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New Focus 2011 User Manual

New focus front-end optical receivers
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Models 2001 and 2011
User's Manual
Front-End Optical Receivers

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Summary of Contents for New Focus 2011

  • Page 1 Models 2001 and 2011 User’s Manual Front-End Optical Receivers...
  • Page 2 Is a registered trademark of 200110 Rev. B New Focus, Inc.

  • Page 3: Table Of Contents

    Warranty New Focus, Inc. guarantees its products to be free of defects for one year from the date of ship- ment. This is in lieu of all other guarantees, expressed or implied, and does not cover inci- dental or consequential loss.

  • Page 4: Introduction

    1 µW to 10 mW. The DC÷30 setting prevents your signal from going off-scale due to DC-amplitude fluctuations. Model 2001 has a noise equivalent power (NEP) of less than 1 pW/√Hz from 400 nm to 1060 nm on the 10 scale.
  • Page 5 Table 1 Characteristics of the Front-end Optical Receivers. Model Number 2001 2011 Wavelength Range 400–1060 nm 800–1600 nm Photodiode Material Silicon InGaAs Photodiode Size 0.81 mm 0.09 mm...

  • Page 6: Theory

    The NEP as a function of wavelength on the 10 gain setting is shown in Fig. 6 for Model 2001 and in Fig. 7 for Model 2011. The NEP increases by a factor of approximately three for each full clockwise turn of the gain knob.
  • Page 7 Fig. 1 Functional block diagram of the front-end optical receiver photoreceivers. Photodiode Adjustable gain stage 10,000 Independently adjustable 1,000 6-dB/octave high- and low-pass filters with <90° phase shift SMA output Low-noise Gain multiplier: transimpedance amplifier...
  • Page 8 Fig. 2 Responsivity of Model 2001. 1000 1200 Wavelength (nm)
  • Page 9 Fig. 3 Response factor versus wavelength for the Model 2001. 1000 1200 Wavelength (nm)
  • Page 10 Fig. 4 Responsivity of the Model 2011 1000 1200 1400 1600 1800 2000 Wavelength (nm)
  • Page 11 Fig. 5 Response factor versus wave- length for the Model 2011 1000 1200 1400 1600 1800 2000 Wavelength (nm)
  • Page 12 Fig. 6 NEP as a function of wavelength for Model 2001 (at 10 Gain Setting). 1000 1200 Wavelength (nm)
  • Page 13 Fig. 7 NEP as a function of wavelength for Model 2011 (at 10 Gain Setting). 1000 1400 1800 Wavelength (nm)

  • Page 14: Operation

    Operation To check the two batteries: 1. Turn on the photoreceiver using the power switch. 2. Set the Low Frequency Adjust knob to DC. ×3 setting. 3. Set the Gain knob to 10 4. Focus at least 100 µW of optical power on the detector (or place the detector in front of a desk lamp).
  • Page 15 Tuning the position and frequency of the optical output: 1. Use the 8-32 (M4) tapped hole located on the base of the photoreceiver to mount it on an adjustment positioning device for alignment of the optical spot on the photodetector diode locat- ed on the back side of the unit.

  • Page 16: Appendix 1

    Appendix 1: Optical Input The optical input power striking the photodetector is equal to the measured voltage divided by the product of the gain knob setting times the multi- plier [1 or 3] times the wavelength response factor. For example, with these settings: Gain knob: 10 Gain multiplier: ×3 Response factor: 0.25 Volts/mW...
  • Page 17 signals over the full bandwidth, set the low corner- frequency knob to its full counterclockwise posi- tion and set the high corner-frequency knob to its full clockwise position. The corner frequency increases by a factor of three with each full clock- wise turn.
  • Page 18 Fig. 8 Setting the frequency response of the Front-end Optical Receivers Roll-off 6 dB/octive Roll-off 6 dB/octive Log (frequency)

  • Page 19: Specifications

    Specifications Dimensional 1.78 (45.2) Photodetector 5.17 (131.2) 2.25 (57.1) 8-32 (M4) Thd 1.24 (31.5) 2.31 (58.6) Performance Model 2001 Responsivity Peak: 0.6 A/W Conversion Gain Peak: 1.1x10 NEP (on the 10 scale): 1.0 pW/√Hz Model 2011 Responsivity Peak: 0.8 A/W Conversion Gain Peak: 1.5x10...

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