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)
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