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N7768C Four-Channel Multimode Optical Attenuator

The N7768C is a four-channel power-monitored optical attenuator for multimode fiber applications. Its bulk-optic filter and collimated beam path is designed to assure homogeneous attenuation of all input modes. It maintains the beam profile of signals that comply with the encircled flux conditions of IEC 61280-4-1. Speed, compactness and optical quality are optimized for manufacturing test.

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Highlights

Miniature bulk optics for best transfer of modal distribution
Built-in power monitoring for accurate power setting and stabilizing
Wavelength range: 800 – 1370 nm
Relative power monitor uncertainty: ±0.1 dB ± 300 pW
Settling time: typ. 200 ms
Transition speed: selectable from 0.1 to 80 and 1000 dB/s
Optical path blocking: typ. >60 dB

Optical attenuator instruments are used to flexibly control optical signal power levels in test setups. A primary application is determining optical receiver sensitivity by measuring the BER vs. input signal power. The N7768C provides 4 attenuator channels for 50 µm/ OM3 multimode fiber setups.

For dependable multimode transceiver testing, the instrument used to set the power level should not change this modal distribution. The bulk-optic filter and collimated beam path of the N7768C multimode attenuator is designed to assure homogeneous attenuation of all input modes. It maintains the beam profile of signals that comply with the encircled flux conditions of IEC 61280-4-1.

The output power is monitored, especially to allow accurate and stable power setting independent of the input power. Convenient offset parameters allow the set power to correspond to the signal after other optical components in the setup path.