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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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公开(公告)号：EP2220795A1
公开(公告)日：2010-08-25
申请号：EP08800159.9
申请日：2008-10-15
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/148
CPC分类号： H04B10/60
摘要： A method and apparatus for receiving digital information transmitted via an optical signal over an optical channel wherein the optical signal includes an optical carrier (402) and at least one information-bearing optical sideband (404) in the optical frequency domain. The transmitted optical power is distributed between the optical carrier (402) and the optical side band (404). The received optical signal is processed in order to increase the received power in the optical carrier (402) relative to the power in the optical side-band (404). The processed optical signal is detected in order to produce a corresponding electrical signal. The electrical signal is then processed in order to recover the digital information. Advantageously, increasing the optical carrier power relative to the power in the information-bearing sideband results in improved quality of the detected electrical signal, enabling an improved power budget to be achieved, which in turn allows for longer transmission distances, increased transmitted information rates, and/or improved transmission error performance as compared with conventional direct detection optical transmission systems.
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公开(公告)号：EP2356761B1
公开(公告)日：2018-03-28
申请号：EP09818674.5
申请日：2009-02-27
申请人： Ofidium Pty Ltd
IPC分类号： H04J14/00 , H04L27/32 , H04B10/2575 , H04L27/20 , H04L27/22
CPC分类号： H04L27/223 , H04B10/25759 , H04L27/2096
摘要： A method of generating an information-bearing optical signal (614) from input digital information (602) includes generating (604, 606) an information-bearing electrical signal comprising an in-phase (I) component and a quadrature (Q) component. Each of the components has a predetermined baseband bandwidth requirement (B). The I and Q signal components are combined (610) with corresponding I and Q components of a radio frequency (RF) carrier (608). The carrier has a central frequency greater than the signal bandwidth requirement (B). An optical source is modulated (612) with the combined I and Q signal and carrier components, in order to produce a modulated optical signal (614) which comprises an optical carrier corresponding with the RF carrier, and substantially only a single information-bearing optical sideband in an optical frequency domain, corresponding with the information-bearing electrical signals. Transmitters implementing the method are also disclosed.
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公开(公告)号：EP2274840B1
公开(公告)日：2013-01-23
申请号：EP09833917.9
申请日：2009-12-15
申请人： Ofidium Pty Ltd
IPC分类号： H04L27/18 , H04B10/516 , H04B10/2513 , H04L27/26
CPC分类号： H04L5/0044 , H04B10/25137 , H04B10/548 , H04B2210/254 , H04L5/0007
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公开(公告)号：EP2356761A1
公开(公告)日：2011-08-17
申请号：EP09818674.5
申请日：2009-02-27
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/155 , H04J14/00 , H04L27/32
CPC分类号： H04L27/223 , H04B10/25759 , H04L27/2096
摘要： A method of generating an information-bearing optical signal (614) from input digital information (602) includes generating (604, 606) an information-bearing electrical signal comprising an in-phase (I) component and a quadrature (Q) component. Each of the components has a predetermined baseband bandwidth requirement (B). The I and Q signal components are combined (610) with corresponding I and Q components of a radio frequency (RF) carrier (608). The carrier has a central frequency greater than the signal bandwidth requirement (B). An optical source is modulated (612) with the combined I and Q signal and carrier components, in order to produce a modulated optical signal (614) which comprises an optical carrier corresponding with the RF carrier, and substantially only a single information-bearing optical sideband in an optical frequency domain, corresponding with the information-bearing electrical signals. Transmitters implementing the method are also disclosed.
摘要翻译： 从输入数字信息（602）生成信息承载光信号（614）的方法包括生成（604,606）包括同相（I）分量和正交（Q）分量的信息承载电信号。 每个组件具有预定的基带带宽要求（B）。 I和Q信号分量与射频（RF）载波（608）的相应I和Q分量组合（610）。 载波的中心频率大于信号带宽要求（B）。 利用组合的I和Q信号以及载波分量对光源进行调制（612），以便产生包括与RF载波相对应的光载波的调制光信号（614），并且基本上只有单个信息承载光学 在光频域中与带信息的电信号相对应的边带。 还公开了实现该方法的发送器。
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