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公开(公告)号：US09780881B1
公开(公告)日：2017-10-03
申请号：US14881401
申请日：2015-10-13
Applicant: INPHI CORPORATION
Inventor： Todd Rope , Radhakrishnan L. Nagarajan , Jamal Riani , Pulkit Khandelwal
IPC: H04B10/40 , H04B10/079
CPC classification number: H04B10/40 , H04B10/0731 , H04B10/0795 , H04B10/524
Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.
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公开(公告)号：US10826621B2
公开(公告)日：2020-11-03
申请号：US16720472
申请日：2019-12-19
Applicant: INPHI CORPORATION
Inventor： Todd Rope , Sung Choi , James Stewart , Radhakrishnan L. Nagarajan , Paul Yu , Ilya Lyubomirsky
IPC: H04B10/079 , H04B10/61 , H04B10/67 , H04B10/69 , H04L27/18 , G02B6/12 , G02B6/293 , H04B17/20 , H04L27/06
Abstract: The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.
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公开(公告)号：US10425164B2
公开(公告)日：2019-09-24
申请号：US16146936
申请日：2018-09-28
Applicant: INPHI CORPORATION
Inventor： Todd Rope , Radhakrishnan L. Nagarajan , Hari Shankar
IPC: H04B10/516 , G02F1/01 , G02F1/225 , H01S5/0687 , H01S5/40 , H04B10/50 , H01S5/14 , H04J14/02 , H04B10/556 , G02F1/025 , H01S3/067 , H01S5/00 , G02F1/21
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.
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公开(公告)号：US10116393B2
公开(公告)日：2018-10-30
申请号：US15976659
申请日：2018-05-10
Applicant: INPHI CORPORATION
Inventor： Radhakrishnan L. Nagarajan , Todd Rope
Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.
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公开(公告)号：US09998231B2
公开(公告)日：2018-06-12
申请号：US15832296
申请日：2017-12-05
Applicant: INPHI CORPORATION
Inventor： Radhakrishnan L. Nagarajan , Todd Rope
CPC classification number: H04B10/5161 , G02F1/0123 , G02F1/2255 , G02F1/2257 , G02F2001/212 , H03M1/682 , H04B10/524 , H04B10/541
Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.
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Patent Agency Ranking
公开(公告)号：US09838134B1
公开(公告)日：2017-12-05
申请号：US14984849
申请日：2015-12-30
Applicant: INPHI CORPORATION
Inventor： Todd Rope , Radhakrishnan L. Nagarajan , Hari Shankar
IPC: G02F1/01 , H04B10/516
CPC classification number: H04B10/516 , G02F1/0123 , G02F1/0147 , G02F1/025 , G02F1/225 , G02F1/2255 , G02F2001/212 , G02F2202/105 , H01S3/06754 , H01S5/0085 , H01S5/0687 , H01S5/4012 , H01S5/4087 , H04B10/505 , H04B10/50575
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.
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公开(公告)号：US09660730B1
公开(公告)日：2017-05-23
申请号：US15069702
申请日：2016-03-14
Applicant: INPHI CORPORATION
Inventor： Todd Rope
IPC: H04B10/508 , H04B10/54
CPC classification number: H04B10/07953 , H04B10/0795 , H04B10/40 , H04B10/508 , H04B10/54 , H04B10/60 , H04B10/801 , H04L27/06
Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.
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公开(公告)号：US09634760B1
公开(公告)日：2017-04-25
申请号：US15407163
申请日：2017-01-16
Applicant: INPHI CORPORATION
Inventor： Todd Rope
IPC: H04B10/08 , H04B10/077 , H04B10/079
CPC classification number: H04B10/0775 , H04B10/07955 , H04B10/07957 , H04B10/40
Abstract: A system and method for calibrating an optical module. The optical module including a microprocessor with non-volatile memory is provided at a calibration station for measuring calibrated value of a device parameter against raw values starting from minimum value in each of multiple zones of a primary parameter with one or more secondary parameters at least being set to a basis calibration point to determine coefficients for generating a N-spline function for the multiple zones and multiple multipliers for each zone corresponding to multiple calibration points. The coefficients and multiple multipliers are stored in the non-volatile memory and reused respectively for calculating a basis calibrated value based on any current raw value of the primary parameter a N-spline function in particular zone and for determining a final multiplier by interpolation of the multiple multipliers associated with the one or more secondary parameters, leading to a calibrated value for any condition.
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公开(公告)号：US10715255B2
公开(公告)日：2020-07-14
申请号：US16536162
申请日：2019-08-08
Applicant: INPHI CORPORATION
Inventor： Todd Rope , Radhakrishnan L. Nagarajan , Hari Shankar
IPC: H04B10/516 , G02F1/01 , G02F1/225 , H01S5/0687 , H01S5/40 , H04B10/50 , H01S5/14 , H04B10/556 , H04J14/02 , G02F1/025 , H01S3/067 , H01S5/00 , G02F1/21
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.
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公开(公告)号：US10560198B2
公开(公告)日：2020-02-11
申请号：US16408256
申请日：2019-05-09
Applicant: INPHI CORPORATION
Inventor： Todd Rope , Sung Choi , James Stewart , Radhakrishnan L. Nagarajan , Paul Yu , Ilya Lyubomirsky
IPC: H04B10/079 , H04B10/61 , H04B10/67 , H04B10/69 , H04L27/18 , G02B6/12 , G02B6/293 , H04B17/20 , H04L27/06
Abstract: The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.
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