THORLABS PDB450 Operation Manual
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THORLABS PDB450 Operation Manual

Balance amplified photodetectors
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Balance Amplified Photodetectors
PDB4xx Series
Operation Manual
2014

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Summary of Contents for THORLABS PDB450

  • Page 1 Balance Amplified Photodetectors PDB4xx Series Operation Manual 2014...
  • Page 2 Version: Date: 20-Nov-2014 Copyright © 2014 Thorlabs...

  • Page 3: Table Of Contents

    5.1.4 PDB440x Individual Technical Data 5.1.5 PDB450x Individual Technical Data 5.1.6 PDB460x Individual Technical Data 5.2 Dimensions 5.3 Certifications and Compliances 5.4 Warranty 5.5 Copyright and Exclusion of Reliability 5.6 Thorlabs 'End of Life' Policy (WEEE) 5.7 Thorlabs Worldwide Contacts...

  • Page 4: Foreword

    Paragraphs preceeded by this symbol explain hazards that could damage the instrument and the connected equipment or may cause loss of data. Note This manual also contains "NOTES" and "HINTS" written in this form. Please read these advices carefully! © 2014 Thorlabs...

  • Page 5: General Information

    All modules must only be operated with proper shielded connection cables. Only with written consent from Thorlabs may changes to single components be carried out or components not supplied by Thorlabs be used.

  • Page 6: Installation

    Note Prior to operation, please check, if the indicated line voltage range on the power supply matches with your local mains voltage! If you want use your own power supply, Thorlabs offers an appropriate power connector cable. Carefully unpack the unit and accessories. If any damage is noticed, do not use the unit.

  • Page 7: Operating Instruction

    The damage threshold of the photo diodes is 20 mW! Exceeding this value will permanently destroy the detector! 3.1 Operating Principle Thorlabs PDB4xx Series Balanced Amplified Photodetectors consist of two well- matchedphotodiodes and an ultra-low noise, high-speed transimpedance amplifier that generates an output voltage (RF OUTPUT) proportional to the difference between the photo currents of the two photodiodes, i.e.

  • Page 8: Optical Inputs

    OUTPUT (modulated optical signal) with connected oscilloscope for measurement. In general, multi-mode fiber at the input can be used, but in this case the light beam spot diameter exceeds detector’s active area, which results in a reduced output signal as well. © 2014 Thorlabs...
  • Page 9 In balanced mode the power difference between the optical inputs should be less than the CW Saturation Power. If necessary, use external neutral density filters or attenuators to reduce the input light level. Attention The optical damage threshold is 20 mW. Exceeding this value will permanently damage the photodiodes! © 2014 Thorlabs...

  • Page 10: Electrical Outputs

    PDB4xx Series 3.3 Electrical Outputs The Thorlabs PDB4xx Series has three SMA output connectors: MONITOR + MONITOR - RF OUTPUT RF OUTPUT delivers an output voltage proportional to the difference between the photo currents of the two photodiodes This voltage can by calculated to:...

  • Page 11: Mounting

    The PDB4xx Series is housed in a rugged shielded aluminum enclosure. For post mounting an adapter can be attached to the bottom or side surface using four M2x8 screws (see below). This adapter supports #8-32 as well as M4 post mounts. The M4 tread is marked. © 2014 Thorlabs...

  • Page 12: Ac Coupling Of The Outputs

    The figure below shows the comparison of AC and DC coupled RF Output signals when modulating the input signal with a mechanical chopper at a frequency of 500 Hz. Note: Input signal for AC coupling was increased by factor 2 to allow direct waveform comparison © 2014 Thorlabs...

  • Page 13: Cmrr And Frequency Response

    OUTPUT must be considered when calculating the CMRR - it is the difference between the RF OUTPUT signal at a given frequency and the measured common mode or balanced output signal - at the same frequency. Typical measurement curves can be found in the individual technical data. © 2014 Thorlabs...

  • Page 14: Recommendations

    Another critical point can be electrostatic coupling of electrical noise associated with ground loops. In most cases an electrically isolated post (see Thorlabs parts TRE or TRE/M) will suppress electrical noise coupling. Always try to identify the electrical noise sources and increase the distance to the PDB4xx Series Balanced Detector.

  • Page 15: Maintenance And Service

    When cleaning the windows of the photodetectors, please remember that is a sensitive optical device. Gently blow off any debris using compressed air and wipe gently with an optic tissue wetted with isopropanol or alcohol. © 2014 Thorlabs...

  • Page 16: Appendix

    50  loads. Monitor outputs conversion gain is 10 V/mW, given at the detectors peak responsivity and high impedance load. Typical frequency response curves are measured using the setup described in section "CMRR and Frequency Response" © 2014 Thorlabs...

  • Page 17: Technical Data

    0 - 40 °C Operating Temperature Range Storage Temperature Range -40 to 70 °C Weight 0.35 kg (w/o power supply) ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) non-condensing © 2014 Thorlabs...
  • Page 18 PDB4xx Series Typical Detector responsivity curves Typical InGaAs Detector responsivity (PDA4xxA) Typical Si Detector responsivity (PDA4xxC) © 2014 Thorlabs...
  • Page 19 5 Appendix Typical Monitor Output Frequency Response PDB4xx Series Monitor Output Frequency Response © 2014 Thorlabs...

