Your SlideShare is downloading. ×
QUAD-VCF User Manual
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

QUAD-VCF User Manual

119

Published on

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
119
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Quad-VCF Tunable Filter Evaluation Board Controller User’s Manual Draft Revision 1.6 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.
  • 2. Table of Contents 1 General Information ..................................................................................................... 1 2 Specifications............................................................................................................... 1 2.1 OPTICAL ........................................................................................................................................ 1 2.2 ENVIRONMENTAL ............................................................................................................................ 1 2.3 ABSOLUTE POWER RATINGS ............................................................................................................ 1 2.4 MECHANICAL AND PACKAGING.......................................................................................................... 1 2.5 TEMPERATURE SENSOR................................................................................................................... 1 2.6 VCF MECHANICAL DRAWING............................................................................................................ 1 2.7 QUAD-VCF MECHANICAL DRAWING.................................................................................................. 1 3 Communication and Control......................................................................................... 1 3.1 SERIAL INTERFACE.......................................................................................................................... 1 3.2 ALARMS AND RESETS ...................................................................................................................... 1 3.3 COMMAND SET ............................................................................................................................... 1 3.4 ELECTRICAL – CONTROL INTERFACE AND PIN ASSIGNMENT ................................................................ 1 3.5 LED DESCRIPTIONS ........................................................................................................................ 1 4 Getting Started............................................................................................................. 1 4.1 BEFORE INITIALIZING AND OPERATING THE UNIT................................................................................. 1 4.2 INITIAL INSPECTION ......................................................................................................................... 1 4.3 OPERATING ENVIRONMENT .............................................................................................................. 1 4.4 POWER SUPPLY.............................................................................................................................. 1 4.5 CLEANING CONNECTORS ................................................................................................................. 1 4.6 PACKAGE CONTENTS ...................................................................................................................... 1 5 System Requirements.................................................................................................. 1 6 Software Installation..................................................................................................... 1 7 Evaluation Software ..................................................................................................... 1 7.1 DESCRIPTION OF FIELDS AND COMMANDS ......................................................................................... 1 8 Command Set .............................................................................................................. 1 9 Calibration and Maintenance........................................................................................ 1 10 Contact Information...................................................................................................... 1
  • 3. Quad-VCF User Manual Page 2 of 25 1 General Information The JDS Uniphase Quad-VCF tunable filter evaluation board is meant to drive 1-4 VCF050 or 1-4 VCF100 tunable filters. Since a controller board requires significant development effort and often, time consuming troubleshooting, JDS Uniphase offers the Quad-VCF evaluation board which allows the user to evaluate the VCF(s). The board allows total independent control of the VCF tunable filter(s) – no calibration or stepper motor driver circuitry is required to be designed by the user. By applying voltage to the board and either using a pre-determined command set or by using a supplied graphic user interface (GUI) WindowsTM based .exe, the user can task the tunable filter(s) to move to a given wavelength (frequency), read the current wavelength (frequency) setting, read current potentiometer voltages, coarsely move the tunable filter(s), and finally peak for optimum power. Figure 1: Quad-VCF with 1 VCF mounted.
