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Fig. 1

Functional block diagram of the
front-end optical receiver photoreceivers.

Photodiode

Adjustable
gain stage
10,000
1,000
100
10
1

Independently adjustable
6-dB/octave high- and
low-pass filters
with <90

°

phase shift

f

L

f

H

Low-noise
transimpedance
amplifier

Gain multiplier:
3
1

SMA output

7

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...
5
6
7
8
9
...
»

Summary of Contents for 2001

Page 1: ...Models 2001 and 2011 User s Manual Front End Optical Receivers ...

Page 2: ...2 200110 Rev B Is a registered trademark of New Focus Inc ...

Page 3: ...ix 2 Electrical Output Specifications 3 4 6 14 16 16 19 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 3 ...

Page 4: ...low pass filters as well as a 90 dB adjustable electronic gain range to allow shot noise limited detection at almost any optical power level from 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 104 scale Model 2011 has an NEP of less than 0 5 pW ...

Page 5: ...Model Number 2001 2011 Wavelength Range 400 1060 nm 800 1600 nm Photodiode Material Silicon InGaAs Photodiode Size 0 81 mm2 0 09 mm2 5 Table 1 Characteristics of the Front end Optical Receivers ...

Page 6: ...ee Appendix 1 Optical Input for a specific example Figs 4 and 5 show the responsivity and response factor for the InGaAs photodetector in the Model 2011 The noise performance of the Models 2001 and 2011 is determined by the setting of the first stage while the final gain stage simply scales the signal for ease of viewing The NEP is the amount of optical input power required for the output signal t...

Page 7: ...nd optical receiver photoreceivers Photodiode Adjustable gain stage 10 000 1 000 100 10 1 Independently adjustable 6 dB octave high and low pass filters with 90 phase shift fL fH Low noise transimpedance amplifier Gain multiplier 3 1 SMA output 7 ...

Page 8: ...8 Fig 2 Responsivity of Model 2001 200 400 600 800 1000 1200 0 0 0 2 0 4 0 6 0 8 Wavelength nm Responsivity A W ...

Page 9: ...Fig 3 Response factor versus wavelength for the Model 2001 200 400 600 800 1000 1200 0 0 0 1 0 2 0 3 0 4 Wavelength nm Response Factor 9 ...

Page 10: ...10 Fig 4 Responsivity of the Model 2011 600 800 1000 1200 1400 1600 1800 2000 0 0 0 2 0 4 0 6 0 8 1 0 Wavelength nm Responsivity A W ...

Page 11: ...11 Fig 5 Response factor versus wave length for the Model 2011 Wavelength nm Response Factor 600 800 1000 1200 1400 1600 1800 2000 0 0 0 1 0 2 0 3 0 4 0 5 0 6 ...

Page 12: ...12 Fig 6 NEP as a function of wavelength for Model 2001 at 104 Gain Setting 200 400 600 800 1000 1200 0 0 0 5 1 0 1 5 2 0 Wavelength nm NEP pW Hz ...

Page 13: ...13 Fig 7 NEP as a function of wavelength for Model 2011 at 104 Gain Setting Wavelength nm NEP pW Hz 600 1000 1400 1800 0 0 0 5 1 0 1 5 ...

Page 14: ...the batteries The photoreceivers are shipped with two fresh 9 V batteries installed To avoid confusion about how much life is left in the batteries replace the batter ies on a monthly basis when the unit is in frequent use 1 Turn off the photoreceiver using the power switch 2 Use a Phillips head screw driver to remove the two screws on the back panel of the photoreceiv er see the figure in the Spe...

Page 15: ...mm focal length biconvex singlet should be adequate for most applications 3 Turn on the optical beam 4 Connect the SMA port on the front of the pho toreceiver to a voltmeter 5 Align the detector to the beam until the output peaks on the voltmeter 6 Adjust the gain for optimal performance Refer to the discussion in Appendix 2 Electrical Output Set the Low Frequency Adjustment knob to DC Set the Gai...

Page 16: ...wer therefore is equal to 2 V 104 3 0 25 270 nW Appendix 2 Electrical Output The photoreceiver has three knobs a low frequen cy corner a high frequency corner and a gain knob as well as a gain multiplier switch Frequency Knobs The upper left knob adjusts the low frequency cor ner and the upper right knob adjusts the high fre quency corner The corner frequency is the fre quency where the response i...

Page 17: ...gh frequency cor ner there will be significant attenuation at all fre quencies In addition the low frequency knob has a DC 30 setting This is a convenient setting for observing a small AC signal on a widely varying DC compo nent It will prevent your signal from going off scale due to DC amplitude fluctuations Note With the most sensitive gain setting 104 the maximum bandwidth is reduced to 20 kHz ...

Page 18: ...Fig 8 Setting the frequency response of the Front end Optical Receivers 0 3 Response dB Roll off 6 dB octive Roll off 6 dB octive Log frequency fL fH 18 ...

Page 19: ... 1 0 pW Hz Responsivity Peak 0 8 A W Conversion Gain Peak 1 5x107 V W NEP on the 104 scale 0 5 pW Hz Accuracy Absolute 20 Range to Range Consistency 5 from 104 to 103 2 at other settings Frequency Response User definable from DC to 100 kHz on most gain settings Photodetector 2 25 57 1 5 17 131 2 1 24 31 5 2 31 58 6 8 32 M4 Thd 1 78 45 2 19 ...

Page 20: ...20 ...

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