Agilent 83430A Lightwave Transmitter User’s Guide
© Copyright 2000 Agilent Technologies All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under copyright laws. Agilent Part No. 83430-90011 Printed in USA February 2000 Agilent Technologies Lightwave Division 1400 Fountaingrove Parkway Santa Rosa, CA 95403-1799, USA (707) 577-1400 Notice. The information contained in this document is subject to change without notice.
The Agilent 83430A—At a Glance The Agilent 83430A—At a Glance The Agilent 83430A lightwave transmitter is a directly modulated DFB laser source for digital and analog testing up to 2.5 Gb/s. Designed for evaluating the performance of high-speed TDM (time division multiplexed) and WDM (wavelength division multiplexed) optical receivers and systems, it is SDH/SONET compliant.
The Agilent 83430A—At a Glance Test Capabilities in Systems The Agilent 83430A can be used as a general optical source or combined with other instrumentation in systems to make a variety of measurements. • Optical parametric tests — optical receiver sensitivity, dispersion power penalty of single-mode fiber (with an Agilent 71603A error performance analyzer and Agilent 83446A lightwave clock/data receiver).
The Agilent 83430A—At a Glance Laser classification The Agilent 83430A is classified as an IEC LASER Class 1. The total power of light energy radiated out of the OPTICAL OUT connector is no greater than +8.1 dBm (6.5 mW). Operator maintenance or precautions are not necessary to maintain safety. No operator accessible controls, adjustments, or performance of procedures result in hazardous radiation exposure.
General Safety Considerations General Safety Considerations This product has been designed and tested in accordance with IEC Publication 61010-1, Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use, and has been supplied in a safe condition. The instruction documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition.
General Safety Considerations CAUTION Before switching on this instrument, make sure that the line voltage selector switch is set to the line voltage of the power supply and the correct fuse is installed. Assure the supply voltage is in the specified range. CAUTION This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 1010 and 664 respectively.
Contents The Agilent 83430A—At a Glance iii 1 Getting Started Step 1. Inspect the Shipment 1-4 Step 2. Check the Fuse 1-6 Step 3. Connect the Line-Power Cable 1-8 Step 4.
1 Step 1. Inspect the Shipment 1-4 Step 2. Check the Fuse 1-6 Step 3. Connect the Line-Power Cable 1-8 Step 4.
Getting Started Getting Started Getting Started The instructions in this chapter show you how to install your Agilent 83430A. You should be able to finish these procedures in about ten to twenty minutes. After you’ve completed this chapter, continue with Chapter 2, “Making Measurements”. Refer to Chapter 3, “Specifications and Regulatory Information” for information on operating conditions such as temperature. WARNING To prevent electric shock, disconnect the Agilent 83430A from mains before cleaning.
Getting Started Getting Started Measurement accuracy—it’s up to you! Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. The Agilent 83430A’s front-panel OPTICAL OUT connector is no exception. When you use improper cleaning and handling techniques, you risk expensive instrument repairs, damaged cables, and compromised measurements.
Getting Started Step 1. Inspect the Shipment Step 1. Inspect the Shipment 1 Verify that all components ordered have arrived by comparing the shipping forms to the original purchase order. Inspect all shipping containers. If your shipment is damaged or incomplete, save the packing materials and notify both the shipping carrier and the nearest Agilent Technologies service office.
Getting Started Step 1.
Getting Started Step 2. Check the Fuse Step 2. Check the Fuse CAUTION Before connecting the lightwave receiver to the power source, you must set the rear-panel voltage selector correctly to adapt the lightwave receiver to the power source. An improper selector setting can damage the Agilent 83430A when it is turned on. 1 Locate the line-input connector on the instrument’s rear panel. 2 Disconnect the line-power cable if it is connected.
Getting Started Step 2. Check the Fuse 6 Verify that the value of the line-voltage fuse is correct. • For 100/120V operation, use an IEC 127 5×20 mm, 0.315 A, 250 V, Agilent part number 2110-0449. • For 220/240V operation, use an IEC 127 5×20 mm, 0.16 A, 250 V, Agilent part number 2110-0448. WARNING For continued protection against fire hazard, replace line fuse only with same type and ratings, (type T 0.315A/250V for 100/120V operation and 0.16A/250V for 220/240V operation).