  • 4. Quad-VCF User Manual Page 3 of 25 The board functional drawing (for control of 1 VCF or 4 VCFs) is shown in Figure 2. Figure 2: Functional elements of the Quad-VCF. 3 dB coupler 3 dB couplers VCFs 2% tap couplers PINs 1 2 3 4 LC/PC connector fusion splice IN OUT VCF 2% tap coupler PIN LC/PC connector fusion splice IN OUT
  • 5. Quad-VCF User Manual Page 4 of 25 Figure 3 shows the interdependencies of the Quad-VCF board. Figure 3: Functional elements of the Quad-VCF. Essentially, each VCF has its own driver and associated calibration. Each separate driver is tied-in with the board controller. The board controller in turn receives and transmits data through a serial communication port. The board also incorporates a temperature sensor to monitor the local (ambient) temperature. This gives the user the ability to manage temperature related alarms – if required. The temperature sensor is in no way tied into frequency offset firmware or VCF device dependent calibration data. The user should consider such temperature compensation when designing his board. A/D Diagnostic LEDs POT Motor VCF 1 3 dB Optical IN 3 dB VCF 2 3 dB VCF 3 VCF 4 Optical OUT 1 Optical OUT 2 Optical OUT 3 Optical OUT 4 2 % PIN 2 % PIN 2 % PIN 2 % PIN TIA TIA TIA TIA A/D SPI Power UpHost Connector RSTResetAlarm MCU RS-232 SIO CLKDIREnable SPI Temp. Sensor Stepper Motor Drivers (1 per) POT Motor POT Motor POT Motor
  • 6. Quad-VCF User Manual Page 5 of 25 The JDS Uniphase VCF050/100 Series are voltage-controlled tunable bandpass filters (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 transmission spectrum of the VCF is optimized for low insertion loss, high rejection, and low chromatic dispersion. Motor A - Motor B+ Motor B - Motor A+ Stepper Motor Optics Potentiometer Case Pot + Pot Wiper Pot - Ground OUT IN Figure 4: VCF Series block diagram. Disclaimer The Quad-VCF Evaluation Board is intended for use at temperature range of 20°C to 50°C. The user will see temperature dependent VCF frequency drift of 5 GHz (typical) during operation within temperature range. No software compensation for temperature dependent frequency drift is currently implemented on the Evaluation Board. Warning The Quad-VCF Evaluation Board was not design to support temperature cycling nor extended operating outside its operating temperature of 20 to 50°C.
  • 7. Quad-VCF User Manual Page 6 of 25 2 Specifications The following optical specifications describe the warranted characteristics of the Quad-VCF Tunable Filter Evaluation Board. Some product variants and/or customizations might not reflect the performance listed below. All specifications are excluding connectors, over operating temperature range of 20°C to 50°C, over operating wavelength tuning range, and all polarization states. All specifications apply from: IN Port to Port 1 (-4, if used). 2.1 Optical Parameters Conditions Specifications Units VCF Variant VCF050 VCF100 Min Max Min Max Wavelength tuning ranges C-band (optimized) L-band (optimized) 1525 1570 1565 1610 1525 1570 1565 1610 nm nm Channel spacing (ITU) 100 GHz 50 100 GHz At –1 dB 20 30 GHz At –3 dB 35 typical 70 typical GHz Bandwidth (BW) At –20 dB 84 160 GHz Out of band rejection −40 −40 dB With 1 VCF mounted and at filter peak 3.4 3.4 dBInsertion loss With 4 VCFs mounted and at filter peak (including two 3 dB couplers) 10.8 10.8 dB Insertion loss variation Over optimized tuning range 0.5 typical 0.5 typical dB Wavelength setting accuracy Using ‘Fine Tune’ command ±4 typical ±5 typical GHz Repeatability As measured using the potentiometer 4 4 GHz With 1 VCF mounted and ±12 GHz from filter center 0.30 0.25 dBPolarization dependent loss With 4 VCF mounted and ±12 GHz from filter center 0.40 0.40 dB With 1 VCF mounted and ±12 GHz from filter center 0.25 0.25 psPolarization mode dispersion With 4 VCF mounted and ±12 GHz from filter center 0.30 0.30 ps Group delay dispersion ±12 GHz from filter center −50 +50 −20 +20 ps/nm Return loss Measured from IN port only 40 40 dB Settling time 100 100 ms Tuning speed Considering full travel over optimized tuning range 8000 8000 ms
  • 8. Quad-VCF User Manual Page 7 of 25 2.2 Environmental Parameters Conditions Specifications Units VCF Variant VCF050 VCF100 Min Max Min Max Operating temperature +20 +50 +20 +50 °C Humidity Non-condensing ≤85% % Storage temperature Less than 48 consecutive hours −40 +85 −40 +85 °C 2.3 Absolute Power Ratings Parameters Conditions Specifications Units VCF Variant VCF050 VCF100 Min Max Min Max With 1 VCF mounted and at filter peak 0 0 dBmOptical input power (single-channel) With 4 VCFs mounted and at filter peak +5 +5 dBm With 1 VCF mounted and at filter peak +20 +20 dBmOptical input power (all channels) With 4 VCFs mounted and at filter peak* +26 +26 dB Supply voltage (5 V) 4.5 5.5 4.5 5.5 VDC * Total optical input power, at any port, spread over the operating band. 2.4 Mechanical and Packaging Parameters Conditions Specifications Units VCF Variant All Pigtail length 1.0 ± 0.1 m Connector type LC/PC Buffer type 900 µm Fiber type SMF-28 of equivalent Dimensions W × H × D. Height includes standoffs. 158.75 × 30.00 × 152.40 mm Weight Including 1 mounted VCF. Not including shipment package, and accessories. 500 g 2.5 Temperature Sensor Mark and model: Dallas Semiconductor’s DS1722 Digital Thermometer with SPI/3-Wire Interface. Parameters Conditions Specifications Units Operating range −55 to +120 °C Thermometer error From −40°C to +85°C ±2.0 °C
  • 9. Quad-VCF User Manual Page 8 of 25 2.6 VCF Mechanical Drawing The dimensions (in [mm]) of the VCF with side pin-out are given. Side and top views are provided in Figure 5. Figure 5: VCF050/100 Filter Schematic for side pin-out package. Note 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
  • 10. Quad-VCF User Manual Page 9 of 25 2.7 Quad-VCF Mechanical Drawing The dimensions (in [mm]) of the Quad-VCF and is provided in Figure 6. Figure 6: Quad-VCF board layout.
