The JDS Uniphase 4136LM is a Last Mile OTDR module engineered for fiber optic network testing and characterization within the JDSU T-BERD/MTS-4000 platform. Designed for SMF 9/125 µm fiber, it delivers fault location, quick-link testing, and construction-mode trace analysis with fully automatic operation. The module supports in-service testing on PON deployments using ITU-T L41 maintenance wavelengths (1625 nm or 1650 nm), enabling measurements without disrupting active optical traffic.
## Technical Specifications
**Operating Wavelengths and Performance**
• Central wavelengths: 1310 nm ±20 nm, 1550 nm ±20 nm, 1625 nm ±10 nm, 1650 nm ±20 nm
• RMS dynamic range: 34 dB (1310 nm), 32 dB (1550 nm), 32 dB (1625 nm), 30 dB (1650 nm)
• Pulse width: 3 ns to 20 µs
• Event dead zone: 1 m at 1310 nm (±1.5 dB down from –27 dB reflective event peak)
• Attenuation dead zone: 4 m at 1310 nm (±0.5 dB from linear regression using –55 dB reflective event)
• Data acquisition: Up to 256,000 points
**Attenuation and Reflectance Measurements**
• Attenuation modes: Automatic, manual, 2-point, 5-point, and LSA
• Display range: 1.25 to 55 dB
• Reflectance accuracy: ±2 dB
• Display resolution: 0.01 dB
**Integrated Loss Test Set (LTS)**
• Laser source: Continuous wave or modulated operation
• Power meter (optional): –2 dBm to –50 dBm range
• Power meter wavelengths: 1310 nm, 1490 nm, 1550 nm, 1625 nm, 1650 nm
• Power measurement accuracy: ±0.5 dB
• Filtered wavelength rejection: 1310 nm, 1490 nm, 1550 nm options available
**Physical and Safety**
• Dimensions: 128 × 134 × 40 mm (W × H × D)
• Weight: 0.35 kg
• Laser safety class: Class 1 (21 CFR)
## Key Features
• One-button Fault Locator for fiber ends, total loss, and Optical Return Loss (ORL) determination
• Quick-link Test mode combining automatic acquisition with detailed trace analysis
• Construction Mode for high-level trace analysis during fiber commissioning
• In-service testing capability on active PON deployments without traffic interruption
• Filtered wavelength options to reject interfering signals on active lines
## Typical Applications
• Access and premises network construction and commissioning
• FTTx deployment and maintenance
• Short-haul fiber characterization
• In-service PON network testing and troubleshooting
## Compatibility & Integration
Module for JDSU T-BERD/MTS-4000 Multiple Services Test Platform. Compatible with SMF 9/125 µm fiber.
