Optical waveguides – With optical coupler – Particular coupling structure
Reexamination Certificate
2005-12-20
2005-12-20
Lee, John D. (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling structure
C385S131000, C257S186000
Reexamination Certificate
active
06978067
ABSTRACT:
A horizontal access semiconductor photo detector (2) comprises a horizontal light absorbing layer (8) for converting light into photo-current which layer is configured to confine light within it in whispering gallery modes of propagation. The detector is configured to have a first waveguide portion (18) and a second light confining portion (20, 21) arranged such that the waveguide portion couples light into the detector and transfers light into the light confining portion so as to excite whispering gallery modes of propagation around the light confining portion. The light absorbing layer may be part of the light confining portion or alternatively light can be coupled into the light confining portion or alternatively light can be coupled into the light absorbing layer from the light confining portion by evanescent coupling. The excitation of whispering gallery modes within the light absorbing layer significantly increases the effective absorption coefficient of the light absorbing layer.
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Carline Roger T
Chidley Edward T R
Heaton John M
Herbert David C W
Leong Weng Y
Lee John D.
Nixon & Vanderhye P.C.
QinetiQ Limited
Stein James D.
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