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Santec PEM-320 Operation Manual

Polarization extinction ratio meter
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Summary of Contents for Santec PEM-320

  • Page 1 (217) 352-9330 | Click HERE Find the Santec PEM-320 at our website:...
  • Page 2 Polarization Extinction Ratio Meter PEM-320 Operation Manual...
  • 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 PEM-320 About This Manual This manual explains the operation and safety features of the PEM-320 Polarization Extinction Ratio Meter. 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

    PEM-320 Operation Manual Contents About This Manual 1. Introduction 2. Specifications 3. Features 3.1. Real Time Display 3.2. Offset Cancel 3.3. Communication Interfaces 3.4. Analogue Data Output 3.5. Stopped Polarizer Function 3.6. High Speed Measurement 4. Principle of Operation 5. Panel Descriptions 5.1.
  • Page 6 POLARIZATION EXTINCTION RATIO METER PEM-320 7. Operation Procedures 7.1. Power On 7.2. Optical Fiber Connection 7.3. Offset Cancel 7.4. Changing Display Units 7.5. PER Averaging Function 7.6. Analogue Output 7.7. Changing the Optical Connector 8. Communication Interfaces 8.1. GPIB Control 8.2.
  • Page 7 PEM-320 Operation Manual...

  • Page 8: Introduction

    The PEM-320 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. We hope that you will be...
  • Page 9 PEM-320 Operation Manual...

  • Page 10: Specifications

    Wavelength Range 980nm, 1310nm, 1480nm & 1550nm bands. Connector Polish SPC or APC High Power Range -20dBm ~ 23dBm The following items should be supplied with your PEM-320 unit: 1. 2 power switch keys. 2. Power supply cable. 3. Analogue interface (AIF) connection cable.
  • Page 11 PEM-320 Operation Manual...

  • Page 12: Features

    3.3. Communication Interfaces The PEM-320 can be used as a stand alone bench-top type measurement instrument. However, it also boasts industry standard GPIB and RS-232C interfaces through which the unit can be fully controlled and through which all parameters can be monitored. The PEM-320 is thus suitable for automated measurements in production environments and for integration into fully automatic alignment systems.

  • Page 13: Stopped Polarizer Function

    3.5. Stopped Polarizer Function The PEM-320 measures PER using a rotating polarizer. In some circumstances, such as the automatic alignment of the lateral orientation of an optical fiber to a laser light source, it is useful to be able to stop the polarizer and measure the optical power with a faster response time than the 10Hz rotation will allow.

  • Page 14: Principle Of Operation

    PEM-320 Principle of Operation The above diagram shows the design of the PEM-320 unit. The optical fiber is connected through the input connector. The light from the fiber is then collimated by a lens, and after passing through a rotating polarizer is incident on the photodetector. In units with the high power option fitted, an optical attenuator is placed prior to the rotating polarizer.
  • Page 15 The PEM-320 displays a polarization angle of zero when the polarization axis is vertical and aligned with the alignment notch of the input connector.

  • Page 16: Panel Descriptions

    Displays the optical power. The measurement unit can be set to either mW or dBm and is toggled by pressing the Optical Power Unit Selector Key (5). The power is calibrated at the center wavelength of the operating range of the PEM-320 unit; i.e. at 980nm, 1310nm, 1480nm or 1550nm. (3) Optical Power Unit Indicator Indicates unit of optical output power (mW or dBm).
  • Page 17 Similarly, this can be changed using the Optical Power Unit Selector Key (5). Pressing the GPIB Local Key a third time saves the displayed values and returns control to normal operation. b. Pressing this key when the power to the PEM-320 is first switched on sets the RS-232C delimiter to CR (carriage return).

  • Page 18: Rear Panel

    POLARIZATION EXTINCTION RATIO METER PEM-320 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 19 Indicates model number, serial number and options installed on each unit. (6) GPIB Connector (7) Slit Slit for heat dissipation. It is important to leave at least 5 cm of space behind the PEM-320 unit to ensure proper ventilation and cooling.

  • Page 20: Safety Information

    POLARIZATION EXTINCTION RATIO METER PEM-320 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 10.3 for details of changing the fuse.

  • Page 21: Safe Operation

    PEM-320 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 22: Operation Procedures

    POLARIZATION EXTINCTION RATIO METER PEM-320 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 23 PEM-320 Operation Manual It is recommended to wait at least five minutes to allow the PEM-320 unit to warm up, and to compensate for the dark current in the photodetector, before measurements are taken. The procedure to compensate for the photodetector dark current is described in Section 7.3.

