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Microholographic Optical Data Storage with Spatial Mode Multiplexing

2013; Institute of Physics; Volume: 52; Issue: 9S2 Linguagem: Inglês

10.7567/jjap.52.09ld02

1347-4065

Hideharu Mikami, Koichi Watanabe,

Advanced Fiber Laser Technologies

Microholographic optical data storage is a promising candidate for next-generation optical disc systems because of its potential huge capacity. We proposed and demonstrated a new novel multiplexing technique for microholographic optical data storage using spatial modes of an optical beam to enhance data capacity. Numerical simulation was performed to validate the proposal and it was estimated that the net increase of data capacity by applying two- and four-mode multiplexing with Hermite–Gaussian modes was 1.3 and 1.7 times, respectively. A proof-of-principle experiment for two-mode multiplexing was performed by using spatial modes equivalent to Laguerre–Gaussian modes and it was demonstrated that signal output was selectively obtained by choosing an appropriate spatial mode for reference light of phase-diversity homodyne detection. Because the proposed technique can be applied in conjunction with other multiplexing and multilevel techniques, it is expected to greatly increase the possible applications of future optical disc systems.