Agilent 83440B/C/D
High-Speed
Lightwave Converters
DC-6/20/32 GHz, 1000 to 1600 nm
Product Overview
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 dB
opt
)
• 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 waveforms 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-toelectrical (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
conditioning components. A simple
internal structure ensures very low
signal distortion for improved output
signal fidelity. By eliminating all
unnecessary components along the
signal path, the 83440 family offers
very accurate electrical representations of modulated optical wave-forms.
The 83440 family features hermetically
sealed, unamplified, InGaAs photodiodes. The input opti-cal port features
the Agilent universal optical interface, 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 accurate
pulse parameter characterization.
Broad bandwidth, nearly Gaussian
response characteristics, and low
pulse aberrations make these optical
detectors an excellent choice for highspeed time domain measurements.
Use them with a high-speed digitizing
oscilloscope like the 83480 family to
accurately measure rise and fall
time, overshoot, undershoot, ringing,
pulse amplitude (peak power), pulse
width, amplitude noise, jitter, and
extinction ratio on incoming optical
waveforms. Combine the 50-ohm
termination version of the 83440B,
option 050, with the 87441 family of
fourth-order Bessel-Thomson filters
for SDH/ SONET transmitter eye
diagram measurements.
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.
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
Time Domain Frequency Domain
Conversion Gain
1,4
(min, into 50 Ω load) DC Responsivity
1,4
(min)
1300 nm: 35 V/W 1550 nm: 32.5 V/W 1300 nm 1550 nm
0.70 A/W 0.65 A/W
–3.1 dB
2
–3.7 dB
2
Opt 050: 16.5 V/W 15 V/W 0.33 A/W 0.30 A/W
–9.6 dB
2
–10.5 dB
2
Deflection Factor1(min, Agilent 54120 family oscilloscope)
1300 nm: 29 µW/div 1550 nm: 31 µW/div
Opt 050: 61 µW/div 65 µW/div
Pulse Width
3, 4,10
Bandwidth
3,4
< 73 ps FWHM6(calculated:FWHM=0.44/BW
opt
≈0.312/BW
el
) dc to >6 GHz (-3dB optical)
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
Noise Equivalent Power
5,11
2 µW RMS max, equivalent optical noise power < 18 pW/ √Hz typical
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
Input Optical Return Loss
8
(HMS-10 optical connector) (HMS-10 optical connector)
0.05% (1250-1600 nm) >33 dB (1250-1600 nm)
Wavelength Spectral Response
4
1000 nm - 1600 nm
See Notes, page 7
2
83440B Uncorrected
Pulse System Response
1
83440B Responsivity vs Wavelength
.8
.7
.6
.5
.4
.3
.2
Responsivity (A/W)
.1
0
850 1050 1300 1550
.5
FWHM 50 ps
Relative voltage
Wavelength (nm)
0
–100
0 100
Time (ps)
Response of a Agilent 83440B lightwave
detector on an Agilent 54124 oscilloscope
due to a 2 ps pulsed YAG laser.
13
83440B
Frequency Response
0
–3 dB
elec
–5
electrical
dB
–3 dB
0
–1
dB
–2
optical
opt
–3
–4
–10
0
3
6 9
–5
Frequency (GHz)
Deconvolved frequency response from
2 ps pulsed YAG laser measured by
Agilent 83440B and Agilent 54124 oscilloscope.
Typical 83440B
Saturation Characteristics
1
0.5
Relative Electrical Bandwidth
0
0 500
Peak Optical Power (mW)
5 ps pulse width (1060 nm)
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
Time Domain Frequency Domain
Conversion Gain
1,4
(min, into 50 Ω load) DC Responsivity
1,4
(min)
1300 nm: 35 V/W 1550 nm: 32.5 V/W 1300 nm 1550 nm
0.70 A/W 0.65 A/W
–3.1 dB
2
–3.7 dB
2
Deflection Factor1(min, Agilent 54120 family oscilloscope)
1300 nm: 29 µW/div 1550 nm: 31 µW/div
Pulse Width
3, 4,10
Bandwidth
3,4
< 22 ps FWHM6(calculated:FWHM=0.44/BW
opt
≈0.312/BW
el
) dc to >20 GHz (-3dB optical)
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
Noise Equivalent Power
5,11
3.7 µW RMS max, equivalent optical noise power < 18 pW/ √Hz typical
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
Input Optical Return Loss
8
(HMS-10 optical connector) (HMS-10 optical connector)
0.05% (1250-1600 nm) >33 dB (1250-1600 nm)
Wavelength Spectral Response
4
1000 nm - 1600 nm
See Notes, page 7
83440C Uncorrected
Pulse System Response
1
83440C Responsivity vs Wavelength
.8
.7
.6
.5
.4
.3
.2
Responsivity (A/W)
.1
0
850 1050 1300 1550
.5
Relative voltage
FWHM 20.3 ps
Wavelength (nm)
0
–100
0 100
Time (ps)
Response of a Agilent 83440C lightwave
detector on an Agilent 54124 oscilloscope
due to a 2 ps pulsed YAG laser.
