Agilent 83440B/C/D
High-Speed
Lightwave Converters
DC-6/20/30 GHz, 1000 to 1600 nm
Technical Specifications
Fast optical detector
for characterizing
lightwave signals
• Fast 15, 22, or 73 ps full-width
half-max (FWHM) pulse response
• Broad 6, 20, or 30 GHz bandwidth
(3 dBopt)
• Small, convenient package
• Low pulse aberrations
• Integral bias regulation
• Ideal for high-speed digitizing
oscilloscopes
Make lightwave measurements with
traditional electrical instruments;
the Agilent 83440 family offers a
high-speed optical interface for
oscilloscopes, spectrum analyzers,
and network analyzers.
With as low as 15 ps FWHM pulse
response, the 83440 accurately
converts modulated optical wave-
forms to electrical signals, enabling
electrical instruments to measure
time domain pulse parameters and
frequency domain spectral content.
Characterize and optimize laser and
optical modulator output performance
for fiber optic telecommunications.
Description
The 83440 lightwave converters are
fast, accurate, DC-coupled optical-to-
electrical (O/E) converters packaged
as small optical probes. They mount
directly to electrical instrument front
panels to simplify integration and
minimize distortion and loss from
cables, connectors, and signal condi-
tioning components. A simple inter-
nal structure ensures very low signal
distortion for improved output signal
fidelity. By eliminating all unneces-
sary components along the signal
path, the 83440 family offers very
accurate electrical representations of
modulated optical waveforms. The
83440 family features hermetically
sealed, unamplified, InGaAs photodi-
odes. The input optical port features
the Agilent universal optical inter-
face, compatible with most common
optical connectors (see Connectors,
page 6), while the output electrical
port features a precision 3.5 mm
(83440B/C) or 2.4 mm (83440D)
microwave coaxial connector.
Time Domain Applications
Ideal for high-speed laser and
modulator testing, the DC-coupled
83440 family faithfully reproduces
incoming optical signals for accu-
rate pulse parameter characteriza-
tion. Broad bandwidth, nearly
Gaussian response characteristics,
and low pulse aberrations make these
optical detectors an excellent choice
for high-speed time domain mea-
surements.
Frequency Domain
Applications
The frequency domain allows users
to measure, quantify, and model
modulated characteristics such as
spectral purity, harmonic content,
and noise spectral density. The 83440
family allows electrical frequency
domain instruments like network
and spectrum analyzers to accept
optical input signals for basic
lightwave measurements.
2
Agilent 83440B
Specifications and Characteristics
Specifications
describe the instrument’s warranted performance over the temperature range
0 to 55°C (except where noted).
Supplemental Characteristics
are intended to provide information
useful in applying the instrument by giving typical but non-warranted performance parameters.
These are denoted as “typical,” “nominal,” or “approximate.”
Typical Response Curves
1
83440B Responsivity vs Wavelength
.8
.7
.6
.5
.4
.3
.2
.1
0
850
83440B Uncorrected
Pulse System Response
13
0
83440B
Frequency Response
0
–1
–3 dB
elec
Responsivity (A/W)
Relative voltage
dB
electrical
–2
–5
–3 dB
opt
–3
–4
dB
optical
.5
FWHM 50 ps
1050
1300
Wavelength (nm)
1550
0
–100
–10
0
100
Time (ps)
Response of a Agilent 83440B lightwave
detector on an Agilent 54124 oscilloscope
due to a 2 ps pulsed YAG laser.
Frequency Domain
DC Responsivity
1,4
(min)
1300 nm
1550 nm
0.70 A/W
0.65 A/W
2
–3.1 dB
–3.7 dB
2
0.33 A/W
0.30 A/W
–9.6 dB
2
–10.5 dB
2
Bandwidth
3,4
dc to >6 GHz (-3dB optical)
0
–5
3
6
9
Frequency (GHz)
Deconvolved frequency response from
2 ps pulsed YAG laser measured by
Agilent 83440B and Agilent 54124 oscilloscope.
Time Domain
Conversion Gain
1,4
(min, into 50
Ω
load)
1300 nm: 35 V/W
1550 nm: 32.5 V/W
Opt 050: 16.5 V/W
15 V/W
Typical 83440B
Saturation Characteristics
1
Relative Electrical Bandwidth
Pulse Width
3, 4,10
< 73 ps FWHM
6
(calculated:FWHM=0.44/BW
opt
≈0.312/BW
el
)
Rise/Fall Time
7,10 (10-90%)
<80ps (calculated)
System Aberrations
4,13
(response to 2 ps FWHM pulse)
10% peak-to-peak max, 5% typical
Noise
5,11
2 µW RMS max, equivalent optical noise power
Dark Current
11
50 nA max, <15 nA typical
Maximum Safe Input Optical Power
10 mW (Peak)
+10 dBm (Peak)
Maximum Operating Input Optical Power
(Compression Point)
2 mW (Peak)
+3 dBm (Peak)
See saturation chart for pulsed power characteristics
Input Optical Reflection
8
(HMS-10 optical connector)
0.05% (1250-1600 nm)
Wavelength Spectral Response
4
1000 nm - 1600 nm
0.5
Noise Equivalent Power
5,11
< 18 pW/
√
Hz typical
0
0
500
Peak Optical Power (mW)
5 ps pulse width (1060 nm)
Input Optical Return Loss
8
(HMS-10 optical connector)
>33 dB (1250-1600 nm)
See Notes, page 7
3
Agilent 83440C
Specifications and Characteristics
Specifications
describe the instrument’s warranted performance over the temperature range
0 to 55°C (except where noted).
Supplemental Characteristics
are intended to provide information
useful in applying the instrument by giving typical but non-warranted performance parameters.
These are denoted as “typical,” “nominal,” or “approximate.”
Typical Response Curves
1
83440C Responsivity vs Wavelength
.8
.7
.6
.5
.4
.3
.2
.1
0
850
83440C Uncorrected
Pulse System Response
13
0
83440C
Frequency Response
0
–1
–3 dB
elec
Responsivity (A/W)
Relative voltage
dB
electrical
–2
–5
–3 dB
opt
–3
–4
dB
optical
.5
FWHM 20.3 ps
1050
1300
Wavelength (nm)
1550
0
–100
–10
0
0
100
Time (ps)
Response of a Agilent 83440C lightwave
detector on an Agilent 54124 oscilloscope
due to a 2 ps pulsed YAG laser.
Frequency Domain
DC Responsivity
1,4
(min)
1300 nm
1550 nm
0.70 A/W
0.65 A/W
–3.1 dB
2
–3.7 dB
2
Bandwidth
3,4
dc to >20 GHz (-3dB optical)
Relative Electrical Bandwidth
–5
10
20
30
Frequency (GHz)
Deconvolved frequency response from
2 ps pulsed YAG laser measured by
Agilent 83440C and Agilent 54124 oscilloscope.
Time Domain
Conversion Gain
1,4
(min, into 50
Ω
load)
1300 nm: 35 V/W
1550 nm: 32.5 V/W
Typical 83440C
Saturation Characteristics
1
Pulse Width
3, 4,10
< 22 ps FWHM
6
(calculated:FWHM=0.44/BW
opt
≈0.312/BW
el
)
Rise/Fall Time
7,10 (10-90%)
<24ps (calculated)
System Aberrations
4,13
(response to 2 ps FWHM pulse)
10% peak-to-peak max, 5% typical
Noise
5,11
3.7 µW RMS max, equivalent optical noise power
Dark Current
11
20 nA max, 3 nA typical
Maximum Safe Input Optical Power
10 mW (Peak)
+10 dBm (Peak)
Maximum Operating Input Optical Power
(Compression Point)
2 mW (Peak)
+3 dBm (Peak)
See saturation chart for pulsed power characteristics
Input Optical Reflection
8
(HMS-10 optical connector)
0.05% (1250-1600 nm)
Wavelength Spectral Response
4
1000 nm - 1600 nm
0.5
Noise Equivalent Power
5,11
< 18 pW/
√
Hz typical
0
0
500
Peak Optical Power (mW)
5 ps pulse width (1060 nm)
Input Optical Return Loss
8
(HMS-10 optical connector)
>33 dB (1250-1600 nm)
See Notes, page 7
4
Agilent 83440D
Specifications and Characteristics
Specifications
describe the instrument’s warranted performance over the temperature range
0 to 55°C (except where noted).
Supplemental Characteristics
are intended to provide information
useful in applying the instrument by giving typical but non-warranted performance parameters.
These are denoted as “typical,” “nominal,” or “approximate.”
Typical Response Curves
1
83440D Responsivity vs Wavelength
0.5
83440D
Uncorrected System Pulse Response
13
0
83440D Frequency Response
0
–3 dB
elec
dB
electrical
–1
dB
optical
–2
–5
–3 dB
opt
–3
–4
–10
0
–5
20
30
40
Frequency (GHz)
Deconvolved frequency response from
2 ps pulsed YAG laser measured by
Agilent 83440D and Agilent 54124 oscilloscope.
10
Responsivity (A/W)
0.3
0.2
0.1
0
850
1000
1300
Wavelength (nm)
1550
Relative voltage
0.4
.5
FWHM 14.7 ps
0
–50
0
50
100
Time (ps)
Response of a Agilent 83440D lightwave
detector on an Agilent 54124 oscilloscope
due to a 2 ps pulsed YAG laser.
Time Domain
Conversion Gain
1,4
(min into 50
Ω
load)
1300 nm: 20 V/W
1550 nm: 15 V/W
Frequency Domain
DC Responsivity
1,4
(min)
1300 nm
0.3 A/W
–8 dB2
1550 nm
0.3 A/W
–10.5 dB2
Relative Electrical Bandwidth
1
Typical 83440D
Saturation Characteristics
Pulse Width
4,10,14
(calculated:FWHM=0.44/BW
opt
≈0.312/BW
el
)
Bandwidth
4,12,14
< 13 ps FWHM6
dc to 30 GHz nominal (-3dB optical)
Rise/Fall Time
7,10
(10-90%)
<16 ps (calculated)
System Aberrations
4,13 (response to 2 ps FWHM pulse)
20% peak-to-peak max, <12% typical
Noise
5,11
8.1 µW RMS max, equivalent optical noise power
Dark Current
11
20 nA max, 4 nA typical
Maximum Safe Input Optical Power
10 mW (Peak)
+10 dBm (Peak)
Maximum Operating Input Optical Power
(Compression Point)
2 mW (Peak)
+3 dBm (Peak)
See saturation chart for pulsed power characteristics
Input Optical Reflection
8
(HMS-10 optical connector)
0.10 % (1250-1600 nm)
Wavelength Spectral Response
4
1000 nm - 1600 nm
Input Optical Return Loss
8
(HMS-10 optical connector)
>30 dB (1250-1600 nm)
Noise Equivalent Power
5,11
< 18 pW/
√
Hz typical
0.5
0
0
200
400
Peak Optical Power (mW)
5 ps pulse width (1060 nm)
See Notes, page 7
5
Using the Agilent 83440B/C/D
Lightwave Converter
O/E Conversion Process
The 83440 detects the modulated
baseband signal from the lightwave
carrier, converting it to an electrical
signal for processing. The resultant
electrical signal can be analyzed in
the time domain or frequency domain
using electrical oscilloscopes, signal
analyzers, and network analyzers.
The 83440B/C/D are DC coupled
receivers. For proper operation, a
DC path to ground is necessary at
the RF output. When using the 83440
with an AC-coupled instrument
(except opt 050), a bias tee such as
the 11612A is required to supply dc
bias return path. Alternatively, an
attenuator on the output may be
used to provide a dc bias return path.
Supplying +15V to the
83440
Depending on the instruments that
the Agilent 83440 will be used with,
there are several possible configura-
tions to supply the needed +15V bias
voltage to the 83440:
86100B:
Use the 83440-60004 cable
to connect to the +15V supply
at the rear of the 86100B
Agilent Network Analyzers with
Probe Power:
Use the 83440-60006
cable to connect to the Probe Power
Port of the network analyzer.
87421A Power Supply:
Use the
83440-60009 cable in series with the
83440-60004 to connect to the power
supply
11899A Probe Power Supply:
Use
the 83440-60006 cable to connect to
the stand-alone probe power supply.
General Purpose Variable Power
Supply:
Use the 83440-60005 cable
in series with the 83440-60004 cable.
Physical Characteristics
General
RF Connector
ESD Susceptibility at RF Pin
9
DC Bias Voltage
Power Consumption
Weight
Operating Temperature
Compatible Fiber
Photodiode Package
Output Impedance
Calibration
Agilent 83440B/C (3.5 mm [m]) or 83440D (2.4 mm [m]), 50Ω
200 V
+10 to +15V dc required
< 18 mVA
0.14 kg (0.31 lb)
0-55 deg C
9/125 single mode fiber
Hermetically sealed PIN-diode
Unterminated (50Ω terminated for Agilent 83440B Opt 050)
Recommended calibration interval is two years.
Mechanical
83440B/C/D
10.5
21 (0.41)
(0.83)
15
(0.59)
30
(1.2)
6
(0.24)
16.8
(0.66)
45
(1.8)
8.0
(5/16) across flats
105 ±0.2
(4.13)
All dimensions in mm (inches). Weight 0.14 kg (0.31 lb) Bias Port
All tolerances ± 0.1 unless otherwise noted
Center conductor: +10 to +15 vdc
Outer conductor: Common
Connectors
Optical Input:
Specify optical input connector option
when ordering Agilent 83440B/C/D.
81000 AI
Diamond HMS-10
81000FI
FC/PC connector
81000 SI
DIN 47256 connector
81000 VI
ST connector
81000 KI
SC connector
Electrical Output:
3.5 mm (83440B/C)
2.4 mm (83440D)
DC Bias Input:
Quick connect
(LEMO) bias port
ESD Sensitive Parts
9
The 83440 features a captive RF connector
cap to protect the RF center pin from electro-
static discharge (ESD). Use proper ESD precau-
tions when working with RF and bias ports.
Keep RF port capped when not in use.
See Notes, page 7
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