Optical waveguides – With optical coupler – Particular coupling structure
Patent
1998-08-05
2000-05-16
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Particular coupling structure
385 45, 385 14, 385 16, 385 22, G02B 626
Patent
active
060647876
ABSTRACT:
A digital optical switch includes an input waveguide connected to a Y-shaped branching waveguide having two legs, each of the legs being connected to an output waveguide. Each output waveguide forms one waveguide of a directional coupler, the other waveguide of which has its output dissipated into the substrate. Electrodes are connected to voltage sources such that the switch is operative between two states. In the first state, transmission of optical energy is enhanced between the input waveguide and the first output waveguide and inhibited between the input waveguide and the second output waveguide. Coupling between the first output waveguide and the other waveguide of its respective directional coupler is inhibited and coupling between the second output waveguide and the other waveguide of its respective directional coupler is enhanced. In the second state, transmission of optical energy is inhibited between the input waveguide and the first output waveguide and enhanced between the input waveguide and the second output waveguide. Coupling between the first output waveguide and the other waveguide of its respective directional coupler is enhanced and coupling between the second output waveguide and the other waveguide of its respective directional coupler is inhibited.
REFERENCES:
patent: 4070092 (1978-01-01), Burns
patent: 4243295 (1981-01-01), Alferness
patent: 4775207 (1988-10-01), Silberberg
patent: 4998791 (1991-03-01), Koai
patent: 5594818 (1997-01-01), Murphy
R.C. Alferness; Chap. 4 in "Guided-Wave Optoelectronics", T. Tamir (ed.), Springer-Verlag, Berlin, 1988, pp. 174-183.
W.K. Burns, et al.; "Active Branching Waveguide Modulator", Applied Physics Letters, vol. 29, No. 12, Dec. 15, 1976, pp. 790-792.
E.J. Murphy, et al.; "Enhanced Performance Switch Arrays for Optical Switching Networks", Proceedings of ECIO '97, Royal Institute of Technology, Sweden, Apr. 1997, pp. 563-566.
W.K. Burns; "Shaping the Digital Switch", IEEE Photonics Technology Letters, vol. 4, No. 8, Aug. 1992, pp. 861-863.
T. Findakly et al.; "Optical Directional Couplers with Variable Spacing", Applied Optics, vol. 17, No. 5, Mar. 1, 1978, pp. 769-773.
Palmer Phan T. H.
Pirelli Cavi E Sistemi S.p.A.
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