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专利名称：Optical signal monitoring method and
apparatus
发明人：Magri, Roberto,Matarazzo,
Emma,Ciaramella, Ernesto,Peracchi,Andrea,Corsini, Raffaele
申请号：EP11179303.0申请日：20110830公开号：EP2568627A1公开日：20130313
专利附图：
摘要：A method (10) of monitoring a differential group delay, DGD, of an optical
communications signal having a polarisation multiplexed modulation format. The methodcomprises: receiving a said signal and performing analogue to digital conversion of thesignal to generate a first digitised signal corresponding to a first polarisation of thesignal and to generate a second digitised signal corresponding to a second polarisationof the signal (12); applying a polarisation mode dispersion, PMD, compensation to each ofthe digitised signals (14); obtaining an indication of the channel transfer function of theoptical communications signal (16); determining a DGD in dependence on the indication ofthe channel transfer function (18); determining a delay between the PMD compensatedfirst digitised signal and the PMD compensated second digitised signal (20); subtractingthe delay from the DGD to obtain a corrected DGD (22); and generating and transmittinga monitoring signal comprising an indication of the corrected DGD (24).
申请人：Telefonaktiebolaget LM Ericsson (PUBL)
地址：Telefonvagen 30 1 83 Stockholm SE
国籍：SE
代理机构：Barrett, Peter Andrew John
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