The Keysight N778xB is a series of optical instruments designed for various polarization analysis and control applications in optical component testing and measurement. The series includes Polarization Analyzers, PER-Analyzers, Thermal Cycling Units, Polarization Controllers, Synchronous Scramblers, Polarization Synthesizers, and Optical Component Analyzers.
Function Description:
The N778xB series provides comprehensive solutions for characterizing optical components and systems by analyzing and controlling polarization states. The instruments are designed to work with the polarizationNAVIGATOR™ software, which offers a user-friendly interface for configuration, measurement, and data analysis.
- N7781B/BD Polarization Analyzer: Measures the polarization state of an optical signal. It is used for applications requiring precise polarization characterization.
- N7782B PER-Analyzer: Measures the Polarization Extinction Ratio (PER) of optical fibers and components. Certain options include an internal laser source for integrated measurements.
- N7783B Thermal Cycling Unit: Used for PER/PMF crosstalk measurements, allowing for controlled temperature cycling of optical fibers or components. It works in conjunction with other N778xB/BD instruments.
- N7784B Polarization Controller: Actively controls the polarization state of an optical signal.
- N7785B Synchronous Scrambler: Scrambles the polarization state of an optical signal, often used to mitigate polarization-dependent effects in measurements.
- N7786B Polarization Synthesizer: Synthesizes specific polarization states, scrambles polarization, or stabilizes polarization.
- N7788B/BD Optical Component Analyzer (PMD/PDL Analysis): Performs Polarization Mode Dispersion (PMD) and Polarization Dependent Loss (PDL) analysis on optical components. This instrument typically requires a tunable laser source for comprehensive characterization.
Important Technical Specifications:
The technical specifications vary depending on the specific N778xB model and its options. Here are some general specifications and examples:
- Laser Class: Laser sources within the N778xB series are classified as Class 1 Laser Products according to IEC 60825-1 (2007) and comply with 21 CFR 1040.10 (except for deviations pursuant to Laser Notice No. 50, dated 2006-June-24).
- Wavelength Range: Varies by model and option. For example, Polarization Analyzers can cover ranges like 1270 nm to 1375 nm, 1460 nm to 1620 nm, or combinations thereof. PER-Analyzers can operate in ranges such as 850 nm to 1000 nm or 1270 nm to 1620 nm.
- Max. CW Output Power: For models with internal laser sources, typical output powers range from 0.2 mW to 15.6 mW, depending on the specific option.
- Beam Waist Diameter: Typically around 9 µm.
- Numerical Aperture: Typically 0.1.
- Permissible CW Output Power (for external sources): Can be up to 15.6 mW or 10 mW, depending on the specific instrument and wavelength.
- Connectivity: USB and GPIB interfaces are available for connecting to a PC. Some models, like the N7781BD and N7788BD, feature a touch screen and USB 2.0 connector on the front panel.
- System Requirements (for PC): Intel Pentium III, 700 MHz or higher; Windows XP SP2 (32-Bit) or Windows 7. For optional features, National Instruments LabView™ 6.1 or higher, or MATLAB 6.1 or higher may be required.
Usage Features:
- Software Control: The instruments are primarily controlled via the Keysight polarizationNAVIGATOR™ software, which provides a graphical user interface for setting up measurements, controlling instruments, and analyzing data.
- Quick Start Information: The manual provides quick start guides for various setups (e.g., N7781B Setup (Polarimetry), N7782B Setup (PER Analysis), N7784B Setup (Polarization Stabilization), N7785B Setup (Polarization Scrambling), N7786B Setup (Polarization Synthesis), N7788B Setup (PMD/PDL Analysis), N7783B Setup (PER Analysis), N7781BD Setup (Polarimetry), N7788BD Setup (PMD/PDL Analysis)).
- Configuration Wizard: Users are instructed to run the Configuration Wizard each time additional instruments are connected to ensure proper setup.
- On-Screen Keyboard: For models with a touch screen (e.g., N7781BD, N7788BD), the on-screen keyboard can be accessed by pressing the Modify Knob twice.
- Remote Access: The instruments can be accessed remotely via network (FTP) or Remote Desktop Connection, allowing for control and data retrieval from a separate computer. The default login credentials for remote access are User: Administrator, Password: sphere314.
- Application Activation: Applications within the polarizationNAVIGATOR™ software can be activated by double-clicking an instrument icon or choosing "Activate" from the context menu. A green arrow indicates an activated instrument.
- Safety Warnings: The manual emphasizes reading laser safety warnings, especially for instruments with internal laser sources. It also provides instructions for safe operation, including proper power disconnection and avoiding hot surfaces.
- Driver Installation: It is crucial to install the polarizationNAVIGATOR™ software before plugging instruments into the PC's USB port to ensure drivers are available. If connected prior to software installation, manual driver deletion from Windows Device Manager may be necessary. The manual provides detailed steps for driver installation and troubleshooting, including handling digitally unsigned drivers.
Maintenance Features:
- Software Updates: The polarizationNAVIGATOR™ software includes a Package Manager for installing and updating different packages. Users can check for newer versions online via the Keysight Update Server.
- Recovery Console: In case of system corruption, the N778xBD instruments provide an emergency recovery tool accessible by pressing ESC during the boot process. This recovery will reset the polarizationNAVIGATOR™ to the version the instrument was delivered with, but the D:\ drive, which contains measurements, will not be modified.
- Warranty: All system warranties and support agreements are dependent on the integrity of the Keysight N778xB/BD. Any modification of the system software or hardware will terminate Keysight Technologies' obligations. A three-year warranty is included, with options for extended warranty periods and on-site troubleshooting.
- Contact Information: Users are advised to contact their nearest Keysight Technologies sales office if anything is missing, defective, or damaged during shipment.
- Rebooting Remote System: Instructions are provided for forcing a reboot of the remote instrument via CTRL-ALT-END in the remote session.
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