| US 7,593,606 B2 | ||
| Optical modulator including waveguide grating structure and multiple quantum well layer | ||
| David Fattal, Mountain View, Calif. (US); Michael M. Sigalas, Mountain View, Calif. (US); and Shih-Yuan Wang, Palo Alto, Calif. (US) | ||
| Assigned to Hewlett-Packard Development Company, L.P., Houston, Tex. (US) | ||
| Filed on Jul. 30, 2007, as Appl. No. 11/888,032. | ||
| Prior Publication US 2009/0034899 A1, Feb. 05, 2009 | ||
| Int. Cl. G02F 1/035 (2006.01) | ||
| U.S. Cl. 385—2 [372/102; 385/27; 385/37] | 20 Claims |
| 1. An optical modulator, comprising:
a horizontal waveguide grating structure (WGS) receiving an incident radiation beam propagating in a non-horizontal direction,
the WGS including a horizontal waveguiding layer along which a lateral propagation mode is guided, the lateral propagation
mode having a vertically extending mode profile; and
a multiple quantum well (MQW) layer sufficiently proximal to said horizontal waveguiding layer to be within a vertical extent
of said mode profile of said lateral propagation mode; and
an electric field source applying a time-varying electric field to said MQW layer;
wherein said optical modulator modulates said incident radiation beam according to said time-varying electric field, to generate
a modulated radiation beam propagating in one of a transmitted direction and a reflected direction.
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