Exfo FTB-5240 1250nm Portable Optical Spectrum Analyzer

The Exfo FTB-5240 1250nm Portable Optical Spectrum Analyzer delivers lab-grade spectral analysis in a field-deployable package. Built for telecommunications networks employing DWDM technology, it performs component and system testing across manufacturing, installation, commissioning, and maintenance workflows. The instrument combines a rugged magnesium shell with splash resistance and battery operation, enabling measurements in demanding environments without sacrificing measurement fidelity.

Technical Specifications

Wavelength & Resolution

• Wavelength range: 1250 nm to 1650 nm


• Resolution bandwidth (FWHM): 0.065 nm (FTB-5240, FTB-5240S/BP); 0.033 nm (FTB-5240B)


• Wavelength accuracy: ±0.05 nm (FTB-5240B, FTB-5240S/BP); ±30 pm internal calibration or ±15 pm external calibration in C+L band (FTB-5240B) Power Measurement


• Measurable input power range: +18 dBm to −75 dBm per channel


• Maximum input power: +23 dBm per channel (FTB-5240S-HPW); +29 dBm total safe power


• Absolute power uncertainty: ±0.5 dB


• Power repeatability (2σ): ±0.05 dB


• Dynamic range: 93 dB Optical Rejection


• ORR (FTB-5240): 40 dBc at 0.2 nm; 50 dBc at 0.4 nm from peak


• ORR (FTB-5240B): 40 dBc at 0.1 nm from peak


• ORR (FTB-5240S/BP): 50 dBc at 0.2 nm; 55 dBc at 0.4 nm Channel Support


• Standard spacing: 25 GHz, 50 GHz, 100 GHz


• CWDM capable; 12.5 GHz minimum spacing (FTB-5240BP)

Key Features

• Test modes: Normal, In-Band, Drift (FTB-5240)


• DFB laser, EDFA, Fabry-Perot laser, and spectral transmittance testing


• In-Band OSNR measurement via polarization-resolved method (FTB-5240S-P, FTB-5240BP)


• Trace comparison and spectral analysis


• Monitor output port for single-channel external analysis


• FC/UPC connectors


• Operating temperature: 23 °C ± 2 °C for rated accuracy

Compatibility & Integration Houses within EXFO FTB-400 or FTB-300 Universal Test Systems. FTB-5240S also compatible with FTB-200 Compact Platform. Local control via ToolBox software; remote control via GPIB, RS-232, or Ethernet TCP/IP with SCPI commands or LabVIEW drivers. Supports external printer, modem, mouse, keyboard, and monitor peripherals.