WO2023273185A1 - Optical fiber data storage device, and preparation method and demodulation method therefor - Google Patents

Abstract

The present invention provides a preparation method for an optical fiber data storage device, comprising the following steps: S1, processing data information to be stored and converting same into data of a unified number system; then according to a preset rule, converting same into a spatial distribution law of an optical fiber grating array along an axial direction of an optical fiber; and S2, according to the spatial distribution law of the optical fiber grating array obtained by S1, writing the optical fiber grating array in an optical fiber core by using a femtosecond laser, and writing and storing the data of the unified number system in the optical fiber grating array. In addition, the present application further provides a demodulation method for an optical fiber data storage device and an optical fiber data storage device. In the present application, the flexibility and accuracy of femtosecond laser processing is utilized, and preparation parameters may be flexibly changed by means of data preprocessing; on the premise of not destroying the original mechanical strength of the optical fiber, the automatic writing of large batches of data may be accurately achieved; and the data storage device prepared by means of the method is suitable for long-term storage in a strong magnetic field, high temperature, and other working environments.

Description

Optical fiber data memory, its preparation method and demodulation method technical field

The invention relates to the technical field of memory, in particular to an optical fiber data memory, a preparation method and a demodulation method thereof.

Background technique

Existing storage is generally magnetic storage or optical storage.

Magnetic memory uses the surface magnetic medium as the carrier of information recording, and realizes the storage of binary digital information through two different remanence states or the switch state of 0 or 1 represented by the direction of remanence.

technical problem

Magnetic memory is currently the most commonly used memory, but it has the following disadvantages: 1. Magnetic memory usually requires more mechanical and circuit systems, such as signal recording circuits, signal replay circuits, servo mechanical systems, etc., and the size of the system is relatively large. Due to the exponential growth of data, magnetic storage requires a large amount of space to store a large amount of data; 2. Magnetic storage has the problem of short life, and it is difficult for magnetic storage to meet this requirement for data that needs to be stored stably for a long time; 3. Magnetic storage usually Long-term power supply is required, which greatly increases the cost and power consumption of magnetic storage.

In traditional optical storage, a laser is used to produce structural changes in the recording layer of the optical disc, thereby changing the refractive index of a local area. When the light shines on it, there will be different reflected signals, which are then converted into digital signals of 0 or 1.

This type of optical storage combined with multi-dimensional multiplexing technology has achieved high storage density, but it still has some shortcomings: 1. Traditional optical storage devices cannot be stored under strong light to prevent light from affecting the storage material and internal information. ; 2. Because high temperature has a great influence on the materials of traditional optical storage, it cannot be stored and worked in a high temperature environment; 3. Because traditional optical storage is easy to wear and tear, it needs better mechanical protection during storage.

technical solution

In view of the shortcomings of the existing memory, the object of the present invention is to provide an optical fiber data memory, its preparation method and demodulation method.

A preparation method of an optical fiber data storage provided by the application comprises the following steps:

S1, process the data information that needs to be stored, and convert it into data of a unified number system; then convert it into the spatial distribution law of the fiber grating array along the fiber axis according to the preset rules;

S2, according to the spatial distribution law of the fiber grating array obtained in S1, use the femtosecond laser to write the fiber grating array in the fiber core, and write and save the data of the unified number system in the fiber grating array.

According to a method for preparing an optical fiber data storage provided in an embodiment of the present application, in the step S1, the data in the unified number system is multi-ary system data.

According to a preparation method of an optical fiber data storage provided by an embodiment of the present application, multi-ary encoding is realized by controlling the modulation intensity of different grating segments.

According to a preparation method of an optical fiber data storage provided by an embodiment of the present application, multi-ary encoding is realized by controlling the grating periods of different grating segments.

According to a manufacturing method of an optical fiber data memory provided by an embodiment of the present application, the fiber grating array includes a plurality of grating segments, one grating segment is used to define one bit of data, and the grating segment is composed of several gratings with the same period.

