New Coaxial Interference Method for Consumer Holographic Memory

This work proposes a page differential intensity amplification for optical signal amplification in the intensity multiplexing holographic data storage system. The proposed method detects the signals of four cameras and reconstructs the intensity difference between two pages. The reconstructed intensity difference is amplified by the ratio of the readout beam amplitude to the local oscillator beam amplitude. Experiments showed that the proposed method can achieve a more stable signal amplification than the conventional amplification technique. Moreover, signal detection is possible with half the light intensity of the readout beam compared to the conventional direct detection method. This corresponds to 1.4 times the recording capacity increase if the capacity is limited by M/#, or the reduction to half the readout exposure time.

“…( 13), the phase term is eliminated by using the sin and cos components in Eqs. (11) and (12). Because there is no phase term in Eq.…”

Section: X Y P I X Y P I X Y P B a X Y P A X Y Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical signal amplification between pages for holographic data storage

Yamazaki

Yamaguchi

2022

“…Needs of high density optical storage have been increasing since high capacity multimedia contents, such as 3D video contents and social media services become popular. Various optical storage technologies have been developed for high density storage including holographic data storage, [1][2][3] nearfield optical storage, [4][5][6] super resolution optical storage, [7][8][9] and two photon absorption storage 10,11) for next generation high density optical recording technologies. Recently, several studies on multi-layer Blu-ray disc (BD) system reported that the media consisting of three or four layers achieved over 100 Gbyte.…”

Section: Introductionmentioning

confidence: 99%

High Density Recording with Guided-Layer Media

Kwon¹,

Han²,

Kim³

et al. 2012

Recording characteristics of guided-layer media consisting of planar recording layer and land/groove patterned guided-layer were investigated. Guided-media can be operated with a focusing servo and a tracking servo on the planar recording layer and the guided-layer, respectively. Recording properties using not only two blue lasers but also one blue and one red laser were measured. The jitter of about 8% was obtained from the planar recording layer on the guided-layer using two blue lasers system. Even though the jitter was not obtained, a similar performance to the previous result was observed with the blue laser and the red laser system. Though these experimental results, the possibility of high recording density with increasing data transfer rate could be confirmed.

“…[1][2][3][4][5] Recently, as a new dimension in the HDSS, a collinear holographic memory (CHM) has been developed to enhance the compatibility with a conventional optical disc drive. [6][7][8] Then, as a unique feature of the CHM, recording with collinear shift multiplexing and a reading process are executed through disc rotation, which makes it possible to achieve high data density and high data transfer rate simultaneously while maintaining technique compatibility. Thus far, Tanaka et al 9) have reported a coaxial holographic recording system with a storage density of 450 Gbyte/disc, which is nearly twenty times larger than that of a BD restricted by a two-dimensional diffraction limit.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Collinear Holographic Memory with Movable Random Phase Mask

Shibukawa

Okamoto

Tomita

et al. 2011

We proposed a new multilayer collinear holographic memory (MCHM) with a movable random phase mask that can act as an interlayer crosstalk reducer. First, to clarify the feasibility of our proposed device, we showed that it has an extremely sharp shift selectivity along the thickness direction of medium of nearly 5.0 µm when the numerical aperture of the objective lens is 0.60. Next, we demonstrated that the utilization of the movable random phase mask can suppress interlayer crosstalk sufficiently, resulting in the improvement in the quality of reconstructed signals. Moreover, we revealed that the MCHM, in which the parallel use of a multilayered technique and collinear shift multiplexing is performed, brings out the medium potential sufficiently in terms of signal to noise ratio and medium dynamic range consumption. Finally, we verified that the MCHM can achieve a nearly 2 times larger data density at least compared with a conventional collinear holographic memory.