Agilent 83440B Data Sheet

Digital Communications Analyzers

462 51.1

HP 11982A
HP 83430A
HP 83440B
HP 83440C
HP 83440D
HP 83446A

High-Speed DC-Coupled Lightwave Converter, Digital Source and Clock/Data Receiver

• DC-coupled optical-to-electrical converter

• Bandwidths from dc to 30 GHz

• Fast-pulse response

• Optical receiver for BERT or oscilloscope

• Clock and data recovery at 2488 Mb/s

• High sensitivity

HP 83440 Series

HP 11982A

DC-Coupled Optical Converter

Optical communication systems that incorporate time-domain instru­ments often require optical-to-electrical (O/E) converters in order to
make optical pulse and eye-diagram measurements. Whether to use an
unamplified or an amplified O/E converter depends on the measure­ment application. If signal power levels are high enough, a simple photo­diode-only converter such as the HP 83440 offers well-behaved pulse
response performance. To measure low power signals, an RF-amplified
O/E converter such as the HP 11982A may be required.

In frequency-domain applications, O/E converters allow frequen­cy-domain instruments such as network and spectrum analyzers to
accept optical signals for basic lightwave measurements. Users can
measure, quantify, and model modulation characteristics such as spec­tral purity, harmonic content, and noise spectral density.

11

HP 83440 Series Unamplified
Lightwave Converters

The HP 83440 series offers a variety of bandwidth options for conver t­ing incoming modulated optical power or optical pulses into electrical
current. Ideal for optical pulse parameter measurements, these fully­integrated hermetic InGaAs photodetectors feature very low noise and
pulse aberrations, fast, accurate O/E conversion, and a standard user­interface compatible with most electrical instruments. The converters
mount directly on test-instrument front panels. Simple internal struc­ture ensures low-signal distortion for improved output-signal fidelity, a
novel optical launch ensures low optical reflection, and integral dc-bias
regulation ensures stable frequency response per formance.

The HP 83440 series can be used with high-speed digitizing oscil­loscopes to accurately measure rise and fall time, overshoot, under­shoot, ringing, peak power (pulse amplitude), pulse width, amplitude
noise, and extinction ratio. The HP 83440 series also makes excellent
mask measurements when sufficient optical power is available.

The HP 83440B Option 050 provides 50 Ω output required for use
with external SDH Bessel-Thomson filters such as the HP 87441 family.

When using the HP 83440 with an ac-coupled instrument (except
Option 050), a bias tee such as the HP 11612A or, alternatively, a 3 dB
fixed attenuator on the output is required to provide a dc-bias retur n path.

HP 83446A

HP 11982A Amplified Wide Bandwidth
Lightwave Converter

A wide-bandwidth, sensitive O/E converter for characterizing lightwave
systems and components, the HP 11982A combines a PIN photodetector
with a low-noise dc-coupled preamplifier to create a general-purpose front
end. It covers wavelengths from 1200 to 1600 nm and bandwidths from dc
to 15 GHz. With 300 V/W conversion gain and 0.05 percent input optical
reflections, it significantly improves the sensitivity of the measurement
system. The converter comes with a calibration char t of instrument-spe­cific data for making corrected frequency-response measurements.

Combine the HP 11982A with an HP 83480 series digital commu­nications analyzer to make optical eye-pattern and impulse-response
measurements. Use the results to verify optical and optoelectronic com­ponents and optical system level performance.

The HP 11982A can be used with an electrical spectrum analyzer to
display optical modulation power as a function of frequency. Intensity mod­ulation, distortion, and laser intensity noise are also measur ed. The Option
001 memory card programs an HP 8590 E series spectrum analyzer with
frequency-response corrections, and menus for easy, accurate lightwave
measurements to 22 GHz. Using this converter with the HP 11980A inter­ferometer, you can measure linewidth (with a gateable modulation
source), chirp, and frequency modulation of single-line lasers.

HP 83430A Lightwave Digital Source and
HP 83446A Lightwave Clock/Data Receiver

With the HP 83430A and 83446A, Hewlett-Packard of fers complete optical
parametric test systems for test needs up to 2.5 Gb/s. A complete system
includes the HP 71603B error per formance analyzer as well and can per­form measurements, such as optical receiver sensitivity and dispersion
power penalty of single-mode fiber.

The HP 83430A is a modulatable DFB laser source that converts dig­ital input signals to a preset optical output level that is SDH/SONET com­pliant. It is designed to evaluate the performance of high-speed TDM
(time division multiplexed) and WDM (wavelength division multiplexed)
optical receivers and systems to SDH/SONET OC-1 (51.84 Mb/s)
through STM-16/OC-48 (2.488 Gb/s) standards. The HP 83430A can be
combined with the HP 83480A digital communications analyzer to provide
transceiver waveform testing, such as filtered conformance mask testing,
extinction-ratio and eye-diagram measurements.

The HP 83446A lightwave clock/data receiver is used to extract
clock and data signals from SDH/SONET optical signals operating at the
2488 Mb/s (STM-16/OC-48) rate. The HP 83446A operates over the full
range of power levels specified in SDH/SONET standards (–27 dBm sen­sitivity) at both 1300 nm and 1550 nm wavelengths, using multimode or
single-mode fiber. Designed for use with high-speed BERTs such as the
HP 71603B bit-error rate tester, BER testing can now be performed dir ect­ly on optical signals. A third port routes the high-gain avalanche photodi­ode output to the front panel, previous to clock/data regeneration for
analysis of the optical waveform. An electrical input allows clock and data
recovery from 2488 Mb/s.

For more complete information, order the Lightwave Test and

Measurement Catalog. See detailed description on page 603.