A low‐cost passive optical network for television broadcasting and high‐speed bidirectional communications in intelligent buildings

Abstract

In this paper, a low-cost passive optical network scheme is presented for intelligent buildings located in areas having difficulty with wireless signal reception. The network can simultaneously broadcast digital-video-broadcasting-terrestrial (DVB-T) signals and can transmit high-speed data bidirectionally using a Fabry-Pérot laser diode (FP-LD) injection-locked by a vertical cavity surface-emitting laser (VCSEL). Results are shown for the broadcast of DVB-T signals over an 1-km multimode fiber (MMF) and for non-return-to-zero (NRZ) data over a 25-km single mode fiber (SMF). Downstream and upstream transmission bit rates are 10 Gbps and 1.25 Gbps, respectively. Maintaining TV signal quality at 40%, receiver sensitivities are -20.2 dBm and -22.58 dBm for downstream and upstream transmissions, respectively. In addition, the constraint of injection-locking and the limitation of optical power are also analyzed.