Wavelength-locking of optical sources
    1.
    发明授权
    Wavelength-locking of optical sources 有权
    光源的波长锁定

    公开(公告)号:US06493131B1

    公开(公告)日:2002-12-10

    申请号:US09746370

    申请日:2000-12-20

    IPC分类号: G02F202

    摘要: A device is used to wavelength lock two optical signals to some frequency offset. A photomixer section produces a frequency test signal from the beat component of the two optical signals. The frequency of the frequency test signal reflects whether the actual frequency offset of the two optical signals equals the desired offset. A frequency filter with a monotonically varying transfer function is used to filter the frequency test signal. Thus, different gains are applied to different frequencies. Comparison circuitry uses the filtered signal to determine whether the frequency filter applied the gain which corresponds to the desired frequency offset and generates a corresponding error signal.

    摘要翻译: 一个设备用于将两个光信号锁定到一些频偏。 光混合器部分产生来自两个光信号的拍子分量的频率测试信号。 频率测试信号的频率反映两个光信号的实际频率偏移是否等于期望的偏移。 使用具有单调变化传递函数的频率滤波器对频率测试信号进行滤波。 因此,不同的增益被应用于不同的频率。 比较电路使用经滤波的信号来确定频率滤波器是否施加与期望频率偏移相对应的增益,并产生相应的误差信号。

    Optical communications using multiplexed single sideband transmission and heterodyne detection
    4.
    发明申请
    Optical communications using multiplexed single sideband transmission and heterodyne detection 有权
    使用复用单边带传输和外差检测的光通信

    公开(公告)号:US20070133993A1

    公开(公告)日:2007-06-14

    申请号:US11514381

    申请日:2006-08-31

    IPC分类号: H04J14/02

    CPC分类号: H04B10/50 H04B10/61 H04B10/64

    摘要: A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarizations. For example, in one approach, two or more optical transmitters generate optical signals which have different polarizations. An optical combiner optically combines the optical signals into a composite optical signal for transmission across an optical fiber. In another approach, a single optical transmitter generates an optical signal with multiple subbands. The polarization of the subbands is varied, for example by using a birefringent crystal. In another aspect of the invention, each optical transmitter generates an optical signal containing both a lower optical sideband and an upper optical sideband (i.e., a double sideband optical signal). An optical filter selects the upper optical sideband of one optical signal and the lower optical sideband of another optical signal to produce a composite optical signal.

    摘要翻译: 发射机子系统产生包含多个信息子带的光信号。 子带具有不同的极化。 例如,在一种方法中,两个或更多个光发射机产生具有不同偏振的光信号。 光学组合器将光学信号光学地组合成用于跨光纤传输的复合光信号。 在另一种方法中,单个光发射机产生具有多个子带的光信号。 例如通过使用双折射晶体来改变子带的极化。 在本发明的另一方面,每个光发射机产生包含下光边带和上光边带(即,双边带光信号)的光信号。 光滤波器选择一个光信号的上光边带和另一光信号的下光边带产生复合光信号。