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31. 发明申请

US20180198531A1 Method and Apparatus for Characterization and Compensation of Optical Impairments in InP-Based Optical Transmitter 审中-公开
公开(公告)号：US20180198531A1
公开(公告)日：2018-07-12
申请号：US15915032
申请日：2018-03-07
申请人： Finisar Corporation
发明人： Suhas P. Bhandare , Heider N. Ereifej , Ihab E. Khalouf , Mark Colyar
IPC分类号： H04B10/58 , H04B10/588 , H04B10/079 , H04B10/564 , H04B10/516
CPC分类号： H04B10/58 , H04B10/07955 , H04B10/5053 , H04B10/5057 , H04B10/516 , H04B10/564 , H04B10/588
摘要： 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. An optical signal comprising a Nyquist-pulse-shape is generated at an output of the optical transmitter.

32. 发明申请

US20180196209A1 Optical Subassembly for an Optical Receiver, Optical Receiver and Transceiver Comprising the Same, and Methods of Making and Using the Same 审中-公开
公开(公告)号：US20180196209A1
公开(公告)日：2018-07-12
申请号：US15324959
申请日：2017-01-06
申请人： Source Photonics (Chengdu) Company Limited
发明人： Moshe AMIT
IPC分类号： G02B6/42 , H04B10/69 , H04B10/58 , H04B10/40
CPC分类号： G02B6/4298 , G02B6/42 , G02B6/4206 , G02B6/4214 , G02B6/4246 , G02B6/4261 , H04B10/40 , H04B10/58 , H04B10/691
摘要： An optical subassembly, optical or optoelectronic receivers and transceivers including the same, and methods of making and using the same are disclosed. The optical subassembly includes a mirror configured to reflect an incoming optical signal at a first predetermined angle, a lens configured to receive the incoming optical signal from the mirror and focus the incoming optical signal onto a target, and an optical mount comprising at least one first surface configured to support the mirror, at least one second surface configured to support and/or secure the lens at a second predetermined angle, and a structural block configured to position and/or arrange (i) the at least one first surface at a third predetermined angle related to the first predetermined angle and (ii) the at least one second surface at the first and/or second predetermined angle. The first and/or second predetermined angle(s) are adapted to reduce a reflectance of the incoming optical signal.

33. 发明申请

US20180159650A1 CHIRP MANAGED LASER GENERATION FOR NEXT GENERATION PASSIVE OPTICAL NETWORKS 审中-公开
公开(公告)号：US20180159650A1
公开(公告)日：2018-06-07
申请号：US15729650
申请日：2017-10-10
申请人： ZTE Corporation
发明人： Jianjun Yu , Hung-Chang Chien
IPC分类号： H04J14/02 , H04B10/50 , H04B10/58
CPC分类号： H04J14/0205 , H04B10/504 , H04B10/506 , H04B10/58 , H04B10/675 , H04J14/0212 , H04J14/022
摘要： A technique for optical signal transmission includes generating a plurality of double sideband modulated optical signals by modulating a plurality of source data signals using a plurality of direct modulation laser (DML) optical sources, wherein the plurality of double sideband modulated optical signals occupy non-overlapping neighboring optical frequency bands, generating a chirp-managed laser (CML) output signal by multiplexing the plurality of double sideband modulated optical signals using a wavelength-selective multiplexer, and transmitting the CML output signal over an optical transport medium.

34. 发明申请

US20180102852A1 CIRCUIT FOR MULTI-PATH INTERFERENCE MITIGATION IN AN OPTICAL COMMUNICATION SYSTEM 审中-公开
公开(公告)号：US20180102852A1
公开(公告)日：2018-04-12
申请号：US15836603
申请日：2017-12-08
申请人： INPHI CORPORATION
发明人： Benjamin P. SMITH , Jamal RIANI , Sudeep BHOJA , Arash FARHOODFAR , Vipul BHATT
IPC分类号： H04B10/58 , H04B10/69 , H04B10/2507 , H04B10/516
CPC分类号： H04B10/58 , H04B10/2507 , H04B10/5161 , H04B10/541 , H04B10/697 , H04B10/6971
摘要： A circuit and method for mitigating multi-path interference in direct detection optical systems is provided. Samples of an optical signal having a pulse amplitude modulated (PAM) E-field are processed by generating a PAM level for each sample. For each sample, the sample is subtracted from the respective PAM level to generate a corresponding error sample. The error samples are lowpass filtered to produce estimates of multi-path interference (MPI). For each sample, one of the estimates of MPI is combined with the sample to produce an interference-mitigated sample.

