Abstract

In this article, we report erbium/ytterbium (Er/Yb) co-doped phospho-alumino-silicate fibers (EYDFs) fabricated by the modified chemical vapor deposition (MCVD) and solution doping technique, to extend the L-band gain up to 1625 nm. Fibers with different doping concentrations and Yb-to-Er ratios were studied in terms of the spectroscopic properties and optical amplification in the L-band when pumped at 1480 nm. A higher Yb-to-Er ratio suppressed the signal-induced excited-state absorption (ESA) effect and also improved the amplifier gain in the L-band. A maximum gain of 15.5 dB at 1625 nm was achieved for the fiber with an Yb-to-Er ratio of 3.5. The gain coefficient was 0.039 dB/mW and the saturation output power was 21.5 dBm at 1600 nm. On the other hand, one highly doped fiber with the Er₂O₃ concentration of 0.5 mol% and an Yb-to-Er ratio of 2 was demonstrated to have the controlled Er concentration quenching and a reduced amplifier device length, exhibiting 12.9 dB gain and 6.3 dB noise figure (NF) at 1625 nm, with <5.8 dB NF from 1575 to 1623 nm. What's more, the temperature-dependent amplifier performance was studied, over the temperature range of −60 to 80 °C. The temperature-dependent-gain (TDG) coefficient and its zero-point wavelength were reported. An increased L-band gain was achieved by cooling the fiber.

High-efficiency cladding-pumped Er/Yb co-doped alumino-phosphosilicate fiber for an extended L-band amplification

Le He, Yang Chen, Xiaoke Yin, Zhimu Gu, Shaokun Liu, Wenzhen Li, Yingbin Xing, Yingbo Chu, Nengli Dai, and Jinyan Li
Opt. Lett. 49(1) 61-64 (2024)

Extended L-band 4-Core Er/Yb co-doped fiber amplifier based on 1018 nm cladding pumping

Le He, Qiang Qiu, Xiaoke Yin, Zhimu Gu, Shaokun Liu, Wenzhen Li, Yingbin Xing, Yingbo Chu, Nengli Dai, and Jinyan Li
Opt. Express 31(16) 25557-25570 (2023)

Er-doped silicate fiber amplifiers in the L-band with flat gain

Yan Sun, Xin Wang, Qiubai Yang, Yafei Wang, Fan Wang, Lili Hu, Chunlei Yu, Meisong Liao, and Shubin Chen
Opt. Lett. 49(4) 989-992 (2024)

Extending the L-band amplification to 1623 nm using Er/Yb/P co-doped phosphosilicate fiber

Yang Chen, Yang Lou, Zhimu Gu, Qiang Qiu, Le He, Wenzhen Li, Xiaoke Yin, Xinyue Zhao, Shaokun Liu, Jinggang Peng, Haiqing Li, Yingbin Xing, Yingbo Chu, Nengli Dai, and Jinyan Li
Opt. Lett. 46(23) 5834-5837 (2021)

Flat-gain L-band amplifier containing AlPO₄ units in aluminophosphosilicate erbium-doped fibers

Ziwei Zhai, Arindam Halder, and Jayanta K. Sahu
Opt. Lett. 48(21) 5579-5582 (2023)