{"id":112739,"date":"2006-09-27T00:00:00","date_gmt":"2006-09-26T15:00:00","guid":{"rendered":"http:\/\/175.125.95.178\/research-achieve\/12739\/"},"modified":"2026-04-16T01:06:56","modified_gmt":"2026-04-15T16:06:56","slug":"12739","status":"publish","type":"research-achieve","link":"http:\/\/ee.presscat.kr\/en\/research-achieve\/12739\/","title":{"rendered":"Hyun Young Choi  won best student paper award of APOC 2006 conference"},"content":{"rendered":"<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\" align=\"left\">\n<tr>\n<td><img decoding=\"async\" src=\"\/userfiles\/image\/article\/APOC2006_BSPA-4.jpg\" alt=\"\" title=\"\"><\/td>\n<\/tr>\n<\/table>\n<p>&#8216;Performance of the OSNR monitoring technique based on improved polarization-nulling method&#8217;<\/p>\n<p>In this paper, we performed a comprehensive evaluation on the performances of this improved technique.  For this evaluation, we first implemented a highly nonlinear transmission link consisted of 640-km long standard single-mode fiber (SMF) and dispersion-compensating fiber (DCF) modules, and measured the OSNR of eight WDM channels for over 10 hours.  The results showed that the improved polarization-nulling technique could measure the OSNR with accuracy better than \u00b10.5 dB even when we intentionally increased the signal powers incident on the SMF and DCF to 0 dBm\/channel (to invoke large nonlinearities).  We also measured the performance of the improved technique in an ultra long-haul transmission link (~2000 km) by using a re-circulating loop.  Even after the transmission over such a long distance, there was no observable error in the measured OSNR.  The performance of the improved polarization-nulling technique was not affected by PMD as long as the total PMD was less than 60 ps. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>580<\/p>\n","protected":false},"featured_media":0,"template":"","research_category":[],"class_list":["post-112739","research-achieve","type-research-achieve","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"http:\/\/ee.presscat.kr\/en\/wp-json\/wp\/v2\/research-achieve\/112739","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/ee.presscat.kr\/en\/wp-json\/wp\/v2\/research-achieve"}],"about":[{"href":"http:\/\/ee.presscat.kr\/en\/wp-json\/wp\/v2\/types\/research-achieve"}],"wp:attachment":[{"href":"http:\/\/ee.presscat.kr\/en\/wp-json\/wp\/v2\/media?parent=112739"}],"wp:term":[{"taxonomy":"research_category","embeddable":true,"href":"http:\/\/ee.presscat.kr\/en\/wp-json\/wp\/v2\/research_category?post=112739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}