20 GHz and 26.5 GHz Multimode
Lightwave Component Analyzer
Data Sheet
General Information
Key benefits
Agilent’s N4376B Lightwave Component Analyzer (LCA) is
the instrument of choice to test short wavelength 10G Ethernet, Fibre Channel FCx8, FCx10 and FCx16 electro-optical
components, with up to 20 or 26.5 GHz modulation range.
The N4376B also supports the test of transmitter and receivers for optical computer backplanes and optical chip-to-chip
connections in high speed computers and server applications.
Modern optical transmission and datacom systems require
fast, accurate and repeatable characterization of the core
electro-optical components. These core subcomponents
(lasers, modulators and detectors) have significant impact
on the performance of the transmitter and the receiver with
respect to modulation bandwidth, jitter, gain, and distortion
of the final transceiver.
For frequency dependent responsivity measurements
the N4376B extends opto-electronic S-parameter measurements to multimode devices in the 850 nm wavelength range, which was not possible with the standard
8703A/B LCA 8703A/B.
With a completely new design of the optical test set and a
new RF-switched architecture, together with the latest PNA
family of network analyzers, the N4376B guarantees excellent electro-optical measurement performance. In addition
a unique new calibration concept significantly reduces time
from powering up the LCA until the first calibrated measurement can be made. This increases productivity in R&D and
on the manufacturing floor.
The fully integrated “turnkey” solution reduces time to market, compared to the time-consuming development of a selfmade setup.
By optimizing the electrical and optical design of the N4376B
for lowest noise and ripple, the accuracy has been improved
by more than a factor of 3 and is now independent of the
electrical reflection coefficient of the device under test.
It’s the excellent accuracy that improves the yield from tests
performed with the N4376B, by narrowing margins needed
to pass the tested devices. Traceability ensures worldwide comparability of test results.
The advanced optical design together with temperaturestabilized transmitter and receiver ensures repeatable measurements over days without recalibration.
Using the advanced measurement capabilities of the network analyzer, all S-parameter related characteristics of the
device under test, like responsivity, ripple and 3dB-cutoff
frequency, can be qualified with the new N4376B Lightwave
Component Analyzer from 10 MHz to 20/26.5 GHz.
Traceable multimode S21 test, right at 850 nm target
IEEE 802.3ae launched power distribution leads to test
results comparable to the final application
Fast and easy measurement setup and calibration for
all standard tests
High confidence and fast time-to-market with a traceable turnkey solution.
Significantly increased productivity using the fast and
easy measurement setup with an unique new calibration process leads to lower cost of test.
Test right at target launch condition eliminates test
Identical LCA software and remote control across the
N437xB family simplifies integration
Relative frequency response uncertainty @ 20GHz:
± 1.5 dB
± 1.0 dB (typical)
Absolute frequency response uncertainty @ 20GHz:
± 2.0 dB (typ.)for E/O measurements
± 1.8 dB (typ.)for O/E measurements
Noise floor @ 20GHz:
-69 dB W/A for E/O measurements
-68 dB A/W for O/E measurements
Transmitter wavelength:
850 nm ± 10 nm
Supported connectors
LC or SC straight
Built-in optical power meter
For fast transmitter power verification
Powerful remote control:
State of the art programming interface based on Microsoft
.NET or COM.
1 year warranty is standard for N4376B Lightwave Component Analyzer;
Extension to 3 years available.
The network analyzer
The N4376B comes in two basic versions. The economic line
is based on a PNA-L network-analyzer and is available as a 2
port system. The high end version is based on the new PNAX and, extended optical modulation index (OMI) and is available with 2 or4 ports. The PNA-X based LCA is calibrated up
to 26.5 GHz.
Agilent N4376B Applications
Agilent N4376B Features
In digital photonic transmission systems, the performance
is ultimately determined by bit error ratio test (BERT), which
describes the performance of the whole system. However
it is necessary to design and qualify subcomponents like
modulators and receivers, which are analog by nature, with
different parameters. Those parameters are core to the overall system performance.
