Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC

Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC

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Data center interconnections are cost-sensitive.We propose and demonstrate a cost-effective C-band intensity modulation direct detection (IM/DD) transmitter for extended range (ER) inter-datacenter interconnects utilizing only a 2-bit digital-to-analog converter (DAC).Tomlinson-Harashima precoding (THP) is used in transmitter DSP to compensate for dispersion-induced impairments.Due to the uniform distribution of signal levels after THP encoding, a high-resolution DAC is required to generate electrical signals.The hardware cost of the transmitter can be significantly reduced by compressing the physical number of bits (PNOB) of emma shipley fabric sale the DAC to 2 bits.

We quantize the signal to 4 levels and utilize up-sampling and noise shaping to greatly reduce the in-band quantization noise.The in-band signal to noise ratio (SNR) can be increased to 23 dB.We experimentally demonstrate a cost-effective 40-Gbaud probabilistic shaping PAM-4 C-band IM/DD transmission over 50-km utilizing only a 2-bit DAC in the transmitter without any optical dispersion compensation.The performance of the proposed scheme is proximate to the common case of using an 8-bit DAC.It has a BER gap of about 2 × 10−3 only when the received optical charger for dell latitude 3520 power (ROP) is higher than −6 dBm.