High-power fundamental-mode and polarisation stabilised VCSELs using sub-wavelength surface grating

Abstract

A monolithic technique is presented for simultaneous mode and polarisation control in oxide-confined VCSELs using a locally etched sub-wavelength surface grating. A single-fundamental-mode emission with an SMSR >30 dB and an OPSR ∼20 dB is achieved over the entire operational current range, with a maximum output power of 4.1 mW.