35. 发明申请

US20180033547A1 ELECTRIC SYSTEM WITH CONTROL WINDING AND METHOD OF ADJUSTING SAME 审中-公开
公开(公告)号：US20180033547A1
公开(公告)日：2018-02-01
申请号：US15550808
申请日：2016-02-16
申请人： Maschinenfabrik Reinhausen GmbH
发明人： Anatoli SAVELIEV , Oliver STERZ
IPC分类号： H01F29/04 , H04B10/508 , H04B10/58 , H01S5/0683
CPC分类号： H01F29/04 , H01S5/042 , H01S5/06213 , H01S5/06832 , H01S5/06835 , H04B10/508 , H04B10/58
摘要： The invention relates to a method for changing the active number of turns of a control winding (12) in an electric system (10). The control winding is coupled to an AC voltage network for a specified period duration T, is designed for a specified nominal current strength IN, and comprises a first and a second tap (121, 122). The control winding is switched from a first continuous current state, in which a load current flows from the first tap to a load discharge line (15) via a first main path and the second tap is separated from the load discharge line, to a second continuous current state, in which the load current flows from the second tap to the load discharge line via a second main path and the first tap is separated from the load discharge line, according to a specified switch sequence plan. The switch sequence plan specifies that starting from the first continuous current state, the first tap is connected or remains connected to the load discharge line via a first transition path, and the first main path is separated in a switch step a; in a switch step b, the second tap is connected to the load discharge line via a second transition path such that a circuit current iK flows through the transition paths on the basis of the stage voltage between the taps; in a switch step c, the first tap is separated from the load discharge line; and in a switch step d, the second tap is connected to the load discharge line via the second main path; wherein at at least one specified test time tT between switch steps a and c, a test is carried out to determine whether the first main path is separated; a current strength IL of the load current is ascertained; and the test time tT depends on the load current strength IL.

36. 发明申请

US20180006728A1 OPTICAL TRANSCEIVER, OPTICAL COMMUNICATION APPARATUS, AND METHOD OF CONTROLLING LIGHT RECEIVING ELEMENT 审中-公开
公开(公告)号：US20180006728A1
公开(公告)日：2018-01-04
申请号：US15543303
申请日：2016-01-05
申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.
发明人： Shuitsu YUDA
IPC分类号： H04B10/58 , H04B10/40
CPC分类号： H04B10/58 , H04B10/40 , H04B10/504 , H04B10/6911
摘要： An optical communication apparatus according to an embodiment of the present invention includes: a light emitting element; a transmission driver that drives the light emitting element; a light receiving element capable of changing a multiplication factor by a bias voltage; a temperature sensor; a computing unit that calculates a drive rate of the transmission driver; and an adjusting unit that adjusts the bias voltage applied to the light receiving element. The adjusting unit adjusts the bias voltage by linear computation using a plurality of target values of the bias voltage for combinations of a plurality of temperatures and a plurality of drive rates, based on a temperature detected by the temperature sensor and a result of calculation of the drive rate.

