The Keysight N7781C is a compact, high-speed polarization analyzer designed to provide comprehensive capabilities for analyzing the polarization properties of optical signals. It represents the state of polarization (SOP) on the Poincaré sphere using Stokes parameters. The instrument is engineered for accuracy across a broad wavelength range, utilizing on-board algorithms and calibration data. Its real-time measurement capability of 1 M samples/s makes it suitable for analyzing fluctuating signals and for control applications requiring immediate polarization feedback, such as in automated manufacturing test systems.
### Technical Specifications
* **Functionality:** Optical Polarization Analyzer
* **Operating Wavelength Range:** 1240 nm to 1650 nm
* **Specification Wavelength Range:** 1270 nm to 1620 nm
* **High-speed Operation:** Up to 1 M samples/s
* **Analog Bandwidth:** Up to 250 kHz
* **State of Polarization (SOP) Measurement Uncertainty:** Typical 1.5°
* **Degree of Polarization (DOP) Measurement Uncertainty:** ±2%, typical ±1.5%
* **Input Power Range:** -50 dBm to +7 dBm
* **PDL (Polarization Dependent Loss) Consideration:** Relative power measurement uncertainty due to PDL (specification)
* **Robust Design:** No moving optical parts
* **Memory:** Up to 1 M samples
### Interfaces
* **Programming:** New SCPI command set
* **Connectivity:** LAN and USB interfaces
* **Resource Addressing:** Addressed as a VISA resource
* **User Interface:** Built-in user interface for data analysis, replacing previous software
### Physical
* **Form Factor:** Compact, one rack unit height
* **Cooling:** Internal cooling fan
* **Mounting:** Can be mounted in a standard 19-inch rack cabinet with optional kits (e.g., N7799C-1CM)
### Environmental and Operating Conditions
* **Operating Temperature:** 5 °C to +40 °C
* **Storage Temperature:** -40 °C to +70 °C
* **Relative Humidity:** Maximum 85% RH, non-condensing
* **Altitude:** Up to 2000 meters
* **Air Clearance:** Minimum 75 mm (3 inches) at the rear, 25 mm (1 inch) at each side
### Applications
* SOP and DOP Measurement
* Analysis of re-circulating signal
* Analysis of PMF ER (Polarization Maintaining Fiber Extinction Ratio)
* Intrusion detection
* Digital control loops in automated manufacturing test systems
* High-speed analysis of SOP/DOP of recirculating signal
* Performance analysis of polarization scramblers
### Compatibility
* Compatible with Keysight 81600B, 8160xA, and N777xC tunable laser sources when configured for certain measurements.
### Documentation
* **Data Sheets:** N778xC Polarization Test Products (.pdf)
* **User Manuals:**
* Keysight N778xC Series Polarization Instruments User’s Guide (.pdf)
* Cleaning Procedures for Optical Instruments (.pdf)
* **Help Files:** N778-C Series Polarization Instruments Help (.zip)
* **Application Notes:** Polarization Alignment Methods (.pdf)
### Why Choose Aumictech for Keysight N7781C?
At Aumictech, we specialize in supplying high-end optical test and measurement equipment. Whether you need precise polarization analysis for R&D, high-speed measurements for manufacturing quality control, or reliable system verification, our team ensures the Keysight N7781C delivers maximum performance for your application.
