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CN-122017539-A - Photoelectric cooperative testing device for co-packaging module

CN122017539ACN 122017539 ACN122017539 ACN 122017539ACN-122017539-A

Abstract

The invention relates to the technical field of photoelectric integration and testing, in particular to a photoelectric cooperative testing device of a co-packaging module, which effectively excites rare faults such as frequency spectrum killing and the like by synchronously exciting and collecting and reproducing dynamic coupling scenes; the method comprises the steps of constructing a cross-domain coupling risk feature matrix through multi-variable system identification, realizing accurate quantification and positioning of resonance modes, forming a 'test-diagnosis-regulation' closed loop through self-adaptive dynamic remodeling and iterative verification based on eigenvectors, actively eliminating risks in the test, and improving the reliability of products.

Inventors

  • XU YANGEN

Assignees

  • 成都芯瑞科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (9)

  1. 1. A co-packaged module optoelectric co-testing device, comprising: The synchronous excitation and acquisition module synchronously applies an electric domain test signal and an optical domain test signal to the co-packaging module and synchronously acquires an electric domain response signal and an optical domain response signal of the co-packaging module; The multi-domain signal analysis module analyzes the electric domain response signals and the optical domain response signals, and separates and extracts closed-loop thermal tuning control signals of each optical communication channel; The coupling system identification module is used for executing multi-variable system identification and eigen mode decomposition on the integrated system formed by the optical communication channels based on the extracted closed-loop thermal tuning control signals so as to extract a cross-domain coupling risk feature matrix; The resonance risk judging module is used for analyzing eigenvalue and eigenvector distribution of the cross-domain coupling risk feature matrix and judging whether resonance coupling risk modes exist between the optical communication channels or not; The control strategy dynamic remodeling module is used for executing self-adaptive dynamic remodeling on a closed-loop thermal tuning control strategy of an optical communication channel with the resonance coupling risk mode according to eigenvectors corresponding to the resonance coupling risk mode when the resonance coupling risk mode is judged to exist; and the iteration convergence verification module is used for repeating the steps of synchronous excitation and acquisition to the step of resonance risk judgment after the closed-loop thermal tuning control strategy is dynamically remodeled until all risk modes in the cross-domain coupling risk feature matrix are restrained.
  2. 2. The device of claim 1, wherein the synchronous excitation and collection module comprises a programmable arbitrary waveform generator and a tunable laser source, the programmable arbitrary waveform generator is configured to generate an electrical domain test signal comprising a high frequency power supply noise spectrum and a high speed data pattern, the tunable laser source is configured to generate an optical domain test signal with a rapidly adjustable wavelength, and the synchronous excitation and collection module further comprises a high speed digital storage oscilloscope and an optical waveform analyzer for synchronously triggering and collecting the electrical domain response signal and the optical domain response signal, respectively.
  3. 3. The device of claim 1, wherein the multi-domain signal analysis module comprises a high-speed data acquisition unit and a digital signal processor, the digital signal processor is configured to perform a combined time-frequency analysis on the acquired electric domain response signal and the optical domain response signal, and separate and demodulate the micro-heater driving current signal or the thermoelectric cooler control voltage signal corresponding to each optical communication channel from the mixed response signal as a closed-loop thermal tuning control signal by a blind source separation algorithm or digital filtering.
  4. 4. The co-packaged module photoelectric cooperative testing device according to claim 1, wherein the coupled system identification module is configured to perform a numerical calculation process of abstracting an integrated system formed by optical communication channels into a multivariate dynamic system model, wherein closed-loop thermal tuning control signals of the channels are regarded as system inputs, and response signals of the channels after photoelectric conversion are regarded as system outputs; The method comprises the steps of adopting a self-adaptive recursive parameter estimation algorithm to update a coupling parameter matrix in a multivariable dynamic system model on line in real time, executing modal perturbation analysis on the updated coupling parameter matrix, solving all right eigenvectors and corresponding complex frequency eigenvalues, and obtaining a cross-domain coupling risk eigenvector by calculating tensor reduction products of the eigenvector matrix, the complex frequency eigenvalue diagonal matrix and a weight matrix determined by physical distance of each channel.
