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The relationship between cascaded Mach-Zehnder interferometers (MZIs) of different forms is studied. A flat-top interleaver based on cascaded MZIs with optical delay lines of equal length and same sign is optimally designed. An optimization method which combines the genetic algorithm and a gradient method is used to find appropriate net coupling for the directional couplers. The chromatic dispersion...
The optimal design of an NxN coupler of multimode interference (MMI) type is considered. The geometrical structure of the whole NxN coupler can be determined effectively by three parameters when the width of the MMI section is given. A genetic algorithm is used to determine these three parameters to achieve good results for the uniformity and excess loss. The optimal design is verified by a numerical...
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