| Summary: | 碩士 === 國立東華大學 === 電機工程學系 === 102 === In this paper, we investigated the characteristics of the wavelength converter in a multi-pump condition. For the experiment framework, we constructed three different structures those were backward pump ring cavity, a bidirectional pump ring cavity, and a backward pump linear cavity by using highly non-linear fiber (HNLF) as the medium fiber and choosing different pump of wavelengths and power to achieve the wavelength converter for a broadband flatten conversion efficiency.
First in backward-pumping ring cavity, we got the 10nm flatness (1560~1570nm) and -20dB conversion efficiency in single pump(1465nm, 310mw). In the best configuration of multi-pump, we got the broadband flatten conversion efficiency by 25nm (1550~1575nm) and the least conversion efficiency by -7.72dB, and the flatness is 1.44dB.
Second in bidirectional-pumping ring cavity, the result of the bidirectional-pumping ring cavity was smaller flat ranges of conversions and higher conversion efficiency than the result of the backward-pumping ring cavity. In the best configuration of multi-pump, we got a flatten conversion efficiency that the bandwidth was 20nm from 1555nm to 1575nm and the flatness was 0.95dB. The least value of the flatten conversion efficiency is -5.42dB.
We used two FBGs their wavelengths were 1570.398nm and 1570.416nm to construct a backward-pump linear cavity to reduce transmission loss of the architecture efficiently. In the result, we showed out the peak of conversion efficiency was centralized between 1555nm and 1565nm because the dispersion of the laser induced at 1570nm affected the FWM and caused the conversion efficiency uneven.
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