Getting Started Step 3. Connect the Line-Power Cable Step 3. Connect the Line-Power Cable CAUTION Always use the three-prong AC power cord supplied with this instrument. Failure to ensure adequate earth grounding by not using this cord may cause instrument damage. CAUTION Do not connect ac power until you have verified the line voltage is correct as described in the following paragraphs. Damage to the equipment could result. CAUTION This instrument has autoranging line voltage input.
Getting Started Step 3. Connect the Line-Power Cable 3 Connect the other end of the line-power cord to the power receptacle. Various power cables are available to connect the Agilent 83430A to ac power outlets unique to specific geographic areas. The cable appropriate for the area to which the Agilent 83430A is originally shipped is included with the unit. You can order additional ac power cables for use in different geographic areas. Refer to “Power Cords” on page 4-5.
Getting Started Step 4. Turn on the Agilent 83430A Step 4. Turn on the Agilent 83430A • Press the front-panel LINE key. The front-panel LINE switch disconnects the mains circuits from the mains supply after the EMC filters and before other parts of the instrument.
Getting Started Returning the Instrument for Service Returning the Instrument for Service The instructions in this section show you how to properly return the instrument for repair or calibration. Always call the Agilent Technologies Instrument Support Center first to initiate service before returning your instrument to a service office. This ensures that the repair (or calibration) can be properly tracked and that your instrument will be returned to you as quickly as possible.
Getting Started Returning the Instrument for Service information should be returned with the instrument. • Type of service required. • Date instrument was returned for repair. • Description of the problem: • Whether problem is constant or intermittent. • Whether instrument is temperature-sensitive. • Whether instrument is vibration-sensitive. • Instrument settings required to reproduce the problem. • Performance data. • Company name and return address. • Name and phone number of technical contact person.
Getting Started Returning the Instrument for Service Sealed Air Corporation (Commerce, California 90001). Air Cap looks like a plastic sheet filled with air bubbles. Use the pink (antistatic) Air Cap™ to reduce static electricity. Wrapping the instrument several times in this material will protect the instrument and prevent it from moving in the carton. 4 Seal the carton with strong nylon adhesive tape. 5 Mark the carton “FRAGILE, HANDLE WITH CARE”. 6 Retain copies of all shipping papers.
2 Using the Agilent 83430A 2-3 Front-panel Features 2-3 Example Uses 2-5 Cleaning Connections for Accurate Measurements Making Measurements 2-9
Making Measurements Making Measurements Making Measurements In this chapter, you’ll find examples of making measurements using the Agilent 83430A. The last section of this chapter explains how to maintain top performance of your instrument by using proper handling and cleaning techniques. Be sure to read this section before using your Agilent 83430A.
Making Measurements Using the Agilent 83430A Using the Agilent 83430A Front-panel Features The following paragraphs describe the Agilent 83430A front-panel features. LINE key Disconnects the mains circuit from the mains supply after the EMC filters and before other parts of the instrument. SELECT button Selects between three modulation inputs: ANALOG IN AC COUPLED, DIGITAL IN AC COUPLED, and DIGITAL IN DC COUPLED. Front panel lights come on to indicate which input is selected.
Making Measurements Using the Agilent 83430A DIGITAL IN (AC COUPLED) DIGITAL IN (DC COUPLED) Modulation input for digital signals. The input is AC coupled. BNC connector. Modulation input for analog signals. This input is DC coupled. BNC connector. WAVELENGTH ADJUST knob Allows you to adjust the laser’s wavelength when the variable mode is activated. Press the PRESET/ VARIABLE button so that the front-panel light turns on.
Making Measurements Using the Agilent 83430A Example Uses Testing optical receiver sensitivity You can use the Agilent 83430A to measure the minimum sensitivity of an optical receiver.
Making Measurements Using the Agilent 83430A .
Making Measurements Using the Agilent 83430A Testing dispersion power penalty Signal degradation due to fiber dispersion can have a major impact on the maximum distance over which optical data can reliably be sent. The dispersion power penalty of single-mode fiber can be tested with the measurement setup shown in the following figure.
Making Measurements Using the Agilent 83430A Testing jitter tolerance High-speed digital receivers are often required to receive or regenerate data using a clock signal that is recovered or extracted from the data waveform. Variation in the data rate, commonly known as jitter, can complicate the clock recovery and data regeneration process. A jitter tolerance test determines the ability of a receiver to maintain communication in the presence of jitter.
