公开(公告)号：US20180375587A1

公开(公告)日：2018-12-27

申请号：US15633353

申请日：2017-06-26

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Sung CHOI ,  James STEWART ,  Radhakrishnan L. NAGARAJAN ,  Paul YU ,  Ilya LYUBOMIRSKY

IPC: H04B10/61 ,  H04B10/67 ,  H04B10/69 ,  H04L27/18 ,  G02B6/12 ,  G02B6/293 ,  H04B17/20

CPC classification number: H04B10/614 ,  G02B6/12007 ,  G02B6/29347 ,  H04B10/07953 ,  H04B10/675 ,  H04B10/677 ,  H04B10/69 ,  H04B17/20 ,  H04L27/06 ,  H04L27/18

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.

公开(公告)号：US20180262273A1

公开(公告)日：2018-09-13

申请号：US15976659

申请日：2018-05-10

Applicant: INPHI CORPORATION

Inventor： Radhakrishnan L. NAGARAJAN ,  Todd ROPE

IPC: H04B10/524 ,  H03M1/68 ,  G02F1/01 ,  G02F1/225 ,  G02F1/21

CPC classification number: H04B10/524 ,  G02F1/0123 ,  G02F1/2255 ,  G02F1/2257 ,  G02F2001/212 ,  H03M1/682 ,  H04B10/5161 ,  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.

公开(公告)号：US20180109324A1

公开(公告)日：2018-04-19

申请号：US15832296

申请日：2017-12-05

Applicant: INPHI CORPORATION

Inventor： Radhakrishnan L. NAGARAJAN ,  Todd ROPE

IPC: H04B10/524 ,  H03M1/68 ,  G02F1/01 ,  G02F1/225 ,  G02F1/21

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.

公开(公告)号：US20210058160A1

公开(公告)日：2021-02-25

申请号：US17090482

申请日：2020-11-05

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Hari SHANKAR ,  Radhakrishnan L. NAGARAJAN

IPC: H04B10/516 ,  H04B10/40 ,  H04B10/079 ,  H04B10/572 ,  H04L1/00 ,  H04B10/50 ,  H04L1/20

Abstract: The present invention is directed to communication systems and methods. In a specific embodiment, the present invention provides an optical receiver that receives a data stream from an optical transmitter. The optical receiver determines a histogram contour parameter using the data stream and inserts the histogram contour parameter into a back-channel data segment, which is then transmitted to the optical transmitter. The optical transmitter changes its data transmission setting based on the histogram contour parameter. There are other embodiments as well.

公开(公告)号：US20200021364A1

公开(公告)日：2020-01-16

申请号：US16582985

申请日：2019-09-25

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Hari SHANKAR ,  Radhakrishnan L. NAGARAJAN

IPC: H04B10/516 ,  H04B10/50 ,  H04L1/00 ,  H04B10/572 ,  H04B10/079 ,  H04B10/40

Abstract: The present invention is directed to communication systems and methods. In a specific embodiment, the present invention provides an optical receiver that receives a data stream from an optical transmitter. The optical receiver determines a histogram contour parameter using the data stream and inserts the histogram contour parameter into a back-channel data segment, which is then transmitted to the optical transmitter. The optical transmitter changes its data transmission setting based on the histogram contour parameter. There are other embodiments as well.

公开(公告)号：US20190319703A1

公开(公告)日：2019-10-17

申请号：US16449159

申请日：2019-06-21

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Radhakrishnan L. NAGARAJAN

IPC: H04B10/079 ,  H04B10/40 ,  H04L1/00

Abstract: The present invention is directed to communication systems and methods. According to an embodiment, a receiving optical transceiver determines signal quality for signals received from a transmitting optical transceiver. Information related to the signal quality is embedded into back-channel data and sent to the transmitting optical transceiver. The transmitting optical transceiver detects the presence of the back-channel data and adjusts one or more of its operating parameters based on the back-channel data. There are other embodiments as well.

公开(公告)号：US20190013872A1

公开(公告)日：2019-01-10

申请号：US15644342

申请日：2017-07-07

Applicant: Inphi Corporation

Inventor： Todd ROPE ,  Hari SHANKAR ,  Radhakrishnan L. NAGARAJAN

IPC: H04B10/516 ,  H04B10/40 ,  H04B10/079 ,  H04B10/572 ,  H04L1/00 ,  H04B10/50

CPC classification number: H04B10/5161 ,  H04B10/07953 ,  H04B10/40 ,  H04B10/5057 ,  H04B10/572 ,  H04L1/0026 ,  H04L1/004 ,  H04L1/0045 ,  H04L1/203

Abstract: The present invention is directed to communication systems and methods. In a specific embodiment, the present invention provides an optical receiver that receives a data stream from an optical transmitter. The optical receiver determines a histogram contour parameter using the data stream and inserts the histogram contour parameter into a back-channel data segment, which is then transmitted to the optical transmitter. The optical transmitter changes its data transmission setting based on the histogram contour parameter. There are other embodiments as well.

公开(公告)号：US20200266899A1

公开(公告)日：2020-08-20

申请号：US16828820

申请日：2020-03-24

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Hari SHANKAR ,  Radhakrishnan L. NAGARAJAN

IPC: H04B10/516 ,  H04B10/40 ,  H04B10/079 ,  H04B10/572 ,  H04L1/00 ,  H04B10/50 ,  H04L1/20

Abstract: The present invention is directed to communication systems and methods. In a specific embodiment, the present invention provides an optical receiver that receives a data stream from an optical transmitter. The optical receiver determines a histogram contour parameter using the data stream and inserts the histogram contour parameter into a back-channel data segment, which is then transmitted to the optical transmitter. The optical transmitter changes its data transmission setting based on the histogram contour parameter. There are other embodiments as well.

公开(公告)号：US20190036610A1

公开(公告)日：2019-01-31

申请号：US16146936

申请日：2018-09-28

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Radhakrishnan L. NAGARAJAN ,  Hari SHANKAR

IPC: H04B10/516 ,  H01S5/0687

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 ,  H01S5/142 ,  H01S5/4012 ,  H04B10/505 ,  H04B10/50575 ,  H04B10/5561 ,  H04J14/02

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.

公开(公告)号：US20180062751A1

公开(公告)日：2018-03-01

申请号：US15802338

申请日：2017-11-02

Applicant: INPHI CORPORATION

Inventor： Todd ROPE ,  Radhakrishnan L. NAGARAJAN ,  Hari SHANKAR

IPC: 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 ,  H01S5/142 ,  H01S5/4012 ,  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.