DWDM optical transport systems are an important link in communications networks. These systems are the backbone of telecommunications infrastructures and carry large volumes of telecom traffic. As a result, their reliability is critical. Thermal performance is key to meeting this reliability requirement and is therefore a major component of DWDM system development. The resulting thermal design process must balance opposing requirements such as high product density, thermal sensitivity of optical components, cooling fan noise limits, and high ambient temperature and altitude requirements. This paper describes both a thermal design approach for DWDM system development, and a thermal design solution that demonstrates high product density and field-proven reliability.

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