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1.发明授权
公开(公告)号：EP2486679B1
公开(公告)日：2017-09-06
申请号：EP10821474.3
申请日：2010-10-06
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/2557 , H04B10/2563
CPC分类号： H04B10/2563 , H04B10/2557
摘要： An apparatus (104) mitigates cross-channel nonlinear distortion of an optical signal (138) carried on one of a plurality of wavelength channels (118) in a wavelength division multiplexed (WDM) transmission system (100). The apparatus includes a first optical receiver (126) which is arranged to detect a measure (134) of aggregate optical power of the plurality of wavelength channels. A nonlinear dispersion compensator includes means (144) for applying a phase modulation to the optical signal in proportion to the measure of aggregate optical power.
摘要翻译： 一种装置（104）减轻在波分复用（WDM）传输系统（100）中的多个波长信道（118）中的一个上承载的光信号（138）的交叉信道非线性失真。 该装置包括第一光接收器（126），该第一光接收器被安排来检测多个波长信道的聚合光功率的测量值（134）。 非线性色散补偿器包括用于与光信号的聚集光功率的测量成比例地对光信号施加相位调制的装置（144）。
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公开(公告)号：EP2656519A4
公开(公告)日：2015-01-07
申请号：EP11851343
申请日：2011-12-19
申请人： OFIDIUM PTY LTD
IPC分类号： H04B10/69 , H04B10/2507
CPC分类号： H04B10/616 , H04B10/2507 , H04B10/697 , H04B10/6971
摘要： An optical signal (116) is modulated with a transmitted electrical signal comprising an information-bearing component (122) and a pilot tone (120) having a predetermined frequency. Transmission of the signal results in distortion, including nonlinear optical transmission impairments. A method of receiving the signal includes detecting the optical signal to produce a received electrical signal (X) comprising a distorted variant of the transmitted electrical signal. The pilot tone is extracted from the received electrical signal using a filtering operation (308) having a predetermined characteristic, and a compensation signal determined based upon the extracted pilot tone. The compensation signal is applied to the received electrical signal (X) to produce a compensated signal (Y) having reduced distortion. The predetermined characteristic of the filtering operation (308) is represented by one or more parameters having values selected so as to substantially maximize a measure of quality of the compensated signal.
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3.发明公开MULTICHANNEL NONLINEARITY COMPENSATION IN AN OPTICAL COMMUNICATIONS LINK 有权KOMPENSATION VON MEHRKANALIGERNICHTLINEARITÄTBEI EINER OPTISCHEN KOMMUNIKATIONSVERBINDUNG
公开(公告)号：EP2486679A4
公开(公告)日：2014-07-30
申请号：EP10821474
申请日：2010-10-06
申请人： OFIDIUM PTY LTD
IPC分类号： H04B10/2557 , H04B10/2563
CPC分类号： H04B10/2563 , H04B10/2557
摘要： An apparatus (104) mitigates cross-channel nonlinear distortion of an optical signal (138) carried on one of a plurality of wavelength channels (118) in a wavelength division multiplexed (WDM) transmission system (100). The apparatus includes a first optical receiver (126) which is arranged to detect a measure (134) of aggregate optical power of the plurality of wavelength channels. A nonlinear dispersion compensator includes means (144) for applying a phase modulation to the optical signal in proportion to the measure of aggregate optical power.
摘要翻译： 一种装置（104）减轻在波分复用（WDM）传输系统（100）中承载在多个波长信道（118）之一上的光信号（138）的跨信道非线性失真。 该装置包括第一光接收器（126），其被布置成检测多个波长信道的总光功率的测量（134）。 非线性色散补偿器包括用于与聚合光功率的测量成比例地向光信号施加相位调制的装置（144）。
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公开(公告)号：EP1943755B1
公开(公告)日：2012-05-30
申请号：EP06790381.5
申请日：2006-10-12
申请人： Ofidium Pty Ltd
发明人： LOWERY, Arthur , ARMSTRONG, Jean
CPC分类号： H04N7/22 , H04B10/2513 , H04B10/5165 , H04B10/541 , H04B10/548 , H04B10/556 , H04B10/5561 , H04B10/5563 , H04B10/6971
摘要： A system (100) for transmitting digital information includes a transmitting apparatus (102) for generating an optical signal bearing digital information, a dispersive optical channel (104), and a receiving apparatus (110) for receiving the optical signal. The dispersive optical channel (104) is disposed to convey the optical signal from the transmitting apparatus (102) to the receiving apparatus (110). The transmitting apparatus includes an encoder (114) for encoding digital information into a series of blocks, each including a plurality of data symbols corresponding with one or more bits of digital information. A signal generator (118) generates a time-varying signal corresponding with each of said blocks. An optical transmitter (136) is arranged to apply the time-varying signal to an optical source (138) to produce an optical signal which includes an optical carrier and substantially only a single information bearing optical sideband in an optical frequency domain, the sideband corresponding with the time-varying signal. The receiving apparatus (110) includes an optical detector (146) for detecting the optical signal to produce a corresponding received time-varying electrical signal. The receiver further includes means (166) for generating a series of received data blocks from the time-varying electrical signal. An equaliser (168) performs an equalisation of received data symbols included in each data block to mitigate the effect of dispersion of the optical channel, thereby enabling the transmitted data symbols to be recovered.
