Low‐cost fibre‐chip coupling for electro‐optic EMC‐probes

Abstract

A straightforward flip‐chip mounting technique is described using gold bumps, a silicon motherboard and non‐conductive adhesives to fabricate electro‐optical modules coupling light from arrays of laser diodes into arrays of fibres. This enables the fabrication of non‐hermetic, potentially cheap modules for short‐distance, parallel‐optical interconnection. As an application, the realisation of a compact, active electro‐optical dipole and loop probe is presented. During assembly of the probes, attention was paid to sensitivity, susceptibility to interfering electromagnetic fields and to high‐frequency behaviour. The probes show sensitivities comparable with, or better than, conventional probes of the same size. They show a linear dynamic behaviour of at least 60dB, and measure electric fields up to 30mV/m or magnetic fields up to 0.1mA/m, respectively. The antenna signal modulates the optical signal of a biased laser diode, and because all the spectral information of the electromagnetic field is preserved during measurement, these probes are excellent instruments for diagnostic EMC‐measurements with a high spatial resolution.

Citation

Vanwassenhove, L. (1998), "Low‐cost fibre‐chip coupling for electro‐optic EMC‐probes", Microelectronics International, Vol. 15 No. 1, pp. 32-34. https://doi.org/10.1108/13565369810199095