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This paper evaluates the performance of dense wavelength division multiplexed (DWDM) system with PMD at 80\u2009Gb\/s in the presence of Kerr\u2010nonlinear effects. Orthogonally modulated signals have been investigated and compared for tolerance against PMD in a DWDM transmission system with direct detection receivers. The optimized combinations of orthogonal polarization (OP) with carrier\u2010suppressed return\u2010to\u2010zero (CSRZ) and CSRZ differential\u2010phase\u2010shift\u2010keying signals are shown to improve PMD tolerance over high bit rates and long transmission lengths. Improved performance greater than 4\u2009dB is observed for CSRZ modulated signal with OP because of less channel cross talk and reduced power transfer between adjacent bits over different PMD values. The numerical results demonstrate that our proposed orthogonally modulated signals perform better with lesser complex direct detection receivers. Copyright \u00a9 2015 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/dac.3076","type":"journal-article","created":{"date-parts":[[2015,10,5]],"date-time":"2015-10-05T10:16:53Z","timestamp":1444040213000},"page":"1084-1090","source":"Crossref","is-referenced-by-count":11,"title":["Comparative investigations of DWDM transmission system with PMD for different orthogonally modulated signals at 80\u2009Gb\/s"],"prefix":"10.1002","volume":"29","author":[{"given":"Richa","family":"Bhatia","sequence":"first","affiliation":[{"name":"Department of Electronics and Communication Engineering Ambedkar Institute of Advanced Communication Technologies and Research Delhi India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ajay Kumar","family":"Sharma","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering National Institute of Technology Delhi India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jyoti","family":"Saxena","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communication Engineering Giani Zail Singh PTU Campus Bathinda Punjab India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2015,10,5]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/JLT.2006.885260"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSTQE.2006.876185"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aeue.2006.12.006"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/LPT.2004.839766"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/LPT.2008.918216"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1109\/JLT.2009.2022850"},{"key":"e_1_2_6_8_1","first-page":"384","article-title":"A direct detection method for DPSK\/DQPSK signals","author":"Duan G","year":"2010","journal-title":"IET International Conference AIAI"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1109\/50.701396"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/0471221147"},{"volume-title":"Fiber\u2010optic Communications Technology, Eighth Impression","year":"2011","author":"Mynbaev DK","key":"e_1_2_6_11_1"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1109\/2944.847767"},{"key":"e_1_2_6_13_1","doi-asserted-by":"crossref","unstructured":"WagnerRE ElrefaieF.Polarization dispersion limitations in lightwave systems. 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