Keysight Technologies (Agilent HP) Lasers and Optical Sources

Tunable laser sources (TLS) from Keysight are engineered for sweeping across wide optical bands to test passive components and DWDM systems. The Keysight 81689A is a compact, one-slot external cavity laser (ECL) module optimized specifically for the C-band (1525 nm to 1575 nm). For broader spectral requirements, the Keysight 81640A covers both the C- and L-bands from 1510 nm to 1640 nm, offering a fine wavelength tuning resolution of 0.1 pm and continuous sweep speeds up to 40 nm/s.\n\nFor high-performance laboratory or manufacturing environments, the Keysight 81600B module offers several wavelength options, such as Option 200 (1440 nm to 1640 nm) and Option 130 (1260 nm to 1375 nm), allowing customization based on the target spectral band. If a standalone benchtop instrument is required, the Keysight 8168F external cavity diode laser provides tuning from 1450 nm to 1590 nm with a typical spectral linewidth of 100 kHz.

For applications requiring stable, fixed-wavelength reference signals rather than continuous tuning, Keysight offers modular Fabry-Perot (FP) sources. The Keysight 81654A is a dual-wavelength module operating at center wavelengths of 1310 nm and 1550 nm, which is suited for standard single-mode fiber testing. Alternatively, the Keysight 81657A provides 1550 nm and 1625 nm dual-wavelength options, supporting out-of-band testing.\n\nBoth modules fit directly into standard Keysight lightwave mainframes, support internal modulation at discrete frequencies from 270 Hz to 2 kHz, and utilize user-exchangeable 81000xI connector adapters.

For high-speed receiver and system transmission testing, the Keysight 83430A is a standalone distributed feedback (DFB) laser source. This unit converts digital electrical inputs into SDH/SONET-compliant optical outputs. While it features a standard 1550 nm center wavelength, several dedicated options provide specific alternate wavelengths, such as Option 130 (1310 nm) and Option 462 (1546.2 nm). It also supports front-panel temperature tuning control over a narrow range of ±1.25 nm.