  • Page 24: Optical Fiber Connection

    Before connecting the input light, check that the optical power does not exceed the maximum specified level for the PEM-320. The maximum level of the standard model PEM-320 is +10dBm. If the optical input exceeds this limit, there is a risk of damage to the units's internal optical elements.

  • Page 25: Offset Cancel

    7.5. PER Averaging Function 7.8. Changing Display Units In normal operation the PEM-320 outputs a value for PER for each 360˚ rotation of the polarizer. This is the averaged value of two measurement cycles. The PER Averaging Function enables this averaging function to be turned on or off. The command is only available through the...

  • Page 26: Analogue Output

    0.9V = 90 deg RRDX * On PEM-320 units fitted with the option to enable monitoring of the signal directly from the photodetector Pin 2 of the AIF connector provides this "analogue through" output. The output ranges from 0 to 2.5 Volts, is autoranging, and supports measurement speeds up to 1kHz. The...

  • Page 27: Changing The Optical Connector

    4. Ensure the connector socket is correctly seated and flat with the face of the PEM-320 unit. Replace the two fixing screws and tighten finger tight. Do not overtighten the screws as this may cause damage to the unit.

  • Page 28: 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 PEM-320 allows addresses to be set in the range 00 to 30. The factory default setting is 01.

  • Page 29: Rs-232C Control

    The PEM-320 provides support for RS-232C communication through the SIF connector on the front panel. The RTDX (transmit) terminal of the PEM-320 should be connected to the receive terminal of the external device (e.g. computer). The RRDX (receive) terminal of the PEM-320 should be connected to the transmit terminal of the external device.

  • Page 30: Control Commands

    CR and this can be changed during the ‘Power On’ procedure; for details see Section 7.1 Power On. To read data from the PEM-320 it is first necessary to set the output parameter to the required data parameter. When subsequent read commands are issued the data corresponding to the set parameter is read.
  • Page 31 Starts polarizer rotating. Cancels averaging function for PER calculation. Turns on averaging function for PER calculation. Initiates reset of PEM-320 unit. Sets output variable to indicate status. Receive data command for RS-232C communication only. The value of the output variable that has been set is received after this command is issued.
  • Page 32 POLARIZATION EXTINCTION RATIO METER PEM-320 digit – Polarizer is rotating. – Polarizer has stopped rotating. digit – Measurement speed is set to 2.5Hz. – Measurement speed is set to 5Hz. – Measurement speed is set to 10Hz. digit – Normal operation.
  • Page 33 PEM-320 Operation Manual...

  • Page 34: Example Programs

    POLARIZATION EXTINCTION RATIO METER PEM-320 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 output function to read the Polarization Extinction Ratio and an input function to set the measurement speed to 5Hz.
  • Page 35 PEM-320 Operation Manual ‘Set Measurement Speed Routine ‘Subroutine description Private Sub MeasurementSpeed_Set() ‘Sets routine name to MeasurementSpeed_Set ‘Define Variables ‘Comment Dim pem320 As Integer ‘Dimensions pem320 as integer Dim pem320a As Integer ‘Dimensions pem320a as integer for error checking ‘Initialise Device ‘Comment...

  • Page 36: Rs-232C Program

    POLARIZATION EXTINCTION RATIO METER PEM-320 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 output function to read the polarization extinction ratio and an input function to set the measurement speed to 5Hz. The communications port in this example is Com1 and requires the ActiveX MSComm component to be included in the program.
  • Page 37 PEM-320 Operation Manual...

  • Page 38: Care And Maintenance

    Care and Maintenance 10.1. Care The PEM-320 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 39: Changing The Fuse

    PEM-320 Operation Manual 10.3. 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 40 POLARIZATION EXTINCTION RATIO METER PEM-320 〜 100V ac 100V ac 〜 〜 1 0V ac 〜 0V ac Fuse Housing Fuse Housing Cover Anti-Surge Fuse Fuse Holder CAUTION Before changing the fuse, always disconnect the power cord from the power outlet.
  • Page 41 PEM-320 Operation Manual 10-4...

  • Page 42: Troubleshooting

    Check the connection of the cable. is not possible. 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...
  • Page 43 PEM-320 Operation Manual 11-2...

  • Page 44: 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 45 PEM-320 Operation Manual 12-2...

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