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    • 6. 发明授权
    • Measuring optical phase
    • 测量光学相位
    • US06765681B1
    • 2004-07-20
    • US10119501
    • 2002-04-10
    • John N. SweetserAnders Grunnet-Jepsen
    • John N. SweetserAnders Grunnet-Jepsen
    • G01B902
    • G01M11/0264G01M11/0271
    • The phase (and amplitude) of a wave front may be accurately measured using knowledge of the wave front of an optical field generated by an optical element, permitting the determination of the spatial transfer function of that optical element. As a device under test is scanned across an aperture plate having slits, variations in the relative amplitude and phase of light passing through the slits are affected by the optical properties of the device under test, in turn affecting the interference pattern at a detector. Changes in the amplitude and phase of the detected signal are directly and uniquely related to the transfer function of the device under test.
    • 可以使用光学元件产生的光场的波前的知识来精确地测量波前的相位(和幅度),从而允许确定该光学元件的空间传递函数。 由于被测设备被扫描穿过具有狭缝的光阑,因此通过狭缝的光的相对幅度和相位的变化受被测设备的光学特性的影响,进而影响检测器处的​​干涉图案。 检测到的信号的幅度和相位的变化与被测器件的传递函数直接且唯一相关。
    • 9. 发明授权
    • Time-wavelength multiple access optical communication systems and methods
    • 时间波长多址光通信系统及方法
    • US06292282B1
    • 2001-09-18
    • US09354851
    • 1999-07-16
    • Thomas MossbergAnders Grunnet-JepsenJohn N. SweetserMichael Munroe
    • Thomas MossbergAnders Grunnet-JepsenJohn N. SweetserMichael Munroe
    • H04J400
    • H04B10/85G02B6/2861H04J14/005
    • Methods and apparatus for optical communication are disclosed. An optical data stream is encoded to produce an optical data stream having a predetermined time-wavelength spectrum. Two or more encoded data streams are combined in a transmission medium (e.g., optical fiber) and the combined data stream is decoded with decoders corresponding to the encoding of the data streams, producing decoded outputs. The decoded outputs include a portion corresponding to a selected data stream as well as a portion corresponding to unselected data streams (crosstalk). A nonlinear detector receives the decoded outputs and rejects crosstalk. Coders produce temporal delays and phase shifts specified by a time-wavelength code for, the spectral components of an input optical signal. Some coders convert optical signals encoded with a first time-wavelength code into an output corresponding to a second time-wavelength code. Temporal delays and phase shifts can be selected to compensate for dispersion in a transmission medium. Coherent coders are provided in which the phase shifts produced on the spectral components of an optical signal are controlled within about one half of the wavelength of the spectral component.
    • 公开了用于光通信的方法和装置。 光学数据流被编码以产生具有预定时间波长频谱的光学数据流。 在传输介质(例如光纤)中组合两个或多个编码数据流,并且使用与数据流的编码相对应的解码器解码组合数据流,从而产生解码的输出。 解码的输出包括对应于所选数据流的部分以及对应于未选择的数据流(串扰)的部分。 非线性检测器接收解码输出并拒绝串扰。 编码器由输入光信号的频谱分量产生由时间波长码指定的时间延迟和相移。 一些编码器将用第一时间波长码编码的光信号转换成对应于第二时间波长码的输出。 可以选择时间延迟和相移来补偿传输介质中的色散。 提供了相干编码器,其中在光信号的光谱分量上产生的相移被控制在光谱分量的波长的大约一半的范围内。