Theory of Operation
3–6
CSA8000 & TDS8000 Instruments and Sampling Modules
offset is measured for all gain settings and stored so it can be subtracted from the
raw measured current. Because the measurements are made through independent
paths the power monitor is useful in debugging module/mainframe problems.
The module’s main board only provides power and control bits to the clock
recovery board. A small fraction of the input signal is split off to applied to the
clock recovery components. The splitter is optical in the 80C01-CR and
80C02-CR, and is electrical in the 80C03-CR. The recovered clock is routed in
coaxial cable through the rear connector to the module to the Optical Front End
board in the mainframe. The Optical Front End board has a switch that selects
which modules clock will be applied to the trigger. The control signal for that
switch comes from the optical module.
The 80C01 module supports conformance testing of long wavelength (1100-1650
nm) signals at 622, 2488, and 9953 Mbps as well as general purpose testing up
to 20 GHz optical bandwidth. Bandwidth and reference receiver calibration is
performed with a sub-picosecond and optical impulse and a fourier transform
method.
H
OC12: The electrical sampler is adjusted to approximately 7.5 GHz
(–3dB) bandwidth and signal is routed through a hardware filter
designed to result in the combined system having an OC12 (STM-4)
Reference Receiver response.
H
OC48: The electrical sampler is adjusted to 7.5 GHz (–3dB) bandwidth
and signal is routed through a hardware filter designed to result in the
combined system having an OC48 (STM-16) Reference Receiver
response. These adjustments must be made at the factory.
H
OC192: The electrical sampler is adjusted to give the desired response,
and signal is not routed through any filter (signal is sent through the
straight-through path). The sampler bandwidth and response is optimized
during the calibration such that the combined system will have an
OC192 (STM-64) Reference Receiver response.
H
12.5 GHz: The sampler bandwidth and response is set during the
calibration such that the combined system will have an Optical
Bandwidth (–6dB) > 12.5 GHz.
H
20 GHz: The sampler bandwidth and response is set during the
calibration such that the combined system will have an Optical
Bandwidth (–6dB) > 20 GHz.
For major functional circuit blocks refer to (Figure 9–5 on page 9–5).
80C01 Optical Sampling
Module
Содержание CSA8000 Series
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