Bandwidth optimization of optical add/drop multiplexers using cascaded couplers and Mach-Zehnder sections
- 1 August 1995
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 7 (8) , 902-904
- https://doi.org/10.1109/68.404009
Abstract
A synthesis of channel add/drop filters consisting of cascaded directional couplers and equal Mach-Zehnder sections is presented within this paper yielding a Chebyshev transmission characteristic and therefore, the optimum distribution of the coupling coefficients with respect to sidelobe suppression and filter bandwidth. It is shown that the number of selectable channels N/sub c/ grows approximately linear with the number of filter stages N, resulting in an equal number of channels and filter stages for a 20-dB sidelobe suppression.Keywords
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