DESCRIPTION:

The VIAVI 4100 Series DWDM OTDR Module is a high-performance tunable C-band optical test module engineered for characterization, troubleshooting, and validation of active DWDM and hybrid CWDM/DWDM fibre infrastructures across telecom, metro, access, wireless, and transport network environments.

Designed for use with compatible VIAVI platforms including the T-BERD/MTS-2000, T-BERD/MTS-4000 V2, T-BERD/MTS-5800, OneAdvisor 800, and CellAdvisor 5G, the 4100 Series DWDM OTDR enables field technicians and transport engineers to perform complete end-to-end wavelength route validation and fibre fault isolation without disrupting live network traffic.

The platform supports:

• active DWDM network troubleshooting
• hybrid CWDM/DWDM validation
• metro and access network characterization
• mobile fronthaul fibre testing
• next-generation FTTH transport validation
• ROADM and MUX/DEMUX continuity testing
• in-service fibre diagnostics
• wavelength route qualification

The 4100 DWDM OTDR is engineered for:

• fibre fault isolation
• wavelength continuity verification
• live traffic troubleshooting
• optical route validation
• passive transport diagnostics
• optical attenuation analysis
• splice and connector characterization
• DWDM channel verification

The module incorporates a tunable C-band OTDR architecture operating across ITU-T G.694.1 wavelengths from channel C62 to C12 (1527.99 nm to 1567.95 nm), supporting 50 GHz, 100 GHz, and 200 GHz channel spacing for modern transport infrastructures.

Integrated Wavescan technology automatically identifies and validates DWDM channels and links, while SmartLink Mapper (SLM) provides icon-based graphical fibre topology interpretation for simplified field diagnostics and reduced OTDR trace interpretation errors.

Its in-service testing capability with instantaneous traffic detection allows technicians to safely troubleshoot live optical infrastructures through MUX/DEMUX and common test ports without interrupting operational services or damaging installed transceivers.

Technical Specifications

Supported Wavelength Range

• C-band tuning
• C62 to C12
• 1527.99 nm to 1567.95 nm
• ITU-T G.694.1 compliant

Channel Spacing

• 50 GHz
• 100 GHz
• 200 GHz

Dynamic Range

• 44 dB non-filtered
• 42.5 dB filtered

Pulse Width Range

• 10 ns to 20 µs

Event Dead Zone

• 1.5 m

Attenuation Dead Zone

• 4 m

Display Range

• 0.5 km to 260 km

Distance Resolution

• 1 cm

Sampling Resolution

• From 32 cm

Data Points

• Up to 256,000 data points

Attenuation Measurement

• Automatic mode
• Manual mode
• 2-point analysis
• 5-point analysis
• LSA analysis

Reflectance and ORL

• Automatic reflectance measurement
• Manual reflectance analysis
• ORL diagnostics support

Integrated Light Source

Operating Modes

• CW
• 270 Hz
• 330 Hz
• 1 kHz
• 2 kHz

Output Power

• 0 dBm

In-Service Capability

• Instantaneous traffic detection
• Live fibre testing support
• Active wavelength troubleshooting

Platform Compatibility

• T-BERD/MTS-2000
• T-BERD/MTS-4000 V2
• T-BERD/MTS-5800
• OneAdvisor 800
• CellAdvisor 5G
• FTH-9000

Platform Configuration Options

Available Module Variants

Software Options

Available software capability options include:

• Wavescan automatic channel identification
• SmartLink Mapper (SLM)
• SFP Protect functionality
• FastReport onboard reporting
• Pass/fail analysis workflows

Deployment Environments

The module supports deployment across:

• metro DWDM networks
• mobile fronthaul systems
• telecom transport infrastructures
• cable MSO optical networks
• next-generation FTTH systems
• enterprise transport environments

Standard Accessories

Typical supplied accessories include:

• SC/PC or SC/APC optical adapters
• Operational documentation
• Platform integration utilities
• Optical connector protection accessories

Optional Accessories

Available optional accessories include:

• Switchable optical adapters
• LC optical adapters
• FC optical adapters
• SLM software option
• Wavescan software license
• SFP Protect software option

Key Features

• Tunable C-band DWDM OTDR architecture
• ITU-T G.694.1 compliant wavelength support
• 50 GHz / 100 GHz / 200 GHz spacing support
• Live in-service fibre troubleshooting
• Automatic DWDM channel identification
• SmartLink Mapper topology visualization
• Integrated tunable laser source
• Metro and access network qualification
• Hybrid CWDM/DWDM network support
• ROADM and MUX/DEMUX validation
• 44 dB dynamic range capability
• Instantaneous traffic detection
• Portable modular field deployment
• Compatible with VIAVI T-BERD and OneAdvisor platforms
• Carrier-grade optical transport troubleshooting solution