  5. 5. The device for testing co-package modules according to claim 4, wherein the step of solving all right eigenvectors and corresponding complex frequency eigenvalues comprises: converting the coupling parameter matrix into an upper sea-Berger matrix by adopting an iterative numerical method of matrix spectrum decomposition; Carrying out diagonalization solution on the Shanghai-forest-berg matrix by using an implicit QR algorithm with displacement, wherein the displacement is dynamically determined by calculating the characteristic value of the last second-order main sub-matrix of the current iteration matrix; the algorithm is iterated until the modulus values of all non-diagonal elements are smaller than a preset small tolerance threshold, the iteration matrix is converged into a quasi-upper triangular matrix, and second-order blocks or first-order elements on diagonal lines of the quasi-upper triangular matrix give complex frequency characteristic values; And solving a corresponding linear equation set for each obtained complex frequency eigenvalue through a back substitution method to obtain a non-zero solution vector, and forming a corresponding right eigenvector after normalization processing of the solution vector.
  6. 6. The device for photoelectric cooperative testing of co-packaged module according to claim 5, wherein the coupling parameter matrix is converted into a Shanheims-based Berg matrix by an iterative numerical method of matrix spectral decomposition, and specifically comprises the steps of sequentially operating each column of the matrix by a numerical algorithm based on Haos-Hall-transform, wherein for the kth column, k starts from 1, the numerical algorithm constructs a Haos-Hall-transform matrix designed to zero all elements from the kth+2th row to the last row in the current column, while maintaining orthogonality thereof; The Haoshall transformation matrix is multiplied to the current matrix to be transformed in a left-hand and right-hand mode at the same time, and one-time orthogonal similar transformation is completed, wherein all elements from the (k+2) th row to the last row in the current column are eliminated by the orthogonal similar transformation, and all characteristic values of the matrix are kept unchanged; The process is repeated, the first column to the third last column are sequentially processed, and after a series of orthogonal similar transformation, the original coupling parameter matrix is converted into an upper sea-Berger matrix, namely a matrix with zero elements of other lower triangles except the main diagonal and the last diagonal thereof.
  7. 7. The optoelectronic co-testing apparatus of a co-packaged module as set forth in claim 6, wherein the step of constructing the haushall effect transformation matrix comprises: Selecting a subvector formed from the (k+1) th element to the last element in the kth column of the current matrix to be transformed; Calculating the Euclidean norm of the subvector and constructing a reflection vector based on the norm value and the first element of the subvector; by using the reflection vector, a corresponding projection matrix is generated by an outer product operation, and a final Hastelloy transform matrix is calculated.
  8. 8. The optoelectronic co-testing apparatus of a co-packaged module according to claim 1, wherein the specific step of analyzing eigenvalue and eigenvector distributions of the cross-domain coupling risk feature matrix to determine a resonance coupling risk mode comprises: Calculating the real part of the eigenvalue, wherein the real part is larger than a preset positive real part threshold value The oscillation mode corresponding to the eigenvalue of (2) is marked as unstable mode, wherein ; Calculating component amplitude of eigenvectors corresponding to unstable modes, and identifying channel participation threshold value in which the amplitude exceeds preset channel participation threshold value The optical communication channel corresponding to the component of (2) is marked as a high-participation channel; calculating the phase difference between eigenvector components corresponding to any two high-participation channels, if the absolute value of the phase difference is smaller than a preset phase synchronization threshold value And judging that resonance coupling risk modes exist between the high-participation channels, wherein the risk level is quantified by the real part size and participation of the corresponding eigenvalues.
  9. 9. The optoelectronic co-testing apparatus of a co-encapsulation module of claim 8, wherein the control strategy dynamic remodeling module performs the specific steps of: Calculating target adjustment quantity of each high-risk channel thermal tuning control strategy according to the amplitude and phase of each channel component in eigenvector corresponding to resonance coupling risk mode, wherein the adjustment quantity is in direct proportion to the component amplitude of the channel in eigenvector and opposite in phase Whether the absolute value of the phase difference between the main channel and the main channel is smaller than the phase synchronization threshold value Comprehensively determining; Performing a weighted adjustment on an integration time constant of a closed loop thermal tuning control strategy of the high risk channel, the adjustment weight being determined by the real part size of the corresponding eigenvalue; An adaptive notch filter is introduced into a closed-loop thermal tuning control strategy, the center frequency of the adaptive notch filter is calculated according to the imaginary component of the eigenvalue of the generated resonance coupling risk mode, and the inhibition depth of the adaptive notch filter is adaptively adjusted according to the amplitude of the corresponding channel component in the eigenvector.