These electro-optical components significantly influence the
overall performance of the transmission system via the following parameters:
‡ 3dB bandwidth of the electro-optical transmission
‡ Relative frequency response, quantifying the electrooptical shape of the conversion.
‡ Absolute frequency response, relating to the conversion efficiency of signals from the input to the output,
or indicating the gain of a receiver.
‡ Electrical reflection at the RF port
Only a careful design of these electro-optical components
over a wide modulation signal bandwidth guarantees successful operation in the transmission system.
Turnkey solution
In today’s highly competitive environment, short time-tomarket with high quality is essential for new products. Instead of developing a home-grown measurement solution
which takes a lot of time and is limited in transferability and
support, a fully specified and supported solution helps to focus resources on faster development and on optimizing the
manufacturing process.
In the N4376B all optical and electrical components are
carefully selected and matched to each other to minimize
noise and ripple in the measurement traces. Together with
the temperature stabilized environment of the core components, this improves the repeatability and the accuracy
of the overall system. Extended factory calibration data at
various optical power levels ensures accurate and reliable
measurements that can only be achieved with an integrated
solution like the N4376B.
Easy calibration
An LCA essentially measures the conversion relation between optical and electrical signals. This is why user calibration of such systems can evolve into a time consuming
task. With the new calibration process implemented in the
N4376B, the tasks that have to be done by the user are reduced to one pure electrical calibration. The calibration with
an electrical microwave calibration module is automated
and needs only minimal manual interaction.
Electro-optical components
The frequency response of amplified or unamplified detector
diodes, modulators and directly modulated lasers typically
depends on various parameters, like bias voltages, optical
input power, operating current and ambient temperature. To
determine the optimum operating point of these devices, an
LCA helps by making a fast characterization of the electrooptic transfer function while optimizing these operating
conditions. In parallel the LCA also measures the electrical
return loss.
In manufacturing it is important to be able to monitor the
processes regularly to keep up the throughput and yield. In
this case the LCA is the tool of choice to monitor transmission characteristics and absolute responsivity of the manufactured device. The remote control of the N4376B offers another tool to improve the productivity by making automated
measurements and analysis of the measured data.
Built-in performance verification
Sometimes it is necessary to make a quick verification of the
validity of the calibration and the performance of the system.
The N4376B’s unique calibration process allows the user to
perform a self-test without external reference devices. This
gives full confidence that the system performance is within
the user’s required uncertainty bands.
State-of-the-art remote control
Testing the frequency response of electro-optical components under a wide range of parameters, which is often
necessary in qualification cycles, is very time consuming.
To support the user in minimizing the effort for performing this huge number of tests, all functions of the LCA can
be controlled remotely via LAN over the state-of-the-art
Microsoft .NET or COM interface.
Based on programming examples for VBA with Excel, Agilent VEE and C++, it is very easy for every user to build applications for their requirements.
These examples cover applications like integration of complete LCA measurement sequences.
Electrical components
Electrical components such as amplifiers, filters and transmission lines are used in modern transmission systems and
require characterization to ensure optimal performance. Typical measurements are bandwidth, insertion loss or gain, impedance match and linearity. The new switched architecture
offers direct access to the electrical outputs and inputs of
the network-analyzers just by selecting electrical- to electrical measurement mode in the LCA user interface.
Integrated optical power meter
In applications where optical power dependence characterization is needed, the average power meter can be used to
set the exact average output power of the LCA transmitter
by connecting the LCA optical transmitter output, optionally
through an optical attenuator, to the LCA optical receiver input. By adjusting the transmitter output power in the LCA
user interface or the optical attenuation, the desired transmitter optical power can be set.
In cases where an unexpectedly low responsivity is measured from the device under test, it is very helpful to get a
fast indication of the CW optical power that is launched into
the LCA receiver. The cause might be a bad connection or a
bent fiber in the setup. For this reason too, a measurement
of the average optical power at the LCA receiver is very helpful for fast debugging of the test setup.