According to a method for preparing an optical fiber data storage provided by an embodiment of the present application, the optical fiber further includes a cladding layer outside the optical fiber core and a coating layer.

According to a method for manufacturing an optical fiber data storage provided in an embodiment of the present application, the fiber grating array is a line array structure or a point array structure.

The present application also provides a demodulation method of an optical fiber data storage, wherein the optical fiber data storage is obtained through the above-mentioned preparation method; the demodulation method includes:

S3, reading the time domain reflection signal of the optical fiber data storage through the time domain reflection signal detection terminal;

S4, using a demodulation program to process the obtained time-domain reflection signal, restore the written data information, and realize data demodulation of the fiber grating array.

According to a demodulation method of an optical fiber data storage provided in an embodiment of the present application, in the step S3, one end of the optical fiber data storage is connected to a time domain reflection signal detection terminal through an optical fiber jumper, and the time domain reflection signal The detection terminal is connected with the computer; the time domain reflection signal of the fiber grating array is detected and recorded by the time domain reflection signal detection terminal.

According to a demodulation method of an optical fiber data storage provided by an embodiment of the present application, in the step S4, the obtained time-domain reflection signal is processed through the demodulation program in the computer, and the data written in the fiber grating array is obtained. The data.

The present application also provides an optical fiber data storage, the optical fiber data storage includes an optical fiber and an information unit stored in the optical fiber; the information unit is a fiber grating array, and the data information of the information unit is written and saved by a femtosecond laser in a fiber grating array.

According to the optical fiber data storage provided by the embodiment of the present application, the optical fiber data storage is obtained by the above preparation method.

According to the optical fiber data storage provided by the embodiment of the present application, the optical fiber includes a fiber core; the data information of the information unit is stored in the fiber core in the form of a fiber grating array.

According to the optical fiber data storage provided by the embodiment of the present application, the fiber grating array includes a plurality of grating segments, one grating segment is used to define one bit of data, and the grating segment is composed of several gratings with the same period.

According to the optical fiber data storage provided by the embodiment of the present application, the intervals between the grating segments are fixed.

According to the optical fiber data storage provided by the embodiment of the present application, the one-bit data is multi-ary data.

According to the optical fiber data storage provided by the embodiment of the present application, the grating segments used to define the multi-ary data are grating segments with different modulation intensities.

According to the optical fiber data storage provided by the embodiment of the present application, the grating segments used to define the multi-ary data are grating segments with different grating periods.

According to the optical fiber data storage provided by the embodiment of the present application, the fiber grating array is a line array structure or a point array structure.

According to the optical fiber data storage provided by the embodiment of the present application, the optical fiber further includes a cladding layer and a coating layer.

Beneficial effect

This application utilizes the flexibility and accuracy of femtosecond laser processing to flexibly change the preparation parameters through data preprocessing; on the premise of not destroying the original mechanical strength of the optical fiber, it can accurately realize the automatic writing of large batches of data. Compared with the magnetic memory, the optical fiber data memory of the present application is based on the data storage method of the fiber grating array, and the size is small, and the fiber grating array processed by the femtosecond laser micromachining can realize high-density storage. Since the optical fiber itself is resistant to electromagnetic interference and the written fiber grating array is resistant to high temperature, the optical fiber data memory prepared by this method can be stored and worked stably in a strong magnetic field environment. Fiber Bragg grating arrays can be stored stably for a long time. During this process, there is no need to worry about the influence of temperature, humidity, etc. on the material, and there is no need for power supply. It can be used in scenarios such as big data storage and special information encryption that need to be stored for a long time, and can also be used as a means of storing important information in extreme environments. Therefore, the data can be stably stored in the fiber grating array, and the long-term use cost is lower for the types of data that need to be stably stored.

