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VCF050&100 Series User Manual
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VCF050&100 Series User Manual

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    VCF050&100 Series User Manual VCF050&100 Series User Manual Document Transcript

    • VCF050/100 Series User’s Manual Controller User’s Manual Draft Revision 2.0 Security Warning: This document, and its contents, is proprietary and confidential to JDS Uniphase Corporation, or its subsidiaries and affiliates. Neither this document, nor any part of it, may be disclosed or conveyed to, used or copied by or for, any third party without the prior written consent of JDS Uniphase Corporation. © 2002 JDS Uniphase Corporation. All rights reserved.
    • VCF050/100 User’s Manual Page 2 of 20 JDS Uniphase Confidential Table of Contents 1 INTRODUCTION ...........................................................................................................................3 1.1 OPTICS ....................................................................................................................................4 1.2 FILTER ELEMENT.......................................................................................................................4 1.3 KEY FEATURES .........................................................................................................................4 1.4 APPLICATIONS ..........................................................................................................................5 1.5 STANDARD ACCESSORIES ..........................................................................................................5 2 SPECIFICATIONS..........................................................................................................................6 2.1 OPTICAL ..................................................................................................................................6 2.2 ENVIRONMENTAL.......................................................................................................................7 2.3 MECHANICAL AND PACKAGING ....................................................................................................7 2.4 MECHANICAL DRAWINGS............................................................................................................8 3 GETTING STARTED......................................................................................................................9 3.1 BEFORE INITIALIZING AND OPERATING THE UNIT ...........................................................................9 3.2 INITIAL INSPECTION ...................................................................................................................9 3.3 OPERATING ENVIRONMENT ........................................................................................................9 3.3.1 Temperature...................................................................................................................9 3.3.2 Humidity.........................................................................................................................9 3.4 STORING AND SHIPPING........................................................................................................... 10 3.4.1 Claims and Repackaging.............................................................................................. 10 3.4.2 Returning Shipments to JDS Uniphase......................................................................... 10 3.5 CLEANING CONNECTORS ......................................................................................................... 12 4 INSTALLING THE VCF050/100.................................................................................................... 13 4.1 DETERMINING CONNECTOR PIN ASSIGNMENT............................................................................. 13 4.2 USING PIN ASSIGNMENTS FOR THE STEPPER MOTOR CONTROL................................................... 14 4.3 MOUNTING THE VCF050/100 ON A PCB ................................................................................... 15 5. OPERATING AND MAINTENANCE INSTRUCTIONS.................................................................. 16 5.1 DETERMINING THE POSITION OF THE VCF FILTER....................................................................... 16 5.2 USING STEPPER MOTOR DRIVERS ............................................................................................ 17 5.2.1 H-Switch Driver ............................................................................................................ 17 5.2.2 Controller Driver ........................................................................................................... 17 5.3 USING HARDWARE PROTECTION............................................................................................... 18 6 CALIBRATION AND MAINTENANCE .......................................................................................... 19 7 CONTACT INFORMATION .......................................................................................................... 20 8 REVISION HISTORY.................................................................................................................... 21