Making Measurements Cleaning Connections for Accurate Measurements Cleaning Connections for Accurate Measurements Today, advances in measurement capabilities make connectors and connection techniques more important than ever. Damage to the connectors on calibration and verification devices, test ports, cables, and other devices can degrade measurement accuracy and damage instruments.
Making Measurements Cleaning Connections for Accurate Measurements tions take repeatability uncertainty into account? • Will a connector degrade the return loss too much, or will a fusion splice be required? For example, many DFB lasers cannot operate with reflections from connectors. Often as much as 90 dB isolation is needed. Figure 2-1. Basic components of a connector. Over the last few years, the FC/PC style connector has emerged as the most popular connector for fiber-optic applications.
Making Measurements Cleaning Connections for Accurate Measurements Figure 2-2. Universal adapters to Diamond HMS-10. The HMS-10 encases the fiber within a soft nickel silver (Cu/Ni/Zn) center which is surrounded by a tough tungsten carbide casing, as shown in Figure 2-3. Figure 2-3. Cross-section of the Diamond HMS-10 connector. The nickel silver allows an active centering process that permits the glass fiber to be moved to the desired position.
Making Measurements Cleaning Connections for Accurate Measurements The soft core, while allowing precise centering, is also the chief liability of the connector. The soft material is easily damaged. Care must be taken to minimize excessive scratching and wear. While minor wear is not a problem if the glass face is not affected, scratches or grit can cause the glass fiber to move out of alignment. Also, if unkeyed connectors are used, the nickel silver can be pushed onto the glass surface.
Making Measurements Cleaning Connections for Accurate Measurements Use the following guidelines to achieve the best possible performance when making measurements on a fiber-optic system: • Never use metal or sharp objects to clean a connector and never scrape the connector. • Avoid matching gel and oils. Figure 2-4. Clean, problem-free fiber end and ferrule. Figure 2-5. Dirty fiber end and ferrule from poor cleaning.
Making Measurements Cleaning Connections for Accurate Measurements Figure 2-6. Damage from improper cleaning. While these often work well on first insertion, they are great dirt magnets. The oil or gel grabs and holds grit that is then ground into the end of the fiber. Also, some early gels were designed for use with the FC, non-contacting connectors, using small glass spheres. When used with contacting connectors, these glass balls can scratch and pit the fiber.
Making Measurements Cleaning Connections for Accurate Measurements • Keep connectors covered when not in use. • Use fusion splices on the more permanent critical nodes. Choose the best connector possible. Replace connecting cables regularly. Frequently measure the return loss of the connector to check for degradation, and clean every connector, every time. All connectors should be treated like the high-quality lens of a good camera.
Making Measurements Cleaning Connections for Accurate Measurements Visual inspection of fiber ends Visual inspection of fiber ends can be helpful. Contamination or imperfections on the cable end face can be detected as well as cracks or chips in the fiber itself. Use a microscope (100X to 200X magnification) to inspect the entire end face for contamination, raised metal, or dents in the metal as well as any other imperfections. Inspect the fiber for cracks and chips.
Making Measurements Cleaning Connections for Accurate Measurements Table 2-2. Dust Caps Provided with Lightwave Instruments Item Agilent Part Number Laser shutter cap 08145-64521 FC/PC dust cap 08154-44102 Biconic dust cap 08154-44105 DIN dust cap 5040-9364 HMS10/dust cap 5040-9361 ST dust cap 5040-9366 To clean a non-lensed connector CAUTION Do not use any type of foam swab to clean optical fiber ends. Foam swabs can leave filmy deposits on fiber ends that can degrade performance.
Making Measurements Cleaning Connections for Accurate Measurements CAUTION Do not shake, tip, or invert compressed air canisters, because this releases particles in the can into the air. Refer to instructions provided on the compressed air canister. 7 As soon as the connector is dry, connect or cover it for later use. If the performance, after the initial cleaning, seems poor try cleaning the connector again. Often a second cleaning will restore proper performance.
3 Specifications 3-3 Regulatory Information 3-6 Specifications and Regulatory Information
Specifications and Regulatory Information Specifications and Regulatory Information Specifications and Regulatory Information This chapter lists specification and characteristics of the instrument. The distinction between these terms is described as follows: • Specifications describe warranted performance over the temperature range 0°C to +45°C and relative humidity <95% (unless otherwise noted).
