Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2007-08-28
2007-08-28
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Input/output coupler
C385S001000, C385S031000, C385S039000, C385S129000
Reexamination Certificate
active
10291898
ABSTRACT:
A first embodiment of the invention provides a Gires-Tournois etalon (DGTE)20comprising a cladding mode suppressed optical fibre22, including an etalon section24in which a weakly reflective optical waveguide grating26and a strongly reflective optical waveguide grating28are provided. The two gratings26, 28are chirped fibre Bragg gratings (FBGs). The chirped FBGs26, 28are arranged to together define an etalon cavity. Another aspect of the invention provides a dispersion compensator60comprising two DGTEs62, 64according to the first embodiment of the invention. The DGTEs62, 64have a linearly varying dispersion over a selected optical bandwidth. The first DGTE62has a positive dispersion slope and the second DGTE64has a negative dispersion slope. The magnitudes of the dispersion slopes of the two DGTEs62, 64are substantially equal, so that the dispersion compensator60has a constant dispersion across the selected bandwidth. The DGTEs62, 64are optically coupled to one another via a four-port optical circulator66.
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Byron Kevin Christopher
Kennedy Lee Ann
Shu Xuewen
Sugden Catherine Anne
Aston University
Font Frank G.
Lepisto Ryan
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