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    Optical digital-to-analog conversion
    1.
    发明公开
    Optical digital-to-analog conversion 有权
    Optische数字模拟万向

    公开(公告)号：EP1562070A1

    公开(公告)日：2005-08-10

    申请号：EP04255948.4

    申请日：2004-09-29

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Chen, Young-Kai ,  Leven, Andreas ,  Tu, Kun-Yi

    IPC: G02F7/00

    CPC classification number: G02F7/00 ,  G02F2201/18

    Abstract: An optical digital-to-analog conversion is realized by employing either a continuous wave or pulsed laser optical signal. The laser optical signal is split into a plurality of mutually coherent optical beams, which are phase shift modulated by bits of a digital data sequence to be converted to an analog signal. The phase shift modulated optical beams are recombined coherently to realize the desired digital-to-analog converted optical signal.

    Abstract translation: 通过采用连续波或脉冲激光光信号实现光数字到模拟转换。 激光光信号被分割成多个相互相干的光束，它们被数字数据序列的位进行相移调制以转换成模拟信号。 相移调制光束被相干重新组合以实现期望的数模转换光信号。

    Direct optical N-state phase shift keying
    2.
    发明公开
    Direct optical N-state phase shift keying 有权
    Direkte optische N-Status-Phasenumtastung

    公开(公告)号：EP1962444A1

    公开(公告)日：2008-08-27

    申请号：EP04250126.2

    申请日：2004-01-13

    Applicant: Lucent Technologies Inc.

    Inventor： Leven, Andreas

    IPC: H04B10/155 ,  H04L27/20

    CPC classification number: H04B10/5055 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/5053 ,  H04B10/5561 ,  H04L27/2096

    Abstract: A unique optical encoder is employed that utilizes an optical phase modulator, in which an arbitrary phase shift can be realized. The phase modulator is driven by an electrical signal, where the voltage amplitude is proportional to a desired arbitrary phase shift. However, any amplitude noise or poor rise and fall times of the driving voltage translates directly into phase errors. These problems are eliminated by employing a digital phase switch. One encoder, in accordance with the invention, employs an optical phase modulator that can switch the optical phase in a binary manner, wherein the two phase states of the modulator can be chosen to differ by any desired arbitrary angle depending on the splitting ratio of the optical signal to be modulated.

    Abstract translation: 采用独特的光学编码器，其使用光相位调制器，其中可以实现任意的相移。 相位调制器由电信号驱动，其中电压幅度与期望的任意相移成比例。 然而，驱动电压的任何幅度噪声或差的上升和下降时间直接转换为相位误差。 通过采用数字相位开关来消除这些问题。 根据本发明的一个编码器采用可以以二进制方式切换光学相位的光相位调制器，其中调制器的两个相位状态可以被选择为根据任何所需的任意角度而不同，这取决于 要调制的光信号。

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