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Optics Letters

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  • Vol. 21, Iss. 11 — Jun. 1, 1996
  • pp: 836–838

Spatial mode filters realized with multimode interference couplers

J. Leuthold, R. Hess, J. Eckner, P. A. Besse, and H. Melchior  »View Author Affiliations


Optics Letters, Vol. 21, Issue 11, pp. 836-838 (1996)
http://dx.doi.org/10.1364/OL.21.000836


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Abstract

Spatial mode filters based on multimode interference couplers (MMI’s) that offer the possibility of splitting off antisymmetric from symmetric modes are presented, and realizations of these filters in InGaAsP/InP are demonstrated. Measured suppression of the antisymmetric first-order modes at the output for the symmetric mode is better than 18 dB. Such MMI’s are useful for monolithically integrating mode filters with all-optical devices, which are controlled through an antisymmetric first-order mode. The filtering out of optical control signals is necessary for cascading all-optical devices. Another application is the improvement of on–off ratios in optical switches.

© 1996 Optical Society of America

History
Original Manuscript: September 12, 1995
Published: June 1, 1996

Citation
J. Leuthold, R. Hess, J. Eckner, P. A. Besse, and H. Melchior, "Spatial mode filters realized with multimode interference couplers," Opt. Lett. 21, 836-838 (1996)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-21-11-836


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