  • 11. Quad-VCF User Manual Page 10 of 25 3 Communication and Control 3.1 Serial Interface The serial interface will be through the DB9 (J2) connectors with standard voltage. Upon start-up or reset, the unit defaults to - 9600 baud, - 8-bit, no parity, - 1 start bit and 1 stop bit, - no handshaking. 3.2 Alarms and Resets When the Quad-VCF raises or clears an alarm (ERR), it asserts the alarm pin (active low) for a duration between 30.3 ns to 2.5 ms. When the reset pin (RST) is asserted from outside (active low), the Quad-VCF’s processor and circuitry goes into reset. The processor remains in reset as long as this signal is asserted. During reset, the VCFs maintain their positions, i.e. they latch onto the selected channel. 3.3 Command Set The following is a list of base requirements that are met by the Quad-VCF when applying the command set. • The host computer sends commands to the Quad-VCF board only via the serial interface (J2) • When the Quad-VCF board receives commands, it acknowledges (ACK) that the command is received without error • When the Quad-VCF board starts executing the command task it lends itself ready to receive a new command from the host computer • If the host computer sends another command to the Quad-VCF while the Quad-VCF is executing the task of the previous command, the Quad-VCF receives the command and acknowledges that the command is received without any error. • The Quad-VCF incorporates the new task into its processing and performs all the tasks concurrently • The Quad-VCF board can execute the tuning of up to 4 VCFs simultaneously and/or independently. • When the VCF-tuning task is completed, the status of that device is updated, and can be accessed with the GTF (Get TF Frequency) command. If the VCF is still tuning, the response to the above command will indicate that this is the case. • When the Quad-VCF encounters an error condition for a particular task, it raises an alarm, terminates the task, and continues on with the next task. The error condition is then accessed with the GMS (Get Module Status) command.
  • 12. Quad-VCF User Manual Page 11 of 25 3.4 Electrical – Control Interface and PIN Assignment Connector type Description Connection Notes J1 : 25 pins DB25 Male Parallel port of PC Use available printer port J2 : 9 pins DB9 Female Serial port of the PC Use null modem cable supplied with shipment J3 : 1-14 pin RS232 Male Parallel port of PC 2 rows, 7 pins per row, 0.1″ spacing J4 : 1-14 pin AC-DC 100- 250V ~ 5V, 5A Power supply port Use the wall adapter supplied J5 : 1-10 pin RS232 Male Factory program and firmware upload J6 Factory calibration J1 PIN number Assignment J2 PIN number Assignment J3 PIN number Assignment J1-01 No connection J2-01 No connection J3-01 RST J1-02 No connection J2-02 Rx IN J3-02 ERR J1-03 No connection J2-03 Tx OUT J3-03 Msg J1-04 No connection J2-04 No connection J3-04 Tx OUT J1-05 RST J2-05 Digital GND J3-05 Digital GND J1-06 No connection J2-06 No connection J3-06 Digital GND J1-07 No connection J2-07 No connection J3-07 Digital GND J1-08 No connection J2-08 No connection J3-08 Rx IN J1-09 No connection J2-09 No connection J3-09 Vcc J1-10 No connection J3-10 No connection J1-11 No connection J3-11 Digital GND J1-12 ERR J3-12 No connection J1-13 Msg J3-13 No connection J1-14 No connection J3-14 No connection J1-15 No connection J1-16 No connection J1-17 No connection J1-18 Digital GND J1-19 Digital GND J1-20 Digital GND J1-21 Digital GND J1-22 Digital GND J1-23 Digital GND J1-24 Digital GND J1-25 Digital GND 3.5 LED Descriptions See Figure 6 for LED emplacement on Quad-VCF board. LED number Description Notes 1 * Peak Tune Lights up when Fine Tune command is enabled 2 * Channel Tune Lights up when Set Frequency command is enabled 3 * Error 4 Power * Due to time-to-market needs, firmware to enable this LED function was not implemented in R1.1.
