公开(公告)号：EP0901244A2

公开(公告)日：1999-03-10

申请号：EP98306290.2

申请日：1998-08-06

申请人： NORTHERN TELECOM LIMITED

发明人： Garthe, Dietmar ,  Saunders, Ross Alexander ,  Robinson, Alan ,  O'Sullivan, Maurice ,  Hui, Rongqing

IPC分类号： H04B10/12 ,  H04J14/02 ,  H04B10/18

CPC分类号： H04B10/25137 ,  H04B10/255 ,  H04B10/2557

摘要： In a WDM transmission system carrying amplitude modulated traffic in which significant cross-phase modulation occurs, each of the individual channels is pre-chirped at the transmitter with replicas, or low-pass filtered replicas of the amplitude modulation applied to each of the other channels. Prechirping of each individual channel with a replica of the amplitude modulation applied to that channel may be used, additionally or alternatively, in order to provide compensation for self-phase modulation.

摘要翻译： 在携带幅度调制业务的WDM传输系统中，发生重要的交叉相位调制，各个信道在发射机处被预先啁啾，其中复制或低通滤波后的复制应用于每个其它信道 。 另外或替代地，可以使用应用于该信道的幅度调制的复制品对每个单独信道进行预编程，以便为自相位调制提供补偿。

公开(公告)号：EP0892512A2

公开(公告)日：1999-01-20

申请号：EP98305371.1

申请日：1998-07-06

申请人： NORTHERN TELECOM LIMITED

发明人： Davies, Fiona ,  Jolley, Nigel Edward ,  Jones, Kevan ,  Keys, Robert ,  O'Sullivan, Maurice

IPC分类号： H04B10/24

CPC分类号： H04B10/2972 ,  H04B10/2563

摘要： To support interleaving of optical channels and to provide sufficient isolation between such interleaved channels, a circulator (60-62) receives, on an optical fibre (16-18), a broadband signal containing a plurality of adjacent channels. The circulator selectively routes the broadband signal through a filter (64, 66) to isolate, on an individual basis, at least one desired channel. A filtered signal, corresponding to the at least one desired channel, is then output from the filter (64-66) and reflected back into the filter by a mirror (68-70) such that the at least one desired channel is subjected to a second filtering process that further improves isolation of the at least one desired channel. Following this second filtering process, the at least one desired channel is applied to the circulator (60-62) for re-inserting into the optical fibre (16-18), as illustrated in FIG. 6. To mitigate the effects of four-wave mixing in each bi-directional optical fibre, a channel assignment plan ensures that pairs of adjacent channels are assigned on a mutually exclusive basis to at least one of an up-link and a down-link direction.

摘要翻译： 为了支持光信道的交织并且在这种交织的信道之间提供足够的隔离，循环器（60-62）在光纤（16-18）上接收包含多个相邻信道的宽带信号。 循环器选择性地通过过滤器（64,66）路由宽带信号，以在个别的基础上隔离至少一个期望的信道。 然后从滤光器（64-66）输出对应于至少一个期望通道的滤波信号，并通过反射镜（68-70）反射回滤光器，使得至少一个期望的通道经受 第二过滤处理，其进一步改善所述至少一个期望信道的隔离。 在该第二滤波处理之后，将至少一个期望的信道施加到循环器（60-62）以重新插入到光纤（16-18）中，如图1所示。 为了减轻每个双向光纤中四波混频的影响，信道分配方案确保相邻信道对被分配给上行链路和下行链路中的至少一个 方向。