发明名称 |
Distortion measurement in optical communications systems |
摘要 |
<p>The distortion component of an optical signal received from an optical transmission system, such as an all-optical system, subject to noise and amplitude distortion components, can be evaluated by a method that utilises information derived from analysing the bit error ratio (BER) of the signal as a function of a movable threshold. The analysis is performed in high and low bit error ratio areas of the eye diagram used for data one/zero decision making. The intersections with the threshold axis (where BER=0.25) of extrapolations of the high and low bit error ratio values provide variables V1 and V2 which are divided (V1/V2) to obtain an estimate/prediction of the amplitude closure of the eye diagram resulting from amplitude distortion. The analysis is preferably carried out after Q conversion of the BER values. The method can also be extended to provide indications of Q, bit error ratio and optical signal-to-noise ratio within the signal. <IMAGE></p> |
申请公布号 |
EP1303062(A2) |
申请公布日期 |
2003.04.16 |
申请号 |
EP20020256966 |
申请日期 |
2002.10.08 |
申请人 |
NORTEL NETWORKS LIMITED |
发明人 |
ANSLOW, PETER J.;HEATH, RICHARD W. |
分类号 |
H04B10/02;H04B10/08;(IPC1-7):H04B10/08 |
主分类号 |
H04B10/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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