Phase shift diffraction grating measurement device
The phase shift diffraction grating measuring device addresses signal attenuation and complexity issues in optical systems by using a 980 nm pump laser and DFB diffraction grating for accurate signal identification and amplification, ensuring reliable and flexible optical modulation with reduced costs.
Patent Information
- Application Number
- JP2025001747U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2024-06-25
- Filing Date
- 2025-05-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2035-05-30
AI Technical Summary
Conventional optical signal processing systems face challenges such as significant signal attenuation, difficulty in reading weak optical signals, environmental interference, high costs, and inconsistent electrical performance, along with the need for additional filtering and spectroscopic devices that increase complexity and loss.
A phase shift diffraction grating measuring device is employed, comprising an optical fiber with a light source and phase shift diffraction grating at both ends, connected via a frequency division multiplexing device and coupler, with a signal superposition amplification branching circuit, utilizing a 980 nm pump laser and DFB diffraction grating for accurate signal identification and amplification.
The device achieves accurate signal measurement with reduced complexity, high reliability, and lower costs by enabling efficient photoelectric conversion, filtering, and spectroscopy, while ensuring consistent performance and flexibility in optical modulation.
Smart Images
Figure 0003252225000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of optical detection, and particularly to a phase shift grating measuring device.
Background Art
[0002] In some optical systems, light has to pass through complex optical systems, and as a result, the light is greatly attenuated during transmission. To process the information carried by the light, it is necessary to convert the optical signal into an electrical signal, and only after being converted into electricity can subsequent accurate measurements and calculations be performed.
[0003] To reduce losses, in conventional optical signal processing, pre-amplification is performed at the front end, and the pre-amplification includes photoelectric conversion and transimpedance amplification. However, in order to meet the amplification gain, it is often impossible to read weak optical signals, and the signal to be measured is also covered by the surrounding environment, affecting the correct reading and processing of the optical signal. Furthermore, electronic devices are often expensive and it is difficult to maintain the consistency of electrical performance between batches, and the stability of device performance cannot be ensured. Moreover, in order to realize phase modulation, it is necessary to design an FPGA processor participating in the phase modulation. In order to realize the frequency separation and spatial spectroscopy of light waves, it is necessary to add additional filtering and spectroscopic devices, which results in a certain loss of the optical signal and an increase in the complexity of the structure of the measurement system.
Summary of the Invention
Problems to be Solved by the Invention
[0004] The object of the present invention is to overcome the above-mentioned drawbacks of the prior art and provide a phase shift diffraction grating measuring device that can accurately identify the signal to be measured, realize signal amplification sampling, and improve the accuracy of the measurement result.
[0005] The object of the present invention can be achieved by the following technical solutions. A phase shift diffraction grating measuring device includes an optical fiber, a light source and a phase shift diffraction grating are respectively arranged at both ends of the optical fiber, a frequency division multiplexing device and a coupler are arranged between the light source and the phase shift diffraction grating, a unidirectional optical signal is connected to the frequency division multiplexing device, a signal superposition amplification branching circuit is connected to the coupler, and the phase shift diffraction grating measures the movement of an object and outputs a visual signal.
[0006] Furthermore, the light source is connected to a driver for supplying external energy and transmitting a continuous current.
[0007] Furthermore, an optical isolator is connected to the frequency division multiplexing device, a first photodetector is connected to the optical isolator, a measuring body is connected to the first photodetector, and the optical isolator separates the light energy reflected by the optical fiber echo to reduce the insertion loss.
[0008] Furthermore, the signal superposition amplification branching circuit includes an attenuator and a second photodetector connected in sequence, the attenuator is used to superpose and amplify the signal in the circuit, and the second photodetector is used to perform signal amplification sampling.
[0009] Furthermore, the light source is specifically a 980 nm pump laser.
[0010] Furthermore, the driver is specifically a 980 nm pump source driver.
