A temperature-controlled optoelectronic module that includes a module housing, a laser mount structure for affixing a laser package in the module housing, an optical fiber receptacle structure disposed adjacent to the laser mount structure, a thermal isolator affixed between the laser mount structure and the optical fiber receptacle structure, and a temperature controller coupled to the laser mount structure and operable to regulate temperature of the laser package is disclosed. In the absence of the thermal isolator, a nullthermal shortnull may be created between the module housing and the laser package, substantially reducing the efficiency of the temperature controller. The presence of the thermal isolator eliminates the nullthermal short,null substantially increases the effectiveness of the temperature controller and enables the miniaturization of temperature-controlled optoelectronic transceiver modules.