The ILX Lightwave FOS-79800C is a precision fiber optic source module engineered for integration into ILX Lightwave 7900 Series mainframes. Built around a Distributed Feedback (DFB) laser, this module delivers stabilized, tunable output across defined wavelength bands for WDM, CWDM, and component characterization applications including EDFAs, SOAs, and broadband fiber optic systems.
## Technical Specifications
**Wavelength Performance**
• C-Band operation: 1527.98 nm to 1564.26 nm (FOS-79800C/315HB variant)
• Center wavelengths available at 1531.12 nm, 1531.90 nm, 1532.68 nm, 1533.46 nm, 1533.47 nm, 1535.82 nm, 1538.98 nm, and 1549.32 nm
• Tuning range: 1.7 nm with 0.001 nm resolution
• Wavelength stability: ±0.003 nm
**Power & Stability**
• Output power: 10.5 dBm (FOS-79800C/315HB)
• Power stability: ±0.003 dB (mainframe specification); <0.005 dB rms (FOS-79800E series)
• Dual-stage temperature control with low-noise laser current control for closed-loop constant power operation
**Modulation Capability**
• Synchronous modulation: 1–500 kHz
• Internal modulation: up to 500 kHz
• Optional processor-controlled mode: 100% depth, 50% duty cycle (FOS-79800F modules)
**Coherence & Linewidth Control**
• Adjustable linewidth: 30 MHz to 1 GHz
• SBS suppression and power stability enhancement
## Key Features
• Designed for ILX Lightwave 7900 Series mainframes (e.g., FOM-7900B)
• High-resolution attenuation for precise channel control
• Time-domain extinction testing capability via synchronous modulation
• Extended wavelength support across S, C, and L-bands (1475 nm to 1625 nm) in related FOS-79800E and FOS-79800F variants
• ITU grid and custom wavelength specifications available
## Typical Applications
• Wideband Code Division Multiple Access (WDM) testing
• Coarse WDM (CWDM) system characterization
• EDFA gain and noise figure measurement
• Semiconductor optical amplifier (SOA) evaluation
• Fiber optic component development and validation
## Compatibility & Integration
The FOS-79800C operates exclusively within ILX Lightwave 7900 Series mainframes, providing multi-wavelength test capability as part of a unified platform for telecommunications and fiber optic research applications.
