Agilent/Keysight 81606A Tunable Laser Module (1240–1380 nm)

The Keysight 81606A is a tunable laser module engineered for the 8164B lightwave measurement system, delivering precision wavelength control across the 1240–1380 nm band. It has sub-picometer tuning repeatability, exceptional spectral purity, and bidirectional sweep speeds up to 200 nm/s - 40 times faster than predecessor models. The module excels in component characterization, system validation, and optical network testing, where absolute accuracy and dynamic range are critical.

Technical Specifications

• Wavelength Range: 1240–1380 nm (standard configuration; additional bands available via options)


• Sweep Speed: Up to 200 nm/s bidirectional


• Maximum Output Power: > +13 dBm peak (Option 113); > +12 dBm peak (other configurations); user-adjustable to 0 dBm minimum


• Absolute Wavelength Accuracy: ±1.5 pm typical


• Wavelength Repeatability: ±1 pm typical during two-way sweeps to 200 nm/s


• Spectral Width: 50 dB


• Signal-to-Spontaneous Emission Ratio: ≥ 80 dB/nm typical


• Tuning Repeatability: Sub-picometer


• Optical Connector: FC/PC (angled contact option available)


• Electrical Connectors: Two BNC connectors (input/output); maximum ±6 V per connector

Key Features

• 4-fold improvement in absolute wavelength accuracy versus earlier generations


• 15 dB greater dynamic range compared to predecessor models


• 10 dB reduction in source spontaneous emission


• Bidirectional sweep capability with sub-picometer repeatability across full tuning range


• Compact module design fits into the bottom back-loadable slot of the 8164B mainframe

Typical Applications

• Optical component characterization and validation


• Wavelength-dependent system testing in telecommunications and networking


• Photonic research requiring high spectral purity and tuning precision


• Automated wavelength sweeping and parametric testing

Compatibility & Integration The 81606A integrates into the Keysight 8164B Lightwave Measurement System mainframe. It is compatible with current 81600B laser commands and operates under the N7700A photonic application suite software.