13
83440C
Frequency Response
0
–3 dB
elec
–5
electrical
dB
–3 dB
0
–1
dB
–2
optical
opt
–3
–4
–10
10
0
20 30
–5
Frequency (GHz)
Deconvolved frequency response from
2 ps pulsed YAG laser measured by
Agilent 83440C and Agilent 54124 oscilloscope.
Typical 83440C
Saturation Characteristics
1
0.5
Relative Electrical Bandwidth
0
0 500
Peak Optical Power (mW)
5 ps pulse width (1060 nm)
4
Agilent 83440D
Specifications and Characteristics
Time Domain Frequency Domain
Conversion Gain
1,4
(min into 50 Ω load) DC Responsivity
1,4
(min)
1300 nm: 20 V/W 1550 nm: 15 V/W 1300 nm 1550 nm
0.3 A/W 0.3 A/W
–8 dB
2
–10.5 dB
2
Deflection Factor1(min, Agilent 54120 family oscilloscope)
1300 nm: 50 µW/div 1550 nm: 67 µW/div
Pulse Width
4,10,14
(calculated:FWHM=0.44/BW
opt
≈0.312/BW
el
) Bandwidth
4,12,14
< 13 ps FWHM
6
dc to 30 GHz nominal (-3dB optical)
Rise/Fall Time
7,10
(10-90%)
<15 ps (calculated)
System Aberrations
4,13
(response to 2 ps FWHM pulse)
20% peak-to-peak max, <12% typical
Noise
5,11
Noise Equivalent Power
5,11
8.1 µW RMS max, equivalent optical noise power < 18 pW/ √Hz typical
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
Input Optical Return Loss
8
(HMS-10 optical connector) (HMS-10 optical connector)
0.10 % (1250-1600 nm) >30 dB (1250-1600 nm)
Wavelength Spectral Response
4
1000 nm - 1600 nm
Typical Response Curves
See Notes, page 7
R
l
i
l
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.”
83440D
Uncorrected System Pulse Response
1
83440D Responsivity vs Wavelength
0.5
0.4
0.3
0.2
Responsivity (A/W)
0.1
0
850 1000 1300 1550
tage
.5
ve vo
at
e
FWHM 14.7 ps
Wavelength (nm)
0
–50
0
50
Time (ps)
Response of a Agilent 83440D lightwave
detector on an Agilent 54124 oscilloscope
due to a 2 ps pulsed YAG laser.
13
83440D Frequency Response
40
0
–1
–2
–3
–4
–5
0
–3 dB
elec
–5
electrical
dB
–10
10
0
Deconvolved frequency response from
2 ps pulsed YAG laser measured by
Agilent 83440D and Agilent 54124 oscilloscope.
Frequency (GHz)
–3 dB
20 30
opt
dB
optical
100
Typical 83440D
Saturation Characteristics
1
0.5
Relative Electrical Bandwidth
0
0 200 400
Peak Optical Power (mW)
5 ps pulse width (1060 nm)
Using the Agilent 83440B/C/D
Lightwave Converter
Each 83440 is shipped with
instrument-specific frequency
response and conversion gain
(dc responsivity) data.
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 ouput. 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, a 3 dB
fixed attenuator on the output may be
used to provide a dc bias return.
5
General
RF Connector Agilent 83440B/C (3.5 mm [m]) or 83440D (2.4 mm [m]), 50Ω
ESD Susceptibility at RF Pin
9
200 V
DC Bias Voltage +10 to +15V dc (Available from Agilent 54121/4 test set bias port
or Agilent 87421 Power Supply with 83440-60009 bias cable)
For use with ac-coupled instruments a bias tee such as
Agilent 11612A is required to supply dc bias return path.
Power Consumption < 18 mVA
Weight 0.14 kg (0.31 lb)
Operating Temperature 0-55 deg C
Compatible Fiber 9/125 single mode fiber
Photodiode Package Hermetically sealed
Output Impedance Unterminated/50Ωterminated for Agilent 83440B Opt 050
Agilent 83440B Opt 050, –15 dB return loss, nominal
Calibration Recommended calibration interval is two years.
