INTRODUCTION
Ultrahigh-speed measurements are easy with the Models 141X,
143X, 144X and 145X high-speed photodetector modules. These
modules convert your optical signals to electronic signals, in effect,
giving every high-speed/high-frequency instrument in your lab
an optical input. The modules are connected directly to the test
instrument or amplifier, eliminating the need for coaxial cables fol-
lowing the photodetector which can seriously distort picosecond
pulses and attenuate microwave signals. The optical signal is
delivered to the Schottky photodiode in the module through a
single-mode or multi-mode optical fiber. Moreover, the photodi-
ode bias circuit and battery are self-contained, eliminating the
hassle of external power supplies and expensive bias networks
and reducing the possibility of photodiode damage due to over-
voltage.
New Focus offers a total of eight models, allowing you to match
your wavelength of interest and the connector style of your instru-
mentation. The Models 141X and 144X are high-speed InGaAs
photodetector modules for detection of light of wavelengths 950
to 1650 nm, and the Models 143X and 145X are also high-speed
InGaAs photodetectors designed for 400-1650 nm operation .
Models 141X and 143X are optimized for a flat frequency response,
and the Models 144X and 145X are optimized to achieve an
impulse response with minimal ringing. All models are 50-
Ω
termi-
nated to reduce reflections in 50-
Ω
systems and to make them
compatible with 50-
Ω
receiver filters. All detectors have single-
mode FC or ST fiber connectors, and an option (-50) is available for
a 50 µm core multimode fiber input. Each models‘ characteristics
are listed and their responsivity-vs.-wavelength curves are shown
in the Detector Characteristics section of this manual.
5
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
