Beyond 100-Gbit/s/λ high-speed inter-data-center link composed by hybridly integrated electro-absorption modulator (EAM) and distributed feedback laser diodes (DFBLD)-based transmitter at 1306 nm, and received by a PIN-PD + TIA optical receiver is demonstrated to carry 104-Gbit/s pre-emphasized PAM-4 data for 2–10 km single mode fiber (SMF) propagation. The EAM + DFBLD transmitter offers an average power of −1.5 dBm, an excellent side mode suppression ratio of 53 dB, an on/off extinction ratio up to 10 dB, an analog bandwidth of 25 GHz, and a relative intensity noise of -137 dBc/Hz. The PIN-PD + TIA module exhibits 30-GHz receiving bandwidth. For on-off keying (OOK) format, the allowable data rates at 62 and 60/54 Gbit/s for BtB and 2-km/10-km SMF cases obtain receiving BER of 1.48 × 10−13 and 3.4 × 10−14/1.77 × 10−14 qualified for error-free telecommunication. Even at simulated inter-data center link, the receiving power sensitivity and power penalty at 54 Gbit/s can achieve −6.43/−6.26 dBm and 0.07/0.24 dB after 2-/10-km SMF propagation. To efficiently utilize the limited transmitter bandwidth, the directly encoded PAM-4 data transmission reveals qualified BER slightly enlarged from 1.4 × 10−4 to 2.3 × 10−4 when transferred from back-to-back to 2-km SMF transmission. Lengthening the distance to 10-km SMF degrades the maximal PAM-4 data rate to 50 GBaud with a received BER of 2.3 × 10−4 (less than KP4-FEC criterion). The 50 GBaud PAM-4 link provides receiving power penalty of 0.11/0.24 dB after 2-/10-km SMF propagation, which is attributed to the narrow-linewidth DFBLD responsible for extremely low RF fading effect under nearly zero dispersion condition. The transmitting frontend with amplitude/phase pre-emphasis function makes the receiving end compact and cost-effective, which exhibits the higher spectral usage efficiency of 4 bit/s/Hz and the better receiving sensitivity of −5.5 dBm at the lower power budget of 2.8 fJoule/bit than previous works.

中文翻译：

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基于 100-Gbit/s/λ EML 发射器和 PIN-PD+TIA 接收器的数据中心间链路

超过 100-Gbit/s/λ 的高速数据中心间链路由混合集成电吸收调制器 (EAM) 和基于分布式反馈激光二极管 (DFBLD) 的 1306 nm 发射器组成，并由 PIN-PD 接收+ TIA 光接收器被证明可以携带 104-Gbit/s 预加重 PAM-4 数据，用于 2-10 公里单模光纤 (SMF) 传播。EAM + DFBLD 发射机提供 -1.5 dBm 的平均功率、53 dB 的出色边模抑制比、高达 10 dB 的开/关消光比、25 GHz 的模拟带宽和 -137 的相对强度噪声分贝/赫兹。PIN-PD + TIA 模块具有 30-GHz 接收带宽。对于开关键控 (OOK) 格式，BtB 和 2-km/10-km SMF 情况下 62 和 60/54 Gbit/s 的允许数据速率获得 1.48 × 10-13 和 3.4 × 10-14 的接收 BER /1。77 × 10−14 符合无差错电信标准。即使在模拟的数据中心间链路中，在 2-/10-km SMF 传播后，54 Gbit/s 的接收功率灵敏度和功率损失也可以达到 -6.43/-6.26 dBm 和 0.07/0.24 dB。为了有效利用有限的发射机带宽，直接编码的 PAM-4 数据传输显示合格 BER 从 1.4 × 10-4 略微扩大到 2.3 × 10-4，当从背对背传输到 2 公里 SMF 传输时。将距离延长至 10 公里 SMF 会将最大 PAM-4 数据速率降低至 50 GBaud，接收 BER 为 2.3 × 10−4（小于 KP4-FEC 标准）。50 GBaud PAM-4 链路在 2-/10-km SMF 传播后提供 0.11/0.24 dB 的接收功率损失，这归因于窄线宽 DFBLD 在近零色散条件下导致极低的 RF 衰落效应。具有幅度/相位预加重功能的发射前端使接收端紧凑且具有成本效益，在较低的功率预算下表现出4 bit/s/Hz的更高频谱使用效率和-5.5 dBm的更好接收灵敏度比以前的作品 2.8 fJoule/bit。