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Proceedings Paper

Fiber-to-rectangular waveguide optical coupling by means of diffractive elements
Author(s): M. Prasciolu; Dan Cojoc; Stefano Cabrini; Luca Businaro; C. Liberale; Vittorio Degiorgio; Enzo M. Di Fabrizio
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Paper Abstract

The present research work is devoted to the realization of an efficient fiber-waveguide optical coupling between single-mode fiber and rectangular waveguide. The outcomimg laser beam exiting from the fiber has a gaussian transversal field distribution. On the contrary, the single-mode waveguide has an asymmetric transversal field distribution in X and Y-axis. To transform the outcoming circular laser beam onto a rectangular, size adjusted, spot we have used a multilevel diffractive phase element fabricated directly on the top of the fiber by means of nanolitography. The diffractive phase element is calculated to focus and reshape the gaussian symmetric beam exiting a single-mode fiber into a desired asymmetric intensity distribution at the waveguide input plane. Phase modulation is obtained by multilevel profiling a polymeric material coated on the top of the fiber by means of a specific fabrications process including e-beam lithography and chemical etching. Experimental results obtained for fiber-waveguide coupling with a 20 microns diameter diffractive element are also presented.

Paper Details

Date Published: 30 September 2003
PDF: 7 pages
Proc. SPIE 5227, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, (30 September 2003); doi: 10.1117/12.519803
Show Author Affiliations
M. Prasciolu, Elettra Synchrotron Light Source (Italy)
Dan Cojoc, Elettra Synchrotron Light Source (Italy)
Univ. Politehnica of Bucharest (Romania)
Stefano Cabrini, Elettra Synchrotron Light Source (Italy)
Luca Businaro, Elettra Synchrotron Light Source (Italy)
C. Liberale, Univ. degli Studi di Pavia (Italy)
Vittorio Degiorgio, Univ. degli Studi di Pavia (Italy)
Enzo M. Di Fabrizio, Elettra Synchrotron Light Source (Italy)


Published in SPIE Proceedings Vol. 5227:
Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies

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