Low noise figure bismuth-doped fiber amplifier based on Sagnac comb filter

Wenqiang Hou; Li Pei; Jingjing Zheng; Jianshuai Wang; Xiao Ye; Dingchen Wang; Lihong Wang; Fuhao Zhang

doi:10.1117/12.3007352

24 November 2023 Low noise figure bismuth-doped fiber amplifier based on Sagnac comb filter

Wenqiang Hou, Li Pei, Jingjing Zheng, Jianshuai Wang, Xiao Ye, Dingchen Wang, Lihong Wang, Fuhao Zhang

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129351Z (2023) https://doi.org/10.1117/12.3007352
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

This paper presents a double-pass low-noise bismuth-doped fiber amplifier based on a Sagnac comb filter. The amplifier utilizes a Sagnac loop to filter out spontaneous emission light outside the signal wavelength, effectively decreasing the noise figure. Experimental results show that the amplifier achieves a minimum noise figure of only around 3.7 dB. Moreover, its gain bandwidth can cover a significant portion of the O-band. Under a forward pump power of 0.538 W, with an input signal power of -30 dBm, the amplifier can reach a gain of 29.6 dB, while the noise figure is only approximately 4 dB. Under backward pump, the gain difference for different input signal powers is larger compared to forward pump. We also studied the variation of gain with input signal power at a pump power of 0.5 W, using both forward and backward pump methods. The results indicate that the pump direction has a minor impact on the gain but significantly affects the noise figure, with the noise figure under forward pump being 1-2 dB lower than that under backward pump. Additionally, the amplifier exhibits a maximum saturation output power of approximately 9.5 dBm. In conclusion, this amplifier has great potential for application in WDM communication systems.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wenqiang Hou, Li Pei, Jingjing Zheng, Jianshuai Wang, Xiao Ye, Dingchen Wang, Lihong Wang, and Fuhao Zhang "Low noise figure bismuth-doped fiber amplifier based on Sagnac comb filter", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129351Z (24 November 2023); https://doi.org/10.1117/12.3007352

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KEYWORDS

Fiber amplifiers

Silicates

Emission wavelengths

Spontaneous emission

Optical amplifiers

Reflection

Signal attenuation

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