A multi-wavelength Brillouin/Erbium-Ytterbium doped fiber laser which operates in the 1535 nm region is proposed and demonstrated. The system employs both linear and nonlinear gain from a 4 meter Erbium-Ytterbium doped fiber and an 8 km single mode fiber respectively to generate an optical comb with a spacing of approximately 0.084 nm. A stable output laser comb of more than 22 lines was obtained with a Brillouin pump of 2 dBm and a 1058 nm pump of 175 mW. A maximum peak power of -4.2 dBm was obtained at a wavelength of 1535.16 nm at these pump power settings while the spectral linewidth of the laser is approximately 8 Hz.
Gain and noise figure enhancements in an Er/Yb doped fiber amplifier (EYDFA) are demonstrated using a dual-stage amplifier configuration. In comparison to a conventional single-stage amplifier, the gain in this amplifier is enhanced at all wavelengths between 1530 to 1560 nm for the input signal powers of −40 and 0 dBm. A maximum gain improvement of 7.3 dB is obtained at a small signal (−40 dBm) wavelength of 1534 nm. The noise figure of the design is also enhanced at all wavelengths between 1530 to 1560 nm with a maximum reduction of 3.0 dB obtained at the small signal wavelength (−40 dBm) of 1542 nm. The total pump power used in this design is fixed at 140 mW. This improvement of gain and noise characteristics is attributed to the efficient pump power distribution within the amplifier and also the addition of a midway optical isolator between the two amplifier stages. The isolator blocks the backward propagating ASE to increase the population inversion at the first stage and thus, enhances the amplifier gain and noise figure. These results show that the usage of a dual-stage configuration with a midway optical isolator is an invaluable consideration when constructing a practical EYDFA. Keywords: EYDFA, Er/Yb, optical amplifier Classification: Photonics devices, circuits, and systems
References[1] E. Delevaque, T. Georges, M. Monerie, P. Lamouler, and J. F. Bayon, "Modeling of pair-induced quenching in erbium-doped silicate fibers,"
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