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Santec OTF-920 Operation Manual

Optical tunable filter
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  • Page 1 (217) 352-9330 | Click HERE Find the Santec OTF-920 at our website:...
  • Page 2 Optical Tunable Filter OTF-920 Operation Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 Copyright 2000, Santec Corporation, Japan. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the prior written permission of Santec Corporation, Japan.
  • Page 4 OTF-920 About This Manual This manual explains the operation and safety features of the OTF-920 Optical Tunable Filter. To ensure the safe operation of the instrument, and to prevent the risk of personal injury and/or damage to the equipment we recommend that you read the manual fully before commencing installation and operation.

  • Page 5: Table Of Contents

    OTF-920 Operation Manual Contents About This Manual 1. Introduction 2. Specifications 3. Features 3.1. Wavelength Range 3.2. Peak Search Function 3.3. Optical Power Monitor 3.4. Optical Power Control 3.5. Wavelength Calibration 4. Principle of Operation 4.1. Wavelength Tuning / Setting 4.2.
  • Page 6 OPTICAL TUNABLE FILTER OTF-920 7. Operation Procedures 7.1. Power On / Off 7.2. Optical Fiber Connection 7.3. Setting Parameters 7.3.1. Setting using the Numeric Keypad. 7.3.2. Setting using the Up / Down Arrow Keys 7.4. Wavelength Tuning / Setting 7.5. Independent Slider Control (Option) 7.6.
  • Page 7 OTF-920 Operation Manual 10. Care and Maintenance 10.1. Care 10.2. Maintenance 10.3. Cleaning the Optical Connectors 10.4. Changing the Fuse 11. Troubleshooting 12. Warranty Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 8: Introduction

    This feature, combined with the GPIB and RS-232C interfaces, enable the filter to be used in a wide range of applications. The OTF-920 is easy to use, but to obtain the most from your unit we recommend that you read this manual fully and become familiar with its contents prior to operation.
  • Page 9 OTF-920 Operation Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 10: Specifications

    Please see the serial number label on the rear panel for details of the filter type and options installed on each unit. The following items should be supplied with your OTF-920 unit: 1. 2 power switch keys 2.
  • Page 11 OTF-920 Operation Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 12: Features

    The OTF-920 contains two sliders in which the optical filter elements, or variable attenuator elements, are mounted. The OTF-920 can thus be supplied in a variety of configurations. Please note that it is not usually possible to change the configuration after manufacture. Each slider has a tuning range of 40nm for a tunable filter and 20dB for the variable attenuator.

  • Page 13: Optical Power Control

    3.5. Wavelength Offset The OTF-920 is calibrated in the factory and should not usually require adjustment. The wavelength calibration feature enables a user to recalibrate the unit should this become necessary. An adjustment of up to ±1.0nm is possible. If the device requires an adjustment greater than this there may be a more serious problem and we recommend that you contact Santec’s technical support division.

  • Page 14: Principle Of Operation

    Lens Display The OTF-920 uses Santec’s unique linear sliding tuning technology. This ensures that the optical properties of the filter, including bandwidth, insertion loss and polarization dependent loss (PDL) are all wavelength independent. The filter element is fabricated with a wavelength gradient along its length.
  • Page 15 OTF-920 Operation Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 16: Panel Descriptions

    OPTICAL TUNABLE FILTER OTF-920 Panel Descriptions 5-1. Front Panel (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (25) (26) (27) (28) (30) (29) (24) (23) (22) (21) (20) (19) (18) (17) (16) (15) (1) Wavelength Display Panel...
  • Page 17 OTF-920 Operation Manual (5)(6) Attenuation / Wavelength Selector Key and Indicator LED (Option) Toggles the Wavelength Display (1) between display of attenuation and wavelength. This is used only when the attenuator option is fitted. The indicator LED shows which parameter has been selected.
  • Page 18 Shift + APC: Sets optical power range for APC control (option). (23)(24) Option Key with Indicator LED Enables optional features, such as independent slider control, of the OTF-920 to be operated. The indicator LED lights when the Option Key is pressed and remains lit until a valid function key is pressed or until the Option Key is pressed a second time.
  • Page 19 OTF-920 Operation Manual (29) Serial Interface (SIF) Connector Used for RS-232C communication. (30) Power On / Off Key Switch Operated using the power switch key, this is used to switch the unit on and off. Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 20: Rear Panel

    OPTICAL TUNABLE FILTER OTF-920 5.2. Rear Panel        (1) Mains Connector Socket (2) Fuse Housing (3) Mains Voltage Indicator The supply voltage is selected by removing the fuse housing cover, and rotating the mains voltage indicator so that the correct voltage, corresponding to the mains supply voltage, is shown in the window when the fuse housing cover is replaced.
  • Page 21 230V ac remove drum before turn (5) Slit Slit for heat dissipation. It is important to leave at least 5 cm of space behind the OTF-920 unit to ensure proper ventilation and cooling. (6) GPIB Connector (7) Serial Number Label Indicates model number, serial number and options installed on each unit.