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公开(公告)号：EP2115907A1
公开(公告)日：2009-11-11
申请号：EP07845413.9
申请日：2007-12-20
申请人： Ofidium Pty Ltd
CPC分类号： H04L27/2627 , H04B10/2543 , H04B10/6163 , H04B2210/254 , H04L25/03343 , H04L27/2096 , H04L27/2697 , H04L27/367 , H04L2025/03414
摘要： A method of transmitting information over a non-linear optical channel includes the step (152) of generating an information-bearing signal, preferably an OFDM signal, which includes a plurality of closely-spaced sub-carriers in the frequency domain. A time-varying phase modulation is determined (154), which is a first function, and preferably a linear function, of the transmitted optical power corresponding with the information-bearing signal. The information-bearing signal and the time-varying phase modulation are applied (156) to an optical source in order to generate a corresponding transmitted optical signal having substantially the stated transmitted optical power characteristic. The first function of transmitted optical power is selected so as to mitigate the effect of the non-linearity of the optical channel upon the transmitted optical signal. In alternative arrangements, a time-varying phase modulation, being a second function of optical power, is computed (162) and applied (164) to a signal received following transmission through a non-linear optical channel. The two alternative arrangements provide, respectively, for pre-compensation and post- compensation of non-linear propagation effects that may be carried out entirely within the electrical domain, for example using digital signal processing techniques.
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公开(公告)号：EP2656519B1
公开(公告)日：2018-08-01
申请号：EP11851343.1
申请日：2011-12-19
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/69 , H04B10/2507
CPC分类号： H04B10/616 , H04B10/2507 , H04B10/697 , H04B10/6971
摘要： An optical signal (116) is modulated with a transmitted electrical signal comprising an information-bearing component (122) and a pilot tone (120) having a predetermined frequency. Transmission of the signal results in distortion, including nonlinear optical transmission impairments. A method of receiving the signal includes detecting the optical signal to produce a received electrical signal (X) comprising a distorted variant of the transmitted electrical signal. The pilot tone is extracted from the received electrical signal using a filtering operation (308) having a predetermined characteristic, and a compensation signal determined based upon the extracted pilot tone. The compensation signal is applied to the received electrical signal (X) to produce a compensated signal (Y) having reduced distortion. The predetermined characteristic of the filtering operation (308) is represented by one or more parameters having values selected so as to substantially maximize a measure of quality of the compensated signal.
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公开(公告)号：EP2115906A4
公开(公告)日：2013-07-03
申请号：EP08700390
申请日：2008-01-29
申请人： OFIDIUM PTY LTD
发明人： ARMSTRONG JEAN
IPC分类号： H04B10/548 , H04B10/50 , H04B10/516
CPC分类号： H04B10/5053 , H04B10/50593 , H04B10/548 , H04B10/58
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公开(公告)号：EP2548351A2
公开(公告)日：2013-01-23
申请号：EP11755557.3
申请日：2011-03-17
申请人： Ofidium Pty Ltd
发明人： SHIEH, William
CPC分类号： H04B10/2507 , H04B10/2543 , H04L27/2614 , Y02D30/30
摘要： A method (1200) of transmitting digital information via a nonlinear optical channel (722), comprises receiving (1202) data (702) comprising at least a portion of the digital information. A plurality of frequency domain symbols is generated (1204) from the data, and each symbol is assigned to one of a predetermined plural number of frequency sub-bands. Each sub-band may be processed separately (1206) to reduce a peak-to-average power ratio (PAPR) of a transmitted optical signal. The optical signal (12) is then generated (1208) comprising the plural number of sub-bands, and transmitted via the nonlinear optical channel (722). The plural number of frequency sub-bands is predetermined so as to reduce nonlinear optical distortion of the optical signal within the nonlinear optical channel relative to a corresponding single frequency band signal. A corresponding information-receiving method, a transmitter apparatus and a receiver apparatus are also disclosed.
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公开(公告)号：EP1920544A4
公开(公告)日：2011-06-15
申请号：EP06774911
申请日：2006-09-01
申请人： OFIDIUM PTY LTD
发明人： LOWERY ARTHUR , ARMSTRONG JEAN
IPC分类号： H04B10/155 , H04B10/148 , H04B10/18
CPC分类号： H04B10/25133 , H04B10/548
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公开(公告)号：EP2274840A1
公开(公告)日：2011-01-19
申请号：EP09833917.9
申请日：2009-12-15
申请人： Ofidium Pty Ltd
CPC分类号： H04L5/0044 , H04B10/25137 , H04B10/548 , H04B2210/254 , H04L5/0007
摘要： A method of transmitting digital information over a dispersive optical channel (106) comprises encoding (152) the digital information into a series of data blocks, wherein each block comprises a plurality of substantially orthogonal frequency domain subcarriers, each data block is then divided (154) into at least two frequency bands, each band comprising a plurality of contiguous subcarriers. A frequency/time transformation is then performed (156), in order to form a corresponding plurality of transformed bands, each transformed band comprising a sequence of time domain data samples. A time delay is applied (158) to at least one of the transformed bands relative to at least one other of the transformed bands. The bands are then combined (160) to produce an electrical signal waveform embodying the digital information. Finally, an optical source is modulated (162) using the electrical signal waveform, to produce a corresponding optical signal for transmission over the dispersive optical channel (106). The invention enables a reduction in the duration of guard intervals that may need to be inserted into the transmitted data blocks, in order to avoid received signal degradation due to inter-symbol interference caused by dispersion in the optical channel (106). Transmission overheads may thereby be reduced, resulting in an improvement in transmission efficiency.
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