Selectable output power of the transmitter
Most PIN diodes and receiver optical subassemblies (ROSA’s) need to be characterized at various average optical
power levels. In this case it is necessary to set the average
input power of the device under test to the desired value.
The variable average optical output power of the LCA transmitter offers this feature. Together with an external optical
attenuator, this range can be extended to all desired optical
power levels.
Large signal measurements
LCA S21 measurements are typically small-signal linear
transfer function measurements. If an electro-optical component must be tested under large signal conditions, normal
balanced measurements might lead to wrong measurement
The PNA-X based version of the LCA offers true balanced
measurements for differential ports by offering two independent high power RF sources. With this setup the LCA measures the correct S21 transfer function of E/O components,
even in the nonlinear regime.
To stimulate O/E components like PIN-TIA receivers under
optical large signal conditions, the PNA-X based LCA offers
a variable optical modulation index > 50%.
IEEE 802.3ae multimode launch condition
Multimode measurements are typical much more critical
regarding repeatability and stability than single mode measuremts. To minimize these effects it is necessary to have
well defined and stable mode filling of the transmitter fiber.
The N4376B has typical multimode launch conditions or
power-distribution in the transmitter fiber as defined by the
IEEE 802.3ae standard.
The IEEE 802.3ae power-distribution compliance of the
N4376B transmitter leads to application realistic and repeatable test results.
Explanation of terms
Generally, all specifications are valid at the stated operating and measurement conditions and settings, with uninterrupted line voltage.
For electro-optical devices (e.g. modulators ) this describes
the ratio of the optical modulated output signal amplitude
compared to the RF input amplitude of the device.
For opto-electrical devices (e.g. photodiodes) this describes
the ratio of at the RF amplitude at the device output to the
amplitude of the modulated optical signal input. .
Specifications (guaranteed)
Describes warranted product performance that is valid under
the specified conditions.
Specifications include guard bands to account for the expected statistical performance distribution, measurement
uncertainties changes in performance due to environmental
changes and aging of components.
Relative frequency response uncertainty
Describes the maximum deviation of the shape of a measured trace from the (unknown) real trace. This specification
has strong influence on the accuracy of the 3-dB cut-off frequency determined for the device under test.
Typical values (characteristics)
Characteristics describe the product performance that is
usually met but not guaranteed. Typical values are based on
data from a representative set of instruments.
Absolute frequency response uncertainty
Describes the maximum difference between any amplitude
point of the measured trace and the (unknown) real value.
This specification is useful to determine the absolute responsivity of the device versus modulation frequency.
General characteristics
Give additional information for using the instrument. These
are general descriptive terms that do not imply a level of
Frequency response repeatability
Describes the deviation of repeated measurement without
changing any parameter or connection relative to the average of this measurements.
Minimum measurable frequency response
Describes the average measured responsivity when no modulation signal is present at the device under test. This represents the noise floor of the measurement system.
Definition of LCA input and output names
LCA electrical port A
LCA electrical port B
LCA optical output
LCA optical input
Agilent N4376B Specifications
Measurement capabilities
3dB cut-off frequency (S21),
Responsivity (S21),
Electrical reflection (S11 or S22),
Insertion Loss (IL),
Transmission bandwidth,
all electrical S-parameter measurements.
Measurement conditions
‡ Modulation frequency range from 10 MHz to 20.0 GHz
‡ Foreward RF power +3 dBm
‡ Reverse RF power 0 dBm
‡ 100 Hz IFBW (“Reduce IF bandwidth at low frequency”
enabled) with modulation frequency step size 10 MHz
and measurement points on a 10 MHz raster (if not
differently stated)
‡ Network analyzer set to “stepped sweep – sweep
moves in discrete steps”
‡ All network-analyzer ports configured in standard
coupler configuration (“CPLR ARM” to “RCVB B in”,
‡ After full two-port electrical calibration using an
Electronic Calibration Module, Agilent N4691B, at
constant temperature (±1° C)
‡ Modulator bias optimization set to “continous sweep”
‡ Measurement frequency grid equals electrical
calibration grid
‡ DUT signal delay ≤ 0.1/IF-BW
‡ Specified temperature range: +20° C to +26° C.
