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Optical Engineering

Optimization of optical add-drop multiplexers based on grating-assisted null couplers
Author(s): Jose M. Castro; David F. Geraghty
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Paper Abstract

Optical add-drop multiplexers (OADMs) based on grating-assisted null couplers are excellent candidates for low-cost wavelength division multiplexed (WDM) systems. These devices potentially offer exceptional operating characteristics in a compact layout that does not require circulators. Optimization analysis has been already presented. However, inherent fabrication errors either in the null coupler or in the grating increase the crosstalk at the drop port. In this paper, a simple model that relates the optical signal-to-noise ratio (OSNR) of the OADM to the null-coupler and grating parameters is presented. Based on that model, we propose two new approaches to increase the OSNR at the drop at output ports, when fabrication errors are present. One approach optimizes the grating angle to minimize the noise produced by spurious reflection without mode conversion. The other shifts these reflections out of the bandwidth used by the WDM system. The advantages and limitations of these approaches are analyzed.

Paper Details

Date Published: 1 September 2005
PDF: 6 pages
Opt. Eng. 44(9) 095002 doi: 10.1117/1.2042927
Published in: Optical Engineering Volume 44, Issue 9
Show Author Affiliations
Jose M. Castro, The Univ. of Arizona (United States)
David F. Geraghty, The Univ. of Arizona (United States)


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