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LIV Test of Laser Diode Using the
Agilent B2900A Series of SMUs
Technical Overview
Agilent B2901/02/11/12A Precision Source/Measure Unit
Agilent B2901A Precision SMU, 1ch, 100 fA resolution, 210 V, 3 A DC/10.5 A pulse
Agilent B2902A Precision SMU, 2ch, 100 fA resolution, 210 V, 3 A DC/10.5 A pulse
Agilent B2911A Precision SMU, 1ch, 10 fA resolution, 210 V, 3 A DC/10.5 A pulse
Agilent B2912A Precision SMU. 2ch, 10 fA resolution, 210 V, 3 A DC/10.5 A pulse
Introduction
High force High force
The light-current-voltage (LIV) sweep
test is a fundamental measurement Low force Low force
LD PD
to determine the operating character-
istics of a laser diode (LD). In the LIV
test, current applied to the laser diode
is swept and the intensity of the
resulting emitted light is measured
using a photo detector (PD). Ch1 Ch2
The Agilent B2901/02/11/12A B2902A or B2912A
Precision Source/Measure Unit is a (a) Physical connection of the LIV test using the B2900A Series of SMUs.
compact and cost-effective bench-top
Source/Measure Unit (SMU) with the
IL Ip
capability to output and measure both DUT Detector
voltage and current. It covers currents
from 10 fA to 3 A (DC)/10.5 A (pulse) LD PD
and voltages from 100 nV to 210 V,
V VL Vp
which enables you to make a wide
A
range of current versus voltage (IV)
measurements more accurately and
quickly than ever before. In addition,
the B2900A Series of SMUs comes CH1 CH2
with an intuitive graphical user I sweep/V measure V force/I measure
interface (GUI) and free PC-based
(b) Operating mode of each channel for the LIV test.
application software that make it easy
for you to begin making productive Figure 1. Using the B2900A Series of SMUs to perform the LIV test of laser diodes
measurements immediately. These
features make the B2900A Series
of SMUs the best solution for LIV accurate IV measurement capabilities As shown in Figure 1, using the
testing of laser diodes. as well as the ability to supply either B2902A or B2912A, you can easily
constant or swept voltage/current. the measure the LIV characteristics of
The B2902A and B2912A have two SMU B2902A and B2912A excellent choices laser diodes, including tests such as
channels, and each channel possesses for laser diode LIV testing. a laser forward voltage, threshold
voltage and slope efficiency.
What is the B2900A
1) Set the measurement
Series of SMUs? condition and the compliance for Ch 1
An SMU combines the capabilities
of a current source, a voltage source,
a current meter and a voltage meter
along with the capability to switch
easily between these various func-
tions into a single instrument. This
gives it the ability to evaluate the IV
characteristics of devices across all
four measurement quadrants without
the need for any additional equip- a) Single view for Ch1
ment. Besides being able to output
and measure voltage or current very 2) Set the measurement
accurately, SMUs also possess a condition and the compliance for Ch2
compliance feature that allows a limit
to be placed on the voltage or current
output to prevent device damage. The
members of the B2900A Series of
SMUs are single or dual channel SMU
units that offer a wide range of IV
measurement capability for a variety
of two-terminal and three-terminal
devices. They cover currents from
10 fA to 3 A (DC)/10.5 A (pulse) and 3) Execute and see b) Single view for Ch2
voltages from 100 nV to 210 V. In the result
addition to their DC operation mode,
the B2900A Series of SMUs also
has the ability to perform pulsed
measurements in order to prevent
device self-heating from distorting
the measurement results.
c) Graph view
Figure 2. The GUI of the B2900A Series of SMUs makes it easy to take a quick
measurement and display the results
2
Quick and Easy IV The B2900A Series of SMUs has a B2900A Graphical Web Interface
USB interface on the front panel so and the Agilent B2900A Quick I/V
Characterization that a USB flash memory device can Measurement Software are both
During routine device evaluation it be used with the B2900A Series of available for the B2900A Series of
is often desirable to make a quick SMUs to save and load measurement SMUs.
