Bidirectional colorless wired and wireless WDM-PON with improved dispersion tolerance for radio over fiber

10-Gb/s Access Network Architecture Based on Micro-Ring Modulators With Colorless ONU and Mitigated Rayleigh Backscattering

“…The data carried by the modulated sideband is detected for downstream wired service while the CW-like unmodulated sideband is remodulated with DPSK by a phase modulator for upstream transmission. It is worth to mention that in parallel, a data-modulated mm-wave carrier can be created for wireless service by heterodyne detection using a high-speed photodetector since the two sidebands are coherent [3]- [5], [9], [10]. At the central office, a common DI demodulates all the upstream DPSK signals due to its periodic frequency response.…”

“…However, the scheme required additional laser diodes to provide the continuous wave (CW) carriers. Single-sideband (SSB) modulation can provide a downstream signal, a CW carrier distributed centrally for upstream remodulation as well as support radio-over-fiber [3]- [5]. However, SSB modulation schemes aforementioned are typically complicated due to the difficulties in optical sideband separation/combination, polarization alignment, power equalization and control of differential propagation delay.…”

40-GHz ROF downlink system with SFP modules

“…However, direct modulation technique is always seen as a simpler and cheaper solution. To date, there have been many proposals to combine ROF and FTTH as a hybrid system to bring out the best of both optical and RF system as well as sharing common infrastructure for fast service deployment. Furthermore, most of the current FTTH systems are using direct modulation technique to modulate high‐speed electrical pulse data into the optical domain due to its simplicity and cost factors as mentioned previously.…”