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    Dynamic multitone simulation scenario planning
    15.
    发明授权
    Dynamic multitone simulation scenario planning 有权

    公开(公告)号：US10230584B1

    公开(公告)日：2019-03-12

    申请号：US15201295

    申请日：2016-07-01

    Applicant: INPHI CORPORATION

    Inventor： Hari Shankar ,  Ariel Nachum ,  Ariel Leonardo Vera Villarroel

    IPC: H04L27/34 ,  H04L12/24

    Abstract: Systems and methods for dynamic multitone simulation scenario planning. A method commences upon accessing a server in a circuit simulation environment to generate a multitone simulation signal to accurately simulate non-linear circuit characteristics. The tones of the multitone simulation signal are derived from a subset of possible tones based on certain properties. Some properties serve to eliminate harmonic and intermodulation products that conflict with the tones in the subset. The amplitude and phase for each tone is determined based on certain constraints. A multitone transient signal is generated from the selected tone subset and associated tone attributes to facilitate a circuit simulation. Characteristics of the multitone transient signal and/or simulation results from the circuit simulation can be analyzed to facilitate dynamically planning simulation scenarios that use multitone simulation signals.

    Off quadrature biasing of Mach Zehnder modulator for improved OSNR performance
    17.
    发明授权
    Off quadrature biasing of Mach Zehnder modulator for improved OSNR performance 有权
    马赫曾德调制器的正交偏置关闭，以提高OSNR性能

    公开(公告)号：US09523867B2

    公开(公告)日：2016-12-20

    申请号：US15072866

    申请日：2016-03-17

    Applicant: INPHI CORPORATION

    Inventor： Radhakrishnan L. Nagarajan ,  Hari Shankar ,  Masaki Kato ,  Yang Fu

    IPC: G02B5/12 ,  G02F1/01 ,  G02F1/035 ,  G02F1/225 ,  H01S3/067 ,  H01S3/16 ,  G02F1/21

    CPC classification number: G02F1/0123 ,  G02B6/12007 ,  G02F1/0147 ,  G02F1/025 ,  G02F1/225 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2202/105 ,  H01S3/06754 ,  H01S3/1608 ,  H01S5/0085 ,  H01S5/0687 ,  H01S5/4012 ,  H01S5/4087 ,  H04B10/505 ,  H04B10/50575

    Abstract: An integrated optical modulator device. The device can include a driver module coupled to an optical modulator. The optical modulator is characterized by a raised cosine transfer function. This optical modulator can be coupled to a light source and a bias control module, which is configured to apply an off-quadrature bias to the optical modulator. This bias can be accomplished by applying an inverse of the modulator transfer function to the optical modulator in order to minimize a noise variance. This compression function can result in an optimized increased top eye opening for a signal associated with the optical modulator. Furthermore, the optical modulator can be coupled to an EDFA (Erbium Doped Fiber Amplifier) that is coupled to a filter coupled an O/E (Optical-to-Electrical) receiver.

    Abstract translation: 集成光调制器装置。 该装置可以包括耦合到光调制器的驱动器模块。 光调制器的特征在于升高的余弦传递函数。 该光调制器可以耦合到光源和偏置控制模块，该偏置控制模块被配置为向光调制器施加非正交偏置。 可以通过将调制器传递函数的反相应用于光调制器来实现该偏置，以便最小化噪声方差。 该压缩功能可以导致用于与光学调制器相关联的信号的优化的增加的顶部眼睛开放。 此外，光调制器可以耦合到耦合到耦合到O / E（光 - 电）接收器的滤波器的EDFA（掺铒光纤放大器）。

    Off quadrature Mach-Zehnder modulator biasing
    18.
    发明授权
    Off quadrature Mach-Zehnder modulator biasing 有权

    公开(公告)号：US10116391B2

    公开(公告)日：2018-10-30

    申请号：US15802338

    申请日：2017-11-02

    Applicant: INPHI CORPORATION

    Inventor： Todd Rope ,  Radhakrishnan L. Nagarajan ,  Hari Shankar

    IPC: G02F1/01 ,  H04B10/516

    Abstract: The present invention relates to telecommunication techniques and integrated circuit (IC) devices. More specifically, embodiments of the present invention provide an off-quadrature modulation system. Once an off-quadrature modulation position is determined, a ratio between DC power transfer amplitude and dither tone amplitude for a modulator is as a control loop target to stabilize off-quadrature modulation. DC power transfer amplitude is obtained by measuring and sampling the output of an optical modulator. Dither tone amplitude is obtained by measuring and sampling the modulator output and performing calculation using the optical modulator output values and corresponding dither tone values. There are other embodiments as well.

    Transmitter gain imbalance and skew optimization for coherent transmitters
    20.
    发明授权
    Transmitter gain imbalance and skew optimization for coherent transmitters 有权

    公开(公告)号：US09819412B1

    公开(公告)日：2017-11-14

    申请号：US15146815

    申请日：2016-05-04

    Applicant: INPHI CORPORATION

    Inventor： Hari Shankar ,  Ariel Nachum

    IPC: H04B10/00 ,  H04B10/077 ,  H04B10/58

    CPC classification number: H04B10/50575 ,  H04B10/0731

    Abstract: The present invention is directed to communication systems and techniques thereof. More specifically, embodiments of the present invention provide a calibration system for optical transmitter. The calibration system provides a predetermined set of operating parameters to the optical transmitter and measures the second harmonic value of the transmitter output. A calibrated set of parameters is determined by selecting operating parameters associated with the minimum second harmonic value. There are other embodiments as well.

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