Method and system for remote preparation of bright squeezed light based on a communication fiber

Abstract

The application discloses a bright compressed light remote preparation method and system based on a communication optical fiber. The bright compressed light remote preparation system based on the communication optical fiber comprises a communication optical fiber, a first beam splitter, a first phase modulator, a phase-sensitive amplification module, a second beam splitter, a first phase-locked loop, a second phase modulator, a balanced detector and a second phase-locked loop. The bright compressed light remote preparation system based on the communication optical fiber realizes remote preparation of bright compressed light based on the communication optical fiber, provides high-quality local oscillator light and user-defined preparation, and makes the prepared bright compressed light more stable and higher in compression degree by adopting two phase-locked loops to fix the relative phase between the local oscillator light and the compressed light and the relative phase between pump light and seed light, and the preparation scheme is simple in equipment and does not need to be optically calibrated during use. The application is widely applied in the field of laser technology.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and in particular to a method and system for remotely preparing bright compressed light based on communication optical fibers. Background Technology

[0002] Squeezed light (SL) is a continuous-variable non-classical light with significant applications in quantum precision measurement, quantum imaging, and quantum communication, such as gravitational wave detection, quantum-enhanced sensing and imaging, and continuous-variable quantum key distribution. Based on the presence of coherent amplitude, squeezed light can be divided into two categories: vacuum-squeezed light (VSL) and bright-squeezed light (BSL). Bright-squeezed light exhibits coherent amplitude compared to vacuum-squeezed light, playing a crucial role in improving the sensitivity of spectral measurements, accurate phase estimation, distributed quantum sensing, and quantum key distribution.

[0003] Currently, the technology for preparing bright compressed light has certain limitations. The equipment is complex, the technical requirements are high, and it is difficult to directly generate stable, practically applicable bright quadrature squeezed light (BQSL), and the compression ratio is not high. Furthermore, compressed light is generally used in a remote mode, meaning it is prepared at the transmitting end and transmitted over long distances to the user end. When prepared compressed light is directly distributed to a remote user through lossy fiber, the following limitations exist: 1. Due to decoherence caused by optical loss, the compression ratio decreases significantly over long transmission distances; even a 30% optical loss can reduce the compression ratio from... 10 dB reduced to 4 dB; 2. It is difficult for remote users to prepare a local oscillator (LO) that is completely coherent with the compressed light to measure the properties of the compressed light for subsequent applications, and the accompanying LO will also have problems such as power loss and crosstalk; 3. The type of compressed light (vacuum compressed light or bright compressed light) is determined only by the transmitting end, which severely limits the application experience of remote users.

[0004] Terminology Explanation: Phase-locked loop (PLL): A phase-locked loop is a technique that uses automatic phase adjustment to synchronize the phases of two signals. PLL technology is a phase-locked loop control system that performs this task through negative feedback. Summary of the Invention

[0005] In view of the technical problems such as poor stability and low compression in current compressed light preparation technology, the purpose of this invention is to provide a method and system for remote preparation of bright compressed light based on communication optical fiber.

[0006] On one hand, embodiments of the present invention include a bright compressed light remote fabrication system based on communication optical fibers, the bright compressed light remote fabrication system based on communication optical fibers comprising: Communication optical fiber; the communication optical fiber is used to transmit laser light; The first beam splitter is used to receive the laser light received by the communication optical fiber and split the light to obtain a first laser and a second laser. Phase modulator; the phase modulator is used to receive the first laser beam and perform phase modulation; The second beam splitter is used to receive the second laser beam and split it to obtain the third and fourth laser beams. First piezoelectric fiber stretcher; the first piezoelectric fiber stretcher is used to stretch the optical fiber, causing a change in the phase of the optical fiber; Erbium-doped fiber amplifier; the erbium-doped fiber amplifier is used to amplify the third laser beam and input it to the phase-sensitive amplification module; A phase-sensitive amplification module; the phase-sensitive amplification module is used to receive the first laser and the third laser after passing through the first piezoelectric fiber stretcher and the erbium-doped amplifier, and mix them to output the first compressed light; The third beam splitter is used to receive the first compressed light and split it to obtain the second compressed light and the reference light. A first phase-locked loop; the first phase-locked loop is used to receive the reference light and negatively feed it back to the first piezoelectric fiber stretcher; The second piezoelectric fiber stretcher is used to stretch the optical fiber, causing a change in the fiber phase. A balanced detector; the balanced detector is used to receive the second compressed light and the fourth laser light after passing through the second piezoelectric fiber stretcher, and to detect and output the results. The second phase-locked loop is used to receive the electrical signal output by the balanced detector and negatively feed it back to the second piezoelectric fiber stretcher.

