Approximate three-dimensional setting method of proportion integration differentiation (PID) temperature control parameters of laser device based on narrow field theory

Abstract

The invention discloses an approximate three-dimensional setting method of proportion integration differentiation (PID) temperature control parameters of a laser device based on a narrow field theory. The method is presented when PID temperature control is carried out to the temperature of a laser diode, considering control precision and system expense. The method optimizes the tracking error terms of performance indicator function, introduces the differential term of the tracking error to the indicator function, presents an approximation algorithm based on a first dimension E and a second dimension EC variable to set up an approximate third dimension linguistic variable ECC, through the introduction of the third dimension ECC, and sets up a fuzzy rule to control, wherein the E stands for the deviation of a measure value and a set value, the EC stands for the deviation of the E, and the ECC stands for the deviation of the EC. The method measures fitting data and carries out fuzzy reasoning, carries out fuzzy judgment by optimizing the fuzzy rule, and carries out fuzzy control.

Description

technical field [0001] The invention relates to an approximate three-dimensional tuning algorithm for laser temperature control parameters based on narrow domain theory, in particular to an approximate three-dimensional tuning method for PID parameters in a laser temperature control system. Background technique [0002] With the rapid development of the broadband industry, laser communication has encountered some technical difficulties while reflecting its unique advantages. As the relay distance becomes longer and the communication rate is higher and higher, the temperature has become its performance bottleneck. one. Changes in laser temperature will lead to changes in threshold current, output power, and output wavelength, which will lead to shortened laser life and low electro-optical conversion efficiency, resulting in unstable performance of the laser. [0003] Diode lasers (LDs) are poorly tolerant to current surges and operating temperature changes. Due to the exist...

AI Technical Summary

Problems solved by technology

The traditional two-dimensional fuzzy control is to calculate the coordinate value in the plane, the calculation amount is small, but the temperature control accuracy is 0.25 ℃, and the control accuracy is low; the traditional three-dimensional fuzzy control is to calculate the coordinate value in the three-dimensional space, and the temperature control accuracy is 0.08 ℃, high precision, but high computational complexity

[0006] At present, the semiconductor laser temperature control system produced in China has the advantages of temperature control accuracy (0.02°C), resolution (0.001°C), stability (long-term stability [3] There are many deficiencies in other aspects, and the control algorithm needs to be optimized; the semiconductor laser (LD) temperature controller produced abroad not only has high precision (0.001°C), good stability (long-term stability <0.005°C), and the degree of intelligence Higher, but the technology is strictly confidential and the price is high

Traditional two-dimensional fuzzy control has low control precision and cannot meet the high-precision requirements of next-generation optical communication

Three-dimensional fuzzy control has the disadvantage of high system overhead, which makes it difficult to be widely used in laser communication

In addition, the three-dimensional fuzzy control operation is complex and the reasoning time is long, so unless the dynamic requirements are relatively high, this type of fuzzy controller is generally seldom used.

However, pure digital PID has high data requirements and is difficult to apply in complex systems.

Images