| US 7,542,630 B2 | ||
| High speed optical phase modulator | ||
| Dawei Zheng, Alhambra, Calif. (US); Dazeng Feng, Arcadia, Calif. (US); Anthony Kewitsch, Santa Monica, Calif. (US); and George Rakuljic, Santa Monica, Calif. (US) | ||
| Assigned to Kotura, Inc., Monterey Park, Calif. (US) | ||
| Filed on May 21, 2008, as Appl. No. 12/154,435. | ||
| Application 12/154435 is a continuation of application No. 11/147403, filed on Jun. 07, 2005, granted, now 7,394,949. | ||
| Application 11/147403 is a continuation of application No. 11/146898, filed on Jun. 07, 2005, granted, now 7,394,948. | ||
| Claims priority of provisional application 60/605589, filed on Aug. 30, 2004. | ||
| Claims priority of provisional application 60/577636, filed on Jun. 07, 2004. | ||
| Prior Publication US 2008/0253711 A1, Oct. 16, 2008 | ||
| Int. Cl. G02F 1/35 (2006.01); G02B 6/26 (2006.01); G02B 6/42 (2006.01) | ||
| U.S. Cl. 385—3 [385/2; 385/40] | 20 Claims |
| 1. An optical device, comprising:
a phase modulator that includes a waveguide on a substrate, the waveguide having a light signal carrying region;
an n-type region having a proximity to a p-type region that causes a depletion region to form when a bias is not applied to
the modulator, the depletion region being at least partially positioned in the light signal carrying region of the waveguide;
and
the phase modulator includes a plurality of sub-modulators connected to a transmission line configured to carry a bias signal
to each of the sub-modulators,
the sub-modulators being spaced apart from one another along a length of the waveguide,
the length of the sub-modulators along the waveguide and the spacing between the sub-modulators being selected such that the
average speed of the bias signal through the transmission line is about the same as the average speed of a light signal traveling
through the phase modulator.
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