Optical write and read apparatus for a topological fiber memory

Abstract

The application discloses an optical writing and reading device for a topological fiber memory. The device comprises a light source module, a data coding module, a phase modulation module, a topological state excitation module, an optical path coupling module, an optical path switching module, an optical signal collection module, a phase demodulation module, a data decoding module, a topological state monitoring module and a control module. In the writing mode, the data is coded into a physical parameter of the optical signal, coupled into the topological structure fiber after phase modulation and topological state excitation, and after writing is completed, the writing success is verified by the topological state monitoring module and the stability criterion; in the reading mode, the optical path is switched to the reading path, and the optical signal is decoded into the original data after collection and phase demodulation. The application realizes the topological state matching writing and efficient reading of the topological fiber, has the outstanding advantages of writing verification, fast reading and writing switching and high reliability, and can be applied to the topological fiber memory and the high-speed optical storage system.

Description

Technical Field

[0001] This invention relates to the fields of optical storage technology and topological photonics, specifically to an optical writing and reading device for a topological fiber optic memory. This invention can be applied to fields such as topological fiber optic memory, optical communication buffers, data center optical storage, and quantum information storage, and is particularly suitable for applications requiring high-reliability optical signal writing and reading in conjunction with fiber optic topologies. Background Technology

[0002] Topological fiber optic memories (GFCMs) are a novel type of storage device that utilizes fiber optic structures made of topological materials to store optical signals. The optical signals are protected by the Chern number within the topological fiber structure, offering advantages such as long storage time and strong anti-interference capabilities. However, the performance of GFCMs depends not only on the topological protection characteristics of the fiber itself but also on the quality of the writing and reading devices. Existing optical writing and reading devices mainly suffer from the following problems: (i) Lack of coupling matching design with topological optical fiber Existing optical write / read devices are mainly designed for ordinary optical fibers, without considering the special optical field distribution and topological state excitation conditions of optical fibers with topological structures, resulting in low write efficiency and poor read signal-to-noise ratio. (ii) Uncontrollable topological state excitation during the writing process Existing devices lack precise control over the topological state excitation conditions when writing data into the topological fiber, resulting in the written optical signal failing to effectively enter the topological protected state and thus reducing storage reliability. (iii) Incomplete topological decoupling during the reading process Existing devices lack effective decoupling methods for topology-protected states when reading optical signals from topological optical fibers. The read signals contain a large amount of non-topological noise, which affects the accuracy of data reconstruction. (iv) Large latency when switching between write and read operations In existing devices, the write optical path and read optical path are designed independently, and switching relies on mechanical optical switches or electronically controlled optical switches. The switching delay is large and it is difficult to meet the requirements of high-speed storage systems. (v) Lack of a write verification mechanism based on topological Chern number Existing devices lack real-time verification of whether the optical signal has successfully entered the topology protection state after the write operation is completed, making it impossible to confirm the reliability of the write operation. To address the above problems, the present invention provides an optical writing and reading device for a topological fiber optic memory. Summary of the Invention

