Adaptive step size adjustment maximum value locking method and system for optical parameter control

Abstract

The invention discloses an adaptive step length adjustment maximum value locking method and system for optical parameter control, belonging to the field of photoelectric chip design. The self-adaptive step size adjustment method proposed by the present invention increases the step size when detecting that the physical quantity of the photonic device is in a continuous "uphill" or continuous "downhill" state, so as to speed up the locking speed; when it detects that the physical quantity is in the vicinity of the maximum value, it jitters In the state, reduce the step size to increase the locking accuracy, so as to achieve high locking accuracy and high locking speed at the same time, for fast and accurate maximum value locking. Compared with the existing maximum value locking algorithm, the present invention only involves simple addition, subtraction, multiplication and division operations, which can be realized only by simple logic operations, so adaptive step size adjustment can be realized with a small hardware overhead , without the assistance of an analog-to-digital converter, thereby overcoming the problem of large hardware overhead in existing adaptive step size adjustment algorithms, and being suitable for large-scale use.

Description

technical field [0001] The invention belongs to the field of optoelectronic chip design, and more particularly, relates to a method and a system for self-adaptive step length adjustment maximum value locking for optical parameter control. Background technique [0002] On-chip photonic devices have many advantages such as high transmission bandwidth, low transmission loss, and easy large-scale integration, and are widely used in optical communication, optical detection, and optical computing. In order to prevent the optical parameters of photonic devices from changing due to temperature changes, manufacturing process deviations, and input laser changes, a closed-loop feedback control system is usually introduced to detect and control their optical parameters. like figure 1 As shown, the closed-loop feedback control system is mostly composed of photonic device, monitoring unit, control algorithm unit and tuning unit. The working principle is as follows: the monitoring unit d...

AI Technical Summary

Problems solved by technology

Some work proposes to use coarse and fine adjustment switching to break this trade-off, while improving the locking speed and locking accuracy, but most of this method requires manual setting of the coarse and fine adjustment switching threshold, which is not suitable for large-scale use

Secondly, when a large thermal fluctuation occurs, it will cause errors in the coarse and fine adjustment switching mechanism, making it difficult to achieve stable locking

Some work proposes to detect the change of the slope of the physical quantity to dynamically adjust the step size, but this method requires an analog-to-digital conversion module (Analog-to-Digital Converter) and a complex calculation unit to determine the specific size of the slope, which increases hardware overhead.

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