  • 13. Quad-VCF User Manual Page 12 of 25 4 Getting Started 4.1 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. 4.2 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. 4.3 Operating Environment This units should only operated at room temperature. 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. 4.4 Power Supply The Quad-VCF board is powered using a AC-DC 100-250V ~ 5V, 5A wall adapter (supplied). The Quad-VCF does not incorporate a fuse.
  • 14. Quad-VCF User Manual Page 13 of 25 4.5 Cleaning Connectors Optical cable ends need to be cleaned before using them with the unit. Caution • Connecting damaged or dirty fibres 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. 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° ethanol (do not use rubbing alcohol, which contains 30% water) To clean the connectors: 1. Blow the sleeve with filtered compressed air (Figure 7). Figure 7: 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 ferrule end 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.
  • 15. Quad-VCF User Manual Page 14 of 25 4.6 Package Contents The Quad-VCF tunable filter evaluation board package consists of the following components: • One board populated with 1-4 piece(s) VCF050 or 1-4 piece(s) VCF100 • One null modem cable (9 Pin), 10′ in length • One AC-DC 100-250V ~ 5V, 5A wall adapter • JDS Uniphase GUI Software (2 floppy disks or 1 CD) 5 System Requirements The system requirements are: • PC-Based Computer (Pentium 2, 300 MHz, 128M of RAM, CD-ROM) • Windows 2000/NT/Me/9x • One unused parallel port and/or one unused serial port (printer) 6 Software Installation Disk 1 includes the following files: single1.CAB, setup.LST and setup.EXE Disk 2 include 1 file: single2.CAB To install the software required for control of the Quad-VCF board, follow these steps: 1. Disk: Insert the VCFXXX-DBYZ (X=050/100, Y=1-4, Z=C/L) disk 1 into the A: floppy disk drive and download the files included into a selected directory. Enter then disk 2 and download the remaining file into that same directory. 1. CD: Insert the VCFXXX-DBYZ (X=050/100, Y=1-4, Z=C/L) CD into the CD Rom drive and download the files into a selected directory. 1. E-mail: The files were probably zipped using winwip2 . The file name is VCF Controller.zip. You can run setup.EXE directly from winzip if preferred. In this event, Windows Install will ask you to run the program from .zip to which to only need to accept by pressing <OK>. 2. Locate the directory where the files were downloaded and double click the setup.EXE. 3. Extract the setup.EXE program onto your local hard drive. 4. Locate the setup.EXE program and double click on it to begin the setup. 5. Follow the instruction given by Windows Install. Run the program when completed. 2 Users that do not have winzip can download winzip 8.1 free from: http://www.winzip.com/upgradex.htm#upgrdl.
  • 16. Quad-VCF User Manual Page 15 of 25 7 Evaluation Software NOTE: The example shown below reflects a board populated with 1 single VCF. The software interface (Control of VCF) is intended to provide a low level (basic) interface to the functions of the Quad-VCF. When the program (VCF Controller.exe) is initiated, the following screen will appear: Pressing the button terminates the program.
  • 17. Quad-VCF User Manual Page 16 of 25 7.1 Description of Fields and Commands Boxed fields highlighted in white (except for Get Version Info) represent numerical inputs. These inputs are: • Set Frequency (in THz), and • Move (in Steps), which is further characterized by Up or Down options. Boxed fields with lowlight of grey display are numerical outputs. The outputs are: • Get Pot Voltage (in Volts); • Get Frequency (in THz), and • Get Module Temperature (in °C). The Set Frequency must first be enabled by entering a desired frequency (in THz). I list of THz – nm conversions is given in the following table.
