Controllable directional coupler

Details Controllable directional coupler Controllable directional coupler

1985-04-16

1987-12-01

Laroche, Eugene R.

350 9613, G03B 610

Patent

active

047099771

ABSTRACT:
A controllable directional coupler comprises two optical waveguides on the surface of a substrate of electrooptical material, the waveguides extending parallel for a predetermined distance. The coupler also comprises a control electrode structure including a pair of control electrodes formed on the surface of the substrate and covering the two parallel waveguides along their lengths. In order to achieve low control voltage and a low coupling loss, in the case of butt coupling to a monomode fiber, in the interstice between the two optical waveguides, the refractive index of the substrate is reduced to a specific depth of the substrate at which the coupling intensity becomes largely independent of the near-field expansion in the waveguides.

REFERENCES:
patent: 3936144 (1976-02-01), Caton
patent: 4583817 (1986-04-01), Papuchon
Appl. Phys. Lett. 35(1), Jul. 1, 1979, Minakata "Efficient LiHbO.sub.3 Balanced Bridge Modulator/Switch with an Ion-Etched Slot", pp. 40-42.
Alferness et al. "Low Loss Fibre-Coupled Waveguide Directional Coupler Modulator", Electronics Letters, Jun. 10, 1982, vol. 18, No. 12, pp. 490-491.

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