With 250um-coating bare fiber without fiber connector. See specification at the last page of 1st pdf link below. See almost-same model datasheet at the 2nd pdf link below.These devices, the latest in NeoPhotonics’ line of MEMS based VOAs, are ultra compact devices that easily drop into any optical network application. All devices in the FVOA8000 family exhibit high speed operation, high dynamic range, high attenuation accuracy, low excess loss, low Polarization Dependent Loss (PDL) and high off-state extinction. The FVOA8000 is designed to operate for a single DWDM channel or a single wavelength at a time. The FVOA8100 exhibits all of the high performance of the FVOA8000 coupled with very low Wavelength Dependent Loss (WDL) across the entire C-band or L-band, making it ideal for applications where multiple DWDM channels must be attenuated simultaneously. The FVOA8100 exhibits the speed, low WDL, low PDL and high attenuation accuracy that make it ideal for use in optical amplifiers.