Optoelectronic integrated circuits for telephony/broadband passive optical (TPON/BPON) networks: design and experimental results

I . Objective and Background. The objective of this work is to develop a high yield, process tolerant optoelectronic integration scheme and to apply this to circuits for optical subscriber access links. The advantages of using optoelectronic integrated circuits (OEICs) in such applications are potentially low cost, flexibility in optical circuit function and minimal size. We report here on our integration process, which incorporates DFB lasers, monitor photodiodes, 3dB couplers and wavelength duplexers ( l ) , and present our design for an OEIC for the TPONDPON local network configuration based on this process. Our process incorporates a butt join for the laser-waveguide integration allowing flexibility in the design of the waveguide and use of undoped material for low waveguide loss and heavy doping for low series resistance in the laser.