Guided-wave optical branching components and optical switches

Optical waveguides – With optical coupler – Particular coupling structure

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385 14, 385 16, G02B 626, G02B 612

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active

050447157

ABSTRACT:
A guided-wave optical branching component is composed of a Mach-Zehnder interferometer having two or more directional couplers. A slight difference .DELTA.L in the optical-path length is provided in two or more optical waveguides connecting the two or more directional couplers. The difference of the optical-path length is less than the shortest wavelength in the operational wavelength region of the guided-wave optical branching component, and the coupling ratio of each of the two directional couplers monotonically increases with wavelength in the operational wavelength region. By using the optical branching components thus constructed (i.e., Mach-Zehnder interferometer type 3-dB optical coupler) in conjunction with a phase shifter, a Mach-Zehnder interferometer type optical switch can be achieved.

REFERENCES:
patent: 4669816 (1987-06-01), Thompson
patent: 4768850 (1988-09-01), Moslehi et al.
patent: 4834481 (1989-05-01), Lawson et al.
patent: 4900112 (1990-02-01), Kawachi et al.
patent: 4900119 (1990-02-01), Hill et al.
patent: 4976512 (1990-12-01), Safaai-Jazi
patent: 4979790 (1990-12-01), Walker
Takato et al.-"Silica-Based Single-Mode Waveguides on Silicon and Their Application to Guided-Wave Optical Interferometers", Journal of Light Wave Technology vol. 6, No. 6, Jun. 1988.

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