100 Gbaud 4PAM Link for High Speed Optical Interconnects

Real-time 100 Gbps/λ/core NRZ and EDB IM/DD Transmission over 10 km Multicore Fiber

“…A six-tap analog feedforward equalizer (FFE) at the TX side is used to compensate the frequency roll-off and dispersion induced inter-symbol-interference in the link. A 50 GHz RF amplifier is used to drive a C-band 100 GHz distributed feedback electro-absorption modulated laser (DFB-EAM) [6]. The DFB-EAM driven by 117.0 mA and biased at −1.85 V, emits at 1548.7 nm.…”

High Speed PAM-8 Optical Interconnects with Digital Equalization based on Neural Network

“…The DAC output signal was linearly amplified to 2.2 Vpp prior to modulating a 1550 nm EML. The EML used in the experiment consists of a high power distribute-feedback (DFB) laser and an InGaAsP travelling wave electroabsorption modulator (TWEAM), both monolithically integrated and with a 3-dB bandwidth of >100 GHz [7]. The EML is biased at -1.6 V with a linear operational swing of the larger than 2 Vpp, ensuring low-distortion modulation of the PAM-8 signal.…”

Impact of Phase-Filtering on Optical Spectral Reshaping with Microring Resonators for Directly-Modulated 4-PAM Signals

“…The need for high-speed connectivity in datacenter environments is driving a significant effort in researching compact, low-cost and energy efficient solutions [1,2]. One of the proposed solutions relies on the use of directly modulated lasers (DMLs), thus replacing the need for external modulators.…”