The EXFO FTBx-5255 is a high-performance optical spectrum analyzer designed for advanced spectral characterization and signal quality assessment across modern WDM networks. Built for field and lab applications, this versatile OSA module provides comprehensive testing for CWDM, DWDM and high-speed coherent networks in a single, portable solution. Optimized for both field and laboratory environments, the FTBx-5255 delivers industry-leading performance — including in-service polarization-multiplexed (Pol-Mux) OSNR measurement up to 400 Gbit/s — in a compact, rugged module compatible with EXFO’s portable platforms (FTB-2 Pro, FTB-4 Pro) and rack-mountable systems (LTB-8).

Features

Wavelength range : 1250 nm to 1650 nm

Resolution bandwidth (RBW) : 0.035 nm; <0.02 nm in high resolution mode

Analysis modes supported : WDM, EDFA, drift, spectral transmittance, DFB, FP

Channel spacing detection : 12.5 GHz to 200 GHz, CWDM compatible

Optical rejection ratio : ~45 dB @ 0.2 nm; ~50 dB @ 0.4 nm (typical)

Polarization dependent loss (PDL) : ±0.06 dB

Optical return loss (ORL) : ≥40 dB