High-power tunable external cavity laser source. Its narrow spectral linewidth makes it suitable for dense WDM systems. mechanical tuning wavelength by scew. If set 10dBm, we get tested result in our lab : >9dBm over 1460-1600nmnm. Some modules can be 10dBm, and most of modules are also good at 1440-1460nm, 1600-1615nm. It will be more stable at lower output and not very far from 1540nm. 3 module samples working stable >5 hrs. FC/APC fiber connectors. SMF is verified by fiber scope.Note for the the plug-in module: Wavelength is not shown on display of instrument. The instrument does not come with turning knob, so we can only adjust wavelength by our screw driver. We monitor wavelength change by wavelength meter. The turning resolution would be around 0.1nm very approximately. If we turn the screw driver very carefully, we would get much lower resolution. Probably you can make a customized knob, then you will get much better resolution.