[0011] Furthermore, the frequency division multiplexing device is specifically a 980 / 1550 nm frequency division multiplexing device.
[0012] Furthermore, the optical isolator is specifically a 1550 nm optical fiber isolator.
[0013] Furthermore, the coupler is specifically a 980 nm optical fiber coupler.
[0014] Furthermore, the phase shift diffraction grating is specifically a DFB (Distributed Feedback Laser) diffraction grating.
[0015] Compared with the prior art, the present invention has the following advantages.
[0016] In the present invention, a light source and a phase shift diffraction grating are respectively arranged at both ends of an optical fiber, a frequency division multiplexing device and a coupler are arranged between the light source and the phase shift diffraction grating, a unidirectional optical signal is connected to the frequency division multiplexing device, and a signal superposition amplification and branching circuit is connected to the coupler. Therefore, by using the phase shift diffraction grating, photoelectric conversion amplification, filtering and spectroscopy can be realized, and in combination with the signal superposition amplification and branching circuit, enlarged sampling can be performed on the signal, the measured signal can be correctly distinguished, and the accuracy of the measurement result can be ensured. It has the advantages of simple structure, high reliability and low cost.
[0017] In the present invention, by changing the phase of the light wave using the phase shift diffraction grating, efficient operation of the light wave and more flexible optical modulation are realized. Due to the wavefront modulation characteristics of the diffraction grating, the light wave generates a phase difference at different frequencies, thereby realizing frequency separation and spatial spectroscopy of the light wave, and realizing high-quality light wave spectroscopy. The phase shift diffraction grating also has high fabrication accuracy and reproducibility, and may also be used for storage and processing of optical information. In addition, by encoding and decoding the phase of the light wave, efficient processing and transmission of optical signals can be realized, the temperature compensation range can be reduced, and the complexity and uncertainty of signal processing can be reduced.
Brief Description of the Drawings
[0018]
Figure 1
Description of the Reference Signs
[0019] 1. Optical fiber, 2. Light source, 3. Driver, 4. Frequency division multiplexing device, 5. Coupler, 6. Phase shift diffraction grating, 7. Optical isolator, 8. Attenuator, 9. First photodetector, 10. Second photodetector.
Embodiment for Carrying out the Invention
[0020] Hereinafter, the present invention will be described in detail in conjunction with the accompanying drawings and specific embodiments.
Example
[0021] [[ID=…]] The characteristics of the diffraction grating utilize the photosensitivity of the optical fiber material, that is, the refractive index changes due to the interaction between externally incident photons and ions in the fiber core, and a spatial phase diffraction grating is formed in the fiber core. Its function is essentially to form a narrowband filter or a mirror in the fiber core. There are four main characteristics.
[0022] (1) The performance is stable even at 400 degrees. (2) The optical connection process is transparent, easy to assemble for internal connection, and has low optical loss. (3) It has filtering characteristics. Generally used filters obtain the required wavelength through transmitted light, while the optical fiber diffraction grating obtains the required wavelength through reflected light. (4) It not only utilizes the general transmission and reflection characteristics of optical fibers, but also can realize functions such as frequency shift and amplification.
[0023] The phase shift diffraction grating is a special optical device that realizes the modulation and interference of light waves through the phase difference. It has many advantages and is widely used in many fields. In this solution, these measurement characteristics of the phase shift diffraction grating are utilized to the maximum extent to replace the conventional optical performance signal processing.
[0024] As shown in Fig. 1, there is a phase shift diffraction grating measuring device, which includes an optical fiber 1. A light source 2 and a phase shift diffraction grating 6 are respectively arranged at both ends of the optical fiber 1. A frequency division multiplexing device 4 and a coupler 5 are arranged between the light source 2 and the phase shift diffraction grating 6. A unidirectional optical signal is connected to the frequency division multiplexing device 4, and a signal superposition amplification and branching circuit is connected to the coupler 5. The phase shift diffraction grating 6 measures the movement of the object and outputs a visual signal.
