Arrayed waveguide grating with reduced channel passband...

Details Arrayed waveguide grating with reduced channel passband... Arrayed waveguide grating with reduced channel passband...

2007-04-19

2009-02-17

Wood, Kevin S (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S129000

Reexamination Certificate

active

07492991

ABSTRACT:
Roughly described, arrayed waveguide grating apparatus includes one or more input and/or output waveguides which are shaped and oriented such that optical energy communicated with the waveguide array is, within a distance of no more than 1 mm into the mouth of the waveguide, directed substantially in-line with the optical centerline of the waveguide. In one embodiment, the waveguides are shaped and oriented such that the optical energy enters or exits the waveguide substantially-line with the optical centerline of each waveguide. In another embodiment the waveguides are shaped and oriented such that optical energy is, at the mouth of each waveguide, directed off-axis, and the waveguide includes mode conversion means such that optical energy is directed substantially in-line with the optical centerline within a distance of no more than 1 mm into the mouth of the waveguide. The mode conversion means may, for example, include a non-adiabatic lateral optical centerline shift.

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