In this work, we present a numerical study to investigate the transmission, extinction ratio, crosstalk and compression factor outputs of a Mach–Zehnder interferometer in photonic crystal fibers by varying the nonlinearity parameter of the fiber from β = 1 to β = 2 for three different nonlinearity profiles (constant, increasing and decreasing) and in three different scenarios (P0 = Pc, P0 < Pc and P0 > Pc). We observed that the highest transmission (T = 67%), the highest extinction ratio (XR = 3.57 dB) and the lowest crosstalk (Xtalk = -5.25 dB) occurred in the third scenario (P0 = 110 kW > Pc) considering the decreasing profile for β = 1.35. Such condition enables applications such as TDMA and logic circuits.

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The use of Wireless Mesh Networks has growing use in areas without telecommunication infrastructure. One of the main problems is the network performance due to the low capacity of the processors used in intermediary mesh nodes. We propose a hardware implementation of IP Checksum incremental update in FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuits). Then, this implementation is compared with the kernel Linux TCP/IP implementation.Resumo-O uso das Redes Mesh está crescendo emáreas sem infraestrutura de telecomunicação. Um de seus principais problemasé a performance de rede devido aos processadores de baixa capacidade usados em nós intermediários. Neste trabalho, e proposta uma implementação em hardware do Recálculo Incremental do IP Checksum em FPGA (Field Programmable Gate Array) ou ASIC (Application Specific Integrated Circuits). Então, esta implementaçãoé comparada com a implementação em software da pilha TCP/IP do kernel Linux.