CN-122026832-A - Phase-sensitive amplifier performance optimization method based on double homodyne measurement and dynamic gain

CN122026832ACN 122026832 ACN122026832 ACN 122026832ACN-122026832-A

Abstract

The application relates to the technical field of optical processing and discloses a phase-sensitive amplifier performance optimization method based on double homodyne measurement and dynamic gain. And carrying out double homodyne measurement on the reflected light beam to obtain an in-phase measurement result and a quadrature measurement result, and generating a retention criterion and a driving criterion according to the association relation between the in-phase measurement result and the quadrature measurement result. And when the sample is a normal sample, generating feedforward driving quantity according to a measurement result corresponding to the normal sample and the current dynamic gain parameter, and carrying out phase-sensitive amplification processing on the transmitted light beam. In the case of split samples, the transmitted beam is subjected to either a clipping process or a gain-down process in accordance with a limited feed-forward rule. And when the sample is refused, prohibiting the refused sample from participating in feedforward. And performing state monitoring to obtain output deviation, and updating the dynamic gain parameters and the driving conditions according to the output deviation. The application improves the control precision, continuous stability and signal transmission consistency of the phase-sensitive amplifying process.

Inventors

GUO HUI
LIU QING
ZHAO CHENYANG
ZHENG DOUDOU

Assignees

太原工业学院

Dates

Publication Date: 20260512
Application Date: 20260409

Claims (10)

1. A phase sensitive amplifier performance optimization method based on dual homodyne measurement and dynamic gain, comprising: Splitting an input light beam to obtain a transmitted light beam and a reflected light beam; Performing double homodyne measurement on the reflected light beam to obtain an in-phase measurement result and a quadrature measurement result, and generating a retention criterion and a driving criterion according to the incidence relation between the in-phase measurement result and the quadrature measurement result; When the retention criterion meets the retention condition and the driving criterion meets the driving condition, determining a current sample as a normal sample, generating a feedforward driving quantity according to a measurement result corresponding to the normal sample and a current dynamic gain parameter, and performing phase-sensitive amplification processing on the transmitted light beam; when the retention criterion meets the retention condition and the driving criterion does not meet the driving condition, determining the current sample as a split sample, and carrying out amplitude limiting treatment or gain reduction treatment on the transmitted light beam according to a limited feedforward rule; and carrying out state monitoring on the processed output light beam to obtain output deviation, and updating the dynamic gain parameter and the driving condition corresponding to the next sample according to the output deviation.
2. The method for optimizing the performance of a phase sensitive amplifier based on double homodyne measurement and dynamic gain according to claim 1, wherein the correlation relationship is the variation direction, relative amplitude and continuous sampling consistency of the in-phase measurement result and the quadrature measurement result.
3. The method for optimizing the performance of a phase sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 2, wherein generating the retention criterion and the driving criterion comprises: and generating the retention criterion according to the relative amplitude and the consistency of continuous sampling, and generating the driving criterion according to the change direction and the adaptation result of the relative amplitude relative to the current dynamic gain parameter.
4. The method according to claim 1, wherein when the feedforward driving amount is generated, the measurement result corresponding to the normal sample is converted into a phase driving amount and a gain driving amount, and the phase-sensitive amplification processing is performed on the transmitted beam in the order of performing the phase correction first and then performing the gain amplification.
5. The method for optimizing performance of a phase sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 4, wherein when the current dynamic gain parameter is in an enhanced gain state, the gain driving amount is increased according to an incremental release rule only when normal samples continuously meet the driving condition, otherwise, the current dynamic gain parameter is maintained or switched to a normal gain state.
6. The method for optimizing performance of a phase-sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 1, wherein the split samples are current samples in a gain switching section, the gain switching section is a processing section in which a current dynamic gain parameter is in an enhanced gain state, and a gain driving amount corresponding to the current samples is greater than a reference driving amount corresponding to the current dynamic gain parameter.
7. The method for optimizing the performance of a phase sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 6, comprising, when in accordance with a constrained feed forward rule: performing amplitude limiting processing or gain reducing processing according to the deviation degree between the driving criterion corresponding to the split sample and the driving condition; and when the deviation degree is in a preset gain reduction interval, the current dynamic gain parameter is reduced, and the gain reduction processing is carried out on the transmitted light beam according to the reduced dynamic gain parameter.
8. The method for optimizing performance of a phase-sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 1, wherein when the current sample is determined to be a reject sample, the feedforward drive amount is set to zero and the current dynamic gain parameter is kept unchanged, and when the reject sample continuously reaches a preset number, the dynamic gain parameter corresponding to the next sample is switched to a normal gain state.
9. The method for optimizing performance of a phase sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 1, wherein updating the dynamic gain parameter and driving condition corresponding to the next sample according to the output deviation comprises: The method comprises the steps of selecting an updating mode according to the deviation direction and the continuous deviation state of output deviation, updating a dynamic gain parameter corresponding to a next sample when the output deviation corresponds to gain deviation, updating a driving condition corresponding to the next sample when the output deviation corresponds to driving deviation, and simultaneously reducing the upper limit of the dynamic gain parameter corresponding to the next sample and tightening the driving condition when the output deviation continuously exceeds a preset deviation range.
10. The method for optimizing performance of a phase-sensitive amplifier based on dual homodyne measurement and dynamic gain according to claim 9, wherein when the output deviation continuously exceeds a preset deviation range and the current dynamic gain parameter is in an enhanced gain state, the dynamic gain parameter corresponding to the next sample is switched to a normal gain state, the dynamic gain parameter corresponding to the next sample is forbidden to enter the enhanced gain state, and when the output deviation corresponding to the continuous preset number of samples is within the preset deviation range, the forbidden is released.

