Title :
Bandwidth optimization of optical add/drop multiplexers using cascaded couplers and Mach-Zehnder sections
Author :
Kostrzewa, C. ; Petermann, K.
Author_Institution :
Inst. fur Hochfrequenztech., Tech. Univ. Berlin, Germany
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 :
cascade systems; multiplexing equipment; optical communication equipment; optical directional couplers; optical fibre communication; optical fibre couplers; optical fibre filters; wavelength division multiplexing; Chebyshev transmission characteristics; Mach-Zehnder sections; bandwidth optimization; cascaded couplers; cascaded directional couplers; channel add/drop filters; filter stages; optical add/drop multiplexers; optimum distribution; selectable channels; sidelobe suppression; Add-drop multiplexers; Bandwidth; Couplings; Directional couplers; Equations; Finite impulse response filter; Optical add-drop multiplexers; Optical filters; Optical waveguides; Transmission line matrix methods;
Journal_Title :
Photonics Technology Letters, IEEE
