Virtually imaged phased array with graded reflectivity

A virtually imaged phased array (VIPA) can produce large angular dispersion, i.e., change in output angle with change in wavelength. The insertion loss and crosstalk of the VIPA demultiplexer are analyzed. It is shown that both characteristics are significantly improved by modifying the reflectivity...

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Veröffentlicht in:	IEEE photonics technology letters 1999-11, Vol.11 (11), p.1443-1445
Hauptverfasser:	Shirasaki, M., Akhter, A.N., Lin, C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Crosstalk Demultiplexers Diffraction gratings Dispersions Joining Optical diffraction Optical fiber dispersion Optical propagation Optical surface waves Optical waveguides Phased arrays Photonics Reflectivity Wavelength division multiplexing Wavelengths
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Beschreibung
Zusammenfassung:	A virtually imaged phased array (VIPA) can produce large angular dispersion, i.e., change in output angle with change in wavelength. The insertion loss and crosstalk of the VIPA demultiplexer are analyzed. It is shown that both characteristics are significantly improved by modifying the reflectivity on the VIPA element. With a graded reflectivity instead of a uniform reflectivity, the mode coupling efficiency to the output fiber is improved from 80%99.5% and the crosstalk Is reduced from -23 to -59 dB.
ISSN:	1041-1135 1941-0174
DOI:	10.1109/68.803073