Large-Mode-Area Multi-Resonant All-Solid Photonic Bandgap Fiber with Low Bending Loss and Robust Single-Mode Operation

13 Pages Posted: 18 Oct 2021

See all articles by Xiao Chen

Xiao Chen

National University of Defense Technology

Liangjin Huang

National University of Defense Technology

Huan Yang

National University of Defense Technology

Xiaoming Xi

National University of Defense Technology

Yi An

National University of Defense Technology

Zhiping Yan

National University of Defense Technology

Yisha Chen

National University of Defense Technology

Zhiyong Pan

National University of Defense Technology

Pu Zhou

National University of Defense Technology

Date Written: 2021

Abstract

In this paper, we have theoretically and experimentally demonstrated a novel large-mode-area multi-resonant all-solid photonic bandgap fiber (AS-PBGF). Based on the combination of the multi-resonant structure and leakage channel, the structural parameters are specifically designed for conventional applications of fiber lasers around 1 μm wavelength. Through the stack and draw technique, the fiber is fabricated successfully and the hexagon core is measured to be 46 μm in the corner-to-corner direction. The transmission spectrum exhibits a broad bandwidth from 970 nm to 1180 nm in the 3rd photonic bandgap (PBG). Bending loss lower than 0.1 dB/m with a 5-m-length fiber is obtained in the case of bending radius R > 25 cm. By employing the spatially and spectrally resolved imaging (S2) method, robust single-mode (SM) operation of the fiber is verified within the whole PBG. In addition, we also report a phenomenon about the abnormal variation of M2 within the low loss region of the 3rd PBG. The evolution of beam quality within the 3rd PBG appears as a U-shaped curve rather than a constant. Based on the measured M2 and S2 results, a preliminary conclusion about the relationship between the beam quality and SM characteristics in AS-PBGF, which is quite different from that in conventional SIFs, is demonstrated experimentally for the first time.

Keywords: Large mode area, all-solid photonic bandgap fiber, low bending loss, single mode, photonic bandgap, beam quality factor.

Suggested Citation

Chen, Xiao and Huang, Liangjin and Yang, Huan and Xi, Xiaoming and An, Yi and Yan, Zhiping and Chen, Yisha and Pan, Zhiyong and Zhou, Pu, Large-Mode-Area Multi-Resonant All-Solid Photonic Bandgap Fiber with Low Bending Loss and Robust Single-Mode Operation (2021). Available at SSRN: https://ssrn.com/abstract=3944527 or http://dx.doi.org/10.2139/ssrn.3944527

Xiao Chen (Contact Author)

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Liangjin Huang

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Huan Yang

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Xiaoming Xi

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Yi An

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Zhiping Yan

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Yisha Chen

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Zhiyong Pan

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

Pu Zhou

National University of Defense Technology ( email )

Changsha Hunan, 410073
China

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