Virtual Journal of Laser

Publication year: 2010
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 8 February 2010
José A.P., Morgado , Carlos A.F., Fernandes , José B.M., Boavida
This paper shows that a suitable design of a single phase-shift (1PS) distributed coupling coefficient (DCC) distributed feedback (DFB) laser structure can strongly improve both the normalized mode selectivity and the flatness of the electrical field profile of DFB lasers—usually quantified by a flatness parameter order to ensure the required criteria for single longitudinal mode operation ( and ) through an extended range of biasing current injection (I). It is shown that a symmetric longitudinal laser cavity should be used in order to accomplish the requirements imposed by the modern optical communication systems. Photon and carrier rate equations...