公开(公告)号：US09755758B2

公开(公告)日：2017-09-05

申请号：US14994762

申请日：2016-01-13

Applicant: VIAVI SOLUTIONS INC.

Inventor： Josh Philipson ,  Chris Wagner

IPC: H04B17/00 ,  H04B10/556 ,  H04J14/02 ,  H04B10/079 ,  H04Q11/00 ,  H04B10/572 ,  H04B10/54 ,  H04B10/532

CPC classification number: H04B10/5563 ,  H04B10/0793 ,  H04B10/07955 ,  H04B10/532 ,  H04B10/541 ,  H04B10/572 ,  H04J14/0212 ,  H04Q11/0066 ,  H04Q2011/0016 ,  H04Q2011/0083

Abstract: According to an example, an optical transmission device may include a spatial light modulator having a plurality of cells, in which different wavelengths of a light beam are to impinge upon different groups of pixels along a dispersion direction. The device may also include a driver mechanism to modulate, at a first frequency, a first group of the plurality of cells upon which light having a first wavelength impinges to impress a first frequency fluctuation onto a property of an output light including the first wavelength and to modulate, at a second frequency, a second group of the plurality of cells upon which light having a second wavelength impinges to impress a second frequency fluctuation onto a property of an output light including the second wavelength, in which the second frequency modulation differs from the first frequency modulation.

公开(公告)号：US09742572B2

公开(公告)日：2017-08-22

申请号：US14984318

申请日：2015-12-30

Applicant: Time Warner Cable Enterprises LLC

Inventor： Paul D. Brooks ,  Peter Wolff

IPC: H04L12/10

CPC classification number: H04L12/10 ,  H04B10/07955 ,  H04B10/69

Abstract: Embodiments include systems and methods for scaling power level of an upstream signal by a device processor of a head-end device in a communication network. In embodiments, the device processor may determine a power level of the signal received at the head-end device from a client device. The device processor may determine a difference between the power level of the received signal and a target power level of an analog-to-digital converter of the head-end device, and may adjust the power level of the received signal at the head-end device based on the determined difference. In embodiments, the device processor may determine a power level of an upstream signal to be received by the head-end device, may determine a difference between the power level of the received signal and the target power level, and may adjust the power level of a received signal at the head-end device based on the determined difference.

公开(公告)号：US20170238075A1

公开(公告)日：2017-08-17

申请号：US15249998

申请日：2016-08-29

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Nicolas Dupuis ,  Daniel M. Kuchta ,  Benjamin G. Lee ,  Alexander Rylyakov ,  Clint L. Schow

IPC: H04Q11/00 ,  H04B10/079

CPC classification number: H04Q11/0005 ,  H04B10/07955 ,  H04Q2011/0039 ,  H04Q2011/0049 ,  H04Q2011/0058

Abstract: Methods and systems for bias control in an optical switch fabric include monitoring optical power at outputs of a plurality of switch elements in an N×N switch fabric that has N inputs, N outputs, and M≧2 stages. A bias control of a first of the plurality of switch elements is adjusted. It is determined whether the optical power at the outputs of the first switch element after bias control adjustment conform more closely to a predetermined criterion relative to the monitored optical power at the outputs of the first switch element prior to adjustment. The adjusting and determining steps are repeated for each of the remainder of the plurality of switch elements.

公开(公告)号：US20170230120A1

公开(公告)日：2017-08-10

申请号：US15407063

申请日：2017-01-16

Applicant: FUJITSU LIMITED

Inventor： Ryou Okabe ,  Toshiki Tanaka ,  Tomoo Takahara ,  Masato Nishihara

IPC: H04B10/61 ,  H04B10/079

CPC classification number: H04B10/6165 ,  H04B10/0779 ,  H04B10/0795 ,  H04B10/07955

Abstract: A method for estimating characteristics of an optical receiver includes: a generating process, a monitoring process, a suppressing process, a guiding process and an estimating process. The generating process generates a modulated optical signal based on an oscillation signal. The monitoring process monitors an optical spectrum of the modulated optical signal or a spectrum of an electric signal obtained by performing optical-to-electrical conversion on the modulated optical signal. The suppressing process suppresses a modulation component of an upper sideband or a lower sideband of the modulated optical signal based on the optical spectrum of the modulated optical signal or the spectrum of the electric signal. The guiding process guides the modulated optical signal in which the modulation component is suppressed to the optical receiver. The estimating process estimates the characteristics of the optical receiver based on an output signal of the optical receiver.

公开(公告)号：US20170222725A1

公开(公告)日：2017-08-03

申请号：US15488507

申请日：2017-04-16

Applicant: Finisar Corporation

Inventor： Suhas P. Bhandare ,  Heider N. Ereifej ,  Ihab E. Khalouf ,  Mark Colyar

IPC: H04B10/54 ,  H04B10/508

CPC classification number: H04B10/54 ,  H04B10/07955 ,  H04B10/508 ,  H04B10/516 ,  H04B10/564 ,  H04B10/58 ,  H04B10/588

Abstract: A method and apparatus for characterizing and compensating optical impairments in an optical transmitter includes operating an optical transmitter comprising a first and second parent MZ, each comprising a plurality of child MZ modulators that are biased at respective initial operating points. An electro-optic RF transfer function is generated for each of the plurality of child MZ modulators. Curve fitting parameters are determined for each of the plurality of electro-optic RF transfer functions and operating points of each child MZ modulator are determined using the curve fitting parameters. An IQ power imbalance is determined using the curve fitting parameters. Initial RF drive power levels are determined that compensate for the determined IQ power imbalance. The XY power imbalance is determined for initial RF drive power levels using the curve fitting parameters. The operating RF drive powers are determined that at least partially compensate for the first and second IQ power imbalances and for the XY power imbalance for the optical transmitter.

