Tektronix DSA8300 Service Manual page 30

Theory of Operation
80C01 Optical Sampling
Module
80C02 Optical Sampling
Module
2–8
The 80C01 module supports conformance testing of long wavelength
(1100-1650 nm) signals at 622, 2488, and 9953 Mb/s as well as general purpose
testing up to 20 GHz optical bandwidth. Bandwidth and reference receiver
calibration is performed with a sub-picosecond optical impulse and a Fourier
transform method.
OC12: The electrical sampler is adjusted to approximately 7.5 GHz (-3 dB)
bandwidth and signal is routed through a hardware filter designed to result in
the combined system having an OC12 (STM-4) Reference Receiver response.
OC48: The electrical sampler is adjusted to 7.5 GHz (-3 dB) 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.
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.
12.5 GHz: The sampler bandwidth and response is set during the calibration
such that the combined system will have an Optical Bandwidth (-6 dB)
>12.5 GHz.
20 GHz: The sampler bandwidth and response is set during the calibration
such that the combined system will have an Optical Bandwidth (-6 dB)
>20 GHz.
The 80C02 module is optimized for testing of long-wavelength (1100-1650 nm)
signals at (9.953 Gb/s) SONET OC-192 / SDH STM-64 standards. With its
high optical bandwidth (>30 GHz) it is also well suited to general purpose
high-performance optical component testing.
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.
12.5 GHz: The sampler bandwidth and response is set during the calibration
such that the combined system will have an Optical Bandwidth (-6 dB)
>12.5 GHz.
20 GHz: The sampler bandwidth and response is set during the calibration
such that the combined system will have an Optical Bandwidth (-6 dB)
>20 GHz.
30 GHz: The sampler bandwidth and response is set during the calibration
such that the combined system will have an Optical Bandwidth (-6 dB)
>30 GHz.
DSA8300 Digital Serial Analyzer and Modules Service Manual