‡ After warm-up time of 90 minutes
‡ Using high quality electrical and optical connectors
and RF cables in perfect condition
‡ 50 μm FC/APC to FC/PC patchcord at the input and
‡ Launched power distribution according to
IEEE 802.3ae - 2002, see fig 1
‡ Test performed using an optical reference source with
return loss better 45 dB, spectral width FWHM
< 10MHz and InGaAs detector
Target test devices
Transmitter (E/O)
Receiver (O/E)
‡ PIN diodes
‡ Avalanche photodiodes (APD)
‡ Receiver optical subassemblies (ROSA)
Optical (O/O)
‡ Passive optical components
‡ Optical multimode fibers
‡ Optical transmission systems
percent power in radius [%]
Fig 1; IEEE 802.3ae launch conditions measured with 3 examples
Transmitter and Receiver Specifications
Optical Test set
Option -322, -382
Option -312, -314, -392, -394
Operation frequency range
10 MHz to 20 GHz
10 MHz to 26.5 GHz
Connector type
(optical testset)
optical input
62.5 μm MMF angled with Agilent versatile connector interface
optical output
50 μm MMF angled with Agilent versatile connector interface
3.5 mm male
LCA optical input
Operating input wavelength range
750 nm to 1650 nm
Optical input:
-1 dBm
Maximum safe average input power
Optical input:
+3 dBm
Optical return loss (typ.) [f1]
> 14 dB
Average power measurement range[f1]
Optical input:
Average power measurement
uncertainty (typ.) [f1]
±0.7 dBo
Maximum linear average input power
-25 dBm to -1 dBm
LCA optical output
Optical modulation index (OMI)
at 10 GHz (typ.)
25 % @ +3 dBm RF (typ.)
31 % @ +5 dBm RF (typ.)
Output wavelength
(850 ± 10) nm
Lauched Power Distribution (typical)
according to IEEE 802.3ae - 2002
Average output power range
-5 dBm to -1 dBm
Average output power uncertainty (typ.)
±0.7 dBo
Average output power stability,
15 minutes (typ.)
±0.5 dBo
[f1] Wavelength within range as specified for LCA optical output
[f2] After modulator optimization
Specifications for electrical-electrical measurements (E/E mode)
For detailed specification of the network analyzer see corresponding data sheet.
N4376B: option -322, -382
N5230C -225
option -312, -392
N5242A -200
option -314, -394
N5242A -400
Optical test set
Electrical loss of optical test set
< 2.0 dBe (typ.)
Specifications for electro-optical measurements at 850 nm
N4376B system with network analyzer
(E/O mode)
N5230C -225
N5242A -200
N5242A -400
Specifications are valid under the stated measurement conditions.
‡ For wavelength:
(850 ±10) nm
System performance
Relative frequency
response uncertainty
0.05 GHz to 0.2 GHz
0.2 GHz to 10 GHz
10 GHz to 20 GHz
≥ -26 dB(W/A) [f1]
±1.0 dBe typ.
±1.3 dBe
(±0.9 dBe typ)
±1.5 dBe
(±1.0 dBe typ)
≥ -36 dB(W/A)
±1.0 dBe typ.
±0.9 dBe typ.
±1.0 dBe typ.
≥ -46 dB(W/A)
±1.1 dBe typ.
±0.9 dBe typ.
±1.3 dBe typ.
±2.0 dBe .
±2.0 dBe
≥ -26 dB(W/A) [f1]
±0.1 dBe
±0.1 dBe
±0.1 dBe
≥ -36 dB(W/A)
±0.15 dBe
±0.1 dBe
±0.15 dBe
-65 dB(W/A)
-82 dB(W/A)
-69 dB(W/A)
DUT response
Absolute frequency
response uncertainty
DUT response
Frequency response
repeatability (typ.)
