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Raman Amplifiers for Use in WDM Systems
D. B. M. Pereira; A. L. J. Teixeira; M. J. N. Lima; P. S. B. André; H. C. C. Fernandes; J. R. Ferreira da RochaIn this paper Raman Amplifiers (RAs) for Wavelength Division Multiplexed (WDM) fiber optic systems are analysed. We start by explaining the physical principles of this kind of amplification are explained, and the principal characteristics and advantages of using these amplifiers are enumerated.The technique of multiple pumping (MP) is studied aiming to obtain broadband amplifiers w...
Wideband Erbium-Doped Fiber Amplifier System Design Limitations due to Cband Si...
D. B. M. Pereira; A. L. J. Teixeira; M. J. N. Lima; P. S. B. André; J. R. Ferreira da RochaIn this paper we observe experimentally the effects of C-band pump light in the performances of an Lband Erbium-Doped Fiber Amplifier (EDFA). An amplifier for C+L-bands in a parallel configuration of two EDFAs is designed, and the inherent implications in its application to optical fiber communications systems. A new configuration is presented for decreasing the signal gain depende...
Thermally Tunable Bragg Grating Filtrers for Wavelength-Multiplexed Systems
M. J. N. Lima; O. Frazão; A. L. J. Teixeira; P. S. B. André; J. R. Ferreira da RochaIn this contribution we compare the thermal tuning capabilities of two type I gratings, considering an unloaded and a hydrogen-loaded fiber, and a type IIa grating. We further study their responses stability with temperature, analyzing their potential as optical filters in wavelength division multiplexing systems. We conclude that all of them have similar tuning efficiencies, howev...
Bragg Gratings with Enhanced Temperature Sustainability Written in a High- Germ...
M. J. N. Lima; R. N. Nogueira; J. C. C. Silva; A. L. J. Teixeira; P. S. B. André; J. R. F. da Rocha; J. H. Kalinowski; J. L. PintoIn this contribution we report the achievement offiber Bragg gratings exhibiting high temperaturesustainability, resultant from type IIA and a new abnormalexposition regimes, and compare their thermal stability withother gratings obtained from different growth mechanisms,namely type I and IA. It is expected that type IIA and thedesignated as abnormal gratings improve the reliability ofhigh-temperature grating-s...
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