Traditional optical storage devices have strict requirements on external conditions such as light and temperature. In the optical fiber data memory of the present application, although the optical fiber grating device also responds to external conditions, it does not have a large impact on information writing and reading during data storage and demodulation. The fiber grating array based on femtosecond laser micromachining can work stably in a high temperature environment up to 800°C, thus expanding the usage scenarios of the fiber grating array data storage and reducing the restrictions on the working environment.

Description of drawings

Fig. 1 is the schematic diagram of a kind of optical fiber data storage of a specific embodiment of the present application;

Fig. 2 is a schematic diagram of an optical fiber data storage according to another specific embodiment of the present application;

Fig. 3 is a schematic structural diagram of the optical fiber data storage demodulation system of the present application.

Embodiments of the present invention

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail in conjunction with the accompanying drawings and exemplary embodiments referred to below. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

The application provides an optical fiber data storage, including an optical fiber, and an information unit located in the optical fiber. Wherein, the information unit in the specific embodiment of the present application is a fiber grating array (33), and data information is written and stored in the fiber grating array (33) by a femtosecond laser.

In the optical fiber data storage of the present application, the optical fiber includes a core (32) and a cladding (31). Specifically, information is directly written into the fiber core (32) by femtosecond laser, so that the data information of the information unit is stored in the fiber core (32) in the form of a fiber grating array (33).

In a specific embodiment of the present application, the fiber grating array (33) includes multiple grating segments (301), one grating segment (301) is used to define one bit of data, and the grating segment (301) is composed of several gratings with the same period.

In this application, the data information that needs to be stored can be processed first, and converted into data of a unified number system; according to the preset rules, the corresponding rules between the raster and the data information can be established. A fiber grating array (33) is used to record and save data information.

The data information of the unified number system is multi-ary system data, such as binary, quaternary, octal, etc. It can be understood that the multi-ary number system is not limited to this.

For example, the data information is converted into binary data, and the coding of the binary data is represented by binary 0 or 1. Use raster segments (301) to represent coded bits 0 or 1, and set specific rules for representing coded bit data with raster segments, such as several (N, N>=1) rasters as a group to represent 0 or 1.

Fig. 1 is a schematic diagram of an optical fiber data storage in a specific embodiment. Several gratings are a grating segment (301), and a grating segment (301) is a coded bit, representing 1. There are 6 such grating segments (301) in the fiber grating array (33) in Fig. 1, and the pitch (interval between coding bits) of the grating segments (301) is fixed. Each raster segment (301) (coded bit) occupies the same physical space length. The spatial distribution of the fiber grating array (33) represents a binary code 111 111.

FIG. 2 is a schematic diagram of an optical fiber data storage in another specific embodiment, and several gratings are a grating segment ( 301 ), denoting 1. The interval between the grating segments (301) (coding bits) is fixed, and there are 4 raster segments (301) in total. There are two non-raster areas, which means that the code bit represents data as 0. The fiber grating array (33) in Fig. 2 represents binary code 101 011.

Figures 1 and 2 are only one application of the fiber grating array (33) to express data information, and it can be understood that the corresponding rules between gratings and data information are not limited to this.

The gratings in the fiber grating array (33) can have a line array structure as shown in Figures and Figure 2, or can also be a point array structure.

The above system expresses data information through binary data, and represents 1 or 0 through presence or absence of spatial distribution of grating segments (301).

On this basis, the data information can also be converted into quaternary, octal and other data, and the encoding from binary to multi-ary can be realized by controlling the modulation intensity of different grating segments (301). On this basis, various combinations such as quaternary and octal can be realized through the strength of the reflected signal.

Therefore, this application can use grating segments (301) with different modulation intensities as storage segments, and use the intensity of grating reflection signals with different modulation intensities as a distinction to realize multi-ary storage such as quaternary and octal. The principle is that different grating segments ( 301 ) introduce different modulation quantities by means of different laser energies, etc., and the intensity of time-domain reflection signals will be different. By defining different reflected signal strength intervals as distinctions, the corresponding demodulation method is used for data recovery according to different strengths during demodulation. Due to the large number of grating periods, there are complex arrangements in the wavelength domain. Data encryption can be realized by defining data corresponding to different grating periods.

