为改善温度波动对光通信用半导体激光器性能的影响, 设计了基于三维语言变量的高精度跟踪误差温度控制系统。为减小系统成本, 利用运算放大器AD620和OP07等器件设计了温度采集系统, 并采用最小二乘法拟合温度数据, 从而建立温度—电阻关系模型, 预测温度变化趋势; 加入第三维模糊语言变量, 结合窄域论以适当压缩E、EC、ECC的论域, 采用模糊规则设定方法, 建立新型三维模糊PID规则表并求解得出模糊查询表。结果表明: 当预设温度为25 ℃时, 温控系统超调量为0.97 ℃, 最大下冲量出现在第17 s, 其值为0.69 ℃; 工作51 s后, LD系统进入稳定状态, 温度保持为25±0.05 ℃; 在第150~210 s内, 其温度值标准差为0.020 4 ℃。同时, 该系统实现了对半导体激光器0~75 ℃的大范围精密温控, 温控精度为±0.05 ℃。该系统能够实现对半导体的高效制冷、加热控制, 具有响应时间快和系统开销小的优势, 能对控制参数实现自整定。

To improve the impact of temperature fluctuation on performance of diode laser used for optical communication, a high-precision temperature control system by tracking error based on 3D linguistic variable was designed. To lower the system cost, at the same time, a temperature acquisition system was also designed under the help of operational amplifier AD620 and OP07, and least square method was used to fit the temperature data, thus establishing a temperature-resistance relationship model to predict the temperature variation trend; then a third-dimension fuzzy linguistic variable was added, and after properly compressing the domain of E, EC and ECC in accordance with the narrow field theory, a new-type fuzzy-PID rule table was created by adopting the method for fuzzy rule setting, thus working out the fuzzy query table. The results indicate that when the specified temperature is 25 ℃, overshoot of the temperature control system will be 0.97 ℃, with a maximum impulse of 0.69 ℃ occurring at 17 s; after 51 s, LD system enters into a stable state, with a temperature maintained at 25±0.05 ℃; during the time period of 150~210 s, standard deviation of temperature value is kept at 0.020 4 ℃. The system, at the same time, achieves high precision temperature control over the diode laser within a large range of 0~75 ℃, with a temperature control precision of ±0.05 ℃. In addition, the system can achieve high-efficiency cooling and heating control over the diode laser, with such advantages as short response time, low cost and self-tuning parameters.