Specifications and Regulatory Information Specifications Specifications Table 3-1. Center Wavelength Option Center Wavelength Option Center Wavelength Standard 1550 ±1 nm 462 1546.2 ±1 nm 130 1310 ±20 nm 469 1546.92 ±1 nm 327 1532.68 ±1 nm 477 1547.72 ±1 nm 335 1533.47 ±1 nm 485 1548.51 ±1 nm 343 1534.25 ±1 nm 493 1549.32 ±1 nm 350 1535.04 ±1 nm 501 1550.12 ±1 nm 358 1535.82 ±1 nm 509 1550.92 ±1 nm 366 1536.61 ±1 nm 517 1551.72 ±1 nm 374 1537.40 ±1 nm 525 1552.
Specifications and Regulatory Information Specifications Table 3-2. General Specifications Eye Mask Performance Conforms to GR-253 and ITU G.957 requirements at OC-1, OC-3/STM-1, OC-12/STM-4, OC-48/STM-16 Wavelength Adjustment Range (over 25 ±10°C ambient temperature range) ±1.25 nm (±1.8 nm typical) Extinction Ratio (over 25 ±10°C ambient, measured at OC-48/STM-16 rate in instrument preset condition) 10 dB ±1 dB Bias/Extinction Ratio Adjustment Range (characteristic) <8.
Specifications and Regulatory Information Specifications Table 3-3. Input Modulation DIGITAL IN AC COUPLED DIGITAL IN DC COUPLED ANALOG IN AC COUPLED Maximum Input Level Bit Rate 2 V p-p 50 to 2500 Mb/s a –4.5 to 0 V DC to 2500 Mb/s 2 V p-p 0.1 to 2500 MHz (3 dB bandwidth) Pulse Pattern (characteristic) Polarity Input Level 40 to 60% ones density 0 to 100% ones density Non-inverting 0.7 to 1.5 V p-p Non-inverting –1.7 V low, –0.
Specifications and Regulatory Information Regulatory Information Regulatory Information • Laser Classification: This product contains an IEC LASER Class 1. • This product complies with 21 CFR 1040.10 Class 1, IEC 825-1 Class 1. • This product is designed for use in INSTALLATION CATEGORY II and POLLUTION DEGREE 2, per IEC 1010 and 664 respectively.
Specifications and Regulatory Information Regulatory Information 3-7
4 Options 4-2 Front-Panel Fiber-Optic Adapters 4-4 Power Cords 4-5 Agilent Technologies Service Offices 4-6 Reference
Reference Options Options Table 4-1. Center Wavelength Options Option Center Wavelength Option Center Wavelength Standard 1550 ±1 nm 462 1546.2 ±1 nm 130 1310 ±20 nm 469 1546.92 ±1 nm 327 1532.68 ±1 nm 477 1547.72 ±1 nm 335 1533.47 ±1 nm 485 1548.51 ±1 nm 343 1534.25 ±1 nm 493 1549.32 ±1 nm 350 1535.04 ±1 nm 501 1550.12 ±1 nm 358 1535.82 ±1 nm 509 1550.92 ±1 nm 366 1536.61 ±1 nm 517 1551.72 ±1 nm 374 1537.40 ±1 nm 525 1552.52 ±1 nm 382 1538.19 ±1 nm 533 1553.
Reference Options Table 4-2.
Reference Front-Panel Fiber-Optic Adapters Front-Panel Fiber-Optic Adapters Front Panel Fiber-Optic Adapter Description Agilent Part Number Diamond HMS-10 81000AI FC/PCa 81000FI D4 81000GI SC 81000KI DIN 81000SI ST 81000VI Biconic 81000WI Dust Covers FC connector 1005-0594 Diamond HMS-10 connector 1005-0593 DIN connector 1005-0595 ST connector 1005-0596 SC connector 1005-0597 a. The FC/PC adapter is the standard adapter supplied with the instrument.
Reference Power Cords Power Cords Plug Type Cable Part No.
Reference Agilent Technologies Service Offices Agilent Technologies Service Offices Before returning an instrument for service, call the Agilent Technologies Instrument Support Center at (800) 403-0801, visit the Test and Measurement Web Sites by Country page at http://www.tm.agilent.com/tmo/country/English/ index.html, or call one of the numbers listed below. Agilent Technologies Service Numbers Austria 01/25125-7171 Belgium 32-2-778.37.