  • 18. Quad-VCF User Manual Page 17 of 25 Freq. (THz) λ (nm) Freq. (THz) λ (nm) Freq. (THz) λ (nm) Freq. (THz) λ (nm) Freq. (THz) λ (nm) 197.5 1517.937 195 1537.397 192.5 1557.363 190 1577.855 187.5 1598.893 197.45 1518.321 194.95 1537.792 192.45 1557.768 189.95 1578.270 187.45 1599.320 197.4 1518.705 194.9 1538.186 192.4 1558.173 189.9 1578.686 187.4 1599.746 197.35 1519.090 194.85 1538.581 192.35 1558.578 189.85 1579.102 187.35 1600.173 197.3 1519.475 194.8 1538.976 192.3 1558.983 189.8 1579.518 187.3 1600.600 197.25 1519.860 194.75 1539.371 192.25 1559.389 189.75 1579.934 187.25 1601.028 197.2 1520.246 194.7 1539.766 192.2 1559.794 189.7 1580.350 187.2 1601.455 197.15 1520.631 194.65 1540.162 192.15 1560.200 189.65 1580.767 187.15 1601.883 197.1 1521.017 194.6 1540.557 192.1 1560.606 189.6 1581.184 187.1 1602.311 197.05 1521.403 194.55 1540.953 192.05 1561.013 189.55 1581.601 187.05 1602.740 197 1521.789 194.5 1541.349 192 1561.419 189.5 1582.018 187 1603.168 196.95 1522.175 194.45 1541.746 191.95 1561.826 189.45 1582.436 186.95 1603.597 196.9 1522.562 194.4 1542.142 191.9 1562.233 189.4 1582.854 186.9 1604.026 196.85 1522.949 194.35 1542.539 191.85 1562.640 189.35 1583.272 186.85 1604.455 196.8 1523.336 194.3 1542.936 191.8 1563.047 189.3 1583.690 186.8 1604.885 196.75 1523.723 194.25 1543.333 191.75 1563.455 189.25 1584.108 186.75 1605.314 196.7 1524.110 194.2 1543.730 191.7 1563.863 189.2 1584.527 186.7 1605.744 196.65 1524.498 194.15 1544.128 191.65 1564.271 189.15 1584.946 186.65 1606.174 196.6 1524.885 194.1 1544.526 191.6 1564.679 189.1 1585.365 186.6 1606.605 196.55 1525.273 194.05 1544.924 191.55 1565.087 189.05 1585.784 186.55 1607.035 196.5 1525.661 194 1545.322 191.5 1565.496 189 1586.203 186.5 1607.466 196.45 1526.050 193.95 1545.720 191.45 1565.905 188.95 1586.623 186.45 1607.897 196.4 1526.438 193.9 1546.119 191.4 1566.314 188.9 1587.043 186.4 1608.329 196.35 1526.827 193.85 1546.518 191.35 1566.723 188.85 1587.463 186.35 1608.760 196.3 1527.216 193.8 1546.917 191.3 1567.133 188.8 1587.884 186.3 1609.192 196.25 1527.605 193.75 1547.316 191.25 1567.542 188.75 1588.304 186.25 1609.624 196.2 1527.994 193.7 1547.715 191.2 1567.952 188.7 1588.725 186.2 1610.056 196.15 1528.384 193.65 1548.115 191.15 1568.362 188.65 1589.146 186.15 1610.489 196.1 1528.773 193.6 1548.515 191.1 1568.773 188.6 1589.568 186.1 1610.921 196.05 1529.163 193.55 1548.915 191.05 1569.183 188.55 1589.989 186.05 1611.354 196 1529.553 193.5 1549.315 191 1569.594 188.5 1590.411 186 1611.787 195.95 1529.944 193.45 1549.715 190.95 1570.005 188.45 1590.833 185.95 1612.221 195.9 1530.334 193.4 1550.116 190.9 1570.416 188.4 1591.255 185.9 1612.654 195.85 1530.725 193.35 1550.517 190.85 1570.828 188.35 1591.678 185.85 1613.088 195.8 1531.116 193.3 1550.918 190.8 1571.239 188.3 1592.100 185.8 1613.522 195.75 1531.507 193.25 1551.319 190.75 1571.651 188.25 1592.523 185.75 1613.957 195.7 1531.898 193.2 1551.721 190.7 1572.063 188.2 1592.946 185.7 1614.391 195.65 1532.290 193.15 1552.122 190.65 1572.476 188.15 1593.369 185.65 1614.826 195.6 1532.681 193.1 1552.524 