Fluke networks sfsinglemodesource cable tester fluke networks sfsinglemodesource p the fluke networks sfsinglemodesource is a simplifiber pro single mode 1310 1550 laser light source the single mode 1310 1550 is an optional single mode laser source that has been designed to work in tandem with the fluke networks simplifiber pro optical power meter in order to provide users with the ability to test a variety of fibre networks p p this device has the benefit of only utilising one sc port