For 5 G wireless prequel network

the 6 and 10 Gbit/s optical modules of the original 4 G base station equipment can not meet the demand. A 25 Gbit/s 1 310 nm Receiver Optical Subassembly（ROSA） device is designed for the emerging 25 Gbit/s optical module

which is packaged with low-cost and small-size coaxial structure. In this paper

we introduce the characteristics of core materials used in the device including the 25 Gbit/s 1 310 nm self-made PIN photodiode and the Transistor Outline（TO）. The packaging form of the device and the production process of the product are also introduced. Then the sample is fabricated. The responsiveness

loss-back

sensitivity and bandwidth of the device are tested. The results show that the performance of the product can fully meet the requirements of commercial grade and can be commercially used on a large scale with qualified yield.