N7768A Keysight 4-channel Multimode Optical Attenuator

• Micro-body fiber for optimal modal transmission distribution

• Built-in power monitoring helps achieve precise power settings and stabilization

• Wavelength range: 800 to 1370 nm

• Attenuation range: 0 to 35 dB

• Relative power monitoring uncertainty: ±0.1 dB + 300 pW

• Set-up time: 200 ms typical

• Conversion speed: Select from 0.1 to 80 and 1000 dB/s

• Optical path blockage: >60 dB typical

The optical attenuator is used to provide flexible control of the optical signal power in the test setup. The primary application is to determine the sensitivity of an optical receiver by measuring the variation of the BER with the input signal power. The N7766A and N7768A provide 2 or 4 attenuator channels for multimode fiber optic units with 50 µm or 62.5 µm fiber ports, respectively. By monitoring the output power, precise and stable power settings can be achieved at any input power. Using convenient bias parameters, the set power can be made to match the signal after other optical devices in the test set path.