37. 发明申请

US20170237498A1 OPTICAL COMMUNICATION WITH SOME COMPENSATION OF NONLINEAR OPTICAL EFFECTS 审中-公开
公开(公告)号：US20170237498A1
公开(公告)日：2017-08-17
申请号：US15434687
申请日：2017-02-16
申请人： Alcatel-Lucent USA Inc.
发明人： René-Jean Essiambre , Chongjin Xie
IPC分类号： H04B10/40 , H04B10/69 , H04B10/58
CPC分类号： H04B10/2543 , H04B10/614 , H04B10/6163
摘要： We disclose an optical transport system configured to reduce nonlinear signal distortions using an electronic phase rotation, the phase value of which is determined using pre-filtering, e.g., via a low-pass filter, of the digital samples representing an optical communication signal prior to applying a squaring operation to the digital samples. In some embodiments, the phase value used in the electronic phase rotation can be determined using double filtering of the digital samples that, in addition to the pre-filtering, employs post-filtering, e.g., via another low-pass filter, of the digital samples generated by the squaring operation. The electronic phase rotation can be implemented as part of a backward-propagation algorithm that, in addition to reducing the nonlinear signal distortions, provides at least partial dispersion compensation. In various embodiments, the corresponding backward-propagation module can be incorporated into the transmitter's digital signal processor (DSP) or the receiver's DSP.

38. 发明授权

US09735879B2 Near-threshold optical transmitter pre-distortion 有权
公开(公告)号：US09735879B2
公开(公告)日：2017-08-15
申请号：US14502734
申请日：2014-09-30
申请人： INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人： Fuad E. Doany , Daniel M. Kuchta , Jonathan E. Proesel , Alexander V. Rylyakov , Clint L. Schow , Marc A. Taubenblatt
IPC分类号： H04B10/04 , H04B10/508 , H04B10/58 , H04B10/2507 , H04B10/50
CPC分类号： H04B10/508 , H04B10/2507 , H04B10/504 , H04B10/50572 , H04B10/58
摘要： Methods an systems for low-power transmission include biasing an emitter in a non-linear operating range of the emitter near a threshold current of the emitter. A data signal is distorted to add a precursor pulse to a rising edge of a data waveform to quickly bring the emitter into a linear operating range. The distorted data signal is transmitted at the emitter.

39. 发明授权

US09712251B2 Distortion compensation device and compensation distortion method 有权
公开(公告)号：US09712251B2
公开(公告)日：2017-07-18
申请号：US14836565
申请日：2015-08-26
申请人： FUJITSU LIMITED
发明人： Hironobu Hongou
IPC分类号： H04B10/588 , H04B10/2507 , H04B10/58 , H04L25/08 , H04B10/079
CPC分类号： H04B10/58 , H04B10/0799 , H04B10/2507 , H04B10/588 , H04L25/08
摘要： A distortion compensation device includes: a signal processing unit to perform signal processing on a symbol; a storage unit to store a distortion compensation value for every pattern string including a symbol of interest and predetermined number of symbols ahead of the symbol of interest among a plurality of input symbols, a distortion in the signal processing unit being compensated for such that the symbol of interest is corrected to a target value based on the distortion compensation value; a first acquisition unit to acquire a pattern string of interest including the current input symbol and the predetermined number of input symbols ahead of the current input symbol; a second acquisition unit to acquire the distortion compensation value associated with the pattern string of interest from the storage unit; and a setting unit to set the distortion compensation value to a correction value of the signal processing unit.

40. 发明申请

US20170187455A1 TECHNIQUES FOR OPTICAL WIRELESS COMMUNICATION 有权
公开(公告)号：US20170187455A1
公开(公告)日：2017-06-29
申请号：US15088897
申请日：2016-04-01
申请人： Intel Corporation
发明人： Richard D. Roberts , Javier Perez-Ramirez , Parmoon Seddighrad , Roni Abiri
IPC分类号： H04B10/116 , H04B10/58 , H04B10/524 , H04L7/00 , H04B10/61
CPC分类号： H04B10/116 , H04B10/524 , H04B10/58 , H04B10/612 , H04B10/616 , H04L7/0075 , H04L7/042
摘要： Optical wireless communication techniques are described and claimed. In one embodiment, the disclosure relates to method and apparatus to provide optical signaling with visible light having variable pulse position modulation (VPPM). The optical signal includes a Start Frame Delimiter (SFD) which indicates beginning of an asynchronous optical signaling. The VPPM signaling includes a lower frequency time varying amplitude component that when subsampled by a low frame rate camera results in alias induced flicker or blinking. Such signals are quickly recognizable as signals with modulated data. In another embodiment, the disclosure provides a system, device and method for decoding a Start Frame Delimiter (SFD) to indicate arrival of incoming VPPM optical data.

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