Telmo Almeida

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The use of long-period gratings (LPGs) to distribute optical power from one core to all the cores in a multicore fiber (MCF) is theoretically analyzed. Simple analytical expressions that describe the mode power's evolution along the LPGs are derived from the coupled mode equations. This study demonstrated the power transfer between cores in a MCF promoted(More)
A configurable optical add-drop multiplexer (OADM) based on fibre Bragg gratings is reported. Dynamically selection of the add-drop or pass-through functionality is realised according to the control of an optical switch. OADM performances measurements in a 70 km, 3 x 2.5 Gb/s channels WDM network are reported.
A configurable optical add-drop multiplexer (OADM) based on fibre Bragg gratings is reported. Dynamically selection of the add-drop or pass-through functionality is realised according to the control of an optical switch. The OADM performance measurement realised in a 70 km, 3 × 2.5 Gb/s channels dense wavelength division multiplexing (DWDM) experimental(More)
We describe the design and performances of a strictly nonblocking optical cross-connect node for WDM wavelength path networks. The optical cross-connect (OXC) prototype was experimentally tested as an 2 x 2 WDM system with two input / output ports with two wavelengths per port. The OXC was inserted in a network with a transmission length of 95 km with a(More)
We propose a technique to inscribe long period gratings (LPGs) in standard single-mode fibers (SSMFs). The proposed method uses a commercial CO<sub>2</sub> splicer that allows for the rotation of the fiber during laser irradiation, enabling a uniform exposure around the fiber. LPGs inscribed in SSMFs with different periods are presented. Gratings can be(More)
The aim of this work was to create digitally phase-shift images avoiding the mechanical adjustments of the PZT, testing them with the digital shearography method. It was tested using a well-known object, a cantilever beam of aluminium under deformation, and a tooth. The results presented the ability to create the deformation map and curves with reliability(More)
In this work we report the development of is a steady state Erbium doped fiber amplifier model in the form of a graphical user interface (GUI), created with Matlab&#x00AE;. The model and the interface were tested by accessing the influence of length, input and pump powers in the gain performance of the amplifier.
We describe the design and performances of a strictly non-blocking optical cross-connect node demonstrator for WDM wavelength path networks. The optical cross-connect (OXC) prototype was experimentally tested as an 2 x 2 WDM system with two input / output ports and two wavelengths per port. The OXC was inserted in a 95 km network with a STM-16 bit stream(More)
In this paper, the optical power transfer promoted by long-period gratings (LPGs) inscribed in Multicore Fibers (MCFs) is studied. Simple analytical expressions that describe the mode power's evolution along the LPGs in a 1+n core fiber are derived from the coupled mode equations. The viability of using this technique to develop a device that distribute a(More)