Agilent Keysight N7762A Dual Port Single Mode Variable Optical Attenuator

Agilent Keysight N7762A Dual Port Single Mode Variable Optical Attenuator: Precise Dual-Channel Attenuation for Fiber-Optic Test Systems

The Agilent Keysight N7762A Dual Port Single Mode Variable Optical Attenuator is a two-channel programmable attenuator designed for automated fiber-optic test setups, transceiver characterization, and receiver sensitivity measurements. Housed in a single-slot module for the Keysight 8163/8164/8166 lightwave mainframes, it delivers fast, repeatable attenuation with integrated power control on both channels — ideal for engineers running parallel test lines or simulating link loss in DWDM and SDH/SONET environments.

Key Features and Benefits of the Agilent Keysight N7762A Dual Port Single Mode Variable Optical Attenuator

• Two independent attenuator channels — Doubles throughput on a production line by handling two DUTs simultaneously from one mainframe slot.
• 0 to 60 dB attenuation range — Covers everything from minor pad adjustments to deep receiver sensitivity sweeps without swapping hardware.
• 0.001 dB resolution — Allows fine-grained loss steps for BER curves and margin testing where coarse steps would smear results.
• Integrated optical power control — Built-in monitor taps and closed-loop power mode hold a programmed output level even as input power drifts.
• Fast transition speed — Settling times in the tens of milliseconds shorten automated sweeps and reduce overall test time per unit.
• Wavelength range 1260–1640 nm — Supports O-band through L-band testing, covering single-mode telecom and datacom applications from one instrument.
• Low polarization dependent loss — Keeps measurement uncertainty tight when working with polarization-sensitive components or coherent systems.
• SCPI programmable via mainframe — Drops cleanly into existing LabVIEW, Python, or VEE test executives with standard command syntax.

Advanced Capabilities

What sets the N7762A apart from basic mechanical attenuators is its closed-loop power control mode. Instead of just commanding a fixed attenuation value, you can specify a target output power in dBm and let the module hold that level automatically — even if the source laser drifts, the input fiber is bent, or environmental conditions shift mid-test. This is particularly valuable during long burn-in runs and temperature-chamber testing where input stability cannot be assumed.

The dual-channel architecture is more than just two attenuators in one box. Both channels share a common reference and timebase, so synchronized sweeps across two devices under test stay aligned. For engineers qualifying bidirectional transceivers, characterizing optical switches, or running paired BER measurements, this eliminates the timing and calibration drift that comes with using two separate single-channel instruments.

Calibration and Quality Assurance

Every Agilent Keysight N7762A is calibrated prior to shipping to OEM specifications. The order includes a Calibration Certificate, Calibration Label, and full Calibration Data. This means the instrument arrives traceable, audit-ready, and immediately usable in ISO 9001 and TL 9000 environments — no need to schedule a calibration cycle before putting it into service or qualifying it for production use.

Specifications