Comparing the Dual-Mode VCSEL in OM4-MMF and GI-SMF Links for NRZ-OOK and 16-QAM-OFDM Transmissions
Comparing the Dual-Mode VCSEL in OM4-MMF and GI-SMF Links for NRZ-OOK and 16-QAM-OFDM Transmissions
复制标题
比较 OM4-MMF 和 GI-SMF 链路中用于 NRZ-OOK 和 16-QAM-OFDM 传输的双模 VCSEL
DOI：
10.1109/jphot.2022.3168626
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Lin Gong-Ru
中科院分区：
文献类型：
--
作者：
Lee Shao-Yung;Cheng Chih-Hsien;Tseng Hsien-Yao;Chen Xin;Lo Wei-Chi;Li Kangmei;Wang Chia-Hsuan;Tsai Cheng-Ting;Kuo Hao-Chung;Li Ming-Jun;Lin Gong-Ru
研究了一种双模垂直腔面发射激光器（VCSEL），用于非归零开关键控（NRZ-OOK）和正交幅度调制-正交频分复用（QAM-OFDM）的高速数据传输。在使用OM 4多模光纤（OM 4-MMF）或渐变折射率单模光纤（GI-SMF）的背靠背（BtB）和100-m传输情况下，带透镜的MMF拾取头的芯直径与DM-VCSEL输出的模场之间的失配控制耦合横模数目并减小模色散效应。使用预加重的NRZ-OOK数据可以补偿SNR的下降，使DM-VCSEL以53 Gbit/s传输NRZ-OOK数据时，BtB下的BER提高到5.6 × 10− 12，100-m GI-SMF后的BER提高到6.9 × 10− 10。对于16-QAM OFDM传输，在BtB和100-m GI-SMF情况下，预均衡算法都比预加重算法显示出更好的数据补偿。通过对以0.4 dB/GHz斜率编码到DM-VCSEL的16-QAM OFDM数据进行预调平补偿，DM-VCSEL允许BtB传输136 Gbit/s，100 m OM 4-MMF传输112 Gbit/s，100 m GI-SMF传输92 Gbit/s。由DM-VCSEL承载的预加重NRZ-OOK和预均衡16-QAM OFDM数据可以在未来用于超高速数据中心内链路。
A dual-mode (DM) vertical-cavity surface-emitting laser (VCSEL) is investigated for carrying high-speed data transmission with either the non-return-zero on-off keying (NRZ-OOK) or the quadrature amplitude modulation-orthogonal frequency division multiplexing (QAM-OFDM) format. In both the back-to-back (BtB) and the 100-m transmission cases with using either the OM4 multimode fiber (OM4-MMF) or the graded-index single-mode fiber (GI-SMF), the mismatch between the core diameter of the lensed MMF pick-up head and the mode field of the DM-VCSEL output controls the coupled transverse mode number and decrease the modal dispersion effect. Using pre-emphasized NRZ-OOK data can compensate the SNR degradation to improve the BER to 5.6 × 10−12under BtB and 6.9 × 10−10after 100-m GI-SMF for the DM-VCSEL delivered NRZ-OOK data at 53 Gbit/s. For 16-QAM OFDM transmission, the pre-leveling algorithm shows better data compensation than the pre-emphasis algorithm in both BtB and the 100-m GI-SMF cases. With the pre-leveling compensation of the 16-QAM OFDM data encoded to the DM-VCSEL with a 0.4-dB/GHz slope, the DM-VCSEL allows 136 Gbit/s for BtB, 112 Gbit/s for 100-m OM4-MMF, and 92 Gbit/s for 100-m GI-SMF transmissions. The pre-emphasis NRZ-OOK and the pre-leveling 16-QAM OFDM data carried by the DM-VCSEL can be used in ultrahigh-speed intra-data-center links in the future.