<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>