Thermoelectric Coolers for Laser Diodes
The telecommunications market often uses thermoelectric coolers (TECs) to temperature-stabilize semiconductor laser diodes. Laser diodes, called transmission lasers, transmit digital information over fiber optic cables. In Dense Wavelength Division Multiplexed (DWDM) systems, different wavelengths occupy the same fiber optic cable and must not be allowed to drift on top of each other due to changes in temperature. Thermoelectric coolers can either heat or cool the transmission lasers and hence can stabilize their temperature to prevent wavelength drift. Since transmission lasers work nonstop in the field for a minimum of 20 years, the TEC must match the laser’s lifetime and durability both in design and build.