[0025] Specifically, the light source 2 is connected to a driver 3 for supplying external energy and transmitting a continuous current. An optical isolator 7 is connected to the frequency division multiplexing device 4, a first photodetector 9 is connected to the optical isolator 7, and a measured object is connected to the first photodetector 9. The optical isolator 7 separates the optical energy reflected by the optical fiber echo to reduce the insertion loss. The signal superposition amplification and branching circuit includes an attenuator 8 and a second photodetector 10 connected in sequence. The attenuator 8 is used to superpose and amplify the signal in the circuit, and the second photodetector 10 is used to realize the amplified sampling of the signal.
[0026] The phase shift diffraction grating has advantages such as efficient optical performance, high adjustability and controllability, high-quality light wave spectroscopy, and high manufacturing accuracy and reproducibility. Through the device proposed by this solution, functions such as phase shift amplification and filtering are realized, the measured signal can be correctly distinguished to ensure the measurement accuracy, and various costs such as uncertain labor and signal processing can be reduced.
[0027] Using the above device, a phase shift diffraction grating measurement method is realized. The method includes: Step S1: Connect and transmit the unidirectional optical signal of the measured object to the frequency division multiplexing device, and then transmit it to the phase shift diffraction grating and the signal superposition amplification and branching circuit through the coupler. Step S2: The phase shift diffraction grating performs light wave spectroscopy and filtering processing on the optical signal, distinguishes the measured signal, encodes and decodes the phase of the light wave, and outputs a visual measurement result. The signal superposition amplification and branching circuit includes a step of performing superposition and amplification processing on an optical signal.
[0028] In this embodiment, the light source 2 is specifically a 980 nm pump laser, the driver 3 is specifically a 980 nm pump source driver, the wavelength division multiplexing device 4 is specifically a 980 / 1550 nm wavelength division multiplexing device, the optical isolator 7 is specifically a 1550 nm optical fiber isolator, the coupler 5 is specifically a 980 nm optical fiber coupler, and the phase shift diffraction grating 6 is specifically a DFB diffraction grating.
[0029] During actual operation, first, the driver 3 inputs stable external energy to the light source 2 to supply a continuous current. The first photodetector 9 is connected to the optical isolator 7, processes the input optical signal and transmits it in one direction, and then is connected to the wavelength division multiplexing device 4 to transmit the signal. The light source 2, the wavelength division multiplexing device 4, and the coupler 5 are connected in series via the optical fiber 1 and are connected to the phase shift diffraction grating 6 to output various types of visualization signals for data analysis. At the same time, the coupler 5 branches the attenuator 8 in parallel to rationally distribute the power. The attenuator 8 superimposes and amplifies the signals in the circuit and is finally connected to the second photodetector 10 to achieve signal amplification sampling.
[0030] As can be seen from the above, in this solution, stable external energy is provided to the light source through the light source driver to transmit a continuous current. The object to be measured is connected to the optical isolator through the photodetector, allowing only one-way light to pass through, separating the light energy reflected by the optical fiber echo, and reducing the insertion loss. Next, it is connected to the light source as a transmission medium for optical and electrical signals through the wavelength division multiplexing device and the coupler. It is transmitted together with the phase shift diffraction grating and another photodetector. The role of the diffraction grating is to visualize the signal output. As an important sensor, it can measure the movement of the object in real time, feedback complete information, and perform data analysis. The other path is to transmit the signal through the attenuator to the photodetector to amplify the signal and superimpose energy on the weak signal.
