The ILX Lightwave FOS-79800B is a precision DFB laser source module for fiber optic testing and WDM system characterization. It operates as a plug-in component within the FOM-7900B Fiber Optic System Mainframe, delivering stable, wavelength-specific optical output across the C and L bands. The module supports independent control via front-panel menu or remote command through RS-232 and GPIB (IEEE-488.2) interfaces, enabling multi-wavelength measurement campaigns and component validation in production and laboratory environments.
## Technical Specifications
• **Emitter Type:** DFB laser diode
• **Wavelength:** Module-dependent; ITU grid points available (examples: 1530.3 nm, 1537.4 nm; extended range 1475–1625 nm for FOS-79800F variants)
• **Output Power:** 10.0 dBm typical (FOS-79800B/315B); minimum 10 dBm (FOS-79800D/315X1); minimum 13 dBm (FOS-79800D/315X2); 9–20 mW calibrated (FOS-79800E)
• **Short-Term Power Stability:** ±0.005 dB (rms) at constant ambient within ±0.1°C
• **Long-Term Power Stability:** ±0.003 dB over 15 minutes at constant ambient within ±1°C
• **Wavelength Stability:** ±3 pm / 90 days post-calibration (FOS-79800 series); ±0.003 nm (FOS-79800E); ±25 pm / 90 days or ±50 pm / one year (FOS-79800F)
• **Linewidth:** 30 MHz nominal; tunable to 1 GHz via coherence control for SBS suppression
• **Attenuation Accuracy:** ±0.1 dB high-resolution control
## Key Features
• Processor-controlled modulation at 100% depth, 50% duty cycle
• Synchronous modulation capability spanning 1–500 kHz across all active modules
• Mainframe trigger support for synchronized multi-module operation
• Wavelength-stabilized output suitable for precision component and system characterization
## Typical Applications
• WDM component and system testing
• Optical fiber characterization
• Multi-wavelength performance validation
• Wavelength-dependent loss and dispersion measurement
## Compatibility & Integration
Designed exclusively for the FOM-7900B Fiber Optic System Mainframe. Part of the fourth-generation FOS-79800 series platform. **Status: Obsolete.** Manufacturer support, calibration, and repair services are no longer available from ILX Lightwave.
