US 2021/0201949 A1 · MULTIPLEXING METHOD FOR INCREASING STORAGE CAPACITY IN DISC-TYPE HOLOGRAPHIC STORAGE MEDIUM

Abstract

The present invention relates to the technical field of holographic multiplexing storage, and in particular, to a multiplexing method for increasing storage capacity in a disc-type holographic storage medium. According to the method disclosed by the present invention, holograms with different grating vector directions can be overwritten and recorded in the same storage medium according to Bragg selection characteristics of volume holographic records, and the obtained holograms do not affect each other. According to the method disclosed by the present invention, on the premise of ensuring low crosstalk between data pages, the multiplexing number of shift multiplexing storage is increased by using a cross-shift multiplexing method, and the storage density is improved.

Claims17

Dependent claims

A multiplexing method for increasing storage capacity in a disc-type holographic storage medium, which is a cross-shift multiplex recording and reproducing method, comprising the following steps:

S1. forming a holographic field at a recording position in the storage medium by a reference light beam and a signal light beam carrying input information, so as to record signal information;
S2. using a linear shift multiplexing method, and repeating the process of step S1 to perform shift multiplex recording on the entire storage medium;
S3. changing the relative orientation between the center of the storage medium and an optical head, and repeating steps S1 and S2 to record holograms with different grating vector directions at the same position on the storage medium;
S4. performing multiplex recording by using the circumferential rotation of the storage medium, and performing multiplex recording on two positions on the surface of the storage medium that are symmetrical around the center of a circle to obtain holograms with different grating vector directions;
and
S5. using the same beam of reference light to read the input signal information at the corresponding recording position.

3 more elements

A multiplexing method for increasing storage capacity in a disc-type holographic storage medium, wherein in the multiplex recording process, the method comprises the following steps:

S1. forming a holographic field at a recording position in the storage medium by a reference light beam and a signal light beam, so as to record signal information;
S2. using a linear shift multiplexing method, and repeating the process of step S1 to perform shift multiplex recording on the entire storage medium;
S3. changing the relative orientation between the center of the storage medium and an optical head, and repeating steps S1 and S2 to record holograms with different grating vector directions at the same position on the storage medium.

A disc-type holographic storage medium recording and reproducing device for recording and reproducing a signal on a storage medium, comprising:

a recording mechanism, configured to generate signal light and reference light, wherein the signal light and the reference light interfere in the storage medium to generate holograms;
a translation mechanism, configured to drive the storage medium to translate from inside to outside or from outside to inside;
and
a rotating mechanism, configured to drive the storage medium to rotate about the center of the storage medium;
wherein
the translational motion and the rotational motion of the storage medium enable the recording mechanism to perform linear shift multiplexing and circumferential shift multiplexing on the storage medium, so that holograms with different grating vector directions can be recorded at the same position on the storage medium.

3 more elements

Dependencies are inferred from the claim text.

Multiplexing method for increasing storage capacity in disc-type holographic storage medium

Life of this patent

Multiplexing method for increasing storage capacity in disc-type holographic storage medium

Life of this patent

Abstract

Claims17