公开(公告)号：US09722700B2

公开(公告)日：2017-08-01

申请号：US14807446

申请日：2015-07-23

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata

IPC: H04B17/00 ,  H04B10/079 ,  H04J14/02

CPC classification number: H04B10/07957 ,  H04B10/07955 ,  H04J14/0221

Abstract: A wavelength division multiplexing system and method featuring a wavelength monitor that is configured to receive a portion of a combined signal of wavelength division multiplexing channels and determine the wavelengths of each channel or the guardband between each channel in the combined signal. The wavelength monitor determines if there is excess laser drift for each channel in the combined signal. If excess laser drift is determined, feedback is sent to the transmitter for the signal with excess laser drift and the signal is adjusted to produce a target wavelength. The wavelength monitor may utilize optical intradyning in order to monitor the wavelengths of each channel in the combined signal.

公开(公告)号：US09722699B2

公开(公告)日：2017-08-01

申请号：US14947758

申请日：2015-11-20

Applicant: Cable Television Laboratories, Inc.

Inventor： Michael Sprenger ,  Lane Johnson ,  Curtis Knittle

IPC: H04B10/80 ,  H04B10/079 ,  H04B10/032 ,  H04B10/272

CPC classification number: H04B10/07955 ,  H04B10/032 ,  H04B10/0793 ,  H04B10/272 ,  H04B10/807

Abstract: Systems and methods presented herein provide for operating an optical network terminal (ONT) during a power outage. In one embodiment, an ONT includes an opto-electrical converter operable to receive an optical signal and to convert the optical signal to a data signal, and a data processing module operable to process data from the data signal. The ONT also includes a power management unit operable to detect a power outage of a power supply, to initiate a low power mode, to terminate a portion of data processing by the data processing module based on the low power mode, to convert the optical signal to electrical power, and to maintain operation of the low power mode utilizing the electrical power. The power management unit is further operable to monitor the power supply for restoration of power, and to reinitialize the data processing module upon restoration of power.

公开(公告)号：US20170163339A1

公开(公告)日：2017-06-08

申请号：US15435807

申请日：2017-02-17

Applicant: Samtec, Inc.

Inventor： Joshua R. CORNELIUS ,  Eric J. ZBINDEN ,  William J. KOZLOVSKY ,  David A. LANGSAM

IPC: H04B10/079 ,  H04B10/67 ,  G02B6/42

CPC classification number: H04B10/07955 ,  G01M11/3145 ,  G01M11/335 ,  G02B6/4225 ,  G02B6/4246 ,  G02B6/4249 ,  G02B6/4269 ,  G02B6/428 ,  G02B6/4286 ,  G02B6/4295 ,  G02B6/43 ,  H04B10/672

Abstract: A method for determining receiver coupling efficiency includes varying optical power inputted into a half active optical cable to determine a maximum optical power at which the TIA squelches and determining a receiver coupling efficiency by calculating a ratio of a threshold optical power to the maximum optical power at which the TIA squelches. A method of determining link loss in a channel includes varying optical power of a light source to determine the maximum optical power at which the TIA squelches and determining the link loss in the channel by subtracting the maximum optical power from the threshold optical power. A method of determining link topology includes selecting a pattern of optical powers and matching a pattern of squelched and non-squelched outputs with the pattern of optical power. An active optical cable includes memory storing a value related to an initial link loss of the active optical cable.

公开(公告)号：US09673929B2

公开(公告)日：2017-06-06

申请号：US14810850

申请日：2015-07-28

Applicant: FUJITSU LIMITED

Inventor： Makoto Yamashita ,  Satoru Okano ,  Masahiro Yuki

IPC: H04B17/00 ,  H04J14/02 ,  H04B10/079 ,  H04B10/564

CPC classification number: H04J14/0221 ,  H04B10/07955 ,  H04B10/564

Abstract: An optical transmission apparatus including: an attenuator that attenuates a power of a first optical signal generated in a first modulation method to a first target level and attenuates a power of a second optical signal generated in a second modulation method, a modulation level in the second modulation method being lower than the modulation level in the first modulation method, to a second target level, the second target level being lower than the first target level; and a transmitter that sends a WDM signal including the first optical signal and the second optical signal that have been attenuated by the attenuator.

公开(公告)号：US20170139165A1

公开(公告)日：2017-05-18

申请号：US15058948

申请日：2016-03-02

Applicant: Facebook, Inc.

Inventor： Kirk Erik Burgess

IPC: G02B6/42 ,  H04B10/25 ,  H04B10/079 ,  G02B6/38 ,  G02B6/44

CPC classification number: G02B6/4286 ,  G02B6/2804 ,  G02B6/3895 ,  G02B6/3897 ,  G02B6/4452 ,  H04B10/07955 ,  H04B10/2503 ,  H04B10/2504 ,  H04B10/801

Abstract: A modular fiber optic patch panel system is disclosed. The system includes an enclosure and at least one patch panel module mounted in the enclosure. The enclosure includes a chassis with multiple module bays, each configured to receive a corresponding patch panel module. The patch panel modules each include a module housing, an input connector and an output connector. An optical directional coupler is connected to the input connector and a photodiode is positioned adjacent the optical directional coupler to measure an optical power level conveyed on the optical fiber. A data acquisition device is connected to the photodiode to capture the optical power level data and a microcontroller is connected to the data acquisition device to store the data.