Abstract

Optical fibre distributed-feedback (DFB) lasers using UV-written fibre Bragg gratings on Er³⁺:Yb³⁺ fibres feature single-frequency operation, thus are a promising technology for applications in optical fibre communications[1]. Most fibre DFB lasers, however, actually operate in two orthogonal polarisations as a result of polarisation independence in the fibre DFB resonator, which is not desirable for these applications. In this paper, we report single-polarisation operations of fibre DFB lasers using injection locking techniques, which are similar to those used for polarisation switching in He-Ne lasers[2].

© 1998 IEEE