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In this paper, a novel theoretical model of an Erbium Doped Fiber Amplifier (EDFA) configured in Quadruple Pass Dual Stage (QPDS) amplification which is incorporated with Tunable band pass filters (TBFs) is proposed. Amplified Spontaneous Emission (ASE) is filtered-out in mid-section to ensure efficient amplification of the signal as it propagates along the fiber. The two stages were pumped by laser...
Modern WDM telecommunication systems require stable and calibrated laser sources. In this paper we present examples of such lasers based on erbium-doped fibres: discretely tunable and multiwavelength ring lasers. For the first case tuning is possible due to tunable Bragg grating overlapping spectrally the third telecommunication window (1550 nm). When a Fabry-Perot etalon is inserted into the cavity,...
We report a tunable laser source emitting in the visible (530 nm, 630 nm) and the near infrared (775 nm, 1060 nm, and 1550 nm) regions by frequency summation of a dual wavelength Er/Yb co-doped fiber laser.
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