Patent ID: 6571035
Filing Date: 2003-05-27
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 portion engaged in said first elongated groove, a portion of fiber cladding of said fiber 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 portion engaged in said second elongated groove, a portion of fiber cladding of said fiber 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; and a coupling control layer formed between said first and said second substrate surfaces to have a thickness to allow for evanescent coupling between said first and said second fibers, said coupling control layer responsive to a control signal to change a coupling strength of said evanescent coupling.