Symmetrical 50-Gb/s/λ PAM-4 TDM-PON in O-band with DSP and Semiconductor Optical Amplifier Supporting PR-30 Link Loss Budget

Coherent ONU Designs for 50 Gb/s/λ PON

“…Nevertheless, a DD Rx using a SOA offers 4.9 dB (-26.31 dBm) less than that of Alamouti-HetRx using a PIN PD. Furthermore, 4-PAM O-band transmission experiments achieving a sensitivity of -25 dBm using DSP-DD TRx with a SOA-PIN PD [20], -20 dBm using pre-/postequalisation and an APD [21], and -19.2 dBm using machine learning and an APD [22] over 20 km of SSMF have been recently reported. These demonstrations present the feasibility of 50G ONU DD TRxs using various DSP techniques whilst avoiding an excessive increase in complexity compared to the 25G optical hardware.…”

Low Complexity DSP for High Speed Optical Access Networking

“…On this topic, the Institute of Electrical and Electronics Engineers (IEEE) 802.3cs super PON standard under development supports a 50 km reach and a larger than 1:64 split ratio but requires a wavelength router in the field. As the attractiveness of PONs is very sensitive to cost and power consumption, it is highly desirable that high speed PONs leverage the optical component ecosystem of today's mature 10 Gb/s PONs, where intensive efforts have been made by the research community [3][4][5][6][7][8][9][10][11][12][13][14]. Higher spectrally efficient modulation schemes and advanced digital signal processing (DSP) must be employed to achieve such targets.…”

Optical Power Budget Enhancement in 50–90 Gb/s IM-DD PONs With NOMA-CAP and SOA-Based Amplification

“…Hence, to increase both the data rate and the optical reach by increasing the optical power budget, NOMA-CAP must be combined with optical amplification, including semiconductor optical amplifiers (SOAs) or erbium doped fiber amplifiers (EDFAs). Recently, SOAs have attracted more attention due to the large optical bandwidth for booster amplification and pre-amplification applications in 25G EPON and beyond [9,10], besides the small size and the ability to be integrated with other optical devices. Nevertheless, SOAs may have an impact on the data pattern quality due to its fast-dynamic gain, i.e., the patterning effect, and nonlinearities [10].…”