发明名称 |
Phase modulation for an optical transmission system |
摘要 |
A data modulation apparatus is proposed that includes a data modulator (20) for modulating data onto an optical signal at a predetermined bit rate. The resulting encoded optical signal is phase modulated by a phase modulator (50) that is driven by at least one waveform of a frequency that is 1/n of the predetermined bit rate, where n is an integer greater than 2. The application of a phase modulation at a frequency of a third or less of the bit rate of a digital data signal increases the non-linear tolerance of a transmission system by reducing the effect of non-linear pulse-to-pulse interactions. Moreover, this increase in non-linear tolerance is significantly better than that obtained by a phase modulation at one half of the data bit rate, while the implementation of a phase modulator at this lower frequency reduces the complexity of the transmitter.
|
申请公布号 |
US2003219259(A1) |
申请公布日期 |
2003.11.27 |
申请号 |
US20030401140 |
申请日期 |
2003.03.28 |
申请人 |
MARTENSSON JONAS;BERNTSON ANDERS;FORZATI MARCO |
发明人 |
MARTENSSON JONAS;BERNTSON ANDERS;FORZATI MARCO |
分类号 |
H04B10/155;(IPC1-7):H04B10/04 |
主分类号 |
H04B10/155 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|