Abstract

Highly efficient rectangular pulse emission is significant in high energy O-band applications due to the zero dispersion of standard telecom optical fiber in the second telecommunication window. The rectangular pulse emission offers the peak power clamping, which avoids wave-breaking and maintains the fundamental repetition frequency with arbitrarily widened temporal pulse width of ultrafast laser at high pump powers. The current technology in the O-band rectangular pulse emission achieves the maximum pulse energy of ∼30 nJ with an efficiency of ∼1.06%. Here, we fabricated a single-mode bismuth-doped phosphosilicate optical fiber by the modified chemical vapour deposition technique. The Bi-doped phosphosilicate optical fiber was characterized by a peak absorption of ∼0.6 dB/m at 1250 nm and a high gain coefficient of ∼0.22 dB/m at 1320 nm. These parameters contribute to the generation of rectangular pulse with a pump power threshold of ∼227.7 mW in a figure-of-nine laser cavity. The maximum pulse energy was achieved as ∼197.7 nJ, whereas the laser efficiency is ∼14.3%. We presented an O-band rectangular pulse emission with the highest pulse energy and efficiency as compared to previous studies, whilst its all-fiber laser setup is robust and feasible for high pulse energy applications.

Dark rectangular noise-like pulses in a figure-nine fiber laser based on a nonlinear amplifying loop mirror

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Investigation of dispersion-managed, polarization-maintaining Er-doped figure-nine ultrashort-pulse fiber laser

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Opt. Express 27(14) 19218-19232 (2019)

Study on the temperature dependent characteristics of O-band bismuth-doped fiber amplifier

Y. Wang, N. K. Thipparapu, S. Wang, P. Barua, D. J. Richardson, and J. K. Sahu
Opt. Lett. 44(23) 5650-5653 (2019)

Near 0.5 dB gain per unit length in O-band based on a Bi/P co-doped silica fiber via atomic layer deposition

Yan Chen, Weiqi Wang, Yuanyuan Yang, Jianxiang Wen, Yanhua Dong, Yana Shang, Yanhua Luo, and Tingyun Wang
Opt. Express 31(9) 14862-14872 (2023)

Bi-doped fiber amplifiers and lasers [Invited]

N. K. Thipparapu, Y. Wang, S. Wang, A. A. Umnikov, P. Barua, and J. K. Sahu
Opt. Mater. Express 9(6) 2446-2465 (2019)