[0007] Furthermore, the first beam splitter is a polarization-maintaining beam splitter with a splitting ratio of 10:90, the second beam splitter is a polarization-maintaining beam splitter with a splitting ratio of 50:50, and the third beam splitter is a polarization-maintaining beam splitter with a splitting ratio of 1:99.

[0008] Furthermore, the bright compressed light remote fabrication system based on communication optical fiber also includes: A phase modulator; the phase modulator is connected between the first beam splitter and the phase-sensitive amplification module, and the phase modulator is used to modulate the phase of the first laser output from the first beam splitter and then input it to the phase-sensitive amplification module; Erbium-doped fiber amplifier; the erbium-doped fiber amplifier is connected between the first piezoelectric fiber stretcher and the phase-sensitive amplification module.

[0009] Furthermore, the phase-sensitive amplification module includes: The first periodically polarized lithium niobate crystal is used to receive the third laser beam amplified by the first piezoelectric fiber stretcher and the erbium-doped fiber amplifier, and output frequency-doubled light. The second periodically polarized lithium niobate crystal is used to receive the first laser beam that has been phase-modulated by the phase modulator and the frequency-doubled light, perform optical parametric amplification, and output the first compressed light.

[0010] Furthermore, the phase-sensitive amplification module also includes: Temperature control device; the temperature control device is used to provide a constant temperature environment for the first periodically polarized lithium niobate crystal and the second periodically polarized lithium niobate crystal.

[0011] Furthermore, the first phase-locked loop includes: A first mixer; the first mixer is used to perform mixing processing on the first phase error signal of the mixed reference light; A first signal generator; the first signal generator is used to provide a signal source for the first mixer; A first low-pass filter; the first low-pass filter is used to perform low-pass filtering on the first phase error signal after mixing; A first proportional-derivative-integral controller; the first proportional-derivative-integral controller is used to perform proportional-derivative-integral control on the first phase error signal after low-pass filtering to obtain a first control signal; A first piezoelectric ceramic amplifier; the first piezoelectric ceramic amplifier is used to amplify the first control signal and output it to the first piezoelectric fiber stretcher; The second phase-locked loop includes: The second mixer is used to perform mixing processing on the second phase error signal of the electrical signal output by the balanced detector. A second signal generator; the second signal generator is used to provide a signal source for the second mixer; The second low-pass filter is used to perform low-pass filtering on the second phase error signal after mixing. The second proportional-derivative-integral controller is used to perform proportional-derivative-integral control on the second phase error signal after low-pass filtering to obtain the second control signal. The second piezoelectric ceramic amplifier is used to amplify the second control signal and output it to the second piezoelectric fiber stretcher.

[0012] Furthermore, the first control signal is used to control the relative phase of the third laser and the first laser; the second control signal is used to control the relative phase of the fourth laser and the second compressed light.

[0013] On the other hand, embodiments of the present invention include a method for remotely preparing bright compressed light based on communication optical fibers, the method comprising: Laser is transmitted via optical fiber. The first beam splitter receives the laser light received by the communication optical fiber and splits it to obtain a first laser and a second laser. The first laser beam is received and phase-modulated using a phase modulator; The second beam splitter is used to receive the second laser beam and split it to obtain the third and fourth laser beams. The third laser beam is received using a first piezoelectric fiber stretcher, and the fiber is stretched to change its phase. The third laser beam, which has passed through the first piezoelectric fiber stretcher, is received and amplified using an erbium-doped fiber amplifier. The phase-sensitive amplification module receives the first laser beam and the third laser beam that has passed through the first piezoelectric fiber stretcher and the erbium-doped amplifier, amplifies them, and outputs the first compressed light beam. The third beam splitter is used to receive the first compressed light and split it to obtain the second compressed light and the reference light. The reference light is received using a first phase-locked loop and negatively fed back to the first piezoelectric fiber stretcher; The fourth laser beam is received using a second piezoelectric fiber stretcher, which stretches the fiber to change its phase. A balanced detector is used to receive the second compressed light and the fourth laser light that has passed through the second piezoelectric fiber stretcher, and to detect and output the results. The second phase-locked loop receives the electrical signal output by the balanced detector and feeds it back to the second piezoelectric fiber stretcher.

