| Keywords |
Optical Duobinary Transmitter ; Mach-Zehnder Modulator(MZM) ; LPF(Low Pass Filter) ; Driving Voltage Ratio ; Splitting/Combining Ratio ; Asymmetry Ratio ; Eye Diagram ; Bit Error Rate(BER) |
| Abstract |
This paper presents the performance analysis of 10[Gb/s] optical duobinary transmitters with the non-ideal Mach-Zehnder modulator which does not have exactly 50/50 splitting/combining ratios by computer-simulations. For driving voltage ratios(=driving voltage/switching voltage) with smaller than 100[%], the transmission performance has been greatly affected by extension of LPF bandwidths. Nevenheless, the performance has been degraded when the driving voltage ratio is 100[%]. The smaller driving voltage ratios has, the more sensitivity improves by extension of LPF bandwidths under the asymmetry condition. But the driving voltage ratio with 80[%] has better bit error rate(BER) than those with 50[%] and 25[%]. |