Phase modulated high density collinear holographic data storage system with phase-retrieval reference beam locking and orthogonal reference encoding

Optics Express
Jinpeng LiuXiaodi Tan

Abstract

A novel phase modulation method for holographic data storage with phase-retrieval reference beam locking is proposed and incorporated into an amplitude-encoding collinear holographic storage system. Unlike the conventional phase retrieval method, the proposed method locks the data page and the corresponding phase-retrieval interference beam together at the same location with a sequential recording process, which eliminates piezoelectric elements, phase shift arrays and extra interference beams, making the system more compact and phase retrieval easier. To evaluate our proposed phase modulation method, we recorded and then recovered data pages with multilevel phase modulation using two spatial light modulators experimentally. For 4-level, 8-level, and 16-level phase modulation, we achieved the bit error rate (BER) of 0.3%, 1.5% and 6.6% respectively. To further improve data storage density, an orthogonal reference encoding multiplexing method at the same position of medium is also proposed and validated experimentally. We increased the code rate of pure 3/16 amplitude encoding method from 0.5 up to 1.0 and 1.5 using 4-level and 8-level phase modulation respectively.

References

May 11, 2005·Applied Optics·Hideyoshi HorimaiJun Li
Dec 19, 2007·Optics Letters·G W BurrM A Neifeld
Feb 28, 2008·Applied Optics·H GuentherR Neurgaonkar
Nov 26, 2007·Optics Express·Kenji TanakaKenjiro Watanabe
May 10, 1996·Applied Optics·G BarbastathisD Psaltis
Jul 13, 2011·Optics Express·Atsushi OkamotoKunihiro Sato
Mar 14, 2013·Optics Express·Xinchen PanJianqiang Zhu

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