The Keysight N7744A is a four-channel optical multiport power meter engineered for simultaneous, high-accuracy power measurements across multiple optical channels. It delivers measurement speeds up to 1 MHz sampling rate with data logging for 1 million points per channel, making it ideal for high-throughput manufacturing and research characterization. The instrument excels at testing multiport optical components—multiplexers, PON splitters, wavelength selective switches, and ROADMs—as well as parallel single-port device validation.
Technical Specifications
The N7744A operates across the 1250 nm to 1650 nm wavelength band with specification accuracy to 1625 nm. Power measurement range spans -80 dBm to +10 dBm with ±2.5% power uncertainty and ±4.5% total uncertainty. Relative port-to-port uncertainty is typical ±0.05 dB. InGaAs sensors deliver linearity of ±0.02 dB ± 3 pW at 23 ±5°C. Polarization-dependent responsivity remains below ±0.01 dB (1520–1580 nm), with spectral ripple under ±0.01 dB across the 1520–1625 nm band.
Measurement performance includes 1 µs to 10 s adjustable averaging time with up to 240 kHz 3dB-cutoff bandwidth. Dynamic range reaches 65 dB in swept and logging modes without ranging. Dark drift is ±9 pW. Memory capacity provides 1 million averaged power values per channel across two buffers.
– Key Features
• Four independent power-sensor channels for simultaneous multiport measurements
• LXI-compliant instrument with programmable interfaces: LAN, USB, and GPIB
• Patented N7740 fiber connectivity using quad-adapter with snap-on quick-lock mechanism
• Supports MU, FC, SC, and LC connectors plus bare fiber configurations
• Maximum safe optical power rating of +16 dBm
• Dark noise peak-to-peak below 1 pW at 1 second averaging and 300 second observation
– Typical Applications
• Multiport optical component characterization (ROADMs, WSS, PON splitters)
• Simultaneous single-port device testing and validation
• High-speed power logging and trend analysis
• Manufacturing throughput optimization with compact rack footprint
– Compatibility & Integration
The N7744A integrates with Agilent’s Lightwave measurement ecosystem. The one-click N7740ZI zeroing adapter enables rapid four-port calibration. Compatible with Agilent standard bare fiber connectivity 81000BI.
