Bilayer photonic adiabatic 2×2 splitter
AssigneeCisco Technology, Inc.
InventorsJean-Luc J. Tambasco, Dominic F. Siriani
Life of this patent
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Abstract
Adiabatic splitters are disclosed. In one aspect, an adiabatic splitter includes a first waveguide and a second waveguide spaced from the first waveguide by a gap. The second waveguide has a first layer and a second layer. In a first stage of the adiabatic splitter, the first and second waveguides converge toward one another and the first and second layers are in a stacked arrangement. In a second stage of the adiabatic splitter, the second layer tapers and translates so that the first and second layers are no longer in the stacked arrangement at least at an output of the adiabatic splitter.
Claims16
An adiabatic splitter, comprising:
- a first waveguide;
- and
- a second waveguide spaced from the first waveguide by a gap, the second waveguide has a first layer and a second layer,
- wherein, in a first stage of the adiabatic splitter, the first and second waveguides converge toward one another and the first and second layers of the second waveguide are in a stacked arrangement, and
- wherein, in a second stage of the adiabatic splitter, the second layer of the second waveguide tapers and translates so that the first and second layers of the second waveguide are, at least at an output of the adiabatic splitter, no longer in the stacked arrangement, and wherein the second layer of the second waveguide translates toward a center of the adiabatic splitter along the second stage.
A crossover adiabatic splitter, comprising:
- a first region;
- a second region;
- a first waveguide traversing through the first region and the second region;
- and
- a second waveguide traversing through the first region and the second region, and wherein:
- i) in the first region, the first waveguide has a first layer and the second waveguide has a first layer and a second layer, the first waveguide and the second waveguide converge toward one another over a first stage of the first region and the second layer and the first layer of the second waveguide traverse through the first stage in a stacked arrangement, and in a second stage of the first region, the second layer of the second waveguide tapers and translates toward a center of the crossover adiabatic splitter, and
- ii) in the second region, the second layer of the second waveguide inverse tapers and translates over a third stage of the second region, and in a fourth stage of the second region, the first layer of the first waveguide and the first layer of the second waveguide diverge from one another and the second layer of the second waveguide and the first layer of the first waveguide traverse through the fourth stage in a stacked arrangement.
An adiabatic splitter, comprising:
- a first waveguide;
- and
- a second waveguide spaced laterally from the first waveguide by a gap, the second waveguide has a first layer and a second layer,
- with the first and second layers of the second waveguide in a vertically stacked arrangement, the first and second waveguides laterally converge toward one another over a first portion of a longitudinal length of the adiabatic splitter, and
- over a second portion of the longitudinal length of the adiabatic splitter, the second layer of the second waveguide tapers in width and translates toward a center of the adiabatic splitter so as to laterally cross an inner edge of the first layer of the second waveguide.
Dependencies are inferred from the claim text.