  • Page 20: Pdb410X Individual Technical Data

    ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) Values are given at peak responsivity of the detector, for high impedance load. For a 50 load, values to be divided by 2. © 2014 Thorlabs...
  • Page 21 5 Appendix PDB410A PDB410A: Typical RF OUTPUT Frequency Response PDB410A: RF OUTPUT Spectral Noise © 2014 Thorlabs...
  • Page 22 PDB4xx Series PDB410C PDB410C: Typical RF OUTPUT Frequency Response PDB410C: RF OUTPUT Spectral Noise © 2014 Thorlabs...

  • Page 23: Pdb420X Individual Technical Data

    ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) Values are given at peak responsivity of the detector, for high impedance load. For a 50 load, values to be divided by 2. © 2014 Thorlabs...
  • Page 24 PDB4xx Series PDB420A PDB420A: Typical RF OUTPUT Frequency Response PDB420A: RF OUTPUT Spectral Noise © 2014 Thorlabs...
  • Page 25 5 Appendix PDB420C PDB420C: Typical RF OUTPUT Frequency Response PDB420C: RF OUTPUT Spectral Noise © 2014 Thorlabs...

  • Page 26: Pdb430X Individual Technical Data

    ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) Values are given at peak responsivity of the detector, for high impedance load. For a 50 load, values to be divided by 2. © 2014 Thorlabs...
  • Page 27 5 Appendix PDB430A PDB430A: Typical RF OUTPUT Frequency Response PDB430A: RF OUTPUT Spectral Noise © 2014 Thorlabs...
  • Page 28 PDB4xx Series PDB430C PDB430C: Typical RF OUTPUT Frequency Response PDB430C: RF OUTPUT Spectral Noise © 2014 Thorlabs...

  • Page 29: Pdb440X Individual Technical Data

    ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) Values are given at peak responsivity of the detector, for high impedance load. For a 50 load, values to be divided by 2. © 2014 Thorlabs...
  • Page 30 PDB4xx Series PDB440A PDB440A: Typical RF OUTPUT Frequency Response PDB440A: RF OUTPUT Spectral Noise © 2014 Thorlabs...
  • Page 31 5 Appendix PDB440C PDB440C: Typical RF OUTPUT Frequency Response PDB440C: RF OUTPUT Spectral Noise © 2014 Thorlabs...

  • Page 32: Pdb450X Individual Technical Data

    ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) Values are given at peak responsivity of the detector, for high impedance load. For a 50 load, values to be divided by 2. © 2014 Thorlabs...
  • Page 33 5 Appendix PDB450A PDB450A: Typical RF OUTPUT Frequency Response at different gain settings PDB450A: RF OUTPUT Spectral Noise at different gain settings © 2014 Thorlabs...
  • Page 34 PDB4xx Series PDB450C PDB450C: Typical RF OUTPUT Frequency Response at different gain settings PDB450C: RF OUTPUT Spectral Noise at different gain settings © 2014 Thorlabs...

  • Page 35: Pdb460X Individual Technical Data

    ) Values are given for high impedance load. For a 50 load, values to be divided by 2. ) Values are given at peak responsivity of the detector, for high impedance load. For a 50 load, values to be divided by 2. © 2014 Thorlabs...
  • Page 36 PDB4xx Series PDB460A PDB460A: Typical RF OUTPUT Frequency Response PDB460A: RF OUTPUT Spectral Noise © 2014 Thorlabs...
  • Page 37 5 Appendix PDB460C PDB460C: Typical RF OUTPUT Frequency Response PDB460C: RF OUTPUT Spectral Noise © 2014 Thorlabs...

  • Page 38: Dimensions

    PDB4xx Series 5.2 Dimensions Mechanical Drawing PDB410, PDB420, PDB430, PDB440, PDB460, PDB480C © 2014 Thorlabs...
  • Page 39 5 Appendix Mechanical Drawing PDB450 © 2014 Thorlabs...

  • Page 40: Certifications And Compliances

    PDB4xx Series 5.3 Certifications and Compliances © 2014 Thorlabs...

  • Page 41: Warranty

    For warranty repairs or service the unit must be sent back to Thorlabs. The customer will carry the shipping costs to Thorlabs, in case of warranty repairs Thorlabs will carry the shipping costs back to the customer.

  • Page 42: Copyright And Exclusion Of Reliability

    User Manual. Should you require further information on this product, or encounter specific problems that are not discussed in sufficient detail in the User Manual, please contact your local Thorlabs dealer or system installer.

  • Page 43: Thorlabs 'End Of Life' Policy (Weee)

    Waste treatment on your own responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.

  • Page 44: Thorlabs Worldwide Contacts

    Email: europe@thorlabs.com Email: scandinavia@thorlabs.com France Brazil Thorlabs SAS Thorlabs Vendas de Fotônicos Ltda. 109, rue des Côtes Rua Riachuelo, 171 78600 Maisons-Laffitte São Carlos, SP 13560-110 France Brazil Tel: +33-970 444 844 Tel: +55-16-3413 7062 Fax: +33-811 38 17 48 Fax: +55-16-3413 7064 www.thorlabs.com...

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