TWDM-PON With Signal Remodulation and Rayleigh Noise Circumvention for NG-PON2

C. W. Chow, C. H. Yeh, K. Xu, J. Y. Sung, H. K. Tsang
2013 IEEE Photonics Journal  
We propose and demonstrate a 40-Gb/s (4 Â 10 Gb/s) downstream and 10-Gb/s (4 Â 2.5 Gb/s) upstream time-wavelength-division-multiplexed passive optical network (TWDM-PON) using signal remodulation. Here, a downstream differential-phase-shiftkeying (DPSK) signal and an upstream remodulated carrier-suppressed single-sideband non-return-to-zero (CS-SSB-NRZ) signal are used, which are wavelength shifted to circumvent Rayleigh backscattering (RB). A silicon-based optical microring resonator (MRR)
more » ... er is preinstalled at the optical networking unit (ONU) to select the desired downstream wavelength and simultaneously demodulate the downstream DPSK signal, which is then detected by a monolithic-integrated germanium-on-silicon (Ge-Si) photodiode (PD). Using silicon-based devices could be cost effective for the cost-sensitive ONU. The future monolithic integration of a silicon filter, a silicon detector, and a silicon modulator in the ONU is also discussed. The characteristics of the preinstalled silicon-based MRR and the Ge-Si PD are discussed. Error-free transmission (bit-error rate (BER) G 10 À9 ) is achieved in both downstream and remodulated upstream signals after propagating through 20 km of standard single-mode fiber (SMF). Index Terms: Optical communications, noise mitigation, wavelength-division-multiplex passive optical network (WDM-PON), differential-phase-shift-keying (DPSK).
doi:10.1109/jphot.2013.2285723 fatcat:f7vh5nqnijetjmr5af66qb4rba