Since 1991 we have been supplying the world with test and measurement equipment. At Pico we realize that your choice of test accessories can be almost as important as your choice of test equipment. Here you can purchase a variety of test and measurement accessories quickly and securely online.

Bessel-Thomson reference filter 622 Mb/s

A range of Bessel-Thomson (BT) filters is available for standard bit rates. These filters are essential for accurate characterization of signals emerging from an optical transmission system. Connecting a BT filter between the output of the optical to electrical (O/E) converter and the scope input ensures an accurate representation of the signal that an equalized optical receiver would see, enabling the PicoScope 9221A, 9231A and PicoScope 9321 to display correct measurements.

Choosing the correct BT filter for the application is simple using the table below with common bit rates and their associated serial data or communication standard.

Bessel-Thomson filter Bit rates (serial data standard)
TA120 51.8 Mb/s  (OC1/STM0)
TA121 155 Mb/s  (OC3/STM1)
TA122 622 Mb/s  (OC12/STM4)
TA123 1.250 Gb/s  (GBE)
TA124 2.488 Gb/s  (OC48/STM16) /
2.500 Gb/s  (Infiniband 2.5G)
Bessel-Thomson reference filter
Available for back order. More stock coming soon.