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1. 发明授权

US12119880B2 Rapid polarization tracking in an optical channel 有权
公开(公告)号：US12119880B2
公开(公告)日：2024-10-15
申请号：US16988874
申请日：2020-08-10
申请人： Nokia Solutions and Networks OY
发明人： Thai Son Le
IPC分类号： H04B10/61 , H04B10/077 , H04B10/54 , H04J14/06 , H04B10/50
CPC分类号： H04B10/614 , H04B10/077 , H04B10/541 , H04B10/6164 , H04B10/6166 , H04J14/06 , H04B10/503
摘要： An optical receiver, e.g., for an Optical Supervisory Channel (OSC), whose optical front end comprises a polarization-diversity coherent optical receiver configured to receive a conventional intensity-modulated (e.g., OSC) signal. Four quadrature components of the received OSC signal detected by the polarization-diversity coherent optical receiver are sampled at a relatively high sampling rate and are used to calculate the Stokes parameters of the OSC signal. As a result, the Stokes parameters can be updated at the high sampling rate, which can be suitably selected to enable polarization tracking with a relatively high time resolution and/or at relatively high SOP-rotation speeds. The four detected quadrature components are appropriately combined in the receiver DSP to determine the intensity of the received OSC signal, which is then used in a conventional manner to recover the OSC data encoded therein.

2. 发明授权

US12015448B1 Fast frequency multiplexed optical network channel identification 有权
公开(公告)号：US12015448B1
公开(公告)日：2024-06-18
申请号：US17211558
申请日：2021-03-24
申请人： VeEX Inc.
发明人： Paul Chang
IPC分类号： H04B10/572 , H04B10/61 , H04J14/02
CPC分类号： H04B10/572 , H04B10/6166 , H04J14/02
摘要： A system comprising a generator and a receiver. The generator can be coupled to an optical network. The generator can be configured to generate a plurality of wavelengths of light. The plurality of wavelengths of light can be continuously cycled. The plurality of wavelengths of light can be modulated to encode information onto the plurality of wavelengths of light. The plurality of wavelengths of light can be multiplexed into a multiplexed light signal. The multiplexed light signal can be provided to a first wavelength division multiplexer of the optical network. The receiver can be coupled to the generator and the optical network. The receiver can be configured to receive a demultiplexed wavelength of light from a second wavelength division multiplexer of the optical network. The demultiplexed wavelength of light can be demodulated to decode information encoded onto the demultiplexed wavelength of light. Optical power of the demultiplexed wavelength of light can be measured. The decoded information and the optical power can be provided for display through an interface.

3. 发明授权

US11777613B2 Polarization change tracking apparatus, processing apparatus for received signal and methods thereof 有权
公开(公告)号：US11777613B2
公开(公告)日：2023-10-03
申请号：US17564736
申请日：2021-12-29
申请人： FUJITSU LIMITED
发明人： Jingnan Li , Yangyang Fan , Zhenning Tao
IPC分类号： H04B10/61 , H04J14/06
CPC分类号： H04B10/6166 , H04B10/6162 , H04J14/06
摘要： A polarization change tracking apparatus, a processing apparatus for a received signal and methods thereof. The polarization change tracking method includes: estimating a polarization change speed in a link according to a received signal; setting a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive; and performing compensation for polarization change on the received signal according to a set response coefficient of polarization tracking.

4. 发明授权

US10505641B2 Clock recovery for band-limited optical channels 有权
公开(公告)号：US10505641B2
公开(公告)日：2019-12-10
申请号：US15966697
申请日：2018-04-30
申请人： Nokia Solutions and Networks OY
发明人： Noriaki Kaneda , Stephan Weisser , Carlo Costantini
IPC分类号： H04B10/61 , H04B10/63
CPC分类号： H04B10/6161 , H04B10/611 , H04B10/613 , H04B10/614 , H04B10/6162 , H04B10/6166 , H04B10/63
摘要： A coherent optical receiver in which the channel equalizer and the clock-recovery circuit are connected in a nested-loop configuration, wherein the channel estimate generated by the equalizer is used to adjust the phase of the clock signal generated by the clock-recovery circuit. The channel equalizer can be implemented using a bank of time-domain or frequency-domain FIR filters. In an example embodiment, the clock-recovery circuit is configured to track the phase rotation corresponding to the equalized signals in a frequency-dependent manner; track the phase rotation in the channel equalizer either in a frequency-dependent manner or based on the mean signal delay therein; and adjust the phase of the clock signal based on an effective difference between these two phase rotations. The clock-recovery circuit enhances the clock tone by applying a Fourier transform to the squared absolute values of the equalized signals outputted by the channel equalizer.

