Back to results
US 4,904,045 AGranted
Grating coupler with monolithically integrated quantum well index modulator
AssigneesAmerican Telephone and Telegraph Company, AT&T Bell Laboratories
InventorsRodney C. Alferness, Thomas L. Koch, Uziel Koren, Jane E. Zucker
Life of this patent
Estimating the term…
Abstract
A grating coupler is combined with a quantum well index modulator and an optical waveguide to alter the reverse or forward coupling characteristics between two different propagation modes of the system.
Claims9
A device comprising
- (a) a quantum well structure,
- (b) a guided wave structure, and
- (c) a grating coupler designed to couple at least two propagation modes of the guided wave structure,
- the invention characterized in that,
- the grating coupler has a pitch which yields phase matched grating coupling in a wavelength range which is energetically substantially below the absorption edge of the quantum well device.
2 more elements
Dependencies are inferred from the claim text.