    • VCF050/100 User’s Manual Page 3 of 20 JDS Uniphase Confidential 1 Introduction This user’s manual for the VCF050 and VCF100 Series Voltage-Controlled Optical Filter contains complete operating instructions. The JDS Uniphase VCF050/100 series of voltage-controlled tunable band pass filter (patent pending) can be used for amplified spontaneous emission (ASE) suppression of optical signals, and also for single-channel demultiplexing from a multichannel dense wavelength division multiplexing (DWDM) optical signal stream. The VCF can also be used in flexible and dynamic wavelength optical add/drop applications. The VCF is designed to be Telcordia GR 1209 and 1221 compliant and uses hermetic sealing for increased resistance to environmental extremes. The VCF offers excellent optical performance in both C and L bands. The center wavelength selection is precisely tuned using a stepper motor driven by an external integrated circuit driver. The driver moves the filter up and down in uniform steps in the center wavelength to provide high resolution. The VCF is compact in size and can easily be mounted on a printed circuit board (PCB). The VCF requires minimum voltage. The pins extrude from the side of the package to provide better soldering and inspection. The transmission spectrum of the VCF is optimized for low insertion loss, high rejection, and low chromatic dispersion. Figure 1: VCF050 Tunable Filter
    • VCF050/100 User’s Manual Page 4 of 20 JDS Uniphase Confidential 1.1 Optics The optics design is based on JDS Uniphase’s high performance gradient index (GRIN) lens-fiber coupling technology, which has excellent field-proven reliability. The filter is optimized for the C band (1525 to 1570 nm) or L band (1565 to 1610 nm). Figure 2 shows the equivalent optical circuit for the VCF filter. IN OUT filter Figure 2: VCF Optics Both the input and output fibers are 9/125 µm single-mode fiber. 1.2 Filter Element The VCF050 and VCF100 use a linear variable filter (LVF) as the tunable filter element, a technology that provides excellent performance and reliability. The LVF is a standard multi-cavity DWDM filter comprised of alternating reflective and cavity layers. The distinguishing feature of the LVF is that all the layers have a slight wedge in the longitudinal direction. This shifts the resonant frequency of the LVF depending upon the longitudinal position of the incident beam. 1.3 Key Features • 50 and 100 GHz tunable filters for the C or L band • High adjacent and non-adjacent channel rejection • Good wavelength setting accuracy • Low insertion loss • Low chromatic dispersion • Wide tuning range • Low tuning voltage • Pins extruding from the side of the package • Mountable on PCB with small footprint • Pins extruding from side of the package • Mountable on a printed circuit board (PCB) with small footprint
    • VCF050/100 User’s Manual Page 5 of 20 JDS Uniphase Confidential 1.4 Applications • ASE suppression for optical fiber amplifiers (OFAs) and tunable lasers or receivers • Signal demultiplexers for wavelength division multiplexers (WDMs) or 1×N splitters • Dynamic wavelength selection associated with WDM systems using optical add/drops and flexible wavelength conversion 1.5 Standard Accessories • Calibration data (potentiometer voltages vs ITU channels) • User’s manual
    • VCF050/100 User’s Manual Page 6 of 20 JDS Uniphase Confidential 2 Specifications All specifications are excluding connectors, over operating temperature range of –5 to 70°C, over wavelength tuning range of 1525 to 1570 nm or 1565 to 1610 nm, and all polarization states. 2.1 Optical Parameter Condition Specification Units VCF Variant 50 GHz 100 GHz Min Typ Max Min Typ Max C-band (optimized) 1525 1570 1525 1570 nmOptimized wavelength range L-band (optimized) 1565 1610 1565 1610 nm BW @-0.5 dB 15 25 GHz BW @-1 dB 20 30 GHz BW @-3 dB 35 70 GHz Bandwidth BW @-20 dB 84 160 GHz Out of band rejection -40 -40 dB -1 dB bandwidth variation over tuning range ±5 ±5 % Insertion loss 3.0 3.0 dB Insertion loss variation over tuning range 0.5 0.5 dB Wavelength setting accuracy −4 ±2 +4 −5 ±3 +5 GHz Potentiometer frequency backlash 2 2 GHz Stepper motor frequency backlash 2 2 GHz Polarization dependent loss Over ±12 GHz from ƒctr 0.25 0.20 GHz Polarization mode dispersion Over ±12 GHz from ƒctr 0.2 0.2 ps Group delay dispersion Over ±12 GHz from ƒctr −50 ±20 +50 −20 ±15 +20 ps/nm Return loss 40 40 dB Settling time 30 30 ms Tuning speed Considering full travel over optimized tuning range using 400 Hz drive frequency upon stepper motor. 5000 5000 ms Wear 1.2 1.2 ×10 5 nm Fiber type Core/cladding/tubing SMF-28 1 with 9/125/900 or 9/125/250 µm Single-channel 10 10 dBmOptical power All channels 23 23 dBm 1 SMF-28 is a registered trademark of Corning Incorporated.