[0003] (a) Purpose of the invention The present invention aims to solve the technical problems in existing optical write and read devices, such as lack of topology fiber coupling matching, uncontrollable topology state excitation, incomplete topology state decoupling, large write-read switching delay, and lack of topology Chern number write verification, and provides an optical write and read device for topology fiber memory. (II) Technical Solution This invention provides an optical writing and reading device for a topological fiber optic memory, characterized in that it comprises: A light source module is used to generate the write optical signal; A data encoding module, connected to the light source module, is used to encode the data to be stored into physical parameters of an optical signal, wherein the physical parameters include at least one of phase, amplitude, polarization state, or wavelength; A phase modulation module, connected to the data encoding module, is used to perform phase modulation on the optical signal so that the phase of the optical signal is consistent with the topological state matching condition of the optical fiber. A topological state excitation module, connected to the phase modulation module, is used to excite the topological protected state in the topological structure optical fiber by adjusting at least one of the angle, polarization, or spatial distribution of the input optical signal. An optical path coupling module is connected to the topological state excitation module and the topological structure optical fiber, and is used to efficiently couple and inject the modulated optical signal into the topological structure optical fiber; An optical path switching module, connected to the optical path coupling module, is used to switch between write mode and read mode; An optical signal acquisition module is connected to the optical path switching module and is used to acquire optical signals from the optical fiber of the topology structure. A phase demodulation module is connected to the optical signal acquisition module and is used to perform phase demodulation on the acquired optical signal to recover the physical parameters of the optical signal; A data decoding module, connected to the phase demodulation module, is used to decode the recovered physical parameters into the original data; A topology state monitoring module is connected to the optical fiber of the topology structure to monitor the topology state parameters of the optical signal in real time after the writing is completed, and to verify whether the writing has successfully entered the topology protection state. A control module is connected to the above modules and is used to coordinate the working timing and parameter configuration of each module. How write mode works: In write mode, the optical path switching module configures the optical path as the write path. The data to be stored is encoded into physical parameters of the optical signal by the data encoding module. The phase modulation module performs phase pre-compensation on the optical signal according to the topological state matching conditions of the optical fiber. The topological state excitation module excites the topological protected states in the optical fiber by controlling the angle, polarization, or spatial distribution of the input optical signal. The optical path coupling module efficiently couples the modulated optical signal into the optical fiber. After writing is completed, the topological state monitoring module monitors the projection angle θ of the optical signal and its rate of change in real time. The success of the write operation is verified based on the topological stability criterion. How the read mode works: In read mode, the optical path switching module configures the optical path as the read path. The optical signal acquisition module acquires optical signals from the optical fiber topology, the phase demodulation module demodulates the acquired optical signals to recover the physical parameters of the optical signals, and the data decoding module decodes the recovered physical parameters into the original data. Core mathematical framework: The topological state excitation module achieves topological state excitation by adjusting the projection angle θ of the input optical signal, wherein the projection angle θ is defined as: Where β_r and β_s satisfy the projection constraint: β_r² + β_s² = 1. The topology state monitoring module verifies whether the write operation was successful based on the following stability criteria: Where γ is the photon loss rate. denoted as the rate of change of the projection angle, C as the topological Chern number, k as the restitution coefficient, and h as Planck's constant. When the criterion is met, the write operation is confirmed to be successful and the optical signal has entered the topology protection state; when the criterion is not met, a rewrite is triggered. The optical path coupling module includes an optical fiber docking mechanism, which includes: A fiber optic clamp used to fix fiber optic topologies. A three-dimensional fine-tuning platform is used to adjust the docking position between the optical path and the optical fiber. A coupling efficiency monitoring unit is used to monitor coupling efficiency in real time. Write and read switching modes: The optical path switching module uses at least one of the following methods to switch between write and read modes: Electro-optic switch: Changes the direction of light path through electro-optic effect, with a switching time ≤10ns. Magneto-optic switch: Changes the direction of light path through magneto-optical effect, with a switching time ≤100ns. Acousto-optic switch: Changes the direction of light path through acousto-optic effects, with a switching time ≤1μs. (III) Beneficial Effects Topology-matched writing: Through phase modulation and topology-excitation modules, precise matching between the optical signal and the topology of the optical fiber is achieved, improving writing efficiency. Write verification mechanism: Through the topology state monitoring module and stability criteria, the write operation is verified in real time to ensure that the write operation has successfully entered the topology protected state, thus ensuring write reliability. High-efficiency optical path coupling: Through fiber optic docking mechanism and coupling efficiency monitoring unit, high-efficiency coupling between the write / read optical path and the topological fiber is achieved. Fast read / write switching: Achieves rapid switching between write and read modes via electro-optic / magneto-optic / acousto-optic switches, with a switching time ≤10ns. Topology-protected state decoupling readout: Effective decoupling of topology-protected states is achieved through a phase demodulation module, improving the readout signal-to-noise ratio. Integrated design: The write optical path and read optical path are integrated into the same device, resulting in a compact structure suitable for high-speed storage systems. Attached Figure Description

[0004] Figure 1 This is a schematic diagram of the overall structure of an optical writing and reading device for a topological fiber optic memory provided in an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the switching between write and read modes provided in an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the topological state excitation and matching principle provided in an embodiment of the present invention. Figure 4 This is a flowchart of write verification and control provided for an embodiment of the present invention. Detailed Implementation

