Thermoelectric Coolers for Avalanche Photodiodes
The telecommunications market often uses thermoelectric coolers (TECs) to temperature stabilize Avalanche Photodiodes (APD). APDs are always reverse biased at a high voltage and therefore subject to excessive noise created by thermal energy. TECs can cool the APD and significantly reduce thermal noise, thereby increasing the APDs signal-to-noise ratio and its ability to differentiate very weak incoming light pulses. As with all Telcordia components, APDs are expected to work nonstop in the field for a minimum of 20 years; the TEC must accommodate the laser’s lifetime and durability both in design and build.