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A Mach-Zehnder inference assembly, which comprises an input port, an output port, an input coupler, an output coupler, first and second light guides extending between the couplers, the input coupler being used to guide the inputted light to the first and second light guides, the output coupler being used to combine the first and second light guides and guide the combined light to the output port, the guides separately having a light guide length of l1 and l2 between the couplers, the assembly having a transfer function related to supplying a partial light through the first output port and appearing on the output port, the function being non-periodic, the transfer function comprising a substantially wide major passband or trapwave.