The Agilent/Keysight 81001FF is a fixed diffraction filter that attenuates optical signals across a broad wavelength range, preventing overload of sensitive optical power meters when measuring high-power sources. The mesh diffraction filter provides approximately 10 dB of attenuation with excellent flatness across its operational band. Two units can be cascaded to achieve ~20 dB attenuation. Polarization dependent loss is minimal at 0.05 dB peak-to-peak, and the filter integrates directly with 815xxx and 816xxx series optical heads and related adapter components.
Technical Specifications
• Type: Fixed Diffraction Filter
• Attenuation: Approximately 10 dB nominal
• Wavelength Range: 450 nm to 1700 nm
• Attenuation Flatness: Relatively flat across operational range
• Polarization Dependent Loss (PDL): 0.05 dB peak-to-peak
• Cascading: Two 81001FF units achieve approximately 20 dB attenuation
– Key Features
• Mesh diffraction filter construction in integrated holder
• Low PDL minimizes signal degradation in polarization-sensitive measurements
• Flat attenuation response enables consistent signal reduction across 450–1700 nm
• Cascadable design allows flexible attenuation configurations
– Typical Applications
• Measurement of high-power laser diodes and LEDs that exceed optical head input specifications
• Signal attenuation for optical power meters with limited dynamic range (e.g., 81520A at +10 dBm, 81521B at +3 dBm maximum input)
• Broadband optical testing from visible to near-infrared wavelengths
– Compatibility & Integration
• Compatible with Agilent/Keysight 815xxx and 816xxx optical heads
• Works with 81000 series optical head connector adapters
• Pairs with 81000DF depolarizing filter to further reduce PDL in sensitive applications
• Integrates with 81000AF 1-inch filter holder for specialized mounting configurations
