<?xml version="1.0" encoding="UTF-8"?> <article key="pdf/10000029" mdate="2014-11-03 00:00:00"> <author>R. Z. R. R. Rosdin and N. M. Ali and S. W. Harun and H. Arof</author> <title>Bright&amp;ndash;Dark Pulses in Nonlinear Polarisation Rotation Based ErbiumDoped Fiber Laser</title> <pages>1461 - 1464</pages> <year>2014</year> <volume>8</volume> <number>12</number> <journal>International Journal of Physical and Mathematical Sciences</journal> <ee>https://publications.waset.org/pdf/10000029</ee> <url>https://publications.waset.org/vol/96</url> <publisher>World Academy of Science, Engineering and Technology</publisher> <abstract>We have experimentally demonstrated brightdark pulses in a nonlinear polarization rotation (NPR) based modelocked Erbiumdoped fiber laser (EDFL) with a long cavity configuration. Bright&amp;amp;ndash;dark pulses could be achieved when the laser works in the passively modelocking regime and the net group velocity dispersion is quite anomalous. The EDFL starts to generate a bright pulse train with degenerated dark pulse at the modelocking threshold pump power of 35.09 mW by manipulating the polarization states of the laser oscillation modes using a polarization controller (PC). A split bright&amp;amp;ndash;dark pulse is generated when further increasing the pump power up to 37.95 mW. Stable bright pulses with no obvious evidence of a dark pulse can also be generated when further adjusting PC and increasing the pump power up to 52.19 mW. At higher pump power of 54.96 mW, a new form of brightdark pulse emission was successfully identified with the repetition rate of 29 kHz. The bright and dark pulses have a duration of 795.5 ns and 640 ns, respectively. </abstract> <index>Open Science Index 96, 2014</index> </article>