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    • 6. 发明授权
    • Optical communications
    • 光通信
    • US08213806B2
    • 2012-07-03
    • US12480573
    • 2009-06-08
    • Robert Griffin
    • Robert Griffin
    • H04B10/04
    • H04B10/5561H04L25/03343
    • A method of transmitting a plurality n data streams comprises modulating an optical carrier using differential M-ary phase shift key (DMPSK) signalling in which M=2n. Advantageously the method comprises using differential quaternary phase shift keying in which n=2. A particular advantage of the method of the present invention is that since the data is differentially encoded in the form of phase changes rather than absolute phase values this enables the modulated optical carrier to be demodulated using direct detection without requiring a phase-locked local optical oscillator. The invention is particularly applicable to WDM communication systems.
    • 发送多个n个数据流的方法包括:使用M = 2n的差分M相移键(DMPSK)信令调制光载波。 有利地,该方法包括使用n = 2的差分四相移键控。 本发明方法的一个特别优点在于,由于数据以相位变化形式进行差分编码,而不是绝对相位值,这使得可以使用直接检测来调制调制的光载波,而不需要锁相局部光学振荡器 。 本发明特别适用于WDM通信系统。
    • 7. 发明授权
    • Demodulation of an optical carrier
    • 光载波的解调
    • US08200099B2
    • 2012-06-12
    • US12897172
    • 2010-10-04
    • Robert Griffin
    • Robert Griffin
    • H04B10/04
    • H04B10/5561H04L25/03343
    • A method of transmitting a plurality n data streams comprises modulating an optical carrier using differential M-ary phase shift key (DMPSK) signaling in which M=2n. Advantageously the method comprises using differential quaternary phase shift keying in which n=2. A particular advantage of the method of the present invention is that since the data is differentially encoded in the form of phase changes rather than absolute phase values this enables the modulated optical carrier to be demodulated using direct detection without requiring a phase-locked local optical oscillator. The invention is particularly applicable to WDM communication systems.
    • 发送多个n个数据流的方法包括:使用M = 2n的差分M相移键(DMPSK)信令调制光载波。 有利地,该方法包括使用n = 2的差分四相移键控。 本发明方法的一个特别优点在于,由于数据以相位变化形式进行差分编码,而不是绝对相位值,这使得可以使用直接检测来调制调制的光载波,而不需要锁相局部光学振荡器 。 本发明特别适用于WDM通信系统。