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| Agilent N7781B/N7781BD Polarization Analyzer Data Sheet Agilent N7781B Agilent N7781BD Introduction Key features * * * * * Measurement of Stokes parameter (SOP) Measurement of degree of polarization (DOP) High-speed operation (> 1 MSamples/s) Analog output ports for DOP/SOP data Robust, no moving parts The Agilent N7781B is a compact high-speed polarization analyzer that provides comprehensive capabilities for analyzing polarization properties of optical signals. This includes representation of the state of polarization (SOP) on the Poincare sphere (Stokes parameter). The on-board algorithms together with the on-board calibration data ensure highly accurate operation across a broad wavelength range. The Agilent N7781BD also contains a windows based computer unit which allows operation independent from external PCs. Due to its real time measurement capability (1 MSamples/s), the instrument is well suited for analyzing disturbed and fluctuating signals as well as for control applications requiring real time feedback of polarization information. Analog data output ports are provided, for example for support of control loops in automated manufacturing test systems. The provided analysis software allows a comprehensive analysis of the obtained measurement data. Applications Ampl USB 4 ch. ADC DSP & Memory GPIB * * * * * Monitoring / measurement of: - State of polarization (SOP) - Stokes parameter - Degree of polarization (DOP) High-speed analysis of SOP/DOP of signals in recirculating loop setups Analysis of PM-fiber extinction ratio Performance analysis of polarization scramblers Intrusion detection 0 Optical signal 45 45 /4 0 Pol. Ampl Ampl Ampl Trigger in / out Figure 1. Agilent N7781B/BD polarization analyzer setup N7781B/BD instrument setup and application examples The instrument setup of the N7781B/BD polarization analyzer is shown in Figure 1. It consists of a unique polarimeter optics and a high-speed sampling subsystem. The measurement principle is based on splitting the light into four sub beams which are filtered through different polarization filters. The resulting four power levels are evaluated using on-board calibration data to obtain an accurate SOP- and DOP-measurement. Alignment of polarization maintaining fibers Accurate alignment of the polarization axis of polarization maintaining fibers is crucial for the performance of a large range of optical components. The N7781B/BD allows, due to its high-speed capability, real time feedback regarding the currently achieved polarization extinction ratio (PER). See also N7783B for automated PER measurements. Recirculating loop experiments Managing the polarization properties of the fiber loop is mandatory for successfully conducting experiments with such structures. The N7781B/BD high speed polarization analyzer allows an analysis of the SOP and the DOP of the circulating signal. The high sampling rate and the trigger capabilities of the instrument, allow detailed analysis of the evolution of the SOP and the DOP along each revolution. N7781B/BD polarization analyzer Tap coupler Amplifier DUT PMF N7781B/BD polarization analyzer GPIB/USB Swept laser GPIB/USB Computer Figure 3. Alignment of polarization maintaining fibers Fiber loop Pol contr Switch GPIB/USB Trigger Tx unit Rx unit Computer Figure 2. Recirculating loop experiments 2 Agilent N7781B/BD Polarization Analyzer Data Sheet Event trigger Advanced communication systems are sensitive to rapid polarization changes ("events") on fiber links. Such events may be caused for example by trains passing by or by vibrations on bridges. The speed of the polarization events are of concern for system integrators and network operators. The event trigger function of the N7781B/BD allows detecting and recording such events. Transmitter Figure 4. Recirculating loop experiments Tap coupler Receiver N7781B/BD polarization analyzer Table 1. Specifications1) - N7781B/BD Polarization Analyzer Wavelength Specification wavelength range 1270 nm ... 1375 nm (Opt 300, O-Band) 1270 nm ... 1375 nm, 1460 nm ... 1620 nm (Opt 400, O/C/L-Band) 1460 nm ... 1620 nm (Opt 500, C/L-Band) Operating wavelength range Polarization Analysis SOP uncertainty (typical)3),4) DOP uncertainty 3) 2) 1260 nm ... 1640 nm 1.5 2.0 % 0.5 % 1 MHz C/L-Band: O-Band: 30 mdB ( 20 mdB typ.) 70 mdB ( 40 mdB typ.) DOP uncertainty after user calibration (typical)3),5) Maximum sampling rate Optical Power Measurement Relative Power Uncertainty3) Input power range Maximum safe optical input power -50 dBm ... +7 dBm 12 dBm 1) Ambient temperature change max. 0.5C since normalization. Specification valid on day of calibration. 2) SOP/DOP measurements are possible outside the specification wavelength range if the user performs a manual calibration. 3) Input power > -30 dBm 4) DOP > 95% 5) User calibration requires a source with DOP = 100%. Agilent N7781B/BD Polarization Analyzer Data Sheet 3 Agilent Email Updates www.agilent.com/find/emailupdates Remove all doubt Our repair and calibration services will get your equipment back to you, performing like new, when promised. You will get full value out of your Agilent equipment throughout its lifetime. Your equipment will be serviced by Agilent-trained technicians using the latest factory calibration procedures, automated repair diagnostics and genuine parts. You will always have the utmost confidence in your measurements. Agilent offers a wide range of additional expert test and measurement services for your equipment, including initial start-up assistance onsite education and training, as well as design, system integration, and project management. For more information on repair and calibration services, go to: www.agilent.com/find/removealldoubt www.agilent.com For more information on Agilent Technologies' products, applications or services, please contact your local Agilent office. The complete list is available at: Get the latest information on the products and applications you select. www.agilent.com/find/contactus Americas Canada Latin America United States Asia Pacific Australia China Hong Kong India Japan Korea Malaysia Singapore Taiwan Thailand Europe Austria Belgium Denmark Finland France Germany Agilent Direct www.agilent.com/find/agilentdirect Quickly choose and use your test equipment solutions with confidence. (877) 894-4414 305 269 7500 (800) 829-4444 1 800 629 485 800 810 0189 800 938 693 1 800 112 929 81 426 56 7832 080 769 0800 1 800 888 848 1 800 375 8100 0800 047 866 1 800 226 008 0820 87 44 11 32 (0) 2 404 93 40 45 70 13 15 15 358 (0) 10 855 2100 0825 010 700 01805 24 6333* *0.14/minute Ireland 1890 924 204 Italy 39 02 92 60 8484 Netherlands 31 (0) 20 547 2111 Spain 34 (91) 631 3300 Sweden 0200-88 22 55 Switzerland (French) 41 (21) 8113811(Opt 2) Switzerland (German) 0800 80 53 53 (Opt 1) United Kingdom 44 (0) 7004 666666 Other European Countries: www.agilent.com/find/contactus Product specifications and descriptions in this document subject to change without notice. (c) Agilent Technologies, Inc. 2007,2008 Printed in USA, April 29, 2008 5989-8109EN |
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