PROTON-IMPLANTED VCSELS FOR 3-GB S DATA LINKS

Transverse single-mode and multimode intensity modulated butt-coupled VCSEL's are investigated as a light source for optical fiber communica tion systems, Data transmission at 3 Gb/s with a bit error rate (EER) of less than 10(-11) is reported for both 4.3 Irm of standard fiber, a s wed as 0.5 km of multimode graded-index fiber, 10-mu m active diamet er single-mode VCSEL's are shown to have lower mode competition noise requiring 3 dB and 6 dB less power at the front end receiver at a EER of 10(-11) compared to 19-mu m and 50-mu m active diameter devices, re spectively, In data transmission with multimode VCSEL's, the dispersio n penalty is lower than for single-mode sources since the noise at the receiver is mainly determined by transmitter-mode competition noise.