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  agilent n7751a 1-channel optical attenuator and power meter n7752a 2-channel optical attenuator and power meter n7761a 1-channel optical attenuator n7762a 2-channel optical attenuator N7764A 4-channel optical attenuator data sheet preliminary version 0.9
2 introduction the agilent n775xa and n776xa series compact multi-channel attenu- ators and power meters are a new class of remote controlled fiberoptic instruments for optical transceiver and network integration test. high setting speed of attenuation and power and power measurement capability, combined with usb, lan and gpib interfaces provides increased throughput and operational efficiency to meet todays challenges in manufacturing. operation modes all attenuators feature both attenua- tion mode and power control mode. in attenuation mode, the calibrated value of attenuation in db can be set. the rate of attenuation change during setting can also be adjusted between 0.1 and a very fast 1000 db/s. the power control functionality allows you to set the power level at the attenuator output. the instrument uses the feedback signal from a photodiode after a monitor tap, both integrated in the instrument, to set the desired power level at the output of the module (figure 1). when the power control mode is enabled, the module automatically corrects for power changes at the input so that the output power level you set is maintained. absolute power levels can be set with high accuracy after an initial offset calibration for the uncertainties at connector interfaces. power measurements in addition, the agilent n7751a and n7752a attenuators include two extra optical power meter channels for convenient power measurements and setup calibration. user calibration processes comprehensive offset functionality allows you to calibrate the optical path in various test set-ups. there is an offset for the attenuation factor, and an independent offset for the output power level, to calibrate for losses due to patch cords, connec- tors and switches. additionally, wavelength and offset value pairs can be stored in a table to com- pensate for wavelength-dependent effects in the optical path of the set-up. this allows you to precisely set the optical power level directly at the input interface of your device under test. with the extra optical power meter channel, calibration is even easier and more convenient. all power related offsets can be determined by a firmware function that reads a value from the reference power meter. the difference between the power value read by the reference power meter and the actual value of the attenuator is automatically stored as the offset. key speci? cations and features ? settling time: 20 ms attenuation, 100 ms power ? 0.1 to 1000 db/s attenuation transition speed (selectable) ? +23 dbm max. input power ? 1.2 db insertion loss ? one half-width rack unit ? 45 db attenuation range (typ.) ? C50 dbm to +20 dbm power setting range ? fully compatible with setups and programs developed using the agilent 8157x modular attenuators ? powerful and user-friendly gui software ? two instrument configurations can be stored and recalled coupler attenuator power meter input output figure 1. optical attenuator with power control
3 n776xa multi-channel optical attenuators with internal power control the agilent n776xa multichannel optical attenuators with 1, 2 and 4 attenuator channels in one unit provide an excellent combination of versatility and density. 1-channel variable attenuator n7761a 2-channel variable attenuator n7762a 4-channel variable attenuator N7764A n775xa multi-channel optical attenuators with internal power control and external power meter channels the agilent n775xa multichannel optical attenuators offer 1 or 2 attenuator channels combined with two power meter channels in one unit. 1-channel attenuator with two power meter channels n7751a 2-channel attenuator with two power meter channels n7752a bene? ts ? compact instrument combines and integrates multiple functions for setting attenuation and power levels and optical power measurement to reduce capex and floor space. ? fast and precise setting of optical power levels in parallel with settling times of 100 ms for improved throughput. ? the multichannel attenuator sets and measures several ports at the same time, saving significant time characterizing multiport and multi- channel components and network equipment. ? active power control keeps output power constant. ? the instrument can be controlled via lan and usb, as well as gpib for compatibility with existing equipment. ? an easy-to-use and intuitive graphical user interface speeds up the integration process. the multi-channel attenuator series C product con? gurations
4 the n77xx-viewer: an easy-to-use graphical user interface the n77xx windows-based graphical user interface offers flexible and convenient control of the instrument ? easy switching between channels with tabs ? overview window with all channels at a glance ? two instrument configurations can be stored and recalled ? enable or disable the attenuators output with one click ? choose between setting an attenuation or an output power applications optical transceiver testing one of the challenges in testing transceivers is parallelization of bit-error-ratio measurements for multiple-device and multichannel device measurements. sensitivity measurements require fast and precise setting of optical power levels in parallel at the receiver inputs with settling times like 100 ms for improved throughput. optical network integration testing when integrating and testing network equipment to test network transmis- sion performance and network management, including meshed networks using roadms, attenuators represent link spans between network nodes or amplifier stages. the very fast attenuation and power setting response of the agilent n775xa and n776xa attenu- ators allows simulation of many network configurations in a short time. in the path-blocking mode, fiber network cuts are emulated. with the attenuation and power ramp feature, the attenuation and/or the output power is changed at a defined rate of 0.1 db/s to 1000 db/s. this feature simulates slow and fast changes in the fiber network for testing the network management system. de? nitions generally, all specifications are valid at the stated operating and measure- ment conditions and settings, with uninterrupted line voltage. speci? cations (guaranteed) describes warranted product performance that is valid under the specified conditions. specifications include guard bands to account for the expected statistical performance distribution, measurement uncertain- ties changes in performance due to environmental changes and aging of components. typical values (characteristics) characteristics describe the product performance that is usually met but not guaranteed. typical values are based on data from a representative set of instruments. general characteristics give additional information for using the instrument. these are general descriptive terms that do not imply a level of performance.
