Hollow-Core NANF for High-Fidelity and Low-Latency Transmission at 2-Micron Waveband
Xuelin Zhang, Jiangbing Du, Peng Li, Lei Zhang, Yange Liu, Zuyuan He
Abstract
In recent years, the emerging 2-<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m waveband has gained increasing interest as an extended transmission window. The attenuation of hollow-core nested antiresonant nodeless fiber (NANF) ceaselessly reduces, appreciably better than that of standard single-mode fiber (SSMF) at most wavelengths of commercial and scientific interest including 1550 nm. In this work, high-fidelity and low-latency hollow-core NANF transmission at 2-micron waveband is demonstrated for the first time, with intensity-modulation-direct-detection (IMDD) transmission distance of 850 m at 56 Gbps and 100 m at 112 Gbps based on adaptively-loaded discrete multi-tone (DMT) modulation and 4-ary pulse-amplitude modulation. Compared to the SSMF and hollow-core photonic bandgap fiber (HC-PBGF) of the same length, the homemade NANF exhibits excellent modal purity with a competitive zero-penalty-approaching bit error rate (BER) performance. Allowing beyond 100 Gbps/lane penalty-free transmission relative to the back-to-back makes NANF highly attractive for low-latency communication systems and high-fidelity applications of versatile optical signals apart from digital pulses.