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    • 7. 发明授权
    • HDMI TMDS optical signal transmission using PAM technique
    • 使用PAM技术的HDMI TMDS光信号传输
    • US08340529B2
    • 2012-12-25
    • US12813562
    • 2010-06-11
    • Kalpendu ShastriBipin DamaVipulkumar PatelMark Webster
    • Kalpendu ShastriBipin DamaVipulkumar PatelMark Webster
    • H04B10/12
    • H04N7/22G09G5/006G09G2370/12G09G2370/18
    • An HDMI interconnect arrangement is presented that performs a pulse-amplitude modulation (PAM) conversion of the TMDS audio/video signals in order to simultaneously transmit all three channels over a single optical fiber. The set of three audio/video TMDS channels is applied as an input to a PAM-8 optical modulator, which functions to encode the set of three channels onto an optically-modulated output signal. The modulated optical signal is thereafter coupled into an optical fiber within an active HDMI cable and transmitted to an HDMI receiver (sink). The TMDS CLK signal is not included in this conversion into the optical domain, but remains as a separate electrical signal to be transmitted along a copper signal path within the active HDMI cable.
    • 呈现HDMI互连布置,其执行TMDS音频/视频信号的脉冲幅度调制(PAM)转换,以便通过单根光纤同时传输所有三个通道。 三组音频/视频TMDS通道的组合被用作PAM-8光调制器的输入,PAM-8光调制器用于将三个通道的组合编码到光调制的输出信号上。 调制的光信号此后耦合到有源HDMI电缆中的光纤中,并被传输到HDMI接收器(接收器)。 TMDS CLK信号不包含在该转换到光学域中,而是作为单独的电信号保持在有源HDMI电缆内的铜信号路径上传输。
    • 10. 发明授权
    • Silicon-based optical modulator with improved efficiency and chirp control
    • 硅基光学调制器,提高效率和啁啾控制
    • US08520984B2
    • 2013-08-27
    • US12781471
    • 2010-05-17
    • Mark WebsterRussell RomanoKalpendu Shastri
    • Mark WebsterRussell RomanoKalpendu Shastri
    • G02F1/035
    • G02F1/2257G02F2203/20G02F2203/25
    • A silicon-based optical modulator exhibiting improved modulation efficiency and control of “chirp” (i.e., time-varying optical phase) is provided by separately biasing a selected, first region of the modulating device (e.g., the polysilicon region, defined as the common node). In particular, the common node is biased to shift the voltage swing of the silicon-based optical modulator into its accumulation region, which exhibits a larger change in phase as a function of applied voltage (larger OMA) and improved extinction ratio. The response in the accumulation region is also relatively linear, allowing for the chirp to be more easily controlled. The electrical modulation input signal (and its inverse) are applied as separate inputs to the second region (e.g., the SOI region) of each arm of the modulator.
    • 通过分别偏置调制装置的选定的第一区域(例如,定义为共同的多晶硅区域)来提供显示出改善的调制效率和“啁啾”(即,时变光学相位)的控制的硅基光学调制器 节点)。 特别地,公共节点被偏置以将硅基光调制器的电压摆幅移动到其累积区域中,其随着施加电压(较大的OMA)和改善的消光比而呈现较大的相位变化。 积聚区域中的响应也是相对线性的,从而可以更容易地控制啁啾声。 电调制输入信号(及其反相)作为分离的输入施加到调制器的每个臂的第二区域(例如,SOI区域)。