[0014] The beneficial effects of the present invention are as follows: The bright compressed light remote preparation system based on communication optical fiber in the embodiment realizes the remote preparation of bright compressed light based on communication optical fiber, and provides high-quality local oscillator light and user-defined preparation. By using two phase-locked loops to fix the relative phase between the local oscillator light and the compressed light and the relative phase between the pump light and the seed light respectively, the prepared bright compressed light is more stable and has a higher degree of compression. Moreover, the preparation scheme is simple to equip and does not require optical calibration during use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the bright compressed light remote preparation system based on communication optical fiber in the embodiment; Figure 2 This is a schematic diagram of the phase-sensitive amplification module in the embodiment; Figure 3(a) is a schematic diagram of the structure of the first phase-locked loop in the embodiment; Figure 3(b) is a schematic diagram of the structure of the second phase-locked loop in the embodiment; Figure 4 This is a schematic diagram illustrating the application of the bright compressed light remote preparation system based on communication optical fiber when multiple user terminals are set up in the embodiment. Figure 5 This is a schematic diagram illustrating the steps of the method for remotely preparing bright compressed light based on communication optical fiber in the embodiment. Detailed Implementation

[0016] Compared to directly distributing compressed light at the transmitting end, which suffers from problems such as unstable compressed light, low compression degree, limited types, and limited transmission distance, remotely preparing compressed light at the user end can effectively solve the above limitations, enabling longer transmission distances. Furthermore, depending on the specific needs of the user, bright amplitude squeezed light (BASL) for precise measurements and bright phase squeezed light (BPSL) for quantum enhanced phase measurements can be prepared.

[0017] Based on the above background, a bright compressed light remote fabrication system based on communication optical fiber is provided. In this embodiment, the structure of the bright compressed light remote fabrication system based on communication optical fiber is as follows: Figure 1 As shown. (Refer to...) Figure 1 The bright compressed light remote fabrication system based on communication optical fiber includes a laser, communication optical fiber, a first beam splitter, a phase modulator, a first piezoelectric fiber amplifier, an erbium-doped fiber amplifier, a phase-sensitive amplification module, a first phase-locked loop, a second beam splitter, a second piezoelectric fiber stretcher, a second phase-locked loop, a third beam splitter, and a balanced detector.

[0018] In this embodiment, a laser can be used to generate a 1550nm continuous wave with a linewidth of 100 Hz, and the communication optical fiber can be a standard single-mode fiber with a length of 6km or a multi-core fiber with a length of 17km deployed in the field. (Refer to...) Figure 1 The communication optical fiber transmits the laser generated by the laser to the first beam splitter, which splits the laser received by the communication optical fiber in a 10:90 ratio, thereby directly obtaining the first and second lasers. The second laser is input to the second beam splitter, which splits the second laser in a 50:50 ratio, thereby obtaining the third and fourth lasers.

[0019] Reference Figure 1 The first laser beam, serving as the seed beam, can be phase-modulated using a phase modulator, enabling it to carry a 500 kHz sideband signal. This signal is then fed to the phase-sensitive amplification module, allowing the second phase-locked loop to adjust the relative phase between the fourth laser beam (local oscillator) and the second compressed beam during the detection phase (the relative phase can be customized by the user).

[0020] Reference Figure 1 In the case of a bright compressed light remote preparation system based on communication optical fiber equipped with an erbium-doped fiber amplifier, the third laser first passes through the first piezoelectric fiber stretcher, and then is input to the erbium-doped fiber amplifier for amplification and is fed to the phase-sensitive amplification module as pump light.

