OPTICAL DISPERSION COMPENSATOR ON SILICON
First Claim
1. An optical dispersion compensator integrated with a silicon photonics system comprising:
- a first phase-shifter on a silicon substrate;
a second phase-shifter on the silicon substrate;
a first 2×
2 splitter having a first exit port coupled to an input port of the first phase-shifter and a second exit port coupled to an input port of the second phase-shifter;
a second 2×
2 splitter having a first entry port coupled to an output port of the first phase-shifter and a second entry port coupled to an output port of the second phase-shifter;
a third phase-shifter on the silicon substrate having an input port coupled to a first exit port of the second 2×
2 splitter and an output port coupled to a first entry port of the first 2×
2 splitter to form an optical loop with the first phase-shifter and the second phase-shifter;
wherein the second entry port of the first 2×
2 splitter is for coupling with an input fiber and the second exit port of the second 2×
2 splitter is for coupling with an output fiber, wherein the optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>
0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.
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Accused Products
Abstract
An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.
14 Citations
26 Claims
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1. An optical dispersion compensator integrated with a silicon photonics system comprising:
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a first phase-shifter on a silicon substrate; a second phase-shifter on the silicon substrate; a first 2×
2 splitter having a first exit port coupled to an input port of the first phase-shifter and a second exit port coupled to an input port of the second phase-shifter;a second 2×
2 splitter having a first entry port coupled to an output port of the first phase-shifter and a second entry port coupled to an output port of the second phase-shifter;a third phase-shifter on the silicon substrate having an input port coupled to a first exit port of the second 2×
2 splitter and an output port coupled to a first entry port of the first 2×
2 splitter to form an optical loop with the first phase-shifter and the second phase-shifter;wherein the second entry port of the first 2×
2 splitter is for coupling with an input fiber and the second exit port of the second 2×
2 splitter is for coupling with an output fiber, wherein the optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>
0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 24, 25)
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17. A method for compensating fiber dispersion in a compact device integrated in a system-on-chip, comprising:
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providing a silicon-on-insulator substrate; forming a first waveguide and a second waveguide embedded in a first cladding material on the silicon-on-insulator substrate, the first waveguide and the second waveguide optically coupled to each other in parallel and respectively coupled to a first 2×
2 coupler and a second 2×
2 coupler;forming a window of the first cladding material; forming third waveguide in the window, the third waveguide being surrounded by a second cladding material filled in the window, the third waveguide being coupled to a first entry port of the first 2×
2 coupler and a first exit port of the second 2×
2 coupler to form an optical loop with the first waveguide and the second waveguide;coupling a second entry port of the first 2×
2 coupler to an input fiber and a second exit port of the second 2×
2 coupler to an output fiber;wherein the optical loop is characterized by a total phase delay tunable via each of the first waveguide, the second waveguide, and the third waveguide such that a normal dispersion (>
0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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26. An optical dispersion compensator integrated with a silicon photonics system comprising multiple first optical dispersion compensators cascaded in series, each first optical dispersion compensator comprising a pair of first optical filters coupled in parallel in a main path between a first input port and a first output port and multiple optical filter units cascaded in parallel through one pair of 2×
- 2 couplers for each two adjacent optical filter units in a feedback path from the first output port to the first input port, each of the multiple optical filter units comprising a pair of second optical filters coupled in parallel forming a Mach-Zehnder Interferometer;
wherein each first input port of a next stage first optical dispersion compensator is coupled to the first output port of a current stage first optical dispersion compensator; wherein the pair of first optical filters is constrained under an athermal condition that a temperature variation of a first effective index of refraction multiplied by a first length of a first one of the pair of first optical filters therein cancels a temperature variation of a second effective index of refraction multiplied by a second length of a second one of the pair of first optical filters therein; wherein each Mach-Zehnder Interferometer is constrained under an athermal condition that a temperature variation of a first effective index of refraction multiplied by a first length of a first one of the pair of second optical filters therein cancels a temperature variation of a second effective index of refraction multiplied by a second length of a second one of the pair of second optical filters therein.
- 2 couplers for each two adjacent optical filter units in a feedback path from the first output port to the first input port, each of the multiple optical filter units comprising a pair of second optical filters coupled in parallel forming a Mach-Zehnder Interferometer;
Specification