Two Channel 560 Mbit/s DPSK Transmission Experiments with Two Cascaded In-Line Broadband Optical Amplifiers

Prediction of the gain versus injection-current characteristic of individual semiconductor laser amplifiers

“…We conclude we have chosen the correct parameters to represent the differences in characteristics both between structurally different devices and individual devices of identical structure. Finally, we calculate the gain versus current characteristic based on this model and find good agreement with the measured data provided by Enning et al [9] for a specific laser amplifier.…”

“…Both amplifiers reach a single-pass gain of Gps = ( 1 /Ro) = 2.8 at their respective Zto, i.e., with an offset of 3.9 mA. Apart from this offset, the measured data for the device of [9] and the calculated gain versus current characteristic for the 6M3772 device agree well over a wide range of currents.…”

“…10 correspond to graph (iii) in Fig. 9(a) and (b), respectively) indicates that the assumption of gain = loss at the nominal threshold current Zf2 Table 11, the circles indicate the measured values of ( Gps, I ) obtained in [9] for the device 5F3432.…”

“…9(b)) is compared to measured values (dots in Fig. 9(b)) obtained by Enning et al [9] for a traveling wave amplifier made from the same type of laser (device 5F3432 of Table 11). The threshold currents of the two uncoated devices are Zro = 28.6 and 32.5 mA [22], respectively.…”