FEATURES AND ADVANTAGES
- Matched InGaAs detectors
- DC to 125 MHz Analog Bandwidth
- Selectable Gain Settings
- Operates from Battery or Line Power
- Capability to drive 50 Ohm output loads
- Low Noise - 3.6 pW/root-Hz
- Coherent Heterodyne Detection
- Polarization-Shift-Keying Modulation
- Binary Differential Phase-Shift Keying (2-DPSK)
The TIA-527 balanced optical to electrical converter operates by subtracting
the photo currents from two well-matched Indium Gallium Arsenide detectors.
The result is then amplified and presented to the output port. Each of the optical
signals causes the output to move with a different sense. Common mode signals
(e.g. laser RIN noise) are effectively cancelled out.
With selectable gain settings and a bandwidth of DC to 125 MHz this receiver
is useful for coherent heterodyne detection applications, differential polarization
or phase shifted keying modulation systems, spectroscopy, and similar applications
for which the ability to discern small variations in signal strength in two
optical paths is critical.
Use of this converter can greatly simplify signal processing requirements downstream
from the experiment. Gains of 1400 V/W, 14 000 V/W and 140 000 V/W may be selected
as well as selectable AC inter-stage coupling.
The unit is designed to be conveniently mounted on an oscilloscope input BNC
connector and may be powered by its internal battery or with the universal wall-mount
supply that is provided with each unit. The unit is backed by a two year warranty.