Electrooptic devices

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350 9612, G02B 514

Patent

active

043811388

ABSTRACT:
The response, as a function of frequency, of electrooptic mode converters using comb electrodes has been found to include several peaks at frequencies above and below the desired frequency. These spurious peaks appear to be caused by fringing of the electric field which effectively changes the spatial period of the electrode fingers. To prevent this unwanted coupling, channels have been etched between the comb fingers. The result is to confine the electric field to the narrow region between opposing electrode fingers, thereby minimizing the spurious responses. It also serves to reduce the magnitude of the applied voltage required to produce the same field strength.

REFERENCES:
patent: 3877782 (1975-04-01), Kamirow
patent: 4236785 (1980-12-01), Papuchon et al.
Alferness, "Efficient Waveguide Electro Optic Mode Converter", American Institute of Applied Physics Letters, 36 (7), 4/1980, pp. 513-515.

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