We demonstrate the optical transmission of an 800 Gbit/s (4×200 Gbit/s) pulse amplitude modulation-4 (PAM-4) signal and a 480 Gbit/s (4×120 Gbit/s) on–off-keying (OOK) signal by using a high-bandwidth (BW) silicon photonic (SiP) transmitter with the aid of digital signal processing (DSP). In this transmitter, a four-channel SiP modulator chip is co-packaged with a four-channel driver chip, with a measured 3 dB BW of 40 GHz. DSP is applied in both the transmitter and receiver sides for pre-/post-compensation and bit error rate (BER) calculation. Back-to-back (B2B) BERs of the PAM-4 signal and OOK signal are first measured for each channel of the transmitter with respect to a variety of data rates. Similar BER performance of four channels shows good uniformity of the transmitter between different channels. The BER penalty of the PAM-4 and OOK signals for 500 m and 1 km standard single-mode fiber (SSMF) transmission is then experimentally tested by using one channel of the transmitter. For a 200 Gbit/s PAM-4 signal, the BER is below the hard-decision forward error correction (HD-FEC) threshold for B2B and below the soft-decision FEC (SD-FEC) threshold after 1 km transmission. For a 120 Gbit/s OOK signal, the BER is below SD-FEC threshold for B2B. After 500 m and 1 km transmission, the data rate of the OOK signal shrinks to 119 Gbit/s and 118 Gbit/s with the SD-FEC threshold, respectively. Finally, the 800 Gbit/s PAM-4 signal with 1 km transmission is achieved with the BER of all four channels below the SD-FEC threshold.

中文翻译：

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使用超过 100 Gbaud 的硅光子发射器在 1 公里单模光纤上进行 800 Gbit/s 传输

我们演示了 800 Gbit/s (4×200 Gbit/s) 脉冲幅度调制 4 (PAM-4) 信号和 480 Gbit/s (4×120 Gbit/s) 开关键控（ OOK) 信号通过使用高带宽 (BW) 硅光子 (SiP) 发射器在数字信号处理 (DSP) 的帮助下进行。在该发射器中，四通道 SiP 调制器芯片与四通道驱动器芯片共同封装，实测 3 dB 带宽为 40 GHz。DSP 应用于发送端和接收端，用于预/后补偿和误码率 (BER) 计算。PAM-4 信号和 OOK 信号的背靠背 (B2B) BER 首先针对发射机的每个信道相对于各种数据速率进行测量。四个信道的类似 BER 性能表明不同信道之间的发射机具有良好的一致性。然后使用发射机的一个信道对 500 m 和 1 km 标准单模光纤 (SSMF) 传输的 PAM-4 和 OOK 信号的 BER 损失进行实验测试。对于 200 Gbit/s PAM-4 信号，BER 低于 B2B 的硬判决前向纠错 (HD-FEC) 阈值，并在 1 公里传输后低于软判决 FEC (SD-FEC) 阈值。对于 120 Gbit/s OOK 信号，BER 低于 B2B 的 SD-FEC 阈值。经过 500 m 和 1 km 传输后，OOK 信号的数据速率在 SD-FEC 阈值下分别收缩到 119 Gbit/s 和 118 Gbit/s。最后，以低于 SD-FEC 阈值的所有四个信道的 BER 实现 800 Gbit/s PAM-4 信号的 1 公里传输。