    • VCF050/100 User’s Manual Page 7 of 20 JDS Uniphase Confidential 2.2 Environmental Parameter Condition Specification Units VCF Variant 50 GHz 100 GHz Min Typ Max Min Typ Max Operating temperature −5 +70 −5 +70 °C Storage temperature Less than 48 consecutive hours −40 +85 −40 +85 °C Humidity Hermetic 5 95 5 95 % 2.3 Mechanical and Packaging Parameters Conditions Specifications Units VCF Variant All Fiber type SMF-28 of equivalent Dimensions W × H × D. Height includes standoffs. 25 × 12 × 50 mm Weight Not including connectors. Not including shipment package. 50 g 2.4 Step Motor Characteristics Parameter Condition Specification Units VCF Variant All Min Nominal Max Motor type 40 steps per revolution Step motor (2 phase) Recommended DC control voltage Full step mode – both coils energized 3.0 3.3 VDC Motor resistance Per phase 17 21 Ω Motor inductance Per phase (up to 1 KHz) 15 mH Motor current With both phases ON and 3.3 V applied per phase. 170 mA Back EMF amplitude 2.25 V/kstep/s Power consumption 100% duty cycle up to 40°C, then derate at 2%/°C duration (Period = 1 minute) 1.5 W 2.5 Potentiometer Characteristics Parameter Condition Specification Units VCF Variant All Min Nominal Max Total resistance Measured between POT+ to POT− 8 12 KΩ Power dissipation With 10 VDC applied and with 8 KΩ potentiometer resistance 12.5 mW Wiper current 1 mA
    • VCF050/100 User’s Manual Page 8 of 20 JDS Uniphase Confidential 2.6 Mechanical Drawings The dimensions (in [mm]) of the VCF with side pin-out are given. Side and top views are provided in Figures 3. Figure 3: VCF050/100 Filter Schematic for side pin-out package Caution The leads shown in DETAIL A are 0.38 mm wide, spaced 2 mm apart, and the 0.1 mm is BELOW the bottom surface, to ensure contact with the board. The tip of the pins are 4.76 mm away from the side of the package, and the solder surface is 1.8 mm long. 50 A DETAIL A 0.1 #2-56 UNC (3)PLACES 2 25 14 O 5 2 9 5 30 6 3 3 5 19 3 44 3 4 3
    • VCF050/100 User’s Manual Page 9 of 20 JDS Uniphase Confidential 3 Getting Started The VCF Series Voltage-Controlled Optical Filter package consists of the optical filter unit. 3.1 Before Initializing and Operating the Unit Inspect the unit for any signs of damage. Read the user’s manual thoroughly, and become familiar with all safety symbols and instructions to ensure that the unit is operated and maintained safely. 3.2 Initial Inspection Warning To avoid electrical shock, do not initialize or operate the unit if it bears any sign of damage to any portion of its exterior surface, such as the outer cover or panels. Check that the unit and contents are complete: 1. Wear an anti-static wrist strap, and work in an electrostatic discharge (ESD) controlled area. 2. Inspect the shipping container for any indication of excessive shock to the contents, and inspect the contents to ensure that the shipment is complete. 3. Inspect the unit for structural damage that can have occurred during shipping. 4. Keep the packaging. Immediately inform JDS Uniphase and, if necessary, the carrier if the contents of the shipment are incomplete, if the unit or any of its components are damaged or defective, or if the unit does not pass the initial inspection. 3.3 Operating Environment In order for the unit to meet the warranted specifications, the operating environment must meet the following conditions for temperature and humidity. 3.3.1 Temperature The unit can be operated in the temperature range of -5 to 70 °C. 3.3.2 Humidity The VCF Series is designed to meet Telcordia standards GR-1209-CORE and GR- 1221-CORE. The unit should not be exposed to any environmental conditions or changes to environmental conditions that can cause condensation to form inside the unit.
