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    RECEPTION OF SIGNALS TRANSMITTED OVER A DISPERSIVE OPTICAL CHANNEL
    2.
    发明公开
    RECEPTION OF SIGNALS TRANSMITTED OVER A DISPERSIVE OPTICAL CHANNEL 审中-公开
    色散光学信道传输SIGNALS接收

    公开(公告)号：EP2122866A1

    公开(公告)日：2009-11-25

    申请号：EP08714319.4

    申请日：2008-02-15

    申请人： Ofidium Pty Ltd

    发明人： ARMSTRONG, Jean ,  LOWERY, Arthur

    IPC分类号： H04B10/158

    CPC分类号： H04B10/67

    摘要： A receiver for recovering transmitted information carried by a received optical signal that has been affected by dispersion includes an optical splitter having an input port arranged to receive the received optical signal, and a plurality of output ports. A proportion of optical power at the input port is transmitted to each of the output ports. A plurality of optical detectors is operably connected to respective output ports of the optical splitter, for generating a corresponding plurality of electrical signals. Optical phase shifters are disposed between the output ports of the optical splitter and respective optical detectors. As a result, each optical phase shifter applies a frequency dependent phase shift to an optical signal passing therethrough. An electronic processor includes analog and/or digital electronic components configured to combine two or more of the plurality of electrical signals, or information recovered separately therefrom, in order to provide improved accuracy or reliability of information recovery as compared with detecting and processing only the received optical signal. The receiver is advantageously able to mitigate the effects of frequency-dependent fading which may occur in intensity modulation/direct detection optical transmission systems due to dispersion in optical transmission paths.

    METHODS AND APPARATUS FOR OPTICAL TRANSMISSION OF DIGITAL SIGNALS
    3.
    发明授权
    METHODS AND APPARATUS FOR OPTICAL TRANSMISSION OF DIGITAL SIGNALS 有权
    方法和数字信号的光传送装置

    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

    IPC分类号： H04B10/18 ,  H04N7/22

    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.

    METHOD AND APPARATUS FOR RECEPTION OF OPTICAL SIGNALS
    4.
    发明公开
    METHOD AND APPARATUS FOR RECEPTION OF OPTICAL SIGNALS 有权
    方法和装置用于接收光信号

    公开(公告)号：EP2260593A1

    公开(公告)日：2010-12-15

    申请号：EP09712363.2

    申请日：2009-02-20

    申请人： Ofidium Pty Ltd

    发明人： SCHMIDT, Brendon James ,  LOWERY, Arthur James ,  ARMSTRONG, Jean

    IPC分类号： H04B10/148

    CPC分类号： H04B10/64 ,  H04B10/61 ,  H04B10/614 ,  H04B10/6151

    摘要： An apparatus and method are provided for receiving an optical signal having an optical carrier component and at least one information-bearing optical sideband. In general, an optical filter arrangement (110) is used to separate the optical carrier component from the information-bearing optical sideband. First and second optical splitters (126, 128) divide the optical power in the optical carrier and the optical sideband, respectively, into corresponding sub-components. The sub-components of the optical carrier have substantially orthogonal polarisation states, which is an optional characteristic of the sideband sub-components. First and second optical coupling devices (142, 144) respectively each combine one of the optical carrier sub-components with a corresponding one of the optical sideband sub-components. Optical detectors (158, 160) detect the outputs of the combiners (142, 144). The arrangement is able to achieve a number of the benefits of coherent optical heterodyne receivers, particularly when used in combination with advanced coding and modulation methods, while avoiding the need, and associated complexity, of providing an optical oscillator at the receiver.

    METHODS AND APPARATUS FOR GENERATION AND TRANSMISSION OF OPTICAL SIGNALS
    7.
    发明公开
    METHODS AND APPARATUS FOR GENERATION AND TRANSMISSION OF OPTICAL SIGNALS 有权
    方法和装置产生和传输光信号

    公开(公告)号：EP2115906A1

    公开(公告)日：2009-11-11

    申请号：EP08700390.1

    申请日：2008-01-29

    申请人： Ofidium Pty Ltd

    发明人： ARMSTRONG, Jean

    IPC分类号： H04B10/00

    CPC分类号： H04B10/5053 ,  H04B10/50593 ,  H04B10/548 ,  H04B10/58

    摘要： Methods and apparatus (100) for composing, generating and transmitting information-bearing optical signals are provided. An information-bearing electrical signal is composed (108) having desirable spectral properties, preferably configured to ensure that undesired interference between electrical spectral components generated in a square-law direct detection process (120) at a corresponding optical receiver (104) is substantially avoided. Predistortion (110) is advantageously applied to transmitted signals, in order to account for a nonlinear relationship arising in a modulation process (114) between electrical signal amplitude and corresponding optical field amplitude. Orthogonal frequency division multiplexing (OFDM) techniques may be applied to composed signals having the desired characteristics, and additionally may facilitate the application of frequency domain equalisation (128) in order to mitigate transmission impairments, including dispersion. Improvements in received signal quality, and/or transmission distance, may thereby be achieved, along with simplification of receiver configuration and operation.