10/25/2024, 08:37 AM UTC
ECOC2024：华为应用于Lidar的APDECOC2024: Huawei's Application of APD in Lidar
<p>➀ 商用APD通常由InGaAs/InAlAs和InGaAs/InP组成，但由于冲击电离比系数(k)较大，噪声因子较大，严重降低了灵敏度，探测200米以上距离需要高功率激光器。</p><p>➁ 华为在InP上生长出1.5μm InGaAs吸收层和0.55μm Al0.85Ga0.15As0.56Sb0.44层组成的APD结构，形成200 μm半径光敏区和增透涂层的正入射APD。</p><p>➂ 与InP APD相比，AlGaAsSb APD的增益为127，噪声因子低至4.0。</p><p>➃ 在低于20℃的温度下，AlGaAsSb APD具有超过5db的灵敏度优势，在105℃下仍有2db的优势。</p><p>➄ 在相同条件下，AlGaAsSb APD在激光雷达系统中的信号是InP APD的四倍，这意味着所需的激光功率降低了66%。</p><p>➅ 经过2000小时的老化测试，AlGaAsSb APD的击穿电压下降小于1V，暗电流增加小于30%，通过了整个可靠性测试。</p><p>➀ Commercial APDs typically consist of InGaAs/InAlAs and InGaAs/InP, but they have high noise factors and require high-power lasers for long-range detection.</p><p>➁ Huawei has developed an APD structure with a 1.5μm InGaAs absorption layer and a 0.55μm Al0.85Ga0.15As0.56Sb0.44 layer on InP, achieving a 200 μm radius photosensitive area with an anti-reflection coating.</p><p>➂ AlGaAsSb APD demonstrates higher gain (127) and lower noise factor (4.0) compared to InP APD.</p><p>➃ AlGaAsSb APD has a sensitivity advantage of over 5dB at temperatures below 20°C and maintains a 2dB advantage at 105°C.</p><p>➄ In a laser radar system, AlGaAsSb APD provides four times the signal of InP APD, reducing the required laser power by 66%.</p><p>➅ AlGaAsSb APD passed reliability tests with a breakdown voltage decrease less than 1V and dark current increase less than 30% after 2000 hours of aging.</p>
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