acceptably low when a conventional opto electronic coupler is used the cost may be unacceptably high because the opto electronic coupler is the most expensive part of the transceiver such a transceiver comprises one or more light emitting diodes leds and one or more photodiodes presently available bidirectional opto electronic couplers are unacceptably expensive for low cost automotive applications leds may be also expensive if their beam sizes are small as typically required for conventional couplers a low cost and effective solution for the opto electronic coupler is illustrated in fig7 this solution can offer virtually the same optical power as much more expensive couplers permits the use of individual low cost leds and individual low cost photodiodes the basis of the solution is the use of low cost borosilicate fiber bundles tapered or untapered into the diaphragm sensor as explained above and a divisional arrangement of the fibers at the opto electronic coupler end as shown in fig7 the fiber bundle 70 extending from the sensor is divided at the coupler end into dedicated subgroups for each opto electronic element for example eight fibers 72 extend to led 74 and another eight fibers 76 extend to led 78 sixteen fibers 80 extend to the photodiode in the measurement detector 82 three fibers 84 and 86 from each led 74 and 78 extend directly to the reference detector 88 with such an arrangement the light from the leds.