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Title: Nonlinear optical coupler using a doped optical waveguide

An optical mode coupling apparatus includes an Erbium-doped optical waveguide in which an optical signal at a signal wavelength propagates in a first spatial propagation mode and a second spatial propagation mode of the waveguide. The optical signal propagating in the waveguide has a beat length. The coupling apparatus includes a pump source of perturbational light signal at a perturbational wavelength that propagates in the waveguide in the first spatial propagation mode. The perturbational signal has a sufficient intensity distribution in the waveguide that it causes a perturbation of the effective refractive index of the first spatial propagation mode of the waveguide in accordance with the optical Kerr effect. The perturbation of the effective refractive index of the first spatial propagation mode of the optical waveguide causes a change in the differential phase delay in the optical signal propagating in the first and second spatial propagation modes. The change in the differential phase delay is detected as a change in the intensity distribution between two lobes of the optical intensity distribution pattern of an output signal. The perturbational light signal can be selectively enabled and disabled to selectively change the intensity distribution in the two lobes of the optical intensitymore » distribution pattern.« less
Inventors:
 [1];  [2];  [3];  [2]
  1. (Menlo Park, CA)
  2. (Stanford, CA)
  3. (Palo Alto, CA)
Issue Date:
OSTI Identifier:
869295
Assignee:
Board of Trustees of Leland Stanford University (Stanford, CA) OAK
Patent Number(s):
US 5311525
Contract Number:
FG03-92ER12126
Research Org:
Stanford Univ., CA (United States)
Country of Publication:
United States
Language:
English
Subject:
nonlinear; optical; coupler; doped; waveguide; mode; coupling; apparatus; erbium-doped; signal; wavelength; propagates; spatial; propagation; propagating; beat; length; pump; source; perturbational; light; sufficient; intensity; distribution; causes; perturbation; effective; refractive; index; accordance; kerr; effect; change; differential; phase; delay; modes; detected; lobes; pattern; output; selectively; enabled; disabled; sufficient intensity; coupling apparatus; phase delay; propagation mode; output signal; refractive index; nonlinear optical; optical signal; optical waveguide; light signal; intensity distribution; optical wave; differential phase; pump source; nonlinear optic; signal wave; /372/385/