5 technical speci? cations table 1. optical attenuator n7751a, n7752a, n7761a, n7762a, N7764A connectivity fc/apc angled (option -022) or fc/pc straight (option -021) contact connector interface fiber type 9/125 m smf 28 wavelength range 1260 nm to 1640 nm attenuation range 0 db to 40 db (45 db typ.) attenuation resolution 0.01 db attenuation setting mode power setting mode range 0 db to 40 db C50 dbm to +20 dbm resolution 0.01 db 0.01 db repeatability 1 0.05 db typ. 0.025 db accuracy (uncertainty) 1, 2, 3 typ. 0.10 db for attenuation 0 db to 10 db 0.05 db 4 300 pw typ. 0.15 db for attenuation 10 db to 20 db typ. 0.50 db for attenuation 20 db to 40 db settling time 10 typ. 20 ms typ. 100 ms 4 polarization dependency 5 typ. 0.15 db pp for attenuation 0 db to 10 db 0.15 db pp 9 typ. 0.25 db pp for attenuation 10 db to 20 db typ. 0.5 db pp for attenuation 20 db to 40 db insertion loss 2, 6 typ. 1.2 db (excluding connectors) 2.2 db (including connectors) 7 attenuation transition speed selectable from 0.1 to 1000 db/s relative uncertainty of monitor power meter 2, 8 0.05 db 300 pw averaging time of monitor power meter 2 ms to 1 s return loss typ. 45 db maximum safe input power +23 dbm optical path blocking typ. 45 db 1. at constant operating conditions. 2. for unpolarized light. temperature constant and between (23 5) c. 3. for (1310 15) nm, (1490 10) nm and (1550 15) nm. 4. for 2 ms averaging time. output power > C40 dbm, input power < +10 dbm. for input power > +10 dbm add typ. 0.02 db . 5. for (1550 15) nm. add typ. 0.05 db for (1310 15) nm and (1490 10) nm. 6. for (1550 15) nm. add typ. 0.20 db for (1310 15) nm and (1490 10) nm. 7. measured with agilent reference connectors. 8. for (1550 15) nm. 9. for 2 ms averaging time. output power > C30 dbm, input power < +10 dbm. 10. for 20 db step.
6 table 2. optical power meter n7751a and n7752a sensor element ingaas wavelength range 1260 nm to 1640 nm specification wavelength range (1310 15) nm, (1490 10) nm, (1550 15) nm power range C80 dbm to +10 dbm maximum safe power +16 dbm averaging time 2 ms to 1s applicable fiber type standard sm and mm 62.5 m core size, na 0.24 uncertainty at reference conditions 1, 3 2.5% total uncertainty 2, 5, 6 4.5% linearity 5, 6 at (23 5)c over operating temperature 0.02 db 3 pw 0.04 db 5 pw polarization dependent responsivity (pdr) 3, 7 typ. < 0.01 db (1260 nm to 1580 nm) spectral ripple (due to interference) 9 typ .< 0.01 db drift (dark) 4 9 pw noise pp (dark) 3 , (1s averaging time, 300s observation time) < 7 pw pp return loss 8 typ. > 57 db 1. reference conditions: single mode ? ber smf 9 m. power level: C20 dbm to 0 dbm. on day of calibration (add 0.3% for aging over one year; add 0.6% for aging over two years). spectral width of source < 10 nm fwhm. wavelength setting of power sensor corresponds to source wavelength 0.4 nm. 2. operating conditions: single mode ? ber smf. for multimode ? ber, typical. within one year of calibration; add 0.3% for second year. spectral width of source < 10 nm fwhm. wavelength setting of power sensor corresponds to source wavelength 0.4 nm. 3. ambient temperature (23 5) c 4. temperature constant within 1 k after zeroing 5. excluding noise and offset drift 6. power range C60 dbm to +10 dbm 7. straight connector, smf 8. angled connector 8, ceramic ferrule, smf 9. for constant state of polarization, source linewidth < 100 mhz, angled connector 8, wavelength range 1260 nm to 1625 nm. add 0.01 db typ. within speci? cation wavelength range for straight connector with ceramic ferrule.
