Patent ID: 6542663
Filing Date: 2003-04-01
Classification: G02B

Abstract:
A device, comprising:a first substrate having a first elongated groove formed over a first substrate surface; a first fiber having a fiber coupling portion engaged in said first elongated groove, a portion of fiber cladding of said fiber coupling portion being removed to form a first side fiber surface spaced from a fiber core of said first fiber within a reach of an evanescent field of a guided mode in said first fiber; a second substrate having a second elongated groove formed over a second substrate surface, said second substrate facing said first substrate surface to align said second elongated groove with said first elongated groove; a second fiber having a fiber coupling portion engaged in said second elongated groove, a portion of fiber cladding of said fiber coupling portion being removed to form a second side fiber surface spaced from a fiber core of said second fiber and within a reach of an evanescent field of a guided mode in said second fiber, said second side fiber surface being within a reach of said evanescent field of said guided mode in said first fiber, wherein said fiber coupling portion in said first fiber has a fiber cladding portion whose radial index distribution is different from adjacent fiber portions to produce a radial mode profile wider than a radial mode profile of said adjacent fiber portions.