Analoge and digital signal transmission utilizing GPON-CWDM based RoF over long distance

Review of physical layer networking for optical-wireless integration

“…Using CWDM networking technology in an optical-wireless integrated architecture enables the wireless signals to be carried by a separate CWDM channel compared to that for PON traffic. 36 This enhances signal isolation and also enables more dedicated bandwidth allocation for wireless application. In this architecture, the wireless and PON signals are multiplexed in the headend or OLT before they are distributed via the feeder fiber to an RN that consists of a CWDM multiplexer/demultiplexer (MUX/DEMUX).…”

“…55 (3) Lim, Lee, and Nirmalathas: Review of physical layer networking for optical-wireless integration technology is the multiplexer and demultiplexer that are used to combine and separate the various signals. There have been many different techniques introduced including using an optical interleaver 36,37 and arrayed waveguide grating 38 to maximize the channels' isolation while seamlessly adding and dropping these multiband wireless channels and PON signals. In addition, it is also essential that these integration schemes introduce minimum changes and disruption to existing infrastructure setup for effective integration.…”

“…32,[36][37][38][39][40] To ensure seamless integration, the enabling Fig. 8 Hybrid fiber-wireless integration based on CWDM-PON.…”