METHOD AND SYSTEM FOR STABILIZED DIRECTIONAL COUPLERS
First Claim
1. A method for communication, the method comprising:
- in a system comprising first and second directional couplers formed by first and second waveguides, wherein one of said first and second waveguides comprises a length extender between said first and second directional couplers, and said first and second directional couplers are formed by reduced spacing between said first and second waveguides on opposite sides of said length extender;
communicating an input optical signal into one of said first and second waveguides;
coupling at least a portion of said input optical signal between said first and second waveguides in said first directional coupler and coupling at least a portion of the coupled optical signal between said first and second waveguides in said second directional coupler; and
communicating optical signals out of said system, wherein magnitudes of said optical signals communicated out of said system are at a desired percentage of said input optical signal.
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Abstract
Methods and systems for stabilized directional couplers are disclosed and may include a system comprising first and second directional couplers formed by first and second waveguides, where one of the waveguides may comprise a length extender between the directional couplers. The directional couplers may be formed by reduced spacing between the waveguides on opposite sides of the length extender. An input optical signal may be communicated into one of the waveguides, where at least a portion of the input optical signal may be coupled between the waveguides in the first directional coupler and at least a portion of the coupled optical signal may be coupled between the waveguides in the second directional coupler. Optical signals may be communicated out of the system with magnitudes at a desired percentage of the input optical signal. The length extender may add phase delay for signals in one of the first and second waveguides.
26 Citations
20 Claims
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1. A method for communication, the method comprising:
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in a system comprising first and second directional couplers formed by first and second waveguides, wherein one of said first and second waveguides comprises a length extender between said first and second directional couplers, and said first and second directional couplers are formed by reduced spacing between said first and second waveguides on opposite sides of said length extender; communicating an input optical signal into one of said first and second waveguides; coupling at least a portion of said input optical signal between said first and second waveguides in said first directional coupler and coupling at least a portion of the coupled optical signal between said first and second waveguides in said second directional coupler; and communicating optical signals out of said system, wherein magnitudes of said optical signals communicated out of said system are at a desired percentage of said input optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for communication, the system comprising:
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first and second directional couplers formed by first and second waveguides, wherein one of said first and second waveguides comprises a length extender between said first and second directional couplers, and said first and second directional couplers are formed by reduced spacing between said first and second waveguides on opposite sides of said length extender, said system being operable to; receive an input optical signal into one of said first and second waveguides; couple at least a portion of said input optical signal between said first and second waveguides in said first directional coupler and couple at least a portion of the coupled optical signal between said first and second waveguides in said second directional coupler; and communicate optical signals out of said system, wherein magnitudes of said optical signals communicated out of said system are at a desired percentage of said input optical signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for communication, the system comprising:
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a 1×
3 directional coupler comprising first and second directional couplers formed by first, second, and third waveguides, wherein said first waveguide comprises a first length extender and said third waveguide comprises a second length extender, said first and second length extenders being located between said first and second directional couplers, and wherein said first and second directional couplers are formed by reduced spacing between said first waveguide and said second waveguide and reduced spacing between said third waveguide and said second waveguide on opposite sides of said first and second length extenders, said directional coupler being operable to;receive an input optical signal into said second waveguides; couple at least a portion of said input optical signal between said second waveguide and said first waveguide in said first directional coupler and couple at least a portion of the coupled optical signal between said second waveguide and said third waveguide; couple at least a portion of said coupled optical signals in said first and third waveguides back to said second waveguide in said second directional coupler such that optical signals communicated out of said directional coupler are each ⅓
in magnitude of said input optical signal.
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Specification