  • Page 22: Safety Information

    OPTICAL TUNABLE FILTER OTF-920 Safety Information 6.1. Mains Voltage Please ensure the voltage indicated on the rear panel of the instrument corresponds with the mains voltage supply. Applying an incorrect mains voltage will damage the equipment. See Section 5.2 for details of how to change the voltage setting and Section 10.4 for details of changing the fuse.

  • Page 23: Safe Operation

    OTF-920 Operation Manual 6.3. Safe Operation The unit should not be operated in any of the following circumstances: • If water or other liquid is spilt on the unit. • When the unit is cleaned or moved. • If damage is found to the mains cord.

  • Page 24: Operation Procedures

    OPTICAL TUNABLE FILTER OTF-920 Operation Procedures 7.1. Power On / Off The power cord socket is located on the unit’s rear panel. Check that the voltage displayed in the window of the socket corresponds to the local mains voltage and plug the power cord into the socket.
  • Page 25 CL + BS Key Sets RS-232C delimiter to CR+LF (keys pressed together). The OTF-920 unit is turned off using the main ‘Power On / Off’ switch located on the front panel. Rotate the key anti-clockwise 90 degrees to switch the unit off. The key can only be removed when the unit is switched off and in the vertical ‘Off’...

  • Page 26: Optical Fiber Connection

    Before connecting the input light, check that the optical power does not exceed the maximum specified level for the OTF-920. The maximum level is +20dBm. If the optical input exceeds this limit, there is a risk of damage to the OTF-920’s internal optical elements.

  • Page 27: Setting Parameters

    The numeric keypad provides direct numeric entry for parameters such as wavelength and attenuation. The numeric value shown on the display is only saved to the OTF-920’s memory when the enter (ENT) key is pressed. After checking the numeric value displayed is the intended value to be set, always remember to press the ENT key.

  • Page 28: Setting Using The Up / Down Arrow Keys

    / decrement the active digit as required, and the Cursor Key is used to step through individual digits. When all digits have been set the numeric value shown on the display is saved to the OTF-920’s memory by pressing the enter (ENT) key. After checking the numeric value displayed is the intended value to be set, always remember to press the ENT key.

  • Page 29: Wavelength Tuning / Setting

    If a wavelength outside the specified range is entered the OTF-920 will be set at either the minimum or maximum achievable value. To cancel the input press the Wavelength / Power Selector Key and the display will return to its currently set value.

  • Page 30: Peak Search

    ±1.0nm. The Peak Search function has two modes. In the standard mode the OTF-920 steps in increments of 0.001nm and monitors the power at each wavelength. In Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 31: Setting Scan Range

    OTF-920 Operation Manual Rapid Mode the OTF-920 initially scans the wavelength range in 1nm steps and finds the wavelength with the maximum optical power. It then scans in 0.001nm steps over a range of ±1nm about this peak. The Rapid Mode thus enables a rapid scan over a wide wavelength range, whilst maintaining high accuracy of the acutual peak position, to be achieved.

  • Page 32: Performing A Scan

    Peak Search press the PS key a second time. 7.7. Optical Power Control (Option) The Optical Power Control funtion is only available on OTF-920 units supplied with an attenuator mounted in one of the sliders. There are two methods to control the optical output power.

  • Page 33: Apc Control Range Setting

    OTF-920 Operation Manual 2. Check that the Wavelength / Power Indicator LED is indicating Power. If not, press the Wavelength Power Selector Key to toggle from the Wavelength setting. 3. Enter the required value using either the Numeric Keypad or the Up / Down Arrow keys.

  • Page 34: Attenuation Setting

    OPTICAL TUNABLE FILTER OTF-920 7.7.3 Attenuation Setting The optical output power can also be adjusted by setting the attenuation directly according to the procedure below. Note that when the APC control is switched off, to enable manual attenuation setting, the attenuator will remain at its current value to ensure the output power does not suddenly change.

  • Page 35: Wavelength Offset (Calibration)

    Wavelength / Power Selector Key to cancel the operation. The data will be stored until the power to the OTF-920 is turned off, or the unit is reset. To permanently store the offset follow the procedure given in Section 7.10 below.

  • Page 36: Storing Wavelength Offset & Parameter Settings

    Data set using the Wavelength Offset described in Section 7.10 above is only saved in RAM and is not stored when the power to the OTF-920 is turned off, or when the unit is reset. To permanently store the offset data to memory follow the procedure below. This procedure stores the following parameters: Wavelength Offset, APC target power (option) and APC Control Range (option).
  • Page 37 OTF-920 Operation Manual 7-14 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 38: Communication Interfaces

    A standard GPIB delta connector is used. Connections should be made using IEEE-488 compatible cables. The GPIB protocol requires each device connected to the data bus to have a unique address. The OTF-920 allows addresses to be set in the range 00 to 30. The factory default setting is 01.