190.6 1572.888 188.1 1593.793 185.6 1615.261 195.55 1533.073 193.05 1552.926 190.55 1573.301 188.05 1594.217 185.55 1615.696 195.5 1533.465 193 1553.329 190.5 1573.714 188 1594.641 185.5 1616.132 195.45 1533.858 192.95 1553.731 190.45 1574.127 187.95 1595.065 185.45 1616.568 195.4 1534.250 192.9 1554.134 190.4 1574.540 187.9 1595.489 185.4 1617.004 195.35 1534.643 192.85 1554.537 190.35 1574.954 187.85 1595.914 185.35 1617.440 195.3 1535.036 192.8 1554.940 190.3 1575.368 187.8 1596.339 185.3 1617.876 195.25 1535.429 192.75 1555.343 190.25 1575.782 187.75 1596.764 185.25 1618.313 195.2 1535.822 192.7 1555.747 190.2 1576.196 187.7 1597.189 185.2 1618.750 195.15 1536.216 192.65 1556.151 190.15 1576.610 187.65 1597.615 185.15 1619.187 195.1 1536.609 192.6 1556.555 190.1 1577.025 187.6 1598.041 185.1 1619.624 195.05 1537.003 192.55 1556.959 190.05 1577.440 187.55 1598.467 185.05 1620.062
  • 19. Quad-VCF User Manual Page 18 of 25 The Fine Tune command to a channel is always executed after the initial Set Frequency command has been made. Subsequent fine tunings to this channel can be executed when required until full optimization is obtained NOTE: If the laser line is output from a tunable laser, it should be coupled to an external wavelength reference (e.g. wavelength meter) such as to avoid any potential discrepancy between Quad-VCF output and software output values. Each VCF has an associated PIN detector and both are setup onto the board to provide a feedback loop (closed). The Fine Tune command uses this surface mounted PIN detector and requires a laser line to pass through the VCF(s). By pressing the , the built- in peak-for-power algorithm will be activated and will seek to optimize for maximum transmission relative to the desired channel (as entered in the Set Frequency field). Factory Default moves all VCFs to the factory defined frequency (191.55 THz for L-band and 196.55 THz for C-band). Get Version Info allows the user (and factory) to identify key software, serial number and calibration records. Get Module Temperature allows real-time feedback of the PCB ambient temperature. NOTE: Get Module Temperature does not reflect the VCF or case temperature.
  • 20. Quad-VCF User Manual Page 19 of 25 Pressing the Get Version Info and Get Module Temperature buttons yields the following screen: Entering, say, a frequency of 187.0 THz (1603.168 nm) and pressing the button instructs the VCF to go to that frequency (to within its setting accuracy). The Quad-VCF board can then be tasked to move the VCF up, say, 100 Up steps by entering 100 into the field box, then making sure the Up checkmark is selected (default) and pressing the button. By pressing the and buttons, we obtain a screen that outputs the current potentiometer voltage and current frequency setting of the VCF. Now, if we enter 100 Down steps by entering 100 into the field box and selecting the Down checkmark, then pressing the , the VCF will return to its initial position (within the frequency setting accuracy of the VCF variant). This can be confirmed by pressing the button.