In this application, multi-ary encoding can also be realized by controlling the grating periods of different grating segments. The aforementioned grating segment (301) used to represent the coding bits of multi-ary data information may be a fiber grating with the same grating period. Alternatively, the storage density can be further optimized by using fiber gratings with different grating periods. Since fiber gratings with different grating periods will reflect light of different wavelengths, during demodulation, by adjusting the input wavelength of the time domain reflection signal detection terminal, the grating reflection signals of different periods are detected respectively, so as to use these signals to realize multi-ary system Storage, and finally realize the extraction and recovery of original data through the integration of multiple sets of data.

The application also provides a method for preparing an optical fiber data storage, comprising the following steps:

S1, processing the data information to be stored; converting it into the spatial distribution law of the fiber grating array (33) along the fiber axis;

S2, according to the spatial distribution law of the fiber grating array (33) obtained in S1, write the fiber grating array (33) in the fiber core by using a femtosecond laser.

In the above step S1, the data information to be stored is processed and converted into data of a unified number system; and then converted into the spatial distribution law of the fiber grating array (33) along the fiber axis according to preset rules.

In the above step S1, the information data to be stored is analyzed, and the data to be stored is unified into multi-ary system data, such as binary, quaternary, octal, etc.

Taking binary as an example, the binary sequence is represented by binary 0 or 1; this represents the writing sequence and spatial axial distribution of the fiber grating array (33), thereby converting the binary data into the spatial distribution law of the fiber axial grating array, The preparation parameters of the fiber grating array (33) are obtained. Information data in other bases needs to be converted into binary representation. In the fiber grating array (33), several gratings are used as a group to represent one bit of data, and finally the data can be processed in the demodulation algorithm.

Compared with the magnetic memory, the optical fiber data storage of the present application is based on the data storage mode of the fiber grating array (33), which is small in size, and the fiber grating array (33) which is microprocessed by femtosecond laser can realize high-density storage. Because the optical fiber itself is resistant to electromagnetic interference, this type of memory can be stored and worked stably in a strong magnetic field environment. The fiber grating array (33) can be stored stably for a long time. During this process, there is no need to worry about the influence of temperature, humidity, etc. on the material, and no power supply is required. Therefore, the data can be stably stored in the fiber grating array (33), and the long-term use cost is lower for the types of data that need to be stably stored.

Traditional optical storage devices have strict requirements on external conditions such as light and temperature. In the optical fiber data memory of the present application, although the optical fiber grating device also responds to external conditions, it does not have a large impact on information writing and reading during data storage and demodulation. The fiber grating array (33) based on femtosecond laser micromachining can work stably in a high temperature environment up to 800°C, thus expanding the use scenarios of the data storage of the fiber grating array (33) and reducing the limitation on the working environment.

The optical fiber data memory of the present application can be realized by processing the optical fiber grating with a femtosecond laser when writing data.

Fix the optical fiber on the three-dimensional displacement platform, and adjust the platform so that the femtosecond laser can be accurately focused on the fiber core. A microscope objective lens with high magnification and large numerical aperture is selected as the processing objective lens. Input the obtained preparation parameters, such as the spatial distribution of the grating writing, the length of the grating segment (301) (the length of the physical space occupied by each coding bit), the spacing of the grating segment (301) (the interval between the coding bits), etc., Start the automatic preparation of the fiber grating array (33). Write fiber gratings at different positions in the fiber axis according to the rules obtained in step S1. The fiber gratings at each position are written in dot arrays or line arrays using femtosecond laser micromachining, and the length of each small grating is only on the order of microns.

