The HP/Agilent 81655A is a single Fabry-Perot laser source module delivering continuous-wave optical power at 1310 nm for precision optical testing and component characterization. Built on InGaAsP technology, this plug-in module outputs greater than 13 dBm (20 mW) with exceptional power stability of ±0.03 dB over 24 hours, making it ideal for demanding measurement applications requiring long-term consistency.
## Technical Specifications
• **Laser Type:** Fabry-Perot laser diode, InGaAsP
• **Wavelength:** 1310 nm (±15 nm)
• **Output Power:** >13 dBm (20 mW)
• **Maximum CW Output Power:** 52 mW
• **Power Stability:** ±0.03 dB over 24 hours
• **Operation Mode:** Continuous wave (CW)
• **Beam Waist Diameter:** 9 µm
• **Numerical Aperture:** 0.1
• **Laser Class:** Class 1M (IEC 60825-1:2001)
• **Warm-up Time:** 60 minutes
• **Operating Temperature:** 0–45 °C
• **Weight:** 0.5 kg
## Key Features
• Insensitive to back reflections—no external isolator required
• Internal digital modulation capability for automated test sequences
• SCPI command support for integration with automated measurement systems
• Compact plug-in module design
## Typical Applications
• Insertion loss measurements
• Optical return loss (ORL) measurements
• Polarization-dependent loss (PDL) characterization of broadband components and fiber
## Compatibility & Integration
The 81655A integrates directly into Agilent 8163A, 8164A, and 8166A lightwave measurement mainframes, enabling rapid deployment in existing test laboratories without additional external optics or signal conditioning.
