Low RF emission fiber optic transmission system

Details Low RF emission fiber optic transmission system Low RF emission fiber optic transmission system

1987-05-21

1988-06-14

Tolin, G. P.

Electricity: electrical systems and devices

Miscellaneous

361414, 361415, H05K 704

Patent

active

047516135

ABSTRACT:
An electrical to fiber optic conversion unit for use in a fiber optic transmission link includes a ferrous metal chassis with an open front end for receiving a plurality of conversion modules and power supply or test modules. The conversion module includes circuitry for converting electrical signals to fiber optic signals and is constructed of a multi-layer printed circuit board having top and bottom layers substantially covered with a non-current conducting chassis ground. The several internal layers of the conversion PC board include two signal layers for interconnecting components on the board, with the signal layers being separated by a power distribution layer and an interconnect layer for connecting components on opposite ends of the board. The multi-layer PC construction suppresses RF noise from the conversion module providing that the front panel of the module may be left uncovered while still achieving very low levels of RF emission.

REFERENCES:
patent: 4399487 (1983-08-01), Neumann
patent: 4479263 (1984-10-01), Rosenfeldt
patent: 4631641 (1986-12-01), Brombal

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