Using femtosecond laser for writing, the parameters can be adjusted in time, the preparation is flexible, the processing speed is fast, and the efficiency is high. Utilizing the precision of the femtosecond laser micromachining method, the fiber core can be written with certain regular structures, such as line arrays, point arrays, etc., so as to modulate the refractive index of the optical fiber.

The principle of data storage of the fiber Bragg grating array (33) is that there is a certain time delay in the signal light reflected by the fiber Bragg grating at different positions in the same section of fiber, and the time domain reflection signal of the fiber Bragg grating array (33) can be demodulated to obtain The reflected signal corresponds to the spatial position of the fiber.

In the process of processing, taking binary as an example, the known binary code sequence of 1 or 0 can be converted into the presence or absence of grating in space, and the signal can be written into the optical fiber quickly and accurately through femtosecond laser. When demodulating, it is only necessary to extract the time domain reflection signal, and use the written program to post-process it, so as to restore the written information.

On this basis, by changing the modulation intensity of different grating segments, the encoding from binary to multi-ary can be realized. The presence or absence of the spatial distribution of the grating represents 1 or 0. On this basis, various combinations such as quaternary and octal can be realized through the strength of the reflected signal. By defining different reflected signal strength intervals as distinctions, the corresponding demodulation method is used for data recovery according to different strengths during demodulation.

In the optical fiber data memory shown in Figure 1, the fiber grating array (33) means that six fiber grating segments (301) are continuously written in different positions in a section of optical fiber, and there will be six reflections in the time domain at the output end For the signal peak, the information obtained through demodulation means that the section of fiber grating array (33) with coded information is a total of 6 bits of data, all of which are 1.

The present application also provides an optical fiber data storage demodulation system, which includes a computer, a time domain reflection signal detection terminal, and the above-mentioned optical fiber data storage.

Wherein, one end of the optical fiber data memory is connected to a time domain reflection signal detection terminal through an optical fiber jumper, and the time domain reflection signal detection terminal is connected to a computer. The time domain reflection signal detection terminal is used to detect and record the time domain reflection signal of the fiber grating array (33);

The computer is used to process the obtained time domain reflection signal, and extract and obtain the data information written in the fiber grating array (33).

The present application also provides a demodulation method of an optical fiber data storage, and the stored data information can be extracted by the following method:

S3, read the time domain reflection signal of the optical fiber data storage through the time domain reflection signal detection terminal;

S4, using a demodulation program to process the obtained time-domain reflection signal, restore the written data information, and realize data demodulation of the fiber grating array (33).

In the above step S3, one end of the optical fiber data memory is connected to the time domain reflection signal detection terminal through the optical fiber jumper, and the time domain reflection signal detection terminal is connected to the computer; the time domain reflection signal detection terminal detects and records the fiber grating array (33) time domain reflection signal.

In the above step S4, the demodulation program in the computer performs data demodulation processing on the obtained time domain reflection signal, and obtains the data written in the fiber grating array (33).

For the fiber grating array (33) data memory that has written data, the data acquisition is realized by measuring the time domain reflection signal of the fiber grating array (33). Figure 3 is a schematic diagram of the device for the demodulation system, where (1) is a time domain reflection signal detection terminal, (2) is a computer, and (3) is an optical fiber data storage.

Before extraction and demodulation, the time-domain reflection signal detection terminal (1) is first calibrated and matched. During the calibration process, the detection light signal is used to irradiate the reflection surface with a fixed length. Specifically, the time-domain reflection signal is used to detect the terminal (1) Send a probe beam onto a length of jumper wire of known length and known dielectric. The gold-plated end face of the jumper reflects the optical signal, and the optical signal can be detected from the terminal after a known time delay. Utilizing the characteristic that the propagation time of fixed-wavelength light waves in the same medium and the same length remains unchanged, this principle is used to calibrate the time-domain reflection signal detection terminal. The device 1 is calibrated with known time delays as calibration conditions.