5 General Information 5-4 Electrostatic Discharge Information 5-7 Troubleshooting 5-9 If the output power is low 5-10 To check the line-power fuse 5-11 Performance Tests 5-13 Test 1. Digital Threshold 5-15 Test 2. Frequency Response (ANALOG IN) 5-17 Test 3. Electrical Return Loss (ANALOG IN) 5-20 Test 4. Electrical Return Loss (DIGITAL IN) 5-22 Test 5. Eye Quality (DIGITAL IN) 5-24 Test 6. STM-16/OC-48 Conformance 5-26 Test 7. OC-1 Conformance 5-28 Test 8. Output Power 5-31 Test 9.
Servicing Servicing Servicing In this chapter, you'll find information on troubleshooting, testing performance, adjusting, and replacing parts in the instrument. WARNING The laser assembly, A2A1, in this instrument is not field serviceable. Safety first! Before servicing the Agilent 83430A, familiarize yourself with the safety markings on the instrument and the safety instructions in this manual. This instrument has been manufactured and tested according to international safety standards.
Servicing Servicing WARNING For continued protection against fire hazard, replace line fuse only with same type and ratings, (type T 0.315A/250V for 100/120V operation and 0.16A/250V for 220/240V operation). The use of other fuses or materials is prohibited. WARNING Use of controls or adjustment or performance of procedures other than those specified herein may result in hazardous radiation exposure.
Servicing General Information General Information Whenever you contact Agilent Technologies about your Agilent 83430A, have the complete serial number and option designation available. This will ensure you obtain accurate service information. • Refer to Table 5-1 for a list of internal labels. • Refer to Table 5-2 on page 5-5 for a list of service tools. • Refer to “Major Assemblies and Cables” on page 5-5 for the location of each major assembly and cable. Clean the cabinet using a damp cloth only.
Servicing General Information Table 5-2. Service Tools Tool Agilent Part Number Small Pozidriv screwdriver 8710-0899 Wire cutter 8710-0012 Long-nose pliers 8710-1107 5.5 mm nut driver 8710-1220 7 mm nut driver 8710-1217 TORX T-10 driver 8710-1623 TORX T-15 driver 8710-1622 Table 5-3.
Servicing General Information 5-6
Servicing Electrostatic Discharge Information Electrostatic Discharge Information Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic assemblies should be performed at a static-safe work station. The following figure shows an example of a static-safe work station using two types of ESD protection: • Conductive table-mat and wrist-strap combination. • Conductive floor-mat and heel-strap combination.
Servicing Electrostatic Discharge Information To ensure user safety, the static-safe accessories must provide at least 1 MΩ of isolation from ground. Refer to Table 5-4 for information on ordering staticsafe accessories. WARNING These techniques for a static-safe work station should not be used when working on circuitry with a voltage potential greater than 500 volts. Table 5-4. Static-Safe Accessories Agilent Part Number Description 9300-0797 3M static control mat 0.6 m × 1.2 m (2 ft× 4 ft) and 4.
Servicing Troubleshooting Troubleshooting The following procedures are located in this section: If the output power is low 5-10 To check the line-power fuse 5-11 WARNING The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the instrument from all voltage sources while it is being opened. WARNING The power cord is connected to internal capacitors that may remain live for five seconds after disconnecting the plug from its power supply.
Servicing Troubleshooting If the output power is low Check for the following common problems: ❒ Clean the OPTICAL OUT connector as described in “Cleaning Connections for Accurate Measurements” on page 2-9. ❒ Perform the adjustment procedures.
Servicing Troubleshooting To check the line-power fuse 1 Locate the line-input connector on the instrument’s rear panel. 2 Disconnect the line-power cable if it is connected. 3 Use a small flat-blade screwdriver to pry open the fuse holder door. CAUTION You must remove the voltage tumbler to change the voltage selector. Rotating the voltage tumbler while it is in the line module damages the line module.
Servicing Troubleshooting 5-12
Servicing Performance Tests Performance Tests The procedures in this section test the Agilent 83430A’s performance using the specifications listed in Chapter 3, “Specifications and Regulatory Information” as the performance standard. All of the tests are done manually without the aid of a computer. None of these tests require access to the interior of the instrument. Allow the Agilent 83430A to warm up for 15 minutes before doing any of the performance tests.