    • VCF050/100 User’s Manual Page 10 of 20 JDS Uniphase Confidential Warning • Do not use the unit outdoors. • To prevent potential fire or shock hazard, do not expose the unit to any source of excessive moisture. 3.4 Storing and Shipping To maintain optimum operating reliability, do not store the unit in locations where the temperature falls below -40 °C or rises above 85 °C. Avo id any environmental condition that can result in internal condensation. Ensure that these temperature and humidity requirements can also be met whenever the unit is shipped. 3.4.1 Claims and Repackaging Immediately inform JDS Uniphase and, if necessary, the carrier, if • The contents of the shipment are incomplete • The unit or any of its components are damaged or defective • The unit does not pass the initial inspection In the event of carrier responsibility, JDS Uniphase will allow for the repair or replacement of the unit while a claim against the carrier is being processed. 3.4.2 Returning Shipments to JDS Uniphase JDS Uniphase only accepts returns for which an approved Return Material Authorization (RMA) has been issued by JDS Uniphase sales personnel. This number must be obtained prior to shipping any material to JDS Uniphase. The owner’s name and address, the model number and full serial number of the unit, the RMA number, and an itemized statement of claimed defects must be included with the return material. Ship return material in the original shipping container and packing material. If these are not available, packaging guidelines are as follows: 1. Wear an anti-static wrist strap and work in an ESD controlled area. 2. Wrap the unit in anti-static packaging. Use anti-static connector covers, if applicable. 3. Pack the unit in a reliable shipping container. 4. Use enough shock-absorbing material (10 to 15 cm or 4 to 6 in on all sides) to cushion the unit and prevent it from moving inside the container. Pink poly anti- static foam is the best material. 5. Seal the shipping container securely. 6. Clearly mark FRAGILE on its surface. 7. Always provide the model and serial number of the unit and, if necessary, the RMA number on any accompanying documentation.
    • VCF050/100 User’s Manual Page 11 of 20 JDS Uniphase Confidential 8. Ship the unit only to the address given at the beginning of this document.
    • VCF050/100 User’s Manual Page 12 of 20 JDS Uniphase Confidential 3.5 Cleaning Connectors Caution • Connecting damaged or dirty fibers to the unit can damage the connectors on the unit. • Never force an optical connector. Some connectors have a ceramic ferrule that can easily be broken. Optical cable ends need to be cleaned before using them with the unit. The following items are required for cleaning: • Filtered compressed air or dusting gas (for example, Tech Spray Envi-Ro-Tech Duster 1671 gas, available from http://www.techspray.com/1671.htm) • Lint-free pipe cleaners (for example, from 3M1 ) or lint-free swab • Lint-free towels (for example, 10 x 10 cm or 4 x 4 in HydroSorb III wipers, available from: http://www.focenter.com/acctech/hydrosobr_wipers.htm) • Optical grade isopropyl alcohol or optical grade 200° e thanol (do not use rubbing alcohol, which contains 30% water) To clean the connectors: 1. Blow the sleeve with filtered compressed air (Figure 4). Figure 4: Connector Cleaning (connector type can vary) 2. Apply optical grade isopropyl alcohol or optical grade ethanol (do not use rubbing alcohol) to a small area of a lint-free towel and rub the end of the ferrule over the wet area. 3. Wipe the ferrule on a dry area of the lint-free towel. 4. Using the dusting gas or compressed air, blow the end of the ferrule. 5. Apply the alcohol or ethanol to a lint-free pipe cleaner or swab and wipe off the remaining parts of the connector. 6. With the other end of the pipe cleaner or swab, dry the areas cleaned. 7. Using the dusting gas or compressed air, blow the areas cleaned. 1 3M is a trademark of 3M.