[0005] Example 1: Integrated Reader / Write Device Based on Electro-Optical Switch Step 1: Configure the light source module and data encoding module A 1550nm narrow-linewidth laser with an output power of 10mW was selected as the light source. The data encoding module encodes the data to be stored into a phase sequence of optical signals, with a phase encoding accuracy Δθ ≤ 0.0001rad. Step 2: Phase modulation and topological state matching The phase modulation module performs phase pre-compensation on the optical signal according to the topological state matching conditions of the optical fiber (θ0=5°, σ_θ=0.15°) to match the phase of the input optical signal with the topological state phase of the optical fiber. Step 3: Topological state excitation and optical path coupling The topological state excitation module modulates the angle and polarization of the input optical signal to excite the topologically protected states in the optical fiber. The optical path coupling module efficiently couples the modulated optical signal into the optical fiber through an optical fiber docking mechanism and a three-dimensional fine-tuning platform, achieving a coupling efficiency of ≥90%. Step 4: Write Mode Operation In write mode, the electro-optic switch configures the optical path as the write path. The data encoding module encodes the data into an optical signal, which is then phase-modulated and excited by the topological state before being written into the fiber optic topology. The write pulse width is ≤100ps. Step 5: Write Verification After the write operation is completed, the topology monitoring module monitors the projection angle θ and its rate of change in real time. According to the stability criterion Verify whether the write operation was successful. If the criteria are met, the write operation is confirmed to be successful; if the criteria are not met, a rewrite is triggered. Step 6: Read Mode Operation In readout mode, the electro-optical switch switches the optical path to the readout path within ≤10ns. The optical signal acquisition module acquires optical signals from the optical fiber topology, the phase demodulation module demodulates the acquired optical signals, and the data decoding module decodes the recovered phase sequence into the original data. The readout signal-to-noise ratio is ≥20dB. Example 2: Write Retry Mechanism Based on Topological State Monitoring Step 1: First write attempt Perform the first write operation according to steps 1 to 4 of Example 1. Step 2: Write verification The topology monitoring module monitors the topology parameters after they are written and calculates the stability criteria. Step 3: Write retry When the criteria are not met, the system automatically adjusts the phase modulation parameters (adjustment amount Δθ = 0.001 rad step) and the topological state excitation condition (adjustment of input light angle step 0.1°), and re-executes the write operation until the criteria are met. Step 4: Confirm successful write When the criteria are met, the write operation is confirmed as successful, and the storage operation is completed. The current write parameters are recorded as reference values ​​for subsequent writes. The beneficial effects of this embodiment are: through write verification and automatic retry mechanism, it ensures that data is reliably written to the topology protected state, with a write success rate of ≥99.9%. Example 3: Multi-channel parallel writing and reading Step 1: Configure the multi-channel device The optical writing and reading device is expanded into an 8-channel parallel architecture, with each channel independently configured with a phase modulation module, a topological state excitation module, and an optical path coupling module. Step 2: Parallel Writing Eight channels simultaneously encode data into optical signals and write them into the fiber optic topology, with a total write rate of 800Gbps (8×100Gbps). Step 3: Parallel Reading Eight channels simultaneously read optical signals from the optical fiber topology and decode them into data, with a total read rate of 800Gbps. The beneficial effect of this embodiment is that it achieves high-speed data writing and reading through a multi-channel parallel architecture. Terminology Explanation

[0006] Terminology Meaning Topology matching condition: The phase, angle, and polarization of the input optical signal must satisfy the condition that they are consistent with the topology of the optical fiber. Topological state excitation is the process of inducing an optical signal to enter a topologically protected state by controlling the parameters of the input optical signal. After the write operation is completed, the optical signal is verified to have successfully entered the topology protected state using the topology stability criterion. Topological state decoupling is the process of extracting optical signals from topologically protected states and recovering their physical parameters. Electro-optic switches are optical switching devices that use the electro-optic effect to change the direction of light paths. Fiber optic splicing mechanisms are mechanical structures used for the precise alignment and fixation of fiber optic topologies.

