N7752A

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 Introduction The Agilent N775xA and N776xA series compact multi-channel attenuators 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 today’s challenges in manufacturing. Power measurements In addition, the Agilent N7751A and N7752A attenuators include two extra optical power meter channels for convenient power measurements and setup calibration. Key specifications and features • Settling time: 20 ms attenuation, 100 ms power • 0.1 to 1000 dB/s attenuation transition speed (selectable) 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, connectors and switches. Additionally, wavelength and offset value pairs can be stored in a table to compensate 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. Operation Modes All attenuators feature both attenuation 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. • • • • • +23 dBm max. input power ≤ 1.2 dB insertion loss One half-width rack unit 45 dB attenuation range (typ.) –50 dBm to +20 dBm power setting range programs developed using the Agilent 8157x modular attenuators • Fully compatible with setups and • Powerful and user-friendly GUI software • Two instrument configurations can be stored and recalled Input Attenuator Coupler Output Power meter Figure 1. Optical Attenuator with power control 2 The Multi-Channel Attenuator Series – Product Configurations 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. Benefits • 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 1-channel variable attenuator N7761A 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 multichannel components and network equipment. 2-channel variable attenuator N7762A • Active power control keeps output power constant. • The instrument can be controlled 4-channel variable attenuator N7764A 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. 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 3 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 attenuator’s output with one click • Choose between setting an attenuation or an output power Definitions Generally, all specifications are valid at the stated operating and measurement conditions and settings, with uninterrupted line voltage. Optical network integration testing When integrating and testing network equipment to test network transmission 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 attenuators 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. Specifications (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 uncertainties changes in performance due to environmental changes and aging of components. 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. 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. 4 Technical Specifications Table 1. Optical attenuator N7751A, N7752A, N7761A, N7762A, N7764A Connectivity Fiber type Wavelength range Attenuation range Attenuation resolution Range Resolution Repeatability1 Accuracy (uncertainty)1, 2, 3 0 dB to 40 dB 0.01 dB ± 0.05 dB typ. typ. ± 0.10 dB for attenuation 0 dB to 10 dB 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 5 FC/APC angled (Option -022) or FC/PC straight (Option -021) contact connector interface 9/125 µm SMF 28 1260 nm to 1640 nm 0 dB to 40 dB (45 dB typ.) 0.01 dB Attenuation setting mode Power setting mode –50 dBm to +20 dBm 0.01 dB ± 0.025 dB ± 0.05 dB4 ± 300 pW typ. 100 ms4 ≤ 0.15 dBPP9 typ. 20 ms typ. ≤ 0.15 dBPP for attenuation 0 dB to 10 dB typ. ≤ 0.25 dBPP for attenuation 10 dB to 20 dB typ. ≤ 0.5 dBPP for attenuation 20 dB to 40 dB Polarization dependency Insertion loss 2, 6 typ. ≤ 1.2 dB (excluding connectors) ≤ 2.2 dB (including connectors)7 selectable from 0.1 to 1000 dB/s ±0.05 dB ± 300 pW 2 ms to 1 s typ. 45 dB +23 dBm typ. 45 dB Attenuation transition speed Relative uncertainty of monitor power meter2, 8 Averaging time of monitor power meter Return loss Maximum safe input power Optical path blocking 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. At constant operating conditions. For unpolarized light. Temperature constant and between (23 ± 5) °C. For (1310 ±15) nm, (1490 ±10) nm and (1550 ±15) nm. For 2 ms averaging time. Output power > –40 dBm, input power < +10 dBm. For input power > +10 dBm add typ. ± 0.02 dB . For (1550 ±15) nm. Add typ. 0.05 dB for (1310 ±15) nm and (1490 ±10) nm. For (1550 ±15) nm. Add typ. 0.20 dB for (1310 ±15) nm and (1490 ±10) nm. Measured with Agilent reference connectors. For (1550 ±15) nm. For 2 ms averaging time. Output power > –30 dBm, input power < +10 dBm. For 20 dB step. 5 Table 2. Optical power meter N7751A and N7752A Sensor element Wavelength range Specification wavelength range Power range Maximum safe power Averaging time Applicable fiber type Uncertainty at reference conditions 1, 3 Total uncertainty 2, 5, 6 InGaAs 1260 nm to 1640 nm (1310 ±15) nm, (1490 ±10) nm, (1550 ±15) nm –80 dBm to +10 dBm +16 dBm 2 ms to 1s Standard SM and MM ≤ 62.5 µm core size, NA ≤ 0.24 ±2.5% ±4.5% ±0.02 dB ± 3 pW ±0.04 dB ± 5 pW typ. < ±0.01 dB (1260 nm to 1580 nm) typ .< ±0.01 dB ±9 pW < 7 pWpp typ. > 57 dB Linearity 5, 6 at (23 ± 5)°C over operating temperature Polarization dependent responsivity (PDR)3, 7 Spectral ripple (due to interference)9 Drift (dark) 4 3 Noise pp (dark) , (1s averaging time, 300s observation time) Return loss8 1. Reference conditions: Single mode fiber SMF 9 µm. Power Level: –20 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. Operating conditions: Single mode fiber SMF. For multimode fiber, 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. Ambient temperature (23 ±5) °C Temperature constant within ±1 K after zeroing Excluding noise and offset drift Power range –60 dBm to +10 dBm Straight connector, SMF Angled connector 8°, ceramic ferrule, SMF 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 specification wavelength range for straight connector with ceramic ferrule. 2. 3. 4. 5. 6. 7. 8. 9. 6 General Characteristics Dimensions (H x W x D): 1U half-rack 372 mm x 212 mm x 43 mm (excluding 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 N7752A N7761A N7762A N7764A Optical Attenuator (1 Channel) with Optical Power Meter (2 Channels) Optical Attenuator (2 Channels) with Optical Power Meter (2 Channels) Optical Attenuator (1 Channel) Optical Attenuator (2 Channels) Optical Attenuator (4 Channels) Connector interface option -021 -022 Accessories N7744-100 Warranty All systems have 1 year warranty R-51B-001-3C R-51B-001-5C Calibration R-50C-011-3 R-50C-011-5 Agilent calibration upfront support plan 3 year coverage Agilent calibration upfront support plan 5 year coverage 1 year Return-to-Agilent warranty extended to 3 years 1 year Return-to-Agilent warranty extended to 5 years Rack Mount Kit for 1 or 2 Units Straight contact connector Angled contact connector 7 www.agilent.com www.agilent.com/find/voa Agilent Email Updates For more information on Agilent Technologies’ products, applications or services, please contact your local Agilent office. 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