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    • 1. 发明授权
    • Apparatus for spectral encoding and decoding of femtosecond optical
pulses
    • 用于飞秒光脉冲频谱编码和解码的装置
    • US5907421A
    • 1999-05-25
    • US619090
    • 1996-03-20
    • Warren S. WarrenJune-Koo RheeHisashi Kobayashi
    • Warren S. WarrenJune-Koo RheeHisashi Kobayashi
    • H04B10/14H04B10/04
    • H04B10/676
    • A DPSK communication system employs an optical signal which comprises plural, coherent, optical frequencies, each optical frequency positioned within a range of frequencies (i.e., a "frequency slot"). The optical signal comprises plural frequency slots, with the wavefront in each time segment of each frequency slot being phase modulated in accordance with data signals. Plural frequency slots are transmitted "in parallel", in each of a plurality of succeeding time segments. A demodulator includes first and second optical paths, the first component of the optical signal directed onto the first optical path and a second component directed onto the second optical path. A modulator is positioned in at least one of the optical paths and is responsive, during a time segment, to a first applied control signal, to alter the phase, and thus the frequency, of the first component by approximately one frequency slot. At the output of the first and second optical paths, an optical coupler interferes the first component and the second component so as to enable constructive and destructive interference therebetween in accordance with respective phase modulations thereof.
    • DPSK通信系统采用包括多个相干光频率的光信号,每个光频率位于频率范围内(即,“频率槽”)。 光信号包括多个频率时隙,每个时隙的每个时间段中的波阵面根据数据信号进行相位调制。 在多个后续时间段中的每一个中,“并行地”发送多个时隙。 解调器包括第一和第二光路,光信号的第一分量被引导到第一光路上,第二分量指向第二光路。 调制器位于至少一个光路中,并且在时间段期间响应于第一施加的控制信号,以将第一分量的相位以及因此的频率改变大约一个频率槽。 在第一和第二光路的输出处,光耦合器干扰第一部件和第二部件,以便根据其相应的相位调制来实现它们之间的建构性和相消干涉。