  • Page 39: Rs-232C Control

    The OTF-920 provides support for RS-232C communication through the SIF connector on the front panel. The RTDX (transmit) terminal of the OTF-920 should be connected to the receive terminal of the external device (e.g. computer). The RRDX (receive) terminal of the OTF-920 should be connected to the transmit terminal of the external device.

  • Page 40: Control Commands

    CR and this can be changed during the ‘Power On’ procedure; for details see Section 7.1 Power On. In both GPIB and RS-232C protocols when a command is issued that cannot be interpreted the OTF-920 outputs “NR” to the next data request. This output stops when a valid command is received. In RS-232C communication “echo-back”...
  • Page 41 SO x as a suffix, 1 or 2. Sets value of offset between sliders (nm). DO xx.xxx Initiates reset of OTF-920 unit. Sets output variable to indicate status. Sets output variable to suplimentary status. Receive data command for RS-232C communication only.
  • Page 42 The 2-nd digit The 1-st digit Standard Configuration The SU command is provided to enable the current operation status of the OTF-920 to be probed. The command returns a seven digit number. The interpretation of the seven digit number is detailed below: 1-st digit 0 –...
  • Page 43 OTF-920 Operation Manual Supplimentary Status Command When the OTF-920 is configured with both sliders operating over the same wavelength range the SS (supplimentary status) command can be used to probe the current operation of each slider. The value returned by the SS command has the following meaning.

  • Page 44: Example Programs

    OPTICAL TUNABLE FILTER OTF-920 Example Programs 9.1. GPIB Program The following program provides an example of the use of the Control Commands for GPIB communication. The program is written in Visual Basic and has an input function to set the wavelength and an output function to read the Optical Power.
  • Page 45 OTF-920 Operation Manual ‘READ POWER (dBm) ROUTINE ‘Subroutine description Private Sub Power_Read_dBm() ‘Sets routine name to Power_Read_dBm ‘Define Variables ‘Comment Dim Status_dBm As String * 30 ‘Dimensions and array as String of length 30 Dim otf920 As Integer ‘Dimensions otf920 as...

  • Page 46: Rs-232C Program

    OPTICAL TUNABLE FILTER OTF-920 9.2. RS-232C Program The following program provides an example of the use of the Control Commands for RS-232C communication. The program is written in Visual Basic and has an input function to set the wavelength and an output function to read the optical power. The communications port in this example is Com1 and requires the ActiveX MSComm component to be included in the program.
  • Page 47 OTF-920 Operation Manual Form1.MSComm1.Output = “DI” + Chr$(&HD) ‘Send receive data command for RS-232 (echo back) For I = 1 To 1000000 ‘Delay to wait for echo back Next I ans = Form1.MSComm1.Input ‘Read data from MSComm1 port MsgBox (“Power = “ & ans) ‘Output read data to screen...
  • Page 48 Care and Maintenance 10.1. Care The OTF-920 is a precision optical instrument and as such requires reasonable care to be taken with its handling, operation and storage. In particular: • Do not drop or expose the unit to shock as this may cause misalignment of the optics, •...
  • Page 49 OTF-920 Operation Manual 10.3. Cleaning the Optical Connectors It is important to ensure the optical connectors of the OTF-920 remain clean. Any dirt that accumulates will cause increased loss and when high optical powers are used may lead to connector damage.
  • Page 50 OPTICAL TUNABLE FILTER OTF-920 10.4. Changing the Fuse If the fuse blows it is important to determine the cause and repair the fault before replacement. The fuse rating is determined by the supply voltage as indicated below. Failure to use a fuse of the correct rating may result in damage to the equipment.
  • Page 51 OTF-920 Operation Manual 〜 100V ac 100V ac 〜 〜 120V ac 〜 230V ac Fuse Housing remove drum before turn Fuse Housing Cover Anti-Surge Fuse Fuse Holder CAUTION Before changing the fuse, always disconnect the power cord from the power outlet.
  • Page 52 Check the pin assignment of the Cable is not wired correctly. cable. If after checking the above, the unit is still not operating correctly please contact Santec's technical support division. 11-1 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 53 OTF-920 Operation Manual 11-2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 54 In no event shall Santec Corporation of Japan nor any subsidiary of Santec nor any distributor of Santec’s products be liable to the customer for any damages, including lost profits, or other incidental or consequential damages arising out of the use or inability to use this product.
  • Page 55 OTF-920 Operation Manual 12-2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

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