An optical communication module comprises a plurality of monolithic semiconductor transmitter photonic integrated circuit chips each having a plurality of optical signal channels approximating wavelengths on a standardized grid. In some embodiments, nonvolatile resistive random access memory device includes a diode, a metal silicon nitride embedded resistor, and a resistive switching layer disposed between a first electrode layer and a second electrode layer. The method also includes determining first and second parameter X0 and Y0 for a target color. of the first elastomeric material is not lower than about 1. If so, the packet is encrypted, and transmitted to the destination network along with an encapsulation header indicating source and destination information: either source and destination host addresses, or the broadcast addresses of the source and destination networks.