Agilent/Keysight 81608A Tunable Laser Module (1370–1510 nm)

The Keysight 81608A Tunable Laser Module delivers precise wavelength control and stable optical output across the 1370–1510 nm band. This source combines narrow linewidth, low spontaneous emission, and excellent wavelength repeatability, making it ideal for coherent transmission experiments and manufacturing-floor component testing. The module integrates into the 8164B Lightwave Measurement System mainframe and operates with user-adjustable output power down to 0 dBm, supported by the N7700A photonic application suite.

Technical Specifications

Wavelength Performance

• Tuning range: 1370–1510 nm (Option 114)


• Absolute accuracy (static): ±5 pm typical


• Absolute accuracy (sweeping): ±10 pm typical


• Wavelength repeatability: ±1.5 pm typical (two-way sweeps to 200 nm/s)


• Sweep speed: up to 200 nm/s bidirectional Optical Output


• Peak output power: >+12 dBm typical


• Output level range: >±12 dBm


• User-adjustable power down to 0 dBm


• Signal-to-spontaneous emission ratio: ≥75 dB/nm typical


• Power stability: ±0.03 dB over 24 hours Physical & Environmental


• Dimensions: 16 × 14 × 10 in


• Weight: 25 lbs


• Storage/shipping temperature: -40 °C to +70 °C


• Output connector: PMF with angled contact


• Front panel: two BNC connectors (input/output); maximum ±6 V external voltage rated

Key Features

• Narrow linewidth with low spontaneous emission for accurate, reliable measurements


• Long-term stability enhanced by built-in gas cell and self-adjustment


• Bidirectional sweep capability maintains ±1.5 pm repeatability at 200 nm/s


• Dry air or nitrogen operation recommended in high water-absorption regions (1350–1420 nm); optional dry air connector available


• Back-loadable design fits 8164B mainframe bottom slot

Typical Applications

• Coherent transmission system characterization


• Component testing on manufacturing floors


• Spectral measurements via N7700A software integration

Compatibility & Integration Module integrates into Keysight 8164B Lightwave Measurement System mainframe; supported by N7700A photonic application suite. Laser classified per IEC 60825-1; compliant with 21 CFR 1040.10 per Laser Notice No. 50 (June 24, 2007).