The EXFO FTB-7403B is a 1550 nm OTDR module engineered for single-mode, long-haul optical fiber characterization and fault detection. This field-interchangeable module delivers precise fiber event identification, attenuation measurement, and distance-to-fault localization across extended cable routes. Designed for installation, maintenance, and troubleshooting of optical communication networks, the FTB-7403B integrates into EXFO’s portable test platforms to enable rapid field diagnostics with high repeatability.
## Technical Specifications
• **Wavelength:** 1550 nm
• **Module Type:** Single-mode (SM) Long-haul OTDR
• **Sampling Resolution:** Up to 4 cm for precise fault location
• **Sampling Points:** Up to 128,000
• **Loss Threshold:** 0.01 dB
• **Loss Resolution:** 0.001 dB
• **Linearity:** ± 0.03 dB/dB
• **Distance Uncertainty:** ± (0.75 + 0.001 % × distance + sampling resolution)
• **Measurement Time:** 5 seconds to 60 minutes (user-defined)
• **Connector:** EXFO Universal Interface (EUI), compatible with UPC and APC connectors
## Key Features
• Ultra-short event dead zones enable characterization of closely spaced fiber events
• Configurable pulse widths from 5 ns to 20,000 ns for range/resolution optimization
• Attenuation and event dead zone performance suitable for metro and long-haul network testing
• Loss threshold and resolution support detection of marginal splices and connectors
• Optional Visual Fault Locator (VFL) for rapid physical fault isolation
• Compact module design for field-portable operation
## Typical Applications
• New fiber installation commissioning and acceptance testing
• Preventive maintenance and network baseline characterization
• Fault isolation and event localization in single-mode fiber routes
• Loss budget verification and optical path anomaly diagnosis
• LAN/WAN and metro network troubleshooting with optional VFL
## Compatibility & Integration
The FTB-7403B integrates with EXFO’s rugged, portable test platforms including the FTB-400 Universal Test System, FTB-2/FTB-2 Pro, and FTB-4 Pro. Module field interchangeability enables configuration flexibility across platform families.
