.DELTA..beta.-Phase reversal coupled waveguide interferometer

Details .DELTA..beta.-Phase reversal coupled waveguide interferometer .DELTA..beta.-Phase reversal coupled waveguide interferometer

1987-08-13

1988-08-16

Lee, John D.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350355, 356345, G01B 902

Patent

active

047639741

ABSTRACT:
An improved electro-optic coupled waveguide interferometer (50) is provided. The device comprises a single input (52), a Y-junction splitter (54), two interferometric arms (56a, 56b), a Y-junction combiner (58), a single output (60) and multiple equal-length sections of electrodes (62a-d) with alternating applied voltage polarities. The device of the invention permits use of much smaller Y-junction branching angle, which reduces scattering losses, or a shorter branching waveguide section, which allows construction of a device having an overall shorter length than prior art interferometers. The device takes advantage of a close placement of the interferometer arms, which results in a transfer of optical energy and facilitates a single-gap electrode structure for efficient push-pull operation. The use of multiple-section electrodes restores the high modulation depth otherwise destroyed by the close placement of the interferometric arms.

REFERENCES:
patent: 4291939 (1981-09-01), Gallorenzi et al.
patent: 4553810 (1985-11-01), Alferness et al.
Burns et al., "Interferometric Waveguide Modulator with Polarization-Independent Operation", Applied Physics Letters, vol. 33, No. 11, Dec. 1978, pp. 944-947.
Bulmer et al., "Linear Interferometric Waveguide Modulator for Electromagnetic-Field Detection", Optics Letters, vol. 5, No. 5, May 1980, pp. 176-178.
Bulmer et al. II, "Linear Interferometric Modulators in Ti:LiNbO.sub.3 ", Journal of Lightwave Technology, vol. LT-2, No. 4, Aug. 1984, pp. 512-521.

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