4
Introduction
With the New Focus front-end optical receivers you
can measure optical signals conveniently and
accurately. These photoreceivers are optimized for
versatility and efficient operation. New Focus offers
two different models to match your wavelength
requirements; Table 1 lists each model’s character-
istics and specifications. Both models have
adjustable high- and 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 10
4
scale. Model 2011 has an NEP of less
than 0.5 pW/
√
Hz from 800 nm to 1600 nm on the
10
4
scale. Both models maintain a static current
drain of less than 1 mA which allows a pair of 9-V
batteries to operate for at least 500 hours.
