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A 3-stage structure L-band EDFA is introduced to enhance the poor power conversion efficiency by utilizing the wasted ASE from the third EDF section and pump bypass in 1-2 stage. The results indicate that the EDFA could provide low-noise, high-gain and large-flatness ranging from 1570 to 1610 nm.
An improved simulation model of switchable dual-wavelength laser has been proposed, with which the different stabilization behaviors with dual-wavelength lasers based on inhomogeneous and homogeneous active media has been analyzed. The numerical results can well explain these actual switching behaviors of a dual-wavelength fiber switchable laser.
In the present paper, a new electromagnetic bandgap (EBG) structure is proposed to design and fabricate low-pass filters on coplanar waveguide (CPW). Using the novel EBG structure, the filter prototypes exhibit sharp cutoff and low insertion loss in the passband. An equivalent lumped L-C circuit mode is introduced to describe the proposed EBG structure, which manifests an elliptic-function low-pass...
An InGaAsP/InP waveguide variable optical attenuator (VOA) is proposed in this paper. The device consists of straight input and output waveguides and an S-bend waveguide. An electrode is deposited on a portion of the waveguide to form an active region so that its refractive index can be modified by a current injection, resulting in the variation of the transmitted optical power. The beam propagation...
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