We evaluate possibility of utilizing the mode-field matched center-launching (MCL) technique in the 850-nm band. For this purpose, we realize the MCL technique by fusion-splicing the HI-780 pigtail fiber of the transmitter to the OM2-type transmission multi-mode fiber (MMF). The results show that we can achieve the high coupling efficiency of >92% by optimizing the splicing conditions such as the arc-discharge duration and fiber-push distance. We confirm that, in the case of utilizing the MCL technique, the frequency-response characteristics of the MMF link becomes almost identical to that of the single-mode fiber (SMF) link. As a result, we could demonstrate the successful transmission of 112-Gb/s four-level pulse amplitude modulation (PAM4) signal operating at 852 nm over 1 km of the OM2-type MMF by utilizing the MCL technique. The performance of this link is measured to be very stable even in the presence of the mechanical perturbations such as fiber bending and fiber shaking.

中文翻译：

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112-Gb/s PAM4 传输超过 1 公里的 MMF，在 850-nm 频段具有模场匹配中心发射

我们评估了在 850 nm 波段使用模场匹配中心发射 (MCL) 技术的可能性。为此，我们通过将发射器的 HI-780 尾纤熔接到 OM2 型传输多模光纤 (MMF) 来实现 MCL 技术。结果表明，通过优化电弧放电持续时间和光纤推入距离等熔接条件，我们可以实现>92%的高耦合效率。我们确认，在使用 MCL 技术的情况下，MMF 链路的频率响应特性几乎与单模光纤 (SMF) 链路的频率响应特性相同。因此，我们可以证明使用 MCL 技术在 1 公里的 OM2 型 MMF 上成功传输 852 nm 的 112-Gb/s 四级脉冲幅度调制 (PAM4) 信号。