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Santec OTF-930 Operation Manual

Optical tunable filter
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Optical Tunable Filter
OTF-930
Operation Manual

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  • Page 1 Optical Tunable Filter OTF-930 Operation Manual...
  • Page 2 Every effort has been made to ensure the information contained in this manual is accurate and easily understandable. Santec shall not, however, be liable for errors contained herein, or for incidental or consequential damages in connection with the use of this material.

  • Page 3: About This Manual

    OTF-930 About This Manual This manual explains the operation and safety features of the OTF-930 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 4: Table Of Contents

    OTF-930 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. Wavelength Calibration 4. Principle of Operation 5. Panel Descriptions 5.1. Front Panel 5.2. Rear Panel 5.2.
  • Page 5 Optical Tunable Filter OTF-930 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. Filter Bypass Control 7.6.
  • Page 6 OTF-930 Operation Manual 10. Care and Maintenance 10.1. Care 10.2. Maintenance 10.3. Cleaning the Optical Connectors 10.4. Changing the Fuse 10.5. Inspection/Calibration 11. Re-packing and shipping 11.1. Re-packing 11.2. Packing instruction 11.3. Shipping 12. Troubleshooting 13. Warranty...

  • Page 7: 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-930 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 8 OTF-930 Operation Manual...

  • Page 9: Specifications

    1.2nm bandwidth (12 type), single cavity, double cascade filter. Please see the serial number label on the rear panel for details of the filter type and options installed. The following items should be supplied with your OTF-930 unit: 1. 2 power switch keys 2.
  • Page 10 OTF-930 Operation Manual...

  • Page 11: Features

    Features 3.1. Wavelength Range The OTF-930 can be supplid in a variety of factory preset configrations. Internally,the instrument has two individual filter elements. These can be seleced to give an 80nm tuning range, or a 40nm tuning range with two different filter types. The most common configraion is 80nm to cover the C and L wavelength bands (1530-1570nm) as used in dense wavelength division multiplexed communication systems.

  • Page 12: Wavelength Calibration

    OTF-930 Operation Manual 3.4. Wavelength Calibration The OTF-930 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...

  • Page 13: Principle Of Operation

    Filter 2 : The figure above shows a schematic diagram of the OTF-930. Two filter elements, each with a 40nm wavelength range, are mounted on a stepper motor driven slider. Light is collimated by a lens and passes directly through the filter. The slider is automatically controlled to provide seemless wavelength tuning over the full 80nm range.
  • Page 14 OTF-930 Operation Manual...

  • Page 15: Panel Descriptions

    OPTICAL TUNABLE FILTER OTF-930 Panel Descriptions 5-1. Front Panel (1) (2) (3) (4) (5) (6) (7) (9) (10) (11) (26) (27) (28) (29) (25) (24) (23) (22) (21) (20) (19) (18) (17) (16) (15) (14) (13) (12) (1) Wavelength Display Panel...
  • Page 16 OTF-930 Operation Manual (5) Optical Power Unit Selector Key Toggles the optical power measurement unit between mW and dBm. (6)(7) Up / Down Arrow Key Increments / decrements value of selected digit by one unit. (8) Numeric Keypad Allows direct input of parameters in setting modes.
  • Page 17 (19) Store Key Stores the wavelength offset data to internal flash memory. This setting is then retained even when power to the OTF-930 is switched off. (20)(21) Shift Key with Indicator LED Enables alternative operation of other key functions. The indicator LED lights when the Shift Key is pressed and remains lit until a valid function key is pressed or until the Shift Key is pressed a second time.
  • Page 18 OTF-930 Operation Manual (28)(29) Peak Search (PS) Key with Indicator LED 1. Activates peak search function. Pressing this key during the search cancels the operation. The LED indicates when peak search mode is active. 2. Pressing the key after pressing the SHIFT key enables the wavelength range...

  • Page 19: Rear Panel

    Indicates model number, serial number and options installed on each unit. (4) GPIB Connector (5) Slit Slit for heat dissipation. It is important to leave at least 5 cm of space behind the OTF-930 unit to ensure proper ventilation and cooling.

  • Page 20: Bottom Panel

    OTF-930 Operation Manual 5.3. Bottom Panel (1) Slits Slits for ventilation and cooling. It is important that the unit is used in a location which allows cool air to flow freely into the slits. (2) Rubber Feet The rubber feet provide mechanical isolation from external shocks and vibrations.

  • Page 21: Safety Information

    Optical Tunable Filter OTF-930 Safety Information 6-1. Mains Voltage 6.1. Mains Voltage See Section 10.4 for details of changing the fuse. Ensure that the rating of the fuse corresponds to the mains voltage selected; details are given in Section 10.4.

  • Page 22: Safe Operation

    OTF-930 Operation Manual 6.3. Safe Operation Please note the following points when utilizing the instrument in order to protect and prevent instrument failure. DANGER!! As for this product, when the lase is input from OPT.IN, the laser is output from OPT.

  • Page 23: Operation Procedures

    Optical Tunable Filter OTF-930 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 24 Sets RS-232C delimiter to CR+LF (keys pressed together). The OTF-930 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...

  • Page 25: Optical Fiber Connection

    Before connecting the input light, check that the optical power does not exceed the maximum specified level for the OTF-930. The maximum level is +20dBm. If the optical input exceeds this limit, there is a risk of damage to the OTF-930’s internal optical elements.

