APPARATUS AND METHOD FOR MEASURING POLARIZATION DE

专利名称：APPARATUS AND METHOD FOR

MEASURING POLARIZATION DEPENDENTLOSS USING REPEATED HIGH SPEEDPOLARIZATION SCRAMBLING

发明人：KOH, Yeon-Wan,LEE, Bong-Wan,KIM, Jung-Won

申请号：EP02700829.1申请日：20020207公开号：EP1368678A1公开日：20031210

摘要：PURPOSE: An apparatus and a method for measuring a polarization dependentloss using a repetitive high speed polarization scrambling are provided, which reduces anopportunity of a disturb generation in a polarization of an input light by completing ameasurement within a fast time, and measures a polarization dependent loss with an allstate scanning method using a polarization modulator having a modulation speed aboveseveral kHz. CONSTITUTION: The apparatus for measuring a polarization dependent losscomprises a light source(302), and a polarizer(306) making a polarized light from a lightfrom the light source. A polarization scrambler(310) includes fiber birefringent

modulators comprising at least three cylindrical piezoelectric devices and optical fibers,and AC voltage sources applying an AC voltage of a frequency corresponding to aproduct of a fixed frequency(F) and an integer and being synchronized to one clock, andreceives the polarized light as an input light from the polarizer and outputs an outputlight having a polarization state repeated with a frequency F. A light detector detects an

output light of the polarization scramble after it passes through an object to bemeasured. An analog-digital converter is synchronized to clocks of the birefringentmodulators and provides an intensity of the passing light at every period. And a digitalsignal processor part suppresses noise followed at every measurement by averaging anintensity change waveform of the passing light at every period from the analog-digitalconverter.

申请人：Donam Systems Inc.

地址：2nd floor Sharkzone,590 Tanbang-dong,Seo-gu 302-223 Taejon KR

国籍：KR

代理机构：Skuhra, Udo, Dipl.-Ing.

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