Noise Reduction Technique using Multiple Photodiodes in Optical Receivers for POF Communications

This paper presents a technique to increase the sensitivity of optical receivers with a large integrated photodiode (PD). It consists of manufacturing the PD in several pieces, instead of a single device, and connecting a transimpedance amplifier (TIA) to each of these pieces. The output signals of the TIAs are combined achieving a higher signal-to-noise ratio than with the traditional approach. This work shows a remarkable improvement of the sensitivity and transimpedance using a well-known TIA configuration without the need of additional modifications or compensation techniques. The results show an increase in sensitivity of 7.8 dB and in transimpedance of 8.7 dB when dividing the PD in 16 pieces. The proposed technique can be applied to any TIA design and is independent of the core amplifier structure, which means it is compatible with every technology that allow the integration of PDs.

Automated summary

This technique increases the sensitivity of optical receivers by manufacturing the photodiode in multiple pieces and connecting a transimpedance amplifier to each piece. The results show significant improvement in sensitivity and transimpedance without the need for additional modifications or compensation techniques. Compatible with any TIA design, this technique offers increased signal-to-noise ratio.