The present invention provides an assembly for use in connecting optical fibers. According to the invention, pelargonidin glycoside was added to the composition of the natural colorant that contained cyanidin glycosides, peonidin glycosides, organic substance and mineral salts. In general, the input voltage swing may be reduced by coupling an attenuator to each input of the charge pump circuit. During operation of the circuit in the time-to-count mode then, the converter may be operated for this number of clock cycles using the input signal to determine an output.