INTRODUCTION
4
Ultrahigh-speed measurements are easy with the series 100X,
101X, and 102X ultrahigh-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
following the photodetector which can seriously distort picosec-
ond pulses and attenuate microwave signals. The optical signal
is delivered to the Schottky photodiode in the module through a
single-mode optical fiber. Moreover, the photodiode 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 overvoltage.
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 101X and 102X are high-speed InGaAs
photodetector modules for detection of light of wavelengths
950 to 1650 nm. Models 101X are optimized for a flat frequency
response, and the Models 102X are optimized for an impulse
response with minimal ringing. Both types are 50-
Ω
terminated to
reduce reflections in 50-
Ω
systems and to make them compatible
with 50-
Ω
receiver filters. The Models 100X are ultrahigh-speed
GaAs photodetector modules for detection of light of wavelengths
400 to 900 nm. These detectors offer at once both broadband and
minimal-ringing responses and are terminated in either 50-
Ω
or
100-
Ω
. All detectors are available with either FC or ST connectors
with single-mode input. Each models’ characteristics are listed and
their responsivity-vs.-wavelength curves are shown in the Detector
Characteristics section of this manual.
