Optoelectronic directional coupler for a bias-free control signa

Details Optoelectronic directional coupler for a bias-free control signa Optoelectronic directional coupler for a bias-free control signa

1987-04-22

1989-06-27

Lee, John D.

350 9615, G02B 626

Patent

active

048423670

ABSTRACT:
An optoelectronic directional coupler (1) has in a coupling area two parallel, coupled lightwave conductors (6a and 6b) with a length (L) as well as electrodes (5a and 5b). Each of the coupled lightwave conductors has one end connected to its individual output (7a and 7b) of the directional coupler (1). At their other ends the coupled lightwave conductors are each connected to its extra individual lightwave conductor (8a and 8b), the conductors (8a and 8b) being connected to the directional coupler input (9) via a fork branch. An incoming lightwave (P) is divided into two partial lightwaves (P1 and P2) by the extra wave conductors (8a and 8b). The partial lightwaves are in phase with each other and have the same effect in relation to each other at the inputs to the coupled lightwave conductors (6a and 6b). The partial lightwaves can be switched to either of the outputs (7aand 7b) with the aid of a control signal (S) connected between the electrodes (5a and 5b). The directional coupler has the advantage that the control signal (S) is a pure alternating voltage.

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