[0031] Therefore, compared to conventional measurement methods that originally required rapid photoelectric conversion and amplification, this solution is built using a phase-shifting grating, Previously, functions such as filtering and splitting had to be built externally. This solution uses a phase-shift diffraction grating to achieve this. Phase-shift diffraction gratings can achieve high-quality optical splitting. The wavefront modulation characteristics of the diffraction grating create a phase difference between light waves of different frequencies, enabling frequency separation and spatial splitting of light waves. Previously, additional filtering equipment was required, which resulted in certain losses in the optical signal and made the system large and complex. Now, these functions can be easily achieved internally. Previously, consistent device performance was required. This solution only required ensuring the quality of the phase-shift diffraction grating. Process control was simple, and phase-shift diffraction gratings have high manufacturing accuracy and repeatability. The production of phase-shift diffraction gratings requires high-precision lithography and diffraction grating imaging technology, ensuring the manufacturing quality of the diffraction gratings. Mass production of phase-shift diffraction gratings is also possible, ensuring the repeatability of the diffraction gratings. Processing with electrical signals requires stable device performance, which is costly, and the electrical performance cannot be consistent between batches.
[0032] Phase-shifting diffraction gratings can perform data encoding and compression, making them suitable for long-distance signal transmission, optical information storage and processing. By encoding and decoding the phase of light waves, they can achieve efficient processing and transmission of optical signals. The heat resistance of phase-shift gratings overcomes the problems of heat dissipation and temperature compensation. The heat resistance of optical materials ensures the transmission of optical signals, reduces the range of temperature compensation, and reduces the complexity and uncertainty of signal processing. The phase shift diffraction grating is easy to read and convenient for visual operation. The phase shift diffraction grating can measure weak signals and superimpose energies to make the data more complete. The phase shift diffraction grating can efficiently control light waves by changing the phase of the light waves. In the conventional method, an FPGA (Field Programmable Gate Array) processor is required for phase modulation, and the user needs to understand and master complex mathematical formulas. With this solution, more flexible optical modulation can be realized simply and reliably.
Claims
1. A phase-shifting diffraction grating measuring device, comprising an optical fiber (1), a light source (2) and a phase-shifting diffraction grating (6) are respectively arranged at both ends of the optical fiber (1), and a frequency division multiplexing device (4) and a coupler (5) are provided between the light source (2) and the phase-shifting diffraction grating (6), a unidirectional optical signal is connected to the frequency division multiplexing device (4), a signal superposition amplification and branching circuit is connected to the coupler (5), and the phase-shifting diffraction grating (6) is used to measure the movement of an object and output a visual signal. A phase-shifting diffraction grating measuring device characterized by the above.
2. The phase-shifting diffraction grating measuring device according to claim 1, wherein the light source (2) is connected to a driver (3) for supplying external energy and transmitting a continuous current.
3. An optical isolator (7) is connected to the frequency division multiplexing device (4), a first photodetector (9) is connected to the optical isolator (7), a measured object is connected to the first photodetector (9), and the optical isolator (7) separates the optical energy reflected by the optical fiber echo to reduce the insertion loss. The phase-shifting diffraction grating measuring device according to claim 2, characterized by the above.
4. The signal superposition amplification and branching circuit includes an attenuator (8) and a second photodetector (10) connected in sequence, the attenuator (8) is used to superpose and amplify the signal in the circuit, and the second photodetector (10) is used to perform signal extended sampling. The phase-shifting diffraction grating measuring device according to claim 3, characterized by the above.
5. The phase-shifting diffraction grating measuring device according to claim 4, wherein the light source (2) is specifically a 980 nm pump laser, and the driver (3) is specifically a 980 nm pump source driver.
6. The phase-shifting diffraction grating measuring device according to claim 5, wherein the frequency division multiplexing device (4) is specifically a 980 / 1550 nm frequency division multiplexing device.
7. The phase-shifting diffraction grating measuring device according to claim 6, wherein the optical isolator (7) is specifically a 1550 nm optical fiber isolator.
8. The phase-shifting diffraction grating measuring device according to claim 7, wherein the coupler (5) is specifically a 980 nm optical fiber coupler.
9. The phase shift diffraction grating measuring apparatus according to claim 1, wherein the phase shift diffraction grating (6) is specifically a DFB diffraction grating.