摘要:
A holographic memory device is described which records and reproduces binary image data by irradiating a holographic recording medium with signal light and reference light. The holographic memory device includes a system for aligning polarization of the signal light and reference light on the holographic recording medium by guiding the signal light and the reference light to be coaxially opposed. The holographic memory device further includes a random-phase modulation multiplex recorder and spatial-shift multiplex recorder that, together with the system for aligning polarization, significantly enhances recording density and improves recording capacity.
摘要:
A holographic memory in which a disk recording medium having a mechanism for operating an optical pick-up system is used, signal and reference light beams are so coaxially directed as to be opposed, the polarization planes of the signal with each other on the disk recording medium and which is well compatible with existing techniques and high in cost performance when manufactured as a product. The reflection holographic memory comprises random-phase modulation multiplex recording means disposed in the light guide of the signal and/or reference light beams and a spatial-shift multiplex recording means so as to increase the recording capacity. Signals are recorded in the thickness direction of the disk so as to further increase the recoding capacity. That is, by combining random-phase modulation multiplex recording and spatial-shift multiplex recording, the recording density is enhanced tens to hundreds times to improve the recording capacity of multilayer type by using a micro recording area of the reflection hologram. Simultaneously, the encryption effect can be produced by the random-phase modulation multiplex recording.
摘要:
Provided is an information encoding method and a holographic memory device which increase the amount of information per page of a holographic memory and reduce the bit error rate to ensure a larger multiplexing number. The holographic memory information encoding method expresses information of signal page data in a holographic memory as a multi-stage data using different resolution by block coding, and superimposes each data on a single page of signal page data. The multi-stage data using different resolution is realized by light amplitude data and phase data. The amplitude data is divided by area through block coding. When n odd-numbered ON bits exist in a divided area of the phase data, a phase of 2πs/n (where n and s are natural numbers) is imparted as s-th phase information to one value of binary data, and the same phase is imparted to the other value of binary data.
摘要翻译:提供了一种信息编码方法和全息存储装置,其增加全息存储器的每页信息量并降低误码率,以确保更大的复用数。 全息存储器信息编码方法将全息存储器中的信号页数据的信息表示为使用不同分辨率的块编码的多级数据,并将每个数据叠加在单页信号页数据上。 使用不同分辨率的多级数据由光幅数据和相位数据实现。 通过块编码将振幅数据除以面积。 当相位数据的分割区域存在n个奇数ON位时,将2&pgr / s / n(其中n和s为自然数)的相位作为第二相位信息赋予二值数据的一个值,并且 对二进制数据的其他值赋予相同的相位。
摘要:
Provided is an information encoding method and a holographic memory device which increase the amount of information per page of a holographic memory and reduce the bit error rate to ensure a larger multiplexing number. The holographic memory information encoding method expresses information of signal page data in a holographic memory as a multi-stage data using different resolution by block coding, and superimposes each data on a single page of signal page data. The multi-stage data using different resolution is realized by light amplitude data and phase data. The amplitude data is divided by area through block coding. When n odd-numbered ON bits exist in a divided area of the phase data, a phase of 2πs/n (where n and s are natural numbers) is imparted as s-th phase information to one value of binary data, and the same phase is imparted to the other value of binary data.
摘要翻译:提供了一种信息编码方法和全息存储装置,其增加全息存储器的每页信息量并降低误码率,以确保更大的复用数。 全息存储器信息编码方法将全息存储器中的信号页数据的信息表示为使用不同分辨率的块编码的多级数据,并将每个数据叠加在单页信号页数据上。 使用不同分辨率的多级数据由光幅数据和相位数据实现。 通过块编码将振幅数据除以面积。 当相位数据的分割区域存在n个奇数ON位时,将2&pgr / s / n(其中n和s为自然数)的相位作为第二相位信息赋予二值数据的一个值,并且 对二进制数据的其他值赋予相同的相位。
摘要:
The present invention describes an ultrafast secure data communication system that can link remote users to an encrypted database with holographic-stored data and a high security and ultrafast transfer rate.