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Martínez Matos, Óscar ; Cheben, Pavel ; Schmid, Jens H. ; Bogdanov, Alexei L. ; Calvo Padilla, María Luisa ; Delâge, André ; Densmore, Adam ; Janz, Siegfried ; Lamontagne, Boris ; Lapointe, Jean ; Post, Edith ; Powell, Ian ; Rodrigo Martín-Romo, José Augusto ; Waldron, Phillip ; Xu, Dan-Xia | IEEE | 2006We present several new concepts to extend the capabilities of arrayed waveguide grating spectrometers. Strong lateral mode confinement wavegaide structure in the focal plane is used to increase resolution, a Michelson-type AWG spectrometer can i[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Janz, Siegfried ; Rodrigo Martín-Romo, José Augusto ; Xu, Dan-Xia ; Delâge, André | IEEE - Inst. Electrical Electronics Engineers Inc. | 2006-03The authors propose a new wavelength-dispersive principle based on waveguide group-index modification and apply this principle in a new type of arrayed waveguide dispersive element based on modified group index. The element is composed by an arr[...]texto impreso
Villafranca Velasco, Aitor ; Bock, Przemek J. ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Schmid, Jens H. ; Lapointe, Jean ; Xu, Dan-Xia ; Janz, Siegfried ; Delâge, André | The Institution of Engineering and Technology (IET) | 2012-06-07The fabrication and experimental characterisation of a two-stage bandpass filter based on curved waveguide sidewall gratings is reported for the silicon-on-insulator platform. At each cascaded filtering stage, the spectral components of the inpu[...]texto impreso
Bock, Przemek J. ; Cheben, Pavel ; Schmid, Jens H. ; Villafranca Velasco, Aitor ; Delâge, André ; Janz, Siegfried ; Xu, Dan-Xia ; Lapointe, Jean ; Hall, Trevor J. ; Calvo Padilla, María Luisa | The Optical Society Of America | 2012-08-27We experimentally demonstrate a new type of waveguide multiplexer device designed for silicon photonics, with a crosstalk level as low as -35 dB and an operational wavelength range of 300 nm. A compact device footprint of only 100 x 160 µm2 offe[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Cheben, Pavel ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa ; Scott, Alan ; Solheim, Brian ; Xu, Dan-Xia ; Delâge, André | The Optical Society Of America | 2007-12-10We present an analysis of Fourier-transform arrayed waveguide gratings in the Fresnel diffraction regime. We report a distinct spatial modulation of the interference pattern referred to as the Moire-Talbot effect. The effect and its influence in[...]texto impreso
Florja?czyk, Miroslaw ; Villafranca Velasco, Aitor ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Bock, Przemek J. ; Delâge, André ; Schmid, Jens H. ; Lapointe, Jean ; Janz, Siegfried ; Xu, Dan-Xia ; Vachon, Martin | IEEE-Inst Electrical Electronics Engineers Inc. | 2013We report a spatial heterodyne Fourier-transform spectrometer consisting of an array of Mach-Zehnder interferometers (MZI) implemented in silicon microphotonics. Optical path differences between the MZI arms increase linearly along the array, ge[...]texto impreso
Villafranca Velasco, Aitor ; Cheben, Pavel ; Bock, Przemek J. ; Schmid, Jens H. ; Delâge, André ; Lapointe, Jean ; Janz, Siegfried ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Florja?czyk, Miros?aw ; Vachon, Martin | The Optical Society Of America | 2013-03-01We report a stationary Fourier-transform spectrometer chip implemented in silicon microphotonic waveguides. The device comprises an array of 32 Mach-Zehnder interferometers (MZIs) with linearly increasing optical path delays between the MZI arms[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Rodrigo Martín-Romo, José Augusto ; Janz, Siegfried ; Xu, Dan-Xia ; Delâge, André | Elsevier Science BV | 2007-02-01We propose a new type of arrayed waveguide grating (AWG) multiplexer/demultiplexer based on modified group refractive index. This device is composed by an array of straight and parallel waveguides of equal length and each waveguide consist of tw[...]texto impreso
Villafranca Velasco, Aitor ; Cheben, Pavel ; Florja?czyk, Miros?aw ; Schmid, Jens H. ; Bock, Przemek J. ; Lapointe, Jean ; Delâge, André ; Janz, Siegfried ; Vachon, Martin ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Civiš, Svatopluk | Optical Society of America | 2013-07-01We report a spatial heterodyne Fourier-transform spectrometer implemented with an array of optical fiber interferometers. This configuration generates a wavelength-dependent stationary interferogram from which the input spectrum is retrieved in [...]texto impreso
Herrero-Bermello, Alaine ; Villafranca Velasco, Aitor ; Podmore, Hugh ; Cheven, Pavel ; Schmid, Jens H. ; Janz, Siegfried ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Scott, Alan ; Lee, Regina | SPIE - International Society for Optical Engineering | 2018Spatial heterodyne Fourier transform (SHFT) spectroscopy is based on simultaneous interferometric measurements implementing linearly increasing optical path differences, hence circumventing the need for mechanical components of traditional Fouri[...]texto impreso
Bock, Przemek J. ; Cheben, Pavel ; Villafranca Velasco, Aitor ; Schmid, Jens H. ; Delâge, André ; Florja?czyk, Miros?aw ; Lapointe, Jean ; Xu, Dan-Xia ; Vachon, Martin ; Janz, Siegfried ; Calvo Padilla, María Luisa | Wiley-V C H Verlag Gmbh | 2013-11A planar waveguide Fourier-transform spectrometer with densely arrayed Mach-Zehnder interferometers is demonstrated. Subwavelength gratings are used to produce an optical path difference without waveguide bends. The fabricated device comprises o[...]texto impreso
Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Ortega Moñux, Alejandro ; Schmid, Jens H. ; Alonso Ramos, Carlos ; Molina Fernández, Íñigo ; Lapointe, Jean ; Vachon, Martin ; Janz, Siegfried ; Xu, Dan-Xia | IEEE | 2012We demonstrate an ultracompact polarization mode converter based on a silicon-on-insulator waveguide with two longitudinal subwavelength trenches. An extinction ratio of 16 dB at 1.5 ?m is achieved for a device length of 10 ?m.texto impreso
Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Ortega Moñux, Alejandro ; Alonso Ramos, Carlos Alberto ; Molina Fernández, Íñigo ; Lapointe, Jean ; Vachon, Martin ; Janz, Siegfried ; Xu, Dan-Xia | The Optical Society Of America | 2012-02-01The design and fabrication of an ultracompact silicon-on-insulator polarization converter is reported. The polarization conversion with an extinction ratio of 16 dB is achieved for a conversion length of only 10 mu m. Polarization rotation is ac[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Delâge, André ; Janz, Siegfried ; Xu, Dan-Xia | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2004We propose a modified arrayed waveguide grating (AWG) demultiplexer formed by an array of parallel ridge waveguides of equal length fabricated in silicon-on-insulator (SOI). Each waveguide contains two sections with different widths. The lenghts[...]