  • 21. Quad-VCF User Manual Page 20 of 25 Finally, by using the button, we can task the VCF to more closely fit its center frequency to the desired user-requested frequency. The fine tune (or peak-for-power) function is done using an optimization algorithm that compares power levels from the PIN diode. The first step in this algorithm is to set the VCF to the desired ITU channel (or user-requested frequency). This is often called coarse tuning. This can be done in 2 ways: • using the potentiometer as feedback. This is a slow option and requires continuously waiting for a voltage change; • counting steps (distance, in steps, between ITU channels obtained during VCF calibration) then using the potentiometer to corroborate that the correct ITU channel was obtained. Both options require a look-up calibration table that sets wavelength (or ITU channel) vs. step count vs. potentiometer wiper voltage (for that given ITU channel).3 Once the VCF has settled to within the desired ITU channel (Point 1 in figure below), the VCF is stepped up (along the same direction as it entered the channel) and power is measured from the PIN. The VCF will continue to step until power is seen to be decreasing – say after 2-3 consecutive steps (Point 2). Once this is confirmed, the logic will indicate that the VCF center frequency has passed the peak (PMAX in the figure below) and then the VCF will be asked to change directions (where it should seen increased power onto the PIN) until is again sees a power drop (Point 3) and so on until maximum power is seen on the PIN diode (Point 4). The VCF can be positioned to within 1 step (±4 GHz for VCF050 and ±5 GHz for VCF100) and a slight power relative difference (∆). 3 This is done at the factory and stored within memory. JDS Uniphase provides ITU vs. potentiometer voltage and step count in electronic format (diskette and/or electronic data transfer). Arbitrary ITU channel ITU center frequency Loss/Transmission Step size PMAX ≤1 step ∆ 1 2 3 4
  • 22. Quad-VCF User Manual Page 21 of 25 Pressing the brings the VCF back to its factory setting (191.55 THz for L-band and 196.55 THz for C-band). Pressing the button will terminate the program.
  • 23. Quad-VCF User Manual Page 22 of 25 8 Command Set To demonstrate the flexibility of the VCFs, this software package allows the user to send commands to the Quad-VCF via the serial interface. The commands to and responses from the Quad-VCF are sent in ASCII form and may be accessed via a standard terminal interface program or a dedicated software driver. All command must be terminated by a carriage return <CR>. Sentence Command Channel Argument Description Basic commands STF Set Tunable (filter) Frequency [1,2,3,4] <VALUE> Sets the specified VCF to the frequency given [in THz] GTF Get Tunable (filter) Frequency [1,2,3,4] 000000 Returns the frequency of the specified VCF [in THz] STM Set Tunable (filter) Movement [1,2,3,4] <VALUE> Moves the specified VCF up or down in frequency by specifying the number of steps STP Set Tunable (filter) (peak) Power [1,2,3,4] 000000 Re-optimizes the selected VCF to the peak power GTP Get Tunable (filter) (peak) Power [1,2,3,4] 000000 Returns the calibrated output power from the specified VCF Status and Firmware GMS Get Module Status 0 000000 Returns the status of the module GMV Get Module Version 0 000000 Returns the module serial number, hardware version and firmware version SMF Send Module Firmware 0 000000 Begins the firmware download process GMF 0 000000 Begins the firmware upload GMC Get Module Calibration (data) 0 000000 Returns calibration and deliverable data SMD Set Module (to factory) Defaults 0 000000 Returns the module to it’s factory default settings Temperature GMT Get Module Temperature 0 000000 Returns the module temperature SMA Set Module (temperature) Alarm (threshold) 0 <VALUE> Sets the temperature drift alarm threshold GMA Get Module (temperature) Alarm (threshold) 0 000000 Returns the temperature drift alarm threshold STC Set (automatic) Temperature (drift) Correction 0 00000[1|0] Turns automatic temperature drift correction ON or OFF GTC Get (automatic) Temperature (drift) Correction 0 000000 Returns the state of automatic temperature drift correction
  • 24. Quad-VCF User Manual Page 23 of 25 9 Calibration and Maintenance No calibration is required. Factory settings are maintained throughout the lifetime of the board. Care must be taken in handling the optical fibres. Avoid bending and twisting the fibre. Maintain periodic polishing of connectors if multiple matings are made. Ensure that proper ESD precautions are taken to prevent damaging the Quad-VCF board electronics. Ensure that the Quad-VCF Evaluation Board is not temperature cycled nor kept operating outside the recommended operating temperature range of +20°C to +50°C. Avoid condensation – dry off board in the event condensation occurs or is suspected by allowing 4-6 hours drying time and ½-1 full hour warm up time before using.
  • 25. Quad-VCF User Manual Page 24 of 25 10 Contact Information For more information on this or other products and their availability, please contact your local JDS Uniphase account manager or JDS Uniphase directly at 800-871-8537 in North America and 800-8735-5378 worldwide or via e-mail at jdsu.sales@jdsu.com.

×