Abstract
To form a low noise figure and uniform shortpass band in optical fiber communications an improved automatic filtered power control (AFPC) pumping method is proposed here. A modulated single laser signal was entered in a closed feedback loop, in which the erbium-doped fiber amplifier (EDFA) was used as a part of the AFPC loop. Owing to the constant filtered signal and the quadrature phase shift delay inside the feedback loop, an optical pass band was uniformly formed. This EDFA attains high performance with a low noise figure simultaneously. The method was successfully applied to the fabrication of practical 12.0 m length of erbium-doped fiber pumped at 980 nm wavelength and 20 dBm power. Experiments prove that the signal gain of the loop remain flat in the range of 18.2 to 22.4 dB with a worst case error of ±0.5 dB and the noise figure was reduced by 2.2 dB at optimal, which correspond to a shortpass range of 40 nm band pass from 1525 nm to 1565 nm in wavelength. Of course, it should be possible to extent the system performance to all pumping configurations for semiconductor optical amplifiers. This provides the simplest and most economical way to transmit a well-defined band of modulated laser signal and to reject all other unwanted radiation.
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Acknowledgement
This work was supported by the National Science Council, Taipei, Taiwan, and Republic of China under contract no. NSC96-2815-C-236-002-E.
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Shen, JL., Huang, HM., Lee, YC. et al. Improved Automatic Filtered Power Control Pumping Method for Uniform Shortpass Band in Optical Fiber Communications. J Infrared Milli Terahz Waves 30, 44–50 (2009). https://doi.org/10.1007/s10762-008-9427-9
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DOI: https://doi.org/10.1007/s10762-008-9427-9