title: Tunable single-mode Fabry-Perot laser diode using a built-in external cavity and its modulation characteristics.
abstract: A tunable single-mode laser is obtained by using a weakly coupled cavity structure involved in a coaxially packaged Fabry-Perot laser diode. The cleaved end facet of the coupling fiber becomes an optical reflector and forms an external cavity with a laser facet. The single-mode oscillation condition is controlled and stabilized by tuning the operating temperature. The tuning range is about 10 nm with the side-mode suppression ratio of more than 27 dB when the temperature changes from 11.5 degrees C to 25 degrees C. Direct modulation characteristics were investigated, and our results show that a shorter external cavity can bear deeper modulation depth.
authors.affiliation: Optical Internet Research Center, Information and Communications University, Yuseong-Gu, Daejeon, Korea. kumdong@icu.ac.kr
authors.forename: Yong Deok
authors.initials: YD
authors.lastname: Jeong
authors.forename: Yong Hyub
authors.initials: YH
authors.lastname: Won
authors.forename: Sang Ook
authors.initials: SO
authors.lastname: Choi
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Yoon