Study on temperature characteristics of vertical cavity surface emitting lasers
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摘要: 为了研究垂直腔面发射激光器（VCSEL）输出的光功率与器件温度的关系，确定用户可正常使用网络的温度范围，采用输出光功率与工作电流关系（P-I）模型进行了理论分析及实验验证，并通过简化模型参量及引入电压与电流关系（U-I）特性曲线来优化模型。采用了Levenberg-Marquardt（LM）算法来实现模型参量的求解，对比20℃下的测量数据与拟合数据的相似度，预测得到不同温度下的P-I特性曲线数据。结果表明，在固定温度下，输出光功率随着驱动电流的增加先增后减；在固定的驱动电流下，输出光功率随着温度增加而减小；要保证用户正常上网，电机房里VCSEL激光器工作的环境温度最多不能高于31℃。
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关键词:
- 激光器 /
- 温度特性 /
- 输出光功率与工作电流关系(P-I) /
- 垂直腔面发射激光器 /
- Levenberg-Marquardt算法
Abstract: In order to study relationship between output power and device temperature of a vertical cavity surface emitting laser (VCSEL)and determine the temperature range at which the user can use the network normally, the relationshipmodel between output power and working current (P-I) was used to do theoretical analysis and experimental verification. Then the model was optimized by simplifying the parameters and introducing voltage-current (U-I) relationship curve. The model parameters were obtained by means of Levenberg-Marquardt (LM) algorithm. The P-I characteristic curve data at different temperatures were predicted by comparing the similarity between measured data and fitting data at 20℃.The results show that, at a fixed temperature, optical output power increasesat first and then decreaseswith the increaseof driving current. At the fixed driving current, optical output power decreaseswith the increaseof temperature. To ensure the normal Internet using, room temperature of VCSEL laserscan notbe higher than 31℃. -
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Figure 1. a—U-I curve of measurement data and fit data at 20℃ b—U-I curve of different temperature
Table 1 The initial value and the solved value of the improved P-I model
parameter model solution value initial value unit η 0.4803 0.5 — Ith, 0 -0.0094 0.3×10-3 A Rth 2.873×103 2.873×103 K/W a1 -1.7363×10-4 -2.545×10-5 A/K a2 1.6608×10-6 2.908×10-7 A/K2 a3 -4.5594×10-9 -2.531×10-10 A/K3 a4 4.4282×10-12 1.022×10-12 A/K4 
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