[0021] In this embodiment, the structure of the phase-sensitive amplification module is as follows: Figure 2 As shown. (Refer to...) Figure 2 The phase-sensitive amplification module includes a first periodically polarized lithium niobate crystal and a second periodically polarized lithium niobate crystal. When a third laser beam, after phase modulation by a first piezoelectric fiber stretcher and amplification by an erbium-doped amplifier, is input to the phase-sensitive amplification module, the first periodically polarized lithium niobate crystal receives the third laser beam (pump light). The first periodically polarized lithium niobate crystal generates a second harmonic response to the third laser beam (pump light), thereby outputting frequency-doubled light (the frequency of the frequency-doubled light is twice the frequency of the third laser beam, i.e., the frequency of the pump light, i.e., the wavelength of the frequency-doubled light is half the wavelength of the third laser beam; for example, if the wavelength of the third laser beam is 1550 nm, then the wavelength of the frequency-doubled light is 775 nm). When the first laser beam is input to the phase-sensitive amplification module, the first laser beam and the frequency-doubled light output by the first periodically polarized lithium niobate crystal enter the second periodically polarized lithium niobate crystal together. The second periodically polarized lithium niobate crystal performs optical parametric amplification on the first laser beam and the frequency-doubled light, outputting the first compressed light.

[0022] In this embodiment, the phase-sensitive amplification module is also equipped with a temperature control device, which provides a constant temperature environment for the first-period polarized lithium niobate crystal and the second-period polarized lithium niobate crystal, thereby keeping the amplification performance parameters of the phase-sensitive amplification module stable.

[0023] In this embodiment, refer to Figure 1 The first compressed light output from the phase-sensitive amplification module is input to the third beam splitter (specifically a 1 / 99 polarization-maintaining beam splitter). The third beam splitter splits the first compressed light into two laser beams. One laser beam has an intensity of 1% of the intensity of the first compressed light and is used as a reference light input to the first phase-locked loop. The other laser beam has an intensity of 99% of the intensity of the first compressed light, which is referred to as the second compressed light in this embodiment. It is input to the balanced detector for detection and output.

[0024] In this embodiment, the structure of the first phase-locked loop is shown in Figure 3(a). Referring to Figure 3(a), the first phase-locked loop includes a first phase error signal, a first mixer, a first signal generator, a first low-pass filter, a first proportional-differential-integral controller, and a first piezoelectric ceramic amplifier. The first phase error signal is mixed with reference light; the first mixer performs mixing processing on the first phase error signal; the first signal generator provides a signal source for the first mixer; the first low-pass filter performs low-pass filtering processing on the first phase error signal after mixing; the first proportional-differential-integral controller performs proportional-differential-integral control on the first phase error signal after low-pass filtering to obtain a first control signal; and the first piezoelectric ceramic amplifier amplifies the first control signal and outputs it to the first piezoelectric fiber stretcher.

[0025] In this embodiment, the relative phase between the third laser (pump light) and the first laser (seed light) can be adjusted according to the first control signal. Specifically, the relative phase between the third laser (pump light) and the first laser (seed light) to be adjusted by the first control signal can take certain fixed values. For example, when the phase between the third laser (pump light) and the first laser (seed light) is 0, bright phase-compressed light can be obtained, or when the relative phase is π, bright amplitude-compressed light can be obtained.

[0026] In this embodiment, the fourth laser is highly coherent with the second compressed light, so the fourth laser can be used as a high-quality local oscillator (LO).

[0027] In this embodiment, the structure of the second phase-locked loop is shown in Figure 3(b). Referring to Figure 3(b), the second phase-locked loop includes a second phase error signal, a second mixer, a second signal generator, a second low-pass filter, a second proportional-differential-integral controller, and a second piezoelectric ceramic amplifier. The second phase error signal is a mixed signal from the balanced detector. The second mixer performs mixing processing on the second phase error signal. The second signal generator provides a signal source for the second mixer. The second low-pass filter performs low-pass filtering processing on the mixed second phase error signal. The second proportional-differential-integral controller performs proportional-differential-integral control on the low-pass filtered second phase error signal to obtain a second control signal. The second piezoelectric ceramic amplifier amplifies the second control signal and outputs it to the second piezoelectric fiber stretcher.

