Newport 1607-AC Manuel utilisateur
USER’S GUIDE
Balanced Photoreceivers
Models 1607-AC & 1617-AC
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These photoreceivers are sensitive to electrostatic
discharges and could be permanently damaged if
subjected even to small discharges. Ground your-
self adequately prior to handling these detectors
or making connections. A ground strap provides
the most effective grounding and minimizes the
likelihood of electrostatic damage
phone: (877) 835-9620
e-mail: tech@newport.com • www.newport.com
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Warranty
Newport Corporation guarantees its products to be free of defects for one
year from the date of shipment. This is in lieu of all other guarantees,
expressed or implied, and does not cover incidental or consequential loss.
Information in this document is subject to change without notice.
Copyright 2022, Newport Corporation. All rights reserved.
The New Focus logo and symbol are registered trademarks of Newport
Corporation
Document Number 90099911 Rev. A
Balanced Photoreceivers Contents • 3
Contents
Introduction 5
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Principles . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operation 11
Connecting the Power Supply . . . . . . . . . . . . . . . 11
Mounting the Photoreceiver . . . . . . . . . . . . . . . . . 12
Connecting the Optical Inputs . . . . . . . . . . . . . . . 12
Connecting the Electrical Output . . . . . . . . . . . . 13
Testing the Photoreceiver . . . . . . . . . . . . . . . . . . . 14
Customer Service 15
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Specifications 16
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4 • Contents
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Balanced Photoreceivers Introduction • 5
Introduction
Overview
The Newport Model 16X7-AC balanced
photoreceiver consists of two matched photodiodes
and an RF amplifier that generates an output voltage
proportional to I1 - I2, the difference between the
photocurrents in the two photodiodes.
The Quick Start and General Principles sections
below give an overview of setting up the
photoreceiver and understanding its principles and
design. The chapters that follow give detailed
operating instructions and specifications.
Quick Start
The following parts are supplied with the
Model 16X7-AC balanced photoreceiver:
•Model 0923 Pico (m8) double-ended, male
power cable
•Model 0924 Pico (m8) male to banana plug
power cable
•Model 0927 SMB-to-BNC cable
The steps on the following pages describe the basics of
setting up and using the photoreceiver. The Operation
chapter contains more detailed information.
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6 • Introduction
1. Use one of the supplied power cables to connect
the photoreceiver to a ±15-volt power source that
can supply 200 mA. (Page 11.)
For the Newport Model 0901 power supply, use
the 0923 power cable. For other power supplies,
use the 0924 banana plug power cable.
When using the 0924 cable, take care to hook up
the banana plugs as follows to avoid damaging the
photoreceiver: Red = +15 V, Black = -15 V, Green =
Ground.
2. Mount the photoreceiver to your optical table. A
pair of 8-32 and a pair of M4-threaded holes are
located on the bottom of the unit. (Page 12.)
3. Connect the optical source to one or both optical
inputs. (Page 12.)
For the free space model, take care not to overfill
the photodiode. The 1607-AC has a 0.4-mm
diameter photodiode; the 1617-AC has a 0.1-mm
diameter photodiode.
To prevent saturation of the RF amplifier, keep the
input power below the saturation power shown on
page 16.
The optical power must remain below the absolute
maximum power listed in the specifications on page 16.
Exceeding the maximum power can damage the
photodiode and the amplifier.
4. Use the low-frequency I1and I2outputs to check
and adjust the optical inputs so that the output
powers are in the desired 0–10 V range. (Page 13.)
You can use the I2 - I1output to fine tune the
optical power balance between the two diodes.
5. Finally, connect the RF Out SMA connector to the
desired load or instrument via a 50-Wcoaxial
cable. (Page 13.)
Note:
Note:
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Balanced Photoreceivers Introduction • 7
General Principles
The Newport Model 16X7-AC balanced photoreceiver
consists of two matched photodiodes and an RF
amplifier that generates an output voltage
proportional to I1 - I2, the difference between the
photo-currents in the two photodiodes. A functional
block diagram of the balanced photoreceiver is shown
in Figure 1, and a mechanical drawing is given in
Figure 2.
Figure 1:
Functional
block diagram
of the Model
16X7-AC
Figure 2:
Mechanical
drawing of the
balanced
photoreceiver
(fiber-coupled
version)
Transmission lines connect the photodiode to the
amplifier and the amplifier to the output. The
transmission lines help to preserve speed and reduce
parasitic inductance and capacitance that can cause
ringing. DC power is delivered to the balanced
photoreceiver through a microconnector on the side
Current
Monitor
Current
Monitor
Current
Monitor
D1
D2
+V
-V
Amp
I1
I1 - I2
I2
I2 - I1
RF Out
RF Output
Power
Connection
±15 V
Low-
Frequency
Monitor
Outputs
2x 8-32 THD
FC Connectors
for Fiber-Optic
Input
0.75"
(19.0)
2.50"
(63.5)
2.50"
(63.5) 2x M4 THD
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8 • Introduction
of the unit, and the entire package is shielded to
eliminate noise pickup.
Low-frequency Monitor Outputs
In addition to the RF output, the balanced photo-
receiver has three low-frequency monitor outputs, I1,
I2and I2 - I1. These monitor outputs can be used to help
align light onto the photodiodes and to perform low-
frequency diagnostics. The monitor outputs have SMB
connectors, and an SMB-to-BNC cable is provided
with the photoreceiver.
All three monitor outputs have a transimpedance gain
of 10 V/mA. The bandwidth of the I2 - I1output is DC
to 15 kHz, and the bandwidth of the I1and I2outputs is
DC to 100 kHz.
Responsivity and Input Power
The Model 1607-AC uses a matched pair of silicon
photodiodes, and the Model 1617-AC uses a matched
pair of InGaAs photodiodes. Figure 3 shows the
typical responsivity of the photodiodes.
Figure 3:
Typical
responsivities
of the Silicon
and InGaAs PIN
photodiodes in
the 1607-AC
and 1617-AC
The amplifier has a maximum input current of 2 mA;
to avoid damage to the amplifier, never exceed this
input current. The Model 1607-AC has a peak respon-
sivity of 0.5 A/W, which means that 2 mA of photo-
Responsivity, A/W
1000 1200 1400 1600 1800
0.0
0.2
0.4
0.6
0.8
1.0
Wavelength, nm
800
600
400
1607-AC (Silicon)
1617-AC (InGaAs)
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Balanced Photoreceivers Introduction • 9
current corresponds to a maximum input optical
power of 4 mW. The Model 1617-AC has a 1.0-A/W
peak responsivity, and so the maximum input optical
power is 2 mW. At wavelengths away from the peak
responsivity the maximum input optical power scales
inversely with the responsivity.
Gain, Bandwidth and Noise
The RF amplifier is a low-noise device with 50-Winput
and output impedances. The RF amplifier’s trans-
impedance gain is 700 V/A, and the amplifier is AC-
coupled with a 40-kHz low-frequency roll-off.
The RF output stage can drive up to +12 dBm into a
50-Wload. To avoid saturating the RF amplifier, keep
the input optical power below about 2 mW for the
1607-AC and below 1 mW for the 1617-AC.
The RF bandwidth is 650 MHz for the Model 1607-AC
and 800 MHz for the Model 1617-AC. Figures 4 and 5
show typical frequency responses for the two photo-
receivers. From the bandwidths, we estimate rise times
of 0.8 ns for the 1607-AC and 0.6 ns for the 1617-AC.
Figures 4 and 5 also show the typical noise spectrum.
Since the RF amplifier is the dominant source of noise,
the noise spectrum is the same for both the 1607-AC
and 1617-AC. The noise is frequency dependent and
has a minimum input noise current in the 40-kHz to
100-MHz range of about 20 pA/ÖHz. This corresponds
to a minimum noise-equivalent power (NEP) of
40 pW/ÖHz for the 1607-AC and 20 pW/ÖHz for the
1617-AC.
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10 • Introduction
Figure 4:
1607-AC typical
frequency
response and
noise spectrum
Figure 5:
1617-AC typical
frequency
response and
noise spectrum
From 40 kHz to 800 MHz the integrated input noise
current is approximately 1.5 µArms. Multiplying this
by the 700-V/A transimpedance gain gives an output
voltage noise of 1.1 mVrms.
The 1.5-µArms integrated input noise current corres-
ponds to an equivalent input optical noise of 3 µW for
the Model 1607-AC and 1.5 µW for the Model 1617-
AC. This input optical noise level is the approximate
minimum optical signal that can be detected with
these photoreceivers. To detect a weaker signal, you
can reduce the noise by adding an electronic bandpass
filter at the output of the photoreceiver.
0 200 400 600 800 1000
Frequency, MHz
10 dB/div
Frequency Response
Noise
0 200 400 600 800 1000
Frequency, MHz
10 dB/div
Noise
Frequency Response
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