Claims

1. An optical writing and reading device for a topological fiber optic memory, characterized in that, include: A light source module is used to generate the write optical signal; A data encoding module, connected to the light source module, is used to encode the data to be stored into physical parameters of an optical signal; A phase modulation module, connected to the data encoding module, is used to perform phase modulation on the optical signal so that the phase of the optical signal is consistent with the topological state matching condition of the optical fiber. A topological state excitation module, connected to the phase modulation module, is used to excite the topological protected state in the topological structure optical fiber by adjusting at least one of the angle, polarization, or spatial distribution of the input optical signal. An optical path coupling module is connected to the topological state excitation module and the topological structure optical fiber, and is used to couple and inject the modulated optical signal into the topological structure optical fiber; An optical path switching module, connected to the optical path coupling module, is used to switch between write mode and read mode; An optical signal acquisition module is connected to the optical path switching module and is used to acquire optical signals from the optical fiber of the topology structure. A phase demodulation module is connected to the optical signal acquisition module and is used to perform phase demodulation on the acquired optical signal to recover the physical parameters of the optical signal; A data decoding module, connected to the phase demodulation module, is used to decode the recovered physical parameters into the original data; A topology state monitoring module is connected to the optical fiber of the topology structure to monitor the topology state parameters of the optical signal in real time after the writing is completed, and to verify whether the writing has successfully entered the topology protection state. A control module is connected to the above modules and is used to coordinate the working timing and parameter configuration of each module.

2. The apparatus according to claim 1, characterized in that: The physical parameters include at least one of phase, amplitude, polarization state, or wavelength.

3. The apparatus according to claim 1, characterized in that: The topological state excitation module achieves topological state excitation by adjusting the projection angle θ of the input optical signal. The projection angle θ is defined as θ = arctan(β_s / β_r), where β_r and β_s satisfy the projection constraint β_r² + β_s² = 1.

4. The apparatus according to claim 1, characterized in that: The topology state monitoring module verifies whether the write operation was successful based on the following stability criteria: Where γ is the photon loss rate. denoted as the rate of change of the projection angle, C as the topological Chern number, k as the restitution coefficient, and h as Planck's constant.

5. The apparatus according to claim 1, characterized in that: The optical path coupling module includes an optical fiber docking mechanism, which includes an optical fiber clamp, a three-dimensional fine-tuning platform, and a coupling efficiency monitoring unit.

6. The apparatus according to claim 1, characterized in that: The optical path switching module adopts at least one of electro-optical switch, magneto-optical switch or acousto-optical switch, and the switching time is ≤10ns.

7. The apparatus according to claim 1, characterized in that: The device supports multi-channel parallel writing and reading, with each channel independently configured with a phase modulation module, a topological state excitation module, and an optical path coupling module.

8. The apparatus according to claim 1, characterized in that: When the criterion is not met, the topology state monitoring module triggers a rewrite, and the system automatically adjusts the phase modulation parameters and topology state excitation conditions until the criterion is met.

9. An optical writing method for a topological fiber optic memory, characterized in that, Includes the following steps: (1) The physical parameters for encoding the data to be stored into optical signals; (2) Phase modulation of the optical signal is performed based on the topological state matching condition of the optical fiber; (3) By controlling the angle, polarization, or spatial distribution of the input optical signal, the topologically protected state in the optical fiber is excited; (4) The modulated optical signal is coupled and injected into the optical fiber of the topology structure; (5) After writing is completed, monitor the topology parameters of the optical signal in real time, and verify whether the writing has been successful and entered the topology protected state according to the topology stability criterion; (6) When the criterion is not met, the phase modulation parameters and topological state excitation conditions are automatically adjusted, and the write operation is re-executed until the criterion is met.

10. An optical reading method for a topological fiber optic memory, characterized in that, Includes the following steps: (1) Switch the optical path to read mode; (2) Acquire optical signals from the optical fiber with the topological structure; (3) Demodulate the phase of the acquired optical signal to recover the physical parameters of the optical signal; (4) Decode the recovered physical parameters into the original data.

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