"This is because of their inherently higher and more stable temperature performance compared with 850nm VCSELs. VCSELs that emit at wavelengths of 1200nm or longer are especially attractive for integration within silicon photonics because silicon waveguides have low losses at these longer wavelengths.".......they are not talking about the size of the chip set Krom......"We have used all these findings to design new gallium arsenide (GaAs)-based VCSEL structures that operate at a wavelength of 980nm." .....derekwpg