When reading data in step S3, one end of the fiber grating array (33) data memory is connected to the time domain reflection signal detection terminal through a fiber jumper, and the time domain reflection signal detection terminal 1 sends a detection light signal to the optical fiber, and the time domain reflection signal The signal detection terminal 1 scans to obtain and record the time domain reflection signal of the fiber grating array (33), and realizes signal recording by collecting the time domain reflection signal of the fiber grating array (33).

Finally, post-processing the obtained time-domain reflection signal through the demodulation program in the computer (2), extracting the storage information corresponding to the fiber grating array (33); as described in step S4.

The computer (2) uses the programmed program to perform low-pass filtering, signal peak extraction, encoding and other operations on the obtained time-domain reflection signal, and finally realizes the data demodulation of the fiber grating array (33), and obtains the data written in the fiber grating data in array(33).

After data demodulation, multi-ary data such as binary data can be obtained. If the original data is non-binary data, in the demodulation algorithm, it is only necessary to select the corresponding base system for corresponding recovery processing.

This application uses the time-domain reflection signal of the fiber grating array (33) as a demodulation method, and does not need to perform complex calculations during data extraction. The reflected time-series signal can be obtained through a sensitive detector, and then demodulated using the already written The data extraction and recovery can be completed after the program is configured and the required parameters are configured.

This application proposes an optical fiber data storage, which is a firm and stable fiber grating array (33) data storage. Compared with the existing magnetic memory and traditional optical memory, the outstanding advantage of this application is that it can use the flexibility and accuracy of femtosecond laser processing, and can flexibly change the preparation parameters through data preprocessing, and then can convert large quantities of The data is automatically written into the optical fiber, and the automatic writing of large batches of data can be realized on the premise of ensuring the accuracy of the information. On the premise of not destroying the original mechanical strength of the optical fiber, the data can be automatically written into the optical fiber in batches, which can realize the big data storage of information in harsh environments such as high temperature and high pressure, which reduces the environmental restrictions of traditional storage methods and reduces the cost of traditional storage. The maintenance cost required by the method. At the same time, because the optical fiber itself is resistant to electromagnetic interference and the written fiber grating array (33) is resistant to high temperature, the data storage device can be applied to working environments such as strong magnetic field and high temperature. The optical fiber data storage of the present application can be used in scenarios such as big data storage and special information encryption that require long-term storage, and can also be used as a means of storing important information in extreme environments.

In the optical fiber data storage of the present application, the optical fiber includes a cladding (31), and a coating layer (not shown in the figure) is also provided outside the cladding (31). Using femtosecond laser for writing, since the data memory of the fiber grating array (33) writes information directly into the fiber core, there is no need to remove the coating layer of the fiber during this process, so the mechanical strength of the fiber itself will not be affected. Therefore, this type of memory has lower requirements on the storage environment, and there is no need to worry about data changing or disappearing due to mechanical wear, so there is almost no maintenance cost. Therefore, the data memory of the fiber grating array (33) can be well protected, so the storage of this type of memory does not require excessive mechanical protection devices.

This application utilizes the optical fiber data storage prepared by femtosecond laser processing. Since it does not have too many requirements on the usage scenarios and environmental conditions, it is suitable for the stable storage of various types of big data. For databases with a lot of data and long-term storage, this type of data storage can use the precise characteristics of femtosecond laser processing to realize batch writing of large-scale data, so it can realize stable and low-cost data storage.

The optical fiber data storage proposed in this application can be used not only for data storage, but also for information encryption. By adding redundant interference information to the information data, and writing all the information into the fiber grating array. During demodulation, the redundant information is removed through a specific algorithm, so as to accurately extract the effective information and realize the encryption of the data. The data represented by grating segments of different intensities or periods can also be specially defined through a specific demodulation algorithm, and only the corresponding algorithm can restore the original data.

