Polarization-independent optical directional coupler switch/modu

Details Polarization-independent optical directional coupler switch/modu Polarization-independent optical directional coupler switch/modu

1979-09-19

1981-01-06

Corbin, John K.

350355, G02B 514, G02F 1137

Patent

active

042432952

ABSTRACT:
Because orthogonally polarized optical waves see unequal electrooptic coefficients and refractive indices for the same applied voltage, it has been difficult to obtain efficient switching of arbitrarily polarized waves. This difficulty is resolved in a reverse .DELTA..beta. directional coupler (10, 11) which employs spatial tapering of the distance between waveguides (D(z)) for efficient through-coupling, and the appropriate choice of effective coupling strengths (s.sub.TE, s.sub.TM) for the two polarizations for efficient cross-coupling.

REFERENCES:
patent: 3874782 (1975-04-01), Schmidt
patent: 4012113 (1977-03-01), Kogelnik et al.
patent: 4157860 (1979-06-01), Marcatili
Steinberg et al., "Performance Limitations Imposed on Optical Waveguide Switches . . .," Appl. Optics, vol. 15, No. 10, Oct. 1976, pp. 2440-2453.
Kogelik et al., "Switched Directional Couplers With . . .," IEEE J.Q.E., vol. QE-12, No. 7, Jul. 1976, pp. 396-401.
Steinberg et al., "Polarization-Insensitive Integrated-Optical Switches: A New . . .," Appl. Optics, vol. 16, No. 8, Aug. 1977, pp. 2166-2170.
Alferness et al., "Filter Characteristics of Codirectionally Coupled . . .," IEEE J.Q.E., vol. QE-14, No. 11, Nov. 1978, pp. 843-847.
Burns et al., "Interferometric Waveguide Modulator With . . .," Appl. Phys. Lett., vol. 33, No. 11, Dec. 1978, pp. 944-947.
Alferness, "Optical Directional Couplers with Weighted Coupling," Appl. Phys. Lett., vol. 35, No. 3, Aug. 1979, pp. 260-262.

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