5. 发明申请

US20180062759A1 METHODS FOR COMPENSATION OF CROSS-POLARIZATION MODULATION (XPOLM) IMPAIRMENTS IN COHERENT OPTICAL COMMUNICATIONS 审中-公开
公开(公告)号：US20180062759A1
公开(公告)日：2018-03-01
申请号：US15244071
申请日：2016-08-23
申请人： Mitsubishi Electric Research Laboratories, Inc.
发明人： Milutin Pajovic , Kieran Parsons , David Millar , Toshiaki Koike-Akino , Keisuke Kojima
IPC分类号： H04B10/61 , H04B3/32 , H04B10/079
CPC分类号： H04B10/6162 , H04B3/32 , H04B10/0795 , H04B10/2572 , H04B10/614 , H04B10/6166 , H04B2210/006
摘要： Methods and systems for decoding symbols transmitted over an optical channel having a cross-polarization modulation (XPolM) impairment, wherein an optical signal is polarized to encode the symbols on an x-polarization and an y-polarization before transmitted. The method including receiving the optical signal transmitted over the optical channel. Sampling the optical signal to produce a sequence of digital samples, wherein each digital sample includes a measurement of each polarization of the optical signal at an instance of time. Selecting a subset of the sequence of digital samples that includes a digital sample and neighboring digital samples on the sequence. Repeating the selecting and the determining for each digital sample remaining in the sequence of digital samples to produce a sequence of cross-talk coefficients; and decoding some of the symbols from the sequence of digital samples using cross-talk models with corresponding cross-talk coefficients, wherein method steps are performed using a processor.

6. 发明授权

US09866928B2 Intra-transceiver optical superchannel switching via RF sub-band multiplexing technique 有权
公开(公告)号：US09866928B2
公开(公告)日：2018-01-09
申请号：US14934078
申请日：2015-11-05
申请人： NEC Laboratories America, Inc.
发明人： Yue-Kai Huang , Shaoliang Zhang , Fatih Yaman , Ting Wang
IPC分类号： H04B10/61 , H04B10/516 , H04Q11/00 , H04J14/02
CPC分类号： H04Q11/0001 , H04B10/516 , H04B10/613 , H04B10/616 , H04B10/6166 , H04J14/0298
摘要： Systems and methods are disclosed for data communication by performing RF sub-band multiplexing and demultiplexing by cascading a radio-frequency (RF) mixing module and optical dual-polarized (DP) QPSK modulator forhybrid RF/optical IQ modulation; and performing intra-transceiver optical superchannel switching through the RF sub-band multiplexing.

7. 发明授权

US09722697B2 Polarization division multiplexing optical communication reception device, polarization division multiplexing optical communication system, and polarization division multiplexing optical communication method 有权
公开(公告)号：US09722697B2
公开(公告)日：2017-08-01
申请号：US14761371
申请日：2014-01-17
申请人： NEC Corporation
发明人： Daisaku Ogasahara
IPC分类号： H04B10/079 , H04B10/60 , H04J14/06 , H04B10/61
CPC分类号： H04B10/07953 , H04B10/60 , H04B10/614 , H04B10/6166 , H04J14/06
摘要： A polarization demultiplexing optical communication receiver is provided with a signal quality change imparting means which imparts a signal quality change to multiplexed two optical signals; and a signal quality monitoring means which compares signal qualities of the two optical signals with each other after the multiplexed two optical signals imparted with the signal quality change are subjected to polarization separation so as to specify the two optical signals based on a result of the comparison. This makes it possible to reduce transmission characteristics degradation of a polarization-multiplexed optical signal, and to implement transmission having high reliability.

8. 发明授权

US09692548B2 Techniques for blind equalization of high-order quadrature amplitude modulation signals 有权
公开(公告)号：US09692548B2
公开(公告)日：2017-06-27
申请号：US14661850
申请日：2015-03-18
申请人： ZTE Corporation
发明人： Zhensheng Jia , Hung-Chang Chien , Jianjun Yu
IPC分类号： H04J14/06 , H04L1/00 , H04B10/61
CPC分类号： H04J14/06 , H04B10/612 , H04B10/613 , H04B10/6165 , H04B10/6166 , H04L1/0036 , H04L1/0054
摘要： A blind equalization technique of high-order QAM signals is provided. A method implemented at a receiver-side in an optical communication network receives an optical signal and performs a two-step polarization tracking process on the received optical signal. Using another method, a polarization multiplexed optical transmission is received by a receiver and a polarization tracking process is performed by applying two different algorithms in parallel. One algorithm may be a decision directed least means square (DD-LMS) algorithm. Another algorithm may be a constant modulus algorithm (CMA).