measurement from the instrument's setups as well as to save measure-
front panel without having to go ment results. In addition, Graph View The Agilent B2900A Graphical Web
through the time and trouble of supports a Screen Dump function that Interface provides functionality to
writing a test program. To meet this enables you to save screen images allow access to the B2900A Series
need, the B2900A Series of SMUs has (such as IV curves) to any attached of SMUs over a LAN connection. The
a resident GUI that makes it easy to USB flash memory device as JPEG B2900A Series of SMUs is fully com-
perform a variety of tests and save files, making it easy to include pliant with the LXI class C specifica-
measurement data without having to graphical results in reports and tion and it contains a web server that
write any code. presentations (please see Figure 3). provides a webpage with an interface
to support the basic measurement
The wide QVGA LCD display of the Ready-to-use PC software functions of the B2900A Series of
B2900A Series of SMUs supports an SMUs. You can quickly and easily
easy-to-use GUI that provides easy In addition to its powerful and make measurements using a standard
instrument control from the front easy-to-use GUI, the B2900A Series web browser by just connecting the
panel. The GUI of the B2900A Series of SMUs comes with free PC applica- B2900A Series of SMUs to a PC using
of SMUs has the following multiple tion software to facilitate program a LAN cable.
viewing modes: Single View, Dual development if you prefer PC-based
View, Graph View and Roll View (for instrument control. The Agilent
viewing time domain measurements).
Single View mode allows you to eas-
ily set up not only constant voltage
and current measurements but also
Measurement
swept voltage and current measure- Data
ments for a single SMU channel. Measurement
Setups
Dual View can perform similar func-
tions for both channels simultane-
ously (for B2902A and B2912A). After
measurement completion you can
use the front panel GUI to graphically Graph dump to JPEG
view measurement results such as IV
curves using Graph View, and display
a list of the measurement data using
the Measure Result dialog window
(please see Figure 2). Figure 3. Measurement results and the measurement setups can be saved to any
attached USB flash memory device
3
The Agilent B2900A Quick I/V Summary In addition to being able to control
Measurement Software has more the B2900A Series of SMUs remotely
powerful measurement capabilities The Agilent B2901/02/11/12A over GPIB, USB and LAN interfaces,
to control the B2900A Series of Precision Source/Measure Unit is Agilent supplies PC-based Agilent
SMUs over GPIB, USB or LAN the best solution for the LIV testing B2900A Graphical Web Interface
connections (please see Figure 4). of laser diodes. Its wide current and and Agilent B2900A Quick I/V
You can download this PC-based voltage measurement ranges (from Measurement Software for free to
software from Agilent's web site for 10 fA/100 nV to 10.5 A/210 V) provide simplify controlling the B2900A Series
free. The Agilent B2900A Quick I/V superior measurement performance of SMUs from your PC.
Measurement Software supports a and allow you to characterize devices
variety of functions such as a sweep more accurately and easily than ever For more detailed information on the
measurement, a sampling measure- before. various models of the B2900A Series
ment, graphical display functions of SMUs, please refer to the data
and the ability to save test results The easy-to-use GUI of the B2900A sheet of the B2900A Series of SMUs
into CSV files. The Agilent B2900A Series of SMUs has a variety of capa- (5990-7009EN).
Quick I/V Measurement Software bilities and features that make it easy
also allows you to control up to four to take measurements quickly and The B2900A Series of SMUs enables
SMU channels from B2900A Series to save both the measurement setup you to quickly debug and accurately
of SMUs so that devices requiring conditions and data to USB-based characterize a wide variety of devices
more than two SMU channels for flash memory devices. using only a single bench-top SMU.
characterization can be measured. In
addition, the Agilent B2900A Quick
I/V Measurement Software has the
capability to make not only primary
sweep measurements but also mea-
surements where a second terminal
is swept, making it easy to generate
a variety of IV curves.
1) Set the measurement condition for both channels
2) Perform the measurements
3) View the measurement results (Table)
3') View the measurement results (Graph)
Table
Graph
Figure 4. It is easy to make a quick measurement on a PC using the Agilent B2900A Quick I/V Measurement Software
4
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