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Título:
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Subwavelength grating Fourier-transform interferometer array in silicon-on-insulator
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Autores:
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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
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Tipo de documento:
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texto impreso
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Editorial:
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Wiley-V C H Verlag Gmbh, 2013-11
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Optica
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Tipo = Artículo
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Resumen:
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A 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 of an array of 32 Mach-Zehnder interferometers, which produce a spatial interferogram without any moving parts, yielding a spectral resolution of 50 pm and a free-spectral range of 0.78 nm. As a result of similar propagation losses in subwavelength grating waveguides and conventional strip waveguides, loss imbalance is minimized and high interferometic extinction ratio of -25 to -30 dB is obtained. Furthermore, phase and amplitude errors arising from normal fabrication variation are compensated by the spectral retrieval process using calibration measurements.
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