10 • General Features & Principles
NEW FOCUS, Inc.
The following table summarizes the bandwidth at each
gain setting. The bandwidth on the 3x settings is
somewhat lower than the 1x settings, and significantly
decreases at the highest gain settings. There is little
difference in frequency response between the visible
(Model 2051) and IR (Model 2053) models. The plots of
Figure 3 show the frequency-response details for each
gain setting.
Optical Power and Output Voltage
The typical operating range for these receivers is from
a few nanowatts up to 2 to 5 mW (depending on the
model and gain setting). Be careful to keep the optical
power below the maximum optical power of 10 mW
to avoid damaging the photoreceiver.
To compute the approximate output voltage for a given
input optical power use the relationship
V
out
=
P
·
R
·
G
,
Gain
Setting
Specification
Typical Performance
1x1
10 MHz
12 MHz
3x1
NA
6 MHz
1x10
NA
12 MHz
3x10
NA
6 MHz
1x10
2
NA
8 MHz
3x10
2
NA
6 MHz
1x10
3
NA
700 kHz
3x10
3
NA
700 kHz
1x10
4
NA
250 kHz
3x10
4
150 kHz
250 kHz
205x 10MHz Adj Rcvr revA.fm Page 10 Monday, January 10, 2005 9:29 AM
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