DUT response
≥ 26 dB(W/A) [f1]
Minimum measurable frequency
response (noise floor ) [f2] [f4]
For DUT optical peak output power ≤ +0 dBm.
IFBW = 10 Hz.
Note: average value over frequency range.
Specifications for opto-electrical measurements at 850 nm
N4376B system with network analyzer
(O/E mode)
N5230C -225
N5242A -200
N5242A -400
Specifications are valid under the stated measurement conditions.
‡ For wavelength:
(850 ±10) nm
System performance
Relative frequency
response uncertainty
0.05 GHz to 0.2 GHz
0.2 GHz to 10 GHz
10 GHz to 20 GHz
≥ -21 dB(A/W) [f1]
±1.0 dBe typ.
±1.3 dBe
(±0.9 dBe typ)
±1.5 dBe
(±1.0 dBe typ)
≥ -31 dB(A/W)
±1.0 dBe typ.
±0.9 dBe typ.
±1.1 dBe typ.
≥ -41 dB(A/W)
±1.2 dBe typ.
±0.9 dBe typ.
±1.5 dBe typ.
±1.9 dBe
±1.7 dBe
±1.8 dBe
≥ -21 dB(A/W) [f1]
±0.25 dBe
±0.1 dBe
±0.2 dBe
≥ -31 dB(A/W)
±0.3 dBe
±0.1 dBe
±0.25 dBe
-58 dB(A/W)
-77 dB(A/W)
-68 dB(A/W)
DUT response
Absolute frequency
response uncertaint
DUT response
Frequency response
repeatability (typ.)
DUT response
≥ 21 dB(A/W) [f1]
Minimum measurable frequency
response (noise floor ) [f3] [f4]
For DUT response max +15 dB (A/W)
Output power set to -1 dBm
IFBW = 10 Hz.
Note: average value over frequency range
Specifications for optical-optical measurements at 850 nm
N4376B system with network analyzer
(O/O mode)
N5230C -225
N5242A -200
N5242A -400
Specifications are valid under the stated measurement conditions.
‡ For wavelength:
(850 ±10) nm
System performance
Relative frequency
DUT response
Absolute frequency
response uncertainty
DUT response
Frequency response
repeatability (typ.)
DUT response
≥ -10 dBe [f1] [f2]
(≥ -5.0 dBo)
≥ -10 dBe [f1][f2]
(≥ -5 dBo)
≥ -10 dBe [f1] [f2]
(≥ -5 dBo)
Minimum measurable frequency
response (noise floor ) [f2] [f3] [f4]
0.05 GHz to 0.2 GHz
0.2 GHz to 10 GHz
10 GHz to 20 GHz
±0.5 dBe typ.
(±0.25 dBo)
±0.4 dBe
(±0.2 dBo)
±0.5 dBe
(±0.25 dBe)
±1.1 dBe
±1.0 dBe
±1.0 dBe
±0.15 dBe
±0.1 dBe
±0.15 dBe
-53 dBe
(-26.5 dBo)
-70 dBe
(-35 dBo)
-44 dBe
(-22 dBo)
For DUT response max. 0 dB
Average power from LCA optical output set to -1 dBm.
IFBW = 10 Hz.
Note: average value over frequency range.
