50 Gb/s Zn-Diffusion Few-Mode VCSELs for over 100-m GI-SMF Transmission at 850 nm Wavelength

Thisstudy demonstrates a Zn-diffusion few-mode (FM) vertical-cavity surface-emitting laser (VCSEL) with a performance of the quasi-single-mode, SMSR over 20 dB. The VCSELs have a stable output power due to the larger oxide aperture because high-order transverse modes are suppressed through impurity-induced disordering of Zn-diffusion. The VCSEL has a 6 μm oxide confined aperture diameter, and an Zn-diffusion aperture diameter of 4 μm, depth of 1 μm. It can reach a resonance frequency as high as 26.5 GHz at 9 mA and a modulation bandwidth exceeding 20 GHz. Error-free transmission at bit rates exceeding 50 Gbit/s with the encoded NRZ-OOK over 100 m of graded-index single-mode fiber (GI-SMF) is demonstrated. ? 2002-2012 IEEE.