Apparently, the embodiments described above are only some of the embodiments of the present application, not all of them. The drawings show preferred embodiments of the present application, but do not limit the scope of patent protection of the present application. The present application can be implemented in many different forms, on the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned specific embodiments, or perform equivalent replacements for some of the technical features. All equivalent structures made using the contents of the description and drawings of this application, directly or indirectly used in other related technical fields, are also within the scope of protection of this application.

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Claims (19)

1. A method for preparing an optical fiber data storage, characterized in that the method comprises the following steps:

   S1, process the data information that needs to be stored, and convert it into data of a unified number system; then convert it into the spatial distribution law of the fiber grating array along the fiber axis according to the preset rules;

   S2, according to the spatial distribution law of the fiber grating array obtained in S1, use the femtosecond laser to write the fiber grating array in the fiber core, and write and save the data of the unified number system in the fiber grating array.
2. The preparation method of optical fiber data storage according to claim 1, characterized in that, in said step S1, the data in the unified number system is multi-ary system data.
3. The preparation method of optical fiber data memory according to claim 2, characterized in that, multi-ary encoding is realized by controlling the modulation intensity of different grating segments.
4. The preparation method of the optical fiber data memory according to claim 2, characterized in that the multi-ary encoding is realized by controlling the grating period of different grating segments.
5. The manufacturing method of optical fiber data memory according to claim 1, wherein the fiber grating array comprises a plurality of grating segments, one grating segment is used to define one bit of data, and the grating segment is composed of several gratings with the same period.
6. The method for manufacturing an optical fiber data storage according to claim 1, wherein the fiber grating array is a line array structure or a point array structure.
7. A demodulation method for an optical fiber data storage, characterized in that the optical fiber data storage is obtained by any one of the preparation methods of claims 1-6; the demodulation method includes: S3, reading the optical fiber through the time domain reflection signal detection terminal time domain reflection signal of the data memory;

   S4, using a demodulation program to process the obtained time-domain reflection signal, restore the written data information, and realize data demodulation of the fiber grating array.
8. The demodulation method of optical fiber data storage according to claim 7, characterized in that, in said step S3, one end of said optical fiber data storage is connected to a time domain reflection signal detection terminal through an optical fiber jumper, and said time domain reflection The signal detection terminal is connected with the computer; the time domain reflection signal of the fiber grating array is detected and recorded through the time domain reflection signal detection terminal.
9. The demodulation method of optical fiber data memory as claimed in claim 8, it is characterized in that, in said step S4, the time domain reflection signal obtained is processed through the demodulation program in the computer, and obtains and writes in the fiber grating array data in .
10. A kind of optical fiber data memory, it is characterized in that, described optical fiber data memory comprises optical fiber, and the information unit stored in optical fiber; Described information unit is fiber grating array, and the data information of information unit is written into and saved in In the fiber grating array.
11. The optical fiber data storage according to claim 10, characterized in that the optical fiber data storage is obtained by any one of the preparation methods of claims 1-6.
12. The optical fiber data storage according to claim 10, wherein the optical fiber includes a core; the data information of the information unit is stored in the optical fiber core in the form of a fiber grating array.
13. The optical fiber data storage according to claim 10, wherein the fiber grating array includes a plurality of grating segments, one grating segment is used to define one bit of data, and the grating segment is composed of several gratings with the same period.
14. 13. Optical fiber data storage device according to claim 13, characterized in that the spacing between the grating segments is fixed.
15. The optical fiber data storage according to claim 13, wherein the one-bit data is multi-ary data.
16. The optical fiber data storage according to claim 15, characterized in that the grating segments used to define the multi-ary data are grating segments with different modulation intensities.
17. The optical fiber data storage according to claim 15, characterized in that the grating segments used to define the multi-ary data are grating segments with different grating periods.
18. The optical fiber data storage according to claim 10, wherein the fiber grating array is a line array structure or a point array structure.
19. The optical fiber data storage according to claim 12, wherein the optical fiber further comprises a cladding layer and a coating layer.