Description

Photoelectric cooperative testing device for co-packaging module Technical Field The invention relates to the technical field of photoelectric integration and testing, in particular to a photoelectric cooperative testing device of a co-packaging module. Background The co-packaged optical (CPO) technology significantly improves system bandwidth and energy efficiency by integrating a silicon optical engine with a computation/switching chip at high density. However, this integration results in multiple physical fields such as electricity, light, heat, etc. forming a tight closed loop coupling at the microscale, which creates complex dynamic interaction problems that have not been found in conventional pluggable modules. The prior test technology is mainly used for verifying static parameters of devices or performance of a single channel in a steady state, and is difficult to effectively reproduce and evaluate systematic risks of modules in a real dynamic working scene. One typical deep challenge stems from the parallel multi-wavelength channel structure within the CPO. Each channel typically employs a separate closed loop thermal tuning mechanism (e.g., a micro-heater) to maintain wavelength stability. Under dynamic operating conditions, unexpected coupling between these parallel control loops may occur through a shared substrate or thermal field. For example, when a thermally tuned control loop of one channel experiences small oscillations of a particular frequency (e.g., limit cycle oscillations of a PID loop), and that frequency component happens to fall within the effective bandwidth of a photodetector of an adjacent channel, a rare "coherent crosstalk" is induced. This crosstalk is not broadband noise, but rather represents a frequency selective resonant disturbance that converts the control jitter of one channel into amplitude/phase modulated noise for an adjacent channel. This effect is greatly amplified near a particular temperature or operating point, resulting in a "cliff" degradation of the bit error rate of the affected channel, which can be visually referred to as "spectral splatter". Because of its frequency locking and conditional triggering characteristics, it is extremely difficult to find and locate in conventional steady-state or single-factor sweep tests, constituting a potentially high risk failure mode for CPO modules. Therefore, the prior art system lacks a special test method and device capable of actively exciting, synchronously observing and accurately diagnosing the multi-domain dynamic coupling effect, particularly the frequency selective resonance interference under the condition of approaching to the real running dynamic. This has become a key technical bottleneck that prevents CPO products from performing adequate reliability verification and performance margin assessment. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a photoelectric cooperative testing device of a co-packaged module. In order to achieve the above purpose, the present invention provides the following technical solutions: a co-packaged module optoelectric co-testing apparatus comprising: The synchronous excitation and acquisition module synchronously applies an electric domain test signal and an optical domain test signal to the co-packaging module and synchronously acquires an electric domain response signal and an optical domain response signal of the co-packaging module; The multi-domain signal analysis module analyzes the electric domain response signals and the optical domain response signals, and separates and extracts closed-loop thermal tuning control signals of each optical communication channel; The coupling system identification module is used for executing multi-variable system identification and eigen mode decomposition on the integrated system formed by the optical communication channels based on the extracted closed-loop thermal tuning control signals so as to extract a cross-domain coupling risk feature matrix; The resonance risk judging module is used for analyzing eigenvalue and eigenvector distribution of the cross-domain coupling risk feature matrix and judging whether resonance coupling risk modes exist between the optical communication channels or not; The control strategy dynamic remodeling module is used for executing self-adaptive dynamic remodeling on a closed-loop thermal tuning control strategy of an optical communication channel with the resonance coupling risk mode according to eigenvectors corresponding to the resonance coupling risk mode when the resonance coupling risk mode is judged to exist; and the iteration convergence verification module is used for repeating the steps of synchronous excitation and acquisition to the step of resonance risk judgment after the closed-loop thermal tuning control strategy is dynamically remodeled until all risk modes in the cross-domain coupling risk feature matrix are restrained. Further, t