[0028] In this embodiment, the relative phase between the fourth laser (local oscillator) and the second compressed light can be adjusted according to the second control signal. Specifically, the relative phase between the fourth laser (local oscillator) and the second compressed light to be adjusted by the second control signal can take certain fixed values. For example, when the relative phase between the fourth laser (local oscillator) and the second compressed light is 0, the variance of the orthogonal phase component of the optical field can be obtained, or the relative phase is... The variance of the orthogonal amplitude components can be obtained, allowing the bright compressed light remote preparation system based on communication optical fiber in this embodiment to work normally.

[0029] In this embodiment, refer to Figure 1 The compressed light output from the balanced detector can be used in various laser applications. The laser output from the balanced detector can be digitized at a sampling rate of 1 Gs / s using a 10-bit digital storage oscilloscope, or the noise variance of the bright compressed light can be directly observed using a spectrum analyzer.

[0030] The laser signal output by the phase-sensitive amplification module is related to the relative phase between the third laser (pump light) and the first laser (seed light).

[0031] When the phase difference between the third laser (pump light) and the first laser (seed light) is 0, the phase-sensitive amplification module amplifies the parameters to obtain the maximum laser output power. The laser output by the balanced detector is a bright phase-compressed light.

[0032] When the phase difference between the third laser (pump light) and the first laser (seed light) is π, the phase-sensitive amplification module performs parameter inverse amplification to obtain the minimum laser output power. The laser output by the balanced detector is a bright amplitude compressed light.

[0033] In this embodiment, it can be referred to Figure 4Multiple user terminals are set up, and each user terminal uses a bright compressed light remote preparation system based on communication optical fiber to prepare compressed light (i.e., the laser output by the balanced detector in the bright compressed light remote preparation system based on communication optical fiber). Compressed light can be used in applications such as precision measurement, phase estimation, spectrum analyzer, digital storage oscilloscope, quantum sensing or entanglement preparation.

[0034] The bright compressed light remote preparation system based on communication optical fiber in this embodiment realizes the remote preparation of bright compressed light based on communication optical fiber. It adopts phase-locked operation to simplify the preparation scheme and device, eliminates the need for optical calibration during use, extends the transmission distance, increases preparation efficiency, and improves the stability of the obtained bright compressed light. It can provide remote users with high-quality local oscillator light for user-defined preparation and precise measurement of compressed light. Furthermore, the compressed light between different user terminals can maintain coherence, and multiple user terminals can perform some joint processing based on coherent compressed light. This also makes the bright compressed light remote preparation system based on communication optical fiber in this embodiment have broad application prospects in fields such as long-distance continuous variable quantum information processing and quantum enhanced sensing through optical fiber communication networks.

[0035] The bright compressed light remote preparation system based on communication optical fiber in this embodiment has the following characteristics: 1. A method for remotely preparing bright compressed light based on communication optical fiber has been realized. The prepared bright orthogonal amplitude compressed light has a compression degree of -2.52dB, and the bright orthogonal phase compressed light has a compression degree of -2.01dB. High-quality local oscillator light (LO) and user-defined preparation are also provided. 2. Two phase-locked loops are used to fix the relative phase between the local oscillator light and the compressed light, as well as the relative phase between the pump light and the seed light, respectively, so that the prepared bright compressed light is more stable and has a higher degree of compression; 3. The preparation method is simple and requires no optical calibration during use.

[0036] In this embodiment, a bright compressed light remote fabrication method based on communication optical fibers can be executed using a bright compressed light remote fabrication system based on communication optical fibers. (Refer to...) Figure 5 The method for remotely preparing bright compressed light based on communication optical fiber includes the following steps: S1. Transmit laser light via optical fiber communication; S2. Use the first beam splitter to receive the laser light received from the communication fiber and split it in a 10:90 ratio to obtain the first laser light and the second laser light. S3. Use a phase modulator to receive the first laser beam and perform phase modulation; S4. Use the second beam splitter to receive the second laser beam and split it 50:50 to obtain the third and fourth laser beams; S5. Use the first piezoelectric fiber stretcher to receive the third laser beam and stretch the fiber to change its phase; S6. Use an erbium-doped fiber amplifier to receive and amplify the third laser beam that has passed through the first piezoelectric fiber stretcher; S7. The phase-sensitive amplification module receives the first laser beam and the third laser beam after passing through the first piezoelectric fiber stretcher and the erbium-doped amplifier, amplifies them, and outputs the first compressed light beam. S8. Use the third beam splitter to receive the first compressed light and split it to obtain the second compressed light and the reference light; S9. Use the first phase-locked loop to receive the reference light and negatively feed it back to the first piezoelectric fiber stretcher; S10. Use the second piezoelectric fiber stretcher to receive the fourth laser beam and stretch the fiber to change its phase; S11. Use a balanced detector to receive the second compressed light and the fourth laser beam that has passed through the second piezoelectric fiber stretcher, and then detect and output the results. S12. The second phase-locked loop is used to receive the electrical signal output by the balanced detector and negatively feed it back to the second piezoelectric fiber stretcher.

