Coding to alleviate intermodulation distortion in coherent optical FSK single-octave SCM systems

Abstract

The electrical and optical measurements were performed after the laser definition step, to test the uniformity of the device. All the measurements were performed at room temperature without heat sinking using a pulsed current source (200 ns pulse width, I O kHz repetition rate). Light was coupled out from the array through the substrate side. Light output against injection current was measured for all the VCSELs of the array (Fig. 3). The results are summarised in Figs. 4a and b. All the 1024 lasers were operating with a