7 general characteristics dimensions (h x w x d): 1u half-rack 372 mm x 212 mm x 43 mm (exclud- ing front and back rubber cushions) weight: approx. 3 kg recommended recalibration period 24 month operating temperature +5 c to +40 c operating humidity 15% to 95%, non-condensing altitude the maximum operating altitude is 2000 m. pollution protection the agilent n775xa/6xa is designed for pollution degree 2. warm-up time 20 minutes interfaces the instruments can be controlled via lan, usb or gpib interfaces power consumption line power: ac 100 - 240 v 0%, 50/60 hz, 60 va max. ordering information all systems have 1 year warranty model number n7751a optical attenuator (1 channel) with optical power meter (2 channels) n7752a optical attenuator (2 channels) with optical power meter (2 channels) n7761a optical attenuator (1 channel) n7762a optical attenuator (2 channels) N7764A optical attenuator (4 channels) connector interface option -021 straight contact connector -022 angled contact connector accessories n7744-100 rack mount kit for 1 or 2 units warranty all systems have 1 year warranty r-51b-001-3c 1 year return-to-agilent warranty extended to 3 years r-51b-001-5c 1 year return-to-agilent warranty extended to 5 years calibration r-50c-011-3 agilent calibration upfront support plan 3 year coverage r-50c-011-5 agilent calibration upfront support plan 5 year coverage
remove all doubt our repair and calibration services will get your equipment back to you, per- forming like new, when promised. you will get full value out of your agilent equipment through-out its lifetime. your equipment will be serviced by ag- ilent-trained technicians using the lat- est factory calibration procedures, au- tomated repair diagnostics and genuine parts. you will always have the utmost confidence in your measurements. for information regarding self main- tenance of this product, please contact your agilent office. agilent offers a wide range of addi- tional expert test and measurement services for your equipment, including initial start-up assistance, onsite edu- cation and training, as well as design, system integration, and project man- agement. for more information on repair and calibration services, go to: www.agilent.com/find/removealldoubt agilent email updates www.agilent.com/find/emailupdates get the latest information on the products and applications you select. agilent direc t www.agilent.com/find/agilentdirect quickly choose and use your test equipment solutions with confidence. www.lxistandard.org lxi is the lan-based successor to gpib, providing faster, more efficient connectivity. agilent is a founding member of the lxi consortium. www.agilent.com www.agilent.com/find/voa for more information on agilent technologies products, applications or services, please contact your local agilent office. the complete list is available at: www.agilent.com/? nd/contactus americas canada (877) 894-4414 latin america 305 269 7500 united states (800) 829-4444 asia paci? c australia 1 800 629 485 china 800 810 0189 hong kong 800 938 693 india 1 800 112 929 japan 0120 (421) 345 korea 080 769 0800 malaysia 1 800 888 848 singapore 1 800 375 8100 taiwan 0800 047 866 thailand 1 800 226 008 europe & middle east austria 01 36027 71571 belgium 32 (0) 2 404 93 40 denmark 45 70 13 15 15 finland 358 (0) 10 855 2100 france 0825 010 700* *0.125 /minute germany 07031 464 6333 ireland 1890 924 204 israel 972-3-9288-504/544 italy 39 02 92 60 8484 netherlands 31 (0) 20 547 2111 spain 34 (91) 631 3300 sweden 0200-88 22 55 switzerland 0800 80 53 53 united kingdom 44 (0) 118 9276201 other european countries: www.agilent.com/? nd/contactus revised: july 2, 2009 product specifications and descriptions in this document subject to change without notice. ? agilent technologies, inc. 2009 printed in usa, september 10, 2009 5990-4394en


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