[0037] By performing steps S1-S12, the technical effect of a bright compressed light remote preparation system based on communication optical fiber can be achieved.

[0038] The same technical effect as that of the method and system for remote preparation of bright compressed light based on communication optical fiber in this embodiment can be achieved by writing a computer program to execute the method and system for remote preparation of bright compressed light based on communication optical fiber in this embodiment when the computer program is read and run.

[0039] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this disclosure are only relative to the relative positional relationships of the components of this disclosure in the accompanying drawings. The singular forms "a," "an," and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. Moreover, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this embodiment specification is only for describing particular embodiments and is not intended to limit the invention. The term "and / or" as used in this embodiment includes any combination of one or more of the associated listed items.

[0040] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may also be referred to as a first element. The use of any and all instances or exemplary language (“e.g.,” “such as,” etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and, unless otherwise required, does not impose a limitation on the scope of the invention.

[0041] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0042] Furthermore, the procedures described in this embodiment can be performed in any suitable order unless otherwise indicated by this embodiment or clearly contradicted by the context. The procedures (or variations and / or combinations thereof) described in this embodiment can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. A computer program includes multiple instructions executable by one or more processors.

[0043] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention of this embodiment includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques of the invention, the invention also includes the computer itself.

[0044] A computer program can be applied to input data to perform the functions of this embodiment, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on the display.

[0045] The above are merely preferred embodiments of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, as long as they achieve the technical effects of the present invention by the same means, should be included within the scope of protection of the present invention. Within the scope of protection of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A bright compressed light remote fabrication system based on communication optical fiber, characterized in that, The bright compressed light remote fabrication system based on communication optical fiber includes: Communication optical fiber; the communication optical fiber is used to transmit laser light; The first beam splitter is used to receive the laser light received by the communication optical fiber and split the light to obtain a first laser and a second laser. Phase modulator; the phase modulator is used to receive the first laser beam and perform phase modulation; The second beam splitter is used to receive the second laser beam and split it to obtain the third and fourth laser beams. First piezoelectric fiber stretcher; the first piezoelectric fiber stretcher is used to stretch the optical fiber, causing a change in the phase of the optical fiber; Erbium-doped fiber amplifier; the erbium-doped fiber amplifier is used to amplify the third laser beam and input it to the phase-sensitive amplification module; A phase-sensitive amplification module; the phase-sensitive amplification module is used to receive the first laser and the third laser after passing through the first piezoelectric fiber stretcher and the erbium-doped amplifier, and mix them to output the first compressed light; The third beam splitter is used to receive the first compressed light and split it to obtain the second compressed light and the reference light. A first phase-locked loop; the first phase-locked loop is used to receive the reference light and negatively feed it back to the first piezoelectric fiber stretcher; The second piezoelectric fiber stretcher is used to stretch the optical fiber, causing a change in the fiber phase. A balanced detector; the balanced detector is used to receive the second compressed light and the fourth laser light after passing through the second piezoelectric fiber stretcher, and to detect and output the results. The second phase-locked loop is used to receive the electrical signal output by the balanced detector and negatively feed it back to the second piezoelectric fiber stretcher.

2. The bright compressed light remote preparation system based on communication optical fiber according to claim 1, characterized in that, The first beam splitter is a polarization-maintaining beam splitter with a splitting ratio of 10:90, the second beam splitter is a polarization-maintaining beam splitter with a splitting ratio of 50:50, and the third beam splitter is a polarization-maintaining beam splitter with a splitting ratio of 1:

99.

