An overview of micromachining for optical communications - Optical Fiber Communication. OFC 97., Conference on

Figure 3(a) shows a temperature dependence ofthe fiber output and monitor current for one of the fabricated 50 samples of the plastic module. The fiber output was 0.2 mW in the full operating temperature range from -40-85°C. The monitor current was >lo0 (*.A at 0.2 mW fiber output and the trackingwidth of < + -20% was obtained in the full temperature range. The rise and fall time ofthe transmitter were <0.5 ns, which makes >622 MHz operation possible. These characteristics corespond to the conventional lower power version coaxial-type transmitter module. The thermal resistance of the plastic module was 1OO"C/W typical measured by wavelength-shifting method. Intermediate testing data shown in Fig. 3(b) indicate that the fiber output changes are <1 dB both for the heat cycling and 85"C/85% RH driving. These data indicate reliable operation of the fabricated plastic nonhermetic modules. In conclusion, we have demonstrated high performance and small size plastic optical modules, which can be regarded as low-cost solutions for the optical transmitter module applying to the access network systems. The transfer molding packaging has advantages for the massive production like DRAMS than for pre-transfer molded housing. These two types of packaging will be selected by the results of reliability testing