Details

Autor(en) / Beteiligte

• Zhuang, Mingjuan
• Tu, Jiajing
• Wang, Dawei
• Gao, Shecheng
• Shen, Lei
• Luo, Jie
• Liu, Weiping
• Li, Zhaohui

Titel

Multi-step-index fiber with a large number of weakly coupled OAM mode groups for IM/DD systems in data centers: design, fabrication, and characterization

Ist Teil von

• Optics letters, 2023-11, Vol.48 (22), p.6036-6039

Ort / Verlag

Washington: Optical Society of America

Erscheinungsjahr

2023

Quelle

OSA Publishing

Beschreibungen/Notizen

• Mode division multiplexing (MDM) technique based on weakly coupled few-mode fibers (FMF) is promising to enhance the capacity of short-reach transmission. We design and fabricate a multi-step-index FMF (MSIF), which supports weakly coupled first-order radial orbital angular momentum mode group (OAM l ,1 MG) for MDM transmission. We use three layers of core to regulate the minimum effective refractive index difference (min|Δ n eff |) between OAM l ,1 MG and the adjacent MGs. In experiments, we demonstrate that the fabricated MSIF can support up to OAM 6,1 with the interferometric method, and the loss measured by an optical time-domain reflectometer (OTDR) can achieve <0.5 dB/km for the OAM l ,1 with an order from | l | = 0 to | l | = 6. The inter-mode-group cross talk (XT) is tested by the power measurement, and the system-level XT after 20 km fiber transmission in the worst case is about −11.1 dB.