3. The bright compressed light remote preparation system based on communication optical fiber according to claim 1, characterized in that: The phase modulator is connected between the first beam splitter and the phase-sensitive amplification module. The phase modulator is used to modulate the phase of the first laser output from the first beam splitter and then input it to the phase-sensitive amplification module. The erbium-doped fiber amplifier is connected between the first piezoelectric fiber stretcher and the phase-sensitive amplification module.

4. The bright compressed light remote preparation system based on communication optical fiber according to claim 1, characterized in that, The phase-sensitive amplification module includes: The first periodically polarized lithium niobate crystal is used to receive the third laser beam amplified by the first piezoelectric fiber stretcher and the erbium-doped fiber amplifier, and output frequency-doubled light. The second periodically polarized lithium niobate crystal is used to receive the first laser beam that has been phase-modulated by the phase modulator and the frequency-doubled light, perform optical parametric amplification, and output the first compressed light.

5. The bright compressed light remote preparation system based on communication optical fiber according to claim 4, characterized in that, The phase-sensitive amplification module further includes: Temperature control device; the temperature control device is used to provide a constant temperature environment for the first periodically polarized lithium niobate crystal and the second periodically polarized lithium niobate crystal.

6. The bright compressed light remote preparation system based on communication optical fiber according to claim 1, characterized in that: The first phase-locked loop includes: A first mixer; the first mixer is used to perform mixing processing on a first phase error signal of the mixed reference light; A first signal generator; the first signal generator is used to provide a signal source for the first mixer; A first low-pass filter; the first low-pass filter is used to perform low-pass filtering on the first phase error signal after mixing; A first proportional-derivative-integral controller; the first proportional-derivative-integral controller is used to perform proportional-derivative-integral control on the first phase error signal after low-pass filtering to obtain a first control signal; A first piezoelectric ceramic amplifier; the first piezoelectric ceramic amplifier is used to amplify the first control signal and output it to the first piezoelectric fiber stretcher; The second phase-locked loop includes: The second mixer is used to perform mixing processing on the second phase error signal of the electrical signal output by the balanced detector. A second signal generator; the second signal generator is used to provide a signal source for the second mixer; The second low-pass filter is used to perform low-pass filtering on the second phase error signal after mixing. The second proportional-derivative-integral controller is used to perform proportional-derivative-integral control on the second phase error signal after low-pass filtering to obtain the second control signal. The second piezoelectric ceramic amplifier is used to amplify the second control signal and output it to the second piezoelectric fiber stretcher.

7. The bright compressed light remote preparation system based on communication optical fiber according to claim 6, characterized in that: The first control signal is used to control the relative phase between the third laser and the first laser; The second control signal is used to control the relative phase of the fourth laser and the second compressed light.

8. A method for remotely preparing bright compressed light based on communication optical fiber, characterized in that, The method for remotely preparing bright compressed light based on communication optical fiber includes: Laser is transmitted via optical fiber. The first beam splitter receives the laser light received by the communication optical fiber and splits it to obtain a first laser and a second laser. The first laser beam is received and phase-modulated using a phase modulator; The second beam splitter is used to receive the second laser beam and split it to obtain the third and fourth laser beams. The third laser beam is received using a first piezoelectric fiber stretcher, and the fiber is stretched to change its phase. The third laser beam, which has passed through the first piezoelectric fiber stretcher, is received and amplified using an erbium-doped fiber amplifier. The phase-sensitive amplification module receives the first laser beam and the third laser beam that has passed through the first piezoelectric fiber stretcher and the erbium-doped amplifier, amplifies them, and outputs the first compressed light beam. The third beam splitter is used to receive the first compressed light and split it to obtain the second compressed light and the reference light. The reference light is received using a first phase-locked loop and negatively fed back to the first piezoelectric fiber stretcher; The fourth laser beam is received using a second piezoelectric fiber stretcher, which stretches the fiber to change its phase. A balanced detector is used to receive the second compressed light and the fourth laser light that has passed through the second piezoelectric fiber stretcher, and to detect and output electrical signals. The second phase-locked loop receives the electrical signal output by the balanced detector and feeds it back to the second piezoelectric fiber stretcher.

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