Waveguide type optical branching device

Details Waveguide type optical branching device Waveguide type optical branching device

2007-09-18

2007-09-18

Leung, Quyen P (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C385S039000, C385S045000

Reexamination Certificate

active

11580832

ABSTRACT:
A waveguide type optical branching device having: two input ports; two output ports; optical waveguides extending from the input ports and the output ports respectively; and a coupling portion formed allowing the optical waveguides from the input ports and the output ports to gradually approach each other in a direction toward the output ports. The device is operable such that, in a direction from the input ports to an output end of the coupling portion, when light is inputted to one input port of the two input ports, an even more is predominantly excited, and when light is inputted to the other input port of the two input ports, an odd mode is predominantly excited. The optical waveguides in the coupling portion have a core width that is larger at a middle position in a height direction thereof than at an upper surface of the core.

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Y. Shani et al., “Integrated Optic Adiabatic Devices on Silicon,” IEEE Journal of Quantum Electronics, vol. 27, No. 3, Mar. 1991, pp. 556-566.
M. Izutsu et al., “Optical-waveguide hybrid coupler,” Optics Letters, vol. 7, No. 11, Nov. 1982, pp. 549-551.

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