Agilent/Keysight 81480B – Tunable Laser Source

The Keysight 81480B Tunable Laser Source is a modular optical instrument for precision wavelength-swept testing of DWDM passive components and optical systems. Delivering continuous, mode-hop-free tuning across the E- and S-bands with ±10 pm wavelength accuracy and 80 nm/s sweep speed, this laser provides both high-power and low-noise outputs optimized for amplifier characterization and dynamic-range-limited measurements. A built-in wavelength meter enables real-time spectral control, while dual Panda-type polarization-maintaining fiber outputs support integration into comprehensive optical test benches.

Technical Specifications

• Wavelength Range: 1375 nm to 1495 nm (E- and S-band coverage)


• Wavelength Accuracy (Absolute): ±10 pm


• Tuning Characteristic: Continuous sweep, mode-hop-free operation


• Maximum Tuning Speed: 80 nm/s


• Maximum Output Power: +5.5 dBm (Output 2)


• Optical Outputs: High-power and low-source-spontaneous-emission (SSE) channels


• Built-in Wavelength Meter: Real-time monitoring and closed-loop control


• Fiber Connectors: Panda-type polarization-maintaining outputs

Key Features

• Mode-hop-free continuous tuning eliminates spectral discontinuities during wavelength sweeps


• Dual-output architecture separates amplifier testing (high power) from precision filter and component characterization (low SSE)


• ±10 pm absolute wavelength accuracy supports tight tolerance DWDM channel specifications


• Integrated wavelength meter provides feedback control and eliminates need for external wavelength reference instrumentation


• Fast tuning speed (80 nm/s) reduces test time on production lines and in characterization workflows

Typical Applications

• DWDM passive component testing (multiplexers, demultiplexers, filters)


• Optical amplifier gain and noise figure characterization


• Wavelength-dependent loss and dispersion measurement in optical subsystems


• R&D development of narrow-linewidth optical filters and wavelength-selective devices

Compatibility & Integration The 81480B operates as a plug-in module within Keysight's modular mainframe architecture (e.g., 8164B Lightwave Solution Mainframe). Dual Panda-type fiber outputs enable direct integration with external test platforms and optical subsystems requiring polarization-maintaining signal paths.