    • VCF050/100 User’s Manual Page 13 of 20 JDS Uniphase Confidential 4 Installing the VCF050/100 The basic procedure for installing a VCF050/100 is to connect the unit to an appropriate controller according to the pin assignments and to connect the IN and OUT (optical) ports (Figure 5). Mechanical installation details are contained Figure 3. VCF Filter CASE GROUND [Pin No.8] POT− [PinNo.7] POTWIPER [PinNo.5] POT + [Pin No.6] MOTORA+ [Pin No.4] MOTORB −[Pin No.3] MOTORB +[Pin No.2] MOTORA −[Pin No.1] STEPPERMOTOR POTENTIOMETER OPTICS IN OUT SMF-28 FIBER Figure 5: Electrical Pin Assignment As shown schematically above, the stepper motor is coupled to a lead screw and lead nut assembly, which moves the filter element through the optical path. 4.1 Determining Connector Pin Assignment Figure 6 shows the filter pin numbers, as viewed from the mounting side. 1 12 Figure 6: Side Pin Location
    • VCF050/100 User’s Manual Page 14 of 20 JDS Uniphase Confidential Use Table 4 to determine which pin assignments are appropriate. The motor coils A and B are described in the next section. Table 4: Pin assignment and description Pin No. Description Comment 1 Motor Coil A − 2 Motor Coil B + 3 Motor Coil B − 4 Motor Coil A + 5 POT WIPER Moveable POT contact: voltage pick-off 6 POT + Connect to stabilised (reference) positive supply 7 POT – Connect to ground 8 Case ground 9 Not used No grounding required 10 Not used No grounding required 11 Not used No grounding required 12 Not used No grounding required 4.2 Using Pin Assignments for the Stepper Motor Control The stepper motor configuration is shown in Figure 7. The numbers are the corresponding pins on the VCF package. M 4 1 2 3 + − − + COIL A COIL B Figure 7: Stepper Motor Coil to Pin Assignment Logic “1” is +3.3 V, relative to logic “0”, and all four pins must be connected to circuitry able to source or sink a full-rated current (for example, floating or low drain TTL and CMOS zeros are not effective). 1. Determine the pin assignment using the table at the beginning of the section. Table 5 describes the motor movement logic. Executing the sequence from top to bottom increases the tuning wavelength. Executing the sequence from bottom to top decreases the tuning wavelength. User specified and designed driver circuitry is required.
    • VCF050/100 User’s Manual Page 15 of 20 JDS Uniphase Confidential Table 5: Motor Movement Logic VCF Pins 1 2 3 4 0 1 0 1 0 1 0 0 1 1 0 0 1 0 0 0 1 0 1 0 0 0 1 0 0 0 1 1 0 0 0 1 Caution Ensure that the driver circuitry utilizes feedback from the built-in potentiometer to determine the filter’s position and that the filter does not travel outside the operating range. 4.3 Mounting the VCF050/100 on a PCB The VCF050/100 package is hermetically-sealed to meet the most demanding central office and field deployments consistent with current network conditions. Care must be taken when installing the VCF050/100 unit on a PCB, as detailed here. The VCF050/100 is designed to require minimal height above a PCB. Component mounting onto a PCB must be in accordance with ANSI/IPC-A-610, Section 2. Attention must be paid to wiring and the amount of electrical isolation required for those tracks adjacent to the edges of the hole in the PCB in which the VCF is located and, in particular, near the mounting tabs. The square mounting tabs are intended to mount directly to the surface of the PCB. The unit has integral headers. It can be attached to the PCB using ordinary machine screws. With pin assignment already determined, to mount the unit on a PCB: 1. Attach the tunable filter to the PCB (using 2-56 UNC machine nuts). 2. Torque the fasteners to approximately 10 oz/in. (The value stated is a guideline; actual values are determined by user-specific installation practices.) 3. Solder the connector pins directly to the PCB (245°so ldering for <5 s).
    • VCF050/100 User’s Manual Page 16 of 20 JDS Uniphase Confidential 5. Operating and Maintenance Instructions 5.1 Determining the Position of the VCF Filter The built-in 10 KΩ potentiometer is used to determine the position of the multi-cavity filter, whether or not the potentiometer is moving, and to define the range of travel, especially the end stops. To use the potentiometer: 1. Use the potentiometer as a voltage divider by applying a regulated reference voltage (typically 5.00 or 10.00 V) across the POT+ and POT− terminals. 2. Measure the voltage difference between POT WIPER and POT−. 3. Note the minimum and maximum potentiometer voltages (VMIN and VMAX), which provide the limits of the filter’s safe operating range. Caution Operation outside this range can result in damage to the unit. See the VCF Test Report for the potentiometer readings. 4. Verify filter movement by stepping the motor and monitoring the POT WIPER voltage. A change in voltage is normally evident, except where the chosen motor movement is less than the appropriate wavelength setting accuracy.