9. 发明授权

US09544064B2 Electro-optical implementation of an optical spectrum inverter 有权
标题翻译：光学光学实现光谱逆变器
公开(公告)号：US09544064B2
公开(公告)日：2017-01-10
申请号：US14415028
申请日：2012-07-19
申请人： Bengt-Erik Olsson , Christina Larsson
发明人： Bengt-Erik Olsson , Christina Larsson
IPC分类号： H04B10/00 , H04B10/61 , H04B10/2531 , H04B10/255 , H04B10/2557 , H04J14/02 , H04J14/06 , H04L5/14 , H04B10/64
CPC分类号： H04B10/6166 , H04B10/2531 , H04B10/255 , H04B10/2557 , H04B10/6163 , H04B10/64 , H04J14/0202 , H04J14/06 , H04L5/14
摘要： The invention relates to an optical spectrum inverter, configured for counteracting phase distortion effects in an optical channel over a predefined frequency range, to an inverter node, configured for duplex operation in at least two wavelength channels, and to a method for counteracting phase distortion effects in an optical channel. The optical spectrum inverter comprises an optical receiver comprising a polarization diversity unit configured for polarization resolved detection, wherein the optical receiver is configured for receiving an optical input signal comprising a first wavelength span and for converting the optical input signal to an electrical signal, and an optical modulator connectable to the optical receiver and configured for modulating the electrical signal onto an optical signal, wherein the optical modulator comprises an optical filter which is configured for selecting a second wavelength span of the optical signal corresponding to an optical output side band of an inverted spectrum of the optical channel such that phase distortion effects are counteracted at least partly over the predefined frequency range. In this way, an optical spectrum inverter is provided which is simple and cost-effective to realize and allows higher optical power levels in conjunction with a higher capacity per optical channel and is also adapted for longer transmission distances.
摘要翻译：本发明涉及一种被配置为将预定频率范围内的光信道中的相位失真效应抵消到被配置为在至少两个波长信道中进行双工操作的逆变器节点的光谱逆变器以及用于抵消相位失真效应的方法在光通道中。所述光学频谱逆变器包括光接收器，该光接收器包括被配置用于偏振分辨检测的偏振分集单元，其中所述光接收器被配置为接收包括第一波长跨度的光输入信号并将所述光输入信号转换成电信号，光调制器，其可连接到光接收器并且被配置用于将电信号调制到光信号上，其中所述光调制器包括滤光器，所述滤光器被配置为选择对应于反转的光输出侧带的所述光信号的第二波长跨度光通道的频谱，使得相位失真效应至少部分地超过预定义的频率范围。以这种方式，提供了一种光谱逆变器，其实现并且允许更高的光功率水平与每个光通道的更高容量相结合，并且还适合于更长的传输距离。

10. 发明授权

US09281915B2 Optical polarization demultiplexing for a coherent-detection scheme 有权
标题翻译：用于相干检测方案的光偏振解复用
公开(公告)号：US09281915B2
公开(公告)日：2016-03-08
申请号：US13743677
申请日：2013-01-17
申请人： Noriaki Kaneda
发明人： Noriaki Kaneda
IPC分类号： H04J14/06 , H04B10/61
CPC分类号： H04J14/06 , H04B10/614 , H04B10/6166
摘要： An optical receiver having a plurality of optical IQ modulators arranged in a butterfly configuration and configured to operate as an optical polarization de-multiplexer. The optical receiver further has (i) an opto-electric circuit configured to apply optical homodyne detection to an optical input signal received by the optical receiver and (ii) a controller configured to generate one or more control signals for driving the IQ modulators of the plurality based on one or more electrical feedback signals received from the opto-electric circuit.
摘要翻译：一种具有多个光学IQ调制器的光接收器，其以蝶形配置布置并被配置为作为光偏振解复用器工作。光接收器还具有（i）光电回路，被配置为将光学零差检测应用于由光接收器接收的光输入信号，以及（ii）控制器，被配置为产生一个或多个控制信号以驱动IQ调制器基于从光电路接收的一个或多个电反馈信号来进行多个。

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