HP / Agilent 81662A (DFB) Lasers, such as High Channel Count DWDM System

The HP/Agilent 81662A is a distributed feedback (DFB) laser module that serves as a stable, single-frequency light source for high-channel count dense wavelength division multiplexing (DWDM) systems. It delivers +10 dBm optical output power with exceptional wavelength stability and narrow linewidth, making it essential for precision optical network testing where signal fidelity and wavelength accuracy are critical.

– Technical Specifications

• Laser Type: Distributed Feedback (DFB) laser module
• Wavelength Coverage: C-Band and L-Band
• Optical Output Power: +10 dBm (10 mW)
• Wavelength Stability: ±5 pm over 24 hours; ±2 pm repeatability; ±0.002 nm
• Power Stability: ±1 pm over 15 minutes; 0.003 dB
• Fine-Tuning Range: ±850 pm with ±10 pm repeatability (typical ±2 pm)
• Linewidth: Narrow spectral width with built-in coherence control for linewidth broadening
• Output Fiber: Polarization maintaining fiber (PMF), Panda 9/125 µm
• Output Connector: APC, ASC, and DIN 47265/4108 angled contact
• Power Attenuation: 0 dB to 6 dB in 0.1 dB steps
• Built-in Isolator: Ensures laser stability against return reflections
• Laser Classification: Class 1M per IEC 60825-1 (2001)

– Key Features

• Digital modulation at 270 Hz, 330 Hz, 1 kHz, 2 kHz, and 200 Hz to 10 kHz (user-selectable)
• Coherence control for linewidth broadening to mitigate stimulated Brillouin scattering
• GPIB and front-panel keypad control
• Integrated optical isolator for path-dependent reflection tolerance

– Typical Applications

• High channel count DWDM system testing and characterization
• Dense wavelength division multiplexed optical network validation
• Single-frequency source for coherent optical measurements

– Compatibility & Integration

Plug-in compatible with Agilent 8163A/B, 8166A/B, and 8164A/B Lightwave mainframes. Operates through standard Agilent optical interfaces; 81000xI Series optical interface connectors available separately.