8 x 50-Gb/s simultaneous operation of EADFB laser array using flip-chip interconnection technique

We fabricated an eight-channel EADFB laser array sub-assembly using a flip-chip interconnection technique that provided a low crosstalk. We achieved clear eye openings for all eight lanes with 8 × 50-Gb/s simultaneous operation.

1. Introduction

The recent rapid growth of data communication services such as cloud computing has triggered the need for large data capacity for inter-data-center optical networks. To cope with this requirement, a 400-Gb/s Ethernet (400GbE) [1] system is expected to be developed as a next-generation inter-data-center optical network. If a conventional nonreturn-to-zero on-off keying (NRZ-OOK) system is used, a range, -Gb/s scheme is a promising candidate for a 400GbE optical network system. As compact 50-Gb/s light sources, directly modulated lasers (DMLs) [2]–[3] and electroabsorption modulators integrated with distributed-feedback lasers (EADFB lasers) [4]–[6] have been reported.