Dispersion compensating module and mode converter, coupler and dispersion compensating optical waveguide therein
June 12, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesWavelength selective mode couplers Apparatus for compensating chromatic dispersion in optical fibers Chromatic dispersion compensated optical fiber communication system Fiber amplifier coupler Fiber-optic transmission polarization-dependent distortion compensation Low-loss dual-mode optical fiber compensators Environmentally robust fiber optic coupler and method Optical fiber spatial mode converter using periodic core deformation Article comprising a dispersion-compensating optical waveguide Increased capacity optical waveguide InventorsAssigneeApplicationNo. 10/171316 filed on 06/12/2002US Classes:385/39, Particular coupling structure385/28, Coupling between modes in a waveguide or fiber385/37, Grating385/45"Y" couplerExaminersPrimary: Sanghavi, HemangAssistant: Rojas, Omar Attorney, Agent or FirmInternational ClassesG02B 6/34 (20060101)G02B 6/14 (20060101) AbstractA dispersion compensating module, mode converter, coupler and dispersion compensated optical fiber therein. The dispersion compensating fiber has a plurality of core segments, the refractive index profile being selected to exhibit properties such that an LP02 mode at 1550 nm may be propagated a distance (generally 0.5-3.0 km), upon conversion to LP02, to compensate for dispersion of a length of transmission waveguide preferably greater than 25 km propagating in an LP01 mode. In another embodiment, the dispersion compensating module has a mode converter having a reflective fiber grating for converting a first to a second mode interconnected to a dispersion compensated fiber propagating in the second mode. The mode converter has a coupler adapted to operatively couple light propagating in a first mode from a first fiber into a second, and a reflective fiber grating operatively coupled to the second fiber; the grating being capable of converting light from the first into the second mode. According to another embodiment, an optical fiber coupler is provided having a first fiber with a first propagation constant in a first mode, and a second fiber within the coupler having a second propagation constant, the second fiber including a necked-down portion which is formed prior to fusion of the fibers, the necked-down portion being formed such that the local propagation constant of the second fiber substantially matches the first propagation constant thereby enhancing first mode coupling.Other References
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