Description

Phase-sensitive amplifier performance optimization method based on double homodyne measurement and dynamic gain Technical Field The invention relates to the technical field of optical processing, in particular to a phase-sensitive amplifier performance optimization method based on double homodyne measurement and dynamic gain. Background The development of continuous variable quantum optics and coherent light information processing technology makes the phase sensitive amplifier have more and more important application value in weak signal detection, quantum communication and precise measurement. The phase-sensitive amplifier can selectively amplify specific phase components, has obvious advantages in the aspects of inhibiting partial noise influence, improving the readability of effective signals and improving the long-distance transmission performance, and is widely used for continuous variable quantum key distribution, weak signal recovery, high-sensitivity measurement and other scenes. Especially in the actual system where transmission loss, environmental disturbance and noise at the receiving end are unavoidable, how to give consideration to output stability and control accuracy while ensuring amplification effect has become a key problem of continuous attention in the technical field. In the prior art, as disclosed in patent CN111541536a, a continuous variable quantum key distribution scheme enhanced by a phase sensitive amplification technology is disclosed, the in-phase amplification and out-of-phase attenuation are performed on a transmitted optical signal by a phase sensitive amplifier, and the receiving end demodulates and recovers the amplified optical signal. However, the focus of the technology is mainly on the enhancement of the amplifying link and the receiving recovery capability, and the layering processing mechanism is lacked for the problems of fluctuation of the reliability of the measurement result, inconsistent control strength and sample state, difficulty in timely adjustment of the amplifying state when the abnormal sample continuously appears, and the like in the continuous processing process. In an actual system, when the input state, the link loss or the noise level changes dynamically, if a relatively uniform amplifying and controlling mode is still adopted, the problems of accumulated output deviation, increased fluctuation of the amplifying state and reduced consistency of processing of adjacent samples are easy to occur, so that the overall stability and continuous operation effect of the system are affected. Therefore, it is necessary to design a phase sensitive amplifier performance optimization method based on dual homodyne measurement and dynamic gain to solve the problems existing in the prior art. Disclosure of Invention In view of the above, the invention provides a phase-sensitive amplifier performance optimization method based on double homodyne measurement and dynamic gain, which aims to solve the problems of accumulated output deviation, fluctuation of amplification state and reduced continuous operation stability of the phase-sensitive amplifier caused by fluctuation of measurement result reliability, mismatching of control intensity and sample state and continuous occurrence of abnormal samples in the continuous processing process. The invention provides a phase-sensitive amplifier performance optimization method based on double homodyne measurement and dynamic gain, which comprises the following steps: Splitting an input light beam to obtain a transmitted light beam and a reflected light beam; Performing double homodyne measurement on the reflected light beam to obtain an in-phase measurement result and a quadrature measurement result, and generating a retention criterion and a driving criterion according to the incidence relation between the in-phase measurement result and the quadrature measurement result; When the retention criterion meets the retention condition and the driving criterion meets the driving condition, determining a current sample as a normal sample, generating a feedforward driving quantity according to a measurement result corresponding to the normal sample and a current dynamic gain parameter, and performing phase-sensitive amplification processing on the transmitted light beam; when the retention criterion meets the retention condition and the driving criterion does not meet the driving condition, determining the current sample as a split sample, and carrying out amplitude limiting treatment or gain reduction treatment on the transmitted light beam according to a limited feedforward rule; and carrying out state monitoring on the processed output light beam to obtain output deviation, and updating the dynamic gain parameter and the driving condition corresponding to the next sample according to the output deviation. Further, the association relationship is the change direction, the relative amplitude and the continuous sampling consistency of