High-density parallel optical interconnection is introduced as a solution to solve transmission bottlenecks in memory
test system. A protocol-free parallel optical module capable of transmitting from DC to 34.1 Gbps (4.267 Gbps × 8 ch)
has been developed. Data transmission throughput density per unit volume of 19 Gbps/cc and random jitter of less than
3ps rms are achieved. And also, we will describe the manufacturing process, the module testing, and self-diagnosis for
optical transmission system. Furthermore, high-density optical connector and high-density optical fiber cable suited for
mechanical requirements of Memory Test System have been developed.