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We demonstrate 100 Gb/s/ $\lambda $ duo-binary PAM-4 (DB-PAM-4) transmission over 50 km standard single-mode fiber (SMF) in the O-band using a 20G silicon-based transmitter and a 25G optically-amplified PIN+TIA-based receiver for 100G PON downstream applications. Receiver sensitivities of −15, −14.5 and −12 dBm are achieved at a bit error rate (BER) below the low-density parity-check forward error correction (LDPC-FEC) threshold (i.e., $1\times 10^{-2}$) in back-to-back (B2B), and after 20 and 50 km, respectively using a 131-tap linear feed-forward equalizer (FFE) at the receiver. According to the results, a power budget of 20 dB can be achieved for 20 km transmission. Furthermore, we report the performance of 99 Gb/s (33 Gbaud) PAM-8 transmission and show that DB-PAM-4 provides 5.3 dB better sensitivity compared to PAM-8 at the LDPC-FEC threshold. [ABSTRACT FROM AUTHOR]

We demonstrate 25 and 50 Gb/s four-level pulse amplitude modulation (PAM-4) transmission over 43- and 21-km standard single-mode fiber (SMF), respectively, using a silicon photonic 120° hybrid-based integrated simplified coherent receiver in the $C$ -band. The integrated receiver is composed of an edge coupler, a vertical grating coupler, a polarization splitter–rotator, a $3\times 3$ multimode interference coupler-based 120° hybrid, and three germanium p-i-n photodetectors. For 25 Gb/s PAM-4 transmission, we achieved the receiver sensitivities of −18, −17.5, −16.6, −14.5, and −9.8 dBm in back-to-back (B2B) and after 10.5, 21, 31, and 43 km, respectively, at a bit error rate (BER) below the hard-decision forward error correction (HD-FEC) threshold (i.e., $3.8\times 10^{-3}$) without using any receiver equalizer, while for the 50 Gb/s PAM-4 transmission, the receiver sensitivities of −13.6 dBm in B2B, and −13.5 and −11.6 dBm after 10.5 and 21 km are obtained using a 31-tap linear feed-forward equalizer (FFE), respectively. Furthermore, we achieved up to 44 Gb/s receiver equalizer-free PAM-4 transmission over 10.5 km below the HD-FEC. The characterization of the receiver at different wavelengths within the $C$ -band is provided as well. [ABSTRACT FROM AUTHOR]

We demonstrate 25-Gbit/s four-level pulse amplitude modulation transmission over 28-km standard single-mode fiber using an off-the-shelf 10-Gbit/s electro-absorption modulated laser and a $3\times3$ fiber splitter based simplified coherent receiver in the $C$ -band. No digital signal processing and dispersion compensation have been used either at the transmitter or at the receiver. Furthermore, the use of an intensity modulated signal allows us to avoid the phase and frequency locking of the local oscillator. We achieved receiver sensitivities of −18.25, −17, and −13.4 dBm at a bit error rate below the hard-decision forward error correction threshold (i.e., $3.8\times 10^{-3}$) and power budgets of 20.80, 19.55, and 15.95 dB in back-to-back, after 20.7 and 28 km, respectively. We also demonstrate polarization independent operation by slightly modifying the architecture of the simplified coherent receiver. [ABSTRACT FROM AUTHOR]