The Keysight N7786B Polarization Synthesizer is a versatile optical instrument designed for advanced polarization control and analysis in optical communication systems and research environments. It integrates a high-speed Lithium-Niobate based polarization controller and a polarization analyzer, driven by microcontroller-based circuitry. This device can function as a polarization stabilizer, ensuring a consistent output state of polarization (SOP) despite input fluctuations, or as a dynamic SOP modulator. Its applications span across transmission system testing for polarization sensitivity analysis, recirculating loop experiments for loop-synchronous polarization scrambling, and interferometry for polarization stabilization.
### Technical Specifications
* **Wavelength Range:**
* 1270 nm to 1375 nm (Opt 400, O/C/L-Band)
* 1460 nm to 1620 nm (Opt 500, C/L-Band)
* Operating Wavelength Range: 1260 nm to 1640 nm
* **Polarization Control and Stabilization:**
* SOP Switching Time (non-deterministic): < 10 µs
* SOP Cycling Time: < 25 µs
* Remaining SOP Error after deterministic SOP setting:
* < 3° at an input SOP movement rate of 1.2 rad/s
* < 6.5° at an input SOP movement rate of 40 rad/s
* SOP Uncertainty (typical): 1.5°
* Degree of Polarization (DOP) Uncertainty: ± 2.0%
* DOP Uncertainty after user calibration (typical): ± 0.5%* **Power Measurement Characteristics:**
* Relative Power Uncertainty (C/L-Band): ± 140 mdB (± 120 mdB typical)
* Relative Power Uncertainty (O-Band): ± 160 mdB (± 140 mdB typical)
* Input Power Range: -38 dBm to +19 dBm
* Insertion Loss: < 4.0 dB (< 3.5 dB typical)* **Operating Environment:**
* Operating Temperature: +5 °C to +40 °C
* Operating Humidity: 0% to 80%, non-condensing
* Maximum Operating Altitude: 2000 m
* Pollution Protection: Pollution degree 2* **Warm-up Time:** 20 minutes### Functional ModesThe Keysight N7786B can operate in multiple modes:* **Polarization Stabilizer:** Provides a stable output SOP, compensating for input fluctuations and drifts. The output SOP can be set and forgotten, or defined using Stokes parameters.
* **Synchronous Scrambler:** Switches the SOP in a pseudo-random manner with a cycling speed of up to 100 kSOPs/s, enabling loop-synchronous polarization scrambling. Switching occurs within microseconds, and an electrical trigger input allows synchronization with external events.
* **SOP Switch:** Cycles through a user-defined sequence of SOPs at a speed exceeding 40 kHz, corresponding to cycle times under 25 microseconds.
* **Traditional Scrambler:** Varies the output SOP randomly, achieving full coverage of the Poincaré Sphere within milliseconds.
* **Polarization Analyzer:** Offers high-speed analysis capabilities, capable of acquiring over 500,000 samples at a rate of up to 1 Megasample per second.### Applications* **Swept-Wavelength PDL Measurements:** Used in conjunction with Keysight's N7700A PDL software and a tunable laser for single-sweep polarization-dependent loss measurements.
* **Transmission System Test:** Analyzes polarization sensitivity and its impact on link/transmission quality.
* **Recirculating Loop Experiments:** Facilitates loop-synchronous polarization scrambling for generating results comparable to deployed systems.
* **Interferometry:** Stabilizes polarization to maximize contrast ratio in fiber-optic-based interferometers or coherent receiver schemes.
* **Polarization Analysis:** Provides detailed analysis of polarization states.### Interfaces* USB
* GPIB
* Electrical Trigger Input
* Trigger Out### Physical Characteristics* **Dimensions:** 380 mm x 213 mm x 88 mm (excluding front and back rubber cushions and handle)
* **Weight:** Approximately 4 kg### Compatibility* The N7786B is supported by Keysight PC software, with provided DLL interfaces for connectivity to external applications.
* It can be combined with the N7700A IL/PDL software package for insertion loss and polarization-dependent loss measurements.### Notes* The Agilent N7786B is now known as the Keysight N7786B.
* The N7786B is considered an obsolete product.Why Choose Aumictech for Keysight N7786B?
At Aumictech, we specialize in supplying high-end optical test and measurement equipment. Whether you need comprehensive polarization stabilization, precise SOP switching, or high-speed polarization analysis, our team ensures the Keysight N7786B delivers maximum performance for your application.
