A cost-effective and compact 28-Gb/s ROSA module using a novel TO-CAN package

In this paper, we present the implemented a 28-Gb/s a receiver optical sub-assembly (ROSA) module by employing the proposed TO-CAN package and flexible printed circuit board (FPCB). We have proposed that signal path between the TO-CAN package and the FPCB have straight-line path and the FPCB incorporate signal line with open stub in order to alleviate signal distortion due to impedance mismatch. The 3-dB optical-to-electrical (O-E) bandwidth and receiver sensitivity of the ROSA module were measured as over 17 GHz and below -14 dBm at extinction ratio of 12 dB and bit error rate of 10^-12.