High switching frequency optical waveguide switch, modulator, an

Details High switching frequency optical waveguide switch, modulator, an High switching frequency optical waveguide switch, modulator, an

1986-04-14

1987-07-14

Sikes, William L.

350 9613, G02B 610

Patent

active

046798935

ABSTRACT:
An optical device, capable of being variously optimized so as to have the characteristics of a switch, modulator, and filter, is disclosed. The device is obtained by providing first and second optical channel waveguides generally parallel one another at a surface of an electro-optic substrate, the waveguides being optically coupled in first and third regions of the device and essentially optically separated in an interposed second region, first, second, and third electrode sets being associated with the waveguides in the first, second, and third regions, respectively, the first and third electrode sets being biased so as to each transfer light of a given frequency bandwidth between the first and second waveguides, the second electrode set being biased so as to provide a relative phase difference between light present in each of the waveguides within the second region. This allows light entering the first region in the first waveguide to be partially transferred to the second waveguide in the first region, a relative phase shift to be introduced in the second region between the light in the first and second waveguides, the degree of relative phase shift being directly dependent on a signal applied to the second set of electrodes, and additional light to be transferred between the first and second waveguides in the third region, the direction and magnitude of the transfer being directly dependent on the relative phase shift between the light present in the first and second waveguides.

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C. M. Gee, et al, Applied Optics, vol. 22, No. 13, Jul. 1983 (New York, US): "Traveling-Wave Electrooptic Modulator", see pp. 2034-2037, in particular FIG. 1.
M. Izutsu, et al, IEEE Journal of Quantum Electronics, vol. QE-14, No. 6, Jun. 1978 (New York, US): 10 GH.sub.z bandwidth traveling-wave.
"LiNb03 Optical Waveguide Modulator", see pp. 394-395, in particular FIG. 1 (cited in the application).

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