbit/s data rate is performed by custom-built electronic hardware. A benchmark sustained optical data-transfer rate of 10 Gbits/s has been successfully demonstrated.

Digital quasi-phase-matched two-color nonvolatile holographic storage

Unwanted erasure during readout of holographic data can be reduced or eliminated by use of a different wavelength for reading than that which was used for writing. To prevent distortion and Bragg mismatch that would be unacceptable for digital data storage, one can format data to account for the wavelength difference. Techniques to format data and the results of this formatting are presented. Varying the formatting parameters is investigated to optimize diffraction efficiency.

Ultra-high transfer rate high capacity holographic disk digital data storage system

We describe a fully functional, hardware implemented, high data rate (1 Gbit/sec) high capacity digital holographic data storage photopolymer disk system. High density holographic recording is achieved using high-resolution short focal length optics and correlation shift multiplexing. Sustained data transfer rates as high as 10 Gbit/s in optical domain have been achieved.

High data rate (10 Gbit/sec) demonstration in holographic disk digital data storage system

Summary from only given. In digital holographic data storage data modulation coding, data interleaving, and error correction are usually implemented in addition to conventional holography and multiplexing. The performance of the holographic disk digital data storage system is determined by several major factors, most notably, by the optical parameters (such as the imaging NA), material performance (dynamic range or M/#, scattering, and thickness), as well as available laser power.

Recent work on network application layer: MioNet, the virtual workplace for small businesses

Small businesses must be extremely efficient and smartly leverage their resources, suppliers, and partners to successfully compete with larger firms. A successful small business requires a set of companies with interlocking business relationships that are dynamic and needs-based. There has been no software solution that creates a secure and flexible way to efficiently connect small business computer-based employees and partners. In this invited paper, we discuss MioNet, a secure and powerful data management platform which may provide millions of small businesses with a virtual workplace and help them to succeed.

Internet assisted laboratories: design, educational use, and pedagogical evaluation

We discuss the design considerations of Internet Assisted Laboratories (Ilabs), their educational use for teachers and students in the classroom and for homework, and the results of several pedagogical evaluations at Stanford University of remote optics Ilabs we have used since 1998.

Precompensated two-color digital holographic storage

By reading data in an angular multiplexed holographic storage system at a wavelength other than the wavelength used for writing, the problem of unwanted erasure can be prevented. By compensating data prior to recording, the mismatch resulting from the difference in reading and writing wavelengths may be minimized. Such a compensation technique was experimentally investigated by recording differentially encoded data within an Fe doped sample of LiNbO3 at a wavelength of 514 nm and recalling data using 488 nm. Our system demonstrated that the recording of compensated data allowed accurate readout with a raw bit error rate of .08%.