Patent ID: 8488923
Filing Date: 2013-07-16
Classification: G02B

Abstract:
1. An multi-mode optical coupler comprising: an input multi-mode waveguide to receive an optical signal from a single mode optical fiber; one or more single mode output waveguides optically coupled with the input multi-mode waveguide to form a single mode waveguide array, the one or more single mode output waveguides to receive the excited multiple modes caused by fiber misalignment, wherein the widths of the single mode output waveguides are adiabatically tapered in an increasing fashion to pull dispersions of the single mode waveguides toward a low frequency side and sweep the input frequencies to transfer optical power in the multimode waveguide into the single mode waveguide array adiabatically, wherein optical couplers to couple the one or more single mode output waveguides with the input multi-mode waveguide possess horizontal mirror symmetry to categorize the waveguide modes into either even or odd parity and the multi-mode waveguide can only interact with the single-mode waveguide array among modes with the same polarity to cause a subset of normal-mode splittings.