    • VCF050/100 User’s Manual Page 17 of 20 JDS Uniphase Confidential 5.2 Using Stepper Motor Drivers The VCF contains a miniature two-phase stepper motor that moves the filter through a collimated light beam. This stepper motor must be driven by external, user-supplied, stepper motor driver/controller electronics. The VCF must be operated within its designed operational range, the limits (VMIN and VMAX) of which are defined by the potentiometer wiper voltage. For each VCF, values of minimum and maximum potentiometer settings, expressed as percentage of input voltage, are measured at the factory and included in the test report that accompanies each unit. Use outside the range can damage the filter. There are two types of driver chips available for the VCF, an H-switch push-pull driver and an integrated controller driver. To drive the filter stepper motor: 1. Choose an H-switch driver or integrated controller driver, as described as follows, and incorporate the driver into the design. 5.2.1 H-Switch Driver This option uses a simple “H-switch push-pull” driver chip, such as the SGS-Thomson’s (ex Unitrode) L293D. This type of driver chip does not contain any “logic”, so an external source of sequence commands is required to control the switching of power to the motor coils. 5.2.2 Controller Driver The VCF can also be controlled using a more complex stepper-motor controller/driver chip, such as the Motorola2 MC3479 or SGS-Thomson’s L297D. This type of driver contains internal logic to properly sequence the drive current switching to the motor and therefore only requires a clock, a direction, and an enable input. 2 Motorola is a registered trademark of Motorola, Inc.
    • VCF050/100 User’s Manual Page 18 of 20 JDS Uniphase Confidential 5.3 Using Hardware Protection To prevent the VCF filter from moving outside its designed operating range in the event of a software error, an analog circuit can be incorporated: 1. Set Low Adjust equal to VMIN and High Adjust equal to VMAX (VMIN and VMAX are determined by multiplying the reported values on the VCF Test Report by the user’s applied voltage). 2. Compare the measured potentiometer voltage to the Low Adjust and High Adjust values. The circuitry 3 shows two comparator layouts that compare the POT WIPER to either the Low Adjust (VMIN) or High Adjust (VMAX) value (Figure 8). If the OR Gate is triggered by a POT WIPER value that exceeds the Low or High Adjust, the circuit enables a change of direction in the driver. In the event that the POT WIPER voltage is disconnected momentarily from the circuit, a set voltage to the comparators is provided to allow continued control. VCB POT WIPER DRIVER LOGIC DIRECTION 74LS04 1 2 74LS32 8 10 74LS32 6 5 9 4 74LS08 3 1 2 +5V 1K +5V 1K L 239M 14 8 9 - + 1M 1K 13 10 11 - + L 239M 1M 10K GND HIGH ADJUST (V max) 10K LOW ADJUST (V min) +5V +5V 1MR* GND 1MR* * Only if circuit must work even if VCB pot wiper is disconnected. 1K DIRECTION HIGH = INCREASE ATTENUATION LOW = DECREASE ATTENUATION DRIVER ENABLE HIGH = ENABLE LOW = DISABLE GND +5V Figure 8: VCF potentiometer comparator circuitry. 3 The circuitry shown in Figure 11 was initially designed for the VCB Series Voltage-Controlled Optical Attenuator but it may also be used for the VCF Series.
    • VCF050/100 User’s Manual Page 19 of 20 JDS Uniphase Confidential 6 Calibration and Maintenance No calibration is required. No regular maintenance of the VCF is required, except for cleaning of the optical connectors (see the Clean Connectors section). Periodic polishing is recommended if multiple mating are made.
    • VCF050/100 User’s Manual Page 20 of 20 JDS Uniphase Confidential 7 Contact Information For more information, contact JDS Uniphase or your local sales representative. JDS Uniphase Corporation 3000 Merivale Road Nepean, Ontario, Canada K2G 6N7 Tel 613 843-3000 Fax 613 823-3333 North America toll-free: 800-871-8537 Worldwide toll-free: 800-8735-5378 E-mail jdsu.sales@jdsu.com Website www.jdsu.com
    • VCF050/100 User’s Manual Page 21 of 20 JDS Uniphase Confidential 8 Revision History Revision Date Changes 2.0 March 2002 New format