@ARTICLE {283,
author={J. J. O.  Pires and R. F. Rocha},
doi={},
journal={IET Optoelectronics},
title={Carrier recovery and filtering in optical BPSK heterodyne systems disturbed by phase noise from external cavity semiconductor lasers},
year={1991},
month={August},
volume={138},
number={4},
pages={284-292},
ISSN={1751-8768}
}