  • Page 26: 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-930’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 27: 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-930’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 28: Wavelength Tuning / Setting

    If a wavelength outside the specified range is entered the OTF-930 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 29: Peak Search

    The default scan range is ±1.0nm. The Peak Search function has two modes. In the standard mode the OTF-930 steps in increments of 0.001nm and monitors the power at each wavelength. Rapid Mode the OTF-930 initially scans the wavelength range in 1nm steps and finds the wavelength with the maximum optical power.

  • Page 30: Setting Scan Range

    OTF-930 Operation Manual 7.6.1 Setting Scan Range 1. Press the Shift Key. The LED immediately above the Shift Key will light indicating the Shift function is active. 2. While the Shift function is active, press the Peak Search (PS) Key. The LED immediately above the PS Key will light.

  • Page 31: Performing A Scan

    Optical Tunable Filter OTF-930 7.6.2 Performing a Scan 1. The Peak Search uses the currently set wavelength as the center wavelength for its search. It is therefore necessary to first set the center wavelength for the scan as detailed in section 7.4.

  • Page 32: Wavelength Offset (Calibration)

    OTF-930 calibration to that of other instruments in the same system. A Wavelength Offset function, which provides up to 1.0nm adjustment, is provided for this purpose. The Wavelength Offset procedure is described below.

  • Page 33: Storing Wavelength Offset & Parameter Settings

    Optical Tunable Filter OTF-930 The data will be stored until the power to the OTF-930 is turned off, the unit is reset, or as noted above, the CAL button is pressed a second time on the active slider. To permanently store the offset follow the procedure given in Section 7.9 below.
  • Page 34 OTF-930 Operation Manual 7-12...

  • Page 35: Communication Interfaces

    The GPIB protocol requires each device connected to the data bus to have a unique address. The OTF-930 allows addresses to be set in the range 00 to 30. The factory default setting is 01. To enter the GPIB Address Setting Mode or to check the address that has been set press the SHIFT key followed by the Local key.

  • Page 36: Rs-232C Control

    RS-232C interface of the OTF-930. The delimiter for RS-232C communication is set in the factory as CR (carriage return). This can be changed when power to the OTF-930 is initially switched on. For an explanation of this procedure please see Section 7.1 Power On.

  • Page 37: Control Commands

    In both GPIB and RS-232C protocols when a command is issued that cannot be interpreted the OTF-930 outputs “NR” to the next data request. This output stops when a valid command is received. In RS-232C communication “echo-back” is used to verify correct communications.
  • Page 38 The 2-nd digit The 1-st digit The SU command is provided to enable the current operation status of the OTF-930 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 39: Example Programs

    Optical Tunable Filter OTF-930 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 40 OTF-930 Operation Manual ʻREAD POWER (dBm) ROUTINE ʻSubroutine description Private Sub Power_Read_dBm() ʻSets routine name to Power_Read_dBm ʻDefine Variables ʻComment Dim Status_dBm As String * 30 ʻDimensions and array as String of length 30 Dim otf930 As Integer ʻDimensions otf930 as...

  • Page 41: Rs-232C Program

    Optical Tunable Filter OTF-930 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 42 OTF-930 Operation Manual Form1.MSComm1.Output = “DI” + Chr$(&HD) ʻSend receive data command for RS-232 (echo back) For I = 1 To 1000000 ʻDelay to wait for echo back Next I ans = Form1.MSComm1.Input ʻRead data from MSComm1 port MsgBox (“Power = “ & ans) ʻOutput read data to screen...

  • Page 43: Care And Maintenance

    Care and Maintenance 10.1. Care The OTF-930 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 44: Cleaning The Optical Connectors

    OTF-930 Operation Manual 10.3. Cleaning the Optical Connectors Connection of the optical fiber with dust and dirt on the end of the optical connector of OTF-930 cause loss of optical output, therefore, clean the connector periodically. The optical adapter arranged at the optical connector may be pulled out by removing fixation screws, therefore, remove it and clean the end of the optical connector.

  • Page 45: Changing The Fuse

    Before changing the fuse, always disconnect the power cord from the power outlet. 10.5. Inspection/Calibration OTF-930 is warranted for a period of one year. Inspection and calibration on a regular basis (once every 12 months) is recommended.Please contact our Sales Department concerning requests for instrument inspection/calibration or consultation on other matters.
  • Page 46 OTF-930 Operation Manual 10-4...

  • Page 47: Re-Packing And Shipping

    Optical Tunable Filter OTF-930 Re-packing and shipping Special attention for re-packing and shipping is required when you ship the instrument for repair or to a remote location. 11.1. Re-packing Please make sure that the original shipping box is used during the shipment, according to the following instructions.

  • Page 48: Packing Instruction

    OTF-930 Operation Manual 11.2. Packing instruction 1. Please pack the instrument as shown below. < Side Angle > Absorb the shock during the shipment by holding the instrument with fi lms that works as a cushion from the top and the bottom 2.

  • Page 49: Troubleshooting

    Cable is not connected properly.C heck the connection of the cable. 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. 12-1...
  • Page 50 OTF-930 Operation Manual 12-2...

  • Page 51: Warranty

    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 52 SANTEC EUROPE LIMITED Tel: +44-20-3176-1550 11F Room E, Hua Du Bldg., No.838 Zhangyang Road, Pudong, Shanghai 200122 China SANTEC (SHANGHAI) Co., Ltd Tel: +86-21-58361261, +86-21-58361262 Fax: +86-21-58361263 www.santec.com E-Mail: info@santec.com OTF-930-M-E / Ver.1.9 CODE-201811-RO-KW-CPY / Santec corporation / AD&Design sec. 13-2...

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