Low-loss integrated optical coupler and optical switch

Details Low-loss integrated optical coupler and optical switch Low-loss integrated optical coupler and optical switch

2005-07-26

2005-07-26

Lee, John R. (Department: 2881)

Optical waveguides

With optical coupler

Particular coupling structure

C385S030000, C385S037000

Reexamination Certificate

active

06922507

ABSTRACT:
A low-loss integrated optical coupler includes at least three substantially similar optical couplers, adjacent ones of the optical couplers interconnected via at least one set of waveguides, each of the sets of waveguides comprising a path-length difference between the waveguides therein. In one embodiment of the present invention, the multi-section optical coupler comprises at least two arms and the path-length differences are adjustable such that signals traversing the at least two arms undergo a relative phase shift, such that a desired output power splitting ratio for the multi-section optical coupler is achieved. Alternatively, the optical coupler is implemented in an inventive optical device that functions at least, as an optical switch or an optical splitter.

REFERENCES:
patent: 6501875 (2002-12-01), Zhao et al.
patent: 6556746 (2003-04-01), Zhao et al.
patent: 6597833 (2003-07-01), Pi et al.
“Mach-Zehnder Interferometer Type Optical Waveguide Coupler With Wavelength-Flattened Coupling Ratio,” K. Jinguji et al., Electronics Letters, Aug. 16, 1990, vol. 26, No. 17, pp. 1326-1327.
“Design Rules for Maximally Flat Wavelength-Insensitive Optical Power Dividers Using Mach-Zehnder Structures,” B. E. Little and T. Murphy, IEEE Photonics Technology Letters, vol. 9, No. 12, Dec. 1997, pp. 1607-1609.

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