Universal Photonic Interconnect for Data Centers

Abstract

Tb/s class, copackaged coarse wavelength division multiplexing optical engine based on four wavelength vertical cavity surface emitting lasers (VCSELs) around 1 $\mu$m is presented. The capability to scale bandwidth of 64 Gb/s using equalization and advanced modulation scheme, e.g., four-level pulse amplitude modulation (PAM4) is demonstrated. The capability to scale link distance of 2 km using single-mode VCSELs and standard SMF-28 fiber is demonstrated. Single-mode VCSELs error-free transmission at 25 Gb/s NRZ over 2 km of SMF-28 is achieved. Using forward-error-correction error-free transmission is possible for the PAM4 modulation over 2 km of SMF-28.