Method and apparatus for tuning a bragg grating in a semiconductor substrate
First Claim
1. A method, comprising:
- directing an optical beam into a first end of an optical path having the first end and a second end disposed in a semiconductor substrate;
reflecting a first portion of the optical beam having a first center wavelength back out from the first end of the optical path with first and second pluralities of silicon and polysilicon interfaces, respectively, disposed in the semiconductor substrate along the optical path between the first end and the second end, the first and second pluralities of silicon and polysilicon interfaces oriented substantially perpendicular to the semiconductor substrate; and
tuning the optical path to reflect a second portion of the optical beam having a second center wavelength back out from the first end of the optical path.
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Abstract
A tunable Bragg grating method and apparatus. In one aspect of the present invention, a method according to an embodiment of the present invention includes directing an optical beam into a first end of an optical path having the first end and a second end disposed in a semiconductor substrate, reflecting a first portion of the optical beam having a first center wavelength back out from the first end of the optical path and tuning the optical path to reflect a second portion of the optical beam having a second center wavelength back out from the first end of the optical path. In one embodiment, the Bragg grating is tuned with a heater used to adjust a temperature of the semiconductor substrate. In another embodiment, charge in charge modulated regions along the optical path is modulated to tune the Bragg grating.
83 Citations
14 Claims
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1. A method, comprising:
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directing an optical beam into a first end of an optical path having the first end and a second end disposed in a semiconductor substrate; reflecting a first portion of the optical beam having a first center wavelength back out from the first end of the optical path with first and second pluralities of silicon and polysilicon interfaces, respectively, disposed in the semiconductor substrate along the optical path between the first end and the second end, the first and second pluralities of silicon and polysilicon interfaces oriented substantially perpendicular to the semiconductor substrate; and tuning the optical path to reflect a second portion of the optical beam having a second center wavelength back out from the first end of the optical path. - View Dependent Claims (2, 3, 4, 5)
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6. A method, comprising:
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directing an optical beam into a first end of an optical path having the first end and a second end disposed in a semiconductor substrate; reflecting a first portion of the optical beam having a first center wavelength back out from the first end of the optical path by perturbing an effective index of refraction a plurality of times along the optical path with a plurality of insulated conductor structures protruding into the optical path; and tuning the optical path to reflect a second portion of the optical beam having a second center wavelength back out from the first end of the optical path. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method, comprising:
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directing an optical beam into a first end of an optical path having the first end and a second end disposed in a semiconductor substrate; reflecting a first portion of the optical beam having a first center wavelength back out from the first end of the optical path with at least three silicon and polysilicon interfaces disposed in the semiconductor substrate along the optical path between the first end and the second end, the at least three silicon and polysilicon interfaces forming a Bragg grating; and tuning the at least three silicon and polysilicon interfaces to reflect a second portion of the optical beam having a second center wavelength back out from the first end of the optical path. - View Dependent Claims (13, 14)
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Specification