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    • 10. 发明授权
    • Optical modulator and method of encoding communications traffic in a multilevel modulation format
    • 光调制器和以多级调制格式编码通信业务的方法
    • US09525491B2
    • 2016-12-20
    • US14352681
    • 2011-10-19
    • Fabio Cavaliere
    • Fabio Cavaliere
    • H04B10/556H04B10/00H04B10/06H04B10/50
    • H04B10/5561H04B10/5053
    • An optical modulator is described, comprising—an optical splitter to receive an optical carrier signal and split it into sub-signals; modulation assemblies, each comprising a binary optical modulator to apply a binary phase shift keyed (BPSK) modulation to a respective optical sub-signal to form a BPSK modulated optical sub-signal. Modulation assemblies comprise a phase-shifter, each to apply a phase shift to the respective BPSK modulated optical sub-signal in dependence on a pre-selected modulation format; an encoding apparatus to receive communications traffic to map into symbols, and to generate and transmit a respective drive signal to the optical modulator of a modulation assembly, each drive signal to cause the optical modulator to apply said BPSK modulation, to encode the symbols onto the respective optical carrier sub-signal; and a combiner to receive each BPSK modulated optical sub-signal to form an output optical signal having said multilevel modulation format.
    • 描述了一种光调制器,包括 - 光分路器,用于接收光载波信号并将其分割成子信号; 调制组件,每个包括二进制光调制器,以将二进制相移键控(BPSK)调制应用于相应的光子信号以形成BPSK调制的光子信号。 调制组件包括移相器,每个移相器根据预先选择的调制格式向相应的BPSK调制的光子信号施加相移; 编码装置,用于接收要映射成符号的通信业务,并且生成并将相应的驱动信号发送到调制组件的光调制器,每个驱动信号使光调制器应用所述BPSK调制,将符号编码到 相应的光载波子信号; 以及组合器,用于接收每个BPSK调制的光子信号,以形成具有所述多电平调制格式的输出光信号。