Agilent/Keysight 81662A,Optical Power Head

The Agilent/Keysight 81662A is a low-power DFB laser source module engineered for optical amplifier and DWDM system testing. It delivers stable, precision-controlled output suitable for demanding optical measurement applications requiring wavelength and power stability over extended periods.

Technical Specifications

• Maximum output power: +10 dBm (10 mW)


• Output attenuation range: 0 dB to 6 dB in 0.1 dB steps


• Output fiber: Panda PMF 9/125 µm (Polarization Maintaining Fiber)


• Output connectors: Compatible with APC, ASC, and DIN 47265/4108 Stability Performance


• CW power stability (15 min): ±0.005 dB typical


• CW power stability (24 h): ±0.03 dB typical


• Wavelength stability (24 h): ±5 pm typical Modulation


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


• Output pulse shape: 50% duty cycle


• Internal coherence control for linewidth broadening available Laser Classification


• Class 1 per IEC 60825-1 (2001); Class 1M per IEC 60825-1 (2007)


• Complies with 21 CFR 1040.10 except per Laser Notice No. 50, dated 2007-June-24

Key Features

• Distributed Feedback (DFB) laser source for low-noise operation


• Tight power and wavelength stability suitable for precision system characterization


• Polarization-maintaining output fiber minimizes depolarization effects


• Multiple modulation frequencies enable flexible test protocols


• Variable output attenuation from 0 to 6 dB

Typical Applications

• Optical amplifier performance validation


• DWDM system testing and channel characterization


• Laser linewidth and coherence measurements


• Optical component and subsystem evaluation

Compatibility & Integration The 81662A operates within the Agilent Lightwave Solution platform and fits into mainframes including 8163A/B, 8166A/B, and 8164A/B. It integrates with interface modules such as the N7749C, 81618A, and 81619A for expanded measurement capabilities.