General Characteristics
Shipping contents
1x Network-analyzer depending on option selected
1x N4376B optical test set
2x 81000 NI optical adaptor
1x 4376B-90A01 Getting started
1x 4375B-90CD1 LCA support CD
1x 1150-7896 Keyboard
1x 1150-7799 Mouse
1x 8121-1242 USB cable
1x E5525-10285 UK6 report
1x N4373-61627 electrical short cut cable
1x 9320-6677 RoHS addendum for Photonic T&M
1x 9320-6654 RoHS addendum for Photonic T&M products
Assembled dimensions: (H x W x D)
-312, -314
41.3 cm x 43.8 cm x 53.8 cm,
(16.3 in x 17.3 in x 21.2 in)
41.3 cm x 43.8 cm x 47.3 cm,
(16.3 in x 17.3 in x 18.7 in)
Product net weight:
36 kg (79.4 lbs)
46 kg (101.4 lbs)
34 kg (74.9 lbs)
Packaged product:
56 kg (123.5 lbs)
66 kg (145.7 lbs)
54 kg (119 lbs)
Power Requirements
100 to 240 V~, 50 to 60 Hz
2 power cables
max. 350 VA
max 450 VA
Optical test set: max. 40 VA
Additional, option dependent shipping contents:
-023 2x LC 50μm to FC/APC 0.5 m patch cord
-024 2x LC 62.5μm to FC/APC 0.5 m patch cord
-025 2x SC 50μm to FC/APC 0.5 m patch cord
-026 2x SC 62.5μm to FC/APC 0.5 m patch cord
-312, 322 2 port LCA:
1x E7342-60004 0.5 m (m) to (f) high performance RF cable
-314 4 port LCA:
2x E7342-60004 0.5 m (m) to (f) high performance RF cable
Option 312
N5242A -200
Option 314
N5242A -400
Option 322
N5230C- 225
LCA connector types [1]
Optical test set
LCA port A
LCA port B
LCA optical input
Storage temperature range
-40° C to +70° C
Operating temperature range
+5° C to +32° C
LCA optical output
15 % to 80 % relative humidity, non-condensing
3.5 mm (m)
3.5 mm (m)
62.5 μm single-mode angled [1],
with Agilent universal adapter
50 μm single-mode angled[1],
with Agilent universal adapter
The optical test set always has angled connectors.
For input and output a 50 μm or 62.5 μm angled to straight
LC or SC patchcord must be selected The connection to the
DUT is always either LC or SC straight.
Altitude (operating)
0 ... 2000 m
The jumper cable must always be used in front of the optical
testset to protect the connectors of the optical testset.
Recommended re-calibration period
1 year
Laser Safety Information
All laser sources listed above are classified as Class 1M
according to IEC 60825 1 (2001).
All laser sources comply with 21 CFR 1040.10 except for
deviations pursuant to Laser Notice No. 50,
dated 2001-July-26.
Mechanical Outline Drawings, option -322, -382 (all dimensions in mm)
Mechanical Outline Drawings, option -312, -314, -392, -394 (all dimensions in mm)
Ordering informations
The N4376B consists of an optical test set and an electrical network analyzer which are mechanically connected.
To protect your network analyzer investment, Agilent offers the integration of an already owned PNA-L or PNA-X with the
optical test set as listed below.
All systems have 1 year warranty.
N4376B LCA ordering options
Network-analyzer options
N4376B - 312
20 GHz 2 port LCA based on N5242A -200
N4376B - 314
20 GHz 4 port LCA based on N5242A -400
N4376B - 322
20 GHz 2 port LCA based on N5230C -225
Network-analyzer integration options
N4376B - 382
Integration of customer PNA-L
- N5230A/C -220, -225
N4376B - 392
Integration of customer PNA- X
- N5242A -200,
- N5242A -219 (all specifications typical,
max Bias-T voltage 7V, max current 200mA)
N4376B - 394
Integration of customer PNA- X
- N5242A -400,
- N5242A -419 (all specifications typical,
max Bias-T voltage 7V, max current 200mA)
Wavelength options
N4376B - 103
850 nm optical testset
Other options
N4376B - 010
Time domain
N4376B - 023
LC 50μm connector interface (external 0.75 m patch cord)
N4376B - 024
LC 62.5μm connector interface (external 0.75 m patch cord)
N4376B - 025
SC 50μm connector interface (external 0.75 m patch cord)
N4376B - 026
SC 62.5μm connector interface (external 0.75 m patch cord)
Service and Repair
1 year Return-to-Agilent warranty extended to 3 years
Agilent calibration up front support plan 3 year coverage
Required accessories (to be ordered separately)
2 port microwave electrical calibration module
( -00F recommended)
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