SWIR avalanche photodetectors (APD) siv qhov hluav taws xob rov qab los ua kom muaj qhov nce ntxiv. Qhov no tso cai rau lawv kom muaj SNR siab (lub teeb liab-rau- suab nrov piv) piv rau PIN diodes. Nws tseem muaj lub sijhawm teb sai dua, kev nkag siab zoo dua, nrog rau qis dua tam sim no thiab cov duab suab nrov. Cov lus teb spectral ntawm APDs kuj yog qhov haum rau SWIR ntau yam.
Dab tsi ntxiv, InGaAs system zoo li zoo tagnrho rau SWIR detectors. Namely, nws muab tus qauv txiav tawm ntawm 1,700 nm. Qhov no suav nrog feem ntau cov kab hluav taws xob laser emissions ntawm tus qauv wavelengths. SWIR APDs siv avalanche nce los tsim cov teeb liab amplification. Ib qho ntawm qhov zoo tshaj plaws ntawm qhov no yog tias lawv tso cai siv lub qhov muag tsis pom kev zoo. Tsis tas li ntawd, qhov no kuj ua rau lub sensor uas tsis xav kom txias.
