ILX Lightwave 7900B with FOS79800D Maninfram + ModuLe

The ILX Lightwave 7900B mainframe equipped with FOS79800D WDM DFB fiber optic source modules delivers laser characterization for multi-channel optical testing. This modular system accommodates up to 8 plug-in modules per mainframe, with the ability to link multiple units for up to 200 total channels. The FOS79800D series provides precise wavelength and power control across C-band and L-band spectra, making it suitable for WDM component validation, laser source characterization, and production test environments.

Technical Specifications

• Wavelength range: 1528 nm to 1610 nm (ITU grid or custom); C-band (1527.99–1564.26 nm) and L-band (1564.27–1610.06 nm); 1310 nm available


• Output power: 10 dBm minimum (315X1 series); 13 dBm minimum (315X2 series)


• Wavelength stability: ±3 pm with ±0.003 dB power stability


• Tuning range: ±0.85 nm (1.7 nm total per channel); 0.001 nm resolution


• Spectral width: 40 dB (>45 dB typical)


• Signal-to-background ratio: >30 dB


• Optical isolation: >30 dB


• Relative intensity noise: -145 dB/Hz


• Optical interface: FC/APC Modulation


• Internal synchronous modulation: up to 500 kHz


• Modulation frequency range: 1–500 kHz


• Modulation depth: 100%; duty cycle 50%


• Transition time: 30 ms (off to on); 10 ms (on to off)


• Repeatability: ±0.01 dB


• Lifetime: >10 million cycles

Key Features

• Multi-channel laser source integration with scalable architecture


• Precise current and temperature management for laser diode control


• Tunable DFB lasers across extended C and L bands


• High spectral purity and low noise floor for component-level testing


• Modular plug-in design supports mixed module configurations

Typical Applications

• WDM system and component test and validation


• Laser diode characterization in R&D and production


• Multi-wavelength optical source deployment


• Fiber optic component performance verification

Compatibility & Integration The FOS79800D modules integrate into the FOM-7900B mainframe. Multiple mainframes can be linked for extended channel capacity.