Servicing Performance Tests Table 5-5. Required Test Equipment Equipment Agilent Recommended Model Optical spectrum analyzer 71450B Equipment substitution not recommended. Wavelength accuracy must be ±0.5 nm or better. Digital voltage meter 34401A ≥150 Vdc range. 1 mV accuracy. Digitizing oscilloscope 83480A with 83483A and 83485A ≤10 ps/div amplitude scale ≥500 MHz triggering, optical input with built-in SDH filter. Critical Specifications >10 GHz bandwidth Voltage and time histograms.
Servicing Performance Tests Test 1. Digital Threshold 1 Connect the equipment as shown in the following figure. Figure 5-1.
Servicing Performance Tests 2 Set the pattern generator to the following settings. For step-by-step instructions on setting these values, refer to “Configuring the pattern generator” on page 5-35. data pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223–1 data amplitude (ECL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV p-p data output high level (ECL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Performance Tests Test 2. Frequency Response (ANALOG IN) This performance test checks the 80% modulation level and the frequency response at that level. 1 Connect the equipment as shown in the following figure. Figure 5-2. Equipment setup 2 Set the pattern generator to the following settings.
Servicing Performance Tests generator” on page 5-35. data pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223–1 data amplitude (ECL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV p-p data output high level (ECL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –900 mV data termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V trigger mode . .
Servicing Performance Tests Figure 5-3. Equipment setup 16 Press the PRESET key on the Agilent 8752C network analyzer. 17 Set the Agilent 8752C to the following settings: RF output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 dBm amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 dB/division start frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.
Servicing Performance Tests Test 3. Electrical Return Loss (ANALOG IN) This procedure measures the electrical return loss for this connection when the drive level is less than the power required for 80% modulation. 1 Press the PRESET key on the Agilent 8752C network analyzer. Figure 5-4. Calibration kit connections 2 With averaging on, calibrate the Agilent 8752C for a 1-port reflection measurement at the end of the RF output cable. Use the calibration termination kit.
Servicing Performance Tests 4 Set the Agilent 8752C to the following settings: RF output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 dBm amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 dB/division start frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 MHz stop frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Performance Tests Test 4. Electrical Return Loss (DIGITAL IN) 1 Press the PRESET key on the Agilent 8752C network analyzer. 2 With averaging on, calibrate the Agilent 8752C for a 1-port reflection measurement at the end of the RF output cable. Use the calibration termination kit. A through calibration is not required. 3 Connect the equipment as shown in the following figure. Figure 5-6.
Servicing Performance Tests 10 Confirm that the return loss meets the following requirements: ≤ 1.0 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >12.07 dB 1 GHz to 2 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >9.07 dB 2 GHz to 2.5 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >6.07 dB 11 Disconnect the Agilent 8752C from the Agilent 83430A.
Servicing Performance Tests Test 5. Eye Quality (DIGITAL IN) This test checks the quality of the eye diagram with a modulation rate of 2.48832 Gb/s. 1 Connect the equipment as shown in the following figure. Figure 5-7.
Servicing Performance Tests 2 Set the pattern generator to the following settings. For step-by-step instructions on setting these values, refer to “Configuring the pattern generator” on page 5-35. data pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223–1 data amplitude (ECL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .850 mV p-p data output high level (ECL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Performance Tests Test 6. STM-16/OC-48 Conformance 1 Connect the equipment as shown in the following figure. Figure 5-8. Equipment setup for eye quality 2 Set the pattern generator to the following settings. For step-by-step instructions on setting these values, refer to “Configuring the pattern generator” on page 5-35. data pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223–1 data amplitude (ECL). . . . . . . . . . . . . . . . . . . .
Servicing Performance Tests 3 Turn the Agilent 83430A on, and press both front-panel PRESET/VARIABLE buttons so that the WAVELENGTH ADJUST and BIAS ADJUST lights are off. 4 On the Agilent 83480A digital communications analyzer, adjust the amplitude scale, time scale, and offsets as needed. 5 Adjust the Agilent 83430A’s front-panel DIGITAL THRESHOLD knob so that a zero crossing occurs at center screen (approximate 50% crossing).
Servicing Performance Tests Test 7. OC-1 Conformance 1 Connect the equipment as shown in the following figure. Figure 5-9.
Servicing Performance Tests 2 Set the pattern generator to the following settings. For step-by-step instructions on setting these values, refer to “Configuring the pattern generator” on page 5-35. data pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223–1 data amplitude (ECL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .850 mV p-p data output high level (ECL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Performance Tests 14 Press Run Until, and wait for 300 waveforms to be processed. 15 Press the blue shift key and then press Eye mask to display the eye mask results.Verify that there are no mask or margin hits.
Servicing Performance Tests Test 8. Output Power 1 Connect the Agilent 83430A’s OPTICAL OUT connector to a optical power meter. 2 Disconnect any cables connected to the Agilent 83430A’s ANALOG IN or DIGITAL IN input connectors. 3 Turn the Agilent 83430A on, and press the front-panel PRESET/VARIABLE button so that the BIAS ADJUST light is off. 4 Press the Agilent 83430A’s front-panel SELECT key repeatedly until the DIGITAL IN DC COUPLED light is on. 5 Verify that the optical output power measures 10.
Servicing Performance Tests f Press more 3 of 3, more 1 of 3, and then set pat label. g Use the displayed softkeys to create a label to identify this new pattern. It will minimize confusion as you use the pattern generator. Enter the suggested label ALL ONES. Press FINISH ENTRY when you have finished entering all the letters in the label. h Press more 2 of 3, more 3 of 3, save pattern, and then INTERNL PATT 1. i Press the left-side select pattern softkey. j Press user pattern and then INTERNL PATT 1.
Servicing Performance Tests Test 9. Output Wavelength 1 Connect the equipment as shown in the following figure. Figure 5-10. Equipment setup for output wavelength 2 Turn on the Agilent 83430A and the optical spectrum analyzer, and allow them to warm up for 30 minutes. 3 Perform a user wavelength calibration of the optical spectrum analyzer as described in the User’s Guide for the optical spectrum analyzer. 4 Disconnect any cables connected to the Agilent 83430A’s ANALOG IN or DIGITAL IN input connectors.
Servicing Performance Tests 9 Verify that the measured wavelength is within 1 nm of the Agilent 83430A’s nominal value. If the Agilent 83430A is an Option 130, the wavelength must be within 20 nm of the nominal value.
Servicing Performance Tests Configuring the pattern generator This procedure shows you, step-by-step, how to configure the Agilent 70841B pattern generator settings for the performance tests and adjustment procedures. It is assumed, that the Agilent 70311A clock source is configured in the modular measurement system (MMS) mainframe as a slave to the pattern generator module. This allows you to change the clock source’s frequency from the pattern generator.
Servicing Adjustment Procedures Adjustment Procedures Perform the adjustments in this section if the instrument fails any of its performance tests. Periodic adjustment is not required to maintain safety. The following adjustment procedures are provided in this section: To remove the instrument cover 5-38 Adjustment 1. Power Supply 5-39 Adjustment 2. Laser Bias and Control 5-41 WARNING Improper internal adjustments may change the laser classification of this instrument.
Servicing Adjustment Procedures Table 5-6. Required Test Equipment Agilent Recommended Model Critical Specifications Digital voltage meter 34401A ≥150 Vdc range. 1 mV accuracy. Digitizing oscilloscope 83480A with 83483A and 83485A ≤10 ps/div amplitude scale ≥500 MHz triggering, optical input with built-in SDH filter. Equipment >10 GHz bandwidth Voltage and time histograms. Built-in SONET/SDH eye mask conformance test. Pattern generator 70841B 0.1 to 3.3 Gb/s, 223–1 PRBS.
Servicing Adjustment Procedures To remove the instrument cover CAUTION Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic assemblies should be performed at a static-safe work station. Refer to “Electrostatic Discharge Information” on page 5-7 for more information on preventing ESD. 1 Disconnect the power cord from the instrument. 2 Position the instrument so that you are looking at the rear panel.
Servicing Adjustment Procedures Adjustment 1. Power Supply In this procedure, you’ll adjust both the –12V and +12V supplies. These supplies are located on the A3 Power Supply Assembly. Because the +5V ADJ potentiometer is not used in this instrument, it is not adjusted. 1 Connect the line-power cord to the Agilent 83430A’s rear panel connector. 2 Turn on the Agilent 83430A. 3 Measure the dc voltage between the –OUT (violet wire) and +OUT (black wire) terminals located on the A3 assembly.
Servicing Adjustment Procedures Figure 5-11.
Servicing Adjustment Procedures Adjustment 2. Laser Bias and Control 1 Locate each adjustment potentiometer shown in the following figure. Turn each potentiometer fully counterclockwise. Figure 5-12.
Servicing Adjustment Procedures 2 Connect an optical power meter to the Agilent 83430A’s front-panel OPTICAL OUT connector. Use a good quality optical fiber (9/125 µm) and make sure the fiber is clean before connecting. 3 Turn the Agilent 83430A on, and press both front-panel PRESET/VARIABLE buttons so that the WAVELENGTH ADJUST and BIAS ADJUST lights are off. 4 Press the SELECT key repeatedly until the DIGITAL IN DC COUPLED light is on.
Servicing Adjustment Procedures j Press user pattern and then INTERNL PATT 1. 8 Adjust the ECL –1 ADJ potentiometer so that the optical power measures +1.5 dBm. 9 On the pattern generator, press the left-side select pattern softkey. 10 Press the 2 23–1 softkey. 11 Locate the test points that are labeled “P4” on the A2 Main Board Assembly. Measure the voltage across pins 15 and 16 (LOOP test points).
Servicing Adjustment Procedures 17 Connect the equipment as shown in the following figure. Figure 5-13. Equipment setup for laser bias 18 Turn the Agilent 83430A’s LINE switch on, and clear the Agilent 83480A’s display. 19 On the Agilent 83430A, press the PRESET/VARIABLE button so that the BIAS ADJUST light is off. 20 On the Agilent 83480A digital communications analyzer, perform the following steps: a Turn the optical channel on. Turn off all other channels. b Enable the internal OC-48 filter.
Servicing Adjustment Procedures e Press Continue to activate the color grade. f Press Dark cal, and follow the instructions on the screen. g When the dark calibration is complete, press Format to select decibels. h Press Enter to complete the measurement setup. 21 On the Agilent 83430A, press the front-panel PRESET/VARIABLE button so that the BIAS ADJUST light is on. 22 Turn the Agilent 83430A’s front-panel BIAS ADJUST knob fully clockwise.
Index A AC COUPLED connector, 2-3 ac power cables, 1-9, 4-5 accessories static-safe, 5-8 accuracy, measurement, iv adapters, 2-4 fiber optic, 4-4 adjustable features, iii adjusting output amplitude, 2-4 wavelength, 2-4 adjustment procedures, 5-36 instrument cover removal, 5-38 laser bias and control, 5-41 power supply, 5-39 required test equipment, 5-37 adjustment range bias/extinction ratio, 3-4 wavelength, 3-4 Agilent offices, 4-6 amplitude, adjusting output, 2-4 ANALOG IN connector, 2-3 electrical retur
Index DIGITAL IN performance test, 5-22 ESD (electrostatic discharge), 5-4, 5-7, 5-38 extinction ratio adjustment range, 3-4 measurement, 5-27, 5-29, 5-45 optical signals, iii specification, 3-4 eye diagram performance test, 5-24 zero crossing, 5-16 eye mask measurement, 5-30 eye quality, 5-26 DIGITAL IN performance test, 5-24 F features, user adjustable, iii fiber optics adapters, 2-4, 4-4, 5-18 care of, iv cleaning connections, 2-9 connectors, covering, 1-12 filter, OC-48, 5-18 foam swabs, 2-16 frequenc
Index N noise declaration, 3-6 noise, relative intensity, 3-4 preset wavelength, 2-4 PRESET/VARIABLE, 2-4 R O OC-1 conformance performance test, 5-28 OC-48 filter, 5-18, 5-25, 5-44 OC-48/STM-16 conformance performance test, 5-26 one-port reflection measurement, 5-20, 5-22 operating specifications, 3-5 optical level symmetry, iii OPTICAL OUT connector, iv–v, 1-3, 5-10 optical output power level, 5-32 measurement, 5-31 optical receiver sensitivity, 2-5 optical signal, extinction ratio, iii options, 4-3 out
Index side-mode suppression ratio, 3-4 spare fuse, 1-6, 5-11 specifications center wavelength, 3-3 definition of terms, 3-2 general, 3-4 operating, 3-5 spectral width, 3-4 static-safe accessories, 5-8 STM-16/OC-48 conformance performance test, 5-26 storage temperature, 3-5 suppression ratio, side-mode, 3-4 swabs, 2-16 system test capabilities, iv T test capabilities of system, iv test equipment adjustment procedures, 5-37 performance tests, 5-14 threshold, digital input, iii tools for servicing, 5-4 trigg
