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Power-efficient layout of a fiber-optic multistar that permits log 2 N concurrent baseband transmissions among N stations

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1 Author(s)
Birk, Y. ; Dept. of Electr. Eng., Technion, Haifa, Israel

A passive, single-hop, fiber-optic interconnection among N stations, each with two transmitters and one receiver, and a round-robin transmission schedule for it, which jointly permit log 2 N concurrent noninterfering transmissions on a single wavelength, has recently been described. This is a substantial improvement over the previously known limit of two concurrent transmissions, but the layout of this interconnection poses a challenge in terms of both wiring complexity and path loss. A power-efficient implementation of this interconnection using several stages of balanced fiber-optic star couplers is presented here. With lossless components, path loss is N, the same as that of a single-star interconnection that permits only a single transmission at a time. Consequently, the high degree of parallelism translates into higher capacity. The required number of (2×2) star couplers is also very similar to that required for implementing a single N×X star

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Lightwave Technology, Journal of  (Volume:11 ,  Issue: 5 )