Agilent/Keysight 81652A,Tunable Laser Source

The Agilent/Keysight 81652A is an InGaAsP Fabry-Perot laser source module designed for optical component characterization within the Agilent Lightwave Solution Platform. Operating at 1550 nm ±15 nm with spectral bandwidth below 4.5 nm (rms), this module delivers output power exceeding 0 dBm into single-mode 9/125 µm fiber. The 81652A integrates with optical power meter modules for insertion loss, optical return loss, and PDL measurements, offering the precision and stability required for both short and long-term test applications.

Technical Specifications

• Laser Type: InGaAsP Fabry-Perot


• Center Wavelength: 1550 nm ±15 nm


• Spectral Bandwidth (rms): 0 dBm (1 mW)


• CW Power Stability: ±0.03 dB over 24 hours; <±0.005 dB over 15 minutes


• Output Attenuation: 0 dB to 6 dB in 0.1 dB steps


• Fiber Type: Single-Mode 9/125 µm


• Dimensions: 2.8 × 1.3 × 13.2 inches


• Weight: 5 lbs

Key Features

• Internal digital modulation with selectable frequencies: 270 Hz, 330 Hz, 1 kHz, 2 kHz, and free selection from 200 Hz to 10 kHz


• Pulse-shaped output signals with 50% duty cycle


• Insensitive to back reflections


• Fine-resolution power control via calibrated attenuator


• Exceptional short-term and long-term power stability

Typical Applications

• Component insertion loss characterization


• Optical return loss measurement


• Polarization-dependent loss (PDL) analysis


• Wavelength-dependent testing at 1550 nm


• Modulated optical signal generation for system validation

Compatibility & Integration The 81652A mounts into the bottom slot of the 8164A mainframe and integrates with Keysight optical power meter modules and complementary laser source modules. Standard optical interface connectors (81000xI Series sold separately) enable straightforward integration into test setups. Control and modulation interfaces are native to the Agilent modular laser source architecture.