See Notes, page 7
Eye-Pattern
Measurements
Eye-pattern transmitter tests are
called for in CCITT (International
Telegraph and Telephone Consultative
Committee) G.957 and in EIA/TIA
OFSTP-4 (Electronics Industry
Association/Telecommunications
Industry Association Fiber Standard
Test Procedure) for SDH and SONET.
The 83440 family may be used with
the 87441 SDH/SONET filters to
perform these measurements. The
83440B option 050 is terminated
in 50 ohms to prevent reflections
between the receiver’s output and the
filter’s input to maintain the fourthorder Bessel-Thomson response.
An input optical signal of at least –4
dBm is recommended to produce
an adequate eye pattern on a 83480
digital communications analyzer.
Standard 83440 lightwave converters,
which are unterminated, require a
6-dB attenuator between the
converter output and the filter to
provide reasonable match with the
87441. While this helps to achieve
good frequency response, overall
sensitivity is significantly reduced.
The 83440B/C/D may be used with
the electrical measurement channels
on the 83480A digital communications analyzer. Fully calibrated,
integrated, optical channels are also
available with the 83480A.
83440C Response Chart
S/N: 1234567890
Frequency Response Relative to dc
Frequency Response
0
–3 dB
elec
–5
electrical
–3 dB
10
Frequency (GHz)
(V/W)
1300 nm 39.5
1550 nm 37.5
opt
20
dB
–10
0
dc Responsivity into 50 ohms
Date: 7 DEC 1990
0
–1
Freq
(GHz)
dB
–2
optical
.13
.53
–3
.92
1.32
1.72
–4
2.12
2.51
2.91
–5
30
3.31
3.71
4.10
4.50
4.90
5.30
5.69
6.09
6.49
6.89
7.28
7.68
8.08
8.48
8.87
9.27
9.67
10.07
(Electrical dB)
Amp 1
(GHz)
(dB)
10.46
–.1
10.86
–.1
11.26
–.2
11.65
–.2
12.05
–.3
12.45
–.4
12.85
–.4
13.24
–.5
13.64
–.5
14.04
–.6
14.44
–.7
14.83
–.8
15.23
–.8
15.63
–.9
16.03
–1.0
16.42
–1.0
16.82
–1.1
17.22
–1.1
17.62
–1.2
18.01
–1.3
18.41
–1.3
18.81
–1.4
19.21
–1.4
19.60
–1.5
20.00
–1.6
Freq
Amp 1
(dB)
–1.6
–1.7
–1.7
–1.8
–1.9
–1.9
–2.0
–2.0
–2.1
–2.2
–2.3
–2.3
–2.4
–2.5
–2.5
–2.6
–2.6
–2.7
–2.8
–2.8
–2.9
–2.9
–3.0
–3.1
O E Conversion Process
Input Optical
Signal
P
t
Baseband modulated
on lightwave carrier
Source
Output Elec.
Signal
i
83480A
Digital
Communications
Analyzer
t
Baseband
modulation only
83440B/C/D
Mechanical
Connectors
Optical Input: Electrical Output:
Specify optical input connector option 3.5 mm (83440B/C)
when ordering Agilent 83440B/C/D. 2.4 mm (83440D)
Diamond HMS-10 Opt 011 DC Bias Input: 2 quick connect
FC/PC connector Opt 012 bias cables: SMB (Agilent 54120
DIN 47256 connector Opt 013 compatible) connector to 83440 and
ST connector Opt 014 bare leads (clear: +, black: com) to
Biconic connector Opt 015 83440.
Contents:
• One 83440 Lightwave Detector with response data sheet
• User specified optical connector adapter
• Two dc bias cables
Ordering Information
Agilent 83440B DC-6 GHz Lightwave Converter
Option 050, 50Ω termination for use with SDH/SONET filters
Agilent 83440C DC-20 GHz Lightwave Converter
Agilent 83440D DC-32 GHz Lightwave Converter
Note: All 83440 orders must specify an optical connector option.
Recommended Accessories
Agilent 87421A DC Power Supply (For non 54120 applications)
Agilent 83440-60009 Power supply bias cable for 87421A
Agilent 11612A Bias network (for AC-coupled applications)
Agilent 5952-9654 Fiber Optics Handbook
Agilent 8493C Opt 003, 006 3 and 6 dB fixed attenuators
Agilent 83440-60004 Additional DC bias cable (83440-SMB)
Agilent 83440-60005 Additional DC bias cable (SMB-bare wire)
Agilent 11901D 2.4 mm (f) to 3.5 mm (m) Coax Adapter
Agilent 1250-1391 SMB tee to expand 54120 oscilloscope test set bias output
Agilent 87441A/B/D Fourth-order Bessel-Thomson SDH/SONET filter for
STM-16/OC-48 eye-diagram measurements
Agilent 87490A Mask Measurement Software for the 54120
Optical Connector Adapters
Use to transform the 83440 to the connector of interest for increased measurement
versatility. One supplied with each 83440, depending upon option specified.
Agilent 81000AI HMS-10 connector adapter (same as Opt 011)
Agilent 81000FI FC/PC connector adapter (same as Opt 012)
Agilent 81000GI D4 connector adapter
Agilent 81000JI SMA connector adapter
Agilent 81000UI SC connector adapter
Agilent 81000SI DIN 47256 connector adapter (same as Opt 013)
Agilent 81000VI ST connector adapter (same as Opt 014)
Agilent 81000WI Biconic connector adapter (same as Opt 015)
6
ESD Sensitive Parts
9
The 83440 features a captive RF
connector cap to protect the RF
center pin from electrostatic discharge
(ESD). Use proper ESD precautions
when working with RF and bias ports.
Keep RF port capped when not in use.
83440B/C/D
10.5
(0.41)
21
(0.83)
30
(1.2)
15
(0.59)
6
(0.24)
All dimensions in mm (inches). Weight 0.14 kg (0.31 lb)
All tolerances ± 0.1 unless otherwise noted
105 ±0.2
(4.13)
45
(1.8)
Bias Port
Center conductor: +10 to +15 vdc
Outer conductor: Common
8.0
(5/16) across flats
16.8
(0.66)
Notes
1
Stated specs from 83440B/C /D into 50Ω load.
2
For an O/E device, responsivity (dB) = 20log
[
responsivity A/W
]
1 A/W
3
Measured on 8703A lightwave component analyzer. Frequency response verified by deconvolving impulse response of 83440C on 54124 oscilloscope due to a 2 ps pulse YAG laser.
4
See typical performance trace.
5
Thermal noise limited; equivalent optical power limited by 50 Ω input impedance.
6
Full-Width Half-Max.
7
Calculated from bandwidth measurements; tr =
.48
,(≈
.34
) Calculation assumes
Gaussian pulse.
BW
opt BWelec
8
Optical connector limited.
9
ESD susceptibility limited to RF connector center pin. Overall package (other than bias port and
RF connector) withstands >25,000 V ESD.
10
Impulse response calculations verified using 2 ps pulsed YAG laser.
11
At room temperature ( 23°C ± 3°C)
12
All 83440D units are tested for 30 GHz minimum bandwidth. Measured frequency response
data is supplied with each unit.
13
Uncorrected System aberrations include oscilloscope response and source laser aberrations
from 2 ps pulsed YAG laser system. Slower pulse width will generate lower aberration levels;
high 83440D detector bandwidth can excite 50 GHz oscilloscope response.
14
83440D test system consists of 2-3 ps compressed Nd:YAG laser and 54124 50 GHz
digitizing oscilloscope. 83440D frequency response is derived from Fourier transform after
correcting for oscilloscope and input pulse frequency response. System verified with YAG
heterodyne.
Other Agilent O/E Converters
Agilent 11982A DC-15 GHz amplified converter. 300 V/W conversion
gain. Product Overview lit. no. 5966-1583E.
Agilent 83410B 300 kHz-3 GHz amplified receiver (9-62.5/125 µm
fiber). Technical Specifications lit. no. 5965-6404E.
Agilent 83411A 300 kHz-6 GHz receiver (9/125 µm fiber).
Technical Specifications lit. no. 5965-6404E.
Agilent 83411B 300 kHz-6 GHz amplified receiver (9/125 µm
fiber). Technical Specifications lit. no. 5965-6404E.
Agilent 83412A 300 kHz-3 GHz amplified receiver (850 nm) (50/125 µm
fiber). Technical Specifications lit. no. 5965-6404E.
Agilent 83446A/B 2.4 Gb/s, 622 Mb/s lightwave clock and data receiver.
Product Overview lit. no. 5962-1682E.
Agilent 83481A 3 GHz, 155 Mb/s, 622 Mb/s optical/electrical module.
Product Overview lit. no. 5964-2238E.
Agilent 83485A/B 20 GHz, 30 GHz, 2.4 Gb/s, 10 Gb/s optical/electrical
module. Product Overview lit. no. 5964-2238E.
7
For more information about Agilent Technologies
test and measurement products, applications,
services, and for a current sales office listing,
visit our web site,
www.agilent.com/comms/lightwave
You can also contact one of the
following centers and ask for a test and
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Technical data subject to change
Copyright © 